whycircuit breaker is not connected at the generator end
where the capacity of the generator is more say 60MW, 100MW
etc.
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Answer Posted / kunal singh dabi
Due to following points
1)Transient Recovery Voltage (TRV)
2)Higher X/R value
3) Delayed current Zero
circuit breakers was not used after above 60 MW generators.
However please note that now full line of IEEE C37.013
qualified medium-voltage vacuum generator circuit breakers
for voltages up to 24 kV and generators up to 200 MW for
both indoor and outdoor applications are available in
market.
Please note that Circuit breakers applied to generator
switching applications are subject to conditions quite
different than those of a normal distribution circuit
breaker used in industrial, commerical and utility systems.
Distribution circuit breakers, whether of the outdoor
substation type or of the drawout type for use in metal-
clad switchgear, conform to IEEE C37.04 (basis of ratings),
IEEE C37.06 (preferred ratings), IEEE C37.09 (testing) and
IEEE C37.10 (application.)
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