Partial Discharge Characteristics of C 3 F 7 CN Gas Mixture Using the UHF Method

Loizos Loizou, Qinghua Han, Lujia Chen (), Qiang Liu, Mark Waldron, Gordon Wilson, Roberto Fernandez Bautista and Malcolm Seltzer-Grant
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Loizos Loizou: Department of Electrical & Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK
Qinghua Han: Department of Electrical & Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK
Lujia Chen: Department of Electrical & Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK
Qiang Liu: Department of Electrical & Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK
Mark Waldron: National Grid, Warwick CV34 6DA, UK
Gordon Wilson: National Grid, Warwick CV34 6DA, UK
Roberto Fernandez Bautista: HVPD Ltd., Salford M50 2UW, UK
Malcolm Seltzer-Grant: HVPD Ltd., Salford M50 2UW, UK

Energies, 2022, vol. 15, issue 20, 1-16

Abstract: Manufacturing or assembly defects in gas-insulated equipment can introduce field enhancements that could lead to partial discharge (PD). This paper examines the PD characteristics of SF 6 alternatives considered for potential application to retro-filling existing SF 6 -designed equipment. The PD performance of the C 3 F 7 CN/CO 2 gas mixture and SF 6 were characterised adopting the ultra-high frequency (UHF) method and investigated for different defect configurations, pressures, and gas mediums. Hemispherical rod-plane and plane-to-plane configurations with needle on the high-voltage (HV) and ground electrodes were used to mimic conductor and enclosure protrusion defects, respectively. The results demonstrate that with a needle length of 15 mm, the 20% C 3 F 7 CN/80% CO 2 gas mixture had almost half the partial discharge inception and extinction voltages (PDIV/EV) of SF 6 . For less divergent fields, the 20% C 3 F 7 CN/80% CO 2 gas mixture demonstrated a comparable PDIV/EV performance as SF 6 . The phase-resolved PD patterns of the 20% C 3 F 7 CN/80% CO 2 gas mixture demonstrated a 3-stage transition phase that was not observed with SF 6 , which could be due to the discharge mechanism of the weakly attaching CO 2 gas used within the mixture.

Keywords: partial discharge; phase-resolved partial discharge pattern; gas insulated equipment; ultra-high frequency; sulphur hexafluoride (SF 6 ); 2,3,3,3-tetrafluoro-2-(trifluoromethyl)-propanenitrile (C 3 F 7 CN) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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