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Study on Change Mechanism of Low Frequency Dielectric Loss of XLPE Cable Insulation with Different Purity During Thermocycling Process
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Xiaohui ZHU1, Zhengzheng MENG1, Pengxian SONG1, Chong HAN2, Zhonglei LI2
Insulating Materials | 2021, 54(12) : 87 - 93
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Insulating Materials | 2021, 54(12): 87-93
• Insulation Technology •
Study on Change Mechanism of Low Frequency Dielectric Loss of XLPE Cable Insulation with Different Purity During Thermocycling Process
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Xiaohui ZHU1, Zhengzheng MENG1, Pengxian SONG1, Chong HAN2, Zhonglei LI2
Affiliations
  • 1Electric Power Research Institute of Tianjin Electric Power Corporation, Tianjin 300384, China
  • 2School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Published: 2021-12-20 doi: 10.16790/j.cnki.1009-9239.im.2021.12.014
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The paper proposes a evaluation method for the micro properties of impurity content for cable insulation, which can effectively avoid the effect of subjective factors of manual microscopic observation in the purity evaluation process. On the basis of broadband dielectric impedance spectroscopy method, the change law of dielectric loss factor of 35 kV and 110 kV XLPE cable insulation samples with the test frequency during different thermocycling processes were investigated, and the stress characteristics at the interface between XLPE insulation and impurity during the thermocycling process were simulated. The correlation between the macrophysical parameter broadband dielectric loss and the microscopic property cleanliness for XLPE cable insulation were analyzed. The results show that after 10 cycles of thermocycling between -196℃ and 50℃, the low-frequency dielectric loss factor of 35 kV XLPE cable insulation at 0.1-1.0 Hz is more than doubled, while the dielectric loss factor of 110 kV XLPE sample does not change obviously. The simulation analysis shows that during the thermocycling process, there is interface stress between the polyethylene insulation and the micro-impurities, the stress fatigue enlarges the microscopic defects in the interface area and then accelerates the increase of low-frequency dielectric loss factor.

XLPE insulation  /  impurity  /  dielectric loss factor  /  thermocycling
Xiaohui ZHU, Zhengzheng MENG, Pengxian SONG, Chong HAN, Zhonglei LI. Study on Change Mechanism of Low Frequency Dielectric Loss of XLPE Cable Insulation with Different Purity During Thermocycling Process[J]. Insulating Materials, 2021 , 54 (12) : 87 -93 . DOI: 10.16790/j.cnki.1009-9239.im.2021.12.014
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.12.014
  • Receive Date：2021-02-03
  • Online Date：2026-03-23
  • Published：2021-12-20
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  • Received：2021-02-03
  • Revised：2021-09-16
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    1Electric Power Research Institute of Tianjin Electric Power Corporation, 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.2021.12.014
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
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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