Inputs; Outputs; Circuit-Breaker Failure Protection; Disturbance Recorder - ABB REJ 527 Technical Reference Manual

ABB Substation Automation
Products and Systems
4.1.1.3.
4.1.1.4.
4.1.1.5.
4.1.1.6.
4.1.1.7.
1MRS750616-MUM
Technical Reference Manual

Inputs

The relay includes two 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 9, 32 and 36.

Outputs

The relay is provided with two power outputs (PO1 and PO2) and two signal outputs
(SO1 and SO2). Switchgroups SGR1...6 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.

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".
REJ 527
11