全火焰条件下植被燃烧特征量对导线-板间隙击穿特性的影响  

Influence of Vegetation Combustion Features on Breakdown Characteristics of Conductor-Plane Gap Under Full Flame Condition

作　　者：黎鹏[1] 黄道春[1] 阮江军[1] 魏晗[1] 吴传平[2] LI Peng HUANG Daochunl RUAN Jiangjun WEI Han WU Chuanping(School of Electrical Engineering, Wuhan University, Wuhan 430072, Hubei Province, China State Key Laboratory of Disaster Prevention ＆ Reduction for Power Grid Transmission and Distribution Equipment（State Grid Hunan Electric Power Company）, Changsha 410100, Hunan Province, China)

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]电网输变电设备防灾减灾国家重点实验室(国网湖南省电力公司),湖南省长沙市410100

出　　处：《电网技术》2016年第10期3250-3257,共8页Power System Technology

基　　金：国家自然科学基金面上项目(51677138);高等学校博士学科点专项科研基金(20120141120027);中央高校基本科研业务费专项资金(2015207020201)

摘　　要：近年来,输电线路走廊山火频发严重威胁电网的安全稳定运行。选取了山火条件下易引发线路跳闸的典型植被,对其燃烧特性和全火焰条件下导线-板间隙的交直流击穿特性开展了试验研究,并提取了热释放速率、火焰温度、高度和电导率等燃烧特征量,分析了燃烧特征量对全火焰条件下间隙击穿特性的影响机制。结果表明,不同植被类型火焰对间隙击穿特性的影响差异较大,尤其在杉树枝火焰下,导线-板间隙的工频击穿电压和直流正极性击穿电压分别下降为纯空气间隙的10%和6%左右;间隙击穿电压存在明显极性效应,直流正极性下间隙的击穿电压低于直流负极性;植被火焰的电导率是间隙绝缘强度下降的主要原因,其次为热释放速率和火焰高度,火焰温度的影响较小。1： In recent years, frequent occurrence of forest fire in transmission line corridors bring a serious threat to safe and stable operation of power grid. Typical vegetations prone to cause line tripping were selected. The tests of combustion characteristics, AC and DC breakdown characteristics of conductor-plane gap under full flame condition were investigated. The combustion features, such as heat release rate, flame temperature, height and conductivity were extracted and the influence mechanism of combustion features on breakdown characteristics of gap under full flame condition was analyzed. Results show that, the effect of different types of vegetation flame on breakdown characteristics of gap is obviously different. Especially under fir branches flame, AC and DC positive polarity breakdown voltage of gap can be reduced to about 10% and 6% of that in the pure air gap, respectively. The breakdown voltage of gap has an obvious polarity effect, and breakdown voltage for DC positive polarity is smaller than that for DC negative polarity. Conductivity of vegetation flame is a main factor causing gap dielectric strength to decline, followed by heat release rate and flame height, and the temperature of flame has little effect.

关 键 词：山火 输电线路 燃烧特征量 击穿特性 

分 类 号：TM86[电气工程—高电压与绝缘技术]