IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
This output is intended for closing of the GCB using ON coil if a circuit breaker is
used as GCB. The output provides 2 sec pulse when the GCB has to close. If
synchronizing is disabled with the particular breaker, the pulse length is extended
to 5sec. See timing diagram of all available breaker control outputs in the
description of the GCB close/open output.
There are also other outputs availabe for GCB control:
GCB close/open
GCB OFF coil
GCB UV coil
Binary output: GCB OFF Coil
This output is intended for opening of the GCB using OFF coil if a circuit breaker
is used as GCB. The output provides 2 sec pulse when the GCB has to open. If
synchronizing is disabled with the particular breaker, the pulse length is extended
to 5sec. See timing diagram of all available breaker control outputs in the
description of the GCB close/open output.
There are also other outputs availabe for GCB control:
GCB close/open
GCB ON coil
GCB UV coil
Binary output: GCB UV Coil
This output is intended for opening of the GCB using an undervoltage coil if a
circuit breaker is used as GCB.
The output is closed after the gen-set has been started, Min stab time has
elapsed and the generator voltage and frequency has got into limits. GCB
closing command is blocked for 1 sec after the UV coil has been closed to
allow the breaker mechanical system getting ready for closing.
The output is opened for 2 sec when the GCB has to open. If
synchronizing is disabled with the particular breaker, the length of the
inverse pulse is extended to 5sec.
The output is closed again and remains closed while the generator
voltage and frequency are in limits, if the Running phase follows after
opening of the GCB (e.g. in MAN).
The output remains opened if the Cooling phase follows after opening of
the GCB.
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