特高压直流同塔混压输电线路反击耐雷性能计算方法研究  

Research on Calculations for Lightning Performance of Back-Flashover for Double-Circuit UHV DC Transmission Line with Dual Voltage 800 kV/500 kV on the Same Tower

作　　者：李金亮[1] 杜志叶[1] 阮江军[1] 张亚飞[1] 李健[2] 陈媛[2] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]中南电力设计院,武汉430071

出　　处：《电瓷避雷器》2015年第2期87-93,共7页Insulators and Surge Arresters

摘　　要：绝缘子串的绝缘闪络判据是线路耐雷水平计算中的关键因素,本文基于EMTPATP软件,提出了模拟绝缘子闪络过程的先导发展反击闪络模型,通过算例进行了分析验证,研究了3种闪络模型对特高压直流同塔混压输电线路反击耐雷水平的影响,比较了3种方法的特点。在以相交法作为绝缘闪络判据时,选取两种典型的800 k V伏秒特性曲线进行耐雷水平计算,计算结果一致。通过对线路架设参数变化进行了仿真分析,并提出了相应的防雷建议。研究结果表明:500 k V线路是特高压直流同塔混压双回线路的反击薄弱所在,需进行重点防护;与相交法相比,特高压直流同塔混压线路反击耐雷水平研究推荐采用先导发展法模拟绝缘子闪络。The criterion of insulation flashover is the key factor for the line lightning resisting level calculation, the leader development back flashovers model which simulating the insulator flashover process is proposed based on EMTP-ATP software. It is analyzed and verified through an example, the impacts of three flashover models on back flashovers lightning withstand level were researched and characteristics of different calculation methods were compared. Two typical kinds of 800 kV volt-time eurves were used for the ealeulation of lighting withstand level when the intersection method was used as the flashover criterion, and the results are consistent. Meanwhile, through the simulated analysis on the changes of line construction parameters, the corresponding lightning protection measures were proposed. Results of the research show that the weak points of the lightning protection for a double- circuit DC transmission line with dual voltage 800 kV/500 kV on the same tower is the insulation of 500kV transmission lines, and it should be mainly protected. Comparing with the intersection method, the leader propagation method is recommended for simulating the insulator flashover in the research on back flashovers lightning performance for double-circuit UHV DC transmission line with dual voltage 800 kV/500 kV on the same tower.

关 键 词：直流输电 反击 耐雷性能 闪络判据 伏秒特性 同塔混压 

分 类 号：TM863[电气工程—高电压与绝缘技术]