Publication detail

Effect of electron attachment on electron concentration in kinetic modelling of SF6-arc plasma

M. Bartlová, O. Coufal

Original Title

Effect of electron attachment on electron concentration in kinetic modelling of SF6-arc plasma

English Title

Effect of electron attachment on electron concentration in kinetic modelling of SF6-arc plasma

Type

conference paper

Language

en

Original Abstract

An electric (switching) arc between separated contacts is an integral part of a switching process. For any kind of high power circuit breakers, the basic mechanism is the extinguishing of the switching arc at the natural current zero by gas convection. The switching arc is responsible for proper disconnecting of a circuit. In the mid and high voltage region, SF6 self-blast circuit breakers are widely used. To obtain optimum properties of the extinction process, mathematical modelling is employed. This approach necessitates good knowledge of the properties of SF6 which are determined by properties of products of its dissociation and ionization. In order to investigate the SF6 circuit breaker arc during extinction process the composition has to be computed by means of chemical kinetics. There are a lot of chemical reactions among species in the dissociated SF6 system. In our previous model of chemical kinetics we have not taken into account reactions of electron attachment. This process is important for reduction of the concentration of free electrons in the system which influences the breaking capacity of the breaker. In this paper we have improved our previous model by reactions of electron attachment to SF6, F2, and F and compared results of both models.

English abstract

An electric (switching) arc between separated contacts is an integral part of a switching process. For any kind of high power circuit breakers, the basic mechanism is the extinguishing of the switching arc at the natural current zero by gas convection. The switching arc is responsible for proper disconnecting of a circuit. In the mid and high voltage region, SF6 self-blast circuit breakers are widely used. To obtain optimum properties of the extinction process, mathematical modelling is employed. This approach necessitates good knowledge of the properties of SF6 which are determined by properties of products of its dissociation and ionization. In order to investigate the SF6 circuit breaker arc during extinction process the composition has to be computed by means of chemical kinetics. There are a lot of chemical reactions among species in the dissociated SF6 system. In our previous model of chemical kinetics we have not taken into account reactions of electron attachment. This process is important for reduction of the concentration of free electrons in the system which influences the breaking capacity of the breaker. In this paper we have improved our previous model by reactions of electron attachment to SF6, F2, and F and compared results of both models.

Keywords

Electric arc, kinetics modelling, reaction rate coefficients, electron attachment

RIV year

2006

Released

31.05.2006

Location

Gdaňsk

Pages from

1

Pages to

4

Pages count

4

BibTex


@inproceedings{BUT19260,
  author="Milada {Bartlová} and Oldřich {Coufal}",
  title="Effect of electron attachment on electron concentration in kinetic modelling of SF6-arc plasma",
  annote="An electric (switching) arc between separated contacts is an integral part of a switching process. For any kind of high power circuit breakers, the basic mechanism is the extinguishing of the switching arc at the natural current zero by gas convection. The switching arc is responsible for proper disconnecting of a circuit. In the mid and high voltage region, SF6 self-blast circuit breakers are widely used. To obtain optimum properties of the extinction process, mathematical modelling is employed. This approach necessitates good knowledge of the properties of SF6 which are determined by properties of products of its dissociation and ionization. In order to investigate the SF6 circuit breaker arc during extinction process the composition has to be computed by means of chemical kinetics. There are a lot of chemical reactions among species in the dissociated SF6 system. In our previous model of chemical kinetics we have not taken into account reactions of electron attachment. This process is important for reduction of the concentration of free electrons in the system which influences the breaking capacity of the breaker. In this paper we have improved our previous model by reactions of electron attachment to SF6, F2, and F and compared results of both models.",
  booktitle="Proceedings of The First Central European Symposium on Plasma Chemistry",
  chapter="19260",
  howpublished="print",
  year="2006",
  month="may",
  pages="1",
  type="conference paper"
}