Abstract :
In some cases, hot gases generated by internal arc fault are released into the switchgear room, which is subjected to a pressure rise. Pressure development in time and space is studied in this article thanks to a CFD software, for typical AIS switchgear rooms. A focus is made on the room space averaged pressure, which appears to be critical for wall sizing. To derive this result simply, a simplified engineering method is proposed, which can be implemented in an Excel sheet. Dynamic considerations are proposed, as well as order of magnitude of pressure peaks occurring locally in the room.
