变压器铁心多点接地故障及其诊断

Multi-point Ground-fault of Transformer Core and Its diagnosis

当变压器铁心出现多点接地时会严重威胁变压器的安全运行。正常运行的变压器只能一点接地,所以在变压器大修或检修试验时,要对变压器铁心接地引出线做绝缘电阻测试,若绝缘电阻过低或为零,即说明铁心发生了多点接地。准确、及时诊断变压器铁心多点接地故障,对于系统的安全、稳定运行具有十分重大的意义。

When the transformer core experienced multi-point ground, that would seriously threaten the safe operation of the transformer. Normal operation of the transformer can only point to earth, so in the transformer repair or maintenance test, do the insulation resistance testing for the ground lead wire of the transformer, if insulation resistance is too low or zero, which shows the occurrence of multi-point grounding. Accurate and timely diagnosis of transformer core multi-point grounding fault has great significance for safe and stable operation of system.