基于基波信号的输电线路数字保护方案.pdf

维普资讯 No2 电力科学与工程 2006 EI．ECTRICP0WER SCIENCE AND ENGINEERING ·55 文章编号：1672—0792(2006)02—0055—04 DigitalProtectionSchemeforTransmission LineBasedonFundamentalSignals AshrafMohamed (NorthChinaElectricPowerUniversity。Baoding071003。China) 基于基波信号的输电线路数字保护方案 阿沙夫 ·默哈默德 (华北电力大学 电气工程学院，河北 保定071003) 摘要：电力系统规模的不断扩大和越来越复杂，提出了快 talfilteringtechniques．Inthecaes ofstaticrelaysor 速动作和高可靠性保护方案的要求。文章提出了采用合理 electromechanicalrelays，thetransientsraeeliminated 的数字滤波器从暂态信号中提取电压和电流基波分量的保 bytheues ofreplicaimpedance． 护方案。该方法适用于EHV／UI-W 输电线路保护和故障定 Hence in the caes ofdigitaldistancerelaying 位 。 scheme，thelinecurrentsareocntinuouslymonitored 关键词 ：数字保护；输电线路；基波；微机保护 throughCT andbusvoltages throughPT．Sincethe Abstract：Thecontinuousgrowthinthesizeandocmplexityof elcetricpowersystemshasgivenrisetotheneedforextremely impedancetothepo intofthefaultistheratiooffun— fastnadhighlyreliableprotcetionschme e．In thecshme epro— damentalcompo nentofvoltageandcurrent，itisnee— posedinthepaper，theaim istoextractthefundamentalpower essarytoeliminatethetransientcomponentsinvolt— frequencyocmponentsofvoltagenadcurrentsignalsfrom the ageandcurrentwhichappearaftertheoccurrenceofa ocmplexl：K~t—faultwaveofrmsbyusingsuitablefilters．