Analysis and Research on the Reasons for the Increase of Com ponents in 500kV Transformer Oil

This paper analyzes the cause of the defect of component growth in a 500kV transformer oil. First, the historical operation of the main transformer is analyzed, and then the oil chromatography data is studied. The A-phase online chromatography shows that the acetylene content is in good agreement with the offline chromatography detection, showing an increasing trend. The disintegration inspection of the main phase A phase found that there were two obvious discharge breakdown points in the inner paper tube of the low-voltage coil. According to the analysis results, the A-phase transformer should be managed and controlled, especially the oil chromatography tracking period (once every two weeks) should be shortened, and the load should be controlled if necessary.