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Insulation thickness design and verification of ±525 kV DC submarine cable
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Xin KANG1, 2, Yuantao ZHAO2, Feng XIA2, Wu RUAN2, Xiushui MA3, Shuai HOU4
Insulating Materials | 2024, 57(8) : 100 - 107
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Insulating Materials | 2024, 57(8): 100-107
• Insulation Technology •
Insulation thickness design and verification of ±525 kV DC submarine cable
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Xin KANG1, 2, Yuantao ZHAO2, Feng XIA2, Wu RUAN2, Xiushui MA3, Shuai HOU4
Affiliations
  • 1School of Information Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
  • 2Ningbo Oriental Cable Co., Ltd., Ningbo 315801, China
  • 3School of Information Science and Engineering, Ningbo Tech University, Ningbo 315042, China
  • 4Southern Power Grid Scientific Research Institute Co., Ltd., Guangzhou 510663, China
Published: 2024-08-20 doi: 10.16790/j.cnki.1009-9239.im.2024.08.012
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Taking the DC submarine cable in ±525 kV DC transmission project as the research object, we conducted DC voltage withstand test, impact voltage withstand test, and gradient voltage withstand test. The breakdown strength, ageing life index, Bahder's coefficient and other key parameters of the insulation material were analyzed. The insulation thickness of the ±525 kV DC cable under different voltage withstand condition was designed and calculated. The insulation design thickness was calibrated on the basis of the electric field distribution and temperature distribution of DC cable. The results show that the distortion degree of electric field distribution in DC cables is mainly determined by the temperature difference of insulation layer, and the insulation temperature difference is mainly determined by the magnitude of current passing through the cable conductor. Taking into account the research results and the long-term safety and reliability of cable, it is recommended that the insulation thickness of ±525 kV DC cables is designed to be 28 mm.

±525 kV DC submarine cable  /  insulation thickness  /  electric field distribution  /  temperature distribution
Xin KANG, Yuantao ZHAO, Feng XIA, Wu RUAN, Xiushui MA, Shuai HOU. Insulation thickness design and verification of ±525 kV DC submarine cable[J]. Insulating Materials, 2024 , 57 (8) : 100 -107 . DOI: 10.16790/j.cnki.1009-9239.im.2024.08.012
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doi: 10.16790/j.cnki.1009-9239.im.2024.08.012
  • Receive Date：2023-08-25
  • Online Date：2025-12-24
  • Published：2024-08-20
Article Data
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History
  • Received：2023-08-25
  • Revised：2023-11-29
Affiliations
    1School of Information Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
    2Ningbo Oriental Cable Co., Ltd., Ningbo 315801, China
    3School of Information Science and Engineering, Ningbo Tech University, Ningbo 315042, China
    4Southern Power Grid Scientific Research Institute Co., Ltd., Guangzhou 510663, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2024.08.012
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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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