Circuit breaker apparatus including asymmetrical fault detector

Details Circuit breaker apparatus including asymmetrical fault detector Circuit breaker apparatus including asymmetrical fault detector

1976-09-30

1978-08-01

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 98, 361110, H02H 308

Patent

active

041046919

ABSTRACT:
A circuit breaker apparatus is taught which includes three time delayed modes of interruption and an instantaneous interruption. A long time delay mode is taught for interrupting overload current in the line to be protected. The latter time delay is inversely proportional to the square of the overload current. A short time delay mode is taught for providing a circuit breaker tripping operation after a predetermined fixed time delay when the current flowing in the line to be protected exceeds a predetermined amount. An asymmetrical fault detecting range of interruption is taught which overlaps the region of overload current which normally would require an instantaneous tripping of the circuit breaker as a function of the properties of the circuit breaker but which nevertheless delays interruption of the circuit breaker for a relatively short period of time to test subsequent peaks of the fault or overload current to determine if the latter current decays to a value which does not necessitate quick tripping of the circuit breaker during the delay period. The latter case is related to the occurrence of a fully offset asymmetrical transient fault condition.

REFERENCES:
patent: 3689801 (1972-09-01), Engel et al.
patent: 3818275 (1974-06-01), Shimp
patent: 3956670 (1976-05-01), Shimp et al.

Affiliated with

Also associated with

Rating

Circuit breaker apparatus including asymmetrical fault detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit breaker apparatus including asymmetrical fault detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit breaker apparatus including asymmetrical fault detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1983464