Inputs; Outputs; Circuit-Breaker Failure Protection; Disturbance Recorder - ABB REU 523 Technical Reference Manual

1MRS 750942-MUM
4.1.1.3.
4.1.1.4.
4.1.1.5.
4.1.1.6.
4.1.1.7.
4.1.1.8.
ABB Automation
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual

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 4.2.1. Input / output connections and
tables 4.1.3.6-6, 4.2.1-1 and 4.2.1-5.

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.
The CBFP unit can 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.

MMI module

The MMI of the relay is equipped with six push-buttons and an alphanumeric LCD
for 2 x 16 characters. The push-buttons are used for navigating in the menu structure
and for adjusting set values.
An MMI password protects all user-changeable values from being changed by an
unauthorised person. The default value for the MMI password is "999". With the
default value the password is not active and it is not required for altering parameter
values. For further information, refer to "Operator's Manual".

Self-supervision

The self-supervision system of the relay handles run-time fault situations and
informs the user about an existing fault. When the self-supervision system detects a
permanent internal relay fault, the ready indication LED starts blinking. At the same
time the self-supervision alarm relay that is normally picked up drops off and a fault
code appears on the display. This code is a number that identifies the fault type. For
fault codes, refer to section "Internal fault" in "Operator's Manual".
REU 523
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