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《Electric Power》 2017-03
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Diagnosis and Treatment of Abnormal Chromatographic Transformer Oil Caused by On-Load Tap Changer Oil Leakage

LI Yuquan;KOU Xiaoshi;ZHENG Hanbo;ZHAO Lei;SHAO Yingbiao;WANG Wei;XIE Wei;ZHANG Zhen;QU Shaoping;State Grid Henan Electric Power Research Institute;State Grid Nanyang Power Supply Company;Henan EPRI Hitech Group Co.,Ltd.;  
The transformer oil chromatogram can directly reflect whether there exists any fault in the power transformer.Aiming at the problem of abnormal C_2H_2 in the 220-kV power transformer oil exposed from the chromatographic analysis,the fault diagnosis is carried out on the transformer.However,no sign of faults such as discharge and over-heating are observed through the live line testing.Then by altering the operation conditions of on-load tap changer,the cause is preliminarily determined as the leakage in the oil tanks of both the on-load tap changer and the transformer,which is later verified by the field inspection after equipment shutdown.To explain the source of the characteristic gas in the fault,the mechanism and switching procedures of the on-load tap changer are presented,which tends to provide a new way of thought and relevant experience on the analysis of such problems for the future.
【CateGory Index】: TM407
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