Effect of Roof Height on Internal Arc Testing of Switchgear Panels

The market requirements for Medium Voltage (MV) metal enclosed switchgear are getting more and stringent. Bothbuilding costs as well the level of transmitted distributed electrical power have increased rapidly over recentyears expected to continue rise. This means that manufacturers must bring compactand powerful systems on market, while being simultaneously cost effective possible. Internal Arc Classification(IAC) according IEC IEEE standards is one most important guaranteesafety in case internal arc faults. arcs cause a sudden pressure rise installations. leads anextreme stress acting compartments rooms could collapse buildingsThis paper describes few design rules innovations, which were necessary achieve best results duringinternal tests. Furthermore it demonstrates effect roof height during test with casestudies. Finally solution eliminate also proposed.