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Analysis of critical condition for dry and wet growth icing on insulators

机译：浅析绝缘子干湿生长的关键条件

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摘要

Icing on the insulators of transmission lines threats the safe operation of power system. Most of the existing researches focus on the discharge and flashover characteristics of ice-covered insulators. There is a lack of research on the growing process of insulator icing. In this paper, the critical condition for the dry and wet growth icing on insulators is taken as the research object. The calculation formulas of the freezing time of droplets and the collision interval time between adjacent water droplets are derived, based on which, the parametric characterization of different insulator icing types is proposed. By deriving the expression of the local collision efficiency beta(3), the distribution of water film on the insulator surface is obtained, which is used to distinguish the dry and wet growth icing on insulators. It is found that the critical condition of dry and wet growth icing is the condition that make the area covered with water film decrease to zero. With the decrease of temperature and droplets' size, the area covered with water film decreases from the periphery of the droplet collision region to the centre, which is consistent to the observation test result on Xuefeng Mountain.
机译：在传输线的绝缘体上结冰威胁到电力系统的安全操作。大多数现有研究专注于冰盖绝缘子的放电和闪络特性。缺乏关于绝缘体结冰的过程的研究。本文认为，在绝缘体上结冰的干燥和湿生长的临界条件作为研究对象。基于该液滴的冻结时间和相邻水滴之间的碰撞间隔时间的计算公式，提出了不同绝缘体糖合类型的参数表征。通过得出局部碰撞效率β（3）的表达，获得了绝缘体表面上的水膜的分布，其用于区分绝缘体上的干燥和湿生长冰。发现干燥和湿润生长结冰的临界条件是使水膜覆盖的面积减小为零的条件。随着温度和液滴的尺寸减小，水膜覆盖的面积从液滴碰撞区域的周边降低到中心，这与Xuefeng山的观察试验结果一致。

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  • 来源
    《Electric power systems research》 |2021年第3期|107006.1-107006.8|共8页
  • 作者

    Han Xingbo; Jiang Xingliang;

  • 作者单位

    Chongqing Jiaotong Univ Sch Mech & Vehicle Engn Chongqing 400074 Peoples R China;

    Chongqing Univ Coll Elect Engn State Key Lab Power Transmiss Equipment & Syst Se Chongqing 400044 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Icing; Insulator; Dry-growth; Wet-growth; Water film;

    机译：结冰;绝缘体;干生长;湿润;水膜;

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