山火对空气间隙绝缘击穿特性影响试验研究

Experimental Research on Influence of Mountain Fire on Insulation Breakdown Characteristics of Air Gap

摘要:

近年来，山火频发给电网安全稳定运行带来了巨大威胁。山火会导致架空输电线路间隙绝缘强度显著下降，从而引发线路跳闸，造成线路出现停运等严重事故。文中设计了“棒-棒”电极空气间隙放电模型，开展了“棒-棒”模型的空气间隙绝缘击穿试验，研究了火焰、温度、烟雾对间隙绝缘的影响。试验研究表明，火焰高度和温度对间隙击穿特性影响较大，温度是影响间隙击穿特性的决定性因素。所研究数据可为输电线路预防山火跳闸事故提供参考。

Abstract:

In recent years, the frequently happening of mountain fire has brought a great threat to the safe and stable operation of power grid. Mountain fire will cause the insulation strength of overhead transmission line gap to decrease significantly, resulting in line tripping, line shutdown and other serious accidents. So a "rod-rod" electrode air gap discharge model is designed, the air gap insulation breakdown test of the "rod-rod" model is carried out, and the influence of flame, temperature and smoke on gap insulation is studied. The results show that the flame height and temperature have a great influence on the gap breakdown characteristics, and the temperature is the decisive factor affecting the gap breakdown characteristics. The research results can provide a reference for the prevention of mountain fire tripping accidents in transmission lines.