Omicron Lab CT Analyzer, CT SB2 User Manual

CT Analyzer & CT SB2

User Manual

CT Analyzer & CT SB2 User Manual

Manual Version: CTAnalyzer+CTSB2UM.AE.3

© OMICRON electronics GmbH 2012. All rights reserved.

This manual is a publication of OMICRON electronics GmbH.

All rights including translation reserved. Reproduction of any kind, for example, photocopying, microfilming, optical character recognition and/or storage in electronic data processing systems, requires the explicit consent of OMICRON electronics GmbH. Reprinting, wholly or in part, is not permitted.

The product information, specifications, and technical data embodied in this manual represent the technical status at the time of writing and are subject to change without prior notice.

We have done our best to ensure that the information given in this manual is useful, accurate and entirely reliable. However, OMICRON electronics GmbH does not assume responsibility for any inaccuracies which may be present.

The user is responsible for every application that makes use of an OMICRON product.

OMICRON electronics GmbH translates this manual from the source language English into a number of other languages. Any translation of this manual is done for local requirements, and in the event of a dispute between the English and a non-English version, the English version of this manual shall govern.

CT Analyzer

User Manual

CT Analyzer User Manual

2

Manual Version: CTAnalyzerUM.AE.3

Contents

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operator Qualifications and Safety Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Conventions and Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

General Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Orderly Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

1.1

Designated Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.2

Functional Components of the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.1

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.2

Mains Connection Unit and Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.2.3

Compact Flash Card Slot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.2.4

Remote Control Interface (PC Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1.2.5

Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1.2.6

I/0 Key with Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1.2.7

Display with Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1.2.8

Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1.3

License-Depending Functional Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

1.4

Scope of Delivery, Accessories, Available Licenses . . . . . . . . . . . . . . . . . . . . . 20

2 Setup and Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

2.1

General Safety Rules for Connecting and Operating the CT Analyzer . . . . . . . 21

2.2

Setting Up the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.3

Connecting the CT Analyzer to a PC (optional) . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.4

Connection for Usual Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.4.1

Wiring for a CT Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.4.2

Wiring for a Burden Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.4.3

Wiring for Primary Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.5

Connection for Special Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.5.1

Measurement on a Gapped Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.5.2

Excitation Curve Measurement for an Unwound Iron Core . . . . . . . . . . . . . . . 29

2.5.3

Measurement on a GIS (SF6) Switch Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.5.4

Measurement on Bushing-Type CTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.5.5

VT Ratio Measurement Using QuickTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3


4

2.5.6

VT Winding Resistance Measurement Using QuickTest . . . . . . . . . . . . . . . . . 39

2.5.7

Polarity Check Using QuickTest and the CPOL Polarity Checker . . . . . . . . . . 39

2.6

Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

2.7

Improving the Quality of Measurement Results. . . . . . . . . . . . . . . . . . . . . . . . . 42

2.7.1

4-Wire Measurement vs. 2-Wire Measurement . . . . . . . . . . . . . . . . . . . . . . . . 42

2.7.2

Noise Reduction Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3 Short Guide for Running a CT Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4 Running a CT Test (Detailed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.1

Setting Up the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

4.2

Preparing and Configuring the Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

4.3

Running the Automatic Test and Connecting the CT Analyzer . . . . . . . . . . . . . 52

4.4

After the Test is Finished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4.5

Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

5 Operating and Configuring the CT Analyzer. . . . . . . . . . . . . . . . . . . . . . . . 59

5.1

Working in the User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5.1.1

Displaying a Specific Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5.1.2

Using the Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5.1.3

Editing a Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

5.2

The Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

5.3

New CT-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.4

New MR-Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.5

New Quick-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.6

File Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.6.1

Available Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.6.2

Working in the File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

5.7

Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.7.1

Available Options in the Settings Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.7.2

Default Test Card Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.7.3

Miscellaneous Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

5.8

Tools (Update Functions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.8.1

Available Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.8.2

Update Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.8.3

Update Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.9

CT Analyzer Help System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.10 Operating the CT Analyzer from a Computer . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6 The CT Analyzer Test Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.1

Overview of Test Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.2

CT-Object Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Contents

6.2.1

Available Soft Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

6.2.2

Information Fields to be Filled by the User . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

6.2.3

Parameters and Settings Used or Determined by the Test Process . . . . . . . . 82

6.3

Burden Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

6.3.1

Test Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

6.3.2

Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

6.3.3

Connecting the Burden and Running the Burden Test . . . . . . . . . . . . . . . . . . 101

6.4

Residual Magnetism Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

6.4.1

Test Settings and Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

6.4.2

Running a Residual Magnetism Measurement. . . . . . . . . . . . . . . . . . . . . . . . 103

6.5

Resistance Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

6.5.1

Primary Winding Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 106

6.5.2

Secondary Winding Resistance Measurement. . . . . . . . . . . . . . . . . . . . . . . . 106

6.5.3

Test Settings and Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

6.6

Excitation Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

6.6.1

Available Soft Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

6.6.2

Test Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

6.6.3

Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

6.6.4

Excitation Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

6.6.5

Accuracy Limiting Error Graph* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

6.7

Ratio Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

6.7.1

Available Soft Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

6.7.2

Test Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

6.7.3

Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

6.7.4

Ratio Table and Phase Table for IEC 60044-1, IEC 60044-6 and

IEC 61869-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

6.7.5

Ratio Table and Phase Table for IEEE C57.13 . . . . . . . . . . . . . . . . . . . . . . . 123

6.8

Assessment Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

6.8.1

Assessed Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

6.9

Comment Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

7 CT Testing Using the Guesser Function . . . . . . . . . . . . . . . . . . . . . . . . . .131

7.1

About the Guesser Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

7.2

Setting Up and Connecting the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . 132

7.3

Preparing and Configuring the Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

7.4

Running the Automatic Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

7.5

After the Test is Finished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

7.6

Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

8 Using the Quick Test Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135

8.1

Safety Notes and Notes for Using Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . 136

5

6


8.2

Introduction to Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

8.3

Performing Measurements with Quick Test. . . . . . . . . . . . . . . . . . . . . . . . . . . 139

8.4

Advanced Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

8.5

Polarity Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

8.6

CT Ratio Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

8.7

VT Ratio Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

8.8

Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

8.9

Impedance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

8.10 Reactance Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

9 CT Analyzer PC Toolset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

9.1

System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

9.2

Installing the CT Analyzer PC Toolset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

9.3

The CTA Start Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

10 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

10.1 Mains Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

10.2 Generator Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

10.3 Measurement Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

10.4 Winding Resistance Measurement Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . 164

10.5 Ratio and Phase Measurement Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

10.6 Compact Flash Card Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

10.7 Remote Control Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

10.7.1 RS232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

10.7.2 USB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

10.8 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

10.8.1 Climate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

10.8.2 Shock and Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

10.8.3 Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

10.8.4 Safety Standards, Electromagnetic Compatibility (EMC) . . . . . . . . . . . . . . . . 168

11 User Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

11.1 Care and Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

11.2 Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

11.3 Calibrating the CT Analyzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

12 Error and Warning Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

OMICRON Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Preface

Preface

Using This Manual

This User Manual provides information on how to use the

CT Analyzer

. The

CT Analyzer User Manual contains important safety instructions for working with the

CT Analyzer

and gets you familiar with operating the

CT Analyzer

. Read and

observe the safety rules described in "Safety Rules" on page 9 and all relevant

installation and operation instructions. Following the instructions in this User

Manual will help you to prevent danger, repair costs, and avoid possible down time due to incorrect operation.

The CT Analyzer User Manual always has to be available at the site where the

CT Analyzer

is used. It must be read and observed by all users of the

CT Analyzer

. Reading the CT Analyzer User Manual alone does not release you from the duty to comply with all relevant national and international safety regulations.

Operator Qualifications and Safety Standards

Working on high-voltage power equipment can be extremely dangerous.

Testing with the

CT Analyzer

should only be carried out by authorized and qualified personnel. Before starting to work, clearly establish the responsibilities.

Personnel receiving training, instruction, direction, or education on the

CT Analyzer

should remain under the constant supervision of an experienced operator while working with the equipment.

Testing with the

CT Analyzer

must comply with the internal safety instructions as well as additional relevant documents.

In addition, observe the following safety standards, if applicable:

• EN 50191 (VDE 0104) "Erection and Operation of Electrical Equipment"

• EN 50110-1 (VDE 0105 Part 100) "Operation of Electrical Installations"

• IEEE 510 "IEEE Recommended Practices for Safety in High-Voltage and

High-Power Testing"

7

8


Conventions and Symbols Used

In this manual, the following symbols indicate paragraphs with special safety relevant meaning:

Symbol Description

Caution:

Equipment damage or loss of data possible

Warning:

Risk of electric shock!

Personal injury or severe damage to objects possible

Related Documents

The following documents complete the information covered in the CT Analyzer

User Manual:

Title

CT SB2 User Manual

Help System for

CT Analyzer PC Toolset

Description

Contains information how to use and operate the optional

CT SB2

switch box for multi-ratio CT measurement with the

CT Analyzer

as well as safety instructions for working with the

CT SB2

.

Contains detailed information about the software tools provided with the


.

Safety Rules

Safety Rules

Before operating the

CT Analyzer

, read the instructions in this section carefully.

If you do not understand some safety rules, contact OMICRON before proceeding. When working with the

CT Analyzer

, observe the following safety rules.

Maintenance and repair is only permitted by qualified experts at OMICRON repair centers.

General Rules for Safe Operation

• Always observe the five safety rules:

– Disconnect completely

– Secure from reconnection

– Verify that the installation is dead

– Carry out grounding and short-circuiting

– Provide protection against adjacent live parts

• Do not touch any terminals without a visible connection to ground.

• Always be aware of the danger of the high voltages and currents associated with this equipment. Pay attention to the information provided in this user manual.

• Use the

CT Analyzer

and its accessories only in a technically sound condition and when its use is in accordance with the safety regulations for the specific job site and application.

• Use only original accessories available from OMICRON.

• If the

CT Analyzer

or any add-on device or accessory seems to be functioning improperly, please call the OMICRON Hotline (refer to

chapter "OMICRON Service Centers" on page 185).

• Do not operate the

CT Analyzer

when explosive gas or vapors are present.


CT Analyzer

under wet or moist conditions

(condensation).

• Do not open the

CT Analyzer

. Opening the

CT Analyzer

invalidates all warranty claims. Do not repair, modify, extend, or adapt the

CT Analyzer

or any accessories.

• Do not insert objects (e.g. screwdrivers, etc.) into the ventilation slots or any input/output sockets.

9

10


• Do not stand right next to or directly underneath a connection point because the clamps may fall off and touch you.

• Full compliance with the regulations also includes following the instructions provided in this User Manual.

Orderly Measures

The CT Analyzer User Manual or the e-book version of the manual has always to be available on the site where the

CT Analyzer

is being used. All users of the

CT Analyzer

must read and observe the safety rules described in this section and all relevant installation and operation instructions.

The

CT Analyzer

may be used only as described in this User Manual. Any other use is not in accordance with the regulations. The manufacturer and the distributor are not liable for damage resulting from improper usage. The user alone assumes all responsibility and risk.

Disclaimer

If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

Introduction

1

1.1

Introduction

Designated Use

The

CT Analyzer

is intended to perform automatic testing and calibration of low leakage flux current transformers (i.e., CTs with non-gapped cores) in laboratories as well as on-site in utilities. Testing of CTs with gapped cores is also possible with restricted accuracy. The following tests can be performed using the

CT Analyzer

:

• Burden measurement

• Residual magnetism measurement of CTs

• CT winding resistance measurement

• CT excitation characteristic measurement according to IEC 61869-2,

IEC 60044-1, IEC 60044-6 (TPS, TPX, TPY, TPZ) and IEEE C57.13.

• CT ratio measurement with consideration of a connected burden

• CT phase and polarity measurement

• Determination of accuracy limiting factor, instrument security factor, secondary time constant, symmetrical short-circuit current factor, transient dimensioning factor, remanence factor, knee point voltage/current, class, saturated inductance and non-saturated inductance.

Using the

Quick Test

feature it is also possible to use the

CT Analyzer

as a versatile multimeter with included power source, e.g. for:

• Quick and easy resistance measurement, e.g. for wiring checks on the secondary side of CTs.

• Quick voltage ratio checks for VTs.

• Measurement of burden values, e.g. to determine the new burden value after changes of the relay equipment. This allows the re-calculation of the CT test results for the new burden value by the

CT Analyzer

and thus makes it unnecessary to run an additional CT test in order to determine the behavior of the CT with the new burden.

• Quick wiring checks using the

CPOL

polarity checker from OMICRON. Using the

CPOL

in combination with the specific test signal provided by the

CT Analyzer

’s

Quick Test

feature you can check a series of test points (e.g., the burden wiring) for correct polarity.

The

CT Analyzer

is intended exclusively for the applications described above.

Any other use is deemed not to be according to the regulations. The manufacturer and the distributor are not liable for damage resulting from improper usage. The user alone assumes all responsibility and risk.

11


1.2

Functional Components of the CT Analyzer

1.2.1

Overview

Figure 1-1 provides an overview of the operating and display elements and the connectors of the

CT Analyzer

.

Output

Generator output

Display

with context-dependent keys ("soft keys")

Remote control interface

RS232 interface and USB interface for connecting the

CT Analyzer

to a PC

Grounding terminal

12

Keyboard

with cursor keys and card selection keys

Sec, Prim

Measurement inputs

I/0 key

with status LEDs

Compact Flash card slot

Mains connection unit

Mains socket with fuse and

ON/OFF switch

Figure 1-1

CT Analyzer

overview

Introduction

1.2.2

Mains Connection Unit and Grounding

Mains socket (IEC320)

Mains fuse: 2 x T6.3A / 250V, high breaking capacity

ON/OFF switch

Grounding terminal

(4mm socket combined with knurled nut for clamp connection)

Figure 1-2 Mains connection unit and grounding terminal

1.2.3

Compact Flash Card Slot

Compact Flash card

Storage medium for test data.

Figure 1-3 Compact Flash card slot

Eject button

Press to eject the Compact Flash card.

13

14


1.2.4

Remote Control Interface (PC Connection)

CT Analyzer

devices as of serial number JHxxxx or newer are equipped with a

USB interface and a RS232 interface. You can use both interfaces alternatively to connect the

CT Analyzer

to a computer.

OMICRON recommends to use the USB interface since communication via USB is considerably faster than communication via RS232.

RS232 interface

USB interface

(type B connector)

Figure 1-4 Remote control interface (RS232 and USB)

Since in this case the

CT Analyzer

provides two alternative interfaces, the user has to select the interface to be used (or check the selection) in the

CT Analyzer

settings before connecting the

CT Analyzer

. The factory default setting for those devices is

USB

.

1. Open the

Main Menu

on the

CT Analyzer

and select

Settings

.

2. In the

Setting Menu

page, select

Remote Interface

.

3. In the

Select remote interface port

page, select the interface actually used to connect the

CT Analyzer

to the computer:

USB

or

RS232

.

The

CT Analyzer

will only communicate via the selected interface. It will not be recognized by the computer if the

CT Analyzer

settings do not match the interface used for connection.

Introduction

Note:

Please refer to the following sections for more information:

• Section 2.3 on page 23 for information on how to connect the

CT Analyzer

to a PC.

• Chapter 5 on page 59 for general information on how to operate the

CT Analyzer

.

• Section 5.7 on page 65 for more detailed information about the

Setting Menu

page.

1.2.5

Inputs and Outputs

Warning:

While the red LED of the

I/0

the output and the measurement inputs.

key is flashing, voltage is applied at

Output

Generator output.

AC: 40V rms

, 5A

DC: 120V, 15A rms

Sec

Measurement input for secondary side of CT,

150V

AC

max., 500k Ω input impedance

Prim

Measurement input for primary side of CT,

30V

AC

max., 150k Ω input impedance

Figure 1-5 Inputs and outputs of the

CT Analyzer

15

16


1.2.6

I/0 Key with Status LEDs

I/0

Red LED on the left, green LED on the right.

I/0 key to start the test.

During the boot process after switching the

CT Analyzer

on, both

LEDs are on. The red LED is switched off when the boot process is finished and the

CT Analyzer

is ready for operation.

Green LED on:

Red LED flashing:

The

CT Analyzer

is switched on and ready for operation.

Test is running.

Warning:

While the red LED is flashing, voltage is applied at the output and the measurement inputs.

Red LED steadily on: Device error.

Introduction

1.2.7

Display with Soft Keys

Card area with tab

Soft key description fields

Soft keys, labelled by the soft key description fields

Status line

Edit fields

(underlined by dotted lines)

Display field

(not underlined)

If 3 points are visible in the lowermost soft key description field (see dashed arrow), this key can be used to open an additional set of soft keys

A scrollbar is displayed if the content of a card is too long to be displayed at a time.

Use the up/down cursor keys on the keyboard to scroll through the card.

Figure 1-6 Display with context-dependent soft keys

The following icons may be displayed in the status line:

Remote control. The

CT Analyzer

is connected to a computer and a software tool of the


(e.g. the

CTA Remote Excel File Loader

) running on that computer has established connection to the

CT Analyzer

.

The keyboard on the

CT Analyzer

is locked until the running test is finished.

17


1.2.8

Keyboard

Security key. The data measured with the

CT Analyzer

can be stored in XML files. Stored files are protected by a security checksum to prevent the data within these files from being edited.

If the

CT Analyzer

displays the data of a previously stored test, and the data in this file are valid, a key is shown in the status line. If the file data are invalid since someone tried to edit them later, a broken key is displayed.

Note:

When loading older files containing no security checksum, no security information is shown.

Overload indication. The

CT Analyzer

could not output the required test current or take all necessary measurement points due to an overload.

Multi-ratio CT measurement. Indicates that a multi-ratio CT test using the optional

CT SB2

switch box has been initialized on the

CT Analyzer

(here: full tap combination X1-X4).

18

Figure 1-7 Keyboard

Numeric / character keys for entering values and text.

After pressing a key, the status line displays the character set available for the key. Press the key as often as required to scroll through the displayed character set. After

1 second or after pressing another key, the character selected in the status line is entered into the edit field in the display.

Note:

To quickly change between letters and numerics, hold the button pressed for a second.

Introduction

1.3

?

HELP

ESC

Press this key to enter capital letters.

Press this key to display the context-sensitive help system

(see section 5.9 on page 76).

Press this key to delete the character left of the cursor position.

Press this key to leave an edit field without applying a change or to leave the edit mode of a card or to go one level back in the user interface level.

The

CT-Object

card is the top user interface level.

Pressing this key several times will always bring you back to the

CT-Object

card.

Press this key to apply a change for an edit field.

When working in the

CT Analyzer

file system, use this key to open a selected folder or to confirm to move back to the next higher level in the file structure.

Use the card selector keys to display a specific card.

Use the cursor keys to select an edit field in the user interface or to move the cursor within an edit field.

Use the cursor key to enter the edit mode of a displayed card.

License-Depending Functional Scope

The functional scope provided by the

CT Analyzer

depends on the licenses actually available on the device.

This User Manual describes the full functional scope provided when the complete set of licenses is available on the

CT Analyzer

. A lack of licenses may primarily result in functional restrictions regarding the selectable standards, classes, core types and frequencies as well as the availability of individual measurement functions and/or test cards.

For up-to-date information about the licenses and packages available for the

CT Analyzer

please refer to the OMICRON website.

19

20


1.4

Scope of Delivery, Accessories, Available Licenses

For up-to-date information about the scope of delivery and available accessories and licenses for the

CT Analyzer

please refer to the OMICRON website or the

OMICRON office nearest you.

Setup and Connection

2

2.1


General Safety Rules for Connecting and Operating the CT Analyzer

Observe the following general safety rules when connecting and operating the

CT Analyzer

. The safety rules given here are supplemented by further notes and warnings applicable for specific actions only. Such specific notes and warnings are given where necessary in this user manual.

• Before putting the

CT Analyzer

into operation, check the test set for visible damages.

• When taking the

CT Analyzer

into operation, make sure that the air slots, the power switch and the power supply plug at the test set are not obstructed.

• Only use wires with 4mm safety "banana" connectors and plastic housing for connection to the front panel input/output sockets.

• During the test always connect one terminal of the transformer’s primary side to protective earth.

Warning:

Make sure that the terminals of the test object to be connected to the

CT Analyzer

do not carry any voltage potential. During a test, the

CT Analyzer

is the only permitted power source for the test object.

Warning:

Do not touch the equipment under test or the measurement leads while the red LED on the

CT Analyzer

is flashing. Never connect or disconnect measurement leads while the red LED on the

CT Analyzer

is flashing.

As long as the red LED is flashing, the output is active and lethal voltages can occur due to the high energy stored in external inductors.

Warning:

Always make sure that the

CT Analyzer

output is connected to the correct side of the current transformer according to the wiring instructions given

in sections 2.4 to 2.5 below. Accidentally mixing up the windings can cause life-

threatening voltages within the transformer and/or destroy the connected CT or the

CT Analyzer

!

21

22


2.2

Warning:

Feeding test voltage to a tap of a

multi-ratio CT

can cause lifethreatening voltages on other taps with higher ratios. Do not touch these taps!

Using the optional

CT SB2

switch box can make the testing of multi-ratio CTs much safer. If necessary, the

CT Analyzer

then reduces the test voltage in a way that the maximum possible voltage within the measurement setup (i.e., the voltage occurring at the tap combination with the highest ratio) is limited to

200V.

Setting Up the CT Analyzer

Proceed as follows to set up the

CT Analyzer

:

1. Make sure to position the

CT Analyzer

on dry, solid ground.

2. Connect the grounding terminal on the

CT Analyzer

’s side panel (see section

1.2 on page 12) to protective ground (PE). Use the original cable supplied by

OMICRON or alternatively a solid connection of at least 6mm

2

. Use a ground point as close as possible to the test object.

3. Connect the

CT Analyzer

to mains using the supplied power cord. Supply the

CT Analyzer

only from a power outlet that is equipped with protective ground

(PE). An error message (901) appears if the PE connection is defective or if the power supply has no galvanic connection to ground.

Warning:

The error message 901 is a safety relevant message! This message may appear if protective ground or equipotential ground is not connected properly or if the power supply does not have galvanic connection to ground, which can be the case in very special grid applications or if the

CT Analyzer

is supplied by a generator or an isolating transformer. For safe operation always make sure that protective ground and equipotential ground are connected properly.

4. Connect the equipment under test according to the instructions given in this

manual. Refer to sections 2.4 and 2.5 for detailed descriptions how to

connect the

CT Analyzer

for a specific measurement and/or application.


2.3

Connecting the CT Analyzer to a PC (optional)

CT Analyzer



CT Analyzer

to a computer.

Proceed as follows to connect the

CT Analyzer

to a PC:

1. Select the interface to be used (or check the selection) in the

CT Analyzer

settings:

– Open the

Main Menu

on the

CT Analyzer

and select

Settings

.

– In the

Setting Menu

page, select


.

– In the


page, select the interface actually used to connect the

CT Analyzer

to the computer:

USB

or

RS232

.

2. Connect the

CT Analyzer

to the PC using a RS232 cable or a USB cable as shown in the following figure.

CT Analyzer

connected via USB

CT Analyzer

settings:

Main Menu

->

Settings

->


->

USB

USB A/B

to PC

CT Analyzer

connected via RS232 interface and a RS232/USB adapter on the PC side

CT Analyzer

settings:

RS232/USB adapter

Main Menu

->

Settings

->


->

RS232

RS232

(crossover)

to PC

CT Analyzer

connected via RS232 interface

CT Analyzer

settings:

Main Menu

->

Settings

->


->

RS232

Figure 2-1

RS232

(crossover)

Connecting the CT Analyzer to a PC

to PC

23

24


2.4

Connection for Usual Applications

2.4.1

Wiring for a CT Test

This section shows the basic wiring of the

CT Analyzer

for a CT test.

Observe the general safety rules in section 2.1 on page 21 and the hints and

instructions for improving the quality of the measurement results given in section

2.7 on page 42.

Warning:


multi-ratio CT


Caution:

The grounded terminal on the secondary side of the CT always has to be connected to the black sockets of input "Sec" and the "Output" of the

CT Analyzer

. Connecting the red sockets of the

CT Analyzer

to PE can result in incorrect measurement and/or cause an automatic abortion of the measurement with an error message.

Caution:

If it is necessary to use clamps for the connection of the measurement leads to the secondary side of the test object, always use the

4-wire connection technique as described in section 2.7.1 on page 42 in order

to avoid measurement errors.

For a CT test, connect the

CT Analyzer

as shown in Figure 2-2:

1. Make sure that the primary side of the CT is connected to PE on one side and open on the other side.

Caution:

It is absolutely important to avoid coupling of interferences into the primary circuit during measurement. Therefore, connect the side of the primary circuit that is able to receive more interferences to PE (e.g. the side with the longer line length). The ungrounded side should be the side that receives less interferences (refer to Figure 2-2).

2. Disconnect the hot side of all secondary windings of the CT in order to remove any load from the CT. Every kind of load remaining on the secondary side of the CT during measurement leads to incorrect measurement results or error messages.

3. Connect the black socket of

CT Analyzer

input "Prim" to the grounded side of the CT’s primary circuit and the red socket of this input to the open

(ungrounded) side.


4. Connect the black "Output" socket and the black socket of input "Sec" of the

CT Analyzer

to that terminal on the secondary side of the CT that is connected to PE.

5. Connect the red "Output" socket and the red socket of input "Sec" of the

CT Analyzer

to the other (ungrounded) terminal on the secondary side of the

CT.

Utility line

Prevent coupling of interferences into the primary circuit (e.g. by disconnecting the utility line, switching off the breaker, etc).

Coupling of interferences into the ungrounded connection influences the measurement results.

The side that is able to receive more interferences has to be connected to PE.

Figure 2-2 Basic wiring for a CT test

Note:

The CT may make humming or buzzing noises of varying frequency during the CT test. This is completely normal and does not indicate a defective

CT.

25


2.4.2

Wiring for a Burden Test

For a burden test, connect the

CT Analyzer

as shown in Figure 2-3. Observe the

general safety rules in section 2.1 on page 21.

1. Open the connection line to the ungrounded side of the CT (refer to Figure

2-3).

Caution:

If you do not disconnect the CT for the burden test, the

CT Analyzer

measures the parallel impedance of the burden and the CT winding instead of the burden itself. Although in many cases the impedance of the CT is many times higher than the burden impedance, this will cause a measuring error.

The

CT Analyzer

does not perform demagnetization after burden measurement. Therefore, CT saturation could occur if you do not disconnect the CT prior to the burden test.


CT Analyzer

to that side of the burden that is connected to PE.


CT Analyzer

to the other (ungrounded) side of the burden.

CT Burden

26

Figure 2-3 Basic wiring for a burden test


2.4.3

Wiring for Primary Resistance Measurement

For the primary winding resistance measurement, connect the

CT Analyzer

as

shown in Figure 2-4. Observe the general safety rules in section 2.1 on page 21.

1. Make sure that the primary side of the CT is connected to PE on one side and open on the other side.

2. Disconnect the hot side of all secondary windings of the CT in order to remove any load from the CT. Every kind of load remaining on the secondary side of the CT during measurement leads to incorrect measurement results or error messages.

3. Connect the black socket of

CT Analyzer

input "Prim" to the grounded side of the CT’s primary winding and the red socket of this input to the open

(ungrounded) side.

4. Connect the black "Output" socket of the

CT Analyzer

to the grounded side of the CT’s primary winding and the red "Output" socket to the ungrounded side of the primary winding.

Figure 2-4 Basic wiring for primary winding resistance measurement

27


2.5

Connection for Special Applications

2.5.1

Measurement on a Gapped Core

For gapped cores, the position of the primary wire inside the core has a large influence on the ratio measurement results.

Therefore, in order to obtain correct measurement results, it is very important to arrange the primary wire during measurement to the same position inside the core as it is during real operation. Depending on the position of the primary wire inside the core, the measured ratio can differ by up to 20%.

The figure below shows how the ratio error can differ depending on the position of the primary wire inside the core.

Position 1

Ratio error measured: +0.5%

Position 2

Ratio error measured: +5%

Position 3

Ratio error measured: -15%

28

Primary wire

Air gap

Figure 2-5 Ratio error depending on the position of the primary wire inside the gapped core

As shown in Figure 2-5, the measured ratio error may differ considerably

depending on the position of the primary wire. Best measurement results are obtained if the primary wire is positioned exactly in the center of the core. As an alternative, a copper foil formed to a ring and placed to the inner side of the core

can be used as shown in Figure 2-6.


Copper foil

Figure 2-6 Using a copper foil formed to a ring as primary wire

Note:

Exact measurement results are only possible if the primary wire is positioned exactly in the center of the core.

The

CT Analyzer

does not consider leakage inductances. The leakage inductances are neglected instead. This way, the

CT Analyzer

is able to reach a measurement error of approx. 0.1% for class PR and class TPY CTs and approx. 0.8% for class TPZ CTs.

2.5.2

Excitation Curve Measurement for an Unwound Iron Core

Using the

CT Analyzer

it is possible to measure the magnetic properties of an empty, unwound iron core. For this purpose, it is necessary to apply an "auxiliary winding" of at least 20 turns to the core.

For this purpose, OMICRON offers a special cable with 23 turns (VEHK0658) and a special Microsoft Excel template for the required calculations.

Proceed as follows to perform the measurement (refer to Figure 2-7 and Figure

2-8). Observe the general safety rules in section 2.1 on page 21.

1. Apply the "auxiliary winding" cable to the unwound core.

2. Connect the "Output" sockets and input "Sec" of the

CT Analyzer

to the cable

as shown in Figure 2-7. For cores that require high currents to reach the knee

point, several cables can be cascaded to increase the number of turns, see

Figure 2-8.

3. Start the

CTA Remote Excel File Loader

with the special Excel template mentioned above.

4. Enter the iron parameters to the template.

29


Figure 2-7

23 turns auxiliary winding

Iron core without winding

Excitation curve measurement using one "auxiliary winding" cable

30

Figure 2-8 Excitation curve measurement using several cascaded

"auxiliary winding" cables

2.5.3

Measurement on a GIS (SF6) Switch Gear

Proceed as follows to perform measurements on a GIS (SF6) switch gear (refer

to Figure 2-9). Observe the general safety rules in section 2.1 on page 21.

1. Disconnect all utility lines.

2. Open all circuit breakers to the bus bars.

3. Close the earthing switch.

4. Connect one secondary side terminal of the CT to protective earth.


5. Connect the secondary side of the CT to the "Output" sockets and input "Sec" of the

CT Analyzer

:

• Connect that side of the CT that is connected to PE to the black sockets of the

CT Analyzer

.

• Connect that side of the CT that is open to the red sockets of the

CT Analyzer

.

6. Connect the primary side of the CT to

CT Analyzer

input "Prim". Make sure that the polarity is correct (same colors on same polarity).

Gas insulated busbar Earthing switch

Utility line disconnected

3m max.

Coax measurement cables

Circuit breaker

Burden

Figure 2-9

100m max.

Measurement on a GIS (SF6) switch gear

31

32


2.5.4

Measurement on Bushing-Type CTs

Measurement on a Bushing-Type CT

Proceed as follows to perform measurements on a bushing-type CT (refer to

Figure 2-10). Observe the general safety rules in section 2.1 on page 21.

1. Disconnect all utility lines from the transformer (i.e., isolate the transformer from the energized power system).

2. Connect all transformer terminals that are not used for measurement (in this example H2 and H3) to protective earth (PE) in order to minimize the external disturbances. External disturbances can influence the measurement results because the bushings are acting as an antenna.

3. Connect terminal H0 to protective earth.

4. Connect one secondary side terminal of the CT to protective earth.

5. Connect the secondary side of the CT to the "Output" sockets and the "Sec" sockets of the

CT Analyzer

:

• Connect that side of the CT that is connected to PE to the black sockets of the

CT Analyzer

.

• Connect that side of the CT that is open to the red sockets of the

CT Analyzer

.

6. Connect the primary side of the CT to

CT Analyzer

input "Prim". Make sure that the polarity is correct (same colors on same polarity).

7. Short-circuit and ground the free winding on the measured transformer leg to reduce the impedance of the winding that is connected in series to the primary side of the CT. The input impedance of

CT Analyzer

input "Prim" is only approx. 330k

Ω

and can thus influence the measurement results, if no winding of that leg is short-circuited.

8. If the transformer has a tap changer installed, the position of the tap changer should be changed to a position where the regulation winding is completely bridged in order to ensure that the regulation winding cannot act as a voltage divider together with the main winding of the transformer.


H3

(C)

(W)

H2

(B)

(V)

H1

(A)

(U)

CT

H0

(Mp)

(N)

Coax measurement cables

Figure 2-10 Measurement on a bushing-type CT

Note:

Primary terminal H1 must be open. Otherwise the primary side is shorted and the

CT Analyzer

cannot obtain proper results.

Measurement on a Y (Wye) Winding Transformer

For measurements on current transformers in Y-connected transformer windings it has to be assured that the main impedance of the transformer does not influence the measurement results.

