摘要
近年来,输电线路上大量采用线路避雷器进行防雷保护并取得了良好的效果。由于线路避雷器成本较高无法全线安装,需要根据防雷保护理论及运行经验制定选点安装方案。然而由于同塔多回输电线路所处大气、地貌环境千差万别、杆塔构造的多样性,以及全高超过40 m的杆塔在雷击过程中波过程本身复杂性,常规分析方法往往难以对安装方案及运行效果进行直观的评估和总结.避雷器本身免维护特点也往往导致避雷器质量问题难以及时发现,在落雷过程中发生故障才得以体现,这也增加了防雷问题分析的复杂性。雷电观测数据表明雷电流幅值及其出现概率具有一定的对应关系,幅值较高的雷电流对设备绝缘威胁更高,但本身出现概率较低,进行防雷设计时需要对安全性及经济性进行综合考虑,因此有必要借助仿真计算方法,结合实际避雷器防雷失败导致线路跳闸案例,对同塔多回杆塔的线路避雷器保护特性进行深入研究,得出雷击过程中暂态电流幅值及其分布规律;对避雷器吸收能量等情况进行量化评估,及时总结故障原因,不断提高系统运行可靠性。
In order to improve the lightning protection level of the line,a large number of line arresters are used on the transmission line for lightning protection in recent years.Due to the high cost of line arresters,they can’t be installed in the whole line.Therefore,it is necessary to make a point selection and installation scheme according to the lightning protection theory and operation experience.However,because of the complexity of the atmospheric environment,the geomorphological characteristics of the transmission line and the diversity of the tower structure,the complexity of the wave process itself during the lightning strike for a tower with a full height more than 40 m,conventional methods are difficult to visually evaluate and summarize the installation plans and operational effects.The maintenance-free feature of the arrester itself makes it difficult to detect the quality of the arrester in time,and leads to the occurrence of lightning protection failure cases,which increases the complexity of lightning protection analysis.Lightning observation data show that the amplitude of lightning current and its probability of occurrence have a certain correspondence.The lightning current with higher amplitude has higher threat to insulation of equipment,but its probability of occurrence is lower,so it needs to be considered comprehensively of safety and economy when designing lightning protection.Therefore,it is necessary to use the simulation calculation method,combined with the actual lightning arrester lightning protection failure case,to conduct in-depth research on the line arrester protection characteristics,find the transient current amplitude and its distribution law,and quantify the energy collected by the arrester,so as to summarize the reason of the fault in time and continuously improve the reliability of the line operation.
作者
曹娜
李妍
安春晖
CAO Na;LI Yan;AN Chunhui(School of Science,Inner Mongolia Agricultural University,Hohhot 010019,China;School of Economics,Inner Mongolia University of Finance and Economics,Hohhot 010019,China;Inner Mongolia Eastern Electric Power Co.,Ltd.,Zhalaite Electric Power Bureau,Zhalaite 137600,China)
出处
《电瓷避雷器》
CAS
北大核心
2020年第4期107-113,共7页
Insulators and Surge Arresters
