5.Trip-Circuit Supervision - ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS 751802-MUM
10.1.4.5.
Protection Relay
Technical Reference Manual, Standard Configurations
The CBFP signal is then connected to any of the output relays via
Main menu\Configuration\Output Signals\, and in this example the
circuit-breaker failure signal is connected to the power output 1, PO1.
Trip-circuit supervision
The trip-circuit supervision is available for the HSPO1 relay. If the resistance of the
trip circuit exceeds a certain limit, for instance due to a bad contact or oxidation, the
supervision function will be activated and a trip-circuit supervision alarm signal is
provided after an adjustable delay time. The settings for the function can be found
in Main menu\Cond. monit.\TCS\.
To avoid unnecessary alarms the trip-circuit supervision can be blocked by the BS
signal, which disables the supervision output when the circuit breaker is open. The
BS signal is configured to be operated by the "CB pos. open" status from the selected
digital input. The BS signal can be connected via the switchgroup in
Main menu\Configuration\Input SWGRP\TCS\. The default setting of
the parameter is "Not in use".
Another solution is to use an external resistor to prevent the TCS alarm. Please refer
to Technical Reference Manual, General (1MRS 751108-MUM) for more
information about the trip-circuit supervision.
Control signal for selecting
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Overcurrent TRIP Alarm
Earth-fault TRIP Alarm
Circuit breaker failure
protection
Blocking signal to incoming feeder
(START 3I>>)
CLOSE circuit breaker
TRIP circuit breaker
149