ABB REJ 527 Technical Reference Manual page 49

Directional or non-directional earth-fault relay

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ABB Substation Automation

Products and Systems

1MRS750616-MUM

Technical Reference Manual

The binary input X2.1/17-18 can be used in four different ways: as the binary input

1) for an external blocking signal, 2) for unlatching the trip relay, 3) for the remote

control of relay settings or 4) for changing the operation characteristic. The

requested function is selected with the switches of switchgroup SGB. The binary

input can also be used as a trigger signal for the disturbance recorder; this function

is selected with SPA parameter V243.

The auxiliary supply voltage of the relay is connected to terminals X2.1/1-2. At dc

supply the positive lead is connected to terminal X2.1/1. For further details, see the

description of the auxiliary voltage. The permitted auxiliary voltage range of the

relay is marked on the front panel of the relay.

Output contacts PO1 and PO2 are heavy-duty trip contacts, capable of controlling

most circuit breakers. The operate signals of different protection stages are routed to

the relays with switches 1 and 2 of switchgroups SGR1...SGR6. On delivery from

factory the trip signals of all the protection stages are routed to both the PO1 and

PO2 contacts.

Output contacts SO1 and SO2 can be used for signalling on operation of the relay.

The signals to be routed to the output contacts SO1 and SO2 are selected with

switches 3 and 4 of switchgroups SGR1...SGR6. On delivery from factory the start

signals of all the protection stages are routed to both the SO1 and SO2 contacts.

Output contact IRF functions as an output contact for the self-supervision system of

the protection relay. The IRF relay is energized under normal operating conditions

and contact gap X2.1/13-15 is closed. If a fault is detected by the self-supervision

system, or on loss of the auxiliary supply, the output contact drops off and contact

X2.1/13-14 closes.

In the following picture, a rear view of the relay, showing three connecting sockets:

X1.1 for measuring transformers, X2.1 for power supply, output contacts and binary

input and X2.2 for serial communication.

REJ 527

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