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| Study on Thermo-Oxygen Aging Characteristics of Epoxy Resin Material |
| Xie Wei1, Yang Zheng2,3, Cheng Xian2,3, Li Wenbo2,3, Chen Shuo2,3 |
1. Henan Engineering Research Center of Power Transmission & Distribution Equipment and Electrical Insulation Zhengzhou 450001 China;
2. School of Electrical Engineering Zhengzhou University Zhengzhou 450001 China;
3. State Grid Henan Electric Power Company Electric Power Research Institute Zhengzhou 450001 China |
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Abstract With the popularization of electrical equipment that uses epoxy resin as the main insulating medium, the insulation degradation of epoxy resin has been widely concerned. In order to study the insulation degradation caused by epoxy resin under thermal accumulation, thermal oxygen aging test was carried out. The results show that the thermal mass loss changes uniformly with aging time, and the service life can be predicted well. Partial discharge (PD), dielectric loss angle tangent (tanδ ) and relative permittivity (εr) all show a piecewise trend, while the resistance (Ωr) only decreases significantly near the end of aging. Ether cleavage is the main cause of material insulation failure. As the aging time increases, the surface of the epoxy resin splits to form granular materials, the cracks increase, and the spacing increases, which provides a reference for insulation status monitoring of epoxy resin.
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Received: 11 September 2019
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2020, Vol. 35 
