Dielectric characteristic of dichlorodifluoromethane (R12) gas and mixture with N ₂ /air as an alternative to SF ₆ gas

Abstract

In this study, dichlorodifluoromethane (R12) gas and mixtures with nitrogen (N 2) and air at different pressures and mixing ratios have been investigated and showed good alternative to SF 6 gas in terms of high-voltage application. Mixed gases contain R12 gas, they offer good dielectric properties and possibility to be used in low-temperature environment. Synergistic effects and self-recoverability test have been performed. Dielectric strength under quasi-uniform field showed in the order of SF 6 > R12 > N 2 > air in alternating current (AC), direct current (DC) and impulse was examined. Mixture R12/N 2 (80/20%) could reach over 0.90-0.95 times to that of SF 6 gas at 50 lb/in 2 at AC and R12/air (70/30%) gives 0.80-0.90 to SF 6 gas. R12 gas presents brilliant self-recoverability. The optimal ratio to switch SF 6 gas is R12/N 2 (80/20%) and R12/air (70/30%) is based on the authors' experimental condition and setup.

Analysis of the dielectric properties of R410A Gas as an alternative to SF 6 for high‐voltage applications

“…The attachment and detachment of electrons depend on the applied field. Equation 1gives relation among dN, N, α, η and dx [8,10].…”

“…The author in [9] has studied R12 gas and air mixture at a band of pressures for the breakdown voltage but analysis was not in detail. In [10], the author has done experimental analysis of R12 gas and Air/N 2 mixture and suggested as an alternative to SF 6 gas. R12 molecules contain fluorine, carbon, and chlorine, which are highly stable, and contributing in the ozone layer destruction.…”

Thermal Compatibility Between Perfluoroisobutyronitrile-CO2 Gas Mixture With Copper and Aluminum Switchgear

“…Sulphur hexafluoride (SF 6 ) is widely used in the electrical industry as insulating and switching medium for medium-voltage (MV) and high-voltage (HV) gas insulated switchgear (GIS) due to its excellent properties of high dielectric strength, nontoxicity, chemical inertness, broad operating temperatures range and exceptional arc quenching properties [1]- [3]. However, SF 6 has the global warming potential (GWP) of 23500 CO 2 equivalents and an atmospheric life span about 3200 years, making it the most potent greenhouse gas (GHG) [4], [5]. It is reported that the current equilibrium warming due to SF 6 is 0.004 • C, with a clear tendency to increase [6].…”

Environment-Friendly and Efficient Gaseous Insulator as a Potential Alternative to SF6

“…It is also non-flammable as compared to the insulating mineral oils particularly for the indoor environments. However, possessing the aforesaid features and properties SF 6 has been regrettably found to be a damaging greenhouse gas stated by the Kyoto Protocol that it is 22,800 times more harmful than CO 2 for the same masses of both the gases over a time span of 100 years [2,3]. Therefore, SF 6 is included in the prohibited list for ecological safety.…”