混压同塔多回输电线路绕击建模与评估  

Modeling and Evaluation of Shielding Failure for Multi-Circuit Transmission Lines in Different Voltage Levels on the Same Tower

作　　者：廖民传[1] 汪晶毅[1] 李志泰[1] 潘春平[1] 

机构地区：[1]中国能源建设集团广东省电力设计研究院,广东省广州市510663

出　　处：《电网技术》2013年第9期2547-2552,共6页Power System Technology

摘　　要：建立准确合理的绕击模型以评估混压同塔多回输电线路防雷性能,进而优化杆塔结构、配置绝缘和线路设计,对提高共塔多回输电通道安全性具有重要的意义。基于电气几何原理计算绕击率,考虑多层导线与地线的相互屏蔽效应和工作电压对击距的影响,并计及雷电入射角、地面倾角、弧垂变化多项因素;基于EMTP计算绕击耐雷水平,对杆塔采用多波阻抗模型,对线路采用J.Mart模型,并使用双指数波和先导发展法对雷电流及闪络过程进行模拟,由此综合建立了混压同塔多回路绕击计算模型。最后对一种新型混压同塔六回路绕击性能进行计算和评估,给出了相应的建议。To build reasonable and accurate shielding failure model is of significance for enhancing the security of multi circuit transmission lines on the same tower, and then for the optimization of transmission tower structure, insulation configuration and transmission line design. Based on electro-geometric model and considering mutual screening effects among overhead ground wires and multi-layers of conductors and the influence of operating voltages on striking distance as well as such factors as incident angle of lightning, ground obliquity and variation of conductor sags, the line lightning resisting level for shielding failure is computed by EMTP, in the simulation the multi-wave impedance model is applied to transmission tower, the J. Mart model to transmission lines; to simulate lightning current and flashover process, the double exponential waveform and leader propagation method are utilized, thus a comprehensive model to calculate shielding failure of multi-circuit transmission lines in different voltage levels on the same tower is built. Finally, the calculation and evaluation of anti-shielding failure performance for a new type of six-circuit transmission line in different voltage levels on the same tower are performed, and corresponding suggestions are given.

关 键 词：同塔多回路 防雷保护 绕击 电气几何模型 电 磁暂态计算 

分 类 号：TM86[电气工程—高电压与绝缘技术]