Aging Degradation Law of Nomex Insulating Paper for Mining Dry-Type Transformer Under Multi-Factor
CAO Jinmei1, LI Lu1, ZHANG Rui1, LI Yongzhi1, WANG Zhengyu2, CHEN Kun3, SONG Jiancheng1
1 Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control, College of Electrical and Power Engineering, Taiyuan University of Techno-logy, Shanxi 030024, China 2 Zhengzhou Power Supply Company, State Grid Henan Electric Power Company, Henan 450000, China; 3 State Grid Changzhi Power Supply Company,Shanxi 046011, China
Abstract: The insulation state of Nomex paper used in mining dry Transformer could directly influence the reliability of power supply and production safety in underground coal mine, therefore, it is necessary to study the aging law and decomposition characteristics of Nomex paper, which could lay the theoretical foundation for the state evaluation, life analysis and fault diagnosis of mining dry Transformer. In this paper, the accele-rated aging test under the multi-factor combination of Nomex insulation paper was carried out. The effects of voltage, temperature and moisture on the polymerization degree of Nomex paper were analyzed in detail. The variation of kinetic parameters of Nomex paper with DP was investigated by thermal analysis.The results showed that voltage, temperature and moisture factors all accelerated the aging of Nomex insulation paper, and that temperature had a greater effect on insulation aging than voltage when there was moisture; With the deepening of the aging degree, the activation energy of Nomex paper shows the trend of first increasing and then decreasing. The thermal enthalpy value and the degree of polymerization are exponentially attenuated. It could be seen that the thermal enthalpy value can be used as one of the main parameters to evaluate the performance of Nomex insulation paper.
曹金梅, 李璐, 张瑞, 李勇智, 王政宇, 陈昆, 宋建成. 矿用干式变压器诺美(Nomex)绝缘纸多因子老化过程的降解规律[J]. 材料导报, 2020, 34(22): 22195-22200.
CAO Jinmei, LI Lu, ZHANG Rui, LI Yongzhi, WANG Zhengyu, CHEN Kun, SONG Jiancheng. Aging Degradation Law of Nomex Insulating Paper for Mining Dry-Type Transformer Under Multi-Factor. Materials Reports, 2020, 34(22): 22195-22200.
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2020, Vol. 34 
