Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit automatically reconnected only after the fault is...
Patent
1989-06-30
1991-01-08
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 96, H02H 308
Patent
active
049841246
ABSTRACT:
The disclosed faulted current indicator senses current in a line having a breaker or fuse, and avoids tripping in response to current inrush signals by producing a trip signal in response to an overcurrent occurring for an overcurrent duration which is inversely related to the magnitude of the overcurrent and is faster than the overcurrent operating time of the breaker or fuse. In one embodiment, this involves operating a current protection device in response to an overcurrent occurring for a second overcurrent duration inversely related to the magnitude of the overcurrent according to a first characteristic, and adjusting the first overcurrent duration to follow a second characteristic having variations substantially the same as the first characteristic but having a shorter first overcurrent duration than the second overcurrent duration.
REFERENCES:
patent: 3715742 (1973-02-01), Schweitzer, Jr.
patent: 4733321 (1988-03-01), Lindeporg
Jennings Derek S.
Sigma Instruments Inc.
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