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《Automation of Electric Power Systems》 2014-24
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Faulty Feeder Identification Based on Combined Transient and Power-frequency Components in Resonant Grounded Systems

XUE Yongduan;ZHANG Qiufeng;YAN Tingchun;XU Bingyin;College of Information and Control Engineering,China University of Petroleum (East China);Shandong Kehui Power Automation Co.Ltd.;Research Center for Smart Grid,Shandong University of Technology;  
The power-frequency component is no longer suitable for faulty feeder identification in a resonant grounded system.Influenced by the incorrect polarity connection of voltage transformer and current transformer,faulty feeder is apt to result using feeder identification based on transient current polarity or transient reactive power direction comparison.The distribution differences between transient and power-frequency current as well as transient and power-frequency reactive power for singlephase earth fault in the compensated system are analyzed,based on which,two faulty feeder identification methods based on combined transient and power frequency components are proposed.A faulty feeder is one with a polarity different from that of both the transient zero sequence current and power frequency zero sequence current of healthful feeders,or,a feeder is identified as a faulty one if its transient reactive power and power-frequency reactive power have different directions.The proposed methods have fairly good faulty feeder identification reliability for their ability of avoiding incorrect polarity connection of voltage transformer and current transformer.The feasibility of the new methods is verified by both digital simulation and field test data.
【Fund】: 国家自然科学基金资助项目(51077090 51477184);; 国家高技术研究发展计划(863计划)资助项目(2012AA050213);; 国家电网公司科技项目(JS031〔2012〕19)~~
【CateGory Index】: TM862
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