800 kV投切交流滤波器用断路器研制

Development of Circuit Breaker for Switch 800 kV AC Filter

特高压直流换流站投切滤波器用断路器对产品的容性开断能力提出了更加严苛的要求,现有800 kV断路器无法满足要求,需开发投切滤波器专用断路器。分析了交流滤波器用断路器的技术难点,从限制合闸涌流、提升弧触头烧蚀性能、绝缘气体压力提升和电场强度分析等方面阐述了断路器研制方案。研制的断路器先后进行了5轮C2级试验和FC2试验,未发生一次重击穿,体现了良好的容性开断能力。产品应用于青海—河南±800 kV特高压直流输电工程,有效地支撑了电网的可靠运行。

Circuit breakers for switching filters in UHV DC converter stations put forward more stringent requirements on the capacitive breaking capacity of products.The existing 800 kV circuit breakers cannot meet the requirements,and special circuit breakers for switching filters need to be developed.In this paper the technical difficulties of AC breakers are analyzed,and the circuit breaker development scheme is expounded from the aspects of limiting the inrush current,improving the ablation performance of the arc contact,increasing the pressure of the insulating gas and analysis the electric field structure.The developed circuit breaker has undergone 5 times of C2 level test and FC2 test,and no restrike has occurred,it showed good capacitive breaking capability.The product is applied to Qinghai-Henan±800 kV UHV DC transmission project,effectively supporting the reliable operation of the power grid.