长距离输电线路潜供电弧弧根跳跃与弧长剧变的物理机制与仿真  

Physical Mechanism and Simulation Method of the Arc Root Jumping and Arc Length Variation of the Secondary Arcs with Long-Distance Transmission Lines

作　　者：行晋源 李庆民 丛浩熹 李劲松 陈强 李庆余[4] 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]四川电力设计咨询有限责任公司,成都610016 [3]山东大学电气工程学院,济南250061 [4]中国电力科学研究院,北京100192

出　　处：《电工技术学报》2016年第12期90-98,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51277061;51420105011);国家电网公司科技项目(GY71-14-032)资助

摘　　要：建立了长距离输电线路潜供电弧物理模拟实验平台,使用高速摄像仪拍摄潜供电弧的运动发展过程。实验发现,潜供电弧阳极弧根存在明显的跳跃现象,且潜供电弧运动过程中电弧长度经常出现暂时变短的现象,在电弧熄灭前的瞬间,电弧长度会急剧上升。为明晰引起上述现象的内在作用机制,建立了链式电弧模型,对长距离输电线路潜供电弧进行仿真分析,结果表明弧根跳跃与热浮力和电极结构密切相关,电极结构水平时潜供电弧弧根跳跃次数明显减少,更有利于电弧的疏导与熄灭。电弧长度暂时变短是由弧柱间短路引起的,而熄灭前潜供电流突然增大引起弧长的剧变。进一步研究了潜供电弧燃弧时间与风力之间的关系,风速较大时,风载荷在电弧受力中占主导作用,燃弧时间分散性较小。仿真还发现导线互相垂直时潜供电弧运动更为剧烈复杂,电弧更容易熄灭。A physical simulation platform of the secondary arcs with long-distance transmission lines was established, and the high-speed camera recorded the motion development process of the secondary arcs. During the motion process of the secondary arc, the anode arc root had obvious jump phenomena, the arc length usually became short, the arc length increased dramatically before the arc extinguished. In order to clarify the inherent mechanism of the above phenomena, an arc chain model was adopted to simulate the secondary arcs with long-distance transmission lines. The results showed that the arc root jumping was closely related to the thermal buoyancy and electrode structure. The arc root jumping frequency significantly reduced when the electrode structure was horizontal, which would facilitate the arc extinguishing. Arc length temporarily became short because of the short circuit between the arc column, while the secondary current suddenly became bigger before the arc extinguished would increase the arc length dramatically. The wind load was in a dominant position in all forces and the dispersion of arcing time was small when the wind speed was big. The results also found that the motion of the secondary arc was more complex and the arc was more likely to go out under the condition of wire perpendicular.

关 键 词：长距离输电 潜供电弧 物理模拟 弧根跳跃 电弧长度 风力 电流方向 

分 类 号：TM835[电气工程—高电压与绝缘技术]