短路電流非周期分量及其在繼電保護中的應(yīng)用
馮建勤,黃思芳,宋海龍
鄭州輕工業(yè)學(xué)院 電氣信息工程學(xué)院,河南 鄭州 450002
摘 要:為準(zhǔn)確判斷電力系統(tǒng)短路故障,提出了一種利用短路電流中的非周期分量作為短路故障的判據(jù)。通過相量分析和仿真分析,研究了短路電流中的非周期分量。利用Matlab仿真軟件提取短路電流中的非周期分量,得出了短路電流中非周期分量的特點。利用這些特點將非周期分量法運用到繼電保護中去,既可單獨作為線路的主保護,也可與其它保護相結(jié)合,運行結(jié)果表明,運用此法可準(zhǔn)確判斷電力系統(tǒng)短路故障。
關(guān)鍵詞:短路電流;非周期分量;光電流互感器;繼電保護
中圖分類號:TM771 文獻標(biāo)識碼:B 文章編號:1007-3175(2014)12-0035-04
Short-Circuit Current Aperiodic Components and Their Application in Relay Protection
FENG Jian-qin, HUANG Si-fang, SONG Hai-long
College of Electric and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
Abstract:In order to accurately determine the short-circuit fault in power system, this paper proposed to use the aperiodic components in short-circuit current as a criterion in short-circuit faults and studied the aperiodic components in short-circuit current by phasor and simulation analysis. The aperiodic components in short-circuit current were simulated and extracted in Matlab to obtain the characteristics of the aperiodic components in the short-circuit current, so that the aperiodic components method was applied in the relay protection, either as a primary protection circuit alone, or as the combination with other protection circuit. The results show that this method can accurately judge the short-circuit faults of the power system.
Key words:short-circuit current; aperiodic components; optical current transducer; relay protection
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