Earth leakage breaker

Details Earth leakage breaker Earth leakage breaker

1997-07-08

1999-01-05

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 57, H02H 300

Patent

active

058569022

ABSTRACT:
The earth leakage breaker of the invention includes a first comparator; a second comparator connected to the first comparator; a third comparator having a threshold higher than the threshold of the first comparator for distinguishing a leakage current from the grounding current caused by a lightning surge or by the heavy ground fault; a monostable multivibrator triggered by the output of the third comparator for forming a time gate of a predetermined period; a counter for detecting a pulse outputted from the first comparator to distinguish whether the grounding current is caused by the lightning surge or by the heavy ground fault; and a trip signal generator circuit for outputting a trip signal in the case of leakage and heavy ground fault. The earth leakage breaker facilitates avoiding unnecessary breaking of the impulsive grounding current caused by the lightning surge.

REFERENCES:
patent: 5600523 (1997-02-01), Park

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