均压电容对多级石墨间隙击穿特征影响的试验研究  

Experimental Study on the Influence of Grading Capacitor on Breakdown Characteristics of Multi-stage Graphite Gap

作　　者：孙涌 杜志航 李洪阳 SUN Yong;DU Zhihang;LI Hongyang(Beijing Leishan Testing Service Center of Lightning Protection Facilities Beijing 102299,China;Shanghai Electric Power Design Institute Co.,Ltd.,Shanghai 210025,China)

机构地区：[1]北京市雷闪防雷设施检测服务中心,北京102299 [2]上海电力设计院有限公司,上海210025

出　　处：《电力电容器与无功补偿》2021年第3期69-73,111,共6页Power Capacitor & Reactive Power Compensation

摘　　要：为研究多级石墨间隙型中均压电容CE(-grading capacitor)-对其在1.2/50-μs冲击电压波作用下的击穿特性,将电容器的等效电路在时域和频域进行理论计算,对均压电容CE的不同取值结果的冲击电压的耦合能力进行试验验证;并将取值结果应用于多级石墨间隙的冲击电压波击穿特征试验,得到均压电容CE的电容量应大于1 nF取值最为合理;以残压和整体击穿时间为表征,电容量相对低的试品在低冲击电压的幅值下表现出残压下降40%,整体击穿时间缩短90%,相反在高冲击电压的幅值下表现更好。通过试验研究,建议针对多级石墨间隙均压电容取值在1~12 nF之间。For studying the breakdown characteristics of the grading capacitor CE(grading capacitor)in the multistage graphite gap under the action of 1.2/50-ms impulse voltage,the equivalent circuit of the capacitor is calculated theoretically in time and frequency domain.The coupling ability of impulse voltage with different values of grading capacitor CE is tested and verified.The results are applied to the breakdown characteristic test of impulse voltage wave of multistage graphite gap.It is found that the capacitance of grading capacitor CE,which is greater than 1 nF,is the most reasonable value.From point of view of residual voltage and overall breakdown time,the sample with relatively low capacitance shows that residual voltage reduces 40%and the overall breakdown time shortens 90%at the amplitude of low impulse voltage and,on the contrary,their performances at high impulse voltage amplitude are better.It is suggested through test and study that the capacitance of CE in the multi stage graphite gap shall be between 1 nF and 12 nF.

关 键 词：多级石墨间隙 均压电容CE 1.2/50-μs冲击电压 耦合效率 

分 类 号：TM774[电气工程—电力系统及自动化] TQ127.11[化学工程—无机化工]