AC Volume Breakdown and Surface Flashover of a 4% Novec TM 4710/96% CO 2 Gas Mixture Compared to CO 2 in Highly Nonhomogeneous Fields

Houssem Eddine Nechmi, Mohammed El Amine Slama, Abderrahmane (Manu) Haddad and Gordon Wilson
Additional contact information
Houssem Eddine Nechmi: Advanced High Voltage Engineering Centre, School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, UK
Mohammed El Amine Slama: Advanced High Voltage Engineering Centre, School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, UK
Abderrahmane (Manu) Haddad: Advanced High Voltage Engineering Research Centre, Cardiff University, The Parade, Cardiff CF24 3AA, UK
Gordon Wilson: National Grid House, Warwick Technology Park, Gallows Hill, Warwick CV34 6DA, UK

Energies, 2020, vol. 13, issue 7, 1-22

Abstract: AC pre-discharge currents, breakdown, and flashover voltage measurements are reported in a 10 mm needle-plane arrangement in a 4% Novec TM 4710/96% CO 2 gas mixture and compared with CO 2 for pressures up to 8.8 bar abs. Flashover measurements were performed on different solid dielectrics (Al 2 O 3 _filled epoxy resins, PTFE (Polytetrafluoroethylene) and PE (polyethylene)) for different roughness surface finishes. The effect of fixed conducting needles at various positions on electrical strength is reported. A strong nonlinear behaviour as function of gas pressure was observed for all the studied parameters (gas, needle position, solid insulator, insulator roughness). The non-linear behaviour is attributed to the inception and quenching of glow corona, in the interval between inception and breakdown or flashover voltages. It is found that a 4% concentration of Novec TM 4710 in CO 2 has a breakdown/flashover voltage ≈ 1.14 higher than CO 2 . The glow corona-induced stabilization effect is seen for pressures between 2 and 5 bar abs for all the studied parameters. The peak flashover voltage and its associated pressure of the different insulators are strongly dependent on surface roughness. At 8.8 bar abs, the flashover voltage level obtained with various materials was ordered as follows: PTFE > PE-UHMW > Epoxy > HDPE(High-density polyethylene).

Keywords: Novec TM 4710/CO 2; CO 2; surface discharge; volume discharge; glow corona; surface roughness; Highly non-uniform Electric field; needle position; epoxy resin (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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