ABB REJ 527 Technical Reference Manual page 49

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
49