一起550kV油浸纸变压器套管工频闪络原因分析

Investigation on AC Flashover of a 550 kV Oil Impregnated Paper Transformer Bushing

对一起550 kV变压器套管的工频闪络原因进行了分析,建立了套管和试验油缸的全尺寸有限元模型并对模型进行了有限元仿真,分析了小套管外壁有无气泡对套管内部电场分布的影响。最后提出试验前应将套管充分静置等防止此类事故的建议,对实际试验具有一定的指导意义。

This paper analyses a typical AC flashover of 550 kV oil impregnated paper transformer bushing.The finite element model of the bushing and oil tank has been built and investigated according to the actual size.Moreover,the electrical field influence of small bubbles on the bushing casing has also been studied.Finally,practical suggestion has been proposed in order to prevent such similar failure.