火焰高度对输电线路间隙击穿特性的影响

山火可使架空输电线路间隙的绝缘强度显著下降，可能引发线路跳闸，导致线路出现停运的严重事故。近年来，山火频发给电网的安全稳定运行带来了巨大威胁。利用木垛火模拟山火，开展了火焰高度对模拟输电线路间隙击穿特性的影响研究。研究表明，火焰高度对间隙的击穿特性影响较大，火焰高度与击穿电压之间具有二次函数关系。研究成果可为输电线路防山火跳闸提供一定的指导。

Study on the Influence of Flame Height on Gap Breakdown Characteristics of Transmission Lines

Forest fires can make the gap insulation strength of overhead transmission lines decrease significantly, which may cause transmission-line tripping and lead to serious power outage accidents. In recent years, frequent forest fires have brought a great threat to the safety of the power grid. In this paper, wood-chock fire is used to study the influence of flame height on the gap breakdown characteristics of transmission lines. The simulated results show that the flame height has a significant effect on the gap breakdown characteristics and the flame height and breakdown voltage have a relationship of quadratic function, which can provide an useful guidance for tripping prevention of transmission lines in case of forest fires.