Numerical Model of Bubble Formation in Oil-impregnated Paper Based on Bubble Dynamics

被引：0
|
作者：
Huang Y. [1 ]
Zhou Y. [1 ]
Luo Y. [2 ]
Shi M. [2 ]
Yang X. [1 ]
机构：
[1] State Key Laboratory of Disaster Prevention & Reduction for Power Grid, School of Electrical & Information Engineering, Changsha University of Science and Technology), Changsha
[2] Guangdong Provincial Key Laboratory of Electric Power Equipment Reliability, Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou
来源：
Gaodianya Jishu/High Voltage Engineering | 2024年 / 50卷 / 04期
基金：
中国国家自然科学基金;
关键词：
bubble dynamics; bubble formation; ITBE; oil-immersed power transformer; Rayleigh-Plesset equation;
D O I：
10.13336/j.1003-6520.hve.20230660
中图分类号：
学科分类号：
摘要：
Bubbles usually generate from the surface of the insulation paper in oil-immersed power transformer due to the temperature rise, which initiates partial discharge and causes the breakdown failure of insulation. By studying the mechanism of bubble inception, a numerical simulation model of bubbles evolution from the microstructure of the oil-paper interface is developed. Firstly, the bubble growth progress dominated by internal pressure is established based on the Rayleigh-Plesset equation. Then, the mass flux of vapor at the bubble surface and bubble internal pressure is estimated based on the Idea Gas Law and Hertz-Knudsen equation. Finally, by calculating the bubble growth curve, the bubble detachment radius and the Initial Temperature of Bubble Escape (ITBE) is obtained according to the forces balance during bubble growth. The calculated bubble detachment radius is in good agreement with the experimental results. And the minimum average relative error between the calculated ITBE and the experimental data is only 1.11%. The model result shows that the higher the moisture content in the paper, the faster the bubble growth. Besides, the change of the microstructure of insulating paper affects the evolution process of the bubble by influencing the initial radius of the bubble and the surface tension of the bubble at the interface. © 2024 Science Press. All rights reserved.
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页码：1704 / 1713
页数：9
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