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特高压线路覆冰脱落跳跃的动力计算研究
引用本文:侯镭,王黎明,朱普轩,关志成.特高压线路覆冰脱落跳跃的动力计算研究[J].中国电机工程学报,2008,28(6):1-6.
作者姓名:侯镭  王黎明  朱普轩  关志成
作者单位:1. 清华大学深圳研究生院,广东省,深圳市,518055
2. 甘肃省电力设计院,甘肃省,兰州市,730050
摘    要:导线脱冰是冰区输电线路中的常见现象,导线脱冰会引起导线的剧烈运动,使导线跳跃上下摆动,导线跳跃将导致导线档中空气间隙的减小,严重时以致相间闪络;同时脱冰跳跃还会对绝缘子串、金具及铁塔产生较大的动态拉力,对其产生破坏作用,在重冰区大档距的情况下,导线脱冰的影响尤为显著。特高压线路由于导线分裂根数较多,截面较大,其脱冰跳跃问题更为严重,特高压脱冰跳跃的考虑对于导线排列,铁塔选型,档距配置等都有重要意义。本文首先分析了导线脱冰时的非线性的非线性动力过程,建立了适用于导线脱冰跳跃分析的3自由度多档导线模型,确定了采用中心差分的显式积分方法作为计算方法。计算得到了导线脱冰跳跃的时程响应,并分析了脱冰量(百分比)、档距组合、导线机械参数、均匀与非均匀脱冰等因素的影响。

关 键 词:架空输电线路  脱冰跳跃  动力响应  数值计算  特高压
文章编号:0258-8013(2008)06-0001-06
收稿时间:2007-03-20
修稿时间:2007年3月20日

Dynamic Behavior Computation of Ice Shedding of UHV Overhead Transmission Lines
HOU Lei,WANG Li-ming,ZHU Pu-xuan,GUAN Zhi-cheng.Dynamic Behavior Computation of Ice Shedding of UHV Overhead Transmission Lines[J].Proceedings of the CSEE,2008,28(6):1-6.
Authors:HOU Lei  WANG Li-ming  ZHU Pu-xuan  GUAN Zhi-cheng
Abstract:Ice-shedding from conductors is a familiar phenomenon on overhead transmission line in iced area. Ice-shedding will cause the violent oscillation of the lines, and make the conductors jumping up and down. The jumping of the conductors reduces the phase-to-phase clearance, even leads to interphase flashover. The Ice-shedding also applies a large dynamic load on the insulator strings, fittings and towers, and brings destructive impact on them. In over iced areas and long-span cases, the effects of ice-shedding are especially significant. In UHV lines, because the quantity of bundled conductors and the section area of conductor are bigger, the ice-shedding problem is more serious. The consideration of the ice-shedding problems is very important in determining the alignment of the conductors, the type of towers and the configurations of spans. In this paper, the non-linear dynamic process of ice-shedding is analyzed first. Then a 3DOF dynamic model of multi-span line suitable for analyzing ice-shedding is presented. Explicit central difference integral is adopted as the computation method. The time responses of the ice-shedding are acquired. The influencing factors including percentage of ice-shedding, multi-span configuration, mechanical parameters of conductor, uniform and nonuniform mode ice-shedding are studied.
Keywords:overhead transmission line  ice-shedding  dynamic response  numerical computation  ultra high voltage
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