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Defect detection technology of XLPE high voltage cable fusion joint
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Sanwei LIU1, Xiaoli DUAN1, Fuyong HUANG1, Jie XIONG2, Jianjia DUAN1, Zeyu ZENG1, Ting YU1
Insulating Materials | 2023, 56(4) : 100 - 105
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Insulating Materials | 2023, 56(4): 100-105
• Test and Analysis •
Defect detection technology of XLPE high voltage cable fusion joint
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Sanwei LIU1, Xiaoli DUAN1, Fuyong HUANG1, Jie XIONG2, Jianjia DUAN1, Zeyu ZENG1, Ting YU1
Affiliations
  • 1Electric Power Research Institute, State Grid Hunan Electric Power Co., Ltd., Changsha 410000, China
  • 2Changde Power Supply Company, State Grid Hunan Electric Power Co., Ltd., Changde 415000, China
Published: 2023-04-20 doi: 10.16790/j.cnki.1009-9239.im.2023.04.016
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High voltage cable fusion joint with defects operating for a long time is easy to cause operation failure. In order to timely troubleshoot the joint defects, we taked high-voltage cable fusion joints as research object. The main insulation and conductor recovery process of high-voltage cable fusion joint was detected by digital radiography (DR) technology, and the bending limit of conductors was analyzed by finite element method. The results show that the DR detection technology can effectively detect bubbles, conductor bending, eccentricity and other defects in the XLPE main insulation of fusion joint. The accuracy of detection results is demonstrated by field dissection, which provides an effective means for the defect detection of high voltage cable fusion joint. The bubble defect of XLPE main insulation is caused by the decrease of temperature and nitrogen pressure in the crosslinked pipeline. Considering the safety margin of the joint, it is recommended that the bending gap should not exceed 11 mm and the insulation thickness at the bending position should not be less than 30 mm.

HV cable fusion joint  /  XLPE main insulation  /  DR digital ray detection  /  micro defects
Sanwei LIU, Xiaoli DUAN, Fuyong HUANG, Jie XIONG, Jianjia DUAN, Zeyu ZENG, Ting YU. Defect detection technology of XLPE high voltage cable fusion joint[J]. Insulating Materials, 2023 , 56 (4) : 100 -105 . DOI: 10.16790/j.cnki.1009-9239.im.2023.04.016
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Year 2023 volume 56 Issue 4
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2023.04.016
  • Receive Date：2022-04-12
  • Online Date：2025-11-21
  • Published：2023-04-20
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History
  • Received：2022-04-12
  • Revised：2022-05-24
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Affiliations
    1Electric Power Research Institute, State Grid Hunan Electric Power Co., Ltd., Changsha 410000, China
    2Changde Power Supply Company, State Grid Hunan Electric Power Co., Ltd., Changde 415000, China
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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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