The

CT Analyzer

has an input impedance of approx. 330k Ω . This measurement impedance can be low enough to influence the measurement results. In order to prevent any influence of the

CT Analyzer

's input impedance to the measurement results, the transformer winding at the same leg should be short-circuited. Shortcircuiting the windings on all legs of the transformer is even better.

Furthermore, all bushing terminals that are not connected to the

CT Analyzer

should be connected to protective earth in order to prevent influence of external

disturbances (see Figure 2-11).

33


34

Figure 2-11 Measurement on a Y winding transformer

Measurement on a

Δ

(Delta) Winding Transformer

CTs outside the delta winding

For CTs that are located in the bushing outside of the delta winding (Figure

2-12), no delta compensation is needed.

In this case, only two parallel transformer windings are connected in series to the CT. This connection method provides least possible influence to the measurement result for the winding resistance of the CT.

The Y winding and the remaining windings of the power transformer's delta winding are short-circuited to avoid influence of the induced flux of the power transformer's core to the measurement.


Figure 2-12 Bushing-type CT outside the delta winding power transformer

CTs inside the delta winding

For CTs that are integrated in the delta winding of the transformer, it is not possible to read the CT ratio directly since the delta winding acts as a voltage divider. In order to obtain the correct CT ratio, the ratio value determined by the

CT Analyzer

has to be corrected.

For this purpose, the

CT Analyzer

provides a "Delta Compensation" field on the

CT- Object

card where you can select the delta compensation factor depending on the bushing terminals that are used for primary signal measurement.

Figure 2-13 Setting the delta compensation on the

CT-Object

card

35

36


If it is possible to short-circuit the transformer winding at the same leg as the

primary measurement is done (see Figure 2-15), the measurement should be

performed with the winding short-circuited. In this case, no delta compensation is required since the voltage induced on the transformer’s secondary winding is zero and thus the voltage induced on the primary side of the transformer is also zero.

For the measurement setup shown in Figure 2-14, the delta compensation factor

on the

CT-Object

card has to be set to "Ratio 2/3" (see Figure 2-13).

If input "Prim" is connected between L1 and L2, the delta compensation has to be set to "Ratio 1/3".

L1

L2

L3

Figure 2-14 Measurement setup for delta compensation "Ratio 2/3"

In the configuration shown in Figure 2-15, no delta compensation is required

since the main winding of the power transformer is short-circuited on the other side. This avoids the induction of flux in the main winding of the power transformer that could influence the measurement results.


L1

L2

L3

Figure 2-15 Measurement setup for delta compensation "Ratio 1"

37

38


2.5.5

VT Ratio Measurement Using QuickTest

To measure the ratio of VTs using the

CT Analyzer

, you can either use the

Quick Test

function of the

CT Analyzer

(see chapter 8 on page 135) or the

CTA QuickTest

PC tool which is part of the


.

Observe the general safety rules in section 2.1 on page 21.

Warning:

For VT ratio measurement using the

Quick Test

feature, the

CT Analyzer

output has to be connected to the

primary side

of the VT.

Connecting the

CT Analyzer

output to the secondary side of the VT by mistake will cause hazardous voltages on the primary side!

For VT ratio measurements using

Quick Test

, connect the

CT Analyzer

as shown in Figure 2-16. For a detailed description on how to perform such

measurements, please refer to section 8.7 on page 151.


CT Analyzer

to the primary side of the VT.

2. Connect input "Prim" of the

CT Analyzer

to the secondary winding of the VT.

A a

N n

Figure 2-16 Connecting the VT for ratio measurement using the

CT Analyzer


2.5.6

VT Winding Resistance Measurement Using QuickTest

To measure the winding resistance of VTs using the

CT Analyzer

, you can either use the

Quick Test

function of the

CT Analyzer

(see chapter 8 on page 135) or

the

CTA QuickTest

PC tool which is part of the


.


For VT winding resistance measurements using

Quick Test

, connect the

CT Analyzer

as shown in Figure 2-17. For a detailed description on how to

perform such measurements, please refer to section 8.8 on page 154.

Connect the "Output" sockets and input "Sec" of the

CT Analyzer

to the winding to be measured.

A a

N n

Figure 2-17 Connecting the VT for winding resistance measurement using the

CT Analyzer

2.5.7

Polarity Check Using QuickTest and the CPOL Polarity

Checker


For the polarity check using

Quick Test

, connect the

CT Analyzer

as shown in

Figure 2-18. For a detailed description on how to perform the polarity check,

please refer to section 8.5 on page 145.

1. Ensure that the ungrounded side of the CT winding is not connected to the wiring to be checked.


CT Analyzer

to that side of the burden that is connected to PE.

39

40



CT Analyzer

to the other (ungrounded) side of the burden.

CT

Burden

CPOL



CPOL



Figure 2-18 Wiring for a polarity check of the burden wiring using

Quick Test

and the

CPOL

polarity checker

Note:

The

CT Analyzer

measures the voltage of the injected signal using input

"Sec". Therefore, you should always connect this input when using the Polarity

Check measurement type. The higher the resistance of the wiring checked (i.e., the burden wiring) or the current amplitude set on the

CT Analyzer

, the higher the terminal voltage generated by this current!


2.6

Disconnection

Proceed as follows to disconnect the

CT Analyzer

:

1. Wait until the red LED on the

CT Analyzer

is off.

Warning:

Never disconnect measurement leads while the red LED on the

CT Analyzer

is flashing. As long as the red LED is flashing, the output is active and lethal voltages can occur due to the high energy stored in external inductors.

2. Disconnect the measurement leads starting at the

CT Analyzer

.

41

42


2.7

Improving the Quality of Measurement Results

2.7.1

4-Wire Measurement vs. 2-Wire Measurement

If the secondary side of the test object does not provide screw terminals for connecting the delivered terminal adapters or banana sockets to insert the measurement leads directly, and it is therefore necessary to use clamps (e.g. crocodile clamps or Kelvin clamps) for the connection of the measurement leads, always use the 4-wire connection technique as described below.

Otherwise, the possibly existing contact resistance of the clamps could affect the measurement results, i.e., the

CT Analyzer

possibly delivers incorrect measurement results.

Both connection techniques are shown in the following figure.

OK

4-wire connection

Do not use!

2-wire connection

The measurement leads from the

"Output" sockets and input "Sec" of the

CT Analyzer

are connected to the test object via separate clamps.

One clamp is used for each measurement lead!

Correct!

Separate measurement leads are used for the "Output" sockets and input "Sec" of the

CT Analyzer

, but the measurement leads are connected to the test object via a common clamp.

Two measurement leads use one single clamp!

Do not use!

Figure 2-19 Demonstration of 2-wire and 4-wire connection technique


2.7.2

Noise Reduction Techniques

For proper test results it is important to consider the following:

• If possible, disconnect both primary terminals of the CT from the utility lines.

• If possible, always use the original coax measurement cables delivered by

OMICRON. If it is necessary to use loose single-wire measurement cables, twist the wires to a twisted-pair line. Avoid open loops consisting of individual single-wire measurement cables in order to prevent interference voltages caused by magnetic fields.

• Connect one terminal of the CT’s primary side to protective earth. If it is not possible to disconnect the utility lines from both primary terminals, connect that side of the primary circuit that is able to receive more interferences to PE

(the primary side that is still connected to the utility lines or the side with the longer line length, respectively). The ungrounded side should be the side that receives less interferences.

• When testing a CT in a utility, take care that one side of the CT is connected to PE and at least the ungrounded terminal is disconnected from all utility lines.

Refer to Figure 2-20.

Note: Do not connect both primary terminals to PE!

This would cause incorrect measurement results. Connecting both primary terminals to PE has the same effect as a short-circuit in the CT.

43

44


Utility line

Connection required if secondary side terminal cannot be disconnected

Burden

Figure 2-20 Noise reduction for CT measurement

Utility line

Use coax measurement cables!

3

Short Guide for Running a CT Test


This chapter provides a short guide for running a CT test using the

CT Analyzer

.

This short guide is intended as an overview of a complete test procedure. For

more detailed information, please refer to chapter 4 on page 49.

This short guide does not consider the residual magnetism measurement (see

section 6.4 on page 102) and does not use the guesser function of the

CT Analyzer

(see chapter 7 on page 131).

When working with the

CT Analyzer

, always observe the safety rules given in

section 2.1 on page 21.

Note:


CT.

Warning:


CT Analyzer


CT Analyzer

is flashing.


Warning:


CT Analyzer


in sections 2.4 and 2.5. Accidentally mixing up the windings can cause life-


CT Analyzer

!

Warning:


multi-ratio CT


45

46


Set up the

CT Analyzer

-> 2.2 on page 22

Switch the

CT Analyzer

on and display the

CT-Object

card

-> 4.2 on page 50

Select test cards

-> 4.2, step 2. on page 50

Enter CT name plate data

-> 4.2, step 3. on page 51

Burden

test card enabled?

No

Yes

Select test current for burden test

-> 4.2, step 4. on page 52

Start test

-> 4.3, step 1. on page 52

see next page


from previous page

Connect

CT Analyzer

for burden test

-> 2.4.2 on page 26

Burden

test card enabled?

No

Yes

Start Test

soft key

Test execution:

Burden test

Skip Test

soft key

Cancel Test

soft key

Residual Magnetism measurement if enabled

-> 6.4 on page 102

Prim.

Winding Resistance

measurement enabled?

No

Yes

Start Test

soft key

Test execution:

Prim. winding resistance measurement

Connect

CT Analyzer

for primary winding resistance measurement

-> 2.4.3 on page 27

Skip Test

soft key

Cancel Test

soft key

Connect

CT Analyzer

for CT test

-> 2.4.1 on page 24

Start Test

soft key

Test execution:

CT test

Test finished message

-> 4.3, step 11. on page 54

Skip Test

soft key

View results

-> 4.4 on page 55

Cancel Test

soft key

Disconnect or perform new test

-> 4.5 on page 57

47

48


4

Running a CT Test (Detailed)


This chapter provides a detailed description how to run a CT test using the

CT Analyzer

. Follow the sections 4.1 to 4.5 in the given order.

The example CT test described below does not use the guesser function, which is an aid for the user to find out single unknown name plate data of a CT, for example if parts of the CT’s name plate are unreadable. For detailed information

about the guesser function, please refer to chapter 7 on page 131.


CT Analyzer



Note:


CT.

Warning:


CT Analyzer


CT Analyzer

is flashing.


Warning:


CT Analyzer




CT Analyzer

!

Warning:


multi-ratio CT


49

50


4.1

4.2

Setting Up the CT Analyzer

1. Set up the

CT Analyzer

as described in section 2.2 on page 22.

Preparing and Configuring the Test

I/0

1. Proceed as follows to display the

CT-Object

card with a new CT test.

If the

CT Analyzer

is already switched on:

– If necessary, display the

CT-Object

card and then press the

Main

soft key to display the main menu.

– In the main menu, select "New CT Test" and press the

OK

soft key to initialize a new CT test.

– The display shows the

CT-Object

card, ready to start a test.

If the

CT Analyzer

is switched off:

– Switch the

CT Analyzer

on.

– After the boot process is finished, the green LED is on and the red LED is off.


CT-Object


2. For reasons of simplicity, we do not want to perform a residual magnetism measurement in our example CT test described here. Press the

Select

Cards

soft key in the

CT-Object

card to open the

Select Cards

page. Check, and if necessary make the following test card selection (see Figure 4-1):

The following test cards are required:

CT-Object

,

Burden

,

Primary Winding

Resistance

,

Secondary Winding Resistance

,

Excitation

,

Ratio

and

Assessment

.

The

Residual Magnetism

test card is not required. Deselect it if necessary.

Figure 4-1

Select Cards

page

When finished, press the

Back

soft key to return to the

CT-Object

card.


3. Enter the CT name plate data listed in the table below to the

CT-Object

card

(see Figure 4-2).

Figure 4-2

CT-Object

card with name plate data entered

I-pn

I-sn

Standard

P/M

Class

VA

Rated primary current of the CT.

Rated secondary current of the CT.

Standard to be used for the CT test and the test assessment.

CT type. Set "P" for a protection CT or "M" for a metering CT.

Rated accuracy class of the CT. This field becomes available after selecting the CT type (protection CT or metering CT).

Rated power of the CT.

Note:

For protection CTs of the IEEE C57.13 classes C, K and T, the VA parameter is not available. Enter the rated secondary terminal voltage V b

instead (see also "Specific parameters and settings displayed for IEEE C57.13 protection CTs" on page 98).

Note:

Depending on the selected standard and CT type, other or further CT data may be necessary for a correct assessment. If the "Check "*" settings before start" option is enabled in the default test settings (see section

5.7.3 on page 70), all parameters that are required for assessment are

marked by a star "*" in the

CT-Object

card. In this case, no automatic assessment will be available if you do not enter data for one or more

parameters marked by a star "*" (see section 6.2.3 on page 82).

51


4. If you enabled the

Burden

test card in step 2., display the

Burden

card and specify the test current for the burden measurement. Use the default test current derived from the I sn

previously entered in the

CT-Object

card or enter a test current of your choice to the "I-test" parameter.

52

4.3

Figure 4-3 Defining the test current in the

Burden

card

Running the Automatic Test and Connecting the

CT Analyzer

I/0

1. Start the test by pressing the the CT test is running.

I/0

key. The red LED flashes to indicate that


Burden

test card in section 4.2, step 2. on page 50 a

message is displayed, asking you to change the wiring for the burden test.

Connect the burden as described in chapter 2.

– Make sure that the red LED on the

CT Analyzer

is off.

– Refer to section 2.4.2 on page 26 for detailed information on how to

connect the

CT Analyzer

for the burden test.

– You can display the connection diagram by pressing the the wiring check message is displayed.

?

key while

Figure 4-4 Burden test: Wiring check message (left) and wiring diagram

(right)

3. Press the

Start Test

soft key to execute the automatic burden test.

Note:

If you do not want to perform the burden test, press

Skip Test

to skip the burden test and continue with the next test step or

Cancel Test

to abort the complete test.


Note:

If the "Continuous burden measurement" option is enabled in the

Settings (see section 5.7.3 on page 70), the burden test has to be stopped

manually by pressing the

I/0

key.


Primary Winding Resistance

test card in section 4.2, step 2. on page 50, a message is displayed, asking you to change the wiring

for the primary winding resistance measurement. Connect the primary

winding of the CT as described in chapter 2.


CT Analyzer

is off.


connect the

CT Analyzer

for the primary resistance measurement.


?

key while

Figure 4-5 Primary winding resistance measurement: Wiring check message (left) and wiring diagram (right)

5. Press the

Start Test

soft key to execute the automatic primary winding resistance measurement.

Note:

If you do not want to perform the primary winding resistance measurement, press

Skip Test

to skip the primary winding resistance measurement and continue with the CT test or

Cancel Test


6. A message is displayed asking you to change the wiring for the

CT test

.

Connect the CT to the

CT Analyzer

as described in chapter 2.


CT Analyzer

is off.


connect the

CT Analyzer

for the CT test.

– Be sure that the polarity of all wires is correct.


?

key while

Note:

If you do not want to execute the CT test, press the

Skip Test

soft key instead of changing the wiring. This will skip the CT test and immediately perform the demagnetization cycle to finish the test.

53

54


I/0

Figure 4-6 CT test: Wiring check message (left) and wiring diagram

(right)

7. Press the

Start Test

soft key to execute the automatic CT test.

Note:

If you do not want to perform the CT test, press

Skip Test

to skip the

CT test or

Cancel Test


8. Automatic test step 1: CT resistance measurement

The

CT Analyzer

measures the secondary winding resistance of the CT.

9. Automatic test step 2: Determination of the excitation characteristic

The

CT Analyzer

measures the excitation curve and determines the knee point and other important CT data.

10.Automatic test step 3: Ratio measurement

The

CT Analyzer

then measures the current ratio error, the phase error, the composite error and the polarity. The

CT Analyzer

calculates the ratio error for the operating burden (parameter "Burden" in the

CT-Object

card) and the nominal burden (parameter "VA" in the

CT-Object

card).

11."Test finished" message

When the test is over, the red LED stops flashing and the green LED is on.

The

CT Analyzer

displays a "Test finished" message showing the status of the test execution and the overall test assessment (see Figure 4-7).

Press any key on the keyboard to close this message.

Figure 4-7

Test finished

message when the test is over


4.4

Note:

The test results and settings of each test finished with the "Test ok" status are automatically stored to the file

OMICRON\AutoSave\

CTAnalyzer.xml

on the Compact Flash card. The existing CTAnalyzer.xml file is overwritten with each successful test. Tests that could not be finished successfully or that were aborted by the user are not stored and thus do not overwrite the existing CTAnalyzer.xml file.

After the Test is Finished

After the test is finished, the

CT-Object

card displays the CT data determined

during the test (refer to Figure 4-8).

Figure 4-8

CT-Object

card after the test is finished

Now, you can enter the "Location" and "Object" details and save the test (use the cursor keys to scroll within the card and select edit fields).

Figure 4-9

CT-Object

card after the test, ready to enter location details

(left) and after saving the test (right)

The assessment of the individual parameters can be viewed on the

Assessment

card (Figure 4-10).

Figure 4-10

Assessment


55

56


If desired, you can view the individual measurement results acquired during the test by viewing the

Burden

,

Resistance

,

Excitation

and

Ratio

cards, as shown

in the following figures 4-11 to 4-14.

Figure 4-11

Burden

card with measurement results after the test is finished

Figure 4-12

Resistance


Figure 4-13

Excitation


Figure 4-14 Ratio error and phase displacement at operating burden after the test is finished


4.5

Disconnection

After the CT test is finished, disconnect the CT under test from the

CT Analyzer

.


CT Analyzer

is off.

Warning:


CT Analyzer



CT Analyzer

.

57

58


Operating and Configuring the CT Analyzer

5 Operating and Configuring the

CT Analyzer

5.1

Working in the User Interface

5.1.1

Displaying a Specific Card

To display a specific card, select the card by pressing the card selection keys.

The card’s tab showing the name of the selected card is then highlighted (see

Figure 5-1).

Figure 5-1

CT-Object

card selected

5.1.2

Using the Soft Keys

Using the soft keys you can operate the

CT Analyzer

and change the user interface level of the software.

The functionality of the soft keys is context-dependent, i.e., the software offers different functions or selectable sets of parameters depending on the focus (i.e., depending on which card or field is highlighted or selected in the user interface).

If the lowermost soft key description field contains 3 points (see

Save As

in

Figure 5-1), additional soft key functions are available. Then you can switch the

set of displayed soft keys using the

...

key located below the soft keys (see

Figure 5-2).

1st set of soft keys 2nd set of soft keys

Figure 5-2

Press

...

Switching the set of soft keys in the

CT-Object

card

59

60


5.1.3

Editing a Card

To open the edit mode for a displayed card, press the cursor key. The

card’s tab is then no longer highlighted (see Figure 5-3). Use the cursor keys to

move the cursor and to select the desired edit field. Some edit fields have soft keys assigned. The soft keys available for an edit field are displayed if the field is selected.

Edit field

Edit field selected

Display field

(selection not possible)

Figure 5-3 Edit field selected in the

CT-Object

card

Proceed as follows to edit a card:

1. Select the edit field using the cursor keys.

2. Enter or edit the value or text:

– Select an entry offered by the soft keys (if available)

– or enter the value or text using the keyboard and then press the to confirm your input or use the

ESC

key

key to leave an edit field without applying and saving the entry.

3. Leave the edit mode either by moving the cursor to the card’s tab using the

cursor key or by pressing the

ESC

key. The focus is then set to the card’s tab again (tab highlighted).

5.2

The Main Menu

How to get there:

Press the

Main

soft key in any test card

->

Main Menu

The Main Menu can be opened from any test card by pressing the

Main

soft key.

The items in the list can be selected using the cursor keys. When an item is selected (highlighted), the soft keys are labeled with the functions available for this specific item.

Figure 5-4

Main Menu

page


5.3

New CT-Test

How to get there:

Press the

Main


Main Menu:

- New CT-Test

OK

soft key

->

CT-Object

card

By selecting "New CT-Test" in the main menu and then pressing the

OK

soft key, a new CT test with the default parameter settings is loaded and displayed in the

CT-Object

card. Some of the default values can be defined in the default

test settings (see section 5.7 on page 65).

Figure 5-5

CT-Object

card with default test settings after initializing a new

CT test

Note:

For more detailed information about the parameters and fields in the

CT-Object

card, please refer to section 6.2 on page 80.

5.4

New MR-Test

How to get there:

Press the

Main


Main Menu:

- New MR-Test

OK

soft key

->

CT-Object

card

Using the "New MR-Test" option in the main menu you can initialize a new multiratio CT test using the optional

CT SB2

switch box.

This option is only available if you have purchased a corresponding license. For more detailed information about multi-ratio CT testing using the

CT SB2

, please refer to the CT SB2 User Manual.

5.5

New Quick-Test

How to get there:

Press the

Main


Main Menu:

- New Quick-Test

OK

soft key

->

CT-Quick

card

Using the "New Quick-Test" option in the main menu you can open the optional

QuickTest

feature. With this feature you can use the

CT Analyzer

as a multimeter or perform polarity checks using the

CPOL

polarity checker.

This option is only available if you have purchased a corresponding license. For more detailed information about

QuickTest

, please refer to chapter 8 on page 135.

61


5.6

File Handling

How to get there:

Press the

Main


Main Menu:

- File Handling

Select

soft key

->

File Menu

page

In the

File Menu

page you can access all available file operation functions by selecting the entry using the cursor keys and then pressing the

Select

soft key.

62

Figure 5-6

File Menu

page

5.6.1

Available Functions

Load Report

Save As

Delete File

Rename File

Copy / Cut / Paste

File(s)

Format CF card

Loading an existing report or settings file from the

Compact Flash card.

You can also load a file by pressing the

Load

soft key in the

CT-Object

card.

Saving the current file to the Compact Flash card.

Saving a file is described in detail on page 64.

Deleting a selected file or folder from the Compact Flash card.

Only empty folders can be deleted. If you try to delete a folder still containing files or subfolders, an error message is displayed.

To select several neighboring files at a time, keep the

key pressed while selecting the files or folders using the cursor keys.

Renaming a selected file on the Compact Flash card.

Only files can be renamed. Renaming of folders is not possible on the

CT Analyzer

.

Copying or cutting a file on the Compact Flash card and pasting it at another location on the Compact Flash card.

Copying/cutting and pasting a file is described in detail on page 64.

Formatting the Compact Flash card. All data on the

Compact Flash card will be lost!


Note:

In the

CT Analyzer

file system, the root directory can contain a maximum of 240 files and the file name length (incl. the path) is limited to 240 characters.

5.6.2

Working in the File System

How to get there:

Press the

Main


Main Menu:

- File Handling

Select

soft key

File Menu:

- Load Report

or

- Save As

or

- Delete File

or

- Rename File

or

- Copy File(s)

or

- Cut File(s)

or

- Paste File(s)

After selecting one of the available file operation functions in the

File Menu

, the file system card is displayed showing the current path in its title bar and the file

system elements in the card area (refer to Figure 5-7).

Navigating in the file system

• To open a folder, select its entry (see Figure 5-7, left) using the

cursor keys and then press the key.

• To go one level higher in the directory structure, select the "one level higher" entry and then press the key.

How to get there:

Press the

Main


Main Menu:

- File Handling

Select

soft key

File Menu:

- Save As

or

- Paste File(s)

Figure 5-7 File system card for loading a report

Creating a new folder

Creating a new folder is only possible for the functions

Save As

and

Paste File(s)

of the

File Menu

.

To create a new folder in the file system, select

Save As

or

Paste Files(s)

in the file menu and then navigate to the desired location in the file system where you want to create the new folder. Then press the

New Dir

soft key. A new folder with an empty name is created. Enter a name for the folder and press the key.

Figure 5-8 File system card after creating a new folder

Note:

In the

CT Analyzer

file system, a directory can contain a maximum of 240 files and the maximum file name length is 240 characters. Renaming of folders is not supported by the

CT Analyzer

.

63

64


How to get there:

Press the

Main


Main Menu:

- File Handling

Select

soft key

File Menu:

- Save As

Saving a file

1. Open the file menu and select

Save As

.

Note:

You can also save a file by pressing the

Save

or the

Save As

soft key in the

CT-Object

card.

2. Navigate to the desired folder in the file system where you want to save the file:

• If you like to save the file with the same name, press the

Save

soft key. A warning will pop up asking whether the existing file should be overwritten or not.

• If you want to use a similar file name as an existing one in the selected folder, select this file using the cursor keys and press the

Save As

soft key or the key. A new

*.xml

file entry with the selected file name is added. Edit this file name and then press again

Save

,

Save As

or the key.

Note:

The test results and settings of each test finished with the "Test ok" status are automatically stored to the file

OMICRON\AutoSave\CTAnalyzer.xml

on the Compact Flash card. The existing CTAnalyzer.xml file is overwritten with each successful test. Tests that could not be finished successfully or that were aborted by the user are not stored and thus do not overwrite the existing

CTAnalyzer.xml file.

How to get there:

Press the

Main


Main Menu:

- File Handling

Select

soft key

File Menu:

- Copy File(s)

or

- Cut File(s)

Copying / cutting and pasting a file on the Compact Flash card

Note:

Copying / cutting and pasting folders is not possible with the

CT Analyzer

.

1. Open the file menu and select

Copy File(s)

or

Cut File(s)

.

2. The file system card appears. Navigate to the desired file you want to copy or cut.

3. Highlight the file and then press the

Copy

(or

Cut

) soft key.

To go back to the main menu without copying or cutting a file, press

Abort

.

Note:

To select several neighboring files at a time, keep the pressed while selecting the files using the cursor keys.

key

4. The file system card is closed and the file menu is displayed. Select

Paste File(s)

.

5. The file system card appears again. Navigate to the desired location in the file system where you want to paste the file.

6. Press the

Paste

soft key to paste the file.

In case of a cut/paste action, the file is not deleted from its old location until it has been pasted at its new location.


5.7

Settings

How to get there:

Press the

Main


Main Menu:

- Settings

Select

soft key

->

Setting Menu

page

In the

Setting Menu

page you can access the device settings or the default settings for a new CT test. Select an entry using the cursor keys and then press the

Select

soft key to open the corresponding settings page.

Figure 5-9

Setting Menu

page

5.7.1

Available Options in the Settings Menu

Select Language Selection of the user interface language.

One user language can be installed on the

CT Analyzer

.

The English user interface is part of the firmware and therefore always available. The second language can be

installed by the user as required (refer to section 5.8 on page 73).

Select Startup

Mode

Using this option you can select the default test mode the

CT Analyzer

comes up each time when it is switched on.

Select the mode using the soft keys:

Single Tap

: The

CT Analyzer

automatically initializes a normal single-ratio CT test.

Default Test Card

Selection

Multi-Ratio

: The

CT Analyzer

automatically initializes a multi-ratio CT test using the

CT SB2

switch box (see the

CT SB2 User Manual for more detailed information).

Quick

: The

CT Analyzer

automatically initializes the

Quick Test

measurement function (see chapter 8 on page 135 for more detailed information).

Select the test cards a new CT test should contain by

default. Please refer to section 5.7.2 on page 69.

65

66


Default Standard Select the default I sn

, standard, class and CT type (P/M) setting to be used for a new CT test using the soft keys.

"Isn": Select the default secondary current (

1A

or

5A

, or

?

if you want to use the guesser function by default).

"Standard": Select

IEC 61869-2

,

IEC 60044-1

,

IEC 60044-6

or

IEEE C57.13

.

"P/M": Select

Prot. CT

or

Meter. CT

(protection or metering CT), or

?

if you want to use the guesser function by default.

"Class": The classes available for selection depend on the selected standard and CT type (P/M). Select a class or

?

if you want to use the guesser function by default.

"Ktd" (IEC 60044-6 only):

If IEC 60044-6 is selected for the standard, it is furthermore possible to select the calculation method for the K td

(transient dimensioning factor):

Default Nominal

Frequency

acc. to IEC 60044-6

: K td

is calculated exactly according to the standard.

acc. to OMICRON

: K td

calculation considers the CT remanence.

acc. to GB 16847

: K td

is calculated acc. to the Chinese standard GB16847.

"TPX/Y/Z Spec. Mtd." (IEC 61869-2 protection CTs only):

For IEC 61869-2 protection CTs of the classes TPX, TPY and TPY it is possible to select the default method for specifying the protection requirements used for the

accuracy class assessment (refer to page 93 for more

information).

by Duty

: Protection requirements specification by duty cycle and the necessary time constants (standard specification according to IEC 61869-2; the

CT Analyzer

then calculates the K td

automatically from the entered values).

by Ktd

: Protection requirements specification by the rated transient dimensioning factor K td

stated on the

CT’s name plate (alternative specification according to

IEC 61869-2).

Nominal frequency to be used for a new CT test:

16.7Hz

,

50Hz

,

60Hz

or

400Hz

.


Temperature

Date/Time

Display Contrast

Accur. Limiting

Error Graph

Start Delay

Min. VA at M cores

Isn 5A

C57.13 electronic burdens

Select the temperature unit (

°C

or

°F

) and the default values for the ambient temperature and the reference temperature (for winding resistance measurement and calculation).

Clock settings for the device-internal clock.

Display contrast adjustment.

Enable or disable the accuracy limiting error graph.

This graph is primarily required for Chinese standards. It shows the maximum possible primary current (K * I pn

) that can flow over a specific burden without exceeding the accuracy limit (5% or 10%).

Allows the definition of a delay time of up to 10s for the actual test start after pressing the start button.

You can apply the defined delay for the burden test, the residual magnetism measurememt, the primary winding resistance measurement and the secondary winding resistance measurement.

Applies to IEC 60044-1 metering CTs with I sn

= 5A only!

Here you can set the minimum VA value used for the CT assessment to

3.75VA

. This means, selecting the

3.75VA

soft key will cause the

CT Analyzer

to assess the

CT only up to a lower nominal burden limit of 3.75VA instead of 1VA. When 3.75VA is active, it is not possible to enter VA values lower than 3.75VA in the

CT-Object

card.

Selecting

0VA

deactivates this option. Assessment is then performed up to a lower burden value of 1VA. This is the factory default which is suitable for most cases.

You should not change it without important reason.

Applies to IEEE C57.13 metering CTs only!

Enable or disable the use of the electronic burdens E-0.2 and/or E-0.04 for CT Assessment. If enabled, these values are offered in the set of soft keys available for the

"VA" and "Burden" parameters in the

CT-Object

card. In this case, CT assessment is also performed for the electronic burden values in addition to the burden values defined in the standard.

67

68


Remote interface

Misc. Settings

1

If your

CT Analyzer

is equipped with a USB interface and a RS232 interface, use this option to display the


page. On this page you can select the interface used to connect the

CT Analyzer

to a

PC:

USB

or

RS232

.

If equipped with both interfaces, the

CT Analyzer


CT Analyzer


Use the

Miscellaneous Settings

page to

• enable or disable automatic test assessment if a parameter marked with a star "*" in the

CT-Object

card was not entered by the user prior to the test.

Parameters marked with a star are mandatory parameters that are required for assessment (and possibly for the calculation of further parameters).

• enable or disable continuous burden measurement.

• define the class multiplication factor.

• define the thresholds for the decision algorithms of the guesser function.

Please refer to section 5.7.3 on page 70 for more

information.

1. Only available for

CT Analyzer

devices that are equipped with a USB interface (serial number

JHxxxx or newer).


5.7.2

Default Test Card Selection

How to get there:

Press the

Main


Main Menu:

- Settings

Select

soft key

Setting Menu:

- Default Test Card

Selection

Select

soft key

->

Select Cards

page

Enabling or disabling

test cards for the default test

is done using the

Default

Test Card Selection

option from the

Setting Menu

. In this case, the test card selection made in this page becomes effective when starting a new CT test.

If you want to enable or disable

test cards for your currently active test

only, press the

Select Cards

soft key in the

CT-Object

card. In this case, the test card selection made in this page is immediately effective after pressing the

Back

soft key.

To enable or disable a test card, select its entry using the cursor keys and then press the

Add

or

Remove

soft key. Enabled cards are marked with a

checkmark, see Figure 5-10.

Figure 5-10

Select Cards

page for selecting the default test cards

Some cards require the existence of other cards. This means that if you are adding such a card, the required other cards are automatically added, too. On the other hand, if you remove a card which is required by another card, the other

card is removed, too. Figure 5-11 shows these dependencies.

69

70


CT-Object

requires

Sec. Winding Resistance

requires

Excitation

requires

Ratio

requires


requires

Prim. Winding Resistance

Burden

requires

Assessment

requires

Comment

requires

Figure 5-11 Dependencies of test cards

To save your selection and return to the setting menu press the

Back

soft key.

To return to the setting menu without saving the selection, press the

ESC

key.

