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Characteristics of icing without icicle on insulators under natural conditions
Cold Regions Science and Technology ( IF 4.1 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.coldregions.2020.103153
Xingbo Han , Xingliang Jiang

Abstract Icing on insulators seriously threatens the safe and stable operation of transmission lines. Most of the existing research has focused on the flashover characteristics of ice-covered insulators, lacking attention to the icing process on insulators. In order to reveal the mechanism of insulator icing, and lay the foundation for further establishment of insulator ice flashover model, this paper studies the characteristics of insulator icing without icicle. The characteristics of icing processes including the collision and freezing of water droplets, the generation and flowing of water film are analysed. On this basis, a three-dimensional numerical calculation model of insulator icing without icicle is established by using boundary element method, and the expressions of the local icing weight and thickness on the insulator surface are derived through the droplet local collision efficiency and freezing efficiency. Moreover, the time-varying characteristics of icing parameters are simulated. And the related icing tests are conducted on two kinds of insulators with different structures at Xuefeng Mountain. The results show that the distribution of collided water droplets and water film on the insulator surface will change with the increasing ice weight. Under natural conditions, compared with the aerodynamic insulator LDQ-100, the insulator LXY-120 with a smaller skirt diameter and a larger inclination angle can have a faster icing rate. However, at the insulator edge, the insulator LDQ-100 with a thinner shed has a greater icing rate of thickness. Compared with the test results, the simulation error of the model in this paper is within 15%.

中文翻译:

自然条件下绝缘子无冰柱覆冰特性

摘要 绝缘子结冰严重威胁输电线路的安全稳定运行。现有的研究大多集中在覆冰绝缘子的闪络特性上,对绝缘子的覆冰过程缺乏关注。为了揭示绝缘子覆冰的机理,为进一步建立绝缘子冰闪模型奠定基础,本文研究了绝缘子覆冰无冰柱的特性。分析了水滴碰撞和冻结、水膜的产生和流动等结冰过程的特点。在此基础上,采用边界元法建立绝缘子覆冰无冰柱三维数值计算模型,通过液滴局部碰撞效率和冻结效率推导出绝缘子表面局部结冰重量和厚度的表达式。此外,还模拟了结冰参数的时变特性。并对雪峰山两种不同结构的绝缘子进行了相关的覆冰试验。结果表明,随着冰重的增加,绝缘子表面碰撞的水滴和水膜的分布会发生变化。在自然条件下,与气动绝缘子LDQ-100相比,裙径较小、倾角较大的绝缘子LXY-120可以有更快的结冰速度。然而,在绝缘子边缘,伞裙越薄的绝缘子LDQ-100的厚度覆冰率越大。与测试结果相比,
更新日期:2020-12-01
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