Simulation of Metal Particles Generation Process in SF6 DC Wall Bushing and Experimental Study of Flashover Characteristics

被引：0
|
作者：
Yang Z. [1 ]
Qi B.
Dong H. [1 ]
Zhang Y. [1 ]
Yang X. [1 ]
Luo Y. [1 ]
Lu L. [2 ]
Li C. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Changping District, Beijing
[2] State Grid Smart Research Institute Company Ltd., Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 07期
关键词：
contact wear; flashover voltage; micron metal particles; particle characteristics; particle size distribution; wind-induced vibration;
D O I：
10.13334/j.0258-8013.pcsee.221459
中图分类号：
学科分类号：
摘要：
Wall bushing is one of the irreplaceable key equipment in the ultra-high voltage direct current (UHVDC) transmission project. In SF6 gas-insulated DC wall bushing, the friction between components will produce a great quantity of metal particles, which is one of the main reasons for the insulation failure. Therefore, it is of great significance to study the generation process and morphology characteristics of metal particles, and to study their influence on flashover. In this paper, the vibration amplitude and frequency of the spring under the conditions of temperature change and wind-induced vibration in a certain UHV project are calculated. The results show that the wear degree of the contact under fluctuating wind is greater, which is the main source of metal particles. Under the coupling effect of adhesive wear and abrasive wear, the particles are basically in the micron scale, which includes Al, Zn, Ag, and Cu, and the big particles are chip-shape while the small ones are ellipsoid-shape. Under the effect of Coulomb force, the particles mainly adhere on the epoxy surface with stronger normal electric field. The micron metal particles can reduce the epoxy flashover voltage by 20%. This work can provide a reference for the further study of the influence of metal particles on insulation characteristics. ©2023 Chin.Soc.for Elec.Eng.
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页码：2848 / 2857
页数：9
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