摘要
采用ATP-EMTP软件建立仿真模型,对220kV同塔四回输电线路反击耐雷性能进行了仿真计算和分析。分析了雷击杆塔塔顶时,杆塔塔身及各横担不同部位电位分布,并讨论了杆塔高度、杆塔冲击接地电阻、土壤电阻率、绝缘水平等因素对线路反击耐雷性能的影响。结果表明:低土壤电阻率地区杆塔接地电阻对线路反击耐雷性能影响不明显,高土壤电阻率地区降低杆塔接地电阻能够提高线路耐雷水平;需要根据实际条件尽可能地降低杆塔高度;线路各层导线可以采取不同的绝缘水平。
The electromagnetic transient program （ATP-EMTP） is used to establish an simulation model for analyzing the lightning performance of back flashover of 220 kV transmission lines with quadruple-circuit on single tower.The potential distribution in tower body and cross arms is presented by EMTP when lightning strikes the tower top.The influence of some factors,such as the tower height,impulse grounding resistance,soil resistivity and insulation level,on the lightning performance of back-flashover of transmission lines,are analyzed.The result shows that the grounding resistance of towers in low soil resistivity area has no obvious effects on the lightning performance of transmission lines,but the lightning performance of transmission lines can be improved by reducing the grounding resistance of towers in the area of high soil resistivity.The tower height should be lowered as far as possible according to the actual conditions,and different insulation levels can be adopted for various layers of conductors.
出处
《电力建设》
2010年第9期55-59,共5页
Electric Power Construction
关键词
同塔四回输电线路
反击耐雷性能
耐雷水平
跳闸率
ATP-EMTP
影响因素
杆塔高度
transmission line with quadruple-circuit on single tower
back flashover performance
lightning withstand level
lightning trip
ATP-EMTP
influencing factors
transmission tower height
