绝缘配置优化的研究  

Study of Optimized Insulation Arrangement

作　　者：应伟国[1] 危鹏[2] 

机构地区：[1]金华电业局,浙江金华321017 [2]国家绝缘子避雷器质量监督检验中心,西安710077

出　　处：《电瓷避雷器》2007年第6期4-8,共5页Insulators and Surge Arresters

摘　　要：采用通常的塔头绝缘配置设计,线路沿绝缘子串闪络跳闸与由塔头空气间隙击穿放电的跳闸比为10:1～12:1,造成输电线路的故障率占全部输变电设备故障的80%左右;同时也限制了环境污染严重情况下需要增加外绝缘配置而加大绝缘子串长的可能。按空气间隙击穿电压与绝缘子串闪络电压配合比约为0.7的设计原则进行塔头绝缘配置,并推荐采用"V"形串替代"I"形串方式构成紧凑型线路。结果表明,既节约了线路走廊资源,又提高了输电线路的绝缘水平,可大幅度减少线路沿绝缘子串闪络事故;将外绝缘耐污等级提高到3.5cm/kV以上;可基本免除绝缘子串的清扫工作,大大降低了线路的运行维护成本。The tripping rate of flashover along insulator string and across air gap on tower head constitutes 10：1-12：l using normal insulation arrangement, which leads to flashover rate of overhead line making up 80% of total flashover amount of transmission and distribution facilities. Meanwhile the feasibility of increasing insulator string length for strengthening the external insulation arrangement due to severe pollution is restricted. It is proposed to arrange the tower head insulation based on coordination ratio 0.7 between flashover voltage of air gap and along the insulator string. The result shows that a compact line configuration using ＂V＂ type insulator string instead of ＂I＂ type one can economize the right-of-way for transmission lines, enhance their insulation level and considerably decrease the flashover rate along insulator strings. Application of highest pollution severity lever for line external insulation up to 3.5 cm / kV and above can basically exempt cleaning work on insulator strings and thus considerably line maintenance cost.

关 键 词：塔头绝缘配合 绝缘子故障 “I”形串 “V”形串 零值检测 

分 类 号：TM854[电气工程—高电压与绝缘技术]