<abstract xmlns="http://www.w3.org/1999/xhtml">

Simulation of unsteady flow of SF6 gas in a simplified high-voltage circuit breaker model describing the nozzle, contacts and their nearest surrounding is presented. SF6 is considered as viscous, compressible, real gas described by Redlich-Kwong model. Heat transfer is taken into account due to the gas compressibility. The heat source, triggered by the electric arc between the contacts, was out of the scope of the current research, thus it was not included in the simulations presented. Turbulence, caused by the gas viscosity, is described using realizable <italic>k</italic>-<italic>ε</italic> model. In the simulation model, one of the contact sides – electrodes, is considered as moving at prescribed velocity. The part of the space ‘swept’ by the moving electrode is considered as the gas with imposed artificially increased viscosity in order to imitate the rigid body behaviour. Thus, no moving parts of the computational mesh are used in the model. The conservation equations of mass, momentum and energy, given in integral form, are solved using a finite-volume method on unstructured computational grids.
</abstract>

Simulation of unsteady flow of SF6 gas in a simplified high-voltage circuit breaker model describing the nozzle, contacts and their nearest surrounding is presented. SF6 is considered as viscous, compressible, real gas described by Redlich-Kwong model. Heat transfer is taken into account due to the gas compressibility. The heat source, triggered by the electric arc between the contacts, was out of the scope of the current research, thus it was not included in the simulations presented. Turbulence, caused by the gas viscosity, is described using realizable k-ε model. In the simulation model, one of the contact sides – electrodes, is considered as moving at prescribed velocity. The part of the space ‘swept’ by the moving electrode is considered as the gas with imposed artificially increased viscosity in order to imitate the rigid body behaviour. Thus, no moving parts of the computational mesh are used in the model. The conservation equations of mass, momentum and energy, given in integral form, are solved using a finite-volume method on unstructured computational grids.

On Treatment of Some Physical Properties of Gas in Simulation of High-Voltage SF6 Circuit Breakers

Norwegian university of science and technology – NTNU

Department of Energy and Process Engineering Trondheim

B&H Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

On Treatment of Some Physical Properties of Gas in Simulation of High-Voltage SF Circuit Breakers

Simulation of unsteady flow of SF6 gas in a simplified high-voltage circuit breaker model describing the nozzle, contacts and their nearest surrounding is...

On Treatment of Some Physical Properties of Gas in Simulation of High-Voltage SF₆ Circuit Breakers

Published Online: Jan 14, 2023

Page range: 19 - 24

Received: Sep 02, 2022

Accepted: Dec 09, 2022

DOI: https://doi.org/10.2478/bhee-2022-0009

Keywords
high-voltage circuit breaker (HVCB), gas dynamics, SF6, numerical simulation, computational fluid dynamics (CFD)

© 2022 Muris Torlak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

On Treatment of Some Physical Properties of Gas in Simulation of High-Voltage SF6 Circuit Breakers

Published Online: Jan 14, 2023

Page range: 19 - 24

Received: Sep 02, 2022

Accepted: Dec 09, 2022

DOI: https://doi.org/10.2478/bhee-2022-0009

Keywordshigh-voltage circuit breaker (HVCB), gas dynamics, SF6, numerical simulation, computational fluid dynamics (CFD)

© 2022 Muris Torlak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

On Treatment of Some Physical Properties of Gas in Simulation of High-Voltage SF₆ Circuit Breakers

Keywords
high-voltage circuit breaker (HVCB), gas dynamics, SF6, numerical simulation, computational fluid dynamics (CFD)