Study on Thermal Aging Properties of Nano-CB/XLPE Composite Insulating Materials

doi:10.11985/2019.03.005

Abstract

Abstract:

Adopting nano-carbon black to cross-linked polyethylene is a possible technical approach to prepare insulation materials for HVDC cables with low activation energy and high electric field dependence coefficient. And the thermal aging performance of composites combined with the nano-carbon black and the cross-linked polyethylene (nano-CB/XLPE) is one of critical factors which are related to the long-term operation reliability of the HVDC Cable. Therefore, the regularity about the effect of aging time on the conductivity and dielectric constant is studied, by accelerating heat the nano-CB/XLPE composites. In order to characterize the aging degree of composites, the changes of internal characteristic functional groups in the aging process are observed by using the Fourier transform infrared spectroscopy (FTIR), and the microstructure changes of composites during aging are investigated by using the scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The experimental results show that nano-CB/XLPE composites can be divided into two aging stages with aging time. In the initial stage of aging, the carbonyl index of the sample increases slowly, the crystallinity is large, and the conductivity decreases with the increase of aging time, while the activation energy of conductivity increases with the increase of aging time. At the same time, the electric field dependence coefficient changes little, and the dielectric constant and dielectric loss factor are basically unchanged. However, in the later stage of aging, the carbonyl index of the sample increases rapidly, the crystallinity decreases, the conductivity increases with the increase of aging time, the activation energy of the conductivity as well as the electric field dependence coefficient decreases, and the dielectric constant and dielectric loss factor increase with the increase of aging time.

Key words: XLPE composite, thermal aging, dielectric properties, micro-structure

CLC Number:

TM215

QIN Yao,LI Zhonghua,SUN Yunlong. Study on Thermal Aging Properties of Nano-CB/XLPE Composite Insulating Materials[J]. Journal of Electrical Engineering, 2019, 14(3): 33-40.

Figures/Tables 15

References 28

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