Diagnostic Analysis and Disintegrate Verified on the Defect of 220kV Transformer Winding Deformation

This article describes the deformation defect on the low voltage winding of 220kV transformer found by diagnostic routine tests, which provide the field data for the study of transformer cumulative effects and faulty detection. Combination of the test results of the oil Chromatography after impact by short circuits over the years, analyzed deformation reasons, that mainly due to the low pressure side of the short-circuit current impact and cumulative effect of winding deformation. Though the disintegration by depot, the low-voltage winding exists different degrees of deformation and overheating. This article describes the diagnostic through the transformer winding deformation; effectively prevents latent failures of devices happening, and given the recommendations of routine maintenance and overhaul on transformer.