Long-time and short-time overcurrent signal processor for...

Details Long-time and short-time overcurrent signal processor for... Long-time and short-time overcurrent signal processor for...

H - Electricity

02

H

348/26

H02H 3/093 (2006.01) H02H 7/30 (2006.01)

Patent

CA 1138985

41PR-3271 LONG-TIME AND SHORT-TIME OVERCURRENT SIGNAL PROCESSOR FOR CIRCUIT BREAKER STATIC TRIP UNITS ABSTRACT An overcurrent signal is replicated by current mirrors for joint processing by a long-time trip mode network and a short-time trip mode network pursuant to initiating a circuit breaker trip function after an adjustably predetermined delay predicated on the over- current signal magnitude. The former network measures signal against a sloping I2t portion of an established trip time curve, while the latter optionally measures the overcurrent signal against a second I2t curve por- tion terminating in a selected one of plural fixed time delay curve portion. Short-time delay zone selective interlocking between upstream and downstream breakers and long-time delay pickup indication are also disclosed.

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