Circuit breaker including selectively operable long-time-delay t

Details Circuit breaker including selectively operable long-time-delay t Circuit breaker including selectively operable long-time-delay t

1988-08-02

1989-08-15

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 340662, H02H 3093

Patent

active

048580589

ABSTRACT:
In a circuit breaker, a timer circuit is employed for delay interrupting operation in case of line failure. The timer circuit includes at least a peak value converting circuit, an effective value converting circuit, a switch, and a switching control circuit. When the failure current is lower than a predetermined threshold level, a long-time delay tripping circuit of the timer circuit is operated in response to an effective value voltage from the effective value converting circuit. When the fail current exceeds over the threshold level, the long-time delay tripping circuit is operated in response to a peak value voltage from the peak value converting circuit so as to avoid an adverse influence of the saturation characteristic of the current transformer.

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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