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Study on different scales of defects in XLPE based on terahertz time-domain spectroscopy
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Ze LIAN1, Xinyu LI2, Hua YU1, Yang FENG2, Shengtao LI2
Insulating Materials | 2024, 57(4) : 100 - 108
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Insulating Materials | 2024, 57(4): 100-108
• Test and Analysis •
Study on different scales of defects in XLPE based on terahertz time-domain spectroscopy
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Ze LIAN1, Xinyu LI2, Hua YU1, Yang FENG2, Shengtao LI2
Affiliations
  • 1Electric Power Research Institute of State Grid Shanxi Electric Power Corporation, Taiyuan 030001, China
  • 2State Key Laboratory of Electrical Insulation and Power Equipment, Xi′an Jiaotong University, Xi′an 710049, China
Published: 2024-04-20 doi: 10.16790/j.cnki.1009-9239.im.2024.04.014
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Cross-linked polyethylene (XLPE) is subject to various environmental or human factors during production, laying, and operation, which can generate structural defects at different scales and affect the electrical performance of XLPE. In this paper, the molecular defects, aggregated structural defects, and macroscopic air gap defects in XLPE power cables were reconstructed and characterized by X-ray Diffraction (XRD) and transmission and reflection modules of terahertz time-domain spectroscopy (THz-TDS). The results show that the amplitude and phase information of terahertz time-domain spectroscopy exhibit sensitive to the structural changes of polar molecules and aggregates, respectively. The location and size of hidden air gap defects can be accurately identified and calculated by the combined technique of transmission and reflection modules of terahertz time-domain spectroscopy, realizing the nondestructive detection of defects at different scales.

cross-linked polyethylene  /  terahertz time domain spectroscopy  /  defects  /  nondestructive testing
Ze LIAN, Xinyu LI, Hua YU, Yang FENG, Shengtao LI. Study on different scales of defects in XLPE based on terahertz time-domain spectroscopy[J]. Insulating Materials, 2024 , 57 (4) : 100 -108 . DOI: 10.16790/j.cnki.1009-9239.im.2024.04.014
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2024.04.014
  • Receive Date：2023-04-11
  • Online Date：2025-12-22
  • Published：2024-04-20
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  • Received：2023-04-11
  • Revised：2023-07-07
Funding
Affiliations
    1Electric Power Research Institute of State Grid Shanxi Electric Power Corporation, Taiyuan 030001, China
    2State Key Laboratory of Electrical Insulation and Power Equipment, Xi′an Jiaotong University, Xi′an 710049, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2024.04.014
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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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