特高压输电线路舞动及防舞措施研究

发布时间：2018-10-05 20:57

【摘要】：舞动是不均匀覆冰导线在风的作用下产生的一种低频率(约为0.1~3Hz)、大振幅(约为导线直径的5~300倍)的自激振动。目前我国正处于特高压电网的快速发展时期,同时,电网规模的快速发展和恶劣天气的频繁出现,致使输电线路发生舞动的频率和危害程度都呈现明显增加的趋势,轻则引起导线鞭击、烧伤、断股等,重则会造成断线倒塔、线路跳闸,导致大面积停电事故,给社会带来重大经济损失。本文从试验和仿真两个方面入手,围绕“特高压输电线路舞动及防舞措施研究”这一主题,开展了如下研究:通过在八分裂试验线路上安装模拟冰,利用自然风对线路进行舞动激励,使真型特高压八分裂导线起舞,并对线路的舞动特性进行了观测分析;针对新型防舞措施-相地间隔棒在试验线路上进行了试验研究,验证了其抑制舞动的有效性和适用性,并对比不同预紧力、不同安装方式的工况下相地间隔棒的防舞效果,解决如何才能使其发挥更好防舞作用的问题;利用现有有限元分析软件,结合实际参数和工况,对耐张段内的导线及相地间隔棒进行了仿真计算,模拟了舞动的形态,研究了相地间隔棒安装前后线路的舞动特性,对比分析了不同工况下的防舞效果;把试验与仿真结合起来,对防舞装置能否有效抑制舞动、如何能够更好的抑制舞动的问题进行了综合的评价。
[Abstract]:Galloping is a kind of self-excited vibration with low frequency (about 0.1~3Hz) and large amplitude (about 5 ~ 300 times of wire diameter) produced by uneven ice conductor under the action of wind. At present, our country is in the period of rapid development of UHV power grid. At the same time, with the rapid development of power grid scale and the frequent occurrence of bad weather, the frequency and harm degree of transmission line galloping are obviously increasing. Light will cause wire whipping, burn, broken strands and so on, heavy will cause broken tower, line tripping, leading to a large area of power failure, and bring great economic losses to the society. Based on the subject of "study on dance and anti-dance measures for UHV transmission lines", the following researches are carried out in this paper: by installing simulated ice on the eight-splitting test lines, In this paper, the natural wind is used to dance the lines to make the true UHV eight split conductors dance, and the galloping characteristics of the lines are observed and analyzed, and the experimental study is carried out on the test lines for a new type of anti-dance measure, the phase-ground spacer. Verify the effectiveness and applicability of its dance suppression, and compare the anti-dance effects of phase spacers under different pre-tightening forces and different installation modes, and solve the problem of how to make them play a better role in dance prevention; Using the existing finite element analysis software, combining with the actual parameters and working conditions, the wire and phase spacer in the tensile section are simulated and calculated, the shape of the galloping is simulated, and the galloping characteristics of the lines before and after the installation of the phase spacers are studied. This paper compares and analyzes the effect of dance prevention under different working conditions, and synthetically evaluates whether the anti-dance device can restrain the dance effectively and how to restrain the dance better by combining the test and simulation.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM752

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