Alternative methods for internal arc tests on 12 kV and 24 kV metal-enclosed switchgears with compact RMU

Abstract

Arcing due to an internal arc fault test is carrying out in order to demonstrate the capability of the metal-enclosed switchgear to withstand to stresses generate by electric arc. Firstly, it is aimed the limitation of the destructive effects of the enclosures and protection of the persons near the metal-enclosed switchgear. The behaviour of the metal-enclosed switchgear during the test is pointed out by video recordings, which lead to the evaluation of the test result together with the observations stated after test on metal-enclosed switchgear and indicators also. The paper presents two alternative methods for verification at electric arc action of metal-enclosed switchgears according to international standards.