一起220 kV变压器匝间短路故障诊断与分析

Diagnosis and Analysis of An Inter-urn Short-ircuit Fault for 220 kV Transformer

摘要:

文中对一起220 kV变压器匝间短路故障进行分析，从保护动作、诊断试验以及解体检查3个维度，对变压器典型匝间短路的故障特征及诊断过程进行介绍。纵联差动和增量差动保护提示A相绕组存在匝间或高阻接地故障；低电压空载和绕组变形试验表明A相存在匝间短路或磁路故障；变比测试提示高压绕组存在匝间短路。解体检查发现A相高压绕组确实存在匝间短路故障，验证了所诊断分析的结论。

Abstract:

An inter-urn short-ircuit fault of 220 kV transformer is analyzed, and the fault characteristics and diagnosis process of typical inter-urn short-ircuit of transformer are introduced in detail from protection action, diagnostic test and disassembly inspection. The longitudinal differential protection and incremental differential protection point out that winding in phase A has inter-urn or high resistance grounding fault. The low-oltage no-oad and winding deformation tests show that phase A has inter-urn short-ircuit fault or magnetic circuit fault, and the transformation ratio test indicates that the high-oltage winding has inter-urn short-ircuit. During the disassembly inspection, it is found that high-oltage winding in phase A has inter-urn short-ircuit fault, which verifies the diagnosis and analysis conclusion.