摘要
为了大幅度降低线路雷击跳闸率,研究了一种基于抑制建弧率的新型喷射气流灭弧防雷间隙。这种方法将雷击放电路径优先转移至并联间隙,利用雷击电流同步触发高速喷射气流以快速熄灭后续工频电弧,实现＂闪络不建弧＂的理想效果。建立了喷射气流耦合暂态电弧模型,得出了电弧熄灭判据。通过引入相关参数建立了喷射气流条件下线路建弧率计算模型。进行了灭弧实验及抑制建弧效果实验统计,最后分析了其实际运行效果。结果表明,喷射气流可在3～4 ms内完全熄灭电弧,当喷射气流速度达到500 m/s以上时,绝缘建弧率能够减小到1.5%以内,达到了近似理想的抑制建弧效果。在实际运行中,该防雷间隙能够大幅度降低35 kV线路的雷击跳闸率90%左右,以此验证了该方法的有效性及实用性。
In order to radically reduce the lightning trip-out rate of transmission lines, we developed a jet stream arc-extinguishing lightning protection gap （JSALPG） based on the idea of suppressing arc-establishing rate. Through transferring the lightning stroke discharge path to a parallel gap preferentially, the high-speed jet stream synchronously triggered by lightning current could interrupt subsequent power frequency arc rapidly, and realize the ideal condition of flashover without arc-establishing. We established a jet stream coupling transient arc model to deduce an arc-extinguishing criterion, and after the introducing some relative parameters, we acquired an arc-establishing rate for- mula under jet stream condition. Then we conducted the arc-extinguishing tests and the experimental statistics of the suppressing effect on arc-establishing, as well as the field performance tests of JSALPG. The results indicate that the JSALPG is able to completely extinguish arc within 3--4 ms, and the arc-establishing rate is reduced to less than 1.5% when the speed of jet stream is more than 500 m/s, which is nearly the ideal result of suppressing arc-establishing. In field operation situation, the JSALPG reduces the lightning trip-out rate of a 35 kV line by about 90%, proving it to be effective and practicable.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第9期2862-2870,共9页
High Voltage Engineering
基金
国家自然科学基金(50867002)~~
关键词
建弧率
并联间隙
喷射气流
闪络不建弧
耦合暂态电弧模型
抑制建弧效果
雷击跳闸率
arc-establishing rate
parallel gap
jet stream
flashover without arc-establishing
coupling transient arc model
effect of suppressing arc-extinguishing
lightning trip-out rate
