Effect and Mechanism of Salt Spray on Electrical Insulation Properties of Silicone Rubber for Cable Accessories

doi:10.11930/j.issn.1004-9649.202211091

Abstract

Abstract: Salt spray is an unavoidable environmental factor for the operation of offshore power equipment, which can easily cause discharge faults such as flashover and breakdown of cable accessories. In this paper, a study was conducted on the variation features of electrical insulation properties of silicone rubber materials after salt spray treatment in terms of microstructure, hydrophobic properties, dielectric properties, surface properties and discharge characteristics, and the influence mechanism of salt spray on insulation properties of silicone rubber materials was explored. The experimental results show that the hydrophobic properties of silicone rubber gradually decrease with the aging time. The penetration of salt spray solution into the silicone rubber surface leads to the increase of water molecules and impurity ions, consequently resulting in the decrease of the surface resistivity and the rise of the surface traps. Besides, both of the flashover voltage and the breakdown strength decrease to a certain extent, owing to the corrosion of Cl^–1, which will destroy the molecular chain of silicone rubber samples. This study has guiding significance for evaluation of the aging performance and failure of cable accessories.

Key words: offshore power equipment, cable accessories, silicone rubber, salt spray, insulation characteristics

WANG Jingbing, ZHANG Fan, CHENG Zhaolu, WANG Jiaxing, ZHOU Xuguang, QI Pengshuai, WEI Yanhui, LI Guochang. Effect and Mechanism of Salt Spray on Electrical Insulation Properties of Silicone Rubber for Cable Accessories[J]. Electric Power, 2023, 56(6): 82-89,100.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202211091

https://www.electricpower.com.cn/EN/Y2023/V56/I6/82

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