雷击特高压直流杆塔暂态特性分析  

Research of Transient Characteristic of Lightning Strikes UHVDC Towers

作　　者：徐闻[1] 李荷薇 李国毅[1] 

机构地区：[1]西华大学,成都610039

出　　处：《电气技术》2015年第1期44-47,共4页Electrical Engineering

摘　　要：雷击杆塔时的暂态特性分析对于输电线路防雷设计有十分重要的意义,本文以±800k V直流输电线路为例,利用EMTP暂态仿真软件建立高杆塔的连续多波阻抗模型以及基于杆塔主体的细化分模型,构建了直流输电线路的简化模型,分析了雷电流幅值以及雷电波陡度对塔顶电位和绝缘的影响并计算了反击耐雷水平。结果表明,杆塔分段更细时塔顶过电压幅值更低,雷电流波的陡度与高杆塔的防雷密切相关。雷击杆塔时,正极导线绝缘子串两端的电压始终高于负极导线绝缘子串的电压,正负两级导线的绝缘表现为不平衡绝缘,直流工作电压的影响不可忽略。Analysis of transient characteristic of lightning strikes transmission line towers is of great significance to the lightning protection design. This paper takes ±800kV DC transmission line as an example, using EMTP transient simulation software to establish continuous multi-wave impedance model of high towers and Tower-based refining model, building the simplified model of the dc transmission line, analyzing the effects of Lightning current amplitude and Lightning wave steepness on top potential and insulation then calculating the level of against lightning. The results show that the finer tower segment the tower over-voltage amplitude is lower than lossless transmission line model, lightning current wave steepness is closely related to the lightning protection of high tower. When the tower struck by lightning, the voltage at both ends of positive wire insulator strings always higher than that of the anode wire insulator strings,the insulation performance of positive and negative two-tier wire is unbalanced insulation, the influence of the dc voltage can not be neglected.

关 键 词：±800k V输电线路 连续多波阻抗模型 反击耐雷水平 

分 类 号：TM863[电气工程—高电压与绝缘技术]