GE

Digital Energy

INSTRUCTIONS

Model JVS and

JVT SUPERBUTE

™

Station Class Voltage Transformers

Dry-type, Butyl-molded 150kV to 350kV BIL

GEI-52524E Issue 11/2014

Introduction

The Model JVS and JVT SUPERBUTE station class voltage transformers are of the dry-type, butyl-molded construction and are for indoor and outdoor use. The full model name and BIL’s are shown in Table 1, below:

BIL (kV)

150

200

250

350

Nominal System Voltage (kV)

Table 1 – Model Selection Guide

25

34.5

46

69

Single-bushing Model

JVS-150

JVS-200

JVS-250

JVS-350

Two-bushing Model

JVT-150

JVT-200

JVT-250

JVT-350

The Type JVS transformers have a single high-voltage line terminal and an insulated neutral terminal. They are designed for line-to-ground connection on grounded systems. If it should become necessary to apply these VT’s to systems which are ungrounded or grounded through high impedance, refer to the nearest General Electric Sales Office for a system analysis study. These VT’s are capable of operating at 173 percent of rated voltage for one minute without exceeding

175°C temperature rise.

The Type JVT transformers have two high-voltage line terminals and are designed for line-to-line connection on a circuit where the nominal line-to-line voltage is essentially the same as the rated primary voltage of the transformer. They may also be connected line-to-neutral or line-to-ground on a circuit in which the nominal line-to-line voltage is essentially the same as the rated primary voltage of the transformer. In this latter case the transformers are operating with reduced voltage and reduced excitation, 58 percent of normal.

For information on unusual ratings of frequency and voltage, or on installations where unusual conditions exist, consult the nearest General Electric Sales Office. When special information is requested, give the catalog number and serial number to aid in identifying the transformer.

NOTE: In addition to this instruction book, further general information on dry-type instrument transformers can be found in instruction GEH-230.

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Figure 1 - Type JVS-200 VT, 200kV BIL Figure 2 - Type JVT-200 VT, 200kV BIL

Figure 3 - Type JVS-350 VT, 350kV BIL

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Figure 4 - Type JVT-350 VT, 350kV BIL

Before Installation

Inspection

Immediately upon receiving the transformer, inspect it for physical damage that may have occurred during shipment or handling. If damage is evident, file a claim with the transportation company immediately and promptly notify the nearest General Electric Sales Office.

The Types JVS and JVT butyl-molded transformers are physically impervious to moisture. If, due to unusual circumstances, insulation tests indicate the possibility of the entrance of moisture, refer to the nearest

GE Sales Office for detailed information on proper procedure.

Testing

Insulation tests should be made in accordance with IEEE Std C57.13-2008. Initial user tests should not be in excess of 75% of the factory test voltage. Periodic field test of insulation should not exceed 65% of the factory test voltage.

On JVS Types, the ground strap from H2 to the base can be readily removed for testing.

Note that IEEE Std C57.13-2008 specifies a 19kV factory primary-applied potential test on outdoor-type voltage transformers with insulated neutral. With the strap removed, the JVS types can be tested as an insulated-neutral-terminal type.

For ratio and phase-angle tests, refer to IEEE Std C57.13-2008.

Installation

Safety Precautions

1. Always consider an instrument transformer as a part of the circuit to which it is connected, and do not touch the leads and terminals or other parts of the transformer unless they are adequately grounded.

2. The insulation surface of molded transformers should be considered the same as the surface of a porcelain bushing, since a voltage stress exists across the entire insulation surface from terminals to grounded metal parts.

3. Always ground the metallic cases, frames, bases, etc., of instrument transformers. The secondaries should be grounded close to the transformers. However, when secondaries of transformers are interconnected, there should only be one grounded point in this circuit to prevent accidental paralleling with system grounding wires.

4. Never short-circuit the secondary terminal of a voltage transformer. Such a short circuit will cause the unit to overheat and fail in a very short period of time.

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Handling

The Types JVS and JVT butyl-molded transformers are less fragile than porcelain, HCEP, and other epoxy insulated transformers, but nevertheless should be handled with care. It is recommended that, whenever possible, the transformer be left attached to its shipping pallet and moved in this manner up to the actual installation site.

The transformer can be lifted by means of a sling attached as in Fig. 5.

Figure 5 - Method of lifting transformers with slings

Mounting

These voltage transformers can be mounted in any position: upright, horizontal, or even inverted. Connections to power and distribution lines should be made in such a manner as to avoid placing appreciable strain upon the voltage transformer bushings and terminals. The outline drawings for the JVS and JVT transformers are shown in

Fig. 7 through 14.

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Connections

The resistance of all connections should be kept at a minimum to prevent overheating of the terminals and to keep voltage drop to a minimum. The resistance of the secondary leads should be kept as low as practical, since the voltage drop in the leads affects both the magnitude and phase of the voltage appearing at the instruments and meters.

