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。导线跳跃将导致导地线间或导线档中空气间隙的减小,严重时引起闪络;此外导线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。采用悬挂集中载荷的方法来模拟导线覆冰,研究不同档距组合、不同脱冰方式下的导线脱冰跳跃,获得了导线脱冰时的动态位移和动态张力变化规律。同时,还通过计算机仿真的方法针对试验工况进行数值模拟,并比较试验结果和计算结果。结果表明,仿真计算与模拟试验的结果具有相同的规律性和相近的数值。
Ice-shedding occurs frequently on overhead transmission line in ice area, causing vibration on the line and making it jump up and down violently. The jumping of the conductors may reduce the phase-to-earth or phase-to-phase clearance, from which flashover can happen under severe conditions; On the other hand, it is likely to apply high dynamic stresses on the insulator strings, fittings and towers, and cause damage to them. In heavy icing areas and long-span cases, the effects of ice-shedding are especially significant. In this paper, a simulation experiment was carried out to acquire the actual dynamic responses of the line displacement and tension, in which the natural ice covered line was simulated by lumped loads hanging on the line, and various span configurations as well as ice-shedding mode were taken into consideration. Furthermore, numerical computation is done according to the test conditions. Good agreement between the computational and test results is obtained which proves the validity of both the test and numerical methods.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第28期115-121,共7页
Proceedings of the CSEE
关键词
覆冰导线
脱冰跳跃
模拟试验
仿真计算
icing conductor
ice shedding
simulation experiment
numerical computation
