基于数值仿真计算的220kV线路避雷器相间干扰研究-Open.PDFVIP

基于数值仿真计算的220kV线路避雷器 相间干扰研究 李凌燕，杜志叶，阮江军，李金亮 （武汉大学电气工程学院，湖北武汉，430072） 摘要：氧化锌避雷器（MOA）在线监测中经常由于相间耦合干扰的影响而难以实现阻性电流的准确测试。本文研究了不同 相序布置下的220kV线路避雷器，通过精确的三维建模和有限元数值计算得到各部分电容值，再在EMTP-ATP 中建立测量 环境对应的阻容网络，计算不考虑相间干扰和考虑相间干扰时各相避雷器的全电流、相角差和阻性电流，从而有效滤除相间 干扰，提高阻性电流监测的准确度。对比分析表明，220kV线路避雷器相间干扰对阻性电流的影响情况与避雷器的相序布置 方式有关，且三相布置的不对称性会导致相间干扰影响的不稳定性。 关键词：220kV线路避雷器；阻性电流；有限元法；阻容网络；相间干扰 中图分类号： TM862 ResearchonInterphaseInterferenceof220kVLineMOABasedon NumericalSimulationandCalculation LILing-yan，DUZhi-ye，RUANJiang-jun，LIJin-liang （SchoolofElectricalEngineering,WuhanUniversity,Wuhan430072,China） Abstract During the on-site live measurement of MOA, it’s difficult to measure the resistive current accurately because of the interphaseinterference.Inthispaper,three-phaseMOAona220kVtransmissionlineindifferentphase sequenceisresearchedabout theinterphaseinterference.Theself-capacitanceandmutualcapacitanceofthearresterisobtainedbyestablishingandcalculatingan elaborate 3dmodelbased onthe finite elementmethod,thevalues ofwhich are substitutedintotheresistance-capacitancenetwork establishedinEMTP-ATPtoperform simulationandcalculation.Thenthetotalcurrent、resistivecurrentandphase angledifference eitherwithorwithouttheinterphaseinterferencecanbeobtained.Throughcomparisontheinterphaseinterferencecanbeeffectively filtered,thus improvingthe accuracy ofresistive currentmonitoring. Comparative analysis showsthat the interphase interference’s effect on resistive current is related to the phase sequence of arrester, also asymmetry of three-phase arrangement can result in instabilityofinterphaseinterference. Keywords 220kVlineMOA；resistivecurrent；finiteelementmethod；resistance-capacitancenetwork；interphase interference 要准确测得泄漏电流阻性分量，就必须准确测 0 引言