Investigation on critical breakdown electric field of hot carbon dioxide for gas circuit breaker applications

Sun, H.; Rong, Mingzhe; Wu, Yi; Chen, Zhexin; Yang, Fei; Murphy, Anthony B.; Zhang, Hantian

doi:10.1088/0022-3727/48/5/055201

Cited by 25 publications

(29 citation statements)

References 49 publications

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“…The sets for CO 2 , N 2 , O 2 , which are from the data base www.lxcat.net, are validated by the comparisons between our calculation and the previous experimental data. For the cross section sets for CO, although there is no experimental data for comparison yet, the validity was confirmed in our previous work [17] by comparing with the results by Stroller [8] . As to CF 4 , the cross section sets are from Kurihara et al [12] .…”

Section: Fundamental Datasupporting

confidence: 75%

Investigation on the Dielectric Properties of CO₂and CO₂-Based Gases Based on the Boltzmann Equation Analysis

Sun

Rong

et al. 2016

Plasma Sci. Technol.

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In this paper, the dielectric properties of CO2, CO2/air, CO2/O2, CO2/N2, CO2/CF4, CO2/CH4, CO2/He, CO2/H2, CO2/NH3 and CO2/CO were investigated based on the Boltzmann equation analysis, in which the reduced critical electric field strength (E/N)cr of the gases was derived from the calculated electron energy distribution function (EEDF) by solving the Boltzmann transport equation. In this work, it should be noted that the fundamental data were carefully selected by the published experimental results and calculations to ensure the validity of the calculation. The results indicate that if He, H2, N2 and CH4, in which there are high ionization coefficients or a lack of attachment reactions, are added into CO2, the dielectric properties will decrease. On the other hand, air, O2, NH3 and CF4 (ranked in terms of (E/N)cr value in increasing order) have the potential to improve the dielectric property of CO2 at room temperature.

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Section: Fundamental Datasupporting

confidence: 75%

Investigation on the Dielectric Properties of CO₂and CO₂-Based Gases Based on the Boltzmann Equation Analysis

Sun

Rong

et al. 2016

Plasma Sci. Technol.

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“…The formation of an electron avalanche is determined by the balance of the generation and loss processes of electrons, and requires that the effective ionization coefficient is greater than zero [8]. Ionization contributes to the generation of electrons while attachment contributes to the loss of electrons.…”

Section: B Eedf and Reaction Coefficientsmentioning

confidence: 99%

Investigation on the reduced critical breakdown field of hot CO2 gas and CO2-based mixtures

Chen

Niu

Zhang

et al. 2015

2015 3rd International Conference on Electric Power Equipment – Switching Technology (ICEPE-ST)

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Sulfur hexafluoride (SF 6 ) gas is widely used in highvoltage circuit breakers (HVCB) but due to its high global warming potential, substitutes are being sought. CO 2 has been investigated as a candidate based on its arc interruption performance and has been used in some practical products. However, at room temperature its dielectric properties is inferior to both SF6 and air. The goal of this work is to investigate the reduced critical breakdown fields of the hot CO 2 and CO 2 -based mixtures, i.e., CO 2 , CO 2 /O 2 , CO 2 /CH 4 , CO 2 /He and CO 2 /N 2 . In this paper, the dielectric properties of hot gases were investigated at elevated temperatures. The point that the fundamental data for this calculation, which are the electron scattering cross sections, should be carefully selected is stressed in this paper. The data used in present calculation were validated by the published experimental results and calculations. Then species compositions of hot gases were obtained based on Gibbs free energy minimization. The reduced critical electric field strength (E/N)cr of gases was derived from the calculated electron energy distribution function (EEDF) by solving the Boltzmann transport equation. The results show that the admixture of O 2 and CH 4 leads higher reduced critical breakdown field, which makes these two mixtures have the potential to further improve the dielectric properties of the CO 2 in the practical use.

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“…In the condition of a lower temperature below 1500 K, it improves with decreasing temperature, which is attributed to the increasing ratio of electronegative gases CF 4 and I 2 . The EEDFs at 1500 K to 2000 K reach the minimum because of the highest fraction of electronegative particles, which effectively hinders the drifting motion of electrons [30] . Thus the residual 30% CF 3 I/CO 2 gas mixtures are estimated to have the best electrical property and insulation strength at the temperature between 1500 K and 2000 K.…”

Section: The Dielectric Breakdown Field Strength At Different Temperamentioning

confidence: 99%

Breakdown Electric Field of Hot 30% CF₃I/CO₂Mixtures at Temperature of 300–3500 K During Arc Extinction Process

Zhao

Jiao

Xiao

2016

Plasma Sci. Technol.

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We calculated the uniform dielectric breakdown field strength of residual 30% CF3I/CO2 gas mixtures during the arc extinction process over the temperature range 300-3500 K at 0.1 MPa. The limiting reduced field strengths are decided by a balance of electron generation and loss based on chemical reactions estimated by the electron energy distribution function (EEDF), which employs the Boltzmann equation method with two-term expanding approximation in the steady-state Townsend (SST) condition. During the insulation recovery phase, the hot CF3I/CO2 gas mixtures have maximum dielectric strength at a temperature of about 1500 K. At room temperature 300 K, the electric strength after arc extinction (90.3 Td, 1 Td=10 −21 V·m 2 ) is only 38% of the original value before arc (234.9 Td). The adverse insulation recovery ability of CF3I/CO2 gas mixtures in arc extinction hinders its application in electric circuit breakers and other switchgears as an arc quenching and insulating medium.

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Investigation on critical breakdown electric field of hot carbon dioxide for gas circuit breaker applications

Cited by 25 publications

References 49 publications

Investigation on the Dielectric Properties of CO₂and CO₂-Based Gases Based on the Boltzmann Equation Analysis

Investigation on the Dielectric Properties of CO₂and CO₂-Based Gases Based on the Boltzmann Equation Analysis

Investigation on the reduced critical breakdown field of hot CO2 gas and CO2-based mixtures

Breakdown Electric Field of Hot 30% CF₃I/CO₂Mixtures at Temperature of 300–3500 K During Arc Extinction Process

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Investigation on critical breakdown electric field of hot carbon dioxide for gas circuit breaker applications

Cited by 25 publications

References 49 publications

Investigation on the Dielectric Properties of CO2and CO2-Based Gases Based on the Boltzmann Equation Analysis

Investigation on the Dielectric Properties of CO2and CO2-Based Gases Based on the Boltzmann Equation Analysis

Investigation on the reduced critical breakdown field of hot CO2 gas and CO2-based mixtures

Breakdown Electric Field of Hot 30% CF3I/CO2Mixtures at Temperature of 300–3500 K During Arc Extinction Process

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Investigation on the Dielectric Properties of CO₂and CO₂-Based Gases Based on the Boltzmann Equation Analysis

Investigation on the Dielectric Properties of CO₂and CO₂-Based Gases Based on the Boltzmann Equation Analysis

Breakdown Electric Field of Hot 30% CF₃I/CO₂Mixtures at Temperature of 300–3500 K During Arc Extinction Process