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Effects of Trapping Characteristics on Space Charge and Electric Field Distributions in HVDC Cable under Electrothermal Stress

Author

Listed:
  • Fuqiang Tian

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Shuting Zhang

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Chunyi Hou

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

Abstract

Space charge behavior has a strong impact on the long-term operation reliability of high voltage–direct current (HVDC) cables. This study intended to reveal the effect of trap density and depth on the space charge and electric field evolution behavior in HVDC cable insulation under different load currents and voltages by combined numerical bipolar charge transport (BCT) and thermal field simulation. The results show that when the load current is 1800 A (normal value), the temperature difference between the inside and the outside of the insulation is 20 °C, space charge accumulation and electric field distortion become more serious with the increase in the trap depth (E t ) from 0.80 to 1.20 eV for the trap densities (N t ) of 10 × 10 19 and 80 × 10 19 m −3 , and become more serious with the increase in N t from 10 × 10 19 to 1000 × 10 19 m −3 for E t = 0.94 eV. Simultaneously decreasing trap depth and trap density (such as E t = 0.80 eV, N t = 10 × 10 19 m −3 ) or increasing trap depth and trap density (such as E t = 1.20 eV, N t = 1000 × 10 19 m −3 ), space charge accumulation can be effectively suppressed along with capacitive electric field distribution for different load currents (1800 A, 2100 A and 2600 A) and voltages (320 kV and 592 kV). Furthermore, we can draw the conclusion that increasing bulk conduction current by simultaneously decreasing the trap depth and density or decreasing injection current from conductor by regulating the interface electric field via simultaneously increasing the trap depth and density can both effectively suppress space charge accumulations in HVDC cables. Thus, space charge and electric field can be readily regulated by the trap characteristics.

Suggested Citation

  • Fuqiang Tian & Shuting Zhang & Chunyi Hou, 2021. "Effects of Trapping Characteristics on Space Charge and Electric Field Distributions in HVDC Cable under Electrothermal Stress," Energies, MDPI, vol. 14(5), pages 1-22, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:5:p:1313-:d:507643
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    References listed on IDEAS

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    1. Espen Doedens & E. Markus Jarvid & Raphaël Guffond & Yuriy V. Serdyuk, 2020. "Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part I—Experimental Study and Charge Injection Hypothesis," Energies, MDPI, vol. 13(8), pages 1-16, April.
    2. Espen Doedens & E. Markus Jarvid & Raphaël Guffond & Yuriy V. Serdyuk, 2020. "Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part II—Simulations of Charge Transport," Energies, MDPI, vol. 13(7), pages 1-24, April.
    3. Yifan Zhou & Wei Wang & Tailong Guo, 2020. "Space Charge Accumulation Characteristics in HVDC Cable under Temperature Gradient," Energies, MDPI, vol. 13(21), pages 1-17, October.
    4. Yunpeng Zhan & George Chen & Miao Hao & Lu Pu & Xuefeng Zhao & Sen Wang & Jian Liu, 2020. "Space Charge Measurement and Modelling in Cross-Linked Polyethylene," Energies, MDPI, vol. 13(8), pages 1-14, April.
    5. Giuseppe Rizzo & Pietro Romano & Antonino Imburgia & Fabio Viola & Guido Ala, 2020. "The Effect of the Axial Heat Transfer on Space Charge Accumulation Phenomena in HVDC Cables," Energies, MDPI, vol. 13(18), pages 1-18, September.
    6. Sun-Jin Kim & Bang-Wook Lee, 2020. "Numerical Analysis of Space Charge Behavior and Transient Electric Field under Polarity Reversal of HVDC Extruded Cable," Energies, MDPI, vol. 13(11), pages 1-15, June.
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