Ground fault detector

Details Ground fault detector Ground fault detector

1975-11-05

1977-01-04

Moose, Harry

317 38, H02H 330

Patent

active

040016480

ABSTRACT:
A zero phase-sequence current transformer responds to a ground fault occurring in a distribution line to produce an output. With the ground-fault current low, the output increases gradually a charged voltage across a capacitor to a predetermined magnitude through a high resistor. At that time a thyristor is turned on by a constant voltage element to open the associated circuit breaker. With the ground-fault current high, the output from the transformer breaks down a Zener diode to immediately charge the capacitor to turn the thyristor on, resulting in the opening of the circuit interrupter.

REFERENCES:
patent: 3105920 (1963-10-01), Dewey
patent: 3132287 (1964-05-01), Yarbrough
patent: 3733517 (1973-05-01), Wilson
patent: 3809962 (1974-05-01), Brown et al.

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