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Research on Key Parameters and Its Control of Reinforced Insulation Design for 500 kV DC Cable Joint
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Zongxi LIU1, Lei ZHANG2, Benhong OUYANG1, Peng ZHAO1, Hongjun ZHANG1
Insulating Materials | 2021, 54(12) : 80 - 86
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Insulating Materials | 2021, 54(12): 80-86
• Insulation Technology •
Research on Key Parameters and Its Control of Reinforced Insulation Design for 500 kV DC Cable Joint
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Zongxi LIU1, Lei ZHANG2, Benhong OUYANG1, Peng ZHAO1, Hongjun ZHANG1
Affiliations
  • 1China Electric Power Research Institute Co., Ltd., Wuhan 430072, China
  • 2Zhoushan Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd., Zhoushan 316021, China
Published: 2021-12-20 doi: 10.16790/j.cnki.1009-9239.im.2021.12.013
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The core content of 500 kV DC cable joint design is the performance and geometric structure of reinforced insulation material. In this paper, the electric field distribution characteristics of the main insulation and reinforced insulation double-layer dielectric of the DC cable joint were calculated and simulated. The development mechanism of DC cable joint breakdown caused by interface discharge was analyzed. The breakdown characteristics of the dielectric interface between cross-linked polyethylene (XLPE) and silicone rubber (SR) in DC cable joint were analyzed. The results show that the conductivity of the reinforced insulation and the main insulation of the cable joint and the interface tangential electric field strength are the key parameters of the reinforced insulation design. Within the changing allowance of temperature and electric field, the conductivity of the reinforced insulating material should always be less than that of XLPE. The tangential electric field strength of the interface between the main insulation and the reinforced insulation is the key control parameter affecting the operation reliability of the DC cable joint, and its threshold is 2.5 kV/mm under the most unfavorable conditions. The research results provide a new method to solve the design problems of DC cable joints, especially for the reinforced insulation.

DC cable joint  /  reinforced insulation  /  conductivity matching  /  interface tangential electric field strength  /  DC breakdown characteristics
Zongxi LIU, Lei ZHANG, Benhong OUYANG, Peng ZHAO, Hongjun ZHANG. Research on Key Parameters and Its Control of Reinforced Insulation Design for 500 kV DC Cable Joint[J]. Insulating Materials, 2021 , 54 (12) : 80 -86 . DOI: 10.16790/j.cnki.1009-9239.im.2021.12.013
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.12.013
  • Receive Date：2021-01-29
  • Online Date：2026-03-23
  • Published：2021-12-20
Article Data
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History
  • Received：2021-01-29
  • Revised：2021-03-11
Funding
Affiliations
    1China Electric Power Research Institute Co., Ltd., Wuhan 430072, China
    2Zhoushan Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd., Zhoushan 316021, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2021.12.013
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Citations
表12种不同金属材料的力学参数
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Number of
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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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