The design of high-voltage coaxial transmission lines pressurised with pure nitrogen for testing to IEC standards

Waters, Ronald T., Haddad, Manu ORCID: https://orcid.org/0000-0003-4153-6146, Albano, Maurizio ORCID: https://orcid.org/0000-0002-5486-4299 and Michelarakis, Michail ORCID: https://orcid.org/0000-0003-2862-4539 2024. The design of high-voltage coaxial transmission lines pressurised with pure nitrogen for testing to IEC standards. Presented at: 23rd International Symposium on High Voltage Engineering (ISH 2023), Glasgow, UK, 28 August - 1 September 2023. IET Conference Proceedings. , vol.2023 (46) pp. 99-104. 10.1049/icp.2024.0434

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Abstract

The environmental advantages of pure nitrogen as an insulant for metalclad power systems have remained unexploited. It has yet to be shown whether the stringent IEC standards for high pressure gas insulation can be met by nitrogen: it is clear that IEC 62271-203:2022 requires a breakdown voltage which is at least 25% higher than the withstand test voltage and is also 450% above the phase voltage. Nonetheless this paper shows that the limited available test data on large nitrogen coaxialsystems can provide a physical basis to design coaxial systems of optimised conductor/enclosure dimensional ratio (d O/D O= 0.368) that may satisfy IEC specifications for the withstand voltage. These designs use a feasible N2pressure range of 0.5 — 0.8MPa at standard rated line voltages from 33kV to 400kV. Further test data on large systems are urgently needed.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Engineering
Last Modified:	26 Nov 2024 13:46
URI:	https://orca.cardiff.ac.uk/id/eprint/174209

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