500kV断路器机构控制回路双重化改造分析及应用

Analysis and Application for Double Transformation of 500 kV Circuit-Breaker Machine Control Circuit

鉴于500 kV断路器不能快速切除故障将存在直流换相失败的风险,二次系统必须满足"N-1"要求。阐述了某500 kV断路器机构控制回路的原理和不足,结合现场对其双重化改造进行分析,并提出了施工改造调试过程中的注意事项。建议在新投或者技改工程中,对断路器厂家严格要求其第一、二路分闸回路在电气方面的独立性,保障电网的安全稳定运行。

There exists the risk of DC commutation failure because a 500 kV circuit breaker is unable to eliminate fault fast, so the secondary system has to meet the ＂N-1＂ requirements. This paper expatiated on the principle and insufficiency of certain 500 kV circuit-breaker machine control circuit and combined with on-site condition to analyze and to discuss its double transformation in depth. The raised caution items in the process of construction transformation debugging provided references for fellow traders. This paper suggested that in the process of new bidding project or technique reforming project, the enterprise of circuit breakers should be strictly required to be independent of primary and secondary breaking circuits in electrical aspect, so as to ensure safe and stable operation of grid.