A051906-ANSI V2 EN
Figure 428: 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.
Section 6 1MAC059074-MB A
Supervision functions
838 615 series ANSI
Technical Manual
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