覆冰地区分裂与等效扩径导线表面电场特性
作者:
作者单位:

1.国网重庆市电力公司经济技术研究院;2.输配电装备及系统安全与新技术国家重点实验室重庆大学

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TM711??????

基金项目:

国家自然科学基金(51637002)、国网重庆市电力公司科技项目(SGCQJY00JJS190061)


Surface Electric Field Characteristics of Bundle Wire and Expanded Wire in Icing Area
Author:
Affiliation:

1.Institute of Economics and Technology of State Grid Chongqing Electric Power Company,Yubei District;2.State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University,Shapingba District

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    摘要:

    输电线路覆冰对电力系统安全运行具有严重威胁,目前已经发展有多种防冰除冰方法,但每种方法都有其局限性,对于一些具有微气象、微地形特征的重覆冰地区尚未有较好的解决方法。本文考虑到扩径导线的特点以及分裂导线输电线路的局限性,根据波阻抗和自然功率将分裂导线等效为单导线,并考虑电流的集肤效应,得到了等效的单根扩径导线,进而分析比较覆冰地区的分裂导线及其等效的单根扩径导线的表面电场特性。研究表明,等效前后导线截面面积相同且波阻抗一致时,扩径导线与分裂导线相比,不仅显著降低子导线根数以及输电线路的覆冰荷载,而且在扩径导线的半径等于分裂导线的等效单导线半径时,扩径导线的表面最大电场强度小于分裂导线。因此,在严重覆冰地区,采用分裂导线等效半径的扩径导线具有非常好的表面电场特性,可显著降低冰风荷载,提高抗冰强度。

    Abstract:

    Icing disaster of transmission line was a serious threat to the safe operation of the power system. Currently, a variety of anti-icing and de-icing methods have been developed, but each method has its limitations. There was no good solution for some serious icing areas with micro-climate and micro-topography characteristics. This paper takes into account the characteristics of expanded conductors and the limitations of bundle conductor transmission lines. According to the wave impedance and natural power, the split conductor is equivalent to a single conductor, and considering the skin effect of current, the equivalent single expanded conductor is obtained, and then the surface electric field characteristics of split conductor and its equivalent single expanded conductor in icing area are analyzed and compared. Studies have shown that when the total conductor cross-sectional area of the conductor cross-section before and after the equivalent is the same and the wave impedance is the same, compared with the bundle conductor, the expanded conductor not only significantly reduced the number of sub-conductors and the icing load of transmission line, but also when the radius of the expanded wire was equal to the equivalent single wire radius of the bundle conductors, The maximum electric field intensity on the surface of the expanded conductor is smaller than that of the bundle conductor. Therefore, in severely icing areas, the expanded wire with the equivalent radius of the bundle conductors had very good surface electric field characteristics, which could significantly reduce the ice wind load and improve the anti-icing capacity.

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  • 收稿日期:2021-07-07
  • 最后修改日期:2021-09-15
  • 录用日期:2021-10-06
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