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| Icing Characterization of Insulator Based on the Equivalent Collision Coefficient of Standard Rotating Conductors |
| Zhang Zhijin, Zhang Yi, Jiang Xingliang, Liang Tian, Hu Jianlin |
| State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology Chongqing University Chongqing 400030 China |
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Abstract The electrical characteristics of insulator are related to the degree of icing, but the methods of characterizing insulator icing level are various and cannot reflect the difference of insulator structure. This paper took porcelain insulator XP-70 and standard rotating conductor as the research objects. The method based on the equivalent collision coefficient of standard rotating conductors to characterize insulator icing was proposed and the numerical calculation model of the water droplets collision coefficient of insulator as well as the standard rotating conductor was established. Then the equivalent relationship of water droplets collision coefficient between insulator and the rotating conductor was analyzed and verified through the icing test. Research results show that, the larger the wind velocity and median volume diameter is, the larger the water droplets collision coefficient of insulator and rotating conductor is, and the smaller the water droplets collision coefficient ratio of insulator to standard rotating conductor is. In the same environment, the ice mass of insulators increases linearly with the increase of ice mass of standard rotating conductors, and the slope k1 is the ratio of insulator ice mass to standard rotating conductor ice mass. When the freezing coefficient is considered, the relative error between the theoretical ratio k of insulator ice mass to standard rotating conductors ice mass based on equivalent collision coefficient and experimental value k1 is less than 20%. Therefore, the research results can provide reference for the characterization of insulator icing degree.
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Received: 18 October 2017
Published: 12 November 2018
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2018, Vol. 33 
