Example analysis and preventive proposal of 110kV transformer short circuit fault

A typical case of short-circuit fault of 110kV main transformer is introduced, and the equipment inspection, diagnostic test results and suspension hood disassembly are analyzed. The initial cause and development process of transformer under short-circuit current impact, as well as the vibration and arc ablation morphology of winding under electrodynamic action are sorted out, and the short-circuit damage causes of transformer are identified. According to the operation status of the main transformer in Hunan Power grid and the protection action characteristics of the distribution network, some suggestions and measures are put forward from the perspective of equipment operation management.