Faulted current indicators and inrush restraints therefor

Details Faulted current indicators and inrush restraints therefor Faulted current indicators and inrush restraints therefor

1989-06-30

1991-03-26

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit automatically reconnected only after the fault is...

361 96, H02H 308

Patent

active

050034260

ABSTRACT:
A faulted circuit indicator includes an inrush restraint circuit that suppresses a trip signal when an inrush current rises from below a minimum value to a trip value within a predetermined time and then drops again to another value such as the trip value. According to various aspects the restraint ends after a fixed time or after a variable time. According to another aspect a second trip circuit overrides the inrush restraint circuit when the current rises a given amount beyond the first trip value.

REFERENCES:
patent: 3715742 (1988-03-01), Schweitzer, Jr.
patent: 4733321 (1973-02-01), Lindeperg

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