1MRS751802-MUM
REX 521
179
Protection Relay
Technical Reference Manual, Standard Configurations
The CBFP signals from the protection functions are routed to the output signals via
the output switchgroups. These settings can be found in
Main menu\Configuration\Output SWGRP\CBFP
. When the two-stage
overcurrent, the two-stage directional earth fault, the unbalance and thermal
overload protection are selected the checksum for CBFP will be 221.
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.
10.1.4.5.
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.\TCS1\
.
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\TCS1\
. The default setting of
the parameter is ”Not in use”.
Another solution is to use an external resistor to prevent the TCS1 alarm. Refer to
REX 521 Technical Reference Manual, General
documents) for more information about the trip-circuit supervision.
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