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Abstract:
After analyzing the distribution rule of zero-sequence current on NES (neutral earthing via arc extinguishing coil system), two new methods for fault section locating are proposed. One method is based on section zero-sequence current ratio; the other method is based on parallel medium resistance. The former method uses the ratio of two sections zero-sequence current RMS after fault occurring as its criterion, and the latter method uses the changes of section zero-sequence current which is rectified to the same zero-sequence voltage before and after fault occurring as its criterion. Because of existing fault section locating blind zones and misjudgements when using single criterion, this paper constructs membership functions and weight functions for two methods based on fuzzy theory, and uses weighting factor method to realize the fusion of two methods. Results of extensive simulation to different line forms, different fault resistances and different fault positions show the effectiveness of the method which is simple and without blind zones.
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Power System Protection and Control
ISSN: 1674-3415
CN: 41-1401/TM
Year: 2012
Issue: 10
Volume: 40
Page: 65-70
Cited Count:
SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
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