Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit automatically reconnected only after the fault is...
Patent
1989-08-07
1991-07-02
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit automatically reconnected only after the fault is...
361 93, 361 95, H02H 208
Patent
active
050290398
ABSTRACT:
A 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:
patent: 3673455 (1972-06-01), Dewey
patent: 3715742 (1973-02-01), Schweitzer, Jr.
patent: 3735248 (1973-05-01), Reese
patent: 4223365 (1980-09-01), Moran
patent: 4543570 (1985-09-01), Bressert
patent: 4733321 (1988-03-01), Lindeperg
Jennings Derek S.
Sigma Instruments Inc.
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