电工技术学报  2025, Vol. 40 Issue (9): 2852-2863    DOI: 10.19595/j.cnki.1000-6753.tces.240609
电工理论 |
基于遮蔽效应分析的分裂导线覆冰特性及快速计算方法
黄亚飞1, 陈阳宁1, 杨鑫1, 蒋兴良2, 范才进3
1.电网防灾减灾全国重点实验室(长沙理工大学) 长沙 410114;
2.重庆大学雪峰山能源装备安全国家野外科学观测研究站 重庆 400044;
3.直流输电技术全国重点实验室(南方电网科学研究院) 广州 510663
Icing Characteristics and Rapid Calculating Method of Bundled Conductor of Transmission Line Based on Shadowing Effect Analysis
Huang Yafei1, Chen Yangning1, Yang Xin1, Jiang Xingliang2, Fan Caijin3
1. State Key Laboratory of Disaster Prevention & Reduction for Power Grid Changsha University of Science and Technology Changsha 410114 China;
2. Xuefeng Mountain Energy Equipment Safety National Observation and Research Station of Chongqing University Chongqing 400044 China;
3. State Key Laboratory of HVDC CSG Electric Power Research Institute Guangzhou 510663 China
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摘要 冬季架空输电线路覆冰会对电力系统安全稳定运行构成重大威胁。对于分裂导线而言,由于上风侧子导线对下风侧子导线的遮蔽效应的影响,导致其覆冰特性将出现较大差异,而现有研究缺乏对分裂子导线间覆冰遮蔽效应的定量研究。针对上述问题,该文首先通过数值仿真方法对分裂导线覆冰特性进行研究。采用欧拉模型求解分裂导线覆冰过程中的气-液两相流场分布特性,基于控制体思想及水滴冻结质量平衡与热力学平衡方程,获取了不同覆冰环境下分裂导线的覆冰质量与形貌。然后通过遮蔽角与遮蔽系数的定义分析了分裂子导线间的覆冰遮蔽效应及其影响因素。结果表明:分裂导线上、下风侧子导线覆冰强度之差与子导线间遮蔽效应的强度呈正相关,遮蔽角绝对值和分裂间距的增加会导致遮蔽效应减弱乃至消失;液滴中值体积直径的增加将加剧遮蔽效应;在5~20 m/s的风速范围内,遮蔽效应先增强后减弱,风速为15 m/s时遮蔽效应最强烈。最后,基于遮蔽效应分析,提出了针对不同分裂形式分裂导线的覆冰量快速计算方法,并通过分裂导线自然环境覆冰观测试验对快速计算方法的准确性进行了验证。研究结果可为架空输电线路的防覆冰设计与运维提供理论指导。
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黄亚飞
陈阳宁
杨鑫
蒋兴良
范才进
关键词 架空输电线路覆冰分裂导线数值模拟自然覆冰试验    
Abstract:For bundled conductors, the shadowing effect of upwind sub-conductor will affect the airflow and droplets distributions of downwind one, resulting in the difference in icing characteristics. Traditional icing calculation process generally ignored these differences and, hence, only giving an identical icing mass result of each sub-conductor. This affects the study of the aerodynamic characteristics and deicing methods of icing bundled conductor. Although some scholars have pointed out that the shadowing effect between sub-conductors will influence the icing process, there is no quantitative study. Therefore, this paper further explores the shadowing effect and relevant influencing factors of bundled conductors through numerical simulation and test research. Furthermore, based on the analysis of the shadowing effect and the superposition principle, a rapid calculation method of ice mass accreted on the bundled conductor is proposed.
Firstly, the distributions of airflow and droplets around bundled conductor are solved by Eulerian-Eulerian two-phase flow model. Secondly, combined with the mass and thermodynamic balance equations, the icing mass and shape accreted on bundled conductor under various icing environments are obtained. Then a new parameter called shadowing coefficient is defined to investigate the shadowing effect and influencing factors as well. The results show that: Shadowing effect is weakened with increasing absolute value of shadowing angle and bundled-spacing, but intensified with the increase of median volume diameter (MVD) of droplets; Meanwhile, the shadowing effect experiences a growth and then drops down along with the increase of wind speed, and reach to the max at 15 m/s range 5~20 m/s.
Based on the superposition principle and shadowing effect analysis, a rapid calculating method for ice mass on bundled conductor is proposed. Where iced bundled conductor is regarded as a linear combination of non-shadowed sub-conductor (single conductor) icing intensity and shadowing coefficient, so the icing intensity of various types of bundled conductor can be obtained only requiring the icing intensity of single conductor and the shadowing coefficient in the corresponding environment. Then the rapid icing calculation formulars of 3,4,6,8-bundled conductor under various shadowing angle is given by geometry analysis, respectively, which simplifies the calculation of the icing mass on bundled conductor.
Finaly, a 4-bundled conductor nature icing test was carried out at the Xuefeng Mountain Energy Equipment Safety National Observation and Research Station to validate the accuracy of the numerical simulation and rapid calculation method. Results show that under the environment parameters of ambit temperature Tf = -2℃, MVD = 25.4 μm, liquid water content Lwc = 0.61 g/m3, wind speed V = 10 m/s and shadowing angle θ = 2°, the difference in icing intensity between rapid calculation and test results was within -4.01% to -19.77%, the icing thickness differences of sub-conductors were between 1.66% to -6.36% and the differences in shadowing coefficient were between 4.05% to 5.33%, which well verifies the accuracy of the rapid calculation method proposed in this paper.
Key wordsTransmission line    icing    bundled conductor    numerical simulation    nature icing test   
收稿日期: 2024-04-22     
PACS: TM85  
基金资助:国家自然科学基金项目(U23B20121, 52177015, 52307158)和湖南省教育厅科研项目(22C0157)资助
通讯作者: 杨 鑫 男,1983年生,教授,博士生导师,研究方向为低温高压绝缘技术、过电压及其防治技术、多场耦合的相关计算等。E-mail:yan_19830713@163.com   
作者简介: 黄亚飞 男,1994年生,博士,讲师,研究方向为电网防灾减灾、电力设备覆冰灾害防御。E-mail:huang_yafei@foxmail.com
引用本文:   
黄亚飞, 陈阳宁, 杨鑫, 蒋兴良, 范才进. 基于遮蔽效应分析的分裂导线覆冰特性及快速计算方法[J]. 电工技术学报, 2025, 40(9): 2852-2863. Huang Yafei, Chen Yangning, Yang Xin, Jiang Xingliang, Fan Caijin. Icing Characteristics and Rapid Calculating Method of Bundled Conductor of Transmission Line Based on Shadowing Effect Analysis. Transactions of China Electrotechnical Society, 2025, 40(9): 2852-2863.
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