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A kind of main/auxiliary type wide-area backup protection fault location algorithm is proposed to improve the performance of the protection system. The “main” is through strict mathematical calculation to accurately locate the fault location, and the “auxiliary” is using the basic knowledge of power system to predict the fault interval. The “main” and the “auxiliary” run simultaneously. The interval...
This paper presents a novel technique for distinguishing between transformer inrush currents and internal fault currents. On the basis of basic morphological transforms and their combined modes, transient current signals can be extracted meanwhile a variety of noises can be greatly suppressed by use of the novel morphological gradient (NMG) with adaptive weighting. Based on different characteristics...
The reflection and refraction of fault-generated wave is discussed. The equations of currents measured by relay in S domain are deduced applying the Peterson principle. The energy ratio of a high frequency component to a low frequency component is mainly influenced by the fault position. Protection based on the ratio will be more adaptive if a higher frequency component is selected to be the low frequency...
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