站用变压器事故仿真分析与建议

针对一起500 kV变电站站用变压器事故进行分析。根据故障录波数据初步判断事故起因,通过RTDS仿真与理论推导相结合的方式,证实事故原因是主变压器低压侧的无功补偿电容器和站用变压器在短时间内同时运行的工况下产生了串联谐振,谐振引起站用变压器铁心激磁,导致变压器内部损坏,站用变压器瓦斯保护动作。提出相应的防范和处理措施,对今后避免类似事故的发生提供有利的借鉴。

Simulation Analysis and Suggestions on Station Transformer Accident

A station transformer accident in 500 kV substation is analyzed. The reason of the accident is preliminarily judged based on fault recording data,then by the combination of RTDS simulation and theoretical derivation,it is confirmed that the reason of the accident is the series resonance generated by the short time simultaneous operation of the reactive compensation capacitor and the station transformer at the low voltage side of main transformer,which caused the iron core excitation of the station transformer,and lead to the internal damage of the transformer and the action of gas protection. Prevention and treatment measures are proposed which provide useful reference to avoid similar accident in future.