Effect of Moisture Content and Aging State on the Dielectric Properties of Silicone Oil

doi:10.11930/j.issn.1004-9649.202109137

Abstract

Abstract: The aging and dampness of silicone oil caused by long-term electrical and thermal combined stress and humid environment seriously threatens the safe and stable operation of the oil-filled cable terminals. Studying the influence of the moisture content and aging state of silicone oil on its dielectric properties is conducive to promoting the application of dielectric testing methods in the diagnosis of the insulation state of the silicone oil in oil-filled terminals. Therefore, unaged silicone is selected for testing on natural moisture absorption and electric-heat combined aging, and 6 groups of silicone oil samples with different moisture content and 6 groups of silicone oil samples with different aging states are prepared respectively. And then, the oil samples are tested on polarization and depolarization current (PDC). Based on the PDC testing results, the silicone oil with different insulation states are analyzed on DC conductivity and polarization loss factor spectra. Finally, the oil carrier migration and distribution model is used to calculate the relaxation parameter, which can sensitively characterize the concentration of moisture content in the silicone oil and the concentration of the by-products of silicone oil degradation. Thereafter, a quantitative relationship is established between this parameter and the insulation state of silicone oil.

Key words: silicone oil, moisture content, electrical and thermal combined aging, polarization and depolarization current, dielectric properties

WANG Feifeng, GUO Jinming, TIAN Shujun, ZHUO Haoze. Effect of Moisture Content and Aging State on the Dielectric Properties of Silicone Oil[J]. Electric Power, 2022, 55(3): 48-56.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202109137

https://www.electricpower.com.cn/EN/Y2022/V55/I3/48

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