METHOD AND SYSTEM FOR IDENTIFYING LIGHTNING FAULT AND THE TYPE THEREOF IN THE OVERHEAD TRANSMISSION LINE
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United States of America Patent
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Issued Date -
Jun 30, 2016
app pub date -
Mar 16, 2015
filing date -
Dec 24, 2014
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Abstract
A method for identifying a lightning fault of an overhead transmission line (OTL) comprising determining a polarity of a travelling wave of each of three ABC phases subsequent to a single phase outage of the OTL. If the polarity of each phase is the same, the outage is a lightning fault and its type a back flashover; if not the same, proceed to the second step to determine a current change rate R of the fault phase. If R is larger than a threshold value, the outage is a lightning fault and its type a shielding failure; otherwise, the outage is a single-phase grounding fault. A system for identifying the lightning fault which comprises successively at least a group of fault detectors, a wireless communication module, a remote monitoring master station which adopts the above method to determine the fault type of the overhead transmission line.
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