500kV串补装置火花间隙放电特性试验研究

为解决500 k V串补装置火花间隙自触发问题,分析了火花间隙系统的构成及工作原理,针对主间隙的放电分散性设计了试验回路及方案,并利用某串补站退出运行的火花间隙,测量了不同间隙距离下的击穿电压,以及固定间隙距离下不同污秽的击穿电压。结果表明,火花间隙击穿电压分散性较大,交流击穿电压峰值分散区间为±7 k V;电极上存在污秽物时,间隙的击穿电压最低约降至洁净电极理论击穿电压值的65.0%。

Experimental Study on the Discharge Characteristics of the Spark Gap in 500kV Series Compensation Device

500 kV series compensation device bypass accidents caused by spark gap self-triggering in series compensation device pose a threat to the long distance power transmission, and also influence the safety and stability of the power grid. In this paper, the struc- ture and operation principles of the spark gap are analyzed. The test circuit and test scheme are designed for the discharge dispersion of the main gap. A test is carried out of a certain spark gap in a series compensation station, and its discharge characteristics are studied. The results show a large dispersion of breakdown voltage in the spark gap. The discrete interval of AC breakdown peak voltage is ± 7 kV. When pollutant is placed on the electrodes, the breakdown peak voltage is dropped down to 65.0% of the theoretical value of clean electrodes.