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Study on moisture characteristics of cold shrinkage intermediate joint for distribution cable
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Weiwei LI1, Rui ZHANG1, Yang LUO1, Xiao LEI1, Xiaoyan CAO2, Yao FU2
Insulating Materials | 2024, 57(4) : 60 - 65
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Insulating Materials | 2024, 57(4): 60-65
• Insulation Technology •
Study on moisture characteristics of cold shrinkage intermediate joint for distribution cable
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Weiwei LI1, Rui ZHANG1, Yang LUO1, Xiao LEI1, Xiaoyan CAO2, Yao FU2
Affiliations
  • 1Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610072, China
  • 2School of Electrical Engineering, Sichuan University, Chengdu 610065, China
Published: 2024-04-20 doi: 10.16790/j.cnki.1009-9239.im.2024.04.009
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To explore the moisture characteristics of the cold shrink intermediate joint for distribution cables at the current stage, undamped joints samples were made firstly in this paper. Accelerated moisture ageing platform was used to treat the samples with moisture. Then the polarization and depolarization current (PDC) test system was used to test the polarization and depolarization currents of the samples which damped for 0, 2, 4, 6, and 8 weeks. At last, their DC conductivity was calculated, and the time constant of three branches was obatined by branch identification. The experimental results show that the DC conductivity of intermediate joint will change only after the joint has damped to a certain extent. The third branch time constant decreases with the increase of moisture degree. This is because the moisture reduces the interface charge migration resistance, which would reduce the interface polarization time. Therefore, the third branch time constant can sensitively reflect the moisture degree of the cable intermediate joint, which can be used as the characteristic parameter to judge the moisture degree of the cable intermediate joint.

PDC test  /  intermediate joint  /  damping ageing  /  polarization and depolarization current  /  DC conductivity  /  third branch time constant
Weiwei LI, Rui ZHANG, Yang LUO, Xiao LEI, Xiaoyan CAO, Yao FU. Study on moisture characteristics of cold shrinkage intermediate joint for distribution cable[J]. Insulating Materials, 2024 , 57 (4) : 60 -65 . DOI: 10.16790/j.cnki.1009-9239.im.2024.04.009
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2024.04.009
  • Receive Date：2023-04-10
  • Online Date：2025-12-22
  • Published：2024-04-20
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History
  • Received：2023-04-10
  • Revised：2023-07-07
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    1Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610072, China
    2School of Electrical Engineering, Sichuan University, Chengdu 610065, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2024.04.009
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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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