同塔多回输电线路几种防雷击跳闸措施的评估

相比于单回线路,同塔线路容易遭受雷电绕击和反击,严重威胁电网安全。评估同塔多回输电线路几种防雷击跳闸措施,包括降低杆塔接地电阻、加强线路绝缘水平、架设耦合地线和加装线路避雷器等,并提出上述防雷措施的配置原则:采取降阻措施改善接地,采用不平衡高绝缘方式,将耦合地线架设在塔顶,以及根据线路雷击跳闸的具体情况和线路杆塔特点选择性地安装线路避雷器。

The Evaluation of Several Counter Measures for Lightning Tripout of Multi-circuit Transmission Lines at the Same Tower

In comparison with the single-circuit line, multi-circuit lines are liable to encounter lightning back strike and shielding failure strike so to threat the security of power networks. This paper evaluates several measures of preventing lightning trip of multi-circuit lines, including to reduce tower grounding resistance, to strengthen the line insulation level, to span the coupling ground wire as well as to install line arresters, and proposes the configuration principle of these measures: to reduce resistance to improve the grounding effect, to adopt high-insulation imbalance mode, to set up coupling ground wire at the top of towers , and to selectively install line arresters according to the specific circumstances of the lightning trip and line towers features.