摘要
对韶关供电局一回35 kV架空输电线路近三年的雷击故障进行统计分析。从落雷数据、杆塔反击耐雷水平计算等方面综合诊断故障原因,得出结论:复合绝缘子串的雷电冲击50%干闪络电压较低,叠加线路途经雷电活动频繁地区、跨越桉树林的杆塔采用了高跨设计的因素,造成线路耐雷水平无法达到规定要求,是故障频繁的主要原因。针对该类问题,在设计、运维、改造方面提出了建议。
The lightning strike fault of a 35 kV overhead transmission line in Shaoguan Power Supply Bureau in the past three years are statistically analyzed.From the aspects of lightning falling data and tower counterattack lightning level calculation,the fault cause is comprehensively diagnosed,and it is concluded that the lightning impact 50%dry flashover voltage of the composite insulator string is low.The high-span design factor of the pole tower superimposed on the line passing through areas with frequent lightning activity and crossing eucalyptus forests causes the lightning resistance level of the line to not meet the specified requirements,which is the main reason for frequent failures.In view of such problems,suggestions are put forward in design,operation and maintenance,and transformation.
作者
王梓宁
WANG Zining(Shaoguan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Shaoguan 512000,China)
出处
《电工技术》
2023年第15期203-205,210,共4页
Electric Engineering
关键词
架空输电线路
雷击
耐雷水平
overhead transmission line
lightning stroke
lightning protection level