5.7.3


How to get there:

Press the

Main


Main Menu:

- Settings

Select

soft key

Setting Menu:

- Misc. Settings

Select

soft key

->

Miscellaneous

Settings

page

Figure 5-12


page


The following values can be defined in the


page.

Assessments

Check "*" settings before start

Display warning before start

Continuous burden measurement

Depending on the selected standard and CT type, some parameters and data (for example, the nominal burden) are required to obtain a correct assessment of the CT. If the user does not specify these data prior to the test, the automatic assessment function of the

CT Analyzer

possibly performs the assessment based on the actual values determined for the CT during the test and not based on the CT’s nominal data stated on the name plate.

"Check "*" settings before start"

If this option is enabled, the

CT Analyzer

checks whether the user has entered all necessary values and data relevant for an automatic assessment prior to the test start. The respective parameters are then marked by a star ("*") in the

CT-Object

card. If the user did not enter data for one or more of these mandatory parameters, no automatic assessment is performed and the

CT Analyzer

displays an "Assessment not available" message after the test is finished.

This option can be used to avoid an automatic assessment if the user did not enter all required parameters and CT data prior to the test.

"Display warning before start"

This option is only relevant if the "Check "*" settings before start" option is enabled. It is enabled automatically when enabling the "Check "*" settings before start" option but can be disabled manually.

Enabling the "Display warning before start" option displays a corresponding warning message prior to the test start if the user did not enter data for one or more of the mandatory parameters that are required for assessment.

Normally, the

CT Analyzer

stops the burden test automatically as soon as it obtains stable measurement values for the connected burden.

If this option is enabled, the burden measurement is not stopped automatically but instead performed continuously until the user stops it manually by pressing the key.

71

72


Class multiplication factor

The default value for the class multiplying factor can be set. This default is used when the

CT Analyzer

is switched on or if a new CT test is selected in the main menu.

The class multiplying factor increases the assessment level for the ratio test. For example, a class multiplier of 0.5 means that the maximum accepted tolerance for the ratio error is only half the standard tolerance.

Possible values: 0.25 to 1.00. Default: 1.00

Decision 1A/5A CT If the guesser function is active, the device uses the measured winding resistance to decide whether the

CT is a 1A or 5A CT. This value specifies the decision threshold.

Possible values: 0.5 to 2

Ω.

Default: 1

Ω.

If the measured winding resistance is higher than the defined value, the guesser function decides that the

CT’s nominal secondary current is 1A. Otherwise the secondary current is 5A.

Decision P/M CT If the guesser function is active, the device uses the measured knee point voltage to decide whether the measured CT is a protection CT or a metering CT. This value specifies the decision threshold.

If the knee point voltage is higher than the defined value, the guesser function decides that the measured

CT is a protection CT. Otherwise it is a metering CT.

• "1A: Prot. CT, if V-kn >"

Possible values: 50 to 300V. Default: 100V.

• "5A: Prot. CT, if V-kn >"

Possible values: 15 to 60V. Default: 20V.

The

Reset Values

soft key resets all values to their default values.


5.8

Tools (Update Functions)

How to get there:

Press the

Main


Main Menu:

- Tools

Select

soft key

->

Tools Menu

page

From the

Tools Menu

page you can access the update functions of the

CT Analyzer

.

Figure 5-13

Tools Menu

page

5.8.1

Available Functions

Update Text

Update Firmware

Using this item you can install a new user interface language file.

The file system page opened after selecting

Update Text

only displays files named

CTUser_*.bin

.

Please refer to section 5.8.2 on page 74.

Using this item you can update the firmware of your

CT Analyzer

.

The file system page opened after selecting

Update Firmware

only displays files named

CTAnalyzer.bin

.

Please refer to section 5.8.3 on page 75.

73


Update Licenses This function allows to add additional licenses to your

CT Analyzer

.

74

Using the

Update License

soft key you can read a license file from the Compact Flash card.

Using the

New License

soft key you can add new licenses manually.

For information on how to receive new licenses or a new license key for additional functions, please contact your local OMICRON distributor or the OMICRON support.

5.8.2

Update Text

How to get there:

Press the

Main


Main Menu:

- Tools

Select

soft key

Tools Menu:

- Update Text

-> File system card

Note:

Instead of using the

Update Text

function of the

CT Analyzer

you can also use the

Firmware Update

PC tool contained in the


.

For detailed information, please refer to the help system of the

CT Analyzer PC

Toolset

.

Using this function you can install a new user interface language file. The new language installed is then available for selection in the

Language

page.

Figure 5-14 File system card for selecting a new language file

To install a new language, select the corresponding file

CTUser_xxx.bin

in the directory

A:\OMICRON\

on the Compact Flash card using the cursor keys and press the

Select

soft key.


English is contained in the firmware and does not require a user language file.

Caution:

Only install language files that are included in the package of the installed firmware version. If you install a language file that

does not belong to the same package

, the user interface may become unreadable.

Refer to the OMICRON website for available languages or ask your distributor for a special language file.

If the text update process is interrupted or fails, the device displays an error message and automatically resets the user interface to English when it is switched on the next time.

Press

Abort

to return to the tools menu without installing a new language.

5.8.3

Update Firmware

How to get there:

Press the

Main


Main Menu:

- Tools

Select

soft key

Tools Menu:

- Update Firmware

-> File system card

Note:

Instead of using the

Update Firmware

function of the

CT Analyzer

you can also use the

Firmware Update

PC tool contained in the

CT Analyzer PC

Toolset

. For detailed information, please refer to the help system of the

CT

Analyzer PC Toolset

.

Using this function you can install new device firmware.

Figure 5-15 File system card for selecting a new firmware file

To perform a firmware update, a corresponding firmware file

CTAnalyzer.bin

has to be available in the directory

A:\OMICRON\

on the Compact Flash card.

To update the firmware, select the desired firmware file

CTAnalyzer.bin

using the cursor keys and press the

Update Firmw.

soft key.

Note:

The firmware update process may take some minutes. If the update process is interrupted or fails, switch the

CT Analyzer

off and on again. The device then tries to perform the firmware update again automatically.

75

76


5.9

It is also possible to install older firmware. In this case, the user interface text is deleted and the device automatically changes to the English user interface.

After you have downgraded the firmware, you also have to install the user interface language file of this (older) firmware package.

After the installation of new firmware, the user interface language automatically changes to English if the installed user interface text is no longer compatible. If you are using a user interface language other than English, install the corresponding new user interface language file delivered with the new firmware.

Press

Abort

to return to the

Tools Menu

page without updating the firmware.

CT Analyzer Help System

The

CT Analyzer

provides a context-sensitive help system. Pressing the

?

key displays a help page, the content of which depends on where the focus was set before the

?

key was pressed.

For example:

• If the focus is set to the

CT-Object

card’s tab, pressing the the displays a help page showing the wiring for a CT test.

• If the focus is set to the

Burden

card’s tab, pressing the the displays a help page showing the wiring for a burden test.

?

?

key

key

• If a parameter field in the

CT-Object

card or the

Assessment

card is selected with the cursor, pressing the the

?

explanatory texts for this specific parameter.

key displays a help page with

Figure 5-16 Help system showing the wiring diagram for a CT test (left) and explanatory text for a parameter (right)

When the help system is displayed, you can use the

Next Page

and

Prev. Page

soft keys to scroll through the available help pages. Pressing the

About

soft key opens a page with information about the

CT Analyzer

hardware, the installed firmware version, the serial number, etc.


5.10

Operating the CT Analyzer from a Computer

It is also possible to operate the

CT Analyzer

remote controlled from a computer.

Diverse software tools are available from OMICRON for this purpose.

For a detailed description, please refer to the help system of the


.

77

78


The CT Analyzer Test Cards

6

6.1


Overview of Test Cards

The following table provides an overview of all test cards available for the

CT Analyzer

.

The set of test cards actually available on your

CT Analyzer

depends on your purchased license(s).

Note:

For up-to-date information about available licenses for the

CT Analyzer

please refer to the OMICRON website or contact your OMICRON sales contact.

Card

CT-Object

Burden

This card is used to measure a current transformer’s

secondary burden with AC current. Refer to page 100.

Res. Magnetism

This card is used to measure the residual magnetism of

CTs. Refer to page 102.

Resistance

This card is used to measure the secondary winding resistance and the primary winding resistance of the CT.

Refer to page 105.

Excitation

Short description

This card contains the basic CT data and is always

required to perform a CT test. Refer to page 80.

Ratio

This card is used to trace the excitation curve of the current transformer and to determine further CT-specific

parameters. Refer to page 108.

This card is used to measure the current ratio of the CT considering the external load or the nominal burden and to determine the current ratio error and the phase

displacement. Refer to page 119.

Assessment

Comment

This card shows the automatic assessment of the tested parameters according to the selected standard. In this card you can also perform a manual assessment. Refer

to page 125.

In this card you can enter any text, e.g. additional notes

regarding the test. Refer to page 130.

79


6.2

CT-Object Card

The

CT-Object

card is the most important card and always required for all types of tests. In this card all necessary settings for a test are done. Some of the settings contained in the

CT-Object

card are also shown in other cards for information.

Note:

The

CT-Object

card is the top user interface level. Pressing the several times will always bring you back to the

CT-Object

card.

ESC

key

80

Figure 6-1

CT-Object

card with default settings after initializing a new CT test

6.2.1

Available Soft Keys

Clears the results of the previous test and enables to start a new test. All measurement results as well as all the parameters previously determined using the "guesser function" are cleared. Text entries for "Location" and "Object" remain unchanged.

Saves the test results and test settings to the currently loaded

CT Analyzer

report file. If the test results have not been saved yet, the

Save As

dialog is opened. Saving a file is described on page 64.

Saves the test results and test settings to a new .xml file. Saving a

file is described on page 64.

Allows to load a test stored on the Compact Flash card in order to check its results, to recalculate the results with different settings or to use its settings for a new test.

Note:

Recalculation of the existing CT test results in order to verify the behavior of the CT at different burdens or primary currents can be performed by changing the burden value on the

CT-Object

card or the primary current on the

Ratio

card. The recalculated results can then be stored again like for a regular test.


Opens the

Select Cards

page where you can select the test cards for the current test. The

Select Cards

page is described on page 69.

Note:

When loading a new CT test from the main menu (using the

"New CT-Test" entry), the test card selection defined in the default test settings is used for this new test. The card selection performed in the

CT-Object

card will then be discarded.

6.2.2

Information Fields to be Filled by the User

Figure 6-2 Editing the location settings in the

CT-Object

card

The "Location" and "Object" text fields are only used for reporting and documentation purposes. They can be filled by the user after the test is finished.

These fields provide information about the location of the CT and the CT itself.

The content of these fields is defined in the

Location settings

page and the

Object settings

page, respectively.

To open these settings pages, position the cursor on the "Location" or the

"Object" field and then press the

Details

soft key or the key.


page

Object settings

page

The


page provides the following text fields.

Each field can contain a maximum of 40 numbers or letters.

• Company, Country, Station, Feeder:

Information where the CT is installed.

• Phase: Phase to which the CT is connected.

• IEC-ID: IEC-ID of the CT or freely definable information.

The

Object settings

page provides the following text fields.

Each field can contain a maximum of 40 numbers or letters.

• Manufact.: Manufacturer of the CT under test.

• Type: Type number or description of the CT under test.

• Serial No.: Serial number of the CT under test.

• Core: Number of the tested core.

• Tap: Description of the tap (e.g. 1S1-1S3, X1-X4, ...).

• Optional 1: Optional field for free use.

81

82


6.2.3

Parameters and Settings Used or Determined by the Test

Process

The fields described in this section are used and/or determined by the test process.

Figure 6-3 Editing the

CT-Object

card

Note:

If the "Check "*" settings before start" option is enabled in the default test

settings (see section 5.7.3 ”Miscellaneous Settings” on page 70), no automatic

assessment will be available if you do not enter data for a parameter that is relevant for assessment. Such parameters are marked by a star "*" in the

CT Analyzer

user interface and in the following tables.


Common Parameters and settings displayed for all standards,

CT types and classes

The table below lists all parameters and settings that are displayed for all standards, CT types and classes.

In addition to these common parameters, specific additional parameters are displayed in the

CT-Object

card depending on the selected standard, CT type

(protection or metering CT) and class. For these specific parameters, please

refer to the tables on pages 87 to 99.

Parameter Description

I-pn

I-sn

Standard

P/M *

Rated primary current.

Possible values: 1 to 99000A or

?

1

soft key. Default: ?.

Rated secondary current.

Possible values: 0.0001 to 25A or soft keys

1.0

,

2.0

,

5.0

,

1.0A/

√

3

,

2.0A/

√

3

,

5.0A/

√

3

or

?

1

.

Default: ?.

Standard according to which the test has to be performed.

Possible values: Soft keys

IEC 60044-1

,

IEC 60044-6

,

IEEE C57.13

or

IEC 61869-2

Default: Standard defined in the default test settings.

Note:

Using the IEEE C57.13 standard for transformers with gapped cores may possibly deliver incorrect results.

Definition of CT type: Protection or metering CT.


Prot. CT

,

Meter. CT

or

?

1

.

Default: As defined in the default test settings.

* This parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see

page 82).

83

84



Class * Accuracy class of the CT.

Possible values: Depending on the selected standard or

?

1

.


This parameter is only displayed, after the parameters "Standard" and "P/M" have been defined or determined by the

CT Analyzer

. Depending on these parameters, the parameters for the CT class can be selected using the soft keys.

Note:

The class can be selected by soft keys or is determined by the

CT Analyzer

during the test. Automatic determination during the test only works for IEC 61869-2 or IEC 60044-1 metering CTs and IEEE C57.13 metering CTs. If the question mark has been entered for the "P/M" parameter, the "Class" cannot be defined by the user but is automatically determined by the

CT Analyzer

instead.


page 82).

For IEEE C57.13 metering CTs only:

An additional soft key

Assess @ VA

is available for metering CTs according to IEEE C57.13. Use this option if the accuracy class of the CT only applies to one specific burden.

CT assessment is normally performed for the maximum burden specified

("VA" or "Burden" parameter)

and

all lower burdens defined in the standard.

Example: If the burden specified is B-0.9, the assessment is performed for the burdens B-0.9, B-0.5, B-0.2 and B-0.1 (and the electronic burdens E-0.2 and E-0.04).

Selecting the

Assess @ VA

option in addition to the class setting will cause the

CT Analyzer

to consider

only

the burden value specified prior to testing for the CT assessment. The ratio table and the phase table in the

Ratio

card

then only show the error for this specific burden (see section 6.7.5 on page

123).

When

Assess @ VA

is selected, the soft key changes to

Assess all VA

to enable deactivation of this option.


f


VA *

Cos ϕ

Nominal burden of the CT, used to calculate the behavior of the CT at the nominal burden.

Possible values: 0 to 300VA or soft keys

1.0VA

to

30VA

or

?

1

.

Depending on the burden and the selected test standard, the corresponding cos ϕ

is used (cos ϕ

not editable by the user).


page 82).

If the IEEE C57.13 standard is selected with the type "metering CT", the

CT Analyzer

offers some soft keys (e.g.

B-0.1

,

B-0.2

,

B-0.5

etc.) with standard loads for the power. If these soft keys are used, the power is calculated according to table 9 of IEEE C57.13. If the rated current is not 5A, the resistance and inductance of the table is multiplied by the factor

α

=





I

------------rated





2

Burden

Cos ϕ

If the IEEE C57.13 standard is selected with the type "protection CT" (class

C, K or T), the VA and Cos ϕ parameters are not accessible to the user. In this case, the user has to enter the terminal voltage V b

instead. See "Specific parameters and settings displayed for IEEE C57.13 protection CTs" on page 98.

"Burden" and "Cos ϕ

" are used to define the operating burden connected to the CT. These parameters are used to calculate the behavior of the CT at the operating burden (connected burden) and the corresponding cos ϕ

.

Possible values for "Burden": 0 to 300VA or soft keys

1.0VA

to

30VA

or

?

1

.

Possible values for "Cos ϕ

": 0 to 1.

These parameters can also be changed after the test or in a loaded test report in order to check the CT behavior at different burden values.

Special behavior depending on available test cards:

If the test contains a

Burden

card, a question mark is automatically entered to the fields "Burden" and "cos ϕ " and entering the burden is not possible until the test is finished. In this case, the value determined during the burden test is automatically entered after burden measurement. If I sn

is defined, the burden is updated immediately after the burden test is finished. If I sn

is not defined (entry "?"), the burden is updated after the resistance test.

Rated frequency of the CT.

Possible values: Integer value between 16 and 400 Hz or soft keys

16.7Hz

,

50Hz

,

60Hz

or

400Hz

.

Default: Frequency defined in the default test settings.

85

86



Rprim Specified primary winding resistance (only available if primary winding resistance measurement is enabled for the test).

Possible values: 0 to 3000 ohms or soft key

?

1

.

Default: ?.

Class mult. factor

Delta compensation

Class multiplying factor.

This factor increases the assessment level for the ratio test. E.g. a class multiplier of 0.5 means that the maximum accepted tolerance for the ratio error is only half the standard tolerance.

Possible values: 0.25 to 1.00 or soft key

1.0

.

Default: 1.0 (as set in the device settings:

Main Menu

, entry "Settings" ->

Setting Menu

, entry "Misc. Settings").

Correction factor for the ratio measurement. This factor enables the ratio measurement for CTs that are installed inside a delta winding transformer.


Ratio 1

,

Ratio 2/3

or

Ratio 1/3

.

Default: Ratio 1.

Choose "Ratio 1" if no correction is required.

Choose "Ratio 2/3" if input PRIM is connected to the two terminals of that transformer winding, the CT is in series with.

Choose "Ratio 1/3" if input PRIM is connected to the terminals of a transformer winding, the CT is not in series with.

1. If the question mark is entered for this parameter and a new test is started, the

CT Analyzer

automatically tries to determine the value using its integrated guesser function (see chapter 7 on page 131).


Specific parameters and settings displayed for IEC 60044-1 protection CTs

The following parameters are only displayed in the

CT-Object

card if the standard IEC 60044-1 is selected with the type "Protection CT".

Param. Description

ALF

Rct

Ts

Kx

Ek

Ie

E1

Ie1

Accuracy limiting factor acc. to IEC 60044-1.

Possible values: Integer value from 1 to 300 or soft keys

?

1

,

5

,

10

,

15

,

20

or

30

.

Default: ?.

Specified secondary winding resistance.


?

1

.

Default: ?

Specified secondary time constant.

Possible values: 0.000 to 100.0s or soft key

?

1

.

Default: 100s.

Dimensioning factor acc. to IEC 60044-1, PX.

Possible values: 1 to 300 or soft key

?

1

.

Default: ?.

Rated knee point e.m.f.


?

1

.

Default: ?.

Accuracy limiting current acc. to IEC 60044-1, PX.

Possible values: 0.03mA to 30A or soft key

?

1

.

Default: ?.

User-defined e.m.f. to verify the excitation current at this specific e.m.f.

Possible values: 0.1 to 20000V or soft key

?

2

.

Default: ?.

Maximum allowed excitation current at E

1

.

Possible values: 0.03mA to 30000mA or soft key

?

3

.

Default: ?.

Available for IEC 60044-1 protection CTs, class

2P, 3P,

4P, 5P,

6P, 10P

2PR, 3PR,

4PR, 5PR,

6PR, 10PR PX

x x x x x x x x x x


CT Analyzer


2. If the question mark is entered, half the voltage entered or measured for E k

is used.

3. If the question mark is entered, the

CT Analyzer

uses the excitation current measured at the voltage value defined at E

1

. In this case, the assessment for this parameter is OK.

87

88


Specific parameters and settings displayed for IEC 60044-1 metering CTs


CT-Object

card if the standard IEC 60044-1 is selected with the type "Metering CT".

Param. Description Available for

IEC 60044-1 metering CTs, class

0.1, 0.2, 0.2s, 0.5,

0.5s, 1, 3, 5

FS Instrument security factor acc. to IEC 60044-1.


?

1

,

FS1

,

FS1.5

,

FS2

,

FS5

,

FS10

,

FS20

or

FS30

.

Default: ?.

ext. Ipn Extended current rating.

Possible values: 100 to 400% or soft keys

120%

,

150%

,

200%

,

300%

,

400%

.

Default: 120%.

x x


CT Analyzer



Specific parameters and settings displayed for IEC 60044-6


CT-Object

card if the standard IEC 60044-6 is selected.

Param.

Description

Rct

Kssc

Tp

K

V-al

I-al

E1

Ie1

Ktd



?

1

.

Default: ?

Rated symmetrical short-circuit current factor.

Possible values: 1 to 300 or soft keys

?

1

,

3

,

5

,

7.5

,

10

,

12.5

,

15

,

17.5

,

20

,

25

,

30

,

40

or

50

.

Default: ?.

Primary time constant.

Possible values: 0.000 to 5.000s or soft keys

20ms

,

40ms

,

60ms

,

80ms

,

100ms

or

120ms

.

T p

depends on K as follows:

T p

=

Dimensioning factor.

Possible values: 1 to 1572.

K depends on T p

as described above for T p

.

Rated equivalent excitation limiting secondary voltage.

Possible values: 0 to 9999V or soft key

?

1

.

Default: ?.

Accuracy limiting secondary excitation current.


?

1

.

Default: ?.



?

2

.


1

(user-defined e.m.f.).


?

3

.

Rated transient dimensioning factor.

Possible values: 1.0 to 2043 or soft key

?

1

.

Default: ?.

Available for

IEC 60044-6, class

TPS TPX TPY TPZ

x x x x x x x x x x x x x x x x x x x x

89

90


Param.

Ts

Duty t1 t-al1 t2 t-al2 tfr

Description



?

1

.

Default: ?.

Specified duty cycle.

Using the soft keys, two different energizing cycles can be selected:

C-O

or

C-O-C-O

Default: C-O.

Duration of first current flow. The specified accuracy limit must not be reached within time t al1

.


100ms

.

Default: 0.1s.

Permissible time to accuracy limit for first energizing period of the duty cycle.

Possible values: 0.000 to 5.000s and max. t

1

or soft key

40ms

.

Default: 0.04s.

Duration of second current flow. The specified accuracy limit must not be reached within time t al2

.

Note:

Only displayed if "Duty" is C-O-C-O.


100ms

.

Default: 0.1s.

Permissible time to accuracy limit for second energizing period of the duty cycle.

Note:



2

or soft key

40ms

.

Default: 0.04s.

Dead time between first opening and reclosure.

Note:



300ms

.

Default: 0.3s.

Available for

IEC 60044-6, class

TPS TPX TPY TPZ

x x x x x x x x x x x x x x


Param.

Description Available for

IEC 60044-6, class

TPS TPX TPY TPZ

Ktd calculation

Calculation method for transient dimensioning factor K td

.

Select a calculation method using the soft keys:

acc. to IEC 60044-1

(calculation exactly acc. to standard),

acc. to OMICRON

(calculation considers CT remanence) or

acc. to GB 16847

(acc. to Chinese standard GB 16847).

Default: As defined in the default test settings (see

"Default Standard" parameter in section 5.7.1 on page 65).

x x


CT Analyzer



is used.


CT Analyzer


1


91

92


Specific parameters and settings displayed for IEC 61869-2 protection CTs


CT-Object

card if the standard IEC 61869-2 is selected with the type "Protection CT".


ALF

Rct

Ts

Kx

Ek

E1

Ie

Ie1

Available for IEC 61869-2 protection CTs, class protection transient protection

x

P

x

PR PX PXR TPX TPY TPZ

Accuracy limiting factor acc. to IEC 61869-2.


?

1

,

5

,

10

,

15

,

20

or

30

.

Default: ?.



?

1

.

Default: ?



?

1

.

Default: 100s.

Dimensioning factor acc. to IEC 61869-2.


?

1

.

Default: ?.



?

1

.

Default: ?.



?

2

.

Default: ?.

Accuracy limiting current acc. to IEC 61869-2.


?

1

.

Default: ?.


1

.

Possible values: 0.03mA to 30000mA or soft key

?

3

.

Default: ?.

x x x x x x x x x x x x x x x x x x x x x x



Kssc Rated symmetrical short-circuit current factor.

Possible values: 1 to 300 or soft keys

?

1

,

3

,

5

,

7.5

,

10

,

12.5

,

15

,

17.5

,

20

,

25

,

30

,

40

or

50

.

Default: ?.

Spec.

The accuracy class assessment has to be performed for the specific protection requirements the CT is built for. According to the standard, these requirements are normally stated by the duty cycle and the time constants.

However, in some cases the choice of one specific duty cycle/time constant cannot describe all protection requirements.

Therefore, the

CT Analyzer

offers the possibility to specify "more general requirements" (which cover the requirements of different duty cycles and time constants) by entering the K td

instead.

Use the soft keys to choose if you want to specify the protection requirements used for the accuracy class assessment

• by specifying the duty cycle and the necessary time constants (

by Duty

, standard specification according to

IEC 61869-2; the

CT Analyzer

then calculates the K td entered values)

automatically from the

• or alternatively by specifying the rated transient dimensioning factor K td

stated on the CT’s name plate (

by Ktd

, alternative specification according to IEC 61869-2).

The setting of this parameter displays or hides the parameters K td

, and T p

, Duty and t al1

(see parameter descriptions below).


by Duty

or

by Ktd

.



x

P

x


x x x x x x

93

94



Ktd * Rated transient dimensioning factor according to the name plate.

Note:

Only displayed if parameter "Spec." is

"by Ktd".

Possible values: 1.0 to 2043 or soft key

?

1

.

Default: ? or ?*.

Tp *

* If displayed, this parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this

parameter prior to the test (see page 82).

Primary time constant.

Note:


"by Duty".

Possible values: 0.000 to 5.000s or soft keys

20ms

,

40ms

,

60ms

,

80ms

,

100ms

or

120ms

.


x

P

x


x x x x x x

Duty

T p

depends on K as follows:

T p

=

Default: ? or ?*.



Specified duty cycle.

Note:


"by Duty".

Using the soft keys, two different energizing cycles can be selected:

C-O

or

CO-CO

Default: C-O.

x x x



t-al1 * Permissible time to accuracy limit for first energizing period of the duty cycle.

Note:


"by Duty".


1 or soft key

40ms

.

Default: ? or ?*.

t1 * tfr *



Duration of first current flow. The specified accuracy limit must not be reached within time t al1

.

Note:


"by Duty" and "Duty" is "CO-CO".


100ms

.

Default: ? or ?*.



Dead time between first opening and reclosure.

Note:




300ms

.

Default: ? or ?*.




x

P

x


x x x x x x x x x

95

96


Param. Description Available for IEC 61869-2 protection CTs, class protection transient protection

x

P

x


t-al2 * Permissible time to accuracy limit for second energizing period of the duty cycle.

Note:




40ms

.

Default: ? or ?*.



x x x


CT Analyzer



is used.


CT Analyzer


1



Specific parameters and settings displayed for IEC 61869-2 metering CTs


CT-Object

card if the standard IEC 61869-2 is selected with the type "Metering CT".


IEC 61869-2 metering CTs, class

0.1, 0.2, 0.2s, 0.5,

0.5s, 1, 3, 5

FS Instrument security factor acc. to IEC 61869-2.


?

1

,

FS1

,

FS1.5

,

FS2

,

FS5

,

FS10

,

FS20

or

FS30

.

Default: ?.

ext. Ipn Extended current rating.

Possible values: 100 to 400% or soft keys

120%

,

150%

,

200%

,

300%

,

400%

.

Default: 120%.

ext. VA Extended burden range for ratio error and phase displacement assessment according to IEC 61869-2.

The assessment of the ratio error and the phase displacement is usuallly performed down to a burden of 12.5% of the nominal burden. If the "ext. VA" parameter is set to "on", the assessment is performed for an extended range down to a burden of 1VA if the limit of 12.5% results in a burden higher than 1VA.


On

or

Off

.

Default: On.

x x x


CT Analyzer


97

98


Specific parameters and settings displayed for IEEE C57.13 protection CTs

The following parameter is only displayed in the

CT-Object

card if the

IEEE C57.13 standard is selected with the type "Prot. CT".

Param.

Description Available for

IEEE C57.13, class

C T X K

1

Vb *

Vk

Vk1

Rated secondary terminal voltage.

If the IEEE C57.13 standard is selected with the type

"protection CT" (class C, K or T), the VA and Cos ϕ parameters are not accessible to the user. In this case, the user has to enter the terminal voltage V b

instead.

Possible values: Integer values from 10 to 1200V or soft keys

?

2

,

10V

,

20V

,

50V

,

100V

,

200V

,

400V

or

800V

.

Default: ? or ?*.

* This parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for

this parameter prior to the test (see page 82).

User-defined measuring point.

User-defined measuring point 1.

Possible values: Integer values from 0.1V to 20.000V or soft key

?

1

.

Default: ?.

Ik

Ik1



Possible values: Integer values from 0.03mA to

30.000mA or soft key

?

2

.

Default: ?.

RE(20*Isn) Ratio error at 20 * I sn

.

Possible values: Integer values from 1% to 99%.

Rct

Default: 10%.



?

1

.

Default: ?

x x x x x x x x x

1. Acc. to IEEE C57.13 (1993)


CT Analyzer



Specific parameters and settings displayed for IEEE C57.13 metering CTs

The following parameter is only displayed in the

CT-Object

card if the

IEEE C57.13 standard is selected with the type "Metering CT".


IEEE C57.13 metering CTs, class

0.15, 0.15s, 0.3,

0.6, 1.2

RF Continuous current rating factor.

Possible values: Value from 1.0 to 4.0 or soft keys

RF1.5

,

RF2

,

RF3

or

RF4

.

Default: 2.

x

99


6.3

Burden Card

The

Burden

card is only available if it is enabled on the

Select Cards

page

(Default Test Card Selection or

Select Cards

soft key in the

CT-Object

card).

Using the

Burden

card, a current transformer’s secondary burden impedance can be measured with the selected secondary current (I sn

If a current other than I sn current can be entered in the "I-test" parameter field.

) at nominal frequency.

should be used to test the burden, the desired test

No soft keys are available in the

Burden

card.

100

Figure 6-4

Burden

card

If the

CT Analyzer

cannot reach the desired test current I test

, an overload message is displayed in the right-hand corner of the status line.

6.3.1

Test Settings

The following settings can be done in the

Burden

card.

Parameter

I-test

Description

Test current used to measure the external burden.

After clearing the test results or when starting a new CT test, the test current is automatically chosen as follows:

Value for I-sn in CT-Object card

"?" e.g. "?" e.g. 5A e.g. 5A

Value for I-test in Burden card

none e.g. 5A none e.g. 1A

Test current used for burden test

1A

5A (value of I-test)

5A (value of I-sn)

1A (value of I-test)

It is possible to overwrite the default test current using the keyboard (0.1 to 5A).

Always verify the test current settings prior to starting the test in order to avoid damaging of the

CT or other equipment.


6.3.2

Test Results

The lower part of the

Burden

card shows the results of the burden test after the test is finished.

Parameter

I-meas

V-meas

Burden /

Cos ϕ

Z

Description

Current measured during the test.

Voltage measured at the load during the test.

Burden and cos ϕ calculated from the measured quantities.

If the rated secondary current is not known, the result field will only show "n/a" as long as I sn

is not defined.

Impedance of the burden calculated from the measured quantities.

6.3.3

Connecting the Burden and Running the Burden Test

1. Press the

Select Cards

key soft in the

CT-Object

card to open the

Select

Cards

page. Enable the

Burden

test card in the

Select Cards

page. Press the

Back

soft key to apply your test card selection and return to the

CT-Object

card.

Figure 6-5

Select Cards

page with

Burden

test card enabled

2. In the

Burden

card, use the default test current or enter the desired test current to parameter "I-test".

3. Execute the burden test as described in section 4.3 on page 52.

Possible test steps following the burden test:

• Residual magnetism measurement, see section 6.4.2 on page 103.

• Primary resistance measurement, see section 4.3, steps 4. & 5. on page 53.

• CT test, see section 4.3, steps 6. to 11. on page 54, and sections 4.4 on page

55 and 4.5 on page 57.

101

102


6.4

Residual Magnetism Card

Note:

Residual magnetism

is an optional feature. The functionality described below is only available if you have purchased a corresponding license. For further information, please contact your OMICRON sales contact or the

OMICRON office nearest you.

The


card is only available if it is enabled on the

Select Cards

page (Default Test Card Selection or

Select Cards

soft key in the

CT-Object

card).

High-transient currents or DC currents applied to the primary side of a CT can cause saturation effects inside the CT with a possible subsequent displacement of the operating point on the CT’s excitation curve. The CT then has a residual magnetic flux in its core even if no current is applied on the primary side. The CT has residual magnetism.

Residual magnetism in CTs may cause erroneous tripping or prevent tripping of the connected protection relay since the behavior of the CT is no longer as specified and expected.

