Enhanced AC immunity in ground fault detection

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

2008-09-29

2010-10-26

Mehmood, Jennifer (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C324S522000, C324S525000, C361S042000, C361S091200

Reexamination Certificate

active

07821413

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.

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