用于特高压直流的断路器开断小容性电流能力提升研究  

Research on Breaking Small Capacitive Current of Circuit Breaker Used in Ultra High Voltage Direct Current

作　　者：许猛 陈宇 高洋 沈丰慧 XU Meng;CHEN Yu;GAO Yang;SHEN Fenghui(Liaoning High Voltage Electrical Appliance Product Quality Testing Co.,Ltd.,Shenyang 110025,China;New Northeast Electric Group High Voltage Switchgear Co.,Ltd.,Shenyang 110025,China)

机构地区：[1]辽宁高压电器产品质量检测有限公司,辽宁沈阳110025 [2]新东北电气集团高压开关有限公司,辽宁沈阳110025

出　　处：《湖南电力》2023年第6期144-150,共7页Hunan Electric Power

摘　　要：为确保800 kV交流SF 6断路器开断特高压±800 kV和±1100 kV直流输电系统中滤波器组小容性电流的型式试验顺利通过,以及投运后产品的长期可靠运行,利用有限元法计算断路器不同条件下的电场强度和气体密度,得到原有断路器和三个优化方案的断路器介质强度及断路器分闸过程中介质强度最低点位置不受分闸速度和充气压力的影响的结论。结果表明,将现有断路器平均分闸速度提高5.7%,可以满足恢复电压峰值达到2100 kV的介质强度要求。试验顺利通过,开断过程无一次重击穿,证明采取的计算方法和优化方案有实际的指导意义。In order to ensure that the type test of breaking small capacitive current of 800 kV AC SF 6 ciruit breaker in UHVDC transmission system of±800 kV and±1100 kV is successfully passed and the products run reliably for a long time after being put into operation,the electric field strength and gas density of the circuit breaker under different conditions are calculated by finite element method,and it is concluded that the dielectric strength of the original circuit breaker and three optimized schemes and the position of the lowest point of dielectric strength during the circuit breaker opening process are not affected by the opening speed and inflation pressure.Under the optimized scheme,the average opening speed of the circuit breaker is increased by 5.7%,which can meet the dielectric strength requirement that the peak recovery voltage reaches 2100 kV.The test passed smoothly,and there was no re-breakdown in the breaking process,which proved that the calculation method and optimization scheme adopted had practical guiding significance.

关 键 词：断路器 容性电流 气体密度 电场强度 介质强度 

分 类 号：TM561.3[电气工程—电器]