1. Effects of thermal aging on moisture diffusion in insulation paper immersed with mineral oil
- Author
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Lijun Zhou, An Wang, Dongyang Wang, Li Huize, Lei Guo, Yi Cui, and Liao Wei
- Subjects
010302 applied physics ,Moisture absorption ,Materials science ,Moisture ,020209 energy ,Thermal aging ,02 engineering and technology ,Moisture diffusion ,01 natural sciences ,Equilibrium moisture content ,Accelerated aging ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,Electrical and Electronic Engineering ,Diffusion (business) ,Composite material ,Mineral oil ,medicine.drug - Abstract
Thermal aging of insulation paper has obvious effects on its moisture absorption property. The presented studies aim to investigating the effects of aging on moisture diffusion in oil-immersed insulation paper. Based on the experimental designs and preparation of experimental materials, the transient moisture contents of insulation paper with different aging status were obtained at different conditions. Then, the experimental results were discussed. Furthermore, the diffusion factors and equilibrium time constants were extracted based on the model of moisture diffusion in oil-immersed insulation paper, which are applicable to our studies. Finally, the effects of thermal aging on the diffusion factor and equilibrium time constant were analyzed. The results show that: 1) With the aging of insulation paper, the rate of moisture absorption increases, and the equilibrium moisture content of insulation paper decreases at the same temperature. Besides, the equilibrium time constant decreases with aging at the same temperature. 2) Considering the effects of aging, thickness of insulation paper and temperature, the empirical expression of diffusion factor was obtained and verified.
- Published
- 2018