What is the method of protection against electrical fires? | 04/14/2012 12:22 Requested by: 564421791 | View Count: 685 times I will help him answer the symbol number composition card. You can also enter 9999 words. to submit. If the reference exceeds 50 words, please delete
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Recommended Answer Report|2012-04-14 12:35Choose the fire extinguishing method according to the actual situation.
If it is a domestic electrical fire, dry powder extinguishers and carbon dioxide extinguishers can be used. Be sure to turn off the power when extinguishing the fire to avoid electric shock during the fire extinguishing process.
If it is another type of electrical fire, please refer to the following steps and methods to handle it.
The extinguishing agent must be selected accurately or fixed fire extinguishing devices must be used to extinguish the fire. For large-scale live equipment fires, tactical measures such as power cutoff or actual fire extinguishing should be effectively implemented under the guidance of technical personnel to avoid injury caused by electric shock .
1. Fire Reconnaissance
(1) Understand the location of the fire, whether anyone at the scene of the fire is electrocuted or threatened by the fire, and whether there are flammable, explosive substances and valuables.
(2) Check whether the power supply and switch position of the gate valve have been partially or completely cut off.
(3) Understand the activation status of fixed fire extinguishing devices.
(4) Understand how the fire spreadse, properties of burning materials, extent of fire, route of attack and location of interception positions.
2. Make full use of fixed fire extinguishing devices to extinguish fires. There are mainly three types of fixed fire extinguishing devices used in power plants and electric power systems:
(1) Steam fire extinguishing device. It is usually installed in closed production rooms, oil pump rooms, closed generator rooms, underground pipeline trenches, etc. ; when extinguishing a fire, open the valve on the steam pipe and seal the hole in time; to smother the fire.
(2) Fixed fire extinguishing device “1211”. The device can automatically alert and extinguish the fire in the event of a fire ("1211" is replaced by new extinguishing agents).
(3) Exti deviceFire prevention by water spray.
3. Turn off the power and put out the fire. When conditions permit, the electrical power must be cut off quickly (partially or completely) with the collaboration of the unit's engineering and technical personnel.
(1) For power supplies with ground voltage below 250 V, wear insulating gloves and use insulating scissors to cut the wires.
(2) When cutting off the energized equipment activated by the magnetic switch, the power supply to the equipment should first be cut off (button off), then the cutting knife the switch is disconnected.
(3) When the power distribution room is cut off, the main switch must be turned off first.
4. Hot fire extinguishing
(1) Use carbon dioxide, dry powder and other fire extinguishing equipment to extinguish early equipment fires undervoltage and line.
(2) When extinguishing a fire with electricity, the fire extinguisher must wear insulating rubber boots and gloves and, if necessary, wear an equalization suit tension ; install a ground wire to the metal water gun nozzle using copper wire with; a cross section of 5 to 10 mm2 as grounding wire. Use a steel pipe with a length of more than 1m and a diameter of 50mm or a steel angle of 5O×5Omm as the grounding rod. The wires are firmly connected to the water gun nozzle and the grounding rod respectively. It is best to nail the grounding stake 0.5m into the ground and pour salt water or ordinary water into the grounding stake. In addition, the down conductors of the lightning rod, the iron pipes of tap water, the metal heating pipes, the traction wires of telephone poles,etc. can also be used as grounding equipment. Use copper grills to replace places where ground rods cannot be used, and try using water spray to extinguish fires with electricity. The spray gun does not need to be grounded, but a safe distance from the electrified body must be chosen depending on the voltage. . The pressure of the fire truck pump should be maintained between 0.5 and 0.7 MPa. When directly using a charged water column to extinguish a fire, a large-caliber water gun should be used, and a burst shot should be used to spray water from a long distance to extinguish the fire or to drop the water flow onto the fire point. a parabola shape to increase the length of the water column.
(3) Precautions
1. Keep a safe distance between the gun nozzlet to water and the loaded object.
2. When using a DC water gun to extinguish a fire, if you hear discharge sounds or sparks or feel an electric shock, draw water from a lying position and touch the metal joint between the water hose water and the water gun on the ground to avoid electric shock and injury.
3. In the event of a break in overhead power lines, a warning zone must be designated and no one allowed to enter.
4. Avoid contact between the human body and the water flow.
5. During demolition, prevent tools from coming into contact with live objects.
Reference materials:
The electrical distribution cabinet is a fire caused by objectss on electrified fires and must be equipped with ammonium phosphate dry powder extinguishers, sodium bicarbonate dry powder extinguishers, haloalkane and carbon dioxide extinguishers. fire extinguishers.
In addition, it can be equipped with an automatic heptafluoropropane (HFC-227ea) or mixed gas fire extinguishing system. Heptafluoropropane is a colorless, odorless and low-toxic gas with good insulation and no secondary pollution. It has no depletion potential (ODP) for the atmospheric ozone layer. It is the most ideal substitute for halogenated alkyls 1211 and 1301.
Mixed gas extinguishing agent is a gas mixed with nitrogen, argon and carbon dioxide in a certain proportion. It does not deplete the atmospheric ozone layer and will not affect the Earth's "greenhouse effect." the mixed gas is non-toxic, colorless, odorless, non-corrosive and non-conductive. It does not promote combustion and does not reactt not with most substances. It is an ideal and environmentally friendly extinguishing agent.
Detailed information
Scope of application of heptafluoropropane fire extinguishing system:
The system Heptafluoropropane fire extinguishing is mainly suitable for computer rooms, communications rooms and power distribution room, oil-immersed transformer, stand-alone generator room, booksIt can be used to extinguish electrical fires, fires liquid or fusible solid fires, solid surface fires and gas fires which may cut off the air source before extinguishing the fire.
Application scope of mixed gas extinguishing agent: It can be used to extinguish electrical fires, liquid fires or fusible solid fires, solid surface fires and fires of gas that can cutr the air source before extinguishing the fire. It is mainly suitable for places where people often work, such as electronic computer rooms, communication rooms, power distribution rooms, oil-immersed transformers, stand-alone generator rooms, libraries, archives , museums, invoices and cultural relics databases.
Reference materials:
Baidu Encyclopedia - Automatic fire extinguishing system