ABB RELION 620 Series Technical Manual page 587

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1MAC504801-IB E

620 series ANSI

Technical Manual

A051906-ANSI V2 EN

Operating principle of the trip-circuit supervision without an external

resistor. The circuit breaker open indication is set to block TCM when the

circuit breaker is open.

Trip circuit supervision and other trip contacts

It is typical that the trip circuit contains more than one trip contact in parallel, for example

in transformer feeders where the trip of a Buchholz relay is connected in parallel with the

feeder terminal and other relays involved. The supervising current cannot detect if one or

all the other contacts connected in parallel are not connected properly.

Supervision functions

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