输电线路雷击跳闸率分级评估方法研究
童杭伟1,王灿灿2,杨健伟2,王少华1
(1 国网浙江省电力公司电力科学研究院,浙江 杭州 310014;
2 国网浙江丽水供电公司,浙江 丽水 323000)
摘 要: 雷击跳闸对电网的安全运行和供电可靠性构成了严重威胁。介绍了输电线路雷击跳闸率的理论值和实际值计算方法,提出了雷击跳闸率分级评估方法,并应用于工程实际。结果表明:采集精确的地闪密度数据,准确计算输电线路雷击跳闸率是雷击风险评估的重要基础;雷击跳闸评估可采用雷击跳闸率与线路雷击跳闸率指标的对比方法,风险级别分为4 级;浙江220 kV楠丽线133 基杆塔中,70% 的杆塔雷击跳闸风险等级为C 级及以上,建议优先进行防雷改造。
关键词: 输电线路;雷击跳闸率;分级评估;防雷;地闪密度
中图分类号:TM726 文献标识码:A 文章编号:1007-3175(2015)03-0017-04
Study on Grading Assessment Method of Lightning Trip-Out Rate of Transmission Lines
TONG Hang-wei1, WANG Can-can2, YANG Jian-wei2, WANG Shao-hua1
(1 State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014 , China;
2 State Grid Zhejiang Lishui Power Supply Company, Lishui 323000, China)
Abstract: The lightning trip-out rate has seriously threatened the safe operation and reliable power transmission of power grid. Introduction was made to the theoretical values and actual calculation methods of lightning trip-out rate in transmission lines. This paper put forward the grading evaluation method of lightning trip-out rate and put it in the real project application. The result shows that the accurate acquisition of flash density data and the right calculation of lightning trip-out rate is the key foundation for risk assessment. Lightning trip-out rate grading assessment could be performed by comparing the indexes between the lightning trip-out rate and the lightning line trip-out rate and the level of risk is divided into four grades. Taking the level of risk of 133 base towers in 220 kV transmission line of Nanli in Zhejiang province as an example, 70% of them is C-level or above. It is concluded that lightning protection transformation should be carried out in priority.
Key words: transmission line; lightning trip-out rate; grading assessment; lightning proof; flash density
参考文献
[1] 施围,郭洁.电力系统过电压计算[M].北京:高等教育出版社,2006.
[2] 李长旭.输电线路防雷性能研究[D].吉林:东北电力大学,2008.
[3] 龚坚刚,童杭伟.基于雷电定位系统的浙江电网线路雷击跳闸率评估[J].华东电力,2007,35(1):73-75.
[4] 王少华,叶自强.恶劣气候对浙江电网输电线路的影响[J].中国电力,2011,44(2):19-22.
[5] 童杭伟,范国武,王海涛. 浙江省雷电活动的特点及其与地形和气候的关系[J]. 电网技术,2008,32(11):99-100.
[6] 赵淳, 阮江军, 李晓岚, 等. 输电线路综合防雷措施技术经济性评估[J]. 高电压技术,2011,37(2):290-297.
[7] 赵淳,陈家宏,王剑,等.电网雷害风险评估技术研究[J].高电压技术,2011,37(12):3012-3021.
[8] 陆国俊,熊俊.输电线路防雷性能评估关键技术研究[J].南方电网技术,2010,4(S1):85-89.
[9] 谷山强,陈家宏,陈维江,等. 输电线路防雷性能时空差异化评估方法[J]. 高电压技术,2009,35(2):294-298.
[10] 王俊凯,何晓,徐航.基于EGM模型的三维防雷评估与实例分析[J].电瓷避雷器,2014(2):108-114.
[11] 王清玲,周文斌,谷山强,等. 阳江地区典型输电线路防雷评估与综合治理研究[J]. 广东电力,2012,25(2):46-49.
[12] 赵淳,谷山强,童雪芳,等. 多层次电网雷害风险评估体系研究[C]// 第28 届中国气象学会年会,2011:1-8.
[13] DL/T 620-1997 交流电气装置的过电压保护和绝缘配合[S].