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| Effects of Cellulose Ageing on Moisture Diffusion in Paper Immersed with Mineral Oil |
| Zhou Lijun1, Li Huize1, Wang An1, Wang Dongyang2, Liao Wei1 |
1. College of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China;
2. CRRC Qingdao Sifang Co. Ltd Qingdao 266111 China |
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Abstract Cellulose aging has obvious effects on its moisture absorption property. In order to evaluate the moisture content of insulation paper more effectively, this paper studies the influence of cellulose aging on the moisture diffusion in insulation paper. First, the transient moisture in the oil immersed insulation paper under different temperatures and different thickness was obtained by handing and testing experimental materials. Then, basing on the Fick’s second law and the finite element simulation model, the moisture diffusion coefficient and the equilibrium time constant of different aging oil immersed insulation paper are obtained. Finally, the effects of cellulose aging on diffusion coefficient and equilibrium time constant were studied. In the study temperature range, the diffusion coefficient has the empirical expression. The results show that 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.
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Received: 26 March 2018
Published: 17 April 2019
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通信作者:周利军男,1978年生,教授,博士生导师,研究方向为电气设备状态检测与故障诊断.E-mail:zhoulijun@swjtu.cn |
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2019, Vol. 34 
