1MRS750527-MUM

4.

4.1.

Feeder Terminal

Technical Reference Manual, General

Instructions

REF 54_

Application

The REF 54_feeder terminals are designed to be used for the protection, control, measurement and supervision of medium voltage networks. They can be used with different kinds of switchgear including single busbar, double busbar and duplex systems. The protection functions also support different types of networks, such as isolated neutral networks, resonant-earthed networks and partially earthed networks.

Control room connection

RER 111 LON star-coupler

Optical LON bus

CB OK

21 kV

AROFF

REF 541

Uaux = 80...265 Vdc/ac

In = 1/5 A (I)

Ion = 1/5 A (Io)

Uon = 100/110 V (Uo)

1MRS xxxxxx

98150

CB OK

21 kV

AROFF

REF 541

CB OK

21 kV

AROFF

REF 541

CB OK

21 kV

AROFF

REF 541

Uaux = 80...265 Vdc/ac

In = 1/5 A (I)

Ion = 1/5 A (Io)

Uon = 100/110 V (Uo)

1MRS xxxxxx

98150

Uaux = 80...265 Vdc/ac

In = 1/5 A (I)

Ion = 1/5 A (Io)

Uon = 100/110 V (Uo)

1MRS xxxxxx

9509 fn = 50 Hz

In = 1/5 A (I)

Ion = 1/5 A (Io)

Un = 100/110 V (U)

98150

9509

A050181

Fig. 4.1.-1 Distributed protection and control system based on REF 54_ feeder terminals

The functionality available for REF 54_ depends on the selected functionality level

(refer to Section “Ordering Information” on page 103) and is also tied to the

hardware configuration. The desired functions can be activated from a wide range of protection, control, measurement, power quality, condition monitoring, general and communication functions within the scope of I/O connections, considering the total CPU load. Compared to the traditional use of separate products, the combination of desired functions provides cost-effective solutions and, together with the relay configuration (IEC 61131-3 standard), allows the REF 54_ feeder terminals to be easily adapted to different kinds of applications.

By means of the graphic HMI display, the control functions in the feeder terminal indicate the position of disconnectors or circuit breakers locally. Further, the feeder terminal allows position information from the circuit breakers and the disconnectors to be transmitted to the remote control system. Controllable objects, such as CBs,

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REF 54_

Feeder Terminal

Technical Reference Manual, General

1MRS750527-MUM can be opened and closed over the remote control system. Position information and control signals are transmitted over the serial bus. Local control is also possible via the push-buttons on the front panel of the feeder terminal.

The feeder terminal is designed to be used for the selective short-circuit and earthfault protection. The feeder protection type REF 54_ includes overcurrent and earthfault functions and is used for feeder short-circuit, time overcurrent and earth-fault protection in solidly, resistant or resonant-earthed networks and in isolated neutral networks. When desired, auto-reclosing is achieved by using the auto-reclose function. Up to five successive auto-reclose cycles can be carried out. For an

example application with basic functions, see Fig. 4.1.-2 below.

COIND

COCB

0 1

+

0

1

+

+

3

3

AR5Func

0 1

MECU3A

I

MEVO3A

U

MEPE7

P

Q

E

Cos j

NOC3Low

3I>

+

Io

Uo

DEF2Low

Io>

A050182

Fig. 4.1.-2 Basic functions of the integrated feeder terminal REF 54_

In addition, REF 54_ offers protection functions for a large variety of applications, such as frequency and voltage based protection, motor protection, thermal overload protection, capacitor bank protection and synchro-check/voltage check function.

The REF 54_ terminal measures phase currents, phase-to-phase or phase-to-earth voltages, neutral current, residual voltage, frequency and power factor. Active and reactive power is calculated from measured currents and voltages. Energy can be calculated on the basis of the measured power. The measured values can be indicated locally and remotely as scaled primary values.

With the condition monitoring functions the REF 54_ feeder terminal monitors for example gas pressure and breaker wear, registers the operate time and provides scheduled time intervals for maintenance.

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1MRS750527-MUM

4.2.

4.3.

Feeder Terminal

Technical Reference Manual, General

REF 54_

In addition to protection, measurement, control and condition monitoring functions, the feeder terminals are provided with a large amount of PLC functions allowing several automation and sequence logic functions needed for substation automation to be integrated into one unit. The data communication properties include SPA bus communication, LON bus communication, IEC 60870-5-103

1

communication,

DNP 3.0 communication or Modbus communication with higher-level equipment.

Further, LON communication, together with PLC functions, minimizes the need for hardwiring between the units.

Requirements

If the environmental conditions differ from those specified in section “Technical data”, as to temperature and humidity, or if the atmosphere around the feeder terminal contains chemically active gases or dust, the terminal should be visually inspected in association with the secondary testing. The visual inspection should focus on:

• signs of mechanical damage to the feeder terminal case and terminals,

• dust on the feeder terminal cover or case, and

• signs of corrosion on terminals, on the case or inside the feeder terminal.

For information about the maintenance of feeder terminals, refer to Section

“Service” on page 101.

Feeder terminals are measuring instruments and should be handled with care and protected against moisture and mechanical stress, especially during transport.

Terminal configuration

The REF 54_ feeder terminals are adapted to specific applications by using the

Relay Configuration Tool included in the CAP 505 tools. This tool is used for configuring the basic terminal, protection and logic function blocks, control and measurement functions, timers and other functional elements included in the logic

functions category (refer to Section “Feeder terminal configuration” on page 28).

The MIMIC picture, alarm texts and LED indicators are configured with the Relay

Mimic Editor (refer to Section “MIMIC configuration” on page 29).

The configuration of LON network is described in section “LON network configuration” on page 31. If the application includes no horizontal communication,

network variables are not needed and the section about LON network configuration is thus not relevant.

The customer can configure the REF 54_ feeder terminal according to own functional requirements and preferences or utilize the pre-engineered configuration solutions.

For more detailed information about the configuration, refer to the Configuration

Guideline and the tool-specific manuals (refer to Section “Related documents” on page 10).

1. IEC 60870-5-103 later referred as IEC_103.

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