SUBSTANTIATION OF THE SELECTION OF FIRE EXTINGUISHING AGENT FOR ELECTRIC CABLES

The fires in cable works are very dangerous and are accompanied by large material damage; therefore their protection by automatic fire suppression systems or by equipment for discharge of fire extinguishing agents is required. In this work the extinguishing process of cables is composed of two stages: the first one consists in the elimination of flaming burning, the second — in the cooling of conductor which usually presents a source of the cable fire and a possible reigniting source. To substantiate the choice of the best and most effective means for the cable extinguishment, the experimental investigation in extinguishment processes is performed, taking into account the emergency cooling process after elimination of the cable wires flaming by use of various fire extinguishing agents. The mathematical model of the conductor cooling in various fire extinguishing media is elaborated. On the base of obtained results, the effectiveness of various fire extinguishing agents are assessed and their efficiency rating for each fire extinguishing stage is obtained. The combined automatic fire suppression system for cable works is developed.