Ground fault detector

Details Ground fault detector Ground fault detector

1979-04-03

1980-11-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324 51, 340651, 361]H02H326, H02H 326

Patent

active

042349001

ABSTRACT:
A sensed current resulting from the occurrence of a ground fault is amplified by a differential amplifier and applied to a waveform shaper after having been delayed. The waveform shaper includes two complementary transistors interconnected into a thyristor and a transistor for amplifying the delayed current from the thyristor to a constant current under the control of a negative feedback transistor. The constant current is applied to a thyristor to turn it on to activate an associated circuit interrupter.

REFERENCES:
patent: 3953766 (1976-04-01), Howell et al.
patent: 4037155 (1977-07-01), Ahmed
patent: 4150411 (1979-04-01), Howell
"LM 1850 Ground Fault Interrupter" National Semiconductor Company 1978.
"MC 3426 Ground Fault Interrupter Subsystem" Motorola Semiconductor Products Incorporated 1976.

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