Using the


card it is possible to measure the residual magnetism of CTs.

The

CT Analyzer

performs demagnetization of the CT after the test is finished. Please note that the residual magnetism the CT had prior to testing gets lost through the test.

Figure 6-6


card

Note:

The wiring for residual magnetism measurement is identical to the wiring

for a normal CT test (see section 2.4.1 on page 24).

Note:

Gapped cores normally have very low residual magnetism. The

CT Analyzer

is possibly not able to determine the knee point of gapped cores.


6.4.1

Test Settings and Results

The following settings and test results are displayed in the


card.

Parameter

I-sn

Description

Nominal secondary current of the CT as entered in the

CT-Object

card.

The I sn

of the CT has to be specified

prior to the execution

of the residual magnetism measurement. Otherwise, a corresponding message is displayed.

Residual Flux Absolute value [in Vs] of the residual magnetic flux in the CT determined by the

CT Analyzer

.

The residual flux is always displayed after measurement, even if the

CT Analyzer

could not determine the residual magnetism.

Residual

Magnetism

Residual magnetism [in %] of the CT, calculated from the residual flux and the maximum flux of the CT.

No value is displayed if the

CT Analyzer

was not able to reach the knee point of the excitation curve.

6.4.2

Running a Residual Magnetism Measurement

1. Press the

Select Cards

soft key in the

CT-Object

card to open the

Select

Cards

page. Enable the


test card in the

Select Cards

page. Press the

Back

soft key to apply your test card selection and return to the

CT-Object

card.

Figure 6-7

Select Cards

page with


test card enabled

2. If not already specified, enter the I sn

of the CT on the

CT-Object

card.

103

104


3. Connect the CT to the

CT Analyzer



CT Analyzer

is off.


connect the

CT Analyzer

. The wiring for the residual magnetism measurement is identical to the wiring for the CT test.



?

key while

Figure 6-8 Wiring diagram for residual magnetism measurement and

CT testing

4. Start the test by pressing the

I/0

key.

Warning:


CT Analyzer


CT Analyzer

is flashing.


5.

If the burden test is enabled

, the test halts and the

CT Analyzer

displays a corresponding message, asking you to check the wiring for the burden test.

Connect the burden and run the burden test as described in section 4.3, steps 2. & 3. on page 52.

6. After the burden measurement is finished, the test halts to allow rewiring for the residual magnetism measurement. Make sure that the red LED on the

CT Analyzer

is off and reconnect the CT as described in step 3 above.

7. Continue testing by pressing the

Start Test

soft key.

8. The

CT Analyzer

runs the residual magnetism measurement.

9.

If the primary resistance measurement is enabled

, the test halts and the

CT Analyzer

displays a corresponding message, asking you to check the wiring for the test. Connect the

CT Analyzer

and run the primary winding

resistance measurement as described in section 4.3, steps 4. & 5. on page 53.

10.After the primary resistance measurement is finished, the test halts to allow rewiring for the CT test. Connect the

CT Analyzer

and run the CT test as

described in section 4.3, steps 6. to 11. on page 54.


6.5

Resistance Card

The

Resistance

card is only available if winding resistance measurement is enabled in the

Select Cards

page (Default Test Card Selection or

Select Cards

soft key in the

CT-Object

card).

The

Select Cards

page offers two different types of winding resistance measurements for selection:

•

Primary winding resistance measurement

(only required in case of a perceptible primary winding resistance, i.e., if the primary winding actually

consists of multiple turns). See section 6.5.1 on page 106 for more

information.

•

Secondary winding resistance measurement

(always required for CT testing for particular calculations in the excitation and ratio test). See section

6.5.2 on page 106 for more information.

Depending on your selection on the

Select Cards

page, the

Resistance card

shows the parameters and results for the primary winding resistance measurement or the secondary winding resistance measurement only, or for both measurements.

Figure 6-9

Resistance card

showing parameters and results for primary

and

secondary winding resistance measurement

Figure 6-10

Resistance card

for secondary winding resistance measurement only (left) and for primary winding resistance measurement only (right)

105

106


6.5.1

Primary Winding Resistance Measurement

Measuring the primary winding resistance is only required in case of a perceptible primary winding resistance, i.e., if the primary winding actually consists of multiple turns.

Primary winding resistance measurement is performed prior to the CT test and requires special wiring.

Note:

If no CT test is performed following the primary winding resistance test, a demagnetizing cycle is performed after the test to guarantee complete demagnetization of the CT.

Running the primary winding resistance measurement

1. Press the

Select Cards

key soft in the

CT-Object

card to open the

Select

Cards

page. Enable the

Primary winding resistance

measurement in the

Select Cards

page. Press the

Back

soft key to apply your selection and return to the

CT-Object

card.

Figure 6-11

Select Cards

page with

Primary winding resistance

measurement enabled

2. Execute the test as described in section 4.3 on page 52.

6.5.2

Secondary Winding Resistance Measurement

During the CT test, secondary winding resistance measurement is necessary since the CT winding resistance is needed for particular calculations in the excitation and ratio test. This measurement is performed completely automatically.

Note:

If only the secondary winding resistance test is selected, a demagnetizing cycle is performed after the test to guarantee complete demagnetization of the

CT.


6.5.3

Test Settings and Results

The following settings are required to perform a winding resistance test.

Parameter

T-meas

T-ref

Description

Winding temperature of the CT at the time of measurement.

Value used:

Ambient Temperature defined in the

Settings

(main menu).

If this temperature is not set correctly, the reference resistance value (R ref

) at reference temperature will not be calculated correctly.

Reference temperature, i.e, temperature the CT is specified for.

Value used:

Reference temperature defined in the

Settings

(main menu).

The winding resistance at reference temperature is calculated from the winding resistance measured at ambient temperature

(T meas

) and the specified reference temperature.

The following parameters show the results of the winding resistance test after the test is finished.

Parameter

I-DC

V-DC

R-meas

R-ref

Description

Current used for measurement. Selected automatically, cannot be changed by the user.

Secondary winding resistance measurement only:

If I sn

is between 0.1 and 1 A, I

DC

is automatically set to I sn

.

If I sn

is lower than 0.1 A, I

DC

is automatically set to 0.1 A.

Maximum value: 1 A.

Primary winding resistance measurement only:

Maximum value: 10 A.

Measured voltage.

Measured resistance at ambient temperature.

Reference resistance (temperature-compensated resistance, compensated to T ref

).

107

108


6.6

Excitation Card

The

Excitation card

is only available if it is enabled in the

Select Cards

page


Select Cards

soft key in the

CT-Object

card).

The excitation test is used to trace the excitation curve of the current transformer and to determine many CT-specific parameters (see test results below). The test is done completely automatically up to a current of 15A peak

.

CTs with closed cores can be tested up to a knee point voltage of 30kV. For CTs with gapped cores the maximum test voltage and current are limited depending on the maximum output power of the device. Typical maximum current and voltage values for a TPZ core are 9A rms

at 1200V rms

.

The settings for the excitation test are specified in the

CT-Object

card. For a better understanding of the test results, the most important settings from the

CT-Object

card are shown in the upper part of the

Excitation

card.

The test results displayed in the lower part of the

Excitation

card depend on the standard selected in the

CT-Object

card. Using the soft keys, the user can choose between different sets of results. If the

Results with Nom. Burden

soft key is pressed, the page shows the results related to the nominal burden ("VA" parameter in

CT-Object

card). If the

Results with Op. Burden

soft key is pressed, the page shows the results related to the operating burden ("Burden" parameter in

CT-Object

card).

Pressing the

Excit. Graph

soft key opens a page with the excitation graph (see

page 114).

Pressing the

AL Error Graph

soft key opens a page with a graph showing the maximum possible primary current (K * I pn

) that can flow over a specific burden without exceeding the accuracy limit (5% or 10%).

Figure 6-12

Excitation

card with values related to nominal burden

If the

CT Analyzer

displays an overload in the

Excitation

card, either the desired knee point could not be reached or not all necessary measurement points could be taken (e.g. in the knee point area, not enough points for a proper calculation of the knee point could be measured).


6.6.1


Displays the results related to the nominal burden of the CT.

or

Displays the results related to the operating burden of the CT.

Opens the excitation graph page (refer to section 6.6.4 on page 114).

Opens the AL error graph page (refer to section 6.6.5 on page 117).

This graph is part of Chinese standards and shows the maximum possible primary current (K * I pn

) that can flow over a specific burden without exceeding the accuracy limit.

6.6.2

Test Settings

The upper part of the

Excitation

card shows the test settings adjusted in the

CT-Object

card.

6.6.3

Test Results

The test results are displayed in the lower part of the

Excitation

card. The display of test results depends on the following:

• The standard defined in the

CT-Object

card, the class and the type of CT

(metering or protection CT).

The following tables provide an overview of which test results (parameters) are displayed for which standard.

• The burden selected with the soft key (


or


).

Depending on the selected burden, the

Excitation

card shows the results either calculated with the nominal burden (


) or calculated with the operating burden (


).

The displayed pages are identical to a large extend, except the field label for the burden parameter ("VA" in case of nominal burden and "Burden" in case of operating burden) and the result values.

109

110


Test results displayed in the Excitation card for IEC 60044-1

Param. Description Results displayed for

IEC 60044-1 protection CTs metering

x

P

x

PR PX

CTs

V-kn

I-kn

Ls

Lm

Ts

Kr

ε i

ALF

ALFi

FS

FSi

Kx

Ek

Ie

E1

Ie1

Knee point voltage (acc. to standard) of the topmost knee point found.

Knee point current (acc. to standard) of the topmost knee point found.

Saturated inductance.

Non-saturated inductance.

Secondary time constant.

Remanence factor.

Indirect error (acc. to standard).

Accuracy limiting factor according to

IEC 60044-1 direct measurement method, calculated for nominal and operating burden.

1


IEC 60044-1 indirect measurement method, calculated for nominal and operating burden.

1

Instrument security factor according to

IEC 60044-1 direct measurement method, calculated for nominal and operating burden.

1



1

Dimensioning factor (acc. to IEC 60044-1 class

PX) at accuracy limit with the selected load.

Accuracy limiting voltage according to

IEC 60044-1 for class PX (that point on the excitation graph where an increase of the e.m.f. r.m.s. voltage (core flux) by 10% causes an increase of the r.m.s. current by 50%).

Accuracy limiting current according to

IEC 60044-1 class PX (at E k

).

User-defined e.m.f. to verify the excitation current at this e.m.f.

Max. allowed excitation current at E

1

.

x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x

1. If the

CT Analyzer

is not able to measure up to the actual value, the prefix ">" is displayed to indicate that the measurement value is larger than the displayed value.

x x x x x




V-kn

I-kn

Ls

Lm

Ts

Kr

Kssc

Ktd

V-al

Knee point voltage according to standard.

Knee point current according to standard.




Remanence factor.

Rated symmetrical short-circuit current factor at accuracy limit with the selected load.

1

Theoretical transient dimensioning factor.

Accuracy limiting voltage according to IEC 60044-

6 for class TPS (that point on the excitation graph where an increase of the e.m.f. r.m.s. voltage

(core flux) by 10% causes an increase of the peak current by 100%).

I-al

E1

Accuracy limiting current according to IEC 60044-

6 class TPS (at V al

).


Ie1 Max. allowed excitation current at E

1

.

E-max Maximum e.m.f. voltage.

This parameter allows the determination of the working point on the excitation curve that would be reached with the entered settings.

Peak instantaneous error at voltage E max

.

x x x x x

Results displayed for

IEC 60044-6, class

TPS TPX TPY TPZ

x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x

1. If the

CT Analyzer


111

112




IEC 61869-2 protection CTs, class

Ts

Kr

ε i

FS

V-kn

I-kn

Ls

Lm

FSi

ALF

ALFi

Kx

Ek

Ie

E1

Ie1

Kssc






Remanence factor.

Indirect error (acc. to standard).


IEC

61869-2

direct measurement method, calculated for nominal and operating burden.

1



1


IEC

61869-2

direct measurement method, calculated for nominal and operating burden.

1


IEC

61869-2

indirect measurement method, calculated for nominal and operating burden.

1

Dimensioning factor (acc. to IEC

61869-2

) at accuracy limit with the selected load.

Accuracy limiting voltage according to

IEC

61869-2

(that point on the excitation graph where an increase of the e.m.f. r.m.s. voltage

(core flux) by 10% causes an increase of the r.m.s. current by 50%).

Accuracy limiting current according to

IEC

61869-2

(at E k

).


Max. allowed excitation current at E

1

.

Rated symmetrical short-circuit current factor at accuracy limit with the selected load.

1, 2 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x



IEC 61869-2 protection CTs, class

Ktd

Theoretical transient dimensioning factor.

3

E-max Maximum e.m.f. voltage.

This parameter allows the determination of the working point on the excitation curve that would be reached with the entered settings.


.

x x x x x x x

1. If the

CT Analyzer


2. If parameter "Spec." is set to "by Duty" in the

CT-Object

card (see page 93), no calculation is

performed for this parameter if the user did not specify values for T p card prior to the test.

and t al1

in the

CT-Object

3. This parameter is only displayed if parameter "Spec." is set to "by Duty" in the

CT-Object

card

(see page 93). No calculation is performed for this parameter if the user did not specify values

for T p

and t al1

in the

CT-Object

card prior to the test.

Test results displayed in the Excitation card for IEEE C57.13


Ts

Kr

Vb

FS

V-kn

I-kn

Ls

Lm

FSi






Remanence factor.


Instrument security factor (direct measurement method), calculated for nominal and operating burden.

1

Instrument security factor (indirect measurement method), calculated for nominal and operating burden.

1

Results displayed for

IEEE C57.13

protection

CTs metering

CTs

x x x x x x x x x x x x x x x

1. If the

CT Analyzer


113

114


6.6.4

Excitation Graph

The excitation graph page shows the graph calculated from the test results. To display the excitation graph, press the

Excit. Graph

soft key in the

Excitation

card. The graph shows the r.m.s. terminal/core voltage over the r.m.s./peak current depending on the selected standard.

On the bottom right of the diagram the voltage, current and inductance values for the selected point in the graph are displayed. The currently selected point in the graph is marked by a horizontal and a vertical dashed line.

In this page it is possible to load the excitation graph of an already saved test from the Compact Flash card in order to compare this graph with the one of the current test.

Figure 6-13 Excitation graph

Definition of axes in the excitation graph for different standards

Standard

IEC 60044-1

IEC 60044-6

IEC 61869-2

IEEE C57.13

1. Calibrated to r.m.s.

Vertical axis

r.m.s. terminal voltage r.m.s. e.m.f. voltage average rectified

1

terminal voltage r.m.s. e.m.f. voltage

Horizontal axis

r.m.s. excitation current peak excitation current r.m.s. excitation current r.m.s. excitation current

Available soft keys

Moves the cursor upwards on the excitation graph.

Moves the cursor downwards on the excitation graph.


Switches off the display of values on the bottom right of the diagram.

If you have switched off the values, this soft key changes to

Text On

to switch the values display on again.

Closes the excitation graph and brings you back to the

Excitation

card.

Moves the cursor to the knee point on the graph according to the selected standard.

If two or more knee points could be found on the graph, this soft key is alternately labelled

Knee Point 1

or

Knee Point 2

, depending on which knee point the cursor is actually positioned to. By pressing the soft key you can switch between knee point 1 and knee point 2.

After opening the excitation graph, the cursor shows the topmost knee point (knee point 1) and the soft key is labelled

Knee Point 2

.

Moves the cursor to the knee point on the reference graph. This soft key is only available if a reference graph is loaded.

If the reference graph loaded has two or more knee points, this soft key is alternately labelled

Ref. Knee Point 1

or


, depending on which knee point the cursor is actually positioned to.

By pressing the soft key you can switch between knee point 1 and knee point 2.

After loading the reference graph, the cursor shows the topmost knee point (knee point 1) and the soft key is labelled


.

Opens the file system card to select a previous test in order to load the excitation curve of this test as a reference curve and compare it with the current one.

The reference curve is displayed as a dotted line in addition to the excitation curve of the actual test. If a reference curve is loaded, the values V ref

, I ref

and L ref

are displayed in addition to the measured values.

Switches off the reference curve from the display. If you have switched off the reference curve, the soft key changes to

Ref. On

to switch the reference curve on again.

This soft key is only available if a reference curve has been loaded.

115

116


By pressing one of these soft keys you can display the measured excitation graph and knee point as defined in the respective standard.

IEEE C57.13

displays the knee point for the 45° tangent. After pressing this soft key, its labeling changes to

IEEE C57.13 (30°)

to enable the display of the knee point for the 30° tangent. 30° is recommended for gapped cores in IEEE C37.110, chapter 4.3.

Note:

The test report only contains the graph for the standard selected in the

CT-Object

card.

Viewing the measured values for different points on the graph

By default, the knee point values are displayed after opening the excitation graph page. However, you can also view the corresponding voltage, current and inductance values for any point on the graph. To select a specific point on the graph,

• either use the soft keys (

Cursor Up

,

Cursor Down

,

Knee Point

)

• or enter a specific voltage or current value using the keyboard:

– Select the desired edit field using the cursor keys.

– Enter the desired voltage or current value using the keyboard.

– Press the key to apply the entered value and read the corresponding values in the respective fields (e.g. "V-meas" and "L-meas" if you have entered a current "I-meas").

Figure 6-14 Entering a current value to display its corresponding voltage and inductance values on the excitation graph


6.6.5

Accuracy Limiting Error Graph*

*

According to the "China Electric Regulations for protection CTs".

To display the AL error graph, press the

AL Error Graph

soft key in the

Excitation

card.

Note:

The "AL Error Graph" function can be switched on or off in the device settings (

Main Menu


Setting Menu

, entry "Accur. Limiting

Error Graph"). If switched off, the AL error graph is not included in the test report.

All standards are supported, except IEC 60044-6 class TPZ.

Figure 6-15 AL error graph

Available soft keys

Moves the cursor upwards on the error graph.

Moves the cursor downwards on the error graph.

Switches off the display of values on the top right of the diagram. If you have switched off the values, this soft key changes to

Text On

to switch the values display on again.

Closes the AL error graph and brings you back to the

Excitation

card.

Moves the cursor to that point on the error graph that corresponds to the nominal burden value defined in the "VA" field of the

CT-Object

card (value entered by the user or determined by the

CT Analyzer

).

Moves the cursor to that point on the error graph that corresponds to the operating burden value defined in the "Burden" field of the

CT-Object

card (value entered by the user or determined by the

CT Analyzer

).

117

118


Viewing the measured values for different points on the graph

By default, the cursor is positioned to the nominal burden values after opening this page.

To select a specific point on the graph:

• Select the desired edit field "K-Value" or "Burden" using the keys and enter the desired value using the keyboard.

cursor

• Press the key to apply the entered value and read the corresponding value in the respective field.


6.7

Ratio Card

The

Ratio

card is only available if it is enabled in the

Select Cards

page (Default

Test Settings or

Select Cards

soft key in the

CT-Object

card).

The ratio test measures the current ratio of the CT considering the operating burden (parameter "Burden" in

CT-Object

card) or the nominal burden

(parameter "VA" in

CT-Object

card).

The results of the ratio test can be found in 3 pages:

• The

Ratio

card (refer to Figure 6-16) shows the polarity, the ratio error and the phase displacement for the primary current and the burden defined in the

CT-Object

card.

If the


soft key is pressed, the page shows the results related to the nominal burden ("VA" parameter in the

CT-Object

card). If the


soft key is pressed, the page shows the results related to the operating burden ("Burden" parameter in the

CT-Object

card).

• The

ratio table

shows the current ratio error for different currents (200% down to 1% of the rated current) at different burden values (depending on the

selected standard, see section 6.7.4 on page 122 and 6.7.5 on page 123).

• The

phase table

shows the phase displacement for different currents at different burden values (depending on the selected standard, see section

6.7.4 on page 122 and 6.7.5 on page 123).

For a better understanding of the test results, the most important settings from the

CT-Object

card are shown once again in the upper part of the

Ratio

card.

Note:

Although the test is not performed with the real current, the test results reflect the current ratio and not the voltage ratio.

Figure 6-16

Ratio

card

119

120


6.7.1


Displays the results related to the operating burden of the CT.

or

Displays the results related to the nominal burden of the CT.

Displays the ratio table (refer to section 6.7.4 on page 122 and 6.7.5 on page 123). In the ratio table it is also possible to display the

values related to the nominal burden or the operating burden of the

CT.

Displays the phase table (refer to section 6.7.4 on page 122 and

6.7.5 on page 123). In the phase table it is also possible to display

the values related to the nominal burden or the operating burden of the CT.

6.7.2

Test Settings

The following settings can be done in the

Ratio

test card.

Parameter

I-p

Description

Primary current for calculation of the ratio error and phase displacement with the burden (operating burden) defined in the

CT-Object

card.

After the test is finished, it is possible to change the value for the primary current. The ratio error and/or the phase error are then recalculated and displayed again. When storing the test results, the currently displayed measurement results are stored.

Changing this value only influences the results displayed in the

Ratio

card (operating burden related values). It does not affect the values displayed in the separate pages for the ratio and phase tables (values related to nominal burden).

Default: Value of I pn


6.7.3

Test Results

The following test results are displayed in the lower part of the

Ratio

card. In addition to the results displayed in the

Ratio

card you can view the ratio and

phase table pages described in section 6.7.4 on page 122 and 6.7.5 on page

123.

N

ε t

Parameter

Ratio

Pol.

ε

C

Phase

RCF

TCF

Description

Current ratio error (in %) at the specified primary current (I p

) and burden.

OK: Polarity OK, phase angle is in the range of 0° ± 45°.

Failed: Wrong polarity of the CT or wrong polarity of the measurement leads.

Composite error in % at the specified primary current (I p

) and operating burden.

This parameter is only displayed if the IEC 60044-1 standard is selected in the

CT-Object

card.

Phase displacement (in minutes) at the specified primary current (I p

) and burden.

Winding turns ratio.

Turns ratio error acc. to IEC 60044-6 class TPS or IEC 60044-1 class PX.

Ratio correction factor.

This parameter is only displayed if the IEEE C57.13 standard is selected in the

CT-Object

card.

Transformer correction factor.

This parameter is only displayed if the IEEE C57.13 standard is selected in the

CT-Object

card.

121


6.7.4

Ratio Table and Phase Table for IEC 60044-1, IEC 60044-6 and IEC 61869-2

To display the ratio table or the phase table, press the

Ratio Table

or

Phase Table

soft key in the

Ratio

card.

If the selected standard is

IEC 60044-1

,

IEC 60044-6

or

IEC 61869-2

, these tables show the ratio error and the phase displacement

• for different current values between 1% and 200% of the rated current, and

• at 100%, 50%, 25% and 12.5% of the

operating burden

defined in the

CT-Object

card ("Burden" parameter), and

• at 100%, 50%, 25% and 12.5% of the

nominal burden

defined in the

CT-Object

card ("VA" parameter) or at 1VA if one of these percentages results in a nominal burden smaller than 1VA.

Use the


or


soft key to display the results related to the operating burden ("Burden" parameter in the

CT-Object

card) or related to the nominal burden ("VA" parameter in the

CT-Object

card).

The ratio table and the phase table contain all measurement points defined in the standards IEC 60044-1, IEC 60044-6 and IEC 61869-2.

Use the cursor keys to scroll through the table columns (1% of rated current to 200% of rated current).

122

Figure 6-17 Displaying the ratio table and the phase table in the

Ratio

card

(for IEC 60044-1, IEC 60044-6 and IEC 61869-2)


Note:

Values that caused a failed assessment are highlighted by black background in the tables. Values without the prefix "!" have guaranteed accuracy. The accuracy of values marked with a "!" in the tables is reduced by factor 2.

Note:

For IEC 60044-1 metering CTs with I sn

= 5A, it is possible to increase the minimum

nominal burden

used for the assessment to 3.75VA in the device settings (

Main Menu


Setting Menu

, entry "Min. VA at M cores Isn 5A"). In this case, the lowest nominal burden value displayed in the ratio table and the phase table is 3.75VA instead of 1VA. Please note that this only applies if the results are displayed with the nominal burden. It has no effect if the results in the ratio table and the phase table are displayed with the operating burden.

6.7.5

Ratio Table and Phase Table for IEEE C57.13

To display the ratio table or the phase table, press the

Ratio Table

or

Phase Table

soft key in the

Ratio

card.

If the selected standard is

IEEE C57.13

, these tables show the ratio error and the phase displacement

• for different current values between 1% and 200% of the rated current.

• at the burden specified in the

CT-Object

card ("VA" or "Burden" parameter) and all burden values defined in the IEEE C57.13 standard that are smaller than the specified burden.

Use the


or


soft key to display the results related to the operating burden ("Burden" parameter in the

CT-Object

card) or related to the nominal burden ("VA" parameter in the

CT-Object

card).

Note:

If the

Assess @ VA

option has been selected for the "Class" parameter of an IEEE C57.13 metering CT in the

CT-Object

card, the tables only show the ratio error and the phase displacement for the burden value specified in the

CT-Object

card.

Note:

If a high accuracy license is available for IEEE C57.13, metering burdens also include the electronic burdens.

The ratio table and the phase table contain all measurement points defined in the IEEE C57.13 standard.

Use the and cursor keys to scroll through the table columns

(1% of rated current to 200% of rated current) and table lines (burden values).

123

124


Note:

Values that caused a failed assessment are highlighted by black background in the tables. Values without the prefix "!" have guaranteed accuracy. The accuracy of values marked with a "!" in the tables is reduced by factor 2.

Figure 6-18 Displaying the ratio table and the phase table in the

Ratio

card

(for IEEE C57.13)


6.8

Assessment Card

The

Assessment


Select Cards

page


Select Cards

soft key in the

CT-Object

card).

Depending on the standard and the type of CT (protection or metering CT), the according parameters are listed.

The column for automatic assessment ("Auto") is automatically filled after the test is finished. The following assessments are possible:

• "OK": The results measured for this parameter comply with the requirements defined by the selected standard and the parameters in the

CT-Object

card.

• "Failed": The results do not comply with the requirements.

• "n/a": No assessment possible due to one of the following reasons:

• Comparison with input parameter is not possible.

• Assessment does not make sense due to incorrect polarity or invalid measurement value.

It is also possible to perform a manual assessment for the individual parameters.

To do this, select the parameter to be assessed using the cursor keys and apply your assessment using the

OK

,

Failed

or

?

soft key.

Figure 6-19

Assessment

card (example)

Note:

Automatic assessment is only performed for the CT behavior at nominal burden ("VA" parameter on the

CT-Object

card). For the CT behavior at operating burden ("Burden" parameter on the

CT-Object

card), no automatic assessment is performed.

125

126


6.8.1

Assessed Parameters

Parameters assessed for IEC 60044-1


ALF

ALFi

Ek

Kx

Accuracy limiting factor (direct measurement method).

Accuracy limiting factor (indirect measurement method).


Dimensioning factor (according to

IEC 60044-1 class PX).

x x

Parameter assessed for IEC 60044-1 protection CTs standard classes OMICRON extension

5P 10P 5PR 10PR PX

Class Accuracy class according to standard.

x x x x x

ε t

Kr

Ts

Rct

Δϕ

ε

ε c

Secondary winding resistance.

Phase deviation.

Current ratio error.

Composite error.

Turns ratio error (incl. in class).

Remanence factor


x x x x x x x x x x x x x x x x x x x x x x x x x x

2P, 3P,

4P, 6P

x x x x

2PR, 3PR,

4PR, 6PR

x x x x x x x x x x x

Ie

Ie1


Max. allowed secondary excitation current at E

1

.

x x



Δϕ

Phase deviation.

ε

FS


Instrument security factor (direct measurement method).

FSi Instrument security factor (indirect meas. method).

Parameter assessed for IEC 60044-1 metering CTs

0.1, 0.2, 0.2s,

0.5, 0.5s, 1 3, 5

x x x x x x x x x




x x x

Parameter assessed for

IEC 60044-6

TPS TPX TPY TPZ

x x x x x x x x x x x x x x x x x x x x x x x x x x x

127

128




Rct

Δϕ

ε

ε c

ε t

Kr



Phase deviation.


Composite error.

Turns ratio error (incl. in class).

Remanence factor

Ts

ALF

ALFi


Accuracy limiting factor (direct measurement method).

Accuracy limiting factor (indirect measurement method).

Ek

Kx

Ie

Ie1


Dimensioning factor (according to IEC 61869-2).


Max. allowed secondary excitation current at E

1

.

Parameter assessed for IEC 61869-2 protection CTs standard classes

5P 10P 5PR 10PR PX PXR

OMICRON extension

2P, 3P,

4P, 6P

2PR, 3PR,

4PR, 6PR

x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x

Param.

Description


Rct Secondary winding resistance.

Δϕ

ε

Phase deviation.


Ktd * Kssc Transient dimensioning factor (K td

) multiplied by the rated symmetrical short-circuit current factor (K ssc

).


.

Ts

Kr


Remanence factor


IEC 61869-2 transient protection CTs

TPX

x

TPY

x

TPZ

x x x x x x x x x x x x x x x x x


Class

Δϕ

ε

FS

FSi

Param.

Description

Accuracy class according to standard.

Phase deviation.


Instrument security factor (direct measurement method).

Instrument security factor (indirect meas. method).

Parameter assessed for IEC 61869-2 metering CTs

0.1, 0.2, 0.2s,

0.5, 0.5s, 1 3, 5

x x x x x x x x x

Parameters assessed for IEEE C57.13



Rct DC winding resistance.

Δϕ

RCF

Phase deviation.

Ratio correction factor.

ε

@ Isn

Current ratio error at secondary current I sn

.

ε

@ 20 * Isn Current ratio error at 20 times the secondary current I sn

.

Vb

Vknee

Vk / Ik

Vk1 / Ik1


Knee point voltage.



1. Acc. to IEEE C57.13 (1993) x x


C T

IEEE C57.13

protection CTs, class

X K

1 meter.

CTs

0.3, 0.6,

1.2

IEEE

C57.13.6

high accuracy metering

CTs

0.15,

0.15s

x x x x x x x x x x x x x x x x x x x x x x x x x

129

130


6.9

Comment Card

The

Comment


Select Cards

page


Select Cards

soft key in the

CT-Object

card).

In the

Comment

card you can enter any text, e.g. additional notes regarding the current test.

Figure 6-20

Comment

card

CT Testing Using the Guesser Function

7

7.1


This chapter provides a detailed description how to run a CT test using the guesser function of the

CT Analyzer

. Follow the sections 7.2 to 7.5 in the given

order.

For reasons of simplicity, the following example only considers a straight forward

CT test without performing a

burden test

, a

primary winding resistance measurement

or a

residual magnetism measurement

.


CT Analyzer



Warning:


CT Analyzer


CT Analyzer

is flashing.


Warning:


CT Analyzer




CT Analyzer

!

Warning:


multi-ratio CT


About the Guesser Function

The guesser function of the

CT Analyzer

is intended as an aid for the user to find out single unknown name plate data of a CT, for example if parts of the CT’s name plate are unreadable. If sufficient other name plate data of the CT are available and specified by the user, this function is often able to reliably determine single missing CT data, for example I prim

, I sec

, class or ratio.

The guesser function cannot release the user from specifying the CT’s name plate data prior to testing. Always specify as many CT data as possible to increase the reliability of the values guessed by the

CT Analyzer

!

Caution:

The data and values determined by the

CT Analyzer

using the guesser function are not guaranteed and have to be verified by the user.

131

132


7.2

7.3

It is possible to configure the guesser function of the

CT Analyzer

in a way that it checks whether the user has entered all necessary values and data relevant for an automatic assessment prior to the test start. The respective parameters are then marked by a star ("*") in the

CT-Object

card. If the user did not enter data for one or more of these parameters, no automatic assessment is performed and the

CT Analyzer

displays an "Assessment not available" message after the test is finished.

This option can be used to avoid an automatic assessment if important parameters were guessed by the

CT Analyzer

and not entered by the user. This behavior can be selected using the "Check "*" settings before start" option in the

default test settings (see section 5.7.3 "Miscellaneous Settings" on page 70).

This settings page also provides an option to enable the display of a corresponding message prior to the test start.

Setting Up and Connecting the CT Analyzer

1. Set up the

CT Analyzer

as described in section 2.2 on page 22.

2. Connect the CT to the

CT Analyzer



connect the

CT Analyzer

for the CT test.


Preparing and Configuring the Test

I/0

1. Proceed as follows to display the

CT-Object

card with a new CT test.

If the

CT Analyzer

is already switched on:

– If necessary, display the

CT-Object


Main

soft key to display the main menu.

– In the main menu, select "New CT Test" and press the

OK

soft key to initialize a new CT test.


CT-Object


If the

CT Analyzer

is switched off:

– Switch the

CT Analyzer

on.

– After the boot process is finished, the green LED is on and the red LED is off.


