有载分接开关油箱渗漏导致变压器油色谱数据异常诊断

变压器油色谱分析结果可直接反映变压器存在故障与否。针对某台220 kV主变压器（主变）油色谱分析乙炔超标问题,对该主变进行故障诊断,采用几种带电检测手段对该台变压器进行分析,均未表现任何放电或过热缺陷;后通过改变变压器有载分接开关运行状态,初步确定变压器油乙炔超标的原因为有载分接开关油箱与本体油箱存在渗漏点,停运后的现场检查结果验证了这一推断。为解释故障特征气体来源,介绍了有载分接开关的动作机理和切换过程,为今后变压器本体油色谱分析结果超标问题的分析提供了新的思路和经验。

Diagnosis and Treatment of Abnormal Chromatographic Transformer Oil Caused by On-Load Tap Changer Oil Leakage

The transformer oil chromatogram can directly reflect whether there exists any fault in the power transformer. Aiming at the problem of abnormal C₂H₂ 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.