Double grounded neutral fault detection

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United States of America Patent

PATENT NO 11563317
SERIAL NO

17476818

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Abstract

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A detector is provided that generates a leakage signal corresponding to a current imbalance between a line conductor and a neutral conductor for a load, and selectively injects a test signal into the neutral conductor. A frequency of the test signal substantially corresponds to a utility frequency. The detector measures a first value of the leakage signal, determines if the first value is less than first threshold value, and begins injection of the test signal into the neutral conductor in response to determining that the that first value is less than the first threshold value. In response to injecting the test signal, the detector measures a second value of the signal, determines if the second value is greater than a second threshold value, and disconnects the line conductor from the load in response to determining that the second value is greater than the second threshold value.

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Patent Owner(s)

  • ABB SCHWEIZ AG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
McPhee, Lucas J Unionville, US 2 2
Nagawaram, Chandrashekar Hyderabad, IN 4 15

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