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Experimental and Simulation Studies on Stable Polarity Reversal in Aged HVDC Mass-Impregnated Cables

Author

Listed:
  • Sun-Jin Kim

    (Department of Electronic Engineering, Hanyang University, Ansan 15588, Republic of Korea)

  • Seol Lee

    (Department of Electronic Engineering, Hanyang University, Ansan 15588, Republic of Korea)

  • Woo-Sung Choi

    (Department of Electronic Engineering, Hanyang University, Ansan 15588, Republic of Korea)

  • Bang-Wook Lee

    (Department of Electronic Engineering, Hanyang University, Ansan 15588, Republic of Korea)

Abstract

Mass-impregnated (MI) cables have been used for many years as cables in high-voltage direct current (HVDC) systems. In line commutated converter (LCC) HVDC systems, polarity reversal for power flow control can induce significant electrical stress on MI cables. Furthermore, the mass oil and kraft paper comprising the impregnated insulation have significantly different coefficients of thermal expansion. Load fluctuations in the cable lead to expansion and contraction of the mass, creating pressure within the insulation and causing redistribution of the impregnant. During this process, shrinkage cavities can form within the butt gaps. Since the dielectric strength of the cavities is lower than that of the surrounding impregnation, cavitation phenomena in impregnated paper insulation are considered a factor in degrading insulation performance. Consequently, this study analyzes the electrical conductivity of thermally aged materials and investigates the transient electric field characteristics within the cable. Additionally, it closely analyzes the formation and dissolution of cavities in MI cables during polarity reversal based on a numerical model of pressure behavior in porous media. The conductivity of the impregnated paper indicates that it has excellent resistance to thermal degradation. Simulation results for various load conditions highlight that the interval of load-off time and the magnitude of internal pressure significantly influence the cavitation phenomenon. Lastly, the study proposes stable system operation methods to prevent cavitation in MI cables.

Suggested Citation

  • Sun-Jin Kim & Seol Lee & Woo-Sung Choi & Bang-Wook Lee, 2024. "Experimental and Simulation Studies on Stable Polarity Reversal in Aged HVDC Mass-Impregnated Cables," Energies, MDPI, vol. 17(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:10:p:2352-:d:1393783
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    References listed on IDEAS

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    1. Alassi, Abdulrahman & Bañales, Santiago & Ellabban, Omar & Adam, Grain & MacIver, Callum, 2019. "HVDC Transmission: Technology Review, Market Trends and Future Outlook," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 530-554.
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