一例干式变压器匝间短路故障分析  

Analysis of an Inter-turn Short-Circuit Fault of Dry-type Transformer

作　　者：周平[1] 叶华松[1] 吴礼贵[1] ZHOU Ping;YE Huasong;WU Ligui(China Yangtze Power Co., Ltd., Yichang 443133, China)

机构地区：[1]中国长江电力股份有限公司,湖北宜昌443133

出　　处：《水电与新能源》2020年第1期72-75,共4页Hydropower and New Energy

摘　　要：在一例干式变压器损坏故障分析过程中,高压侧故障电流为两相对称反向电流。经对变压器高压侧电压电流波形的分析,结合变压器吊心检查,排除了变压器低压侧存在单相接地故障的可能性。通过Simulink对高压侧小匝间短路故障进行仿真,得到了与故障电流电压波形相吻合的结果。变压器高压绕组的解体结果,确认了匝间短路故障的存在,验证了仿真分析结合变压器解体方法在变压器匝间短路分析中的有效性,为变压器匝间短路分析提供了一种分析方法。An inter-turn short-circuit fault of dry-type transformer is analyzed.It is found that the fault current at the high voltage side is two-phase symmetric reserves current.With an analysis of the voltage and current fault waveforms at the high voltage side,and the core hanging-out inspection,we exclude the possibility of the single-phase grounding fault at the low voltage side.Then,Simulink toolkit is adopted to simulate the inter-turn short-circuit fault at the high voltage side.The results are consistent with the recorded fault current and voltage waveforms.Disassembly inspection of the high voltage windings confirms the existence of the inter-turn short-circuit.It shows that the combination of the simulation method and the disassembly inspection can effectively determine the inter-turn short-circuit fault of transformers.

关 键 词：干式变压器 匝间短路 故障录波 仿真 

分 类 号：TM41[电气工程—电器]