特高压电容器组专用断路器开断特性及试验研究  

Research on Breaking Characteristics of Dedicated Circuit Breaker for UHV Capacitor Bank

作　　者：隋玉秋[1] 李学斌[1] 赵义松[1] 王飞鸣[1] 程远[1] 韩洪刚[1] 

机构地区：[1]国网辽宁省电力有限公司电力科学研究院,沈阳110006

出　　处：《高压电器》2016年第11期34-41,46,共9页High Voltage Apparatus

摘　　要：特高压电容器组专用断路器不但要满足短路大电流的开断要求,而且要保证额定小电流开断后不发生重击穿。文中比较分析不同灭弧室结构的绝缘性能和冷态介质恢复特性,确定最佳的灭弧室结构。计算额定1.6 k A小电流短燃弧和短路40 k A大电流开断特性,搭建试验回路,测量不同开距下的击穿电压值。结果表明:灭弧室内引弧环结构增大弧触头间的电场值,降低冷态开断介质恢复速度和击穿裕度;屏蔽罩结构对大喷口打开后的弧触头间电场分布具有屏蔽作用;小电流电弧燃弧时间越短,击穿裕度值越小,尽量避免燃弧时间小于0.5 ms,保证弧后具有较大的击穿裕度。预测开断短路电流的最短燃弧时间为15 ms,断路器对开断短路长燃弧的稳定性较高,介质恢复速度较快。文中计算结果与试验结果基本吻合,由于试验击穿点存在分散性,在刚分时刻后0.5 ms内存在重击穿的可能,分闸过程应避免在此时间范围内熄弧,保证燃弧时间大于0.5 ms。Dedicated circuit breaker for UHV capacitor bank must meet the breaking requirement for large shortcircuit current, and ensure absence of breakdown after breaking small current. In this study, the cold dielectric recovery and insulation characteristics of different arc interrupter structures were analyzed and compared to determine the best interrupter structure. The breaking characteristics for rated 1.6 kA small short-circuit current and 40 kA large current were calculated. Test circuit was different open distances. The results showed that： 1）The built to measure the values of breakdown voltage under arc ring structure enhanced the electric field of the arc contacts, resulting in the decrease in recovery speed of breaking dielectric and breakdown margin; 2）The shield structure shielded the electric field distribution between arc contacts; and 3）The shorter the small current arcing time, the smaller the breakdown margin, so it is necessary to keep the arcing time longer than 0.5 ms to ensure a large breakdown margin. The predicted minimum arcing time for breaking short-circuit current was 15 ms. Calculated results agreed with the experimental breakdown may occur within 0.5 ms after breaking data. Since the breakdown points in the test are dispersive, , so arc extinguishment should avoid this time range.

关 键 词：特高压 SF6 断路器 开断特性 介质恢复特性 动态击穿试验 

分 类 号：TM561[电气工程—电器]