An Experimental Study of Circuit-Breaker Arcs in Nozzles under Clogged Conditions

This paper describes an experimental investigation of airblast arcs in nozzles under clogged conditions. From a suitable computer model of the air supply system and by the use of approximately flat current pulses of sufficiently long duration of nearly 18 ms, the clogging current as well as the reversed rate of flow energy from the nozzle to the upstream chamber under overclogged conditions have been determined. Theoretical scaling law for the clogging current [2] has been verified for upstream pressures in the range of 5-13 bar using three-nozzle geometries.