Self testing circuit breaker ground fault and sputtering arc tri

Details Self testing circuit breaker ground fault and sputtering arc tri Self testing circuit breaker ground fault and sputtering arc tri

1993-09-15

1995-10-17

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 49, 361113, 324520, H02H 316

Patent

active

054596300

ABSTRACT:
Ground fault trip units for circuit breakers are tested by a passive test circuit which includes a test conductor passing through the current transformer sensing coil(s), and a test switch which selectively connects the test conductor in a loop which simulates a neutral-to-ground fault. In a dormant oscillator ground fault test circuit, the test conductor loop passes through both sensing coils. When the neutral-to-ground detector is combined with a sputtering are fault detector sharing a common sensing coil, testing of all the components is accomplished by adding an additional test circuit which injects pulses derived from the line conductor into the sensing coil secondary, or which alternatively, connects a capacitor charged from a DC supply across the sensing coil secondary. Either of these alternative test circuits generates the successive events needed to produce a sputtering arc trip.

REFERENCES:
patent: 4618907 (1986-10-01), Leopold
patent: 4833564 (1989-05-01), Pardue et al.
patent: 5177657 (1993-01-01), Baer et al.
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5307230 (1994-04-01), MacKenzie

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