resonance±11.2kV直流融冰装置换流变低压侧电压互感器中性点接地问题探讨

Discussion on Neutral Grounding of Converter Transformer on Low Voltage Side of±11.2 kV DC Deicer

直流融冰装置在进行融冰时,可能出现换流变低压侧电压互感器熔丝熔断、电压互感器爆炸的问题。分析了该事故产生的机理及抑制措施,并提出了一种解决融冰过程中谐振问题的办法。

When the DC ice melting device is melting ice,the fuse of the voltage transformer on the low-voltage side of the converter transformer may be blown and the voltage transformer may explode.The mechanism and restraining measures of the accident are analyzed,and the physical simulation results are given.A solution is proposed to solve the resonance problem in the ice melting process:the primary side coil of the low-voltage side voltage transformer of the converter transformer is changed to a neutral point non-grounding method.