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Power Frequency Breakdown Characteristics and Lifetime Model of 500 kV XLPE Submarine Cable Insulation Material under Electro-thermal Stress
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Zhiqian LIU1, 2, Xize DAI1, Jian HAO1, Zhen GAO3, Hanping LI3, Xinlong ZHENG3
Insulating Materials | 2021, 54(2) : 92 - 100
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Insulating Materials | 2021, 54(2): 92-100
• Material Research •
Power Frequency Breakdown Characteristics and Lifetime Model of 500 kV XLPE Submarine Cable Insulation Material under Electro-thermal Stress
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Zhiqian LIU1, 2, Xize DAI1, Jian HAO1, Zhen GAO3, Hanping LI3, Xinlong ZHENG3
Affiliations
  • 1State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University, Chongqing 400044, China
  • 2NR Electric Co., Ltd., Nanjing 211102, China
  • 3State Grid Zhoushan Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd., Zhoushan 316021, China
Published: 2021-02-20 doi: 10.16790/j.cnki.1009-9239.im.2021.02.016
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In order to deeply grasp the breakdown characteristics of AC 500 kV cross-linked polyethylene (XLPE) submarine cable insulation materials under electrical-thermal stress and establish an electrical-thermal combined lifetime model, we conducted electrical-thermal breakdown experiments on the XLPE material at 25, 40, 55, 70℃ under step stress firstly. The AC electric strength and voltage duration time were analyzed by Weibull distribution to obtain the equivalent AC electric strength and voltage duration time at different temperatures. Then the FALLOU, SIMONI, CRINE models were established by multiple linear regression method, and their error was analyzed. Finally, an E-T lifetime model for the AC 500 kV XLPE material was constructed. The results show that at the same temperature, the equivalent electric strength decreases with the increase of voltage duration time of each voltage stage. At the same voltage duration time of each stage, with the increase of temperature, the equivalent AC electric strength and voltage duration time both firstly increase and then decrease. The analysis on the electrical-thermal lifetime models indicate that the fitting error of FALLOU, SIMONI, CRINE models is large, and their fitting goodness do not meet the accuracy requirements. An improved electric-thermal combined ageing lifetime model is obtained by using stepwise regression to calculate the significance and correlation between electric-thermal variables and lifetime, and the error analysis show that it has better fitting accuracy.

submarine cable  /  cross-linked polyethylene (XLPE)  /  step stress  /  insulation properties  /  lifetime model
Zhiqian LIU, Xize DAI, Jian HAO, Zhen GAO, Hanping LI, Xinlong ZHENG. Power Frequency Breakdown Characteristics and Lifetime Model of 500 kV XLPE Submarine Cable Insulation Material under Electro-thermal Stress[J]. Insulating Materials, 2021 , 54 (2) : 92 -100 . DOI: 10.16790/j.cnki.1009-9239.im.2021.02.016
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.02.016
  • Receive Date：2020-04-25
  • Online Date：2026-01-26
  • Published：2021-02-20
Article Data
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History
  • Received：2020-04-25
  • Revised：2020-07-05
Funding
Affiliations
    1State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University, Chongqing 400044, China
    2NR Electric Co., Ltd., Nanjing 211102, China
    3State Grid Zhoushan 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.2021.02.016
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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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