500kV线路绝缘子串并联间隙雷电冲击放电特性及其结构优化  

Lightning Impulse Discharge Characteristics and Structure Optimization of Insulator Strings with Parallel Gaps for 500 kV Transmission Line

作　　者：姜文东[1] 王剑[2] 张彩友[1] 谷山强[3] 彭波[2] 苏杰[3] 

机构地区：[1]国网浙江省电力公司,杭州310007 [2]国家电网公司,北京100031 [3]国网电力科学研究院武汉南瑞有限责任公司,武汉430074

出　　处：《高电压技术》2016年第12期3788-3796,共9页High Voltage Engineering

基　　金：国家电网公司科技项目(5211JH1500X7)~~

摘　　要：为提高500 k V线路绝缘子串并联间隙防雷的科学有效性,试制了500 k V线路5组不同结构参数绝缘子串并联间隙试品,在国网特高压交流试验基地对5组并联间隙试品的雷电冲击50%放电电压、伏秒特性及并联间隙疏导电弧有效性进行了研究,并分析了5组并联间隙试品电极和绝缘子串两端护套表面电场强度的最大值。结果表明:5组并联间隙试品雷电冲击50%放电电压及伏秒特性均能与绝缘子串形成良好绝缘配合;当绝缘子串高压、低压端并联间隙电极端部距绝缘子串中心线的横向伸出长度均为700 mm时,间隙雷电冲击失效起始电压最高,有效接闪导弧性能最好;五组绝缘子串并联间隙试品电极表面电场最大值均<26 k V/cm,绝缘子串两端护套表面电场最大值均<6 k V/cm,满足相关规程要求。因此,推荐500 k V线路绝缘子串高压、低压端并联间隙横向伸出长度均为700 mm为其优化的结构参数。In order to improve the scientificalness and effectiveness of parallel gaps lightning protection for 500 kV trans- mission line, five kinds of profiles of parallel gaps with different structure parameters were manufactured, and lightning impulse 50% discharge voltage, volt-time characteristics, and electric arc dispelling effectiveness of these profiles were re- searched in UHV AC Test Base of SGCC, moreover, their maximum surface electric fields of electrodes and two-temu＇nal jacketed insulator were analyzed. The results show that all of the parallel gaps have good insulation coordination with insula- tors on lightrting impulse 50% discharge voltage and volt-time characteristics, while the lateral separation from high- and low- voltage terminals to the central line of insulator is both 700 mm, and its lightning impulse initial failure voltage of par- allel gaps is the highest, indicating best lightning pick-up performance. The maximum electrodes surface electric fields of 5 profiles are all under 26 kV/cm, and the maximum surface electric fields of two-terminal jacketed insulator are all under 6 kV/cm, meeting the requirements of relative regulations. So, the optimized parallel gap whose lateral separations from high- and low- voltage terminals to the central line of insulator are both 700 mm is recommended.

关 键 词：绝缘子串 并联间隙 雷电冲击 电弧 伏秒特性 失效概率 

分 类 号：TM216[一般工业技术—材料科学与工程] TM75[电气工程—电工理论与新技术]