Corona-Generated Space Charge Characteristic in an Indoor HVDC Corona Cage Under Atmospheric Temperature Conditions

Jules Simplice Djeumen (), Hendrick Musawenkosi Langa and Trudy Sutherland ()
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Jules Simplice Djeumen: Department of Electrical Engineering, Faculty of Engineering and Technology, Vaal University of Technology, Vanderbijlpark 1900, South Africa
Hendrick Musawenkosi Langa: Department of Electrical Engineering, Faculty of Engineering and Technology, Vaal University of Technology, Vanderbijlpark 1900, South Africa
Trudy Sutherland: Department of Electrical Engineering, Faculty of Engineering and Technology, Vaal University of Technology, Vanderbijlpark 1900, South Africa

Energies, 2025, vol. 18, issue 11, 1-20

Abstract: This study conducted experiments and simulations to examine the DC corona-generated space charge characteristics and understand the performance of high-voltage direct current (HVDC) transmission lines. In experimental studies, various gradient temperatures are tested on a standard model of the potential HVDC transmission line in Southern Africa using an indoor corona cage. Initial tests on the single-line model of aluminium TERN conductors measured the DC corona inception voltages (CIVs) as the ambient temperature increased from 25 °C to 42 °C. A daylight ultraviolet corona camera (CoroCam8) has been used for measurements and visualisation; the measurements record temperatures for positive and negative direct current (DC) voltages. Experimental investigations are supplemented by simulations utilising the finite element method (FEM)-based software COMSOL Multiphysics. Following the creation of 3D models of the corona cage and potential conductor arrangement, the electric field distribution on the surfaces of the conductors was examined. The CIV observations and modelling findings determine the setups’ corona inception electric field strengths. The study effectively integrated experimental data from a corona cage with FEM models to assess DC corona properties across different air temperatures thoroughly. The inception voltage levels of corona are significantly influenced by ambient temperature and the space charge generated by corona. The outcomes of the discussion will inform the design of the proposed HVDC transmission line in Southern Africa.

Keywords: corona discharge; corona inception voltage; electric field; space charge; corona cage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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