一起有载切换开关故障引起的 110 kV变压器运行事故原因分析

Analysis of a 110 kV Transformer Operation Accident Caused by Failure of On － load Tap Changer

摘要:

基于一起 110 kV 变压器的有载切换开关故障，对其进行油色谱分析、短路阻抗、绕组变形、绕组直流电阻和有 载分接开关切换时间和动作顺序试验，结合吊罩检查，分析出了事故原因及过程，并且针对事故提出了预防性措施。

Abstract:

The switching process of on － load tap changer ( OLTC) is introduced． The oil color spectrum analysis，short － circuit impedance，winding deformation，winding DC resistance and the switching time and action sequence of on － load tap changer are tested based on the fault of on － load tap changer of a 110 kV transformer． The cause and process of the accident are analyzed according to those test results combined with the inspection of hanging cover，and a new preventive detection method and new organizational measures are given for the accident．