不同工况下交流滤波器小组断路器单相重击穿的过电压研究

Study on Single-phase Restrike Overvoltage of ACF Sub-bank Circuit Breaker Under Different Conditions

直流输电工程中,交流滤波器小组断路器处于交直流混合工况,有一定的概率发生单相重击穿故障。基于考核小组内其他元件绝缘水平的考虑,选取了一条在运的直流输电线路,按照实际的各主设备参数搭建了仿真模型;再依照运行规程设置了2种代表性的工况,模拟断路器发生单相单次重击穿时,交流滤波器小组内各元件两端电压与高压端对地电压的过电压水平;并与各元件的操作冲击绝缘水平进行对比,为交流滤波器小组的设计、运行、维护等提供参考和指导。

In the DC transmission project, alternating current filter（ACF） sub-bank circuit breakers are at AC/DC hybrid condition and has the certain probability in occurrence of single phase restrike fault.With consideration of insulation level of other components in the ACF sub-bank, a transmission line in operation is selected and the simulation model is set up in accordance with parameters of each actual main equipment and, two kinds of representative conditions are set in accordance with the operation rule to simulate the end voltage and the over voltage of HV side to the ground of each components inside the ACF in case of single- phase and single time restrike of circuit breaker.The comparison between simulated overvohage and the switching impulse insulated level is made so to provide reference and guidance for the design, operation and maintenance of the ACF sub-bank.