Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit automatically reconnected only after the fault is...
Patent
1991-11-08
1993-08-31
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit automatically reconnected only after the fault is...
361 95, 361 93, H02H 208, H02H 300
Patent
active
052414442
ABSTRACT:
The disclosed fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect to time. If the rising current also opens a circuit breaker within a predetermined time and cuts off current to the cable, the indicator trips. If no zero current occurs within the time period, the trip arrangement is disarmed for the next current rise.
REFERENCES:
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patent: 3735248 (1973-02-01), Reese
patent: 3959704 (1976-05-01), McCrea
patent: 4223365 (1980-11-01), Moran
patent: 4543570 (1985-12-01), Bressert et al.
patent: 4733321 (1988-03-01), Lindeperg
patent: 5029039 (1991-07-01), Yeh
Pacific Scientific Company
Stephan Steven L.
To E.
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