降低同塔双回输电线路同跳概率应对措施  

Measures to Reduce the Probability of Same-hop Double-circuit Transmission Lines on The Same Tower

作　　者：魏志雄 杨柳辉 Wei Zhi-xiong;Yang Liu-hui

机构地区：[1]广东电网有限责任公司河源供电局,广东河源517000

出　　处：《电力系统装备》2020年第8期26-27,共2页Electric Power System Equipment

摘　　要：同塔双回输电线路逐步成为电网线路规划主流,线路遭受雷击同跳后重合成功率低,易引起变电站失压,可能造成大面积停电或较大的经济损失,需采取防护措施来降低线路同跳概率,提升电网供电可靠性.文章在分析当前线路雷害基本防护措施的基础上,提出了以疏导型及转移型为主的防雷措施,对比分析不平衡高绝缘、不平衡低绝缘及平衡高绝缘的防同跳耐雷水平,明确了不平衡绝缘配置策略;最后分析了接地网散流机理,从冲击接地电阻特性以及土壤电离现象为切入点,指出地网改造思路,有效泄导雷电冲击电流,降低横担处绝缘子两端电位差,提升线路同跳耐雷水平.Double-circuit transmission lines on the same tower have gradually become the mainstream of power grid line planning.After the line is hit by lightning,the resynthesized power is low,which can easily cause substation voltage loss,which may cause largescale power outages or large economic losses.Protective measures are required to take Reduce the probability of line hopping,and improve the reliability of power supply.Based on the analysis of the basic protection measures for the current line lightning damage,lightning protection measures mainly based on the conductive type and the transfer type are proposed.The comparative analysis of the lightning protection level of unbalanced high insulators,unbalanced low insulation and balanced high insulation is clear.The unbalanced insulation configuration strategy.Finally,the analysis of the ground network’s divergent flow mechanism is made from the impact ground resistance characteristics and the soil ionization phenomenon as the starting point.The idea of ground network reformation is to effectively discharge the lightning impulse current,reduce the potential difference between the two ends of the insulator at the crossarm,and improve the line withstand lightning resistance.Level.

关 键 词：同塔双回线路 线路同跳 同跳耐雷水平 不平衡绝缘 接地网 

分 类 号：TM863[电气工程—高电压与绝缘技术]