Fault Analysis of Medium Voltage Bushing of 110kV Main Transformer Based on Infrared Accurate Temperature Measurement and Oil Chromatographic Analysis

The health condition of main transformer bushing is related to the safe operation of power grid. With the application of live monitoring technology, many defects such as heating of the bushing cap have been found through infrared temperature measurement. In this paper, a defect of middle voltage bushing of 110kV main transformer has been introduced. Firstly, through the long-term tracking of infrared measurement and oil chromatography analysis of the joint monitoring technology, it was found that the bushing body was hot. After power failure test and disintegration inspection, it was found that there were two obvious burning marks on the conductive rod in the bushing and the insulation resistance of the winding was not qualified, which verified the accuracy of the joint monitoring technology.