政平换流站最后断路器保护逻辑分析

Analysis of Protection Logistic for Last Breaker Trip in Zhengping Converter Station

针对政平换流站二期扩建后最后断路器保护可能发生误动问题,分析了电流闭锁判据失效的原因及各种负荷丢失情况下导致工频电压升高原因,依据阀的绝缘能力设定运行行为提出了解决措施,并根据现场实际给出了最终解决方案,有助于提高我国高压直流输电工程的设计、调试和运行水平。

This paper studies a possible fault trip of last breaker trip after the project extension of Zhengping converter station. The reason that the fail block of current criterion is pointed out and increasing magnitudes of line-frequency voltage are given when any load is rejected. The corresponding methods are put forward according to the insulation of valve and the final scheme is adopted in response to the field reality. This could be helpful in the process of design,debugging and operation of China domestic HVDC project.