Analysis of a 220kV current transformer deflagration accident

A 220kV bus bypass current transformer fault caused bus differential protection action, which eventually caused the main transformer trip. The correctness of protection action is verified by analyzing the accident site, protection action and current transformer disassembly, the causes and process of the accident are analyzed accurately, and the corresponding rectification measures are formulated, which provides the basis for the operation and maintenance of the same type of equipment in operation, effectively prevent the occurrence of similar accidents and ensure the safe and stable operation of power grid.