Composition of a Thermal Plasma Formed From Ptfe With Copper in Non-Oxidant Atmosphere, Part I: Definition of a Test Case With the Sf6

André, Pascal; Koalaga, Zacharie

doi:10.1615/hightempmatproc.v14.i3.70

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…Chen [10] calculated the compositions of SF 6 /Cu mixtures with non-LTE assumption by combining classical two-temperature mass action law with phase equilibrium condition deduced from the second law of thermodynamics, but the effects of non-LCE were not considered. In order to take both non-LTE and non-LCE into account, the chemical kinetic model is highly recommended by distinguishing the temperature between electrons and heavy particles [11][12][13]. Our previous paper [5] studied the non-equilibrium compositions of an SF 6 decay arc with a two-temperature chemical kinetic model, considering the departures from both thermal and chemical equilibrium, and the results showed more reasonableness by comparing with equilibrium compositions based on Gibbs free energy minimization.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Fu¹,

Wang²,

Yang³

et al. 2018

J. Phys. D: Appl. Phys.

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The compositions of SF 6 arc plasma are contaminated by Cu vapor through electrode erosion and thus affect the performance of the high-voltage SF 6 circuit breaker. But the essential data for chemical kinetic models to study the non-equilibrium compositions of SF 6 /Cu mixtures, namely the decomposition mechanism of SF 6 /Cu mixtures, is still not clear. Besides, SF 6 decomposition products can be used to diagnose insulation faults of GIS and to evaluate the electric life of the SF 6 circuit breaker, but the uncertainty of the decomposition mechanism of SF 6 /Cu mixtures hinders the application of the analysis method of SF 6 decomposition products. Therefore, this work is devoted to investigating the decomposition mechanism of SF 6 /Cu mixtures by means of density functional theory in conjunction with 6-311G(d,p) basis set (for S and F atoms) and Lanl2DZ basis set (for the Cu atom). The optimized molecular structures, harmonic vibrational frequencies and energetic information of reactants, intermediate products (IM), transition states (TS) and products are thoroughly studied. And the complete decomposition pathways of SF 6 /Cu mixtures involving 15 reactions are derived. Detailed potential energy surfaces of SF 6 + Cu decomposition reactions are also depicted as a result. Among all the decomposition pathways, the favorable decomposition reactions of SF 6 + Cu mixtures are found: reaction R1 contributes more than reaction R2 in the decomposition of SF 6 + Cu mixtures due to its lower energy released; reaction R3 is dominant in the decomposition of SF 5 + Cu other than multi-step reactions; the chemical processes of SF 4 + Cu → IM x → TS y (where x stands for 9, 10 and 13, and y denotes 7, 8 and 9) may play the same role in SF 4 + Cu decomposition, but the reaction rate of R6 is higher than other reactions; reaction R9 and R11 are relative favorable among SF 3 + Cu decomposition reactions; reaction R13 is dominant in the decomposition of SF 2 + Cu because of its high potential well. This work hopes to outline a theoretical basis to investigate the non-equilibrium compositions of SF 6 /Cu arc plasma and the SF 6 decomposition products analysis method.

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Section: Introductionmentioning

confidence: 99%

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Fu¹,

Wang²,

Yang³

et al. 2018

J. Phys. D: Appl. Phys.

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“…The thermodynamic properties (mass density, enthalpy, and specific heat at constant pressure) are directly deduced from the plasma compositions. Some results are given in [2][3][4][5][6][7][8][9] and behaviors are explained versus temperature, mixtures and pressure. The transport coefficients (viscosity, thermal and electrical conductivities) are obtained according to the Chapman-Enskog method and a previous calculation of collision integrals depending on the interaction potentials chosen to characterize the different collisions between particles (neutral-neutral, ion-neutral, electron-neutral and charged-charged collisions).…”

Section: No /mentioning

confidence: 99%

“…The transport coefficients (viscosity, thermal and electrical conductivities) are obtained according to the Chapman-Enskog method and a previous calculation of collision integrals depending on the interaction potentials chosen to characterize the different collisions between particles (neutral-neutral, ion-neutral, electron-neutral and charged-charged collisions). The study of the collision integrals constitutes the most important part of the calculation of the transport coefficients and are often responsible for the differences observed between the authors [2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: No /mentioning

confidence: 99%

State of Art and Challenges for the Calculation of Radiative and Transport Properties of Thermal Plasmas in HVCB

Cressault

Teulet

Baumann

et al. 2019

PPT

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This paper is focused on the state-of-the-art and challenges concerning the thermophysical properties of thermal plasmas used in numerical modelling devoted to high voltage circuit breakers. <br />For Local Thermodynamic Equilibrium (LTE) and Non-Local Thermodynamic (NLTE) and/or Chemical Equilibrium (NLCE) plasmas, the methods used to calculate the composition, thermodynamic, transport and radiative properties are presented. <br />A review of these last data is proposed and some comparisons are given for illustrations.

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“…The calculation of the properties of a system S has been widely studied, e.g. in [4][5][6][7][8][9][10][11][12][13]. In [5,6,[11][12][13] S is assumed to be a homogeneous system that contains the gaseous phase alone.…”

Section: Introductionmentioning

confidence: 99%

“…In [5,6,[11][12][13] S is assumed to be a homogeneous system that contains the gaseous phase alone. In [8], the existence of only one condensed species Cu(c) is assumed. The range of the values m is limited in [4,7,9,10].…”

Section: Introductionmentioning

confidence: 99%

Condensed species in products of the reaction of SF₆with Cu up to 4000 K

Coufal¹,

Toman²

2017

J. Phys. D: Appl. Phys.

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This paper is concerned with condensed species in the equilibrium composition of a system of products of the reaction of sulphur hexafluoride with copper. It is assumed that SF6 is an insulation medium in the circuit breaker and reacts with the Cu contained in the circuit breaker contacts or in other parts of the circuit breaker. The system of products of the reaction of SF6 with Cu is assumed to be in local thermodynamic equilibrium for temperatures ranging from ambient temperature to 4000 K, with the pressure in the system being within an interval from 0.1 MPa to 2 MPa. The occurrence of condensed species and their phase transformations significantly affect the composition and thus also the system properties in a range of temperatures at which arc ignition or arc extinction take place. Data on the condensed species considered are analysed and the effects of the phase rule and the selected theoretical model on the occurrence of condensed species in the equilibrium composition are examined.

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Composition of a Thermal Plasma Formed From Ptfe With Copper in Non-Oxidant Atmosphere, Part I: Definition of a Test Case With the Sf6

Cited by 13 publications

References 10 publications

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

State of Art and Challenges for the Calculation of Radiative and Transport Properties of Thermal Plasmas in HVCB

Condensed species in products of the reaction of SF₆with Cu up to 4000 K

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Composition of a Thermal Plasma Formed From Ptfe With Copper in Non-Oxidant Atmosphere, Part I: Definition of a Test Case With the Sf6

Cited by 13 publications

References 10 publications

Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures

Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures

State of Art and Challenges for the Calculation of Radiative and Transport Properties of Thermal Plasmas in HVCB

Condensed species in products of the reaction of SF6with Cu up to 4000 K

Contact Info

Product

Resources

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Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Condensed species in products of the reaction of SF₆with Cu up to 4000 K