Methods for arc-flash detection in electrical equipment

Arc-flash protection systems have evolved over the past decade with a range of solutions from arc-resistant gear to circuit breaker temporary instantaneous settings. One technology that has gained acceptance, especially in medium voltage applications is light sensing as applied in arc-flash relays. Recently, arc flash relays have moved into low voltage applications. While light based arc flash relays work well in medium voltage applications, low voltage applications pose reliability challenges. Additionally, in all applications it is desirable to minimize wiring and installation complexity. The authors will describe arc flash detection research and development to address some of these concerns.