电工技术学报2016，Vol.31Issue(10)：16-25,10.
油纸绝缘微水二次扩散过渡过程的分析
Analysis of Transition Process During Secondary Diffusion of Moisture in Oil-Paper Insulation
摘要
Abstract
On basis of Fick's second law, a mathematical model is established to analyze the secondary diffusion process of moisture in oil-paper insulation. The secondary diffusion occurs when the external conditions change during the first diffusion. Analysis focuses on the transient process during secondary diffusion, which is initiated by the insufficiency of the first diffusion and is verified by experiments. Two features of the transient process are proposed, namely transition time and relative error. Transient time is the time from the beginning of secondary diffusion to the time when the moisture diffusion direction is consistent everywhere. Transient time is independent of the temperature, paper thickness and the balance ratio of the first diffusion. Relative error emerges when the average moisture content of first diffusion is used as the initial distribution of secondary diffusion. The peak of relative error represents the strength of the transient process, which is influenced by the balance ratio of the first diffusion and steady moisture content. The peak time of relative error represents the speed of transient process, which is influenced by the temperature and paper thickness.关键词
菲克定律/油纸绝缘/水分扩散/过渡过程Key words
Fick's law/oil-paper insulation/moisture diffusion/transient process分类
信息技术与安全科学引用本文复制引用
林元棣,廖瑞金,夏桓桓,杨丽君..油纸绝缘微水二次扩散过渡过程的分析[J].电工技术学报,2016,31(10):16-25,10.基金项目
国家自然科学基金资助项目(51277187). （51277187）
