A novel approach for Arc-Flash detection and mitigation: At the speed of light and sound

Arc Flash (AF) protection is very important for all power and process industries to maintain safety of personnel at the workplace. As the amount of incident arc flash energy is a function of time, every millisecond counts in the race towards reducing the amount of incident energy to which an individual might be subjected. Since the introduction of the first arc flash detection technology, the ability to dynamically process not only light but also other signatures has become technologically and economically feasible - enabling faster operating times (less than 4 ms). This paper proposes a novel technology which utilizes a unique signature of the light and sound pressure signals during arc-flash within metal clad switchgear/cabling compartments. The detection of light and sound by means of a modern and newly developed sensor technology provides fast, secure, and cost effective protection against arc flash, even for low/load-current arcing events. Furthermore, the extensive laboratory testing is presented considering various scenarios, e.g. distance from the arc, sensor's exposure to the arc, directions between arc and sensor head, and arcing current. The testing results are analyzed and discussed in detail.