Analysis on Aging Characteristics of the Sheds of DC Composite Insulator under the Influence of Karst Mountain Col Geomorphology

doi:10.11985/2021.03.023

Abstract

Abstract:

In order to study the particularity of the aging characteristics of DC composite insulator sheds operating in the karst mountain col area, insulators with the same operating life from the karst mountain col and plain areas are selected. Shed hydrophobicity, contamination quantity and composition are tested, then performance differences between the two are compared, and the possible influencing factors that cause such differences are discussed. The results show that the overall aging degree of the DC composite insulator sheds operating at the karst mountain col area is rather serious, which is caused by the combined influence of factors including the special terrain, weather, and pollution in the area. The strong wind passing through the sheds will cause stress concentration, leading to cracks at the root of the shed; the penetration from the surface and cracks of acid liquid, if any, will accelerate the cracking and aging of the internal silicone rubber; moreover, the carbonates enriched on the shed surface will gradually transform into more corrosive sulfate ions in an acidic environment, leading to pulverization and deeper corrosion of the shed surface.

Key words: Composite insulator, karst, col geomorphology, shed, aging characteristics

CLC Number:

TM216

ZHAO Wei, CHEN Rongsheng, JIANG Miao, WU Hao, QIU Zizhen, FAN Binghong, LI Li. Analysis on Aging Characteristics of the Sheds of DC Composite Insulator under the Influence of Karst Mountain Col Geomorphology[J]. Journal of Electrical Engineering, 2021, 16(3): 170-176.

Figures/Tables 8

References 20

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样品编号	运行线路	地形区	串型	投运年份	运行年限/a
A-1	天广直流	山地垭口	单I型	2012	8
A-2	天广直流	山地垭口	双I型	2012	8
A-3	兴安直流	山地垭口	单I型	2012	8
B-1	天广直流	平原	单I型	2012	8
B-2	天广直流	平原	双I型	2012	8
B-3	兴安直流	平原	单I型	2012	8

样品编号	憎水性分级(HC)
样品编号	高压端	中部	低压端
A-1	4	3	3
A-2	4	4	4
A-3	3	3	3
B-1	2	2	2
B-2	4	3	3
B-3	3	3	2