CT-Object



7.4

Running the Automatic Test

1. After switching the

CT Analyzer

on or after initializing a new test from the main menu, the default

CT-Object

card is displayed.

Figure 7-1 Empty

CT-Object

card after initializing a new test

2. Enter as many name plate data as available. The full set of CT data includes:

I pn

, I sn

, standard, CT type (P/M), class and rated power of the CT (VA).

Note:

If the "Check "*" settings before start" option is enabled in the default

test settings (see section 5.7.3 "Miscellaneous Settings" on page 70), no

automatic assessment will be available if you do not enter data for a parameter that is relevant for assessment. Such parameters are marked by a star "*".

3. Execute the CT test as described in section 4.3 on page 52.

If the "Display warning before start" option is enabled in the default test

settings (see section 5.7.3 "Miscellaneous Settings" on page 70), a warning

is displayed if you did not enter data for a parameter marked by a star "*".

Figure 7-2 "No assessment" warning displayed if you did not enter data for a parameter relevant for assessment

Press

Cont. Test

to continue testing without an automatic assessment. Or press

Cancel Test

and enter data for all parameters marked with a star "*" in the

CT-Object

card and start the test again.

133

134


7.5

7.6



CT-Object

card displays the CT data determined

during the test. Refer to section 4.4 on page 55 for more information.

Disconnection

After the CT test is finished, disconnect the CT under test from the

CT Analyzer

.


CT Analyzer

is off.

Warning:


CT Analyzer



CT Analyzer

.

8

Using the Quick Test Feature


Quick Test

is an optional feature. The functionality described in this chapter is only available if you have purchased a corresponding license. For further information, please contact your OMICRON sales contact or the OMICRON office nearest you.

If your

CT Analyzer

provides a vaild license for

Quick Test

, the functional scope described in this chapter is also available in the

CTA Quick Test

PC software included in the


.

The

Quick Test

feature cannot be used when a

CT SB2

switch box is connected to the remote control interface of the

CT Analyzer

.

Measurements using

Quick Test

are not automatically stopped by the

CT Analyzer

. Such measurements have to be stopped manually.

The

CT Analyzer

possibly switches off its output automatically after a long period (> 15 min) of continuous operation at its maximum output power to prevent thermal overload of the device.

135

136


8.1

Safety Notes and Notes for Using Quick Test

Warning:

For VT ratio measurement, the

CT Analyzer

output has to be connected to the primary side of the VT. Connecting the

CT Analyzer


Warning:

Using the DC current mode of the Advanced measurement type may be very dangerous! It is not possible to interrupt the circuit using a standard relay or a standard circuit breaker. Due to the arc, contact clearances of up to

10mm are required to switch off the current.

Warning:

Feeding an inductance with DC current will charge the inductance.

The

CT Analyzer

does not perform automatic discharge of the inductance after measurements with

Quick Test

. Risk of electric shock! Wait until the inductance has discharged completely before touching any connections or disconnecting the measurement leads of the

CT Analyzer

.

Caution:

When using

Quick Test

, input "Sec" of the

CT Analyzer

is able to measure voltages up to 150V

RMS

. Do not connect voltages above 150V or even mains voltages to the

CT Analyzer

inputs! This will damage the

CT Analyzer

!

Caution:

When performing measurements on CTs using

Quick Test

, consider that the

CT Analyzer

does not perform automatic demagnetization of the CT.

Therefore, it may be necessary to additionally run a normal CT test with its automatic demagnetizing cycle following

Quick Test

measurements for a CT.


8.2

Introduction to Quick Test

Using

Quick Test

it is possible to use the

CT Analyzer

as a versatile multimeter with included power source or to perform polarity checks using the

CPOL

polarity checker from OMICRON.

Possible fields of application for

Quick Test

are:

• Quick and easy resistance measurement, e.g. for wiring checks on the secondary side of CTs.

• Quick voltage ratio checks for VTs.

• Measurement of burden values, e.g. to determine the new burden value after changes of the relay equipment. This allows the re-calculation of the CT test results for the new burden value by the

CT Analyzer

and thus makes it unnecessary to run an additional CT test in order to determine the behavior of the CT with the new burden.

• Quick wiring checks using the

CPOL

polarity checker from OMICRON. Using the

CPOL

in combination with the specific test signal provided by the

CT Analyzer

’s

Quick Test

feature you can check a series of test points (e.g., the connecting terminals of the burden wiring) for correct polarity.

The user interface of

Quick Test

consists of two test cards, the

CT-Quick

card containing the measurement parameters and the

Results

card showing the

results of the measurement. Figure 8-1 shows the test cards for a resistance

measurement as an example.

Figure 8-1

CT-Quick

test card (left) and

Results

test card (right) for resistance measurement

Note:

For a general description of the

CT Analyzer

user interface and basic procedures how to operate the

CT Analyzer

and the

Quick Test

tool, please

refer to chapter 5 on page 59.

To select a measurement type, use the cursor key to move the cursor to the

Measurement Type

field in the

CT-Quick

card and then press the corresponding soft key of the measurement type.

137

138


The following measurement types are available in

Quick Test

.

Meas. type

Advanced

Usage

Provides complete multimeter measurement functionality and free adjustment of all measurement quantities, such as

AC or DC signal output, voltage or current output, output frequency, measurement mode (DC, RMS or frequencyselective) for the input, etc.

For details, please refer to section 8.4 on page 139.

Polarity Check Predefined type, especially intended for polarity checks. The only adjustable measurement quantity is the output current.

Requires the

CPOL

polarity checker from OMICRON.

CT Ratio

VT Ratio

Resistance

Impedance

Reactance


Predefined type, especially intended for quick measurement of CT ratios. Adjustable measurement quantities are the voltage and the frequency of the output signal and the resistance and inductance of the CT to be measured.


Predefined type, especially intended for quick measurement of VT ratios. Adjustable measurement quantities are the voltage and the frequency of the output signal.


Predefined type, especially intended for quick measurement of resistances. The only adjustable measurement quantity is the value of the output current.


Predefined type, especially intended for quick measurement of impedances. Adjustable measurement quantities are the amplitude and the frequency of the current output signal.


Predefined type, especially intended for quick measurement of reactances. Adjustable measurement quantities are the voltage and the frequency of the output signal.



8.3

Performing Measurements with Quick Test

How to get there:

Press the

Main


Main Menu:


OK

soft key

->

CT-Quick

card

Measurements using

Quick Test

are not automatically stopped by the

CT Analyzer

. Such measurements have to be stopped manually by the user.

Proceed as follows to perform measurements using the

Quick Test

feature:

1. Select

New Quick-Test

from the main menu and press the

OK

soft key to open

Quick Test

. The display then shows the

CT-Quick

card.

Figure 8-2

CT-Quick

card

2. Select the measurement type and connect your test object to the

CT Analyzer

correspondingly (see sections 8.4 to 8.10 below).

3. Define your measurement quantities.

4. Start and stop your measurement by pressing the

I/0

key.

5. After starting a measurement, the

Results

card is displayed automatically, showing the measurement results.

8.4

Advanced Measurement

How to get there:

Press the

Main


Main Menu:


OK

soft key

CT-Quick

card:

Measurement Type:

Advanced

The Advanced measurement type offers complete multimeter measurement functionality and free adjustment of all measurement quantities, such as AC or

DC signal output, voltage or current output, output frequency, measurement mode (DC, RMS or frequency-selective) for the input, etc.

Using the Advanced measurement type it is also possible to use input "Sec" of the

CT Analyzer

as a voltmeter for

measuring external voltages

up to

150V

RMS

with frequencies up to 4kHz.

Caution:

When using

Quick Test

, input "Sec" of the

CT Analyzer

is able to measure voltages up to 150V

RMS

. Do not connect voltages above 150V or even mains voltages to the

CT Analyzer

inputs! This will damage the

CT Analyzer

!

139

140


Figure 8-3

CT-Quick

card and

Results

card for Advanced measurement type

For the Advanced measurement type, all measurement quantities available in the

CT-Quick

card can be adjusted by the user.

For this measurement type, the

CT-Quick

card holds the following measurement quantities:

Parameter

Output

U/I

Amplitude

Description

Output signal type AC or DC or output signal switched off.

Possible values:

AC

or

DC

or

Off

. Default: AC.

Operating mode of the internal signal generator: voltage or current source.

Possible values:

U

(voltage) or

I

(current). Default: Voltage

Warning:

Feeding an inductance with

DC current

will charge the inductance. The

CT Analyzer

does not perform automatic discharge of the inductance. Risk of electric shock! Wait until the inductance has discharged completely before touching any connections or disconnecting the measurement leads of the

CT Analyzer

.

RMS voltage or current value of the output signal.

Possible values:

Mode "AC" and "Voltage": 0 to 40V

Mode "DC" and "Voltage": 0 to 120V

Mode "AC" and "Current": 0 to 5A

Mode "DC" and "Current": 0 to 10A

Default: 1.00V or 1.00A.

Warning: DC current mode is very dangerous!

In this mode, it is not possible to interrupt the circuit using a standard relay or a standard circuit breaker. Due to the electric arc, contact clearances of up to 10mm are required to switch off the current.


f

Parameter

Measurement

Mode

B-width

Description

Frequency of the output signal. Only available for AC voltage or current output.

Possible values: Any value between 5.0 and 400.0Hz or soft keys

16.7Hz

,

50Hz

,

60Hz

or

400Hz

.

Default: 50Hz

Measurement mode.

Possible values:

DC

,

RMS

or

f-sel. filter

. Default: RMS

DC measurement:

Measures the DC part of the signal only.

RMS measurement:

Performs a standard true RMS measurement of the signal.

Frequency selective measurement:

Allows high precision measurement of the fundamental wave of an applied signal. All frequencies outside the output frequency plus/minus the filter bandwidth are supressed by at least 110 dB. This measurement mode is deactivated for output signal type DC.

See also "B-width" below.

Filter bandwidth for frequency selective measurement. Only available for measurement mode

Freq. sel. filter

.

Possible values: 3Hz to 20Hz. Default: 6Hz

Depending on the filter bandwidth selected, the measurement time can differ considerably. The typical time needed for a frequency selective measurement depends on the filter bandwidth as follows:

Filter bandwidth Measurement time

Load

6Hz approx. 4 seconds

Only available for AC signal output.

Setting the

Load

parameter to "on" and specifying the winding resistance and the unsaturated inductance in the fields

R

and

L

will prevent saturation of the connected CT.

The output generator of the

CT Analyzer

then keeps the DC part of the output current at zero using a current regulator permanently running during the output of AC signals.

Possible values:

On

or

Off

. Default: Off

141

142


Parameter

R, L

Description

Only available if

Load

is set to "on".

Winding resistance (R) and unsaturated inductance (L) of the

CT, used by the internal output regulator to prevent saturation of the connected CT (see "Load" above).

Possible values: 0 to 1000

Ω

or 0 to 1000H.

Default: 1.00

Ω

for

R

and 50.00H for

L

If these values are not set correctly for the connected CT, the

CT will saturate sooner or later, depending on the inaccuracy of the values used.

The

upper part

of the

Results Advanced

card (Figure 8-4) displays the

measured values:

Value

Output

Sec

Prim

Description

Internally measured current value and phase of the output signal.

1

Voltage measured at input "Sec".

1

Max. input voltage: 150V

RMS

Measurement is performed according to the measurement mode selected on the

CT-Quick

card.

This input is considered as the phase reference, therefore the phase is always 0.

Value and phase of the voltage measured at input "Prim".

1

Max. input voltage: 30V

RMS

Measurement is performed according to the measurement mode" selected on the

CT-Quick

card.

1. Select the display mode for the current or voltage value using the soft keys:

RMS

,

DC

,

Peak+

(highest positive peak value) or

Peak-

(highest negative peak value).

The

lower part

of the



measurement results calculated from the measured values. In this area, you can freely define which result each single field should display.

Figure 8-4 shows the


card with the default selection for the results fields.


Figure 8-4


card with default selection for the displayed results

The following table lists the calculated results available for the Advanced measurement type. Use the cursor keys to move the cursor to a field and then select the result to be displayed in this field using the available soft keys.

f

Soft key / result

N

Description

Z

Rp, Rs

Xp, Xs cos ϕ

Lp, Ls or

Cp, Cs

Ratio calculated from the values measured at inputs "Sec" and

"Prim".

Impedance, calculated from the amplitude and phase angle of the output signal and the voltage measured at input "Sec".

Use the

Rp/Rs

soft key to switch between R p

and R s

.

Parallel or serial resistance, calculated from the output signal and the voltage measured at input "Sec".

Use the

Xp/Xs

soft key to switch between X p

and X s

.

Parallel or serial reactance, calculated from the output signal and the voltage measured at input "Sec".

Power factor of the measured impedance.

Use the

Lp/Ls

(or

Cp/Cs

) soft key to switch between L p

(C p

) and L s

(C s

).

Parallel or serial inductance or capacitance of the test object, calculated from the output signal and the voltage measured at input "Sec".

The

CT Analyzer

automatically detects whether the test object is an inductance or a capacitance based on the phase angle.

Frequency measured at input "Sec".

143

144


Soft key / result

Crest Out,

Crest Sec,

Crest Prim

Description

Crest factor of the output signal or the signal measured at input sec or input prim.

The crest factor is the peak/rms ratio of a waveform. For a sinusoidal waveform the crest factor is 1.414 ( √ 2). The crest factor may indicate possible signal distortion.

More detailed information can be found at http://en.wikipedia.org/wiki/Crest_factor.

Note:

The results for

R p

,

X p

and

L p

(

C p

) are calculated using the parallel equivalent circuit diagram, the results for the serial equivalent circuit diagram.

R s

,

X s

and

L s

(

C s

) are calculated using

Use the following wiring (examples):

Figure 8-5 Wiring examples for Advanced measurement type


8.5

Polarity Check

How to get there:

Press the

Main


Main Menu:


OK

soft key

CT-Quick

card:

Measurement Type:

Polarity Check

This measurement type is exclusively intended for polarity checks using the

CPOL

polarity checker as described below. Do not use this mode for any other measurements!

Note:

The Polarity Check measurement type requires the

CPOL

polarity checker from OMICRON (order number VEHZ 0650).

Polarity Check is a predefined measurement type, intended especially for checking a series of test points (e.g., the connecting terminals of the burden wiring) for correct polarity. For this purpose, the

CT Analyzer

injects a signal with a special waveform similar to a saw-tooth signal with a different steepness for the rising and the falling slope. The

CPOL

polarity checker from OMICRON checks the polarity of the injected signal and provides a clear indication as to whether the polarity is OK or not.

Checking the polarity using the Polarity Check measurement type is much faster than conventional methods and can easily be performed by a single person.

To select the Polarity Check measurement type, use the cursor key to move the cursor to the


field in the

CT-Quick


Polarity Check

soft key.

Figure 8-6

CT-Quick

card and

Results

card for the Polarity Check measurement type

For the

Polarity Check

measurement type, the

CT-Quick



Output The output signal type is fixed to "AC".

U/I Operating mode of the internal signal generator: voltage or current source. Fixed to "Current".

Amplitude Current value of the polarity check signal. Adjustable by the user.

Possible values: 0 to 7A. Default: 1.00A.

145

146


The

upper part

of the

Results Polarity Check


following values:

Value

Output

Sec

Prim

Description

Internally measured current value and phase of the output signal.

1


1

The higher the resistance of the wiring checked or the current amplitude set on the

CT Analyzer

, the higher the terminal voltage generated by the injected current signal.


Value and phase of the voltage measured at input "Prim".

1

Input "Prim" is not used for the Polarity Check measurement type.

1. Select the display mode for the current or voltage value using the soft keys:

RMS

,

DC

,

Peak+

(highest positive peak value) or

Peak-

(highest negative peak value).

The

lower part

of the


card (Figure 8-7) displays some

quantities of the injected polarity check signal. In this area, you can freely define which quantity each single field should display.

Figure 8-7 shows the


card with the default selection for the fields.

Figure 8-7


card with default selection for the displayed quantities

Use the cursor keys to move the cursor to a field and then select the quantity to

be displayed in this field using the available soft keys. Please refer to page 143

(Advanced Measurement type) for a detailed description of the available quantities (soft keys).


Use the following wiring for the polarity check (example):

CT

Burden

CPOL



CPOL



Figure 8-8 Wiring example for polarity check

Note:

The

CT Analyzer

measures the voltage of the injected signal using input

"Sec". Therefore, you should always connect this input when using the Polarity

Check measurement type. The higher the resistance of the wiring checked (i.e., the burden wiring) or the current amplitude set on the

CT Analyzer

, the higher the terminal voltage generated by this current!

Proceed as follows to perform a polarity check

1. Make sure that the wiring to be checked is disconnected from the

ungrounded side of the CT (see Figure 8-8).


CT Analyzer

to the

wiring to be checked (see Figure 8-8).

3. Open the

Quick Test

measurement function on the

CT Analyzer

.

4. Select the

Polarity Check

measurement type and set the amplitude of the polarity check signal appropriately.

5. Start the polarity check by pressing the

I/0

key on the

CT Analyzer

.

6. The


card displays the measured values as long as the measurement is active.

147

148


7. Use the

CPOL

polarity checker to check the polarity of the wiring (see

Figure 8-8 on page 147).

– If the

CPOL

detects the same signal characteristic at a test point, it considers the polarity as OK, and lights up the green LED.

– If the signal characteristic is inverted, the

CPOL

considers the polarity not

OK, and lights up the red LED.

Warning:

If you detect a wrong polarity in the signal path, stop the

measurement (see step 8) and turn off the

CT Analyzer

first. Only then disconnect the terminals.

– If the

CPOL

does not detect any signal (for example, due to a too small signal magnitude), both LEDs light up at the same time.

– If the wiring to be tested is open (disconnected or interrupted), the

CT Analyzer

indicates by an intermittent beep sound that no output current is flowing.

If you are in doubt whether your measurement is correct, you can confirm it by reversing the probes of the

CPOL

. In that case, the other LED should light up.

8. Stop the measurement by pressing the

I/0

key on the

CT Analyzer

again.

Note:

Please refer to the CPOL User Manual for detailed information about the

CPOL

polarity checker.


8.6

CT Ratio Measurement

How to get there:

Press the

Main


Main Menu:


OK

soft key

CT-Quick

card:

Measurement Type:

CT Ratio

Caution:

CT ratio measurement using

Quick Test

is not a complete CT test!

This measurement only determines the current ratio of CTs. The

CT Analyzer

does not perform automatic demagnetization after the measurement.

This is a predefined measurement type, intended especially for the quick measurement of CT ratios.

To select the CT Ratio measurement type, use the cursor key to move the cursor to the


field in the

CT-Quick


CT Ratio

soft key.

Figure 8-9

CT-Quick

card and

Results

card for CT ratio measurement

For the

CT Ratio


CT-Quick




U/I Operating mode of the internal signal generator: voltage or current source. Fixed to "Voltage".

f

Amplitude RMS voltage of the output signal. Adjustable by the user.

Possible values: 0 to 40V. Default: 1.00V.

Frequency of the output signal. Adjustable by the user.

Possible values: 5.0 to 400.0Hz or soft keys

16.7Hz

,

50Hz

,

60Hz

or

400Hz

.

Load

Default: 50Hz

Fixed to "On".

Setting the

Load

parameter to "on" and specifying the winding resistance and the unsaturated inductance in the fields

R

and

L

will prevent saturation of the connected CT.

The output generator of the

CT Analyzer

then keeps the DC part of the output current at zero using a current regulator permanently running during the output of AC signals.

149

150



R, L Winding resistance (

R

) and unsaturated inductance (

L

) of the

CT, used by the internal output regulator to prevent saturation of the connected CT (see

Load

above).

Possible values: 0 to 1000

Ω

or 0 to 1000H.

Default: 1.00

Ω

for

R

and 50.00H for

L

If these values are not set correctly for the connected CT, the

CT will saturate sooner or later, depending on the inaccuracy of the values used.

The following values are displayed in the

Results CT Ratio

card: f

Value

Output

Sec

Prim

N

Description

Internally measured RMS current value and phase of the output signal.

RMS value of the voltage measured at input "Sec".


RMS value and phase of the voltage measured at input "Prim".

Current ratio of the CT calculated from the voltages measured at inputs "Sec" and "Prim".


Use the following wiring for CT ratio measurement (example):

Figure 8-10 Wiring example for CT ratio measurement


8.7

VT Ratio Measurement

Warning:

For VT ratio measurement, the

CT Analyzer

output has to be connected to the

primary side

of the VT. Connecting the

CT Analyzer


How to get there:

Press the

Main


Main Menu:


OK

soft key

CT-Quick

card:

Measurement Type:

VT Ratio

Caution:

VT ratio measurement using

Quick Test

is not a complete VT test!

This measurement only determines the voltage ratio of VTs. The

CT Analyzer

does not perform automatic demagnetization after the measurement.

This is a predefined measurement type, intended especially for the quick measurement of VT ratios.

To select the VT Ratio measurement type, use the cursor key to move the cursor to the


field in the

CT-Quick


VT Ratio

soft key.

Figure 8-11

CT-Quick

card and

Results

card for VT ratio measurement

For the

VT Ratio


CT-Quick





f





16.7Hz

,

50Hz

,

60Hz

or

400Hz

.

Default: 50Hz

151

152



Results VT Ratio

card: f

Value

Output

Sec

Prim

N

Description




RMS value and phase of the voltage measured at input "Prim".

Voltage ratio of the VT calculated from the voltages measured at inputs "Sec" and "Prim".


Proceed as follows to perform a VT ratio measurement:


CT Analyzer

to the primary side of the VT and input "Prim" of the

CT Analyzer

to the secondary winding of the VT (see Figure 8-12).

Figure 8-12 Wiring example for VT ratio measurement

Warning:

Hazardous voltages will occur on the primary side of the VT if the

CT Analyzer

output is connected to the secondary side of the VT by mistake!

2. Open the

Quick Test


CT Analyzer

or start the

CTA QuickTest

PC tool from the

CTA Start Page

.


3. Select the

VT Ratio

measurement type. Set the amplitude to the maximum output voltage of 40V and the frequency to the mains frequency. Refer to

Figure 8-13.

Note:

If it is necessary to suppress mains frequency interferences, use the

Advanced

measurement type with a frequency of e.g. 3Hz above the mains frequency (e.g. 53Hz) and choose the frequency-selective measurement mode with a filter bandwidth of 6Hz. Mains frequency interferences are then suppressed by 120 dB.

Measurement settings

Figure 8-13

CT-Quick

test card with settings for VT ratio measurement

4. Start the measurement by pressing the

I/0

key on the

CT Analyzer

or clicking the

ON

button on the

VT Ratio

tab of the

CTA QuickTest

software.

The measured values are displayed and permanently updated as long as the measurement is active. Refer to Figure 8-14.


I/0

key on the

CT Analyzer

again or clicking the

OFF

button on the

VT Ratio

tab of the

CTA QuickTest

software.

Live display of measured values

Live display of VT ratio

Figure 8-14

Results

test card for VT ratio measurement

153

154


8.8

Resistance Measurement

How to get there:

Press the

Main


Main Menu:


OK

soft key

CT-Quick

card:

Measurement Type:

Resistance

This is a predefined measurement type, intended especially for the quick measurement of resistances.

To select the Resistance measurement type, use the cursor key to move the cursor to the


field in the

CT-Quick


Resist.

soft key.

Figure 8-15

CT-Quick

card and

Results

card for resistance measurement

For the

Resistance


CT-Quick



Output The output signal type is fixed to "DC".

U/I Operating mode of the internal signal generator: voltage or current source. Fixed to "Current".

Amplitude Amplitude of the output current. Adjustable by the user.


Warning:

Resistance measurement is performed with

DC current

. Feeding an inductance with DC current will charge the inductance. The

CT Analyzer

does not perform automatic discharge of the inductance. Risk of electric shock!

Wait until the inductance has discharged completely before touching any connections or disconnecting the measurement leads of the

CT Analyzer

.


Results Resistance

card:

Value

Output

Sec

Prim

Rs

Description

Internally measured output current.


Not used for resistance measurement.

Serial resistance, calculated from the output current and the voltage measured at input "Sec".


Note:

The resistance measurement uses the serial equivalent circuit diagram for results calculation.

Use the following wiring for resistance measurement (example):

Figure 8-16 Wiring example for resistance measurement

Proceed as follows to perform winding resistance measurement on VTs:


CT Analyzer

to the

winding to be measured (see Figure 8-16).

2. Open the

Quick Test


CT Analyzer

or start the

CTA QuickTest

PC tool from the

CTA Start Page

.

3. Select the

Resistance

measurement type and set the amplitude of the DC output current appropriately. Refer to Figure 8-17.

Caution:

Use only low currents of e.g. 100mA when measuring the primary side of VTs.

Too high currents could destroy the winding!

Measurement settings

Figure 8-17

CT-Quick

test card with settings for VT winding resistance measurement

4. Start the measurement by pressing the

I/0

key on the

CT Analyzer

or clicking the

ON

button on the

Resistance

tab of the

CTA QuickTest

software. The measured values are displayed and permanently updated as

long as the measurement is active. Refer to Figure 8-18.

155

156



I/0

key on the

CT Analyzer

again or clicking the

OFF

button on the

Resistance

tab of the

CTA QuickTest

software.

Live display of winding resistance

Figure 8-18

Results

test card for VT winding resistance measurement

8.9

Impedance Measurement

How to get there:

Press the

Main


Main Menu:


OK

soft key

CT-Quick

card:

Measurement Type:

Impedance

This is a predefined measurement type, intended especially for the quick measurement of impedances.

To select the Impedance measurement type, use the cursor key to move the cursor to the


field in the

CT-Quick


Imped.

soft key.

Figure 8-19

CT-Quick

card and

Results

card for impedance measurement

For the

Impedance


CT-Quick




V/I Operating mode of the internal signal generator: voltage or current source. Fixed to "Current".

Amplitude RMS value of the output current. Adjustable by the user.



f




16.7Hz

,

50Hz

,

60Hz

or

400Hz

.

Default: 50Hz


Results Impedance

card:

Value

Output

Sec

Prim

Z cos ϕ

Description

Internally measured RMS value and phase of the output current.



Not used for impedance measurement.

Measured impedance, calculated from the magnitude and phase angle of the output signal and the voltage measured at input "Sec".

Power factor of the measured impedance.

Use the following wiring for impedance measurement (example):

Figure 8-20 Wiring example for impedance measurement

157

158


8.10

Reactance Measurement

How to get there:

Press the

Main


Main Menu:


OK

soft key

CT-Quick

card:

Measurement Type:

Reactance

This is a predefined measurement type, intended especially for the quick measurement of reactances.

To select the Reactance measurement type, use the cursor key to move the cursor to the


field in the

CT-Quick


React.

soft key.

Figure 8-21

CT-Quick

card and

Results

card for reactance measurement

For the

Reactance


CT-Quick





f





16.7Hz

,

50Hz

,

60Hz

or

400Hz

.

Default: 400Hz


Results Reactance

card:

Value

Output

Sec

Description





f

Value

Prim

Rs

Xs

Ls or Cs

Description

Not used for reactance measurement.

Serial resistance, calculated from the output signal and the voltage measured at input "Sec".

Serial reactance, calculated from the magnitude and phase angle of the output signal and the voltage measured at input

"Sec".


Serial inductance or capacitance of the test object, calculated from the measured values.

The

CT Analyzer

automatically detects whether the test object is an inductance or a capacitance based on the phase angle.

Note:

The reactance measurement uses the serial equivalent circuit diagram for results calculation.

Use the following wiring for reactance measurement (example):

Figure 8-22 Wiring example for reactance measurement

159

160


CT Analyzer PC Toolset

9

9.1

9.2

CT Analyzer PC Toolset

The


contains a set of PC software that is necessary and helpful for your work with the

CT Analyzer

on a PC.

The following tools are installed with the


:

• CTA Start Page

• CTA QuickTest

• CTA Firmware Update

•

CT Report Tool (Remote Excel File Loader)

with templates for single-ratio CT measurement and multi-ratio CT measurement

• Report Converter (XML to WORD)

• OMICRON Device Browser

• CTA Remote Control

incl. sample software

• CTA remote test sample for Visual Basic (VBA)

• CTA remote test sample for C++

For detailed information about the software of the

CT Analyzer PC Toolset

, please click the "CT Analyzer Help" hyperlink on the

CTA Start Page

.

System Requirements

The software of the


requires the following software installed on the system:

• Operating system:

Windows XP SP3, Windows Vista SP1 32 bit, Windows 7 32 bit,

Windows 7 64 bit.

Note:

Windows XP requires administrative rights for your local machine

• Microsoft Office

®

(required for

CT Report Tool

(Remote Excel File Loader) with

CTA Remote Control

software and

Report Converter (XML to WORD)

):

Office 2002 (XP) SP3, Office 2003 SP3, Office 2007 SP2 or Office 2010.

Installing the CT Analyzer PC Toolset

The


and its installation program

Setup Wizard

are included on the "


" CD ROM accompanying the

CT Analyzer

. Proceed as follows to install the


:

1. Exit all other major programs running on your computer.

161

162


9.3

2. Insert the "


" CD ROM into your computer’s CD ROM drive. The Setup Wizard starts automatically.

Note:

Should the Setup Wizard not start automatically a few seconds after the CD has been inserted into the CD ROM drive, change to the Windows

Explorer and double-click

setup.exe

on the "


"

CD ROM.

3. Follow the instructions displayed on the screen to install the software.

The CTA Start Page

The

CTA Start Page

is the central organizing element for the PC software tools available for the

CT Analyzer

.

There are two ways to launch the

CTA Start Page

:

1. Select

Programs | OMICRON | CT Analyzer | CTA Start Page

in the

Windows

Start

menu.

2. Or double-click the

CTA Start Page

desktop icon.

Figure 9-1 CTA Start Page

In the

CTA Start Page

, click

CT Analyzer Help

to open the help system with detailed information about the software tools of the


.

Technical Data

10 Technical Data

Guaranteed data are specified for an ambient temperature of 23°C ± 5°

(73°F ± 9°), a power supply of 115/230V

AC than 15 minutes.

, and after a warm-up time longer

Guaranteed data are valid for the period of one year after factory adjustment.

10.1

Mains Power Supply

Mains power supply

Connection

Mains voltage

Mains fuses

Connector according to IEC 60320

100 - 240V

AC

/ 50/60Hz / 6A

Instead of supplying the

CT Analyzer

from phaseneutral (L1-N, A-N), it may also be supplied from phase-phase (e.g. L1-L2, A-B). However, the nominal voltage must not exceed 240V

AC

.

2 x T6AH 250V,

(high-breaking capacity wire fuse 5 x 20mm)

10.2

Generator Output

Generator output

Output voltage / current

Output power

AC: 40V rms

/ 5A rms

max.

DC: 120V / 15A max.

400VA rms

max.

10.3

Measurement Inputs

Measurement input "Sec"

Voltage ranges 0 - 0.3 / 3 / 30 / 300V

AC

(auto ranging)

Accuracy 0.1% (guaranteed)

163

164


Measurement input "Sec"

Input impedance

0 - 15V: 1M

Ω

15 - 150V: 500k

Ω

to 1M

Ω

, depending on the voltage. Input current is compensated by the device.

Insulation Reinforced insulation (R) to all other circuits

Measurement input "Prim"

Voltage ranges 0 - 0.03 / 0.3 / 3 / 30V

AC

(auto ranging)

Accuracy

Input impedance

0.1% (guaranteed)

0 - 15V: 330k

Ω

15 - 30V: 120k

Ω

to 330k

Ω

, depending on the voltage.

Insulation Reinforced insulation (R) to all other circuits

10.4

Winding Resistance Measurement Accuracy

Winding resistance measurement accuracy

Resolution

1m

Ω

Accuracy 0.05% (typical)

0.1% + 1m

Ω

(guaranteed)

10.5

Ratio and Phase Measurement Accuracy

The values given in the following table are only valid under the following conditions:

• All utility lines to the primary side of the CT are disconnected.

• One terminal of the primary side of the CT is connected to PE.

• The original measurement cables delivered by OMICRON for the

CT Analyzer

are used.

• The CT under test is a CT with a non-gapped core.

• The knee point voltage according to IEEE C57.13 is > 3V.

Under interfering conditions the device has reduced accuracy.

Technical Data

Values without the prefix "!" in the ratio table of the

Ratio

card have guaranteed accuracy. The accuracy of values marked with a "!" in the table is reduced by factor 2 since these values are not directly measured but calculated from the measured values instead.

