Portable ground fault protector
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United States of America Patent
Stats
-
Aug 5, 1980
Grant Date -
N/A
app pub date -
Oct 26, 1978
filing date -
Oct 26, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the absence of a ground fault, a triac completes an AC energization circuit for a relay whose contacts then close to provide load circuit continuity. Gate drive for the first triac is obtained from a secondary winding of a transformer whose primary is driven by an oscillator for the purpose of producing a differential transformer unbalancing current signal in the event of a desensitizing ground fault on the load circuit neutral conductor. When the differential transformer senses a ground fault, the oscillator is disabled, and the resulting loss of gate drive renders the triac non-conductive to drop out the relay.
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