Comments on the computation of the composition of quenching media in HV circuit breakers after current zero

Adamec, Ladislav; Coufal, Oldřich

doi:10.1088/0022-3727/30/11/014

Cited by 8 publications

(15 citation statements)

References 5 publications

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“…As many reactions are reversible, the reverse rate constants (r kz ) are obtained with the assistance of the forward rate constant (r k ) and the relative equilibrium constant (K k ) [10]. With the recommendation of Gurvich et al [11], K k is given by…”

Section: Two-temperature Chemical Kinetic Modelmentioning

confidence: 99%

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Dominant Physicochemical Properties of SF6/N2 Thermal Plasmas with a Two-temperature Chemical Kinetic Model

Wang

Gao

Zhong

et al. 2016

PPT

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It's increasingly clear that the existence of thermodynamic equilibrium is an exception rather than the role in SF6/N2 thermal plasmas. We intended to investigate the dominant physicochemical properties of SF6/N2 thermal plasmas at 4 atm from 12000 K to 1000 K with considering the thermal non-equilibrium. A two-temperature chemical kinetic model containing all the available reactions is developed. The temperature difference between the electron and the heavy species is defined as a function of the electron number density. The molar fractions of species are compared to the equilibrium composition predicted by Gibbs free energy minimization. By analyzing the main reactions in the generation and loss of a dominant species, the chemistry set is simplified and characterized by a few species and reactions. Then, the dominant physicochemical properties are captured and the computing time of complicated chemical kinetic model is dramatically shortened at the same time.

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Section: Two-temperature Chemical Kinetic Modelmentioning

confidence: 99%

“…, NF, NS and 80 reactions, with 76 to be reverse ones. The reactions are obtained from the work of Girard et al [13], Adamec et al [11], Teulet et al [14], Woodall et al [15] and Bartlová et al [10] as shown in table 1.…”

Section: Two-temperature Chemical Kinetic Modelmentioning

confidence: 99%

Dominant Physicochemical Properties of SF6/N2 Thermal Plasmas with a Two-temperature Chemical Kinetic Model

Wang

Gao

Zhong

et al. 2016

PPT

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“…All the necessary reaction rate coefficients, temperature dependences and collision cross sections have been compiled from numerous literature references as well as parametric studies. Differently from the initiatory paper by Brand and Kopainsky [3] and works of Gleizes et al [4] and Adamec and Coufal [5], the temperature calculation and the inclusion of electronimpact processes are the new points presented here. In addition to the chemical kinetics, we have also modelled a time-dependent diffusion rather than linking the chemical kinetics to the ideal gas law.…”

Section: Introductionmentioning

confidence: 94%

- circuit-breaker arc modelling around current zero: I. Free-recovery simulation using a collisional-radiative plasma model

Cliteur

Suzuki

Paul

et al. 1999

J. Phys. D: Appl. Phys.

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This paper reports the modelling and initial results of a complete self-consistent physico-chemical model for a SF 6 -N 2 circuit-breaker arc plasma. We calculate the free-recovery temperature decay and species densities in a uniform zero-dimensional space according to a collisional-radiative plasma model in combination with an energy balance for pure SF 6 , pure N 2 and an equimolar mixture of the two. Cooling by radiation, thermal conduction and diffusion is considered by using simple models. Among the vast amount of results, it is found that the electron-removal processes like attachment and recombination in a N 2 plasma are far less efficient than those in a SF 6 plasma. Besides this, heating of the recovering N 2 plasma caused by exothermic associative reactions dominates over cooling. All this indicates a low current-interruption capability when it is applied in gas circuit breakers. In order to estimate this interruption capability we will use this model in combination with Boltzmann analysis to determine whether the arc plasma recovers or re-ignites under the influence of electron-impact processes and the inherent electrical field strength in part II of this paper.

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“…In works on the kinetics of chemical reactions in HV circuit breakers the definition of the rate of reaction is, for reasons unknown, not given. An exception is our earlier article [23], in which definition (12) is given but all the rate constants have been taken over from Brand and Kopainsky [1], where there is no definition of the rate of reaction. From…”

Section: Rate Constantmentioning

confidence: 99%

On kinetics of reactions in HV circuit breakers after current zero

Adamec¹,

Coufal²

1999

J. Phys. D: Appl. Phys.

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An analysis of six different definitions of the rate of reaction is made and it is shown that some of the definitions are not consistent with the mass action law. Kinetic equations are derived whose solution is the time dependence of the composition of an arbitrary closed gaseous system in an ideal state for a given time dependence of temperature on the assumption that either the time dependence of pressure in or the time dependence of the volume of is given. Results are given of the computation of composition of a system of SF6 dissociation and ionization products at a temperature drop from 12 000 K to room temperature and a comparison is made of the time-dependent composition with equilibrium composition for pressures of 0.1, 0.5, 1 and 2 MPa.

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Comments on the computation of the composition of quenching media in HV circuit breakers after current zero

Cited by 8 publications

References 5 publications

Dominant Physicochemical Properties of SF6/N2 Thermal Plasmas with a Two-temperature Chemical Kinetic Model

Dominant Physicochemical Properties of SF6/N2 Thermal Plasmas with a Two-temperature Chemical Kinetic Model

- circuit-breaker arc modelling around current zero: I. Free-recovery simulation using a collisional-radiative plasma model

On kinetics of reactions in HV circuit breakers after current zero

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