Ground fault detector

Details Ground fault detector Ground fault detector

1976-05-20

1977-04-26

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 87, 361142, H02H 328

Patent

active

040203948

ABSTRACT:
A ground fault detector for protecting an electrical power system against ground leakage currents. The detector is of the differential transformer type, in which the primary windings of the transformer are connected in series with the hot and neutral lines of the power system, any unbalance in the currents flowing through these lines being detected by sensing the unbalance voltage induced in the secondary winding of the transformer. The secondary voltage is amplified and employed to actuate a solenoid which trips the system circuit breaker in response to unbalance in line and neutral currents due to the flow of ground leakage current. A secondary winding on the solenoid is connected in the neutral line to cause the detector to operate in response to a neutral to ground fault, which might otherwise go undetected.

REFERENCES:
patent: 3202875 (1965-08-01), Bateman

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