Polarity reversal effect on partial discharge performance of different dielectric materials for aerospace applications

Mavidou, Sofia P. ORCID: https://orcid.org/0000-0001-8049-7392, Michelarakis, Michail ORCID: https://orcid.org/0000-0003-2862-4539, Clark, David ORCID: https://orcid.org/0000-0002-1090-2361, Stone, Christopher and Haddad, A. Manu ORCID: https://orcid.org/0000-0003-4153-6146 2024. Polarity reversal effect on partial discharge performance of different dielectric materials for aerospace applications. Presented at: 23rd International Symposium on High Voltage Engineering (ISH 2023), Glasgow, UK, 28 August 2024. Proceedings 23rd International Symposium on High Voltage Engineering. IET, pp. 1066-1071. 10.1049/icp.2024.0761

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Abstract

Aeronautical conditions and increasing power demand bring challenges to the electrification of aircraft concept. Electrical systems should be designed to operate under extreme environmental conditions and high electrical stresses. To improve system reliability, the electrical performance of insulation within the aircraft must be specified to withstand those stresses and conditions. For the next generation aircraft, the energy sources will likely deliver direct current and therefore, dc grid structures are mainly considered by aircraft manufacturers. Partial Discharge mechanisms and insulation performance have different behaviour under ac and dc voltages. Polarity reversal during operation imposes high electric stress on the insulation material. For High Voltage Direct Current cables, there are polarity reversal strategies and defined polarity reversal periods. However, cables that are designed for aerospace applications operate under completely different environmental conditions and those strategies must be revised accordingly. In this work, a systematic study shows the effect of polarity reversal on partial discharge activity. Different insulation materials have been tested under variable sub-atmospheric pressure corresponding to different flight altitudes. The partial discharge performance of these materials is examined for various slew rates changing from one polarity to the other at the proposed operating voltages.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	IET
ISBN:	978-1-83953-992-3
Last Modified:	04 Oct 2024 15:03
URI:	https://orca.cardiff.ac.uk/id/eprint/172305

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