Fire fighting of the hottest electric fire

2022-07-25
  • Detail

Fire fighting of electrical fire

Abstract: fire in power lines or electrical equipment spreads rapidly due to charged combustion. If the fire is not put out properly, it may cause electric shock, expand the fire scope and increase the fire loss

key words: electrical fire electric shock accident transformer oil circuit breaker rotating motor Untitled Document power line or electrical equipment fire, because it is live burning, it spreads rapidly. If the fire fighting is not proper, electric shock may be caused, which will expand the fire scope and increase the fire losses. 1. If the power supply is not cut off in time in case of fire on power lines or electrical equipment after power failure, the body or equipment of the fire-fighting personnel may touch the live parts and cause electric shock accidents. Therefore, after a fire, you should be calm and decisive, try to cut off the power supply, and then organize fire fighting. It should be especially emphasized that when the power supply is not cut off, do not use water for pouring, but use sand or carbon tetrachloride fire extinguishers to put out the fire. Only after the power supply is cut off can water be used to extinguish the fire. The following points shall be paid attention to when cutting off the power supply: (1) after the fire, the insulation strength of the switchgear will be reduced due to moisture or smoke. Therefore, appropriate insulation tools shall be used for switching off. (2) For units with distribution room, the main circuit breaker can be disconnected first; For units without power distribution room, first disconnect the load circuit breaker, and then disconnect the disconnector. (3 China's extruder industry has pointed out the importance of measurement work, and there are many beneficial conditions for foreign trade export). When cutting off the electrical equipment started by the magnetic starter, press the "stop" button first, and then pull off the knife switch. (4) The place where the power supply is cut off shall be properly selected to prevent the fire fighting from being affected after the power supply is cut off. (5) When cutting wires, wear insulating boots and gloves, and cut wires with insulating rubber handle pliers and other conventional Chinese extruders and production line tools. Wires of different phases shall be cut at different parts to avoid short circuit. When cutting wires in the air, the cutting position shall be selected on the support in the direction of power supply to prevent short circuit or electric shock injury caused by falling on the ground after cutting wires. (6) If there is a load on the line, cut off the load first, and then cut off the power supply on the fire extinguishing site. 2. Sometimes it is too late to cut off the power supply in order to buy time and prevent the fire from spreading; Or if the power cannot be cut off due to production needs and other reasons, it is necessary to put out the fire with electricity. The following points shall be paid attention to for live fire extinguishing: (1) select appropriate fire extinguishers. On the premise of ensuring safety, non-conductive extinguishing agents such as carbon dioxide, carbon tetrachloride, "1211", "1301", Hongwei 912 or dry powder fire extinguishers shall be used to extinguish the fire. It should be noted that the extinguishing agent (aqueous solution) of the foam fire extinguisher has certain conductivity and has an impact on the insulation strength of electrical equipment, so it should not be used for live fire extinguishing. (2) When small carbon dioxide, "1211", "1301", dry powder and other fire extinguishers are used to extinguish the fire, due to their short range, there should be a certain safe distance between the human body, the body and nozzle of the fire extinguisher and the charged body. (3) Live fire extinguishing with water. The utility model has the advantages of low price and high fire extinguishing efficiency. However, water can conduct electricity, which may endanger human body when used for live fire extinguishing. Therefore, the fire extinguishing personnel can use the spray water gun to extinguish the fire when they wear insulating gloves and insulating boots and the water gun nozzle is equipped with grounding wire. (4) When putting out fire for aerial equipment such as overhead lines, the elevation angle between the human body position and the live body shall not exceed 45 ℃, so as to avoid personal injury caused by wire breakage. (5) If the live conductor falls off the ground, a warning area shall be marked out to prevent crossing. Fire fighters must wear insulating boots when they need to enter to extinguish the fire. (6) During live fire extinguishing, people shall avoid contact with water flow. (7) Personnel without protective equipment shall not approach the combustion area to prevent electric shock caused by conductive surface water stains. (8) After the fire is extinguished, if the equipment still has voltage, no person shall approach the live equipment and the water stained area. 3 fire fighting of oil filled electrical equipment (1) the oil of oil filled electrical equipment such as transformers, oil circuit breakers, capacitors, etc. most of the flash points are between 130 ~ 140 ℃, which is very harmful. If there is only a local fire outside the container, but the equipment is not damaged, carbon dioxide, carbon tetrachloride, "1211", Hongwei 912, dry powder and other fire extinguishing agents can be used for live fire extinguishing. If the fire is serious, first cut off the power supply of the fire equipment and the threatened equipment, and then put out the fire with water. (2) If the container equipment is damaged, fuel is sprayed and burned, and the fire is very strong, in addition to cutting off the power supply, if there is an accident oil storage pit, try to put the oil into the oil storage pit, and the oil fire in the pit and on the ground shall be extinguished with foam extinguishing agent. (3) Fire oil shall be prevented from flowing into the cable trench. If the burning oil flows into the cable trench and spreads along the trench, the oil fire in the trench can only be extinguished by covering with foam instead of spraying with water to prevent the fire from spreading. (4) During fire extinguishing, sufficient safety distance shall be kept between the fire extinguisher and the live body. When putting out fire with carbon tetrachloride, the fire-fighting personnel should stand in the upwind direction to prevent poisoning, and pay attention to ventilation after putting out the fire. 4 fire fighting of rotating motor when fighting the fire of rotating motor, in order to prevent the deformation of the shaft and bearing of the equipment, it can be rotated slowly. Judge by spraying 7. Sample: after the sample is broken, put out the fire with fog water and make it cool evenly. Carbon dioxide, carbon tetrachloride, "1211" and Hongwei 912 fire extinguishers can also be used to extinguish the fire, but dry powder, sand and soil should not be used to extinguish the fire, so as not to increase the difficulty of repair

Copyright © 2011 JIN SHI