1MRS 751802-MUM Protection RelayTechnical Reference Manual, Standard ConfigurationsREX 521149The CBFP signal is then connected to any of the output relays viaMain menu\Configuration\Output Signals\, and in this example thecircuit-breaker failure signal is connected to the power output 1, PO1.10.1.4.5. Trip-circuit supervisionThe trip-circuit supervision is available for the HSPO1 relay. If the resistance of thetrip circuit exceeds a certain limit, for instance due to a bad contact or oxidation, thesupervision function will be activated and a trip-circuit supervision alarm signal isprovided after an adjustable delay time. The settings for the function can be foundin Main menu\Cond. monit.\TCS\.To avoid unnecessary alarms the trip-circuit supervision can be blocked by the BSsignal, which disables the supervision output when the circuit breaker is open. TheBS signal is configured to be operated by the “CB pos. open” status from the selecteddigital input. The BS signal can be connected via the switchgroup inMain menu\Configuration\Input SWGRP\TCS\. The default setting ofthe parameter is ”Not in use”.Another solution is to use an external resistor to prevent the TCS alarm. Please referto Technical Reference Manual, General (1MRS 751108-MUM) for moreinformation about the trip-circuit supervision.Avt #$ 8rpvqvht
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