In this paper

the treatment process of abnormal secondary voltage due to breakdown of element of CVT dividing capacitor is introduced

the fault position is preliminarily judged by live detection measures such as infrared temperature measurement and insulating oil test

and the reason of such fault is analyzed combining with testing disconnect from the high voltage line and disassembling inspection. Finally

corresponding improvement measures of the fault are given. It is shown by the treatment of the fault that infrared temperature measurement and insulation oil test are a simple live testing methods

which can find out the defect in equipment at early stage and provide important evidence for condition evaluation of equipment.