杆塔接地电阻模型对反击耐雷性能影响的研究

Study on the Influence of Tower Grounding Resistance Model on Anti-thunder Performance

杆塔接地电阻是影响杆塔反击耐雷性能的最主要因素之一,准确评估杆塔接地电阻对耐雷性能的影响对于输电线路防雷设计具有重要意义。通过ATP-EMTP搭建包含杆塔、CIGRE推荐的冲击接地电阻模型、先导闪络模型等综合仿真模型,首先对冲击接地电阻变化规律及影响因素进行计算与对比分析,然后计算不同电源相角下杆塔典型耐雷水平。计算结果表明,冲击接地电阻模型下杆塔反击耐雷水平高于线性电阻模型,建议在低电阻率区域、高电压等级输电线路防雷计算时严格考虑接地电阻模型对计算结果的影响,使计算结果符合实际情况。

Tower grounding resistance is one of the most important factors that affect the lightning resistance of tower. It is very important to accurately evaluate the impact of tower grounding resistance on the lightning resistance of transmission line for lightning protection design. ATP-EMTP is used to build a comprehensive simulation model including tower, impact grounding resistance model recommended by CIGRE, pilot flashover model, etc. Firstly, the change rule and influencing factors of impact grounding resistance are calculated and compared, and then the typical lightning resistance level of tower under different power phase angles is calculated. The calculation results show that the lightning resistance level of tower under impulse grounding resistance model is higher than that of linear resistance model. It is suggested that the influence of grounding resistance model on the calculation results should be strictly considered in the calculation of lightning protection in low resistance area and high voltage transmission line, so that the calculation results conform to the actual situation.