以油中溶解气体分析为特征量诊断电力变压器故障部位的探讨

Discussion on Fault Position Diagnosis for Power Transformer Using Dissolved Gas Analysis in Oil as Characteristic Quantity

用油中溶解气体分析(DGA)能灵敏地发现电力变压器潜伏性故障的性质。然而,对于采用DGA来诊断电力变压器故障部位的方法,目前仍存在能与不能两种观点。笔者经过10年的探索,结合实际故障,运用多种诊断方法(如改良三比值法、四比值法、特征气体法、灰色聚类法等)联合诊断,再经正反向混合推理,可以得出最可能的电力变压器故障部位,有效提高了诊断准确性,这对实际生产具有一定的现实意义。

To use dissolved gas analysis (DGA) in oil can discover the nature of hidden fault sensitively in power transformer. However, there are two different viewpoints for DGA method to diagnose power transformer fault position. Through the exploration and combination with actual faults in 10 years, various diagnosis methods (such as 3 ratios, 4 ratios, characteristic gas and gray assembly) were adopted and diagnosed jointly, which can reach the most possible power transformer fault position and raise the diagnosis accuracy efficiently.