CJEE

Chinese Journal of Electrical Engineering ›› 2019, Vol. 5 ›› Issue (3): 59-66.doi: 10.23919/CJEE.2019.000021

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Effect of Salty Fog on Flashover Characteristics of OCS Composite Insulators*

Sihua Wang1,2,*, Youlong Wu1,2   

  1. 1. College of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
    2. Rail Transit Electrical Automation Engineering Laboratory of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China
  • Online:2019-09-25 Published:2019-12-20
  • Contact: * Email: 643374980@qq.com
  • About author:Sihua Wang was born in Jiangsu Province, China, on May 21, 1968. He graduated in electrical engineering and automation from the East China Jiaotong University, Jiangxi, China, in 1995. He is a professor at Lanzhou Jiaotong University, Lanzhou, China.His research interests concern: Reliability of Substation Integrated Automation and Direction of HV Insulation.Youlong Wu was born in Gansu Province, China, on June 16, 1991. He is studying for a master’s degree in electrical engineering at the Lanzhou Jiaotong University, Lanzhou, China.His research interest concerns high voltage and insulation technology.
  • Supported by:
    * Supported by the Natural Science Foundation of China(51567014, 51767014) and the Scientific and Technological Research and Development Program of the China Railway (2017J010-C/2017)

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Abstract: To study the flashover characteristics of the fog water in saline-alkali areas for high-speed railway OSC insulators, the spatial distributions of both the potential and electric field of soiled insulators in the presence of salty fog are analyzed using COMSOL Multiphysics, a multi-physics coupling software. Furthermore, to analyze the effect of the contamination of insulators due to salty fog water , a saline solution is used for staining an insulator sample by using the solid coating method. In an artificial climate chamber, the salty fog environment is simulated, and the flashover voltage for different salty fog water conductivities and surface staining are obtained. The salt-density correction coefficient K is also proposed. It provides a strong basis for the selection of railway insulators in saline-alkali areas. The results show that the salty fog water changes the original surface equivalent salt density, ρESDD, by wetting the existing fouling layer on the surface of the insulator, so that the original surface contamination layer becomes equivalent to KρESDD; the smaller is the value of ρESDD of the insulator surface, the larger is the value of K; the surface of the same insulator is dirty, and as the concentration of salty fog-water increases, K also increases.

Key words: Salty fog, composite insulators, flashover characteristics, COMSOL multiphysics, additional salt density