Faulted circuit indicator

Details Faulted circuit indicator Faulted circuit indicator

1990-05-25

1992-12-01

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit automatically reconnected only after the fault is...

361 63, 361 92, 340652, G08B 2100

Patent

active

051684144

ABSTRACT:
Error-free, reliable registration of a fault in a power distribution circuit is achieved by a faulted circuit indicator that measures the current in the circuit after a discrete time delay following the detection of an overcurrent condition. A fault is registered only if the measured current is less than a prescribed level, evidencing that the overcurrent has operated a protection device (such as a fuse), upstream from the faulted circuit indicator, to interrupt the circuit and clear the fault. Hence, only actual (true) faults, resulting in circuit interruption and isolation of the fault, will be indicated, thereby precluding false registrations that may otherwise occur from non-faults such as transient currents, momentary overloads, inrush currents, and the like.

REFERENCES:
patent: 3922659 (1975-11-01), Dighe
patent: 4176350 (1979-11-01), Patterson
patent: 4616216 (1986-10-01), Meirow et al.
patent: 5010438 (1991-04-01), Brady

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