输电线路雷击闪络分析中杆塔模型的研究  

Research on Transmission Tower Models for Lightning Flashover Analysis

作　　者：黄文武 肖明杰[2] 杨旭[3] 王玮 姚森敬 鲁海亮[3] 文习山[3] 

机构地区：[1]深圳供电局有限公司,广东深圳518020 [2]中南电力设计院,武汉430071 [3]武汉大学电气工程学院,武汉430072

出　　处：《高压电器》2015年第6期166-172,共7页High Voltage Apparatus

摘　　要：为更方便地计算输电杆塔各横担的电位以评估多回高塔的耐雷性能,建立了改进单波阻抗模型。基于电磁暂态计算程序,将新杆塔模型与传统的集中电感模型、单一波阻抗模型和多波阻抗模型对比,分析4种模型下塔身垂直方向上电位分布。采用反推法,由Hara多波阻抗模型推导出110、220、500 k V 3种电压等级下常见双回同塔和四回同塔高塔改进单波阻抗的推荐取值。研究结果表明,改进单波阻抗模型下的杆塔塔身电位分布与多波阻抗模型最为接近,在进行整条输电线路或者多基杆塔的防雷特性评估工作时,用改进单波阻抗模型代替多波阻抗模型,可以极大地减小计算量,实用性更强。In simulating lightning flashover process, tower model has a great influence on the electric potential distribution of a tower body. In this study, to more effectively calculate the lightning protection performance of an ultra-high voltage（UHV） transmission line, an improved single impedance tower model is constructed, which is composed of many single surge impedances with different lengths. The improved single impedance model is compared with the traditional lumped inductance model, the single wave impedance model, and the multi-wave impedance model to obtain their different characteristics and applications. The recommended values of the improved single impedance model for the multi-circuit transmission line on one tower are derived at the voltage grades of 110, 220,500 kV. It is shown that the electric potential distribution on a tower body calculated with the improved single impedance model is more close to that calculated with the multi-wave impedance model, and the improved single impedance model can largely reduce the amount of computation with satisfactory accuracy. Therefore, the improved single impedance model can replace the multi-wave impedance model for lightning flashover analysis.

关 键 词：杆塔模型 多波阻抗模型 改进单波阻抗模型 杆塔电位 同塔多回 

分 类 号：TM863[电气工程—高电压与绝缘技术]