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REU 513
2.1.1.3.
2.1.1.4.
2.1.1.5.
2.1.1.6.
2.1.1.7.
14
User's Guide
Inputs
The relay includes three energizing inputs and one external binary input controlled
by an external voltage. The function of the binary input is determined with selector
switches of the protection relay.
For more details of the inputs, refer to section 2.2.1. Input / output connections and
tables 9, 31 and 35.
Outputs
The relay is provided with two power outputs (PO1 and PO2) and two signal outputs
(SO1 and SO2). Switchgroups SGR1...8 are used for routing the start and trip signals
of any protection stage to the desired signal or power output.
Circuit-breaker failure protection
The relay features a circuit-breaker failure protection (CBFP) unit. The CBFP unit
generates a trip signal via output PO2 after the set operate time 0.10 s...1.00 s if the
fault has not been cleared by that time.
Normally, the CBFP unit controls the upstream circuit breaker. It can also be used
for tripping via redundant trip circuits of the same circuit breaker if the circuit
breaker is provided with two trip coils. The circuit-breaker failure protection unit is
activated with a switch of switchgroup SGF.
Disturbance recorder
The relay includes an internal disturbance recorder, which records momentary
measured values, external BI signal and states of the internal protection stages. The
disturbance recorder can be set to be triggered on operation of stages or on an
external BI signal, either on the falling or rising trigger edge.
Self-supervision
The relay is provided with an extensive self-supervision system that continuously
supervises the software and the electronics of the relay. It handles run-time fault
situations and informs the user about an existing fault.
When a fault is detected, the relay first tries to eliminate it by restarting. Only after
the fault is found to be permanent, the green READY indicator starts to blink and
the protection relay delivers a fault signal to the self-supervision output contact. The
self-supervision output contact that is normally picked up drops off and a fault code
can be read from the relay. This code is a number that identifies the fault type. The
fault code shall be recorded, and stated when service is ordered.
The fault codes are listed in the following table.
ABB Substation Automation
Products and Systems
1MRS750886-MUM
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