Internal Arc Test of MV Switchgear by Mayur Panchal

The international market for medium voltage switchgear (both AIS & GIS) for primary & secondary electrical distribution places high requirements with respect to reliability of operation and safety. In spite of continuing optimization of such switchgear and control gear, it is unavoidable that failures still occur during operation. While the probability of occurrence of an internal arc in metal enclosed medium voltage switchgear during its service life is relatively low, it cannot be completely disregarded. This presentation explains the relevant testing procedure as well as its various key elements including test set-up, type of accessibility, evaluation criteria and additional requirements as per the latest edition of IEC 62271-200; Ed.3; 2021.