Circuit breaker

Details Circuit breaker Circuit breaker

1988-12-23

1989-09-12

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 86, 361 94, 340662, H02H 308

Patent

active

048665584

ABSTRACT:
A time delay circuit of a circuit breaker has: a comparator (35) for comparing an input signal (Ex) and a reference value (Ey) and for switching on and off for charging of a capacitor (38); a reference voltage setting circuit (37) for setting the reference voltage (Ey) corresponding to a value of a rated current of an A.C. power line; a processing circuit (45) for calculating a ratio of the input voltage (Ex) corresponding to a value of overcurrent to the reference voltage (Ey); and a voltage/current conversion circuit (44) for converting an output voltage of the processing circuit (Ez) to a current output (Ib) which is to be charged in the capacitor (38) for determining a delay time.

REFERENCES:
patent: 4224651 (1980-09-01), Allen et al.
patent: 4347541 (1982-08-01), Chen et al.
patent: 4763220 (1988-08-01), Belbel et al.

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