Abstract
C5-PFK (C5F10O), with high dielectric strength and low global warming potential, is the new environmental-friendly potential alternative gases to SF6. In order to reduce its excessively high liquefaction temperature while retaining its excellent properties, a certain amount of buffer gases, such as N2 can be added to it. Therefore, to understand the plasma behavior of under C5F10O-N2 mixtures, the composition, thermodynamic properties and transport properties of the C5F10O-N2 mixtures in a temperature range of 300K to 30000K and a pressure range of 0.1 MPa to 0.8 MPa is calculated under the assumption of local thermodynamic equilibrium. Then, the influence of mixing ratios and pressures are analyzed. The results can be used to determine the optimal proportion of C5F10O-N2 mixtures. Several peaks of the specific heat can be observed below 5000K, which could be a favorable factor for arc quenching.
Highlights
SF6 gas is the most widely used insulation and interruption medium in electric power systems with voltage ratings of 110 kV and above, SF6 gas was included in the restricted six greenhouse gases in the Kyoto Protocol to Global Warming in 1997.1–3 In addition, the Paris Agreement of 2016 explicitly called for achieving zero net greenhouse gas emissions in the second half of this century
Some positive achievements have been made in the research of SF6 alternative gas
Their filling pressures are higher than the SF6 gas circuit breakers, and their volume is about 1.5 to 2 times that of the SF6 circuit breaker
Summary
SF6 gas is the most widely used insulation and interruption medium in electric power systems with voltage ratings of 110 kV and above, SF6 gas was included in the restricted six greenhouse gases in the Kyoto Protocol to Global Warming in 1997.1–3 In addition, the Paris Agreement of 2016 explicitly called for achieving zero net greenhouse gas emissions in the second half of this century. ABB, Toshiba and other large power equipment companies have announced the development of pure CO2-based high-voltage gas circuit breakers, and the current voltage level has reached 145 kV with the breaking capacity of 31.5 kA.. ABB focused on the fluorinated ketone (PFK) gas and its mixtures as insulating or interrupting medium, including C5F10O, C6F12O and CO2, air mixtures.. ABB focused on the fluorinated ketone (PFK) gas and its mixtures as insulating or interrupting medium, including C5F10O, C6F12O and CO2, air mixtures.11,20 This type of gas has a GWP of about 1 with dielectric strength more than twice that of SF6 gas. The calculation of thermophysical parameters of C5F10O and C4F7N and their mixtures is the basis for understanding thermal plasma behavior and applying new potential SF6 substitutes to high voltage electrical equipment. More effort should be paid on non-LTE simulation in the future
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