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Empirical Conductivity Equation for the Simulation of the Stationary Space Charge Distribution in Polymeric HVDC Cable Insulations

Author

Listed:
  • Christoph Jörgens

    (Chair of Electromagnetic Theory, School of Electrical, Information and Media Engineering, University of Wuppertal, 42119 Wuppertal, Germany)

  • Markus Clemens

    (Chair of Electromagnetic Theory, School of Electrical, Information and Media Engineering, University of Wuppertal, 42119 Wuppertal, Germany)

Abstract

Many processes are involved in the accumulation of space charges within the insulation materials of high voltage direct current (HVDC) cables, e.g., the local electric field, a conductivity gradient inside the insulation, and the injection of charges at both electrodes. An accurate description of the time dependent charge distribution needs to include these effects. Furthermore, using an explicit Euler method for the time integration of a suitably formulated transient model, low time steps are used to resolve fast charge dynamics and to satisfy the Courant–Friedrichs–Lewy (CFL) stability condition. The long lifetime of power cables makes the use of a final stationary charge distribution necessary to assess the reliability of the cable insulations. For an accurate description of the stationary space charge and electric field distribution, an empirical conductivity equation is developed. The bulk conductivity, found in literature, is extended with two sigmoid functions to represent a conductivity gradient near the electrodes. With this extended conductivity equation, accumulated bulk space charges and hetero charges are simulated. New introduced constants to specify the sigmoid functions are determined by space charge measurements, taken from the literature. The measurements indicate accumulated hetero charges in about one quarter of the insulation thickness in the vicinity of both electrodes. The simulation results conform well to published measurements and show an improvement to previously published models, i.e., the developed model shows a good approximation to simulate the stationary bulk and hetero charge distribution.

Suggested Citation

  • Christoph Jörgens & Markus Clemens, 2019. "Empirical Conductivity Equation for the Simulation of the Stationary Space Charge Distribution in Polymeric HVDC Cable Insulations," Energies, MDPI, vol. 12(15), pages 1-14, August.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:15:p:3018-:d:254997
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    Citations

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    Cited by:

    1. Ioannis F. Gonos & Issouf Fofana, 2020. "Special Issue “Selected Papers from the 2018 IEEE International Conference on High Voltage Engineering (ICHVE 2018)”," Energies, MDPI, vol. 13(18), pages 1-5, September.
    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.

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