西藏高海拔地区输电线路沿线雷电地闪时空分布特征  

Spatio-temporal Characteristics of the Cloud-to-ground Lightning Activity Along the Transmission Lines in the Tibet High-altitude Area

作　　者：赵多青 谷山强[2,3] 王宇 李健[2,3] 王佩 李畅[4] ZHAO Duoqing;GU Shanqiang;WANG Yu;LI Jian;WANG Pei;LI Chang(State Grid Tibet Electric Power Co.,Ltd.,Lhasa 850001,China;Wuhan NARI Co.,Ltd.of State Grid Electric Power Research Institute,Wuhan 430074,China;Hubei Province Key Laboratory of Lightning Risk Prevention for Power Grids,Wuhan 430074,China;State Grid Tibet Electric Power Research Institute,Lhasa 850001,China)

机构地区：[1]国网西藏电力有限公司,拉萨850001 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [3]电网雷击风险预防湖北省重点实验室,武汉430074 [4]国网西藏电力有限公司电力科学研究院,拉萨850001

出　　处：《高电压技术》2023年第7期3090-3101,共12页High Voltage Engineering

基　　金：国家电网公司科技指南项目(524625200017)。

摘　　要：为了对西藏电网更加科学、有针对性的开展防雷工作,基于电网广域雷电地闪监测系统数据,分析了西藏220 kV及以上电压等级输电线路沿线区域和受雷害影响严重的220 kV“虎墨线”线路走廊区域内的地闪时空分布特征。分析结果表明:输电线路沿线地闪密度分布呈“东西多–中部少”的特征。线路沿线主要有3个地闪密度高值区域,依次是拉萨地区、昌都以东地区和加查地区,而林芝地区地闪密度最低。输电线路沿线每年约95%地闪发生在4—9月,峰值主要出现在6、7月份。地闪活动总体存在先自东向西发展,再向东回退的过程。东部昌都地区闪电活动主要集中在5—9月,西部拉萨地区地闪则集中在6—8月。地闪活动峰值普遍出现在当地时间15—18时,西部拉萨、日喀则地区正地闪峰值滞后于地闪峰值,而东部昌都地区则超前地闪峰值。输电线路附近以单回击地闪为主导,负地闪强度明显表现为东高西低的分布,输电线路附近东西两端负地闪平均电流强度分别约为–40 kA和–20 kA。220 kV“虎墨线”线路建成投运后,西部区段出现较大的地闪活动增幅,地闪密度从B1级(0.8次/(km^(2)·a)≤NG<2次/(km^(2)·a))增长到B2级(2.0次/(km^(2)·a)≤NG<2.8次/(km^(2)·a));且线路走廊内的正地闪活动明显增强,正地闪密度和占比分别平均提升2.7倍和2.3倍,这可能和线路杆塔引雷特性存在一定关联。In order to carry out more scientific and targeted lightning protection for Tibet’s power grids,based on the data collected by the wide-area lightning location system operated by State Grid Corporation of China,the spatio-temporal distribution characteristics of the Cloud-to-ground(CG)lightning along the transmission lines with voltage level of 220 kV and above in Tibet,and specifically,over the 220 kV“Humo Line”corridor area,which is seriously affected by lightning damage,were analyzed.The results show that the distribution of lightning density along the transmission lines is“more in the east and west but less in the middle area”.There are three main areas along the lines with high lightning density,namely Lhasa,Changdu and Jiacha,while Linzhi area has the lowest lightning density.About 95%of the CG lightning along the transmission lines occur from April to September every year,and the peak value mainly occurs from June to July.The lightning activity generally develops from the east to the west and then retreats to the east.The lightning activity in Changdu area in the east is mainly concentrated in May to September,while that in Lhasa area in the west is concentrated in June to August.The peak value of CG lightning activity generally appears at 15:00—18:00(local time).The positive CG lightning peak value in Lhasa and Shigatse in the west lags behind the CG lightning peak value,while that in Changdu in the east is ahead of the CG lightning peak value.The area near the transmission lines is dominated by single return stroke CG lightning.The negative CG lightning current is obviously high in the east and low in the west.The average current of negative CG lightning at the east and west ends near the transmission line is about–40 kA and–20 kA,respectively.After the 220 kV“Humo Line”is completed and put into operation,there is a significant increase in CG lightning activities in the western section,CG lightning density increases from Level B1(0.8 flashes/(km^(2)·a)≤NG<2 flashes/(km^(2)·a))to L

关 键 词：西藏高海拔地区 地闪 雷电监测系统 时空分布 输电线路 

分 类 号：TM863[电气工程—高电压与绝缘技术]