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Triple point surface discharge photography in atmospheric gases using Intensified high-speed camera system

Michelarakis, M. ORCID:, Clark, D. ORCID:, Widger, P. ORCID:, Beroual, A., Waters, R.T. and Haddad, A. ORCID: 2022. Triple point surface discharge photography in atmospheric gases using Intensified high-speed camera system. IEEE Transactions on Dielectrics and Electrical Insulation 29 (1) , pp. 153-161. 10.1109/TDEI.2022.3148481

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In this paper investigations of surface discharges using an ultraviolet (UV) intensified high-speed camera system are presented, accompanied with high frequency response and resolution current recordings. A needle-plane electrode configuration is employed for the generation of a strongly non-uniform electric field on the surface of disk-shaped insulator samples made of polytetrafluoroethylene (PTFE) or epoxy resin. The electrode arrangement is further insulated by a gaseous medium of either technical air (21% O2/79% N2), nitrogen (N2) or carbon dioxide (CO2). An alternating (AC) voltage waveform at power frequency (50Hz) is maintained at levels sufficiently below the flashover voltage corresponding to each presented case. Detailed descriptions of the technical specifications of the utilised equipment are provided for both optical and electrical measurements in the experimental set-up. The obtained results demonstrate the discharge propagation during the AC-cycle and its dependence on the insulator type and gaseous insulating medium. Individual surface discharges are captured in the microsecond range to describe the discharge morphology based on the generated current pulse and instantaneous applied voltage level. Back-discharges on the insulating disc are also discussed, and a relevant image capture is presented

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers
ISSN: 1070-9878
Date of First Compliant Deposit: 16 March 2022
Date of Acceptance: 17 January 2022
Last Modified: 06 Nov 2023 16:48

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