A detachable conduit box is provided for housing the secondary terminals. Two 1 ½ inch threaded horizontal hubs with pipe plugs are provided for making connection to 1 ½ inch conduit. A knockout is also provided on the bottom of the box for use in locations requiring bottom connection. A lock nut and bushing will be required if a smaller diameter conduit is used. The transformer may be taken out of service without dismantling the conduit merely by disconnecting the secondary leads and removing the four conduit-box mounting screws.

Grounding

A good, permanent, low-impedance ground is essential for adequate protection. The conduit box (Fig. 6) contains a provision for grounding the secondary to the transformer base. Also a ground connector, designed to accept ground wires in the range of No. 2 solid through 500-MCM cable, is provided on the transformer base.

Pipe Plug Box Mounting Holes (4)

Ground Screw

GRD

Bushing

1

1

/

2

" Knockout

Lock Nut

Conduit

Figure 6 - Conduit Box connections

Polarity

When wiring instrument transformer circuits, it is necessary to maintain the correct polarity relationship between the line and the devices connected to the secondaries. The relative instantaneous polarity of each winding is indicated by a marker near each primary and secondary terminal. Where taps are present, all terminals are marked in order. The primary terminals are H1 and H2; the secondary terminals X1, X2, X3, etc; and the tertiary terminals Y1, Y2, Y3, etc., if another secondary is provided. H1 always indicates the same instantaneous polarity as X1 and Y1. Instantaneous current flow may be visualized as into H1 and out of X1 and Y1 in the full winding connection (out of X2 and Y2 on the tap connection).

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High Altitude Operation

These transformers are designed to operate over the ambient temperature range as indicated at the standard ratings

(see nameplate), provided the altitude does not exceed 3300 feet. If the transformers are to be used above 3300 feet, consult IEEE Standard C57.13-2008 for the effect of altitude on temperature rise.

Maintenance

Whether mounted indoors or outdoors, these voltage transformers require no special care other than keeping the insulation surfaces free from accumulation of dirt.

Cleaning

Butyl-molded transformers may be cleaned by scrubbing the butyl surface with detergent and a stiff brush to remove accumulated dirt. Remove the detergent by washing with clean water.

Disclaimer

These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with the installation, operation or maintenance. The equipment covered by these operating instructions should be operated and serviced only by competent technicians familiar with good safety practices, and these instructions are written for such personnel and are not intended as a substitute for adequate training and experience in safe procedures for this type of equipment. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter should be referred to the

General Electric Company.

Product Dimensions

Transformer outline dimensions with six-secondary terminal configuration are illustrated in Fig. 7-14 below.

The complete list of outline drawing numbers for the various secondary terminal configurations are referenced in Table 2 below.

For a copy of any of the following outline drawings in PDF or AutoCAD format, and to ensure you have the latest revision, please contact your nearest General Electric Sales Office. GE reserves the right to make changes to product at any time without notice and without obligation to notify any person of such changes.

Secondary Configuration Ratio Type Model JVS-150 Model JVS-200 Model JVS-250 Model JVS-350

Two secondary terminals Single Ratio

Three secondary terminals Tap Ratio

Four secondary terminals Dual Ratio

9926396001

9926396002

9926396003

9926597001

9926597002

9926597003

9935411001

9935411002

9935411003

9926369001

9926369002

9926369003

Six secondary terminals Dual/Tapped Ratio 9926396004 9926597004 9935411004 9926369004

Secondary Configuration Ratio Type Model JVT-150 Model JVT-150 Model JVT-250 Model JVT-350

Two secondary terminals Single Ratio

Three secondary terminals Tap Ratio

9926175001

9926175002

Four secondary terminals Dual Ratio

Six secondary terminals

9926175003

Dual/Tapped Ratio 9926175004

Table 2 – Outline Drawing Number for Models JVS and JVT

9926175001

9926175002

9926175003

9926175004

9928789001

9928789002

9928789003

9928789004

9926391001

9926391002

9926391003

9926391004

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Single Bushing Voltage Transformers

JVS150

Figure 7 - Outline dimensions for Model JVS150 (shown with six-terminal configuration)

JVS200

Figure 8 - Outline dimensions for Model JVS200 (shown with six-terminal configuration)

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JVS250

Figure 9 - Outline dimensions for Model JVS250 (shown with six-terminal configuration)

JVS350

Figure 10 - Outline dimensions for Model JVS350 (shown with six-terminal configuration)

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Double Bushing Voltage Transformers

JVT150

Figure 11 - Outline dimensions for Model JVT150 (shown with six-terminal configuration)

JVT200

NOTES:

1. TOLERANCES ARE +/- 0.25 INCHES AND +/- 6mm

2. CREEP DISTANCE = 27" [686mm]

3. STRIKE DISTANCE = 13" [330mm]

4. WEIGHT = 225 LBS [102kg]

Figure 12 - Outline dimensions for Model JVT200 (shown with six-terminal configuration)

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JVT250

Figure 13 - Outline dimensions for Model JVT250 (shown with six-terminal configuration)

JVT350

Figure 14 - Outline dimensions for Model JVT350 (shown with six-terminal configuration)

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GEI-52524E (11/2014)