摘要
10 kV架空线路雷击跳闸率高,而可用的防雷措施较少,需对防雷方法进行综合应用以全面提高其耐雷水平。针对单独架设耦合地线无法提高其直击线路耐雷水平与耦合地线分段对线路感应雷耐雷水平的影响,本研究提出了一种综合性防雷方式,其方法是将MOA与耦合地线结合应用于10 kV架空配电线路。基于ATP-EMTP建立10 kV架空配电线路过电压模型,并考虑MOA允许通过的能量阈值。结果表明,MOA安装于10 kV架空配电线路的最高相和一边相,且在左右各1基安装时,在不需额外施加杆塔降阻措施下,仍具有最佳的直击雷防护效果,与耦合地线配合使用,可全面提高线路耐雷水平,具有更好的技术经济性。在雷击杆塔和感应雷作用下,当耦合地线分段间隔3基及以内杆塔时,建议在分段间隔处(包含2端)的逐级杆塔最高相和一边相安装MOA;当耦合地线分段间隔3基以上杆塔时,在分段间隔的逐级杆塔同时装设三相MOA是较好的选择,其优点是能够解决由于耦合地线分段使用而造成的耐雷水平降低的现象。得出的结果有利于综合性的使用10 kV架空线路防雷方法,全面提高10 kV架空线路的耐雷水平。
10 kV overhead lines have a high lightning-strike trip rate,but there are fewer lightning protection measures available.Aiming at the problem that the coupling ground wire alone cannot improve the lightning resistance level of its direct strike line and the coupling ground wire segmentation causes the line lightning resistance level to decrease,the author proposes a 10 kV overhead line lightning protection method using coupled ground wire and MOA together.Using ATP-EMTP to build a 10 kV overhead line model,the energy threshold allowed by MOA is considered.The results show that MOA is on the highest phase and one side phase of the 10 kV overhead line vulnerable to lightning strikes,and when installed on the left and right bases.Under the resistance reduction measures of the tower,it still has the best direct lightning protection effect.When used in conjunction with the coupled ground wire,it can comprehensively improve the lightning resistance level of the line and has better technical and economic performance.In the two lightning strike forms of lightning pole tower and induced lightning,when the coupled ground wire is separated by 3 bases and within the tower,it is recommended to install MOA at the highest phase and one side of the stepwise pole tower at the segment interval(including 2 ends);When the coupled ground wire is separated by more than 3 bases of towers,it is recommended to install MOA at the step-by-step three-phase towers at the sectional interval(including 2 ends),which can effectively solve the problem of the lightning resistance level drop caused by the coupled ground wire.The results obtained provide a reference for the comprehensive application of lightning protection methods for 10 kV overhead lines.
作者
王延夫
汤昕
蒋凌峰
吴文锋
胡嘉宴
杨鑫
WANG Yanfu;TANG Xin;JIANG Lingfeng;WU Wenfeng;HU Jiayan;YANG Xin(State Grid Xiangtan Power Supply Company,Xiangtan 411100,China;Changsha Electric Power Technical College,Changsha 410131,China;College of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China)
出处
《电瓷避雷器》
CAS
北大核心
2023年第5期18-27,共10页
Insulators and Surge Arresters
基金
国家自然科学基金面上项目(编号:52177015)
湖南省教育厅科学研究项目(编号:19C0007和20C0004)。
关键词
氧化锌避雷器
耦合地线
10
kV架空线路
配电网
耐雷水平
zinc oxide arrester
coupling ground wire
10 kV overhead line
distribution network
lightning withstand level
