Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN2097-6623

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带电更换特高压线路耐张绝缘子串工法

来源:电工电气发布时间:2026-05-28 13:28 浏览次数:271

带电更换特高压线路耐张绝缘子串工法

宋恒东,韩学春,张子阳,陈语涵
(国网江苏省电力有限公司超高压分公司,江苏 南京 211102)

    摘 要 :针对特高压输电线路耐张绝缘子串在出现多片低值、零值绝缘子或机械性能整体下降时,传统单片更换方法效率低下、作业风险高,且缺乏有效整串更换工法的问题,提出了一种“内外双拉”式带电更换新工法。该工法通过研制 140 kN 级钛合金主卡具、辅助工具及绝缘滑车组放串系统,构建了一套完整的载荷转移与绝缘子串更换方案,实现了在不停电条件下对整串绝缘子的高效、安全更换。在江苏电网某 ±800 kV 特高压线路上的现场应用表明,该工法将整串更换时间缩短至 4 h,相比传统整串单片更换方法作业时间缩短 55.6%,工具装拆次数减少 90.9%,降低了安全风险,为特高压输电线路的智能运检与安全稳定运行提供了强有力的技术支撑。
    关键词 : 输电线路 ;带电更换 ;整串更换 ;内外双拉法 ;耐张绝缘子串
    中图分类号 :TM216     文献标识码 :B     文章编号 :2097-6623(2026)05-0062-06


Live-Line Replacement Method for Tension Insulator
Strings on UHV Transmission Lines


SONG Heng-dong, HAN Xue-chun, ZHANG Zi-yang, CHEN Yu-han
( State Grid Jiangsu Electric Power Co., Ltd. Extra-High Voltage Branch Company, Nanjing 211102, China)
 

    Abstract: To address the problem that, when tension insulator strings on UHV transmission lines develop multiple low-value, zero-value insulators or overall decline in mechanical performance, the conventional single-piece replacement method is inefficient, poses high operational risk, and lacks an effective whole-string replacement method, a new live-line replacement method of the “internal-external double-tension” type is proposed. By developing a 140 kN-class titanium alloy main clamp, auxiliary tools, and an insulated pulley block string lowering system, this method establishes a complete load transfer and insulator string replacement scheme, achieving efficient and safe replacement of the whole-string insulator under live-line conditions. Field application on a ±800 kV UHV transmission line in the Jiangsu Power Grid shows that this method reduces the whole-string replacement time to 4 h—a 55.6% reduction in operation time compared with the conventional whole-string single-piece replacement method—and the number of tool assembly-disassembly cycles is reduced by 90.9%,thereby lowering safety risks and providing strong technical support for the intelligent operation and safe and stable operation of UHV transmission lines.
    Key words: transmission line; live-line replacement; whole-string replacement; internal-external double-tension method; tension insulator string
 

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