Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

AC volume breakdown and surface flashover of a 4% NovecTM 4710/96% CO2 gas mixture compared to CO2 in highly nonhomogeneous fields

Nechmi, Houssem Eddine, Slama, Mohammed El Amine, Haddad, Abderrahmane and Wilson, Gordon 2020. AC volume breakdown and surface flashover of a 4% NovecTM 4710/96% CO2 gas mixture compared to CO2 in highly nonhomogeneous fields. Energies 13 (7) , 1710. 10.3390/en13071710

[img] PDF - Published Version
Available under License Creative Commons Attribution.

Download (10MB)

Abstract

AC pre-discharge currents, breakdown, and flashover voltage measurements are reported in a 10 mm needle-plane arrangement in a 4% NovecTM 4710/96% CO2 gas mixture and compared with CO2 for pressures up to 8.8 bar abs. Flashover measurements were performed on different solid dielectrics (Al2O3_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 NovecTM 4710 in CO2 has a breakdown/flashover voltage ≈ 1.14 higher than CO2. 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).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: MDPI
ISSN: 1996-1073
Date of First Compliant Deposit: 6 April 2020
Date of Acceptance: 31 March 2020
Last Modified: 07 Apr 2020 10:00
URI: http://orca-mwe.cf.ac.uk/id/eprint/130861

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics