Transactions of China Electrotechnical Society  2017, Vol. 32 Issue (11): 225-232    DOI:
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Influence of Nano-Al2O3 on Electrical Properties of Insulation Paper under Thermal Aging
Yan Shuiqiang1, Liao Ruijin1, Lü Yandong2, Zhao Xuetong1, He Lihua1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. Alstom Grid Technology Center Co. Ltd Shanghai 201114 China

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Abstract  

In order to study the effect of nano-Al2O3 on the electrical properties of insulation paper under thermal aging, composite paper with 2% nano-Al2O3 and conventional paper were prepared, then the accelerated thermal aging test under 130 ℃ with conventional oil-paper and nano-Al2O3 composite oil-paper were performed. The main electrical parameters of paper and aging products in oil-paper system were tested. The modification mechanisms of nano-Al2O3 on electrical properties were researched, and the variations in properties of insulation paper during aging process were analyzed. The research results show that nano-Al2O3 improves the electrical properties and anti-aging ability of composite paper. The electric double layer structure of nano-Al2O3 can weaken the interfacial polarization and dipole polarization, which reduces the permittivity and dielectric loss. It is considered that nano-Al2O3 effectively decreases the carrier mobility and increases the volume resistivity of composite paper. High thermal conductivity of Al2O3 and the connection structure between nano-Al2O3 and cellulose chains may increase the thermal conductivity of insulation paper and accelerate the heat diffusion in composite paper, so that the anti-aging ability of composite paper gets enhanced.

Key wordsInsulation paper      nano-Al2O3      electrical properties      thermal aging      thermal conductivity     
Received: 23 March 2016      Published: 20 June 2017
PACS: TM215.6  
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