Enhanced AC immunity in ground fault detection

Details Enhanced AC immunity in ground fault detection Enhanced AC immunity in ground fault detection

2006-03-16

2008-10-28

Bugg, George A (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C324S522000, C324S525000, C361S042000, C361S091200

Reexamination Certificate

active

07443308

ABSTRACT:
A method for reducing the occurrence of false ground fault detections in a central office terminal is provided. The method includes generating a no-fault signal when no ground current is detected, delaying generation of a fault signal when ground current is detected at least for the duration of an expected pulse in AC induced signal, and when the ground current persists for a sufficient period, generating a signal indicating a fault condition.

REFERENCES:
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patent: 6002338 (1999-12-01), Pavlov et al.
patent: 6121886 (2000-09-01), Andersen
patent: 2006/0056118 (2006-03-01), Huczko et al.
patent: 2007/0085693 (2007-04-01), Feight

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