Abstract
C5F10O is one of the promising SF6 replacements in power switchgears due to its low global warm potential and high dielectric strength. As Cu metal evaporated by discharges and overheat faults in power switchgears will change the decomposition mechanism and products of C5F10O, the interaction between C5F10O and Cu vapor is important to evaluate the arc-quenching behavior but seldom reported yet. Therefore, this paper is focused on the impacts of Cu vapor, mainly released from the contacts in circuit breakers, on the decomposition mechanism and products of C5F10O. The molecular geometries, harmonic vibrational frequencies, and energetic information of products, reactants, and transition states in C5F10O + Cu decomposition pathways including 19 reactions were calculated by density functional theory. The main decomposition reactions and products were selected based on the analysis of rate constants. This work is hopeful to evaluate the arc-quenching behavior of C5F10O-insulated power equipment considering the evaporation from Cu contacts.
Highlights
Since C5F10O was explored as a promising SF6 replacement to reduce the world’s greenhouse effect with a low global warm potential (GWP),1 its feasibility study as a potential insulation and arcquenching medium in power switchgears has become a hot topic in recent years
C5F10O–CO2 mixtures and found that the main decomposition products above 2600 K are radicals such as CF3, CO, C3F7CO, CF, CF2, C3F7, and CF3.13 Zeng studied the thermal stability characteristics of C5F10O–CO2 mixtures, and the results show that 5% C5F10O–95% CO2 mixtures begin to decompose at about 400 ○C to form C3F8 and C3F6 at 0.2 MPa and the product concentration is in the following order: C3F6 > C3F8 > C2F6 > CF4.14 Xiao studied the effect of trace O2 on the discharge products of C5F10O–N2 and ionization parameters of the decomposition products, and the results show that 12 by-products including CF4, C2F6, C3F8, C4F10, and C5F12 are produced due to the impact of O2 and their ionization parameters are inferior to perfluorocarbons
As Cu vapor generated by discharges and overheat faults in power switchgears will change the decomposition mechanism and products of C5F10O, the interaction between C5F10O and Cu vapor is important to evaluate the arc-quenching behavior
Summary
Since C5F10O was explored as a promising SF6 replacement to reduce the world’s greenhouse effect with a low global warm potential (GWP), its feasibility study as a potential insulation and arcquenching medium in power switchgears has become a hot topic in recent years. Similar to the investigations carried out in SF6, research studies mainly focus on the insulation and arc-quenching properties of C5F10O and its mixture with buffer gases, such as air, CO2, and N2. Sinha calculated the ionization cross sections of C3F6O, C4F8O, C5F10O, C6F12O, and C4F7N plasma with a complex scattering potential-ionization contribution method.. Wang investigated the total electron-impact ionization cross section of C6F12O using the Deutsch–Mark formula, and the results were verified by the calculations of H2O, C3H6O, and C5F10O with the same method.. Wang calculated the electron impact ionization cross sections of C6F12O, C5F10O, C4F7N, and C3F5N with the Binary-Encounter-Bethe (BEB) method, and the results were verified by experiments.. Zhong studied the electron-impact ionization cross sections of promising SF6 replacements such as C2F4H2, C3F4H2, C4F8, C4F7N, C5F10O, and C6F12O using a method combining the Deutsch–Mark formalism and the binary-encounter-Bethe formalism.. Sinha calculated the ionization cross sections of C3F6O, C4F8O, C5F10O, C6F12O, and C4F7N plasma with a complex scattering potential-ionization contribution method. Wang investigated the total electron-impact ionization cross section of C6F12O using the Deutsch–Mark formula, and the results were verified by the calculations of H2O, C3H6O, and C5F10O with the same method. Wang calculated the electron impact ionization cross sections of C6F12O, C5F10O, C4F7N, and C3F5N with the Binary-Encounter-Bethe (BEB) method, and the results were verified by experiments. Zhong studied the electron-impact ionization cross sections of promising SF6 replacements such as C2F4H2, C3F4H2, C4F8, C4F7N, C5F10O, and C6F12O using a method combining the Deutsch–Mark formalism and the binary-encounter-Bethe formalism. Aints investigated the effective ionization coefficient of C5F10O–air mixtures and found that an increasing fraction of C5F10O decreases the effective ionization coefficient. Xiao studied the sensitivity of C4F7N to the electric field and its influence to the environment-friendly insulating gas mixture C4F7N/CO2.7
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