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Energies 2017, 10(12), 1968; https://doi.org/10.3390/en10121968

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables—An Empirical Study with Defects at Semicon-Dielectric Interface

1
Center for Electromechanics, The University of Texas at Austin, 10100 Burnet Rd CEM Bldg. 133, Austin, TX 78758, USA
2
Electrical Sustainable Energy, Delft University of Technology, Mekelweg 4, Delft 2628 CD, The Netherlands
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 1 October 2017 / Revised: 20 November 2017 / Accepted: 22 November 2017 / Published: 26 November 2017
(This article belongs to the Special Issue Selected Papers from International Workshop of Energy-Open)
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Abstract

A scientific consensus is emerging on the benefits of direct current (DC) distribution in medium voltage (MV) power systems of ships and cities. At least 50% space savings and increased power transfer capacity are estimated with enhanced voltage DC operation of electric cables. The goal of this research is to contribute to developing the empirical knowledge on the insulation performance in order to validate the feasibility of such anticipated gains of DC versus alternating current (AC), and to determine the comparative impact of different operational conditions from a component engineering point of view. The partial discharge (PD) activity in cables is measured under AC and DC conditions as an indicator of insulation performance. Specifically, PDs in defects at the semicon-insulation interface are studied in terms of inception voltage, repetition rate and discharge magnitude. Empirical understanding is drawn for operating voltage and frequency dependence of the discharge behavior in such voids in the range of 10 to 20 kV and 0 to 0.1 Hz, respectively. The change in PD activity with void evolution post temperature-induced ageing process is explored. View Full-Text
Keywords: AC; comparison; DC; discharges; measurements; medium voltage; PD; partial discharges AC; comparison; DC; discharges; measurements; medium voltage; PD; partial discharges
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Shekhar, A.; Feng, X.; Gattozzi, A.; Hebner, R.; Wardell, D.; Strank, S.; Rodrigo-Mor, A.; Ramírez-Elizondo, L.; Bauer, P. Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables—An Empirical Study with Defects at Semicon-Dielectric Interface. Energies 2017, 10, 1968.

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