基于冲击发电机系统的中压断路器背对背电容器组开合试验技术  

Back-to-back Capacitor Bank Switching Test Technology for Medium Voltage Circuit Breakers Based on Impulse Generator System

作　　者：纪明嵩 李涛 王磊 乔记山 JI Mingsong;LI Tao;WANG Lei;QIAO Jishan(Xi’an High Voltage Apparatus Research Institute,Xi’an 710077,China)

机构地区：[1]西安高压电器研究院股份有限公司,西安710077

出　　处：《高压电器》2024年第8期252-258,共7页High Voltage Apparatus

摘　　要：背对背电容器组开合试验用于考核断路器开合电容器组的重击穿概率,是重要的型式试验项目。针对关合涌流峰值I_(bi)和涌流频率f_(bi)在试验过程中难以准确调控,文中在分析国家标准对试验回路要求的基础上,提出以冲击发电机为试验电源的背对背电容器组三相开合试验回路,应用等效电路推导了涌流峰值I_(bi)和涌流频率f_(bi)的一般计算公式,并得出在试验电压12 kV,关合涌流峰值20 kA,开断电流分别为400 A和800 A时,线路长度l和电容值CS、涌流频率f_(bi)之间的量化关系,结果表明线路长度l与电容值C_(S)呈正相关,与涌流频率f_(bi)呈负相关。最后,应用3200 MVA冲击发电机试验系统,配置电源回路和负载回路的三相电容器组,进行了额定电压12 kV断路器背对背电容器组开合试验,关合涌流峰值I_(bi)和涌流频率f_(bi)均满足标准要求,验证了文中计算方法和试验回路的正确性和有效性。The back-to-back capacitor bank switching test is an important type test item for assessing the re-strike probability of circuit breaker in switching the capacitor banks.In view of the difficulty in accurately adjusting the making inrush current peak I_(bi)and the inrush current frequency f_(bi)during the testing process,a three-phase switching test circuit using the impulse generator as power source is proposed on the basis of analysis of requirements of China National Standards.The general calculation formulas for inrush current peak I_(bi)and inrush current frequency f_(bi)are derived by using equivalent circuits,and the quantitative relationship among the line length l,capacitance CS and inrush frequency f_(bi)is obtained at the test voltage of 12 kV,the inrush current of 20 kA,and the breaking current of 400 A and 800 A,respectively.The results show that the line length l is positively correlated with with C_(S)and negatively correlated with f_(bi).Finally,the back-to-back capacitor bank switching test of circuit breaker at rated voltage of 12 kV is performed by using a 3200 MVA impulse generator test system,together with three-phase capacitor banks of power circuit and load circuit,both the making inrush current peak I_(bi)and inrush current frequency f_(bi)meet the standard requirements,and the correctness and effectiveness of the calculation method as well as the test circuit in this paper are verified.

关 键 词：断路器 背对背电容器组 关合涌流 涌流频率 冲击发电机 

分 类 号：TM561[电气工程—电器] TM53