基于油色谱分析的变压器有载开关油渗漏缺陷诊断方法创新研究

A Novel Diagnostic Method for Oil Leakage from On-load Tap-changer of Transformer Based on Oil Chromatographic Analysis

变压器有载开关油渗漏导致变压器本体油中乙炔含量增长、超过注意值的现象时有发生,对判断设备缺陷带来困扰。国标中提出的C2H2/H2>2法,由于正常运行状态下变压器油中氢气浓度相比乙炔浓度要高,该判断方法适用范围受到限制。通过分析有载开关油中各气体组分特征,提出了比值法、曲线法、特征气体法和运行方式法等判断方法用于诊断有载开关油渗漏现象,并举例分析,结果表明比值法等方法对诊断变压器有载开关油渗漏具有较高的准确性。

The oil leakage from on - load tap - changer （OLTC） of transformer occasionally occurs that causes the increment of acetylene content in the oil of transformer body over the alert value, resulting in a difficult position for determination of equipment defects. A method of C2H2/H2 〉 2 is put forward by the Chinese GB standard, however, the applicable scope of the method is often restricted since the concentration of hydrogen is comparably higher than that of acetylene in the transformer oil. Those methods for diagnosis of the oil leakage from on -load tap -changer, such as ratio method, curved method, characteristic gases method and operation mode method are presented by analyzing the characteristics of various components of gases in on - load tap - changer oil. And with the analysis by examples, the results prove that the higher accuracy may be obtained for the diagnosis of the oil leakage from on - load tap - changer of transformer with the ratio method etc.