某110kV同塔双回线路雷害事故分析及对策探讨

对韶关地区某110 kV同塔双回线路一起具体雷害事故进行了分析,得出110 kV线路耐雷水平低是造成反击事故的主要原因,而双回线路耐雷水平差值较小往往容易导致雷击同时跳闸。在理论分析和结合实际的基础上,提出了降低杆塔接地电阻、采取平衡高绝缘和架设耦合地线等措施提高线路耐雷水平和双回线路耐雷水平差值。另外,为了防止发生绕击事故,采取加装一种带有均压球的新型侧向避雷针,雷电流经均压球均压后具有较好的分散效果。理论分析表明,经过上述措施改造后,能起到较好的防雷效果。

Analysis of the Lightning Strike Accident in a Same Tower of 110 kV Double Circuit Line and Counter Measures

A specific lightning strike fault happened on a 110 kV double circuit transmission line in the Shaoguan area is analyzed,it is concluded that the main reason caused back flashover happened on 110 kV line is the low lightning withstand level,and the lightning and tripping out occurred in the same time usually caused by small difference between the lightning withstand level of double circuit line.Based on the theoretical analysis and combined the actual situation,some measures are proposed to improve the lightning withstand level and increase the difference between the lightning withstand level of double circuit line,such as reduce the grounding resistance of the tower,adopt a balanced high insulation and erection of coupling line.In addition,a new lateral rod with griding ball is used to avoid the lightning shielding failure,there is better disperse effect after lightening current crossed the griding ball.Theoretical analysis shows that these measures can receive a better lightning protection effect.