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Effect of mesoscale crystal morphology on breakdown characteristics of XLPE cable insulation
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Xiaohui ZHU1, Zhengzheng MENG1, Mingzheng ZHU1, Pengxian SONG1, You WU2, Yuming DONG2, Zhonglei LI2, Boxue DU2
Insulating Materials | 2023, 56(11) : 16 - 22
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Insulating Materials | 2023, 56(11): 16-22
• Material Research •
Effect of mesoscale crystal morphology on breakdown characteristics of XLPE cable insulation
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Xiaohui ZHU1, Zhengzheng MENG1, Mingzheng ZHU1, Pengxian SONG1, You WU2, Yuming DONG2, Zhonglei LI2, Boxue DU2
Affiliations
  • 1Electric Power Research Institute, State Grid Tianjin Electric Power Company, Tianjin 300384, China
  • 2School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Published: 2023-11-20 doi: 10.16790/j.cnki.1009-9239.im.2023.11.003
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In order to study the effect of mesoscale crystal morphology of XLPE material on its AC breakdown characteristics and analyze its mechanism, XLPE samples with different crystal morphologies were prepared by controlling the cooling rate of samples during cooling crystallization. At the same time, the crystalline structure and morphology of the samples were characterized and observed by scanning electron microscope (SEM) and X-ray diffraction (XRD), and its dielectric properties were tested by the broadband dielectric spectrometer, three electrode system, and AC breakdown system. Finally, the test results were verified and the mechanism was analyzed by means of simulation. The results show that decreasing the cooling rate can prolong the crystallization time, making the molecular chains regularly arrange and stack to form large-size spherulites with a relatively high crystal area and relatively perfect structure. The improvement of crystal structure makes the relative dielectric constant of the XLPE sample increase slightly, the conductivity decrease, and the breakdown strength and stability significantly improve. The simulation results are consistent with the test results. The perfect crystal morphology of the sample at mesoscale reduces the degree of electric field distortion between spherulites and inhibits the occurrence of partial discharge and breakdown.

cross-linked polyethylene  /  mesoscale  /  crystal morphology  /  breakdown characteristics  /  electric field simulation
Xiaohui ZHU, Zhengzheng MENG, Mingzheng ZHU, Pengxian SONG, You WU, Yuming DONG, Zhonglei LI, Boxue DU. Effect of mesoscale crystal morphology on breakdown characteristics of XLPE cable insulation[J]. Insulating Materials, 2023 , 56 (11) : 16 -22 . DOI: 10.16790/j.cnki.1009-9239.im.2023.11.003
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2023.11.003
  • Receive Date：2022-12-05
  • Online Date：2025-11-24
  • Published：2023-11-20
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  • Received：2022-12-05
  • Revised：2023-02-09
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Affiliations
    1Electric Power Research Institute, State Grid Tianjin Electric Power Company, Tianjin 300384, China
    2School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2023.11.003
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表12种不同金属材料的力学参数
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Family		 属数
Number of
genus		 种数
Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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