基于抑制建弧率的新型喷射气流灭弧防雷间隙机理研究

发布时间：2018-12-31 15:35

【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。
[Abstract]:In order to greatly reduce the lightning tripping rate of the line, a new type of jet airflow arc extinguishing and lightning protection gap based on the suppression of arc building rate is studied. In this method, the lightning discharge path is first transferred to the parallel gap, and the lightning stroke current is used to synchronously trigger the high speed jet flow in order to quickly extinguish the subsequent power frequency arc and realize the ideal effect of "flashover does not build arc". The transient arc model of jet flow coupling is established, and the arc extinction criterion is obtained. By introducing the relevant parameters, the calculation model of the arc building rate of the line under the condition of jet flow is established. The experiment of arc extinguishing and the effect of restraining arc building are carried out. Finally, the actual operation effect is analyzed. The results show that the arc can be completely extinguished within 3 ~ 4 ms. When the jet velocity is more than 500m / s, the insulation arc building rate can be reduced to less than 1.5%. In practice, the lightning gap can greatly reduce the lightning tripping rate of 35 kV lines by about 90%, which verifies the effectiveness and practicability of the method.
【作者单位】：广西大学电气工程学院;
【基金】：国家自然科学基金(50867002)~~
【分类号】：TM863

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