Ratio measurement accuracy for 1 A CTs at rated current

CT ratio I sn

Rated power

1

Typical accuracy

0.2 - 1

> 1 - 2000

1

1

1.0 - 30VA

0 - 30VA

0.05%

0.02%

> 2000 - 5000

> 5000 - 10000

1

1

0 - 30VA

0 - 30VA

0.03%

0.05%

1. Nominal burden of the CT.

Guaranteed accuracy

0.1%

0.05%

0.1%

0.2%

Ratio measurement accuracy for 5 A CTs at rated current

CT ratio I sn

Rated power

1

Typical accuracy

0.2 - 1

> 1 - 2000

5

5

1.0 - 75VA

0 - 75VA

0.05%

0.02%

> 2000 - 5000

> 5000 - 10000

5

5

0 - 75VA

0 - 75VA

0.03%

0.05%

1. Nominal burden of the CT.

Guaranteed accuracy

0.1%

0.05%

0.1%

0.2%

Phase measurement accuracy at rated current

Resolution 0.01min

Accuracy (cos ϕ

0.8 - 1)

1min (typical)

3min (guaranteed)

Turns ratio measurement accuracy

Resolution 0.01 turns

Accuracy 0.05% (typical)

0.1% (guaranteed)

165


166

10.6

Compact Flash Card Interface

Compact Flash card interface

Card type CF type 1

Allowed memory size 16MB - 2GB

10.7

Remote Control Interface

The remote control interface of the

CT Analyzer

is exclusively intended to connect the

CT Analyzer

to a computer (e.g. running the

CT Analyzer PC

Toolset

software) or to the optional

CT SB2

switch box (for multi-ratio CT measurement).

As of serial number JHxxxx or newer, the

CT Analyzer

is equipped with a USB interface and a RS232 interface.

Note:

The user has to select the interface to be used in the

CT Analyzer

settings before connecting the

CT Analyzer

to a computer (refer to section 2.3 on page 23). The

CT Analyzer


CT Analyzer


10.7.1

RS232 Interface

The RS232 interface can be used to connect the

CT Analyzer

to a computer or to the optional

CT SB2

switch box.

9-pole SUB-D connector, male

Figure shows outside view onto the pins at the

CT Analyzer

!

6 nc

7 RTS (out)

8 CTS (in)

9 + 5V

Do not connect!

For internal use only!

Housing: Shield (ground)

1 nc

2 RxD (data in / receive)

3 TxD (data out / transmit)

4 nc

5 GND (signal ground)

Figure 10-1 Pin assignment for RS232 remote control interface

Technical Data

9-pole (DB9) null modem or crossover cable, 2 x female

Connections required:

1 2 3 4 5 6 7 8 shield

1 2 3 4 5 6 7 8 shield

Figure 10-2 Connection cable for RS232 remote control interface

10.7.2

USB Interface

The USB interface can be used to connect the

CT Analyzer

to a computer.

Communication via USB is considerably faster than communication via RS232.

USB interface

(type B connector)

Figure 10-3 USB remote control interface (standard type B connector)

10.8

Environmental Conditions

10.8.1

Climate

Climate

Operating temperature

Storage and transportation

Max. altitude

Humidity

–10 … +50°C (14 … 122°F)

–25 … +70°C (–13 … 158°F)

2000m

5 … 95% relative humidity, non-condensing

Tested acc. to IEC 60068-2-78, Cab,

Damp Heat: Temp. 40°C, duration 48 h, rel. humidity 95%

167

168


10.8.2

Shock and Vibration

Dynamics

Vibration

Shock

Tested according to IEC 60068-2-6; frequency range 10 … 150 Hz; acceleration

2g continuous (20 m/s

2

); 20 cycles per axis

Tested according to IEC 60068-2-27

(operating mode); 15g / 11ms, half-sinusoid,

3 shocks in each axis

10.8.3

Mechanical Data

Weight, Dimensions and Protection

Weight

Dimensions W x H x D

< 8kg (17.6lbs) without accessories

360 x 285 x 145mm

(14.2 x 11.2 x 5.7")

10.8.4

Safety Standards, Electromagnetic Compatibility (EMC)

CE Conformity, Requirements

The product adheres to the specifications of the guidelines of the Council of the European Community for meeting the requirements of the member states regarding the electromagnetic compatibility (EMC) Directive 2004/108/EC and the low-voltage Directive 2006/95/EC.

EMC

Emission

EN 61326-1 Class A

IEC 61326-1 Class A

FCC Subpart B of Part 15 Class A

Europe

International

USA

Immunity

Europe

International

Certified Safety Standards

Europe

International

USA

EN 61326-1

IEC 61326-1

EN 61010-1

IEC 61010-1

UL 61010-1

User Maintenance

11 User Maintenance

11.1

Care and Cleaning

The

CT Analyzer

does not require any special maintenance or care. Clean the device from time to time or as necessary using a cloth dampened with water or isopropanol alcohol. Always disconnect the

CT Analyzer

prior to cleaning!

11.2

Replacing Fuses

1. Turn off the

CT Analyzer

and unplug the power cord.

2. Ground the test object, and disconnect it from the

CT Analyzer

. By disconnecting it you prevent a possibly faulty test object from feeding power back into the

CT Analyzer

.

3. Locate the blown fuse on the side panel of the

CT Analyzer

and replace it by an identical fuse type: T6.3H 250 V (6.3 Amps slow-acting high breaking capacity wire fuse 5 x 20mm). The

CT Analyzer

has two fuses of the same type.

11.3

Calibrating the CT Analyzer

OMICRON offers a reference CT (calibration CT VEHZ0649) to verify the calibration of the

CT Analyzer

. This reference CT is delivered together with a calibration certificate of a national test laboratory.

The calibration CT has a ratio of 2000:1 and 2000:5. Its class is 0.02.

To verify the calibration of the

CT Analyzer

, it is necessary to measure both ratios (2000:1 and 2000:5). The

CT Analyzer

is within the specifications, if all measurement results are within class 0.02.

If the measurement results are not within class 0.02, we recommend to send the

CT Analyzer

back to OMICRON for calibration in order to guarantee proper operation in accordance with the regulations.

169

170


Error and Warning Messages

12 Error and Warning Messages

001.xxx

Error [001] No valid CT software!

Reason:

Solution:

No valid software in the device Flash memory or incorrect checksum.

Insert a Compact Flash card with valid software (

CTAnalyzer.bin

) in the

Omicron

directory and switch the

CT Analyzer

off and on again.

002.xxx

Error [002] Can't open file!

Reason: The firmware cannot read the file

CTAnalyzer.bin

from the Compact Flash

Solution: card since the CF card or the file is missing.


CTAnalyzer.bin

) in the

Omicron


CT Analyzer

off and on again.

003.xxx

Error [003] Download error!

Reason: The downloaded software is corrupt.

Solution: Insert a Compact Flash card with valid software (

CTAnalyzer.bin

Omicron


CT Analyzer

off and on again.

) in the

100.xxx

Warning [100.xxx] CT resistance > 3000 Ohms.

Reason:

Solution:

The resistance measured during primary or secondary winding resistance measurement is > 3000

Ω

.

The test cannot be continued. Check the connections to the CT. If the connections are ok, the CT resistance is > 3000

Ω

. Such CTs cannot be tested using the

CT Analyzer

.

101.xxx

Warning [101.xxx] Timeout during measurement. No constant winding resistance can be determined within 10 sec.

Reason:

Solution:

The

CT Analyzer

cannot determine a constant winding resistance within

10sec. during primary or secondary winding resistance measurement.

The test cannot be continued. Check the connections to the CT.

110.xxx

Warning [110.xxx] The impedance of the CT is too high.

Reason: The impedance of the CT or the load is too high to reach the minimum toggle

Solution: frequency of 0.2Hz / 0.8Hz.

The test cannot be continued. Check the connections to the CT. If the connections are ok, it is not possible to test this CT due to its too high inductance.

111.xxx

Warning [111.xxx] Inductance of load too low.

Reason: Measurement frequency is too high and cannot be decreased because of too

Solution: low CT inductance.

The test cannot be continued. Check the connections to the CT. If the connections are ok, it is not possible to test this CT due to its too low inductance.

112.xxx

Warning [112.xxx] Measurement error, reduce noise level.

Reason: It is not possible to obtain stable measurement results due to incorrect wiring,

Solution: wiring short-circuit, connected load or external interferences.

Check the wiring. The primary side of the CT must not be short-circuited.

Disconnect the primary side of the CT from the transmission lines, connect one primary side terminal to PE and open the other one. Use the delivered original

coax cables for measurement (see section 2.7.2 ”Noise Reduction

Techniques” on page 43). Make sure that no burden is connected to the

secondary side of the CT. This error may also indicate a winding short circuit of the CT.

171

172


113.xxx

Warning [113.xxx] Test not successful. Kneepoint not found.

Reason: Knee point for specified standard not found.

Solution: The current required to reach the knee point for the specified standard cannot be delivered. The CT cannot be tested up to the knee point voltage.

114.xxx

Warning [114.xxx] Low inductance detected during excitation measurement.

Reason:

Solution:

Low inductance was measured during the excitation test.

Verify that the primary side of the CT is not short-circuited.

This warning can also occur for CTs with very low excitation loss and high parasitic capacitance.

115.xxx

Warning [115.xxx] Invalid eddy loss measurement.

Reason: Reliable determination of the eddy losses is not possible.

Solution: Verify the wiring and repeat the test. If the error message is displayed repeatedly, it is currently not possible to test this CT using the

CT Analyzer

.

116.xxx

Warning [116.xxx] Knee point too low! CTs with a knee point below 1 volt are not supported.

Reason:

Solution:

The knee point voltage is smaller than 1 V.

Currently it is not possible to test CTs with such a low knee point using the

CT Analyzer

.

121.xxx

Warning [121.xxx] Test not successful! Reverse polarity. Check wiring and repeat the measurement.

Reason: Measured polarity is wrong.

Solution: Reverse the polarity of the measurement cables on the primary or secondary side of the CT.

130.xxx

Warning [130.xxx] Burden impedance > 1kOhm.

Reason:

Solution:

Burden impedance > 1k

Ω

.

The test cannot be continued. Check the connections to the Burden.

131.xxx

Warning [131.xxx] Overload during Burden measurement.

Reason: The required test current cannot be reached, even at the maximum output voltage.

Solution: The

CT Analyzer

cannot deliver enough current. Reduce the test current or the impedance of the burden. Check the wiring for proper contacts; one connection possibly has a bad connection.

140.xxx

Warning [140.xxx] Timeout during remanence test. Measured magnetic flux is unstable.

Reduce noise level.

Reason: The magnetic flux during remanence measurement is not stable.

Solution: The test cannot be continued. Check the connections to the CT. Try to reduce the noise level for the measurement.

200.xxx

Warning [200.xxx] Check connection. Make sure burden is properly wired.

Reason: The measured input voltage differs by more than 5V from the input voltage

Solution: expected during burden test.

Check whether the output generator ("Output") and measurement input "Sec" are connected correctly.

200.xxx

Warning [200.xxx] Check CT SB2 switch box wiring: CTA OUTPUT and/or BURDEN terminal may be disconnected.

Reason:

Solution:

The measured input voltage differs by more than 5V from the input voltage expected during the burden test using the

CT SB2

switch box.

Check whether the BURDEN OUT and the BURDEN IN sockets on the

CT SB2

are connected correctly.


201.xxx

Warning [201.xxx] Check connection. Measured ratio > 50000:1.

Reason: Measurement input "Prim" is possibly not connected properly.

Solution: Check whether the primary side measurement input "Prim" is connected properly.

202.xxx

Warning [202.xxx] Check connection. Polarity of input SEC and power output are not the same.

Reason:

Solution:

Polarity of input "Sec" and "Output" are not the same.

Check whether the output generator ("Output") and measurement input "Sec" are connected properly and with correct polarity.

203.xxx

Warning [203.xxx] Check connection. Input SEC may be disconnected.

Reason: Input signal at input "Sec" differs from the expected one.

Solution: Check whether the output generator ("Output") and measurement input "Sec" are connected properly.

204.xxx

Warning [204.xxx] Check connection. Polarity of input PRIM and power output are not the same.

Reason: Input signal at input "Prim" differs from the expected one: Reverse polarity at input "Prim".

Solution: Check whether the output generator ("Output") and measurement input "Prim" are connected properly and with correct polarity.

204.xxx

Warning [204.xxx] Check CT SB2 switch box wiring: Wrong polarity at PRIM terminal.

Reason: Input signal at input "PRIM" differs from the expected one: Reverse polarity at

Solution:

CT SB2

input "PRIM".

Check whether the PRIM IN sockets on the

CT SB2

are connected properly and with correct polarity. If necessary, connect with changed polarity.

205.xxx

Warning [205.xxx] Check connection. Input PRIM may be disconnected.

Reason:

Solution:

Input signal at input "Prim" differs from the expected one.

Check whether the output generator ("Output") and measurement input "Prim" are connected properly.

205.xxx

Warning [205.xxx] Check CT SB2 switch box wiring: PRIM IN terminal may be disconnected.

Reason:

Solution:


Check whether the PRIM IN sockets on the

CT SB2

are connected properly.

206.xxx

Warning [206.xxx] Check connection. Ensure that the output is connected to the primary side of the CT.

Reason: Input signal at input "Prim" differs from the expected one.

Solution: Check that the output generator ("Output") is connected to the CT and that the primary side of the CT is connected to input "Prim".

206.xxx

Warning [206.xxx] Check CT SB2 switch box wiring: CTA OUTPUT and/or PRIM OUT terminal may be disconnected.

Reason:

Solution:


Check whether the PRIM OUT and the PRIM IN sockets on the connected correctly to the primary side of the CT.

CT SB2

are

207.xxx

Warning [207.xxx] Check connection! OUTPUT may be disconnected.

Reason: The current signal differs from the expected one.

Solution: Check whether the output generator ("Output") and measurement input "SEC" are connected properly to the secondary side of the CT.

173

174


210.xxx

Warning [210.xxx] Permanent data overflow.

Reason: Internal data buffer overflow. The data could not be fetched fast enough from

Solution: the internal data buffer.

Try to repeat the measurement. If this error occurs more frequently, you should contact your next OMICRON service center.

211.xxx

Warning [211.xxx] AC mode measurement timeout.

Reason: Measurement timeout due to frequent range switching or invalid data from the

Solution: measurement inputs.

Check the wiring and repeat the measurement. Try to reduce noise for the measurement.

220.xxx

Warning [220.xxx] Test aborted!

Reason:

Solution:

The test sequence has been interrupted by the user.

Repeat the test without interrupting it.

308.xxx

Note [308.xxx] I-sn value has to be specified in CT-Object Card prior to Residual

Magnetism test!

Reason:

Solution:

For the remanence test the I sn

Enter valid I sn

value should be defined.

value before starting the remanence test.

310.xxx

Note [310.xxx] License: <Guesser functionality> is missing! Values for: Ipn, Isn, P/M,

Class, FS/ALF should be provided.

Reason:

Solution:

The license required for class guessing is not available.

Specify the values for I pn

, I sn

, Class, P/M and FS/ALF before starting the test.

311.xxx

Warning [311.xxx] License: <Simulation after test> is missing!

Reason: The license required for simulation is not available.

Solution: Simulation of the results for changed test settings (e.g. different burden values) after the test is not possible. Purchase a corresponding license.

312.xxx

Warning [312.xxx] License: <...> is missing!

Reason: The license specified in the message is not available.

Solution: The functionality included in the license is not available. Purchase a corresponding license.

313.xxx

Warning [313.xxx] License: <All languages> is missing! Test can be performed only if the Chinese user interface is set.

Reason:

Solution:

The license required to use all languages is not available.

Perform the test with the Chinese user interface or purchase a corresponding license.

318.xxx

Warning [318.xxx] License: <Burden guesser> is missing! Values for VA, Burden, Cos

ϕ

should be provided.

Reason: The license required for the burden guesser functionality is not available.

Solution: Specify the values for nominal and operating burden (VA, Burden and cos ϕ

) or purchase a corresponding license.

319.xxx

Warning [319.xxx] License: <Quick test> is missing!

Reason: The license required for the Quick Test functionality is not available.

Solution: Purchase a corresponding license if you want to perform measurements using

Quick Test.

331.xxx

Note [331.xxx] Ipn is invalid! The value must be between the Ipn values of the neighboring taps.

Reason:

Solution:

An invalid I pn

value has been entered to the

Enter a valid I pn

value.

MR-Config.

card.


332.xxx

Note [332.xxx] I-sn has to be specified. Vb and VA are calculated dependent on I-sn.

Reason:

Solution:

You tried to enter values for V b

or VA without specifying the I

Enter a valid I sn

value before specifying values for V b sn

and VA.

value first.

333.xxx

Note [333.xxx] First define I-pn for this tap.

Reason: You tried to enter a nominal burden (VA) value for a tap without specifying the

Solution:

I pn

for this tap first.

Enter a valid I pn

value for the tap before specifying the nominal burden (VA).

334.xxx

Note [334.xxx] Test cannot be started. Nominal burden (VA) should be >= 3.75VA.

Reason: The nominal burden (VA) entered is lower than the limit specified in the device

Solution: settings (parameter "Min. VA at M cores Isn 5A").

Enter a nominal burden (VA) higher than or equal to 3.75VA.

356.xxx

Warning [356.xxx] License: <All frequencies support> is missing! Only 60 Hz nominal frequency is supported.

Reason:

Solution:

The license required to use all frequencies is not available.

Measurements are only possible for 60 Hz. Purchase a corresponding license if you want to perform testing with other frequencies.

357.xxx

Note [357.xxx] License: <P cores support> is missing! Only metering CTs can be measured.

Reason:

Solution:

The license required to perform testing of protection cores is not available.

Testing is only possible for metering cores. Purchase a corresponding license if you want to perform testing of protection cores.

358.xxx

Warning [358.xxx] License: <M cores support> is missing! Only protection CTs can be measured.

Reason:

Solution:

The license required to perform testing of metering cores is not available.

Testing is only possible for protection cores. Purchase a corresponding license if you want to perform testing of metering cores.

360.xxx

Note [360.xxx] No class assessments will be made, because one or more of the settings marked by a star ('?*' or '*') "are not defined.

Reason: Some of the assessment-relevant settings are not defined.

Solution: Make sure that all settings that are relevant for assessment (marked by '?*' or

'*') are defined.

400.xxx

Warning [400.xxx] You cannot make a multi-ratio measurement without a CT SB2 switch box!

Reason:

Solution:

No

CT SB2

is connected when starting a multi-ratio measurement.

Connect the

CT SB2

to the

CT Analyzer

before starting a multi-ratio test.

401.xxx

Warning [401.xxx] CT SB2 switch box is disconnected!

Reason: The

CT SB2

is not properly connected to the

CT Analyzer

.

Solution: Restore proper connection between the restart your test.

CT SB2

and the

CT Analyzer

and

402.xxx

Warning [402.xxx] CT SB2 switch box communication error.

Reason: Communication between the

CT SB2

and the

CT Analyzer

failed.

Solution: Restore proper connection between the

CT SB2

and the

CT Analyzer

and restart your test.

175

176


403.xxx

Warning [403.xxx] Check CT SB2 switch box wiring: CTA OUTPUT, TAPS XN and/or X1 may be disconnected.

Reason:

Solution:

The CTA OUTPUT sockets of the

CT SB2

are not properly connected to the

CT Analyzer

output.

Make sure that the CTA OUTPUT sockets on the

CT SB2

are properly connected to the

CT Analyzer


404.xxx

Warning [404.xxx] Check CT SB2 switch box wiring: CTA PRIM and/or PRIM IN terminal may be disconnected.

Reason:

Solution:

The CTA PRIM sockets of the

CT SB2

are not properly connected to

CT Analyzer

input PRIM.

Make sure that the CTA PRIM sockets on the

CT SB2

are properly connected to

CT Analyzer

input PRIM and restart your test.

405.xxx

Warning [405.xxx] Check CT SB2 switch box wiring: CTA SEC terminal, TAPS XN IN and/or X1 IN may be disconnected.

Reason:

Solution:

The CTA SEC sockets of the

CT SB2


CT Analyzer

input SEC.

Make sure that the CTA SEC sockets on the

CT SB2


CT Analyzer

input SEC and restart your test.

406.xxx

Warning [406.xxx] Check CT SB2 switch box wiring: <text depending on connection actually detected>

Reason:

Solution:

The CTA SEC sockets of the

CT SB2


CT Analyzer

input SEC.

Make sure that the CTA SEC sockets on the

CT SB2


CT Analyzer

input SEC and restart your test.

407.xxx

Warning [407.xxx] Check CT SB2 switch box wiring: Wrong polarity at CTA SEC or CTA

OUTPUT terminal

Reason:

Solution:

Reverse polarity at the CTA SEC sockets or the CTA OUTPUT sockets of the

CT SB2

.

Make sure that the CTA SEC sockets and the CTA OUTPUT sockets on the

CT SB2


CT Analyzer


408.xxx

Warning [408.xxx] Check CT SB2 switch box wiring: <text depending on missing connection actually detected>

Reason:

Solution:

At least one of the CT taps enabled for multi-ratio testing is not connected to the

CT SB2

correctly.

Make sure that all CT taps are connected correctly to the TAPS terminals on the

CT SB2


409.xxx

Warning [409.xxx] Check CT SB2 switch box wiring: <text depending on incorrect connection actually detected>

Reason:

Solution:

Wiring of at least two CT taps is mixed, e.g. CT tap X2 is connected to TAPS X3 on the

CT SB2

and vice versa.

Make sure that all CT taps are connected to the correct TAPS terminals on the

CT SB2


411.xxx

Warning [411.xxx] Firmware download to switch box failed! Error: SBErrNo

Reason:

CT SB2

firmware download failed.

Solution: Ensure that the

CT SB2

is connected to the firmware download to the

CT SB2

.

CT Analyzer

and repeat the


415.xxx

Warning [415.xxx] Quick measurement cannot be started. Please disconnect the

CT SB2 switch box.

Reason:

Solution:

You are trying to initiate a

Quick

measurement with the

CT SB2

switch box still connected to the

CT Analyzer

.

Measurements using

Quick Test

are not possible when the

CT SB2

is connected to the

CT Analyzer

. Remove all connections to the

CT SB2

and restart your

Quick

measurement on the

CT Analyzer

.

501.xxx

No message displayed on the

CT Analyzer

. Message only displayed on remote PC connected to the

CT Analyzer

.

Reason:

Solution:

The remote interface handler couldn't decipher the command.

Remote interface error. Check the connection between

CT Analyzer

and PC.

504.xxx


CT Analyzer


CT Analyzer

.

Reason:

Solution:

Data transmission error.

Check the connection between

CT Analyzer

and PC.

505.xxx


CT Analyzer


CT Analyzer

.

Reason:

Solution:

Data transmission error.

Check the connection between

CT Analyzer

and PC.

510.xxx


CT Analyzer


CT Analyzer

.

Reason: Remote interface error: Failed to get the required measurement data because the measurement is still running.

Solution: Check the connection between

CT Analyzer

and PC.

511.xxx


CT Analyzer


CT Analyzer

.

Reason: Remote interface error: Failed to unzip the transmitted data block.

Solution: Check the connection between

CT Analyzer

and PC.

513.xxx


CT Analyzer


CT Analyzer

.

Reason:

Solution:

The current remote interface command is not allowed.

Make sure that the current

CT Analyzer

state allows the execution of the command.

514.xxx


CT Analyzer


CT Analyzer

.

Reason: Remote interface error: Remote command was submitted with an invalid parameter.

Solution: Verify the parameter (index) submitted with the remote interface command.

800.xxx

Warning [800.xxx] Flash card access error. Internal file system error.

Reason:

Solution:

The file system sent an error message.

Compact Flash card is possibly corrupt. Use a new Compact Flash card.

801.xxx

Warning [801.xxx] Flash card access error. Invalid file name or path.

Reason: The file system sent an error message.

Solution: The Compact Flash card is possibly corrupt. Try to save the data to a PC and format the CF card.

177

178


802.xxx

Warning [802.xxx] Flash card access error. Access denied.

Reason: The file system sent an error message. You tried to open a "read only" file or a

Solution: special directory.

Access the Compact Flash card on a PC and remove the "read-only" file attribute. File attributes cannot be modified with the

CT Analyzer

.

803.xxx

Warning [803.xxx] Flash card access error. File or folder already exists.


Solution: Enter a different file or folder name.

804.xxx

Warning [804.xxx] Flash card access error. Disk full.


Solution: Delete some files on the Compact Flash card or insert a new CF card.

805.xxx

Warning [805.xxx] Flash card access error. No or corrupt flash card.

Reason: No or no valid CF card can be found.

Solution: Insert a valid Compact Flash card.

806.xxx

Warning [806.xxx] Flash card access error. Corrupt directory structure.

Reason:

Solution:

The file system sent an error message.

Try to backup the data on the Compact Flash card to a PC and perform formatting of the Compact Flash card.

807.xxx

Warning [807.xxx] Nothing to paste.

Reason: No file(s) selected to paste.

Solution: Select one or more files using the

Copy

or

Cut

function and try again.

808.xxx

Warning [808.xxx] Renaming of folders not supported.

Reason: This action is not supported.

Solution: Renaming of folders is not supported by the

CT Analyzer

.

809.xxx

Warning [809.xxx] Are you sure you want to format the CF card? All data will be lost!

Reason: This warning always appears before formatting of a Compact Flash card is executed, since all data stored on the Compact Flash card will be erased during

Solution: formatting.

Press

Format

to start formatting or

Abort

to cancel the operation without formatting the Compact Flash card.

810.xxx

Warning [810.xxx] File exists. Do you want to overwrite it?

Reason: The file name used to save the data already exists. This warning always appears before overwriting files on the Compact Flash card.

Solution: Enter another file name, if desired.

811.xxx

Warning [811.xxx] Are you sure you want to delete <File Name>?

Reason: This warning always appears prior to the deletion of a file on the Compact Flash

Solution: card.

Press

Yes

to delete the file or

No

to return to the file system card without deleting the file.

812.xxx

Warning [812.xxx] Are you sure you want to delete all selected files?

Reason: This warning always appears prior to the deletion of files on the Compact Flash

Solution: card.

Press

Yes

to delete the files or

No

to return to the file system card without deleting the files.


813.xxx

Warning [813.xxx] One or more parameters could not be found. Some calculations may not work.

Reason:

Solution:

The .xml report file read from the Compact Flash card is of a newer format than the device can generate.

The loaded file is incompatible or the software version on your

CT Analyzer

is older than the software version that has generated the report. To enable your

CT Analyzer

to read this report, it is necessary to update the

CT Analyzer

software.

814.xxx

Warning [814.xxx] You tried to load an old report. One or more parameters could not be found. Some calculations may not work.

Reason: One or more entries could not be found in the .xml report file.

Solution: The software version on the

CT Analyzer

is newer than the software version used to generate the report. The report probably does not contain all parameters supported by the new

CT Analyzer

software.

815.xxx

Error [815.xxx] Folder must be empty. Can't remove folder <Folder Name>.

Reason: The folder selected for deletion is not empty. Only empty folders can be deleted.

Solution: Navigate to the folder you want to delete. Open the folder and delete all contained files and subfolders. Then you can delete the empty folder.

816.xxx

Error [816.xxx] You tried to load a report built with a <Device>.

Reason: The .xml file seems to be not a

CT Analyzer

report.

Solution: The report cannot be loaded by the

CT Analyzer

.

817.xxx

Error [817.xxx] The xml file has no valid OMICRON report style.

Reason:

Solution:

The .xml file has no valid OMICRON report style.

The report cannot be loaded by the

CT Analyzer

.

818.xxx

Warning [818.xxx] Moving of folders not supported.

Reason: Moving of folders is not supported by the

CT Analyzer

.

Solution: Select only files to move, not folders. Using the shift key and the up/down cursor keys it is possible to select any number of files within a folder.

819.xxx

Warning [819.xxx] File name contains an invalid character.

Reason: An invalid character was used to specify the file name.

Solution:

Invalid characters: \ / : * ? \ < > |

Only use valid characters for the file name.

820.xxx

Error [820.xxx] Memory management error. Contact the next OMICRON service center.

Reason: Memory management error.

Solution: Switch the

CT Analyzer

off, wait a second then switch it on again. If this error occurs more frequently, you should contact your next OMICRON service center.

821.xxx

Error [821.xxx] Could not update firmware.

Reason:

Solution:

An error has occurred in the boot loader software.


CTAnalyzer.bin

) in the directory

A:\Omicron\

and switch the

CT Analyzer

off and on again.

823.xxx

Error [823.xxx] Could not update user text!

Reason: An error has occurred in the user text loader software.

Solution: Insert a Compact Flash card with valid software ( directory

A:\Omicron\

and try again.

CTUser_xxx.bin

) in the

179

180


824.xxx

Error [824.xxx] An internal software error has occurred at address xxxxxxxH. To log this error, make sure that a CF card is inserted and then press OK. Please send the file

\OMICRON\ErrorLog.xml on the CF card to the next OMICRON service center.

Reason:

Solution:

Invalid result in a floating point operation (NaN).

Contact your next OMICRON service center.

825.xxx

Warning [825.xxx] Size of file [FileName] >= 1Mbyte.

Reason: The size of the file copied to the

CT Analyzer

Compact Flash card or virtual disc

Solution: is > 1 MB.

Avoid transfer of large files > 1 MB to the

CT Analyzer

.

830.xxx

License < ... > is invalid.

Reason: An invalid license entry was found in the license file

Omicron.lic

on the CF

Solution:

Card.

Specify a valid license key.

831.xxx

Setting value for < ... > is invalid. The default value of < ... > is used.

Reason: Invalid item in file

Settings.inf

.

Solution: The file

Settings.inf

in the

Omicron

directory on the CF card of the

CT Analyzer

has a formatting error in one of the parameters. Delete this file and check the settings in the menu

Main Menu -> Settings -> Misc. Settings

. If necessary, change the settings and store the file again.

832.xxx

Lifetime of relays near end. Contact the next OMICRON service center soon to arrange a hardware service.

Reason: The relays inside the

CT Analyzer

near the end of their lifetime (more than

1,000,000 measurements performed).

Solution: Arrange a hardware service in order to replace the relays.

833.xxx

You are about to load a report with an invalid hash code. Some measurement values may not be authentic.

Reason: The file checksum is not valid.

Solution: Check the authenticity of the report file loaded.

834.xxx

No valid license was found in this file!

Reason: No valid license found.

Solution: Check the license file. The license possibly does not correspond to the serial number of the

CT Analyzer

.

835.xxx

Downgrade a firmware below version 3.53 is not supported.

Reason:

Solution:

Attempt for a downgrade to a version number < 3.53.

Make sure that die FW version number for the upgrade/downgrade is not below

3.53.

900.xxx

Error [900.xxx] Power supply error. Switch off the device and wait 1 minute to restart.

Reason: The output power was larger than 350VA or the power supply is defective.

Solution: Switch the

CT Analyzer

off, wait 1 minute and then switch it on again. If this error occurs more frequently, you should contact your next OMICRON service center.


901.xxx

Warning [901.xxx] Protective earth (PE) connection in power supply cord missing.

Connect PE to equipotential terminal. Lethal voltage may occur on housing and all terminals.

Reason: Earth wire break, no earth wire connected or device is supplied via an isolation transformer.

Solution: The mains supply does not have reference to protective earth or protective earth is not connected. The mains supply must have galvanic connection to PE.

If you are using an isolation transformer, connect one supply line of the

CT Analyzer

to PE.

Warning:

Lethal voltages may occur at the housing if the grounding terminal of the device is not connected to protective earth potential!

Caution:

If the mains supply is galvanically isolated from earth potential, the device may become damaged.

Comment: If a galvanically isolated mains supply is used, voltage stress may occur for the insulation system, the device is not constructed for.

Safety is no longer guranteed!

Therefore, always use a mains power cord with a protective earthing conductor connected to PE of the mains supply. Connect the grounding terminal of the device to protective earth in order to prevent electric shock caused by lethal voltages possibly present at the housing. If this error is ignored, the device will probably work but safety is no longer guaranteed.

903.xxx

Warning [903.xxx] Excessive reverse power, don't disconnect any wires, don't switch off mains, wait until power is dissipated.

ATTENTION: Lethal voltages on output terminals!

Reason: The device receives excessive reverse power so that the power output had to

Solution: be shortened to prevent overload of the internal output stage.

This error is displayed if an excess amount of energy is fed back into the

CT Analyzer

. The

CT Analyzer

discharges the connected inductor with approximately 20Ws, but depending on the connected inductance the discharge process may take some time.

Safety action: All measurements are stopped until reverse power is dissipated.

Warning:

Lethal voltages of up to many kV may occur. Do not disconnect any wires and do not switch off the

CT Analyzer

. Wait until the power is dissipated.

904.xxx

Error [904.xxx] Power supply error. Contact next Omicron service center.

Reason: Temperature limit of secondary power supply exceeded.

Solution: It is not possible to acknowledge this error until the temperature is back in safe limits. If this error occurs, please contact your next OMICRON service center.

Safety action: All measurements are stopped.

181

182


905.xxx

Error [905.xxx] Over-temperature of power supply, wait until device has cooled down.

