Research on mechanical and dielectric properties of XLPE cable under accelerated electrical‐thermal aging |
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Authors: | Dongxin He Jiefeng Gu Wei Wang Shiyuan Liu Shu Song Denghui Yi |
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Institution: | 1. Beijing Key Laboratory of High Voltage and Electromagnetic Compatibility, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China;2. State Grid Zhejiang Electric Power Company Economic Research Institute, Hangzhou, China |
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Abstract: | Research into the electrical‐thermal aging properties of cross‐linked polyethylene (XLPE) cable has great significance, because of its wide application. This study conducted accelerated electrical‐thermal aging tests on 10‐kV XLPE cable in order to assess the cable's mechanical and dielectric properties. After being aged by applying 34.8‐kV AC voltage at the four temperatures of 90, 103, 114, and 135°C, the cable samples were taken out in five stages according to the aging time and cut into slices. The slices were conducted experiments to test the breaking elongation, tensile strength, gel content, breakdown voltage, and frequency spectrums of the dielectric constant and dielectric loss. The results demonstrate that the mechanical strength and gel content of XLPE vary greatly under different aging temperatures, a finding that is associated with the crystallization characteristics of the material. The breakdown voltage shows a slight decreasing trend with aging time. The dielectric constant decreases with aging time in high‐frequency areas (103–106 Hz), while the dielectric loss factor increases with aging time at low frequencies (10?2–0 Hz). These two parameters can be used to characterize the degree of aging in cable. Copyright © 2016 John Wiley & Sons, Ltd. |
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Keywords: | electrical‐thermal aging XLPE cable mechanical strength gel content breakdown voltage dielectric frequency |
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