Enhanced AC immunity in ground fault detection
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United States of America Patent
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Oct 26, 2010
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app pub date -
Sep 29, 2008
filing date -
Mar 16, 2006
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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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