Loss of neutral or ground protection circuit

Details Loss of neutral or ground protection circuit Loss of neutral or ground protection circuit

1989-04-19

1990-06-05

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 50, 340649, 340652, H02H 316

Patent

active

049318934

ABSTRACT:
A loss of neutral or ground protection circuit is disclosed which uses a simple capacitive circuit which discharges through the neutral or ground leads in normal conditions, and in the event of loss of neutral or ground charges sufficiently to trip a circuit breaker. The protection circuit may include other circuits such as ground fault detection circuits and may be in a one or three phase system. By virtue of the fact that a capacitive circuit is used to trip the circuit breaker, an inherent time delay is involved and thus the circuit breaker will not be tripped as a result of a momentary loss of neutral or ground. This is particularly important where continuity of operation of a load is important.

REFERENCES:
patent: 3922659 (1975-11-01), Dighe
patent: 3973171 (1976-08-01), Howell
patent: 3987341 (1976-10-01), Clark
patent: 4011483 (1977-03-01), Meadows
patent: 4598331 (1986-07-01), Legatti

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