Busbar differential protection method
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United States of America Patent
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Jul 8, 2014
Grant Date -
Oct 3, 2013
app pub date -
Oct 15, 2012
filing date -
Apr 1, 2012
priority date (Note) -
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Abstract
The present invention relates to a busbar differential protection method. For each bay, firstly, zero-crossing point of voltage is determined according to sample values of voltage, then the current values are re-sampled on a current fitting curve by using zero-crossing point of voltage as a synchronous signal according to a given sampling time period to get a sample sequence. The sample sequence is comprised of current values of sampling points and sample serial numbers. The sample serial numbers of sampling points at the same time are same for the sample sequence of respective interval. Finally, computing is done to sample sequences of respective intervals, and differential protection is achieved.
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