10kV架空线路雷击断线故障的模拟试验研究  

Simulation Tests on Lightning Stroke-Caused Wire-Breakage of 10 kV Overhead Transmission Line

作　　者：沈海滨[1] 陈维江[2] 王颂虞[3] 贺子鸣[1] 陈艳霞[4] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]国家电网公司,北京市西城区100031 [3]北京电力公司,北京市西城区100031 [4]北京电力试验研究院,北京市丰台区102400

出　　处：《电网技术》2011年第1期117-121,共5页Power System Technology

摘　　要：近年来,我国配电网架空线路雷击断线故障时有发生,严重干扰了电网的运行安全,了解雷击断线产生的机制是解决上述问题的关键。已有的研究成果主要集中在定性理论分析上,缺少试验论证。在实验室中模拟了架空线路遭受雷击后对地放电和工频续流起弧燃烧2个过程,重点研究了10 kV系统典型短路故障条件下工频续流电弧烧损导线的情况。研究结果揭示了续流电弧弧根能否自由移动是裸导线耐弧能力强而绝缘导线耐弧能力弱的根本原因,试验验证了工频续流起弧后绝缘导线必断线而裸导线断线概率极低,为架空线路雷击断线防护提供了指导,即绝缘导线有必要采取防雷击断线保护措施而裸导线并非必要。In recent years the lightning stroke-caused wire-breakage faults occasionally happen in overhead distribution lines in China and these faults seriously jeopardize the secure operation of power grid, so it is the key for the solution of this problem to make the mechanism leading to lightning stroke-caused wire-breakage clear. Existing research results pay attentions on qualitative theoretical analysis and the experimental verification is in absence. Two processes, i.e., the line to earth discharge as well as arcing and combustion caused by power frequency sustaining current of lightning-stroke overhead line, are simulated in laboratory, and the conductor burning in 10 kV distribution system caused by arc due to power frequency sustaining current under the condition of typical short-circuit fault is mainly researched. Research results reveals that whether the root of arc caused by power frequency sustaining current can freely move or not is the basic reason of the phenomena that the arc-resistant performance of bare conductor is strong and the arc-resistant performance of insulated conductor is weak. Experimental results validate the fact that after the arcing due to power frequency sustaining current the breakage of the insulated conductor is inevitable and yet the breakage probability of bare conductor under the same condition is very low. The obtained conclusion is available for the prevention of wire-breakage of overhead transmission line due to lightning stroke, namely it is necessary to adopt the measure to prevent wire-breakage of lightning- stroke insulated overhead transmission lines and it is not necessary to adopt such a measure for overhead transmission line using bare conductors.

关 键 词：绝缘导线 裸导线 雷击断线 雷电放电 续流 电弧 

分 类 号：TM86[电气工程—高电压与绝缘技术]