变压器空载电流非线性变化原因研究  

Research on Causes of Nonlinear Variation of No-load Current in Transformer

作　　者：罗明才 马进 刘磊 徐会凯 LUO Mingcai;MA Jin;LIU Lei;XU Huikai(State Grid Zigong Electric Power Supply Company,Zigong 643000,Sichuan,China;State GridGuangyuan Electric Power Supply Company,Guangyuan 628000,Sichuan,China;College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu 610059,Sichuan,China)

机构地区：[1]国网四川省电力公司自贡供电公司,四川自贡643000 [2]国网四川省电力公司广元供电公司,四川广元628000 [3]成都理工大学核技术与自动化工程学院,四川成都610059

出　　处：《四川电力技术》2023年第4期54-58,共5页Sichuan Electric Power Technology

摘　　要：变压器空载试验是诊断变压器铁芯故障的重要试验。文中通过对一台35 kV三相双绕组变压器空载试验以及在不同试验接线情况下空载试验数据的分析,研究了小容量高电压等级变压器空载试验时试验电压从0升高至规定试验电压过程中空载电流呈现先上升后下降再陡增的非线性变化现象。试验研究分析表明导致此类变压器出现该现象的主要原因是试验电压三相不平衡。变压器中性点接地时,零序电流是造成此现象的主要原因,而非传统文献认为的电容电流,研究结论对分析判断变压器空载电流变化具有参考意义。The no-load test of transformer is an important test for diagnosing core faults in transformers.Through the no-load test of a 35 kV three-phase double-winding transformer and the analysis of no-load test data under different test wiring conditions,the no-load test of a small-capacity high-voltage transformer is studied to show a non-linear variation in no-load current from zero to the specified test voltage during the no-load test,and the analysis of the test research shows that the main cause of this phenomenon in such transformers is the three-phase unbalance of test voltage.When the neutral point of transformer is grounded,the zero-sequence current is the main cause of this phenomenon,rather than the capacitance current considered by the traditional literature.The research results are of reference significance for the analysis of no-load current change in transformers.

关 键 词：变压器 空载电流 非线性变化 零序电流 

分 类 号：TM406[电气工程—电器]