山火对10~35 kV输电线路安全运行影响试验研究

Experimental Research on Influence of Mountain Fire on Safe Operation of 10~35 kV Transmission Lines

文中设计搭建了山火对10 kV、35 kV输电线路安全运行影响试验研究平台,燃烧松木、稻草和灌木模拟10 kV、35 kV输电线路下发生山火,研究了山火条件下输电线路三相电压、导线对地泄漏电流、零序电压变化特性;研究分析了火焰高度、火焰宽度对10 kV输电线路绝缘的影响。试验结果表明:山火能引起输电线路单相高阻接地和相间短路;造成单相高阻接地和相间短路是电压等级、对地距离、火焰高度、火焰宽度等多种因素共同作用的结果;火焰是否桥接空气间隙是影响空气绝缘的重要因素。研究了试验过程中出现的输电线路对火焰放电、受火焰影响的某相电压低于其他相电压等现象,得出了山火对10 kV、35 kV输电线路影响原因和规律。

An experimental research platform for the impact of mountain fire on safe operation of 10 kV and 35 kV transmission lines is designed and established.Pine,straw and shrubs are burnt to simulate the mountain fire fault of 10 kV and 35 kV transmission lines,and the variation characteristics of three-phase voltage,conductor to ground leakage current and zero-sequence voltage of transmission lines under mountain fire are studied.The effects of flame height and flame width on the insulation of 10 kV transmission line are studied and analyzed too.The test results show that mountain fire can cause single-phase high resistance grounding and phase to phase short circuit of transmission line,which are the results of the joint action of voltage level,distance to ground,flame height,flame width and other factors,and whether the flame bridges the air gap is an important factor affecting air insulation.The phenomena that the transmission line discharges to the flame and the voltage of one phase affected by the flame is lower than that of other phases during the test are studied,and the causes and laws of mountain fire on 10 kV and 35 kV transmission lines are obtained.