220kV重冰区双回输电线路脱冰跳跃研究

发布时间：2018-05-17 21:51

本文选题：重冰区 + 有限元法　；参考：《华北电力大学》2017年硕士论文

【摘要】：西部地区恶劣的自然环境,尤其是重覆冰、高海拔地区的恶劣环境使得走廊资源问题更加突出。目前重冰区低电压等级线路均采用单回走线,早期建设的线路耗费了大量的走廊资源,给后期的线路建设带来极大的技术难度和高昂的工程造价,重覆冰地区低电压等级线路迫切需要采用双回路设计。综上所述,开展重覆冰、高海拔地区220kV同塔双回交流输电线路脱冰跳跃研究,将为今后我国重冰区线路设计开拓新的思路,提供技术支撑,能极大地降低建设成本,具有显著的经济效益。本文采用有限元方法研究线路脱冰,通过解析法完成导地线找形,采用改变密度法模拟导线脱冰,分别建立绝缘子-导线模型和塔线体系模型并验证其准确性。考虑脱冰率及风两种参数,对6种工况下导线脱冰跳跃进行研究,对比分析结果,并结合线路实际情况,最终确定采用塔线体系模型进行导线脱冰跳越研究。确定研究模型为塔线体系模型后,采用控制变量法,分别研究脱冰率、耐张段档数、覆冰厚度、绝缘子型号及长度、高差及档距等不同参数对导线脱冰动力响应的影响。结果表明,随着脱冰率或覆冰厚度或绝缘子长度的增加,导线冰跳高度均增大;除去1档工况,耐张段档数对导线冰跳高度基本没有影响;高差对导线冰跳高度同样没有影响,因此线路设计时可忽略其影响;V串相对I串来说,在一定程度上限制导线脱冰跳跃,而其限制导线水平位移方面作用明显;随着档距的增加,导线的冰跳高度先增大后减小。
[Abstract]:The harsh natural environment, especially the heavy ice, in the western region, and the bad environment in the high altitude area make the corridor resource problem more prominent. At present, the low voltage grade lines in heavy ice regions all use single circuit lines, and the early construction lines consume a lot of corridor resources, which brings great technical difficulties and high engineering cost to the later stage of line construction. Dual circuit design is urgently needed for low voltage grade lines in reicing areas. To sum up, the research on deicing and jumping of 220kV double-circuit AC transmission lines with the same tower in high altitude area will open up new ideas for the design of heavy ice transmission lines in China, provide technical support, and greatly reduce the construction cost. It has remarkable economic benefit. In this paper, the deicing of the lines is studied by finite element method, the shape finding of the ground wire is completed by analytical method, and the deicing of conductors is simulated by changing density method. The insulator-conductor model and the tower system model are established respectively and their accuracy is verified. Considering the two parameters of deicing rate and wind, this paper studies the traverse deicing jump under six working conditions. The results are compared and analyzed. Finally, the tower line system model is adopted to study the traverse deicing jump in the light of the actual situation of the line. After determining the model as the model of tower system, the influence of different parameters, such as deicing rate, number of stretch sections, icing thickness, insulator type and length, height difference and distance, on the dynamic response of conductor deicing were studied by using control variable method. The results show that with the increase of deicing rate, ice thickness or insulator length, the height of conductor ice jump increases, except for the first stage, the number of stretch sections has no effect on the height of ice jump, and the height difference has no effect on the height of ice jump. Therefore, the influence of V string relative to I string can be neglected in line design, which limits the traverse deicing jump to a certain extent, but its effect on limiting the horizontal displacement of traverse is obvious, and the height of ice jump increases first and then decreases with the increase of distance.
【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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