750 kV输电线路扩径导线跳股原因的分析.pdfVIP

第27 卷 第9 期 电 力 建 设 Voi. 27 No. 9 ·1 · 2006 年9 月 Eiectric Power Construction Sep ，2006 ·电网技术 · 750 kV 输电线路扩径导线跳股原因的分析 毕庶达 （甘肃送变电工程公司，兰州市，730050 ） ［摘 要］ 750 kV 官兰输电线路在高海拔地区采用了LGJK - 300/ 50 扩径导线，在张力放线施工过程中，扩径导线 频频发生跳股现象。扩径导线的结构特点是其发生跳股的内在原因，即其内层铝股和邻外层铝股疏绕的空隙和对 外层铝股支持力的缺失，使导线的结构处于不稳定状态。当导线通过滑轮时，在较大的综合外力的挤压作用下，导 线就会发生跳股。建议研究单位对导线跳股进一步进行试验研究。 ［关键词］ 输电线路 扩径导线 跳股 中图分类号：TM752 文献标识码：B 文章编号：1000 - 7229（2006 ）09 - 0001 - 03 Anaiysis on Causes of Strand Jumping of Extended Diameter Conductor for 750 kV Transmission Line Bi Shuda （Gansu Transmission and Distribution Engineering Company ，Lanzhou City ，730050 ） ［Abstract ］ The LGJK - 300/ 50 extended diameter conductor is used for 750 kV Guan—Lan transmission iine iocated at the area of high eie- vation above sea ievei. During the iine stringing under tension the strand jumping occurred freguentiy to the extended diameter conductors. The structurai feature of the conductor is the internai reason for the strand jumping ，i. e. wound gap between its internai aiuminum strand and neigh- bor outer strand and iack of the supporting force to the outer iayer aiuminum strand ，which resuits in non - stabie state for the conductor struc- ture. As the conductor is passing through the puiiey ，it is under compression action produced by generai outer forces and the strand jumping oc- curs to the conductor at the time. The research organs are suggested to carry out a further test and research on the conductor strand jumping. ［Keywords ］ transmission iine ；extended diameter condu