Backup trip circuit for a circuit breaker

Details Backup trip circuit for a circuit breaker Backup trip circuit for a circuit breaker

1980-11-25

1982-09-28

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 93, H02H 324

Patent

active

043521380

ABSTRACT:
A backup trip circuit is provided for an electronically controlled recloser or circuit breaker which requires a constant voltage direct current supply for its normal tripping circuit. Whenever the normal DC supply voltage drops below the minimum level, a capacitor is coupled to and charged by, the distribution line current. Then, whenever the line current exceeds a selected magnitude for a selected period of time, the capacitor is discharged through the trip coil of the breaker to open this distribution line.

REFERENCES:
patent: 3386006 (1968-05-01), Runge
patent: 3590325 (1971-06-01), McMillen et al.
patent: 3740738 (1973-06-01), Kosanovich et al.
patent: 3769550 (1973-10-01), Lee
patent: 3803455 (1974-04-01), Willard
patent: 3843908 (1974-10-01), Priegnitz
patent: 4027203 (1977-05-01), Moran et al.

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