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通过调研湖南省某处山火诱发500kV高压输电线路跳闸的事故,以桂山乙线454#杆塔为代表,分析此次山火成因、等级、类型和强度,分析空气温度和相对湿度、风速和风向对山火形成和发展影响以及山火作用下线路跳闸行为、类型、成因和机理。结果发现:诱发桂山甲乙同塔双回线路跳闸的山火为火线强度高于10 MW/m的高强度地表火,后在风速和风向作用下转为高强度冲冠火和被动型树冠火;紧凑型交流线路易发生相间放电,桉树和茅草等植被型扩散性火焰产生的大量导电性离子和电子及针状烟尘颗粒促发和加剧了这一过程,直至形成电子崩和流注通道,诱发线路跳闸。
By investigating the accident of 500kV high voltage transmission line trip caused by mountain fire in some area of Hunan Province, this paper analyzed the cause, level, type and intensity of mountain fire with the 454 # tower of Guishan Line B as an example, analyzed air temperature and relative humidity, wind speed and direction The impact on the formation and development of mountain fire and the trip, type, cause and mechanism of line trip under the action of mountain fire. The results showed that the mountain fire which triggered the tripping of the double circuit of the same tower in Gui Shan was a high intensity surface fire with a fire line intensity higher than 10 MW / m, and then turned to high intensity red fire and passive crown fire under the action of wind speed and direction. The compact AC lines are prone to interphase discharge, and the large number of conductive and electron and acicular soot particles from the diffuse flames of vegetation, such as eucalyptus and thatch, contribute to and exacerbate this process until the electron collapse and flow-through channels are induced and induced Line trip.