Ground fault detector circuit with high current inhibit

Details Ground fault detector circuit with high current inhibit Ground fault detector circuit with high current inhibit

1975-02-10

1976-07-06

Miller, J D

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

317 13A, 317 35, 317 36TD, 307235N, H02H 7085

Patent

active

039684091

ABSTRACT:
A current transformer couples to the power lines leading to a motor starter and it generates a current proportional to the current which flows as a result of ground faults. When the ground fault current reaches a first level, the circuit is tripped and a circuit breaker deenergizes the motor starter. When the ground fault current reaches a second, much higher, level the circuit is inhibited from operating to allow circuit interrupting devices in the motor starter to interrupt the circuit to the motor.

REFERENCES:
patent: 1684249 (1928-09-01), Stevenson, Jr.
patent: 1919895 (1933-07-01), Luthi
patent: 3155879 (1964-11-01), Casey et al.
patent: 3558978 (1971-01-01), Nye et al.
patent: 3579038 (1971-05-01), Backderf et al.

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