35 kV复合材料杆塔接地引下线空气间隙选择研究  

Research on Air Gap Selection of Down-Lead Line to Ground for 35 kV Composite Material Tower

作　　者：张晓琴[1,2] 方书博[1,2] 李牧[1,2] 叶春勇[1,2] 赵恒亮[3] 陈坤[1,2] ZHANG Xiaoqin;FANG Shubo;LI Mu;YE Chunyong;ZHAO Hengliang;CHENG Kun(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;Wuhan NARI Limited Liability Company of State Grid Electric Power Research Institute,Wuhan 430074,China;Yiwu Power Transmission and Distribution Engineering Co.,Ltd.,Yiwu 322007,China)

机构地区：[1]南瑞集团公司(国网电力科学研究院),南京211106 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [3]义乌市输变电工程有限公司,浙江义乌322007

出　　处：《电瓷避雷器》2019年第4期141-145,共5页Insulators and Surge Arresters

摘　　要：35 kV电力复合材料杆塔主要采用塔身引下线接地,其电气绝缘主要体现在相导线与接地引下线之间的空气间隙对系统过电压的耐受能力,为了研究复合材料塔身与引下线间空气间隙对系统过电压绝缘配合水平,开展了35 kV复合材料塔头复合方管横担相导线对引下线雷电及操作冲击过电压放电试验,获得了不同间隙距离的50%操作冲击放电电压和雷电过电压值,绘制了空气间隙距离随放电电压变化曲线,确定了35 kV配网系统最大过电压下复合杆塔接地引下线对塔身的空气间隙值为35 cm.At present,35 kV power transmission composite material tower is grounded mainly by downlead line,and its electrical insulation embody mainly in the tolerance of air-gap to over-voltage between the down-lead line and tower tube.In order to study the over-voltage insulation coordination level of the air-gap,the lightning and switching impulse over-voltage discharge tests are performed on 35 kV composite square tube cross-arm between phase conductor to down-lead line.50%switching impulse discharge voltage and lightning over-voltage for different air-gap distance are obtained,and the curve of air-gap distance varying with discharge voltage is drawn.The air-gap distance is determined to be 35 cm between down-lead line and tower under the maximum over-voltage condition of 35 kV distribution network system.

关 键 词：复合材料杆塔 接地引下线 空气间隙 过电压耐受 绝缘配合 复合方管横担 

分 类 号：TM8[电气工程—高电压与绝缘技术]