Electric Field Distribution of Soluble Salt Deposition on the Surface of Insulators in Railway Overhead Lines*

doi:10.23919/CJEE.2022.000031

Chinese Journal of Electrical Engineering ›› 2022, Vol. 8 ›› Issue (3): 123-132.doi: 10.23919/CJEE.2022.000031

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Electric Field Distribution of Soluble Salt Deposition on the Surface of Insulators in Railway Overhead Lines^*

Sihua Wang^1,2, Junjun Wang^1,*, Long Chen¹, Lei Zhao¹

1. School 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

Received:2021-01-15 Revised:2021-04-22 Accepted:2021-05-14 Online:2022-09-25 Published:2022-10-21
Contact: * E-mail: 2473844386@qq.com
About author:Sihua Wang was born in Jiangsu Province (China), on May 21, 1968. He graduated from the East China Jiaotong University, Electrical Engineering and Automation in Jiangxi, China, in 1995. He received the Postgraduate Diploma in Electrical Engineering and Automation from Lanzhou Jiaotong University (China), in 1995. He is a full Professor at the School of Automation and Electrical Engineering in Lanzhou Jiaotong University (China). His research interests concern reliability of substation integrated automation and direction of HV insulation.
Junjun Wang is studying for a master’s degree in the Lanzhou Jiaotong University, Electrical Engineering in Lanzhou (China). His research interests mainly include outer insulation of high voltage insulators.
Long Chen is studying for a master’s degree in the Lanzhou Jiaotong University, Electrical Engineering in Lanzhou (China). His research interests mainly include insulator status assessment.
Lei Zhao is studying for a master’s degree in the Lanzhou Jiaotong University, Electrical Engineering in Lanzhou (China). His research interests mainly include flexible DC grid protection and control.
Supported by:
* National Natural Science Foundation of China (51767014) and the Scientific and Technological Research and Development Program of the China Railway (2017J010-C/2017).

Abstract

Abstract: Different constituents of soluble salts have different effects on the insulation performance of insulators. To study the electric field distribution of soluble salt deposition on the surface of high-speed railway insulators, a two-dimensional model of the cantilever insulator electrostatic field and constant-current field with soluble salt deposition is constructed. The simulation results indicate that the relative dielectric constant of dry pollution is the main factor that affects the electric field distribution on the surface of the insulator. The electric field intensity is arranged in the following order: CaSO₄>KNO₃>NaNO₃>K₂SO₄>NaCl>MgSO₄, and the conductivity of each dirty liquid in the wet state becomes a key factor affecting the electric field distribution, which is specifically shown as sodium chloride>nitrate>sulfate. The simulation results are compared with existing test results to verify that they were correct. It is also found that the electric field intensity of the insulator with good hydrophobicity is slightly greater than that of the insulator without hydrophobicity. The results provide a theoretical basis for the classification of regional pollution levels and the testing of insulator contamination in the laboratory.

Key words: Catenary insulator, soluble salt composition, electric field intensity, electrostatic field, constant-current field

Sihua Wang, Junjun Wang, Long Chen, Lei Zhao. Electric Field Distribution of Soluble Salt Deposition on the Surface of Insulators in Railway Overhead Lines^*[J]. Chinese Journal of Electrical Engineering, 2022, 8(3): 123-132.

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Electric Field Distribution of Soluble Salt Deposition on the Surface of Insulators in Railway Overhead Lines^*

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