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Energies 2018, 11(10), 2671;

Comparative Study of AC and Positive and Negative DC Visual Corona for Sphere-Plane Gaps in Atmospheric Air

Electrical Engineering, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Spain
Engineering Department, Università Degli Studi del Sannio, Piazza Roma 21, 82100 Benevento, Italy
R&D Department, SBI Connectors España S.A.U., Albert Einstein, 5–7, 08635 Sant Esteve Sesrovires, Spain
Author to whom correspondence should be addressed.
Received: 14 September 2018 / Revised: 2 October 2018 / Accepted: 3 October 2018 / Published: 8 October 2018
(This article belongs to the Section Electrical Power and Energy System)
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Due to the expansion of high-voltage direct current (HVDC) power systems, manufacturers of high-voltage (HV) hardware for alternating current (ac) applications are focusing their efforts towards the HVDC market. Because of the historical preponderance of ac power systems, such manufacturers have a strong background in ac corona but they need to acquire more knowledge about direct current (dc) corona. Due to the complex nature of corona, experimental data is required to describe its behavior. This work performs an experimental comparative analysis between the inception of ac corona and positive and negative dc corona. First, the sphere-plane air gap is analyzed from experimental data, and the corona inception voltages for different geometries are measured in a high-voltage laboratory. Next, the surface electric field strength is determined from finite element method simulations, since it provides valuable information about corona inception conditions. The experimental data obtained are fitted to an equation based on Peek’s law, which allows determining the equivalence between the visual corona surface electric field strength for ac and dc supply. Finally, additional experimental results performed on substation connectors are presented to further validate the previous results by means of commercial high-voltage hardware. The results presented in this paper could be especially valuable for high-voltage hardware manufacturers, since they allow determining the dc voltage and electric field values at which their ac products can withstand free of corona when operating in dc grids. View Full-Text
Keywords: visual corona; direct current; alternating current; finite element method visual corona; direct current; alternating current; finite element method

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Riba, J.-R.; Morosini, A.; Capelli, F. Comparative Study of AC and Positive and Negative DC Visual Corona for Sphere-Plane Gaps in Atmospheric Air. Energies 2018, 11, 2671.

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