一起330 kV电力变压器故障的分析及经验

Analysis and Experience of a Fault in a 330 kV Power Transformer

通过对一起330 kV、240 MV.A变压器故障过程的分析,表明局部放电的能量密度虽不大,但若进一步发展会导致设备的击穿或损坏。无励磁分接开关缺陷严重性有时难以通过色谱跟踪试验确定,直流电阻测试对于发现此类缺陷也有很大的局限性。同时提出了新的变压器故障的诊断方法。

Through the analysis of a fault in 330 kV, 240 MV·A transformer, it was shown that further development of partial discharge （PD） with even relatively smaller PD energy density will lead to breakdown or damage in equipment, off-circuit tap-changer defect tracking test was sometimes difficult to determine the chromatography, and DC resistance test is also limited for the detection of such defects. Therefore, a new transformer fault diagnosis method was proposed.