ABB RELION 611 Series Technical Manual page 337

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1MRS757454 D

Technical Manual

A051097 V6 EN

Operating principle of the trip-circuit supervision with an external

resistor. The TCSSCBR blocking switch is not required since the

external resistor is used.

If TCS is required only in a closed position, the external shunt resistance can be

omitted. When the circuit breaker is in the open position, TCS sees the situation as a

faulty circuit. One way to avoid TCS operation in this situation would be to block the

supervision function whenever the circuit breaker is open.

Supervision functions