Reason: Secondary side power supply has reached the warning temperature limit and

Solution: entered save mode to cool down.

When this error is acknowledged as long it is active, the popup window is closed and only the message in the status line remains active until the overtemperature disappears. If the error is not acknowledged, the popup window remains active.

Comment: The status line displays the flashing message "905.xxx Overtemp.".

Safety action: All measurements are stopped and the error message is displayed in the status line and a popup window. After acknowledgement, the software waits at least

1 minute before the test can be started again.

906.xxx

Error [906.xxx] Excess temperature of power supply, wait until device has cooled down.

Reason: The primary side power supply has reached its warning temperature limit and entered save mode to cool down.

Solution: When this error is acknowledged as long it is active, the popup window is closed and only the message in the status line remains active until the overtemperature disappears. If the error is not acknowledged, the popup window remains active.


Safety action: All measurements are stopped and the error message is displayed in the status line and a popup window. After acknowledgement, the software waits at least

1 minute before the test can be started again.

908.xxx

Error [908.xxx] Device shut down.

Reason: Internal power failure on the measurement interface module.

Solution: The message is active as long as the internal power for the measurement interface fails. Contact the next OMICRON service center if the error does not disappear.

911.xxx

Error [911.xxx] Power supply error, contact next Omicron service center. Desired voltage xxxx, measured voltage yyyy.

Reason: One supply voltage on the measurement interface boards is out of tolerance.

Solution:

Comment:


It is no longer possible to work with the device.

912.xxx

Error [912.xxx] Excess internal temperature, wait until device has cooled down.

Reason: Device-internal temperature at measurement interface > 75°C.

Solution: Excessive heating of the device. Prevent the device from direct sunlight and wait until it has cooled down. If the error occurs without previous exposure to direct sunlight, the error is probably caused by a hardware error. Please contact your next OMICRON service center.


Safety action: All measurements are stopped and the error is displayed in the status line and in a popup window. The error is active until the temperature falls below 60°C.

929.xxx

Error [929.xxx] Hardware failure, contact next Omicron service center.

Reason: The circuit for reverse power dissipation does not work properly.

Solution: Contact your next OMICRON service center.

Safety action: All measurements are stopped and the power supply is switched off.


930.xxx

Error [930.xxx] Measurement input Vsec defective, contact next Omicron service center.

Reason:

Solution:

Power supply for analog input "Sec" is defective.


931.xxx

Error [931.xxx] Measurement input Vprim defective, contact next Omicron service center.

Reason:

Solution:

Power supply for analog input "Prim" is defective.


932.xxx

Error [932.xxx] Data error.

Reason: The sequence of reading of the analog input channels is not correct.

Solution: If this error occurs more frequently, contact your next OMICRON service center.

933.xxx

Error [933.xxx] Hardware failure, contact next Omicron service center.

Reason:

Solution:

Temperature detection circuit on secondary side is defective.

Send the device to your next OMICRON service center.

Safety action: Power supply is switched off and all measurements are disabled.

934.xxx

Warning [934.xxx] Reverse power, don't disconnect any wires, don't switch off mains, wait until power is dissipated. I = xxxxA.

Reason:

Solution:

The device receives reverse power of > 20mA.

Wait until the power is dissipated within the device and the error message disappears.

Safety action: All measurements are stopped until reverse power is dissipated.

935.xxx

Error [935.xxx] No valid CT Analyzer software. Insert a CF-Card with valid Software and press "Update Firmw.".

Reason:

Solution:

Cannot find valid

CT Analyzer

software.


CTAnalyzer.bin

) in the directory

A:\Omicron

.

936.xxx

Warning [936.xxx] Corrupt Calibration Data for voltage inputs. Change to tools menu and try to reset factory calibration. Until update of calibration data the device will be not calibrated.

Reason:

Solution:

The calibration data checksum for the analog inputs is not correct.

Try to update the factory calibration using the tools menu. If this does not solve the problem, contact your next OMICRON service center.

937.xxx

Warning [937.xxx] Corrupt Calibration Data for power output. Change to tools menu and try to update factory calibration. Until update of calibration data the device will be not calibrated.

Reason: The calibration data checksum for the power output is not correct.

Solution: Try to update the factory calibration using the tools menu. If this does not solve the problem, contact your next OMICRON service center.

938.xxx

Warning [938.xxx] MIF data block 1 corrupt.

Reason: The checksum of the factory settings data is faulty.

Solution: Licensing or device settings data are possibly corrupt. Contact your next

OMICRON service center.

939.xxx

Warning [939.xxx] MIF data block 2 corrupt.

Reason: The checksum of the factory settings data is faulty.

Solution: Licensing or device settings data are possibly corrupt. Contact your next

OMICRON service center.

183

184


940.xxx

Warning [940.xxx] CMOS data block corrupt. Check all device settings. Press Clear

Values to work with default values. Press OK to work with corrupt device settings.

Reason:

Solution:

Device settings data block corrupt.

Check all device settings.

941.xxx

Error [941.xxx] Corrupt factory calibration data for voltage inputs. Contact next

Omicron service center.

Reason: Factory calibration data block for voltage inputs corrupt.

Solution: Contact your next OMICRON service center.

942.xxx

Error [942.xxx] Corrupt factory calibration data for power unit. Contact next Omicron service center.

Reason:

Solution:

Factory calibration data corrupt.


943.xxx

Error [943.xxx] Error overwriting calibration data.

Reason:

Solution:

Factory calibration data cannot be restored.


944.xxx

Warning [944.xxx] Corrupt user text! Change to tools menu and try to update text. Until update of user text, the device will use default text.

Reason:

Solution:

Checksum for user language support data invalid.

Copy a user text file (

CTUser_xxx.bin

) to the directory

A:\Omicron\

on the

Compact Flash card and try to update the user language support data using the

"Update Text" function in the tools menu.

OMICRON Service Centers


Americas

OMICRON electronics Corp. USA

3550 Willowbend Blvd.

Houston, TX 77054, USA

Phone: +1 713 830-4660

Fax:

1 800-OMICRON

+1 713 830-4661 [email protected]

www.omicronusa.com

Asia – Pacific

OMICRON electronics Asia Ltd.

Suite 2006, 20/F, Tower 2

The Gateway, Harbour City

Kowloon, Hong Kong S.A.R.

Phone: +852 3767 5500

Fax: +852 3767 5400 [email protected]

www.omicron.at

Europe, Middle East, Africa

OMICRON electronics GmbH

Oberes Ried 1

A-6833 Klaus, Austria

Phone: +43 5523 507-333

Fax: +43 5523 507-999 [email protected]

www.omicron.at

For addresses of OMICRON electronics offices with customer service centers, regional sales offices or offices for training, consulting and commissioning please visit our Web site.

185

186


Index

Index

4-wire connection vs. 2-wire connection 42

A

accessories 20

Advanced (Quick Test) 139

AL error graph 117

AL error graph (default selection) 67 ambient temperature (default setting) 67

Assessment card 79, 125

assessed parameters 126

automatic CT test 131

B

Burden card 79, 100

burden test, wiring 26

bushing-type CT measurement 32

C

calibration 169 care and cleaning 169

Check "*" settings before start 71

class (default selection) 66

Class multiplication factor 72

climate conditions 167

Comment card 79, 130

Compact Flash memory card 13

technical data 166 computer interface 166

computer requirements for CT Analyzer PC Toolset

161

connecting the CT Analyzer to a PC 23

connection 21

4-wire connection technique 42

burden test 26

bushing-type CT 32

CT test 24

delta winding transformer 34

for special applications 28

for usual applications 24

GIS (SF6) switch gear 30

measurement for unwound iron core 29

noise reduction for measurement 43

polarity check (Quick Test) 39

primary winding resistance measurement 27

VT ratio measurement (Quick Test) 38

VT winding resistance measurement (Quick Test)

39

wye winding transformer 33

contact information 185

Continuous burden measurement 71

copying a file 64

CPOL polarity checker 145

creating a folder 63

CT Analyzer help system 76

CT Analyzer PC Toolset 161

start page 162

CT Ratio (Quick Test) 149

CT test execution

detailed 49

short guide 45

CT test, wiring 24

CTA Start Page 162

CTAnalyzer.xml 64

CT-Object card 79, 80

cutting a file 64

D

date/time (setting) 67

Decision 1A/5A CT 72

Decision P/M CT 72

default settings 65

deleting a file or folder 62

delivery, scope 20


dependency of test cards 70

dimensions 168

disconnection 41

display contrast (setting) 67

display overview 17

displaying a specific card 59

187

188


E

editing a card 60

electromagnetic compatibility (EMC) 168

electronic burdens (enable/disable) 67

environmental conditions 167

error and warning messages 171

Excitation card 54, 79, 108

AL error graph 117

excitation graph 114

excitation characteristic

determination 54

excitation graph 114

F

File Handling (main menu) 62

file system

copying a file 64

creating a folder 63

cutting a file 64

deleting a file or folder 62 loading a file 62

navigating in 63

pasting a file 64

renaming a file 62

saving a file 64

firmware update 73

firmware version 75, 76

frequency (default nom. freq. selection) 66

functional components 12

functional scope, license-depending 19

fuse 13

fuse replacement 169

G

gapped core, measurement 28

GIS (SF6) switch gear measurement 30

grounding terminal 13

Guesser function 131

H

hardware

Compact Flash memory card slot 13

display 17

fuse 13 grounding 13

I/0 key 16

inputs and outputs 15

keyboard 18

mains connection unit 13 on/off switch 13

overview 12

soft keys 17

status LEDs 16

version 76 help system 76

hotline 185

I

I/0 key 16

icons displayed in status line 17

IEC 60044-1


excitation test results 110, 111

specific parameters in CT-Object card 87, 88

IEC 60044-6


excitation test results 111

specific parameters in CT-Object card 89

IEC 61869-2




IEEE C57.13




Impedance (Quick Test) 156

inputs

overview 15

technical data 163

installation


Index

K

keyboard 18

Ktd calculation method (default selection) 66

L

language selection 65

language update 73

licenses 19, 20

licenses update 74

loading a file 62

M

Main Menu 60

File Handling 62

New CT test 61

New MR test 61

New Quick test 61

Settings 65

Tools Menu 73

mains fuse 13

mains power supply, technical data 163

mains socket 13

maintenance 169

measurement inputs

overview 163 technical data 163

Min. VA at M cores Isn 5A 67

minimum computer requirements for CT Analyzer PC

Toolset 161

misc. settings (default settings) 68, 70

N

navigating in file system 63

New CT test (main menu) 61

New MR test (main menu) 61

New Quick test (main menu) 61


O

on/off switch 13

operation from computer 77

operator qualifications 7

output

overview 15

technical data 163

overload indication 100

overview, hardware overview 12

P

P/M (default selection) 66

pasting a file 64

PC connection 23

PC Toolset 161

phase accuracy 164

phase table for IEC 60044-1, IEC 60044-6 &

IEC 61869-2 122

phase table for IEEE C57.13 123


polarity check (Quick Test), wiring 39

power supply 22, 163

primary winding resistance measurement 105, 106

wiring 27

Q

Quick Test

Advanced meas. type 139

CT Ratio meas. type 149

Impedance meas. type 156

introduction 137

performing measurements 139

polarity check 145

Reactance meas. type 158

Resistance meas. type 154

safety notes 136

VT Ratio meas. type 151

R

ratio accuracy 164

Ratio card 54, 79, 119

accuracy of phase table values 164 accuracy of ratio table values 164

phase table for IEC 60044-1, IEC 60044-6 &

IEC 61869-2 122

189


190

phase table for IEEE C57.13 123

ratio table for IEC 60044-1, IEC 60044-6 &

IEC 61869-2 122

ratio table for IEEE C57.13 123

ratio measurement 54

ratio table

accuracy of values 164

ratio table for IEC 60044-1, IEC 60044-6 &

IEC 61869-2 122

ratio table for IEEE C57.13 123

Reactance (Quick Test) 158

reference graph 115

remote control interface 166

remote operation from PC 77

renaming a file 62

replacing the fuse 169

Residual Magnetism card 79, 102

running a residual magnetism measurement 103

Resistance (Quick Test) 154

Resistance card 54, 79, 105

accuracy of winding resistance values 164

running a CT test

detailed 49

short guide 45

S

safety rules

for connecting and operating the CT Analyzer 21

general rules for safe operation 9

Quick Test 136

safety standards 7, 168

saving a file 64

scope of delivery 20

secondary winding resistance measurement 105, 106

Settings (main menu) 65

setup 21

connecting the CT Analyzer to a PC 23

setting up the CT Analyzer 22

shock and vibration conditions 167

short guide 45

soft keys 17

using the soft keys 59

standard (default selection) 66

start delay (default selection) 67

start page


startup mode (default selection) 65

status LEDs 16

support 185

symbols displayed in status line 17

system requirements for CT Analyzer PC Toolset 161

T

technical data

Compact Flash memory card 166

electromagnetic compatibility 168


inputs 163 mains power supply 163 output 163

phase accuracy 164 ratio accuracy 164

remote control interface 166

safety standards 168 weight and dimensions 168

winding resistance accuracy 164

technical support 185

temperature unit (default selection) 67

test cards

dependencies 69

displaying a specific card 59

editing a card 60

overview of test cards 79

test cards (default selection) 65, 69

test cards selection 81

test execution

detailed 49

short guide 45

test finshed message screen 54

test settings 80

time/date (setting) 67

Tools Menu (main menu) 73 update firmware 73

update licenses 74

update text 73

U

unwound iron core measurement, wiring 29

update firmware 73

update licenses 74

update user interface language 73

user interface language

selection 65

update 73

user maintenance 169

V

version

CT Analyzer software 76 hardware 76 language 76

VT Ratio (Quick Test) 151

VT ratio measurement (Quick Test), wiring 38

VT winding resistance measurement (Quick Test), wiring 39

W

warning messages 171

weight 168

winding resistance accuracy 164

wiring

4-wire connection technique 42

burden test 26

bushing-type CT 32

CT test 24


GIS (SF6) switch gear 30

measurement for unwound iron core 29




VT ratio measurement (Quick Test) 38

VT winding resistance measurement (Quick Test)

39

wye winding transformer 33

wiring for Quick Test

Advanced 144

CT Ratio 150

Impedance 157

Polarity Check 147

Reactance 159

Resistance 155

VT Ratio 152

wye winding transformer measurement 33

Y

Y winding transformer measurement 33

Index

191

192


CT SB2

User Manual

CT SB2 User Manual

2

Manual Version: CTSB2.AE.3

Contents

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operator Qualifications and Safety Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Conventions and Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Orderly Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Safe Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1 Introduction and Designated Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2 Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

2.1

Functional Components of the CT SB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2

Block Diagram (Simplified). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.3

CT SB2 Accessories (Scope of Delivery) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3 Measurement Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

3.1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.2

Connecting the Communication Link Between CT SB2 and CT Analyzer. . . . . 20

3.3

Basic Measurement Setup for Multi-Ratio CT Testing. . . . . . . . . . . . . . . . . . . . 21

3.4

Basic Measurement Setup for Single-Ratio CT Testing . . . . . . . . . . . . . . . . . . 22

3.5

Additional Wiring for Burden Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.6

Additional Wiring for Primary Winding Resistance Measurement . . . . . . . . . . . 24

4 Short Guide for Multi-Ratio CT Testing Using the CT SB2 . . . . . . . . . . . .25

4.1

Preparing the Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.2

Configuring and Starting the Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.3

Automatic Test Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.4

After the Test is Finished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5 Default Settings on the CT Analyzer for Multi-Ratio CT Testing . . . . . . . .33

3

4


6 CT Analyzer Test Cards for Multi-Ratio CT Testing . . . . . . . . . . . . . . . . . . 35

6.1

CT-Object Card for Multi-Ratio CT Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.2

MR-Config. Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6.2.1 Available Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.2.2 Parameters and Settings Used or Determined During the Test . . . . . . . . . . . . . 40

6.3

MR-Results Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.3.1 Available Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.3.2 Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6.4

Resistance, Excitation and Ratio Card for Multi-Ratio CT Testing . . . . . . . . . . 47

6.5

Test Assessment for Multi-Ratio CT Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

7 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

7.1

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

7.2

PC and CTA Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

7.3

Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

7.3.1 Climate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

7.3.2 Shock and Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

7.3.3 Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

7.3.4 Safety Standards, Electromagnetic Compatibility (EMC) . . . . . . . . . . . . . . . . . . 52

8 User Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

8.1

Care and Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

8.2

Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

9 Error and Warning Messages for the CT SB2 . . . . . . . . . . . . . . . . . . . . . . . 55

OMICRON Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Preface

Preface

Using This Manual

This CT SB2 User Manual provides information on how to use the

CT SB2

switch box. The CT SB2 User Manual contains important safety instructions for working with the

CT SB2

, gets you familiar with operating it, and provides typical

application examples. Read and observe the safety rules described in "Safety

Rules" on page 7 and all relevant instructions for installation and operation.

Following the instructions in this User Manual will help you to prevent danger, repair costs, and avoid possible down time due to incorrect operation.

The CT SB2 User Manual always has to be available at the site where the

CT SB2

is used. It must be read and observed by all users of the

CT SB2

.

Reading the CT SB2 User Manual alone does not release you from the duty to comply with all relevant national and international safety regulations.

Operator Qualifications and Safety Standards

Working on high-voltage power equipment can be extremely dangerous.

Testing with the

CT Analyzer

and the

CT SB2

switch box should only be carried out by authorized and qualified personnel. Before starting to work, clearly establish the responsibilities.

Personnel receiving training, instruction, direction, or education on the

CT Analyzer

and the

CT SB2

should remain under the constant supervision of an experienced operator while working with the equipment.

The operator is responsible for the observance of all applicable safety requirements during the entire test. When performing tests in high-voltage areas, pay attention to the national and international standards for safe operation of high-voltage test equipment (EN 50191, IEEE 510, and others).

Moreover, observe all applicable regulations for accident prevention in the country and at the site of operation.

5

6


Conventions and Symbols Used

In this manual, the following symbols indicate paragraphs with special safetyrelevant meaning:

Symbol Description

Caution:

Equipment damage or loss of data possible.

Warning:

Personal injury or severe damage to objects possible.

Related Documents

The following documents complete the information covered in the CT SB2 User

Manual:

Title

CT Analyzer User Manual

Help System for


Description

Contains information how to use and operate the

CT Analyzer

as well as safety instructions for working with the

CT Analyzer

.

Contains detailed information about the software tools provided with the


.

Safety Rules

Safety Rules

Before operating the

CT SB2

switch box, read the instructions in this section carefully. If you do not understand some safety rules, contact OMICRON electronics GmbH before proceeding. The

CT SB2

is designated for use with the

CT Analyzer

. Therefore, observe the safety rules both in this User Manual and in the CT Analyzer User Manual when working with the

CT SB2

switch box.

Maintenance and repair is only permitted by qualified experts either at the factory or certified external repair centers.

General

Always observe the five safety rules:

• Disconnect completely

• Secure from reconnection

• Verify that the installation is dead

• Carry out grounding and short-circuiting

• Provide protection against adjacent live parts

Orderly Measures

The CT SB2 User Manual or the e-book version of the manual always has to be available on the site where the

CT SB2

is being used. All users of the

CT SB2

must read and observe the safety rules and all relevant instructions for installation and operation.

The

CT SB2

may be used only as described in this User Manual. Any other use is not in accordance with the regulations. The manufacturer and the distributor are not liable for damage resulting from improper usage. The user alone assumes all responsibility and risk.

Full compliance with the regulations also includes following the instructions provided in this User Manual.

Power Supply

Supply the

CT SB2

only from a power outlet that is equipped with protective ground (PE). Instead of supplying the

CT SB2

from phase-neutral, it may also be supplied from phase-phase. However, the voltage must not exceed

240V AC.

7

8


Safe Operation

• Make sure to position the test equipment on dry, solid ground.

• If working in other than laboratory environment only use the

CT SB2

with a solid connection to ground of at least 6mm

2

. Use a ground point as close as possible to the test object.

• Do not open the

CT SB2

. Opening the

CT SB2

invalidates all warranty claims.

• Do not repair, modify, extend, or adapt the

CT SB2

or any accessories.


CT SB2

under wet or moist conditions (condensation).


CT SB2

when explosive gas or vapors are present.

• Use only original accessories available from OMICRON electronics GmbH.

• Before putting the

CT SB2

into operation, check it for visible damages.

• Use the

CT SB2

only in a technically sound condition and when its use is in accordance with the safety regulations for the specific job site and application.

• Always be aware of the danger of the high voltages and currents associated with this equipment. Pay attention to the information provided in this User

Manual.

• When disconnecting cables, always start at the device feeding the power.

• Never connect or disconnect a test object while the outputs of the connected

CT Analyzer

are active.

• If the

CT SB2

seems to be functioning improperly, please call the OMICRON

electronics GmbH hotline (refer to chapter "OMICRON Service Centers" on page 57).

• For protection against parasitic currents or voltages, always connect the equipotential connector on the

CT SB2

to protective ground (PE). Only use the original cable set supplied by OMICRON electronics GmbH.

• Make sure that the terminals of the test object to be connected to the

CT SB2

do not carry any voltage potential. During a test, the

CT Analyzer

(with the

CT SB2

connected) is the only permitted power source for the test object.

• Only use wires with 4mm safety "banana" connectors and plastic housing for connection to the front panel input/output sockets.

Safety Rules

Disclaimer

The

CT SB2

is intended exclusively for the applications described in chapter

1 on page 11. Any other use is deemed not to be according to the regulations.

If the

CT SB2

is used in a manner not specified by the manufacturer, the protection provided by the

CT SB2

may be impaired.

The manufacturer and the distributor are not liable for damage resulting from improper usage. The user alone assumes all responsibility and risk.

9

10


1

Introduction and Designated Use

Introduction and Designated Use

The

CT SB2

switch box is an accessory for the

CT Analyzer

and therefore exclusively designated for use with the

CT Analyzer

.

The

CT SB2

is intended for the following applications:

• Multi-ratio CT testing

The

CT SB2

switch box enables automatic testing of multi-ratio CTs with up to 6 tap connections. With this accessory, the

CT Analyzer

is able to measure every tap combination of multi-ratio CTs without any need for wiring changes during the test.

• Burden and primary winding resistance measurement

Using the

CT SB2

it is also possible to include burden and primary winding resistance measurement to the automatic CT test procedure without rewiring.

• Single-ratio CT testing

Due to the possibility to include burden and primary winding resistance measurement, the

CT SB2

is not only useful for testing multi-ratio CTs but also for testing single-ratio CTs.

The

CT SB2

is intended exclusively for the applications described above. Any other use is deemed not to be according to the regulations. The manufacturer and the distributor are not liable for damage resulting from improper usage. The user alone assumes all responsibility and risk.

Warning:

The

Quick Test

function of the

CT Analyzer

and the

CTA Quick Test

PC tool cannot be used with the

CT SB2

switch box.

11

12


Hardware

2

2.1

Hardware

Functional Components of the CT SB2

PC and CTA interfaces

BURDEN

IN: Measurement input for burden measurement.

OUT: Generator output for burden measurement.

A green LED lights up when the output is active.

TAPS

Terminals for connection of CT taps

X1 to X6.

Connect each CT tap to both sockets!

A green LED lights up to indicate which input/output is currently active.

See also

Figure 2-2

Equipotential bonding connector

PRIM

IN: Measurement input for primary side of the CT.

OUT: Generator output for primary winding resistance measurement.

A green LED lights up when the output is active.

Mains connection unit

Mains socket with fuse and ON/OFF switch

CT ANALYZER

Input and output terminals for connection to the

CT Analyzer

measurement inputs and generator output.

LEDs

I/0 Green power LED. Indicates that the

CT SB2

is switched on and ready for operation.

Status LED.

Figure 2-1

CT SB2

overview

13

14


PC

interface

9-pole SUB-D connector, female.

Connection of the

CT SB2

to a PC

(to serial COM interface or USB interface via USB-serial adapter).

Mains fuse: 2 x T2.0A / 250V, high breaking capacity

ON/OFF switch Mains socket (IEC320)

CTA

interface

9-pole SUB-D connector, male.

Connection of the

CT SB2

to the remote control interface of the

CT Analyzer

.

Figure 2-2

Equipotential bonding connector

(4mm socket combined with knurled nut for clamp connection)

Side view to the

CT SB2

with mains connection unit, PC and

CTA interfaces, and equipotential bonding connector

Hardware

2.2

Block Diagram (Simplified)

PRIM

Relays

Control

BURDEN

BURDEN

Relays

Mains

Power Supply

Figure 2-3 Simplified block diagram of the

CT SB2

TAPS

Switching relays

CTA

RS232

CTA

RS232

PC

15

16


2.3

CT SB2 Accessories (Scope of Delivery)

The following accessories are delivered with the

CT SB2

switch box:

Accessories

1 x 6-pole cable

Description

Cable for connecting the

CT SB2

to the

CT Analyzer

1 x 12-pole cable,

7m (22ft)

1 x 4-pole cable,

7m (22ft)

Test cable for connecting the secondary side of the CT to the

CT SB2

Test cable for connecting the burden to the

CT SB2

1 x 9-pole SUB-D cable, 0.3m (1ft)

12 x clamp

1 x Power cord adapter

Data connection cable from the CTA interface on the

CT SB2

to the remote control interface on the

CT Analyzer

Clamps in 6 different colors according to the

12-pole test cable for connecting the test cable plugs to the tap connections on the secondary side of the CT

Using this adapter, only one power supply cord is required to supply the

CT Analyzer

and the

CT SB2

Accessories

1 x Cable bag

Hardware

Description

Bag for cables and accessories

17

18


Measurement Setup

3

3.1


General

When connecting the CT to the

CT SB2

, please also observe the wiring hints given in the CT Analyzer User Manual.

Always connect only one CT to the

CT SB2

. Disconnect and remove unused cabling from the

CT SB2

and the CT after testing.

Using the

CT SB2

switch box, CT testing, burden measurement and primary winding resistance measurement can be performed separately (i.e., using

separate test procedures) or together in one test sequence. Figure 3-2 and

Figure 3-3 show the basic wiring required for CT testing. To measure the burden

and the primary winding resistance together with the CT test, the additional

wiring shown in Figure 3-4 and Figure 3-5 is necessary.

The advantage of using the

CT SB2

for single-ratio CT testing is the option to include burden and/or primary winding resistance measurement to the test without any need for wiring changes during the test procedure. If you do not want to perform burden or primary winding resistance measurement, you should preferably use the normal single-ratio CT test mode of the

CT Analyzer

without using the

CT SB2

.

If you do not use the

CT SB2

switch box for CT testing with the

CT Analyzer

, disconnect all cabling to the

CT SB2

from the

CT Analyzer

(incl. the data connection cable connected to the remote control interface of the

CT Analyzer

).

Warning:

When measuring the ratio of transformers make sure that the test voltage is connected to the corresponding secondary winding, and the primary winding is connected to the according measurement input. Accidentally mixing up the windings can cause life-threatening voltages within the transformer and/or destroy the connected CT, the

CT SB2

or the

CT Analyzer

!

Warning:

Feeding test voltage to a tap of a multi-ratio CT can cause lifethreatening voltages on other taps with higher ratios. Always connect all secondary taps to the

CT SB2

switch box in order to guarantee safety during testing.

19

20


3.2

Connecting the Communication Link Between

CT SB2 and CT Analyzer

CT Analyzer



CT Analyzer

to a PC.

The setup for connecting the

CT SB2

switch box depends on two factors:

• Should the

CT Analyzer

be connected to a PC?

• Which

CT Analyzer

interface should be used for PC connection?

Connect the

CT Analyzer

and the

CT SB2

switch box accordingly as shown in the following figure.

CT Analyzer

not connected to a PC:

CTA

RS232

(crossover)

CT SB2 CT Analyzer

CT Analyzer

connected to PC via USB:

CTA

RS232

(crossover)

CT SB2 CT Analyzer

USB A/B

to PC

CT Analyzer

connected to PC via RS232 interface:

CT Analyzer

Figure 3-1

CTA PC

RS232/USB adapter

to PC

RS232

(crossover)

CT SB2

RS232

(1:1)

or

PC

RS232

(1:1)

Connection diagrams for communication link

CT SB2

-

CT Analyzer

- PC

to PC


3.3

Basic Measurement Setup for Multi-Ratio CT Testing

CT

X6

X5

X4

X3

X2

X1

Burden

Wiring for burden measurement see

Figure 3-4

*

*

*

For information how to connect the communication link between the

CT SB2

and the

CT Analyzer

, please refer to section 3.2 on page 20.

Figure 3-2 Basic measurement setup for multi-ratio CT testing (6 tap CT, no burden measurement, no primary winding resistance measurement)

Warning:

Feeding test voltage to a tap of a multi-ratio CT can cause lifethreatening voltages on other taps with higher ratios. Always connect all secondary taps to the

CT SB2

switch box in order to guarantee safety during testing.

21

22


3.4

Basic Measurement Setup for Single-Ratio CT

Testing

Note:

If you do not want to perform burden or primary winding resistance measurement, you should preferably use the normal single-ratio CT test mode of the

CT Analyzer

without using the

CT SB2

. Remove the data connection cable from the remote control interface of the

CT Analyzer

if you do not use the

CT SB2

for CT testing with the

CT Analyzer

.

CT

Burden

Wiring for burden measurement see

Figure 3-4

*

*

*


CT SB2

and the

CT Analyzer


Figure 3-3 Basic measurement setup for single-ratio CT testing (no burden measurement, no primary winding resistance measurement)


3.5

Additional Wiring for Burden Measurement

Burden measurement may be performed separately or in conjunction with CT testing and/or primary winding resistance measurement.

The following wiring is required for burden measurement (in addition to the basic

measurement setup shown in Figure 3-2 and Figure 3-3 and/or the additional

wiring for primary winding resistance measurement shown in Figure 3-5, as

required).

CT

X6

X5

X4

X3

X2

X1

Burden

Basic CT wiring,

see Figure 3-2 or Figure 3-3

*

*

*


CT SB2

and the

CT Analyzer


Figure 3-4 Additional wiring required for burden measurement

23

24


3.6

Additional Wiring for Primary Winding Resistance

Measurement

Primary winding resistance measurement may be performed separately or in conjunction with CT testing and/or burden measurement.

The following wiring is required for primary winding resistance measurement (in

addition to the basic measurement setup shown in Figure 3-2 and Figure 3-3

and/or the additional wiring for burden measurement shown in Figure 3-4, as

required).

CT

X6

X5

X4

X3

X2

X1

Burden

Wiring for burden measurement,

see Figure 3-4

Basic CT wiring,

see Figure 3-2 or Figure 3-3

*

*

*


CT SB2

and the

CT Analyzer


Figure 3-5 Additional wiring required for primary winding resistance measurement

Short Guide for Multi-Ratio CT Testing Using the CT SB2

4 Short Guide for Multi-Ratio CT Testing

Using the CT SB2

4.1

Note:

For detailed instructions regarding the operation of the

CT Analyzer

, please refer to the CT Analyzer User Manual.

The test procedure described below shows an example for a multi-ratio CT test without using the guesser function of the

CT Analyzer

. For a more detailed description of the guesser function, please refer to the CT Analyzer User

Manual.

For reasons of simplicity, the test described below does not use the the burden measurement and the primary winding resistance measurement.

Preparing the Test

1. Connect the

CT SB2

, the

CT Analyzer

and the CT under test as described in


2. Switch the

CT SB2

and the

CT Analyzer

on.

3. On the

CT Analyzer

, select "New MR-Test" from the

main menu

and press the

OK

soft key to initialize a new multi-ratio CT test.

4.2

Configuring and Starting the Test

How to get there:

Press the

...

key in the

CT-Object

card

Press the

Select Cards

soft key

In the

Select Cards

page, use the

Add

or

Remove

soft key to select or deselect a test card

After initializing a new multi-ratio CT test, the default

CT-Object

card is displayed on the

CT Analyzer

.

1. Press the

Select Cards

soft key in the

CT-Object

card to open the

Select

Cards

page. Check, and if necessary make the following test card selection.

When finished, press the

Back

soft key to return to the

CT-Object

card.

Test cards required

(add if necessary)

CT-Object

Secondary Winding Resistance

Excitation

Ratio

Assessment

Test cards not required

(remove if necessary)

Burden

Residual Magnetism

Primary Winding Resistance

25

26


2. In the

CT-Object

card, specify the CT data according to the CT’s name plate.

Specify the data in the order of the following table.

For more detailed information, please refer to section 6.1 on page 36.

Figure 4-1

CT-Object

card with soft keys for predefined CT ratios if the number of taps is set to 5

Standard

P/M

I-pn

I-sn

Class

VA (or Vb) cos ϕ



Rated primary current

for the full tap combination

CT and rated secondary current of the CT.

of the

Note:

The CT data for the full tap combination can only be set in the

CT-Object

card.

