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Electric Field Distribution in HVDC Cable Joint in Non-Stationary Conditions

Author

Listed:
  • Thi Thu Nga Vu

    (Faculty of Electrical Engineering, Electric Power University, 235 Hoang Quoc Viet, Hanoi 10000, Vietnam)

  • Gilbert Teyssedre

    (Laboratory on Plasma and Conversion of Energy, University of Toulouse and CNRS, 118 Route de Narbonne, 31062 Toulouse, France)

  • Séverine Le Roy

    (Laboratory on Plasma and Conversion of Energy, University of Toulouse and CNRS, 118 Route de Narbonne, 31062 Toulouse, France)

Abstract

Accessories such as joints and terminations represent weak points in HVDC cable systems. The DC field distribution is intimately dependent on the thermal conditions of the accessory and on material properties. Moreover, there is no available method to probe charge distribution in these conditions. In this work, the field distribution in non-stationary conditions, both thermally and electrically, is computed considering crosslinked polyethylene (XLPE) as cable insulation and different insulating materials (silicone, rubber, XLPE) for a 200 kV joint assembled in a same geometry. In the conditions used, i.e., temperatures up to 70 °C, and with the material properties considered, the dielectric time constant appears of the same order or longer than the thermal one and is of several hours. This indicates that both physical phenomena need to be considered for modelling the electric field distribution. Both the radial and the tangential field distributions are analysed, and focus is given on the field distribution under the stress cone on the ground side and near the central deflector on the high voltage side of the joint. We show that the position of the maximum field varies in time in a way that is not easy to anticipate. Under the cone, the smallest tangential field is obtained with the joint insulating material having the highest electrical conductivity. This results from a shift of the field towards the cable insulation in which the geometrical features produce a weaker axial component of the field. At the level of the central deflector, it is clear that the tangential field is higher when the mismatch between the conductivity of the two insulations is larger. In addition, the field grows as a function of time under stress. This work shows the need of precise data on materials conductivity and the need of probing field distribution in 3D.

Suggested Citation

  • Thi Thu Nga Vu & Gilbert Teyssedre & Séverine Le Roy, 2021. "Electric Field Distribution in HVDC Cable Joint in Non-Stationary Conditions," Energies, MDPI, vol. 14(17), pages 1-17, August.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5401-:d:625539
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    References listed on IDEAS

    as
    1. Yi Luo & Zhengyi Han & Mingyu Zhou & Haitian Wang, 2020. "A Sophisticated Method of the Mechanical Design of Cable Accessories Focusing on Interface Contact Pressure," Energies, MDPI, vol. 13(11), pages 1-16, June.
    2. Christoph Jörgens & Markus Clemens, 2020. "A Review about the Modeling and Simulation of Electro-Quasistatic Fields in HVDC Cable Systems," Energies, MDPI, vol. 13(19), pages 1-42, October.
    3. Yvonne Späck-Leigsnering & Greta Ruppert & Erion Gjonaj & Herbert De Gersem & Myriam Koch, 2021. "Towards Electrothermal Optimization of a HVDC Cable Joint Based on Field Simulation," Energies, MDPI, vol. 14(10), pages 1-13, May.
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    Cited by:

    1. Yani Wang & Shuai Zhang & Yuanyuan Sun & Xingwu Yang & Chun Liu, 2022. "Effect of Nano-MgO Doping in XLPE on Charge Transport and Electric Field Distribution in Composite Insulation of HVDC Cable Joint," Energies, MDPI, vol. 15(19), pages 1-17, September.
    2. Zbigniew Nadolny, 2022. "Electric Field Distribution and Dielectric Losses in XLPE Insulation and Semiconductor Screens of High-Voltage Cables," Energies, MDPI, vol. 15(13), pages 1-14, June.
    3. Rodolfo Araneo & Salvatore Celozzi & Stefano Lauria & Erika Stracqualursi & Gianfranco Di Lorenzo & Marco Graziani, 2022. "Recent Trends in Power Systems Modeling and Analysis," Energies, MDPI, vol. 15(23), pages 1-7, December.
    4. Paweł Mikrut & Paweł Zydroń, 2023. "Numerical Modeling of PD Pulses Formation in a Gaseous Void Located in XLPE Insulation of a Loaded HVDC Cable," Energies, MDPI, vol. 16(17), pages 1-21, September.

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