特高压换流站变压器分接头动作逻辑及常见故障分析

Analysis on Operation Logic and Common Fault of Transformer Tap in UHV Converter Station

从控制方式、调档逻辑、电压控制、滑档保护等方面说明了特高压换流站中500 kV换流变压器、750 kV联络变压器、110 kV及66 kV站用变压器有栽调压机构的动作逻辑;结合实际案例,分析了与换流变压器励磁涌流相关的二次保护措施,针对档位不一致和分接头故障等情况提出了处理建议。最后在不进行技改的前提下,提出了运行维护相关建议。

The on load regulating mechanism action logic of 500 kV converter transformer,750 kV interconnecting transformer,110 kV and 66 kV station transformers in UHV converter station is explained from the aspects of control mode,shifting logic,voltage control and sliding protection.Combined with the practical cases,the secondary protection measures related to inrush current of converter transformer are analyzed,and some suggestions are put forward to deal with the situation of inconsistent gear position and tap joint failure.Finally,some suggestions on operation and maintenance are put forward without technical modification.