If the selected standard is IEEE C57.13 and the "Number of

Taps" is set to 5 or 3 in the

MR-Config.

card, the

CT Analyzer

offers soft keys with predefined ratios when the

"I-pn" field is selected with the cursor (see Figure 4-1). If you

select one of these predefined multi-ratio schemes, the

CT Analyzer

automatically specifies the ratios for all tap combinations in the

MR-Config.

card.

Note:

The default number of taps can be set in the device settings of the

CT Analyzer

, see chapter 5 on page 33.

If the selected standard is not IEEE C57.13, enter the values for I pn

and I sn

manually.

Rated accuracy class of the CT. This field becomes available after selecting the CT type (protection or metering CT).

Nominal burden


of the CT.

For protection CTs of the IEEE C57.13 classes C, K and T, enter the rated secondary terminal voltage V b

instead of VA.

The

CT Analyzer

then automatically calculates the value for

VA.

The cos ϕ for the nominal burden is automatically selected according to the standard.


Burden cos ϕ

Operating burden and cos ϕ of the

tap in use

.

If the value of the connected operating burden is available, enter the values to these fields. If you measure the burden during the CT test using the burden measurement function of the

CT Analyzer

, these fields are filled automatically.

If you do not set any value in these fields, the

CT Analyzer

automatically uses the same values as for the nominal burden.

Note:

Depending on the selected standard and CT type, other or further CT data may be necessary for a correct assessment. If the "Check "*" settings before start" option is enabled in the default test settings of the

CT Analyzer

, all parameters that are required for assessment are marked by a star "*" in the

CT-Object

card. For more detailed information, please refer to the

CT Analyzer User Manual.

3. Display the

MR-Config.

card (see Figure 4-2) and configure the multi-ratio

CT test according to your CT under test.

For a detailed description of this card, please refer to section 6.2 on page 38.

MR-Config.

card for a new multi-ratio CT test after selecting a predefined multi-ratio scheme for I pn

in the

CT-Object

card.

MR-Config.

card for a new multi-ratio CT test after specifying the values for I pn manually in the

CT-Object

card.

and I sn

Figure 4-2

MR-Config.

card for a new multi-ratio CT test

Number of

Taps

Select the overall number of tap connections available on the multi-ratio CT using the soft keys.

If the number of taps selected is 5 or 3, the

CT Analyzer

offers soft keys with predefined CT ratios when the "I-pn" field is selected in the

CT-Object

card.

Note:

The default number of taps can be set in the device settings of the

CT Analyzer


27

28


Tap in Use Select the tap combination actually used during operation of the CT (e.g. X1-X5) using the soft keys. By default, the "Tap in Use" field is set to the full tap combination.

Taps

For the tap combination selected here, the

CT Analyzer

displays the detailed test results in the

Resistance

,

Excitation

and

Ratio

cards. The automatic test assessment in the

Assessment

card is however always done for the full tap combination given by the

Number of Taps

(e.g. for X1-X5 if number of taps = 5).

This column lists all possible tap combinations of the CT

(e.g. X1-X5, X1-X4, X1-X3, ...). The number of available tap combinations depends on the number of taps specified in the "Number of Taps" field.

Note:

When the

MR-Config.

card’s tab is highlighted you can select whether X1 or the highest available tap is used as the common tap. The default common tap can be selected in the device settings of the

CT Analyzer


Using the

Show Inter Taps

soft key you can display the intertap combinations instead of the tap combinations. If the intertap combinations are displayed, the soft key changes to

Show Taps

.

Ipn : Isn (A) Enter the nominal ratio for each single tap combination.

If you selected a predefined multi-ratio scheme for

IEEE C57.13 in the

CT-Object

card, this column is automatically filled with predefined ratios for all tap combinations.

If you entered I pn

and I sn

manually in the

CT-Object

card, you have to specify the I pn

for each tap combination in this column. I sn

is always taken from the

CT-Object

card.

Note:

The

CT Analyzer

automatically performs a plausibility check for the ratios entered by the user. For example, an error message is displayed if the I higher than the I pn

entered for X1-X3 is pn

specified for X1-X4.

Note:

The data for the full tap combination can only be set in the

CT-Object

card.


I/0

VA cos or ϕ

Burden cos

Test ϕ

Nominal burden for each tap combination.

To obtain correct measurement results, the nominal burdens for the inner tap combinations (e.g. X1-X2 etc.) should be smaller than the nominal burden for the full tap combination according to the winding ratios of the tap combinations (e.g. 25 VA for X1-X5, 12.5 VA for X1-X4 etc.). The

CT Analyzer

supports this with an automatic function.

As soon as the primary current I pn

is specified for a tap combination, the

CT Analyzer

automatically calculates and sets the corresponding nominal burden and cos ϕ for this tap combination. The nominal burden (VA) automatically assigned by the

CT Analyzer

can be changed manually by the user for all tap and intertap combinations except the full tap combination.

Note:

The "VA" column is displayed by default when opening the

MR-Config.

card the first time after initializing a new multi-ratio test. Using the

Op. Burden

soft key you can display the "Burden" column instead.

Operating burden and cos ϕ

for each tap combination.

This column displays for each tap combination the operating burden and cos ϕ

specified in the

CT-Object

card. The values cannot be changed by the user.

Note:

The "Burden" column is displayed if you selected to display the operating burden using the

Op. Burden

soft key.

In this column, select the tap combinations you actually want to measure during the CT test. You can enable or disable each single tap combination individually (disabling the full tap combination is not possible). Disabling unused tap combinations reduces the test duration.

4. Start the multi-ratio CT test by pressing the

I/0

key on the

CT Analyzer

.

The red LED on the

CT Analyzer

flashes to indicate that the CT test is running.

29

30


4.3

4.4

Automatic Test Execution

I/0

After starting the multi-ratio CT test, the

CT Analyzer

first checks the communication with the

CT SB2

via the serial interface. The

CT Analyzer

then checks the input/output wiring between the

CT Analyzer

and the

CT SB2

and, prior to each measurement, the corresponding wiring from the

CT SB2

to the test object required for this particular measurement. If the

CT Analyzer

detects any missing or faulty connections, a corresponding error message is displayed.

The currently active input/output of the

CT SB2

switch box is indicated by a green LED on the

CT SB2

front panel.

1. The

CT Analyzer

measures the secondary winding resistance of the CT for each tap combination.

2. The

CT Analyzer

measures the excitation curve and determines the knee point and other important CT data for each tap combination.

3. The

CT Analyzer

measures the actual current ratio, the winding ratio, the ratio error and the phase error for each tap combination.

4. When the test is over, the red LED stops flashing and the green LED is on.

The

CT Analyzer

displays a "Test finished" message showing the status of the test execution and the overall test assessment. Press any key on the keyboard to close this message.



CT-Object

card is displayed, showing the CT data

(see Figure 4-3).

Figure 4-3

CT-Object



The

MR-Config.

card displays the test configuration defined prior to the test.

Figure 4-4

MR-Config.

card

The

MR-Results

card displays detailed data for the individual tap combinations of the multi-ratio CT. You can switch this card to display the ratio results (e.g. winding ratio, ratio and phase error, etc.) or the excitation results (e.g. V kn etc.).

, I kn

,

For a detailed description of this card, please refer to section 6.3 on page 44.

The

CT Analyzer

calculates the results for the operating burden (parameter

"Burden" in the

CT-Object

card) and for the nominal burden (parameter "VA" in the

CT-Object

card). Depending on the burden selected, the

MR-Results

card shows the results calculated with the nominal burden or calculated with the operating burden.

Figure 4-5

MR-Results

card showing ratio results (left) and excitation results (right)

Hint:

It is possible to simulate the performance of the CT for other burden values than the nominal burden by changing the "Burden" value in the

CT-Object

card.

The

CT Analyzer

then automatically performs a recalculation of the results displayed in the

MR-Results

card for the new operating burden.

In the

CT-Object

card, enter the "Location" and "Object" details and save the test (use the cursor keys to scroll within the card and select the edit fields).

The assessment of the measurement results


can be viewed on the

Assessment

card.

If desired, you can view the measurement results

for the tap in use

selected in the

MR-Config.

card by viewing the

Resistance

card, the

Excitation

card and the

Ratio

card.

31

32


Default Settings on the CT Analyzer for Multi-Ratio CT Testing

5 Default Settings on the CT Analyzer for

Multi-Ratio CT Testing

How to get there:

Press the

Main

soft key in any test card on the

CT Analyzer

Main Menu:

- Settings

Select

soft key

Setting Menu:

- Select Startup Mode

Select

soft key

->

Set Startup Mode

page

The

CT Analyzer

allows customization of the default settings for multi-ratio CT testing using the

CT SB2

. These settings are defined using the

Select Startup Mode

option in the

Setting Menu

of the

CT Analyzer

.

Open the


page and press the

Multi-Ratio

soft key. The


page then looks as shown in Figure 5-1.

Figure 5-1


page with

Multi-Ratio

startup mode selected

Modify the default settings according to your needs and press the

Back

soft key to apply your default settings.

Mode at Startup

Number of Taps

According to the mode selected, the

CT Analyzer

automatically initializes a single tap CT test, a multi-ratio

CT test or a QuickTest measurement after startup.

Select the mode using the soft keys

Single Tap

,

Multi-Ratio

or

Quick

.

If the

Multi-Ratio

mode is selected, the CT test initialized after switching on the

CT Analyzer

contains the additional test cards

MR-Config.

and

MR-Results

for multi-ratio CT testing.

The number of taps is the overall number of tap connections available on the multi-ratio CT.

Select the default number of taps using the soft keys

No. of Taps 2

to

No. of Taps 6

.

The default number of taps defined here is used each time a new multi-ratio CT test is initialized by selecting

"New MR-Test" from the main menu of the

CT Analyzer

.

33

34


Common Tap The common tap is the tap that is used as reference for all tap combinations (e.g. X1-X2, X1-X3, X1-X4, etc. if common tap is X1).

Select the default common tap using the soft keys

X1

and

X#

, where # is the highest tap number available depending on the selected number of taps.

The common tap defined here is used each time a new multi-ratio test is initialized by selecting "New MR-Test" from the main menu of the

CT Analyzer

.

6

CT Analyzer Test Cards for Multi-Ratio CT Testing

CT Analyzer Test Cards for Multi-Ratio CT

Testing

For multi-ratio CT testing using the

CT SB2

switch box, the

CT Analyzer

provides two additional test cards:

MR-Config.

and

MR-Results

.

These cards are only available if a multi-ratio CT test has been initialized by selecting "New MR-Test" from the main menu of the

CT Analyzer

.

Depending on the selected standard, the behavior of the

CT-Object

card may differ slightly from the normal single-ratio CT test mode without using the

CT SB2

.

See section 6.1 on page 36.



35

36


6.1

CT-Object Card for Multi-Ratio CT Testing

Use the

CT-Object

card to specify the CT data according to the CT’s name plate. Specify the data in the order of the following table.

Fields underlined by dotted lines can be edited.

In multi-ratio test mode, the status line displays the full tap combination of the CT.

Figure 6-1

Standard

P/M

I-pn

I-sn

Class

CT-Object

card with name plate data entered



Rated primary current


of the

CT and rated secondary current of the CT.

These values specify the full tap ratio displayed in the

MR-Config.

card. The full tap ratio of the CT can only be specified and/or changed here.

For IEEE C57.13 only:

If the selected standard is IEEE C57.13 and the "Number of

Taps" is set to 3 or 5 in the

MR-Config.

card, the

CT Analyzer

offers soft keys with predefined ratios for 3-tap or 5-tap CTs when the "I-pn" field is selected with the cursor

(see Figure 6-2).

If you select one of these predefined multi-ratio schemes, the

CT Analyzer

automatically specifies the ratios for all tap combinations in the

MR-Config.

card. For example, selecting the

1200 : 5 A

soft key will result in nominal ratios of

1200 : 5, 800 : 5, 300 : 5 and 200 : 5 (see Figure 6-3 on page

38).

Note:

Selecting a predefined multi-ratio scheme overwrites possibly existing settings for I pn

and I sn

in the

CT-Object

card and the ratios in the

MR-Config.

card.

Rated accuracy class of the CT. This field becomes available after selecting the CT type (protection CT or metering CT).


VA (or Vb) cos ϕ

Burden cos ϕ

Nominal burden


of the CT.

For protection CTs of the IEEE C57.13 classes C, K and T, enter the rated secondary terminal voltage V b

instead of VA.

The

CT Analyzer

then automatically calculates the value for

VA.

The cos ϕ

for the nominal burden is automatically selected according to the standard.

Note:

The

CT Analyzer

automatically scales down the nominal burden specified here for the individual tap combinations available in the

MR-Config.

card according to

their ratios (see ”VA” on page 42).

Operating burden and cos ϕ of the

tap in use

.

Enter the burden manually or measure the burden using the

Burden

card.

Note:

The operating burden specified here is used for all tap combinations specified in the

MR-Config.

card. In contrast to the nominal burden (VA), the operating burden is not scaled

down according to the ratios (see ”Burden” on page 42).

You could use these fields for example to simulate the CT behavior at different load conditions after the test. Enter the value of your choice and view the measurement results of the multi-ratio CT test for the new operating burden in the

MR-Results

card (see section 6.3.2 on page 45).

Note:

Depending on the selected standard and CT type, other or further CT data may be necessary for a correct assessment. If the "Check "*" settings before start" option is enabled in the default test settings of the

CT Analyzer

, all parameters that are required for assessment are marked by a star "*" in the

CT-

Object

card. For more detailed information, please refer to the CT Analyzer

User Manual.

Figure 6-2

CT-Object

card with soft keys for predefined CT ratios if the number of taps is 5

37

38


6.2

MR-Config. Card

Use the

MR-Config.

card to configure the multi-ratio CT test. In this card, set

• the number of taps available on the CT,

• the "tap in use", i.e., the tap combination (ratio) which is actually used and connected to the operating burden during operation of the CT,

• the nominal CT ratios for the tap combinations,

• the nominal burden for each tap combination,

• and select the tap combinations you want to test during the multi-ratio CT test.

If necessary, use the cursor keys to scroll the table.

The current ratio I pn

/I sn

and the nominal burden for the full tap combination as well as the operating burden have to be specified in the

CT-Object

card, see


MR-Config.

card for a new multi-ratio CT test after selecting a predefined multi-ratio scheme for I pn

in the

CT-Object

card.

Fields underlined by dotted lines can be edited.

MR-Config.

card for a new multi-ratio CT test after specifying the values for I pn

, I sn and VA manually in the

CT-Object

card.

Figure 6-3

MR-Config.

card

The

MR-Config.

card can be switched to display

• the tap combinations or intertap combinations of the CT with

• the nominal burden values or the operating burden.

Refer to sections 6.2.1 and 6.2.2 on the following pages for more information.


6.2.1


The following soft keys are available if the

MR-Config.

card is selected but not

in edit mode (the card’s tab is highlighted as shown in Figure 6-3):

By default, the table in the

MR-Config.

card displays the nominal burden values. Use the

Op. Burden

soft key to display this table with the operating burden instead.

The soft key then changes to

Nom. Burden

to switch the table back to the nominal burden values.

For the nominal burden values the column header is "VA", for the operating burden values the column header is "Burden".

See "VA" and "Burden" on page 42 for more detailed information.

Using the

Common Tap to X#

soft key you can select the common tap (e.g. tap X5 instead of default tap X1). The common tap is the tap that is used as reference for all tap combinations (e.g. X1-X2,

X1-X3, X1-X4 etc. if the common tap is X1).

If the highest tap (e.g. X5) is selected as common tap, the soft key changes to

Common Tap to X1

.

The default common tap can be selected using the


option in the

Setting Menu


Use the

Show Inter Taps

soft key to display the intertap combinations instead of the tap combinations. If the intertap combinations are displayed, the soft key is labeled

Show Taps

.

Examples of tap combinations: X1-X2, X1-X3, X1-X4, etc.

Examples of intertap combinations: X2-X3, X2-X4, X3-X4, etc.

39

40


6.2.2

Parameters and Settings Used or Determined During the

Test


Number of Taps Overall number of tap connections available on the multiratio CT.


No. Taps 2

,

No. Taps 3

,

No. Taps 4

,

No. Taps 5

or

No. Taps 6

.

If the number of taps selected is 5 or 3, the

CT Analyzer

offers soft keys with predefined CT ratios when the "I-pn" field is selected in the

CT-Object

card (see ”I-pn” on page 36).

Tap in Use

The default number of taps can be selected using the


option in the

Setting Menu

, see

chapter 5 on page 33.

Note:

When testing a single-ratio CT using the

CT SB2

switch box, select

No. Taps 2

. However, single-ratio CT testing should preferably be performed using the normal single-ratio CT test mode of the

CT Analyzer

without using the

CT SB2

.

The tap combination actually used during operation of the

CT (e.g. X1-X4).

Select the tap combination using the soft keys (for example

X1-X5

,

X1-X4

). To select an intertap combination for the tap in use, press the

Show Inter Taps

soft key. The

MR-Config.

card then offers soft keys for the intertap combinations (for example

X2-X4

,

X3-X4

).

For the tap combination selected here, the

CT Analyzer

displays the detailed test results in the

Resistance

,

Excitation

and

Ratio

cards. The automatic test assessment in the

Assessment

card is however always done for the full tap combination given by the

Number of Taps

(e.g. for X1-X5 if number of taps = 5). See

sections 6.4 and 6.5 on page 47.

Note:

By default, the "Tap in Use" is set to the full tap combination given by the "Number of Taps".


Parameter

Taps

Ipn : Isn (A)

Description

This column lists all possible tap combinations of the CT

(e.g. X1-X5, X1-X4, X1-X3, ...). The number of available tap combinations depends on the number of taps specified in the "Number of Taps" field.

When the

MR-Config.

card is displayed but not in edit

mode (i.e., the card’s tab is highlighted as shown in Figure

6-3 on page 38) you can switch the common tap.

Example:

X1 is assumed as the default common tap, X5 as the highest available tap: Press the


soft key to use X5 as common tap instead of X1. The soft key then changes to


.

Using the

Show Inter Taps

soft key you can display the intertap combinations instead of the tap combinations. If the intertap combinations are displayed, the soft key changes to

Show Taps

.

Examples of intertap combinations: X2-X3, X2-X4, X3-X4.

Use this column to set the nominal current ratio I pn each tap combination.

/ I sn

for

The nominal ratio for the full tap combination (e.g. X1-X5 for a 5-tap CT) is automatically taken from the

CT-Object

card and cannot be changed in the

MR-Config.

card.

For all other tap combinations, I pn

can be changed or entered by the user. I sn

is always taken from the

CT-Object

card.

Note:

The

CT Analyzer

automatically performs a plausibility check for the ratios entered by the user. For example, an error message is displayed if the I pn higher than the I pn

entered for X1-X3 is

specified for X1-X4.

If a predefined multi-ratio scheme has been selected in the

CT-Object

card using the soft keys (see ”I-pn” on page 36),

the

CT Analyzer

automatically enters the nominal CT ratios for all tap combinations according to this scheme.

The ratios of the intertap combinations (e.g. X2-X4) are calculated from the tap combinations and cannot be changed by the user.

41

42


Parameter

VA cos ϕ

Burden cos ϕ

Description

Use this column to set the nominal burden for each tap combination.

To obtain correct measurement results, the nominal burdens for the inner tap combinations (e.g. X1-X2 etc.) should be smaller than the nominal burden for the full tap combination according to the winding ratios of the tap combinations (e.g. 25VA for X1-X5, 12.5VA for X1-X4 etc.).

The

CT Analyzer

supports this with an automatic function.

As soon as the primary current I pn

is specified for a tap combination, the

CT Analyzer

automatically calculates and sets the corresponding nominal burden and cos ϕ for this tap combination. For this, the

CT Analyzer

automatically scales down the nominal burden for the full tap combination according to the ratio of the specific tap combination and

rounds it to the next value stated in the standard (see Figure

6-3 on page 38).

The nominal burden (VA) automatically assigned by the

CT Analyzer

can be changed manually by the user for all tap and intertap combinations except the full tap combination. The cos ϕ cannot be changed by the user.

Note:

The "VA" column is displayed by default when opening the

MR-Config.

card the first time after initializing a new multi-ratio test. If the "Burden" column is displayed instead, use the

Nom. Burden

soft key to display the "VA" column with the nominal burdens again.

The "Burden" column is displayed if you selected to display the operating burden in the

MR-Config.

card using the

Op.

Burden

soft key.

This column displays the operating burden for the tap combination. The operating burden is taken from the

CT-Object

card and cannot be changed in the

MR-Config.

card. The same value is used for all tap combinations to test the behavior of the CT with the connected burden.


Parameter

Test

Description

In this column, select the tap combinations you actually want to measure during the multi-ratio CT test.

Select or deselect each single tap combination individually using the

Enable

and

Disable

soft keys. It is not possible to disable the full tap combination.

Disabling unused tap combinations reduces the test duration. Disabled taps are not measured. Therefore, no test results are available for disabled tap combinations.

Disabling a tap combination also disables the corresponding intertap combinations. It is not possible to disable a specific intertap combination.

43

44


6.3

MR-Results Card

After the multi-ratio CT test is finished, the

MR-Results

card shows the measurement results for each enabled tap combination and/or intertap combination.

If necessary, use the cursor keys to scroll the display.

Figure 6-4

MR-Results

card with measurement results: Page for

ratio

results (left) and page for

excitation

results (right)

The

MR-Results

card can be switched to display

• the ratio results or the excitation results (see ”Ratio results or excitation results” on page 46),

• the results for the tap combinations or the intertap combinations of the CT

(see

Show Inter Taps

and

Show Taps

on page 45), and

• the results with the nominal burdens or the operating burden (see section

6.3.2 on page 45).

6.3.1


The following soft keys are available in the

MR-Results

card.

Use this soft key to switch between the ratio results and the excitation results.

If the ratio results are displayed, the soft key is labeled

Show Excit.

to display the excitation results.

If the excitation results are displayed, the soft key is labeled

Show Ratio

to display the ratio results.


By default, the results are displayed for the nominal burden values.

Use the


soft key to display the results for the operating burden instead. The operating burden is the same for all tap combinations.

If the results are displayed for the operating burden, the soft key changes to


to toggle back to the results with nominal burden.

See section 6.3.2 below.

Using this soft key you can switch the unit for the phase error

("Pol. (’)" column) between minutes and degrees.

If the phase error is displayed in minutes, the soft key is labeled

Pol. in Degrees

. If the phase error is displayed in degrees, the soft key is labeled

Pol. in Min.

.

Using this soft key you can display the intertap combinations instead of the tap combinations.

If the tap combinations are displayed, the soft key is labeled

Show Inter Taps

. If the intertap combinations are displayed, the soft key is labeled

Show Taps

.

6.3.2

Test Results

Results with nominal burden or with operating burden

The measured or calculated results in the

MR-Results

card can be displayed for the nominal burden or for the operating burden. Select the burden to be used using the corresponding soft key


or

Results with

Nom. Burden

.

• When the results are displayed for the nominal burden, the "VA" and "cos ϕ

" fields on the top of the page show for each tap or intertap combination selected with the cursor in the "Taps" column the assigned nominal burden and cos ϕ

used for the measurement (e.g. 25VA for X1-X5, 12.5VA for X1-

X4 etc., as assigned in the

MR-Config.

card).

Using the

Show Inter Taps

soft key you can display the intertap combinations instead of the tap combinations.

• When the results are displayed for the operating burden, the "Burden" and

"cos ϕ

" fields on the top of the page display the operating burden specified on the

CT-Object

card. The operating burden is the same for all tap or intertap combinations.

45

46


Note:

Notice that the nominal burdens assigned to the tap combinations are scaled down from the nominal burden for the full tap combination according to the ratios! The

MR-Results

card will therefore show different results for the tap combinations when switching between the

results display with nominal burdens

and the

results display with operating burden

, even if identical values are specified for

VA

and

Burden

in the

CT-Object

card.

Hint:

Once the test is finished, it is possible to simulate the performance of the CT for other burden values than the nominal burden by changing the "Burden" value in the

CT-Object

card. The

CT Analyzer

then automatically performs a recalculation of the results for the new operating burden. Such simulations can be done at any time after the test is finished if the corresponding test file containing the measurement results of the CT is loaded in the

CT Analyzer

.

Ratio results or excitation results

The measurement results are displayed on two different pages (see Figure 6-4 on page 44). You can toggle these pages using the

Show Excit.

or

Show Ratio

soft key.

The following table lists the

ratio results

displayed in the

MR-Results

card.

Parameter

Ipn : Isec (A)

N

Rat. (%)

Pol. (’)

Pol. (°)

Description

This column shows for each tap combination the measured current ratio I pn

/ I sec

.

This column shows for each tap combination the measured winding ratio.

This column shows for each tap combination the measured ratio error in %.

This column shows for each tap combination the measured phase error (polarity) in minutes or degrees. Switch the unit using the

Pol. in Degrees

or

Pol. in Min.

soft key.

The following table lists the

excitation results

displayed in the

MR-Results

card.

Parameter

Rct (m

Ω

)

Vkn (V)

Ikn (mA)

Description


Knee point voltage.

Knee point current.


6.4

6.5

Parameter

Vb (V)

TCF

ALF

FS

Kssc

Description

The result displayed in this column depends on the standard selected in the

CT-Object

card and the type of CT.

V b

(IEEE C57.13, protection CTs only):

Rated secondary terminal voltage for protection CTs.

TCF

(IEEE C57.13, metering CTs only):

Transformer correction factor for metering CTs.

ALF

(IEC 60044-1, protection CTs only):

Accuracy limiting factor for protection CTs.

FS

(IEC 60044-1, metering CTs only):

Instrument security factor for metering CTs.

K ssc

(IEC 60044-6 only):

Rated symmetrical short-circuit current factor.

Resistance, Excitation and Ratio Card for Multi-

Ratio CT Testing

The

Resistance

card, the

Excitation

card and the

Ratio

card display the detailed test results for the tap combination specified as "Tap in Use" in the

MR-Config.

card.

Test Assessment for Multi-Ratio CT Testing

The automatic test assessment in the

Assessment

card is always performed for the full tap combination given by the

Number of Taps

(e.g. for X1-X5 if number of taps = 5).

47

48


Technical Data

7

7.1

7.2

Technical Data

Specifications

Specifications

Mains connection

Mains voltage

Mains fuses

Output voltage

Connector according to IEC 60320

100 - 240V

AC

/ 50/60Hz / 0.2A

2 x T2.0AH 250V,

(high-breaking capacity wire fuse 5 x 20mm)

0 - 120V

PC and CTA Interfaces

The

PC

interface of the

CT SB2

switch box is exclusively intended to connect the

CT SB2

to a computer (e.g. running the


software).

The

CTA

interface of the

CT SB2

switch box is exclusively intended to connect the

CT SB2

to a

CT Analyzer

.

PC interface

9-pole SUB-D connector, female

Outside view onto the sockets at the

CT SB2

!

9 nc

8 RTS (out)

7 CTS (in)

6 nc

5 GND (signal ground)

4 nc

3 RxD (data in / receive)

2 TxD (data out / transmit)

1 nc

Figure 7-1 PC interface on the

CT SB2

49

50


CTA interface

9-pole SUB-D connector, male

Outside view onto the pins at the

CT SB2

!

Figure 7-2 CTA interface on the

CT SB2

9-pole (DB9) null modem or crossover cable, 2 x female

Connections required:

1 2 3 4 5 6 7 8 shield

1 2 3 4 5 6 7 8 shield

Figure 7-3 Connection cable

CT SB2

to

CT Analyzer

Technical Data

7.3

Environmental Conditions

7.3.1

Climate

Climate

Operating temperature

Storage and transportation

Max. altitude

Humidity

–10 … +50 °C (14 … 122 °F)

–20 … +70 °C (–4 … 158 °F)

2000m

5 … 95% relative humidity, non-condensing

Tested acc. to IEC 60068-2-78, Cab, Damp

Heat: Temp. 40°C, duration 48h, rel. humidity 95%

7.3.2

Shock and Vibration

Dynamics

Vibration

Shock

Tested according to IEC 60068-2-6; frequency range 10 … 150 Hz; acceleration

2g continuous (20 m/s

2

); 20 cycles per axis

Tested according to IEC 60068-2-27

(operating mode); 15g / 11ms, half-sinusoid,

3 shocks in each axis

7.3.3

Mechanical Data

Weight, Dimensions and Protection

Weight 2.6kg (5.7lbs) without accessories

Dimensions W x H x D

Degree of protection

285 x 68 x 225mm

(11.2 x 2.7 x 8.9")

IP20 according to EN 60529

51

52


7.3.4

Safety Standards, Electromagnetic Compatibility (EMC)

CE Conformity, Requirements

The product adheres to the specifications of the guidelines of the Council of the European Community for meeting the requirements of the member states regarding the electromagnetic compatibility (EMC) Directive 2004/108/EC and the low-voltage Directive 2006/95/EC.

EMC

Emission

EN 61326-1 Class A

IEC 61326-1 Class A

FCC Subpart B of Part 15 Class A

Europe

International

USA

Immunity

Europe

International

Certified Safety Standards

Europe

International

USA

EN 61326-1

IEC 61326-1

EN 61010-1

IEC 61010-1

UL 61010-1


8

8.1

8.2


Care and Cleaning

The

CT SB2

does not require any special maintenance or care. Clean the device from time to time or as necessary using a cloth dampened with water or isopropanol alcohol. Always disconnect the

CT SB2

prior to cleaning!

Replacing Fuses

1. Turn off the

CT SB2

and unplug the power cord.

2. Ground the test object, and disconnect it from the

CT SB2

. By disconnecting it you prevent a possibly faulty test object from feeding power back into the

CT SB2

.

3. Disconnect the

CT SB2

from the

CT Analyzer

and, if applicable, from the computer.

4. Locate the blown fuse on the side panel of the

CT SB2

and replace it by an identical fuse type: T2.0A H 250V (2.0 Amps slow-acting high breaking capacity wire fuse 5 x 20mm). The

CT SB2

has two fuses of the same type.

53

54


9

Error and Warning Messages for the CT SB2

Error and Warning Messages for the

CT SB2

The

CT SB2

-specific error and warning messages of the

CT Analyzer

are listed in chapter "Error and Warning Messages" in the CT Analyzer User Manual.

55

56




Americas

OMICRON electronics Corp. USA

3550 Willowbend Blvd.

Houston, TX 77054, USA

Phone: +1 713 830-4660

Fax:

1 800-OMICRON

+1 713 830-4661 [email protected]

www.omicronusa.com

Asia – Pacific

OMICRON electronics Asia Ltd.

Suite 2006, 20/F, Tower 2

The Gateway, Harbour City

Kowloon, Hong Kong S.A.R.

Phone: +852 3767 5500

Fax: +852 3767 5400 [email protected]

www.omicron.at

Europe, Middle East, Africa

OMICRON electronics GmbH

Oberes Ried 1

A-6833 Klaus, Austria

Phone: +43 5523 507-333

Fax: +43 5523 507-999 [email protected]

www.omicron.at

For addresses of OMICRON electronics offices with customer service centers, regional sales offices or offices for training, consulting and commissioning please visit our Web site.

57

58


Index

A

accessories 16

Assessment card 47

B

block diagram 15

burden measurement

measurement setup 23

C

care and cleaning 53

climate conditions 51

contact information 57

CT Analyzer test cards

Assessment card 47

CT-Object card 36

MR-Config. card 38

MR-Results card 44

Resistance, Excitation, Ratio cards 47

CTA interface 14

CT-Object card 36

D

default settings on CT Analyzer 33

designated use 11

dimensions 51

E

electromagnetic compatibility (EMC) 52


equipotential bonding 8, 14

error and warning messages 55

Excitation card 47

F

functional components 13

fuse 14, 53

fuse replacement 53

G

grounding connector 14

H

hardware

block diagram 15

CTA and PC interface 14 fuse 14 grounding 14 mains connection unit 14 on/off switch 14

overview 13


weight & dimensions 51

hotline 57

I

interface, PC & CTA 14

M

mains fuse 14 mains socket 14

mains voltage 49

maintenance 53

measurement setup

burden measurement 23

general notes 19

multi-ratio CT testing 21


single-ratio CT testing 22

MR-Config. card 38

MR-Results card 44

multi-ratio CT testing

CT Analyzer test cards 35

default settings 33


short guide 25

O

on/off switch 14

operator qualifications 5

Index

59

60


P

PC interface 14

power supply 7, 49

primary winding resistance measurement


R

Ratio card 47

related documents 6

replacing fuse 53

Resistance card 47

S

safety

power supply 7

safe operation 8

safety rules 7

safety standards 5, 52


shock and vibration conditions 51

single-ratio CT testing


support 57

T

technical data

electromagnetic compatibility 52


safety standards 52

weight & dimensions 51

technical support 57

U

user maintenance 53

W

warning messages 55

weight 51