Abstract
Arc fault processes can lead to strong damages in gas-insulated switchgears and have to be considered in the development process. In order to reduce test costs, the development of overpressure protection systems can be supported by CFD arc fault simulations. The paper deals with the modelling and simulation of arc fault processes in gas--insulated switchgears. The developed simulation tool takes into account a three-dimensional arc model and the opening of a rupture disc during the arc fault process. The influence of different insulating media as e.g. SF6, Air and CO2 on the arc fault process has been investigated. The simulation model has been validated by measured signals for pressure build-up and arc voltage.
Highlights
Internal arcs in gas–insulated switchgears can lead to strong damages of the switchgears and the surrounding volumes e.g. a substation
The developed CFD arc fault simulation tool that is based on ANSYS® Fluent software doesn’t require an input for the heat transfer coefficient and the arc voltage, as the arc fault process is simulated using a three–dimensional arc model including a sub model describing the radiative transfer inside the arc and from the arc to the surrounding gas
The present paper focuses on the basics of a 3D CFD arc fault simulation tool which can be used in the development of overpressure protection systems for gas–insulated switchgears
Summary
Internal arcs in gas–insulated switchgears can lead to strong damages of the switchgears and the surrounding volumes e.g. a substation. The effects of the respective arc fault process are the pressure increase of the insulating gas and the possible burn–through of the enclosure. The developed CFD arc fault simulation tool that is based on ANSYS® Fluent software doesn’t require an input for the heat transfer coefficient and the arc voltage, as the arc fault process is simulated using a three–dimensional arc model including a sub model describing the radiative transfer inside the arc and from the arc to the surrounding gas. The pressure build–up during the arc fault process can be controlled by the number, location, cross sec-
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