Online measurement of voltage gradient distortion and leakage current of heavily contaminated outdoor insulation using thermal imaging

Albano, M. ORCID: https://orcid.org/0000-0002-5486-4299, Waters, R. T., Slama, M. A. and Haddad, A. ORCID: https://orcid.org/0000-0003-4153-6146 2023. Online measurement of voltage gradient distortion and leakage current of heavily contaminated outdoor insulation using thermal imaging. IEEE Transactions on Dielectrics and Electrical Insulation 10.1109/TDEI.2023.3340985

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Abstract

A new thermal model of an insulator heat loss coefficient proves that evaporation power loss is more significant than thermal conduction to a moist environment. Consequently, the leakage current in a moist pollution layer may cause dry-band formation. Such bands are bridged and sustained by streamer discharges, which can initiate partial arcing. Clean-fog tests of contaminated insulators have been shown to provide infrared temperature data for the model, and the evaluation of voltage gradients in this dry-band regime. The same modelling also offers a unique method of online leakage current monitoring.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Engineering
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	1070-9878
Date of First Compliant Deposit:	8 December 2023
Date of Acceptance:	27 November 2023
Last Modified:	11 Dec 2023 14:14
URI:	https://orca.cardiff.ac.uk/id/eprint/164635

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