Earth leakage protective relay

Details Earth leakage protective relay Earth leakage protective relay

1998-08-10

2000-02-15

Jackson, Stephen W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 18, 361 23, 361115, H02H 300

Patent

active

060259809

ABSTRACT:
An earth fault detection circuit employs a differential current transformer and burden resistor to sample circuit current for potential earth fault current. A second order low pass filter circuit is employed to filter out harmonics within the protected circuit and a time delay circuit is used to insure the occurrence of a true earth fault leakage condition. A circuit with an operational amplifier is used to create a symmetric power supply for the rest of the circuits from a full wave rectified AC source.

REFERENCES:
patent: 4417202 (1983-11-01), Pascoe
patent: 5245498 (1993-09-01), Uchida

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