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ABB Substation Automation
Products and Systems
1MRS750940-MUM
Technical Reference Manual
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 contacts with switches 1 and 2 of switchgroups SGR1...SGR4. On delivery from
factory the trip signals of all the protection stages are routed to both the PO1 and PO2
contacts.
The 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...SGR4. On delivery from the 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 contact 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:
one for measuring transformers, one for power supply and one for serial
communication.
Figure 4.2.1-1 Rear view of the overcurrent relay
REJ 523
49
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