【 Weak current College 】 do electrical equipment for fire prevention

Electrical equipment failure caused by the fire would be unthinkable that sometimes occur "burning even the tablets make a large number of electrical appliances burning, even electric shock accident. Therefore must be carefully analyse the cause of electrical fires occurred. Electrical testing
First, the transformer failure fire prevention measures
The cause of the failure to run due to a severe overload, short circuit coil insulation damage, transformer oil quality aging, connections or tap Office contact resistance is too large, external circuit short-circuit high-voltage fuse failure fuse, core damage and oil arc flashover, lightning, and other causes. As the transformer filled with insulation oil, fire resistance, grave consequences, ranging from injection sparkling, heavy oil is due to the decomposition of internal pressure gasification enables transformer, resulting in a rapid rise, a large number of the shell burst leaking oil combustion. Its preventive measures as:
(1) power transformer should be installed fuse or relay protection equipment, capacity is large it should also be attached to the gas relay to promptly shut off with the power transformer failure.
(2) strengthen insulation monitoring, periodic transformer insulation of preventive tests and maintenance of rotation.
(3) do the insulating oil management, aging, found oil into the water, dielectric strength is not enough, you should make the oil processing or replace qualified new oil.
(4) the transformer should be installed in the outdoor or fire-resistant grade I and II buildings, and should be well ventilated.
(5) strengthen management, often at peak load hours on transformer load monitoring, such as discovery overload should take measures to transfer loads or replaced with a larger capacity of transformer.
(6) to regularly check the arrester is working, the defective product should be replaced in a timely manner.
(7) the application of all-enclosed power transformers, high buildings and places of particular importance, you should use a flame or self-extinguishing properties of dry-type transformers or box-type substation.
2. line fault caused by fire prevention measures
Failure is due to electrical circuit overload, short circuit and connection contact resistance is too large, the line current caused by excessive heat damage to the insulation material of serious fire burning, sometimes occur in the vicinity of electrical discharge, make a fire Tinder. In addition, when you received the wrong line maintenance. For example, 220V 380V circuit circuitry received, or high-voltage line break, a touch in low-voltage lines will cause a fire accident. Its preventive measures are as follows:
(1) to prevent a line of severe overload, according to the circuit on the size of the actual load, reasonably choose wire cross section.
(2) the right to choose automatic circuit breaker or fuse rating, and conductors of safety matches the current carrying capacity, and are not allowed to use copper wire instead of a fuse. The legacy of rubber cover knife switch, high current fuse connections are often difficult to tighten, and arc or spark, is not secure.
(3) the qualified electricians install line, more unusable waste wire privacy la mess. Circuit connectors must be received by the sheath, to make contact with good, put tube conductor to have the connector. Indoor and outdoor wire connection should pack to insulating blanket, is not damaged or exposed.
(4) construction site cable line terminal head and joints are according to specifications, should not be more than the specification length on tall buildings or other important place for people-intensive, use a flame-resistant properties of the cable.
(5) aluminum conductors and electrical equipment outlet and connect with copper and aluminium transition joints, current very little good to touch, to prevent the oxidation of aluminium surface and cause bad contact.
(6) on bare conductors and between live parts and grounding parts between adequate safety distance. Conductors overhead suspension time should not be too loose, so that when the conductor short-circuit in the wind.
3. motor failure fire prevention measures
The cause of the failure is due to the long-run overload, winding insulation damage-turn or white shorts, a phase-three phase motor, motor power mechanical parts failure hinges stuck and motor brush sparks caused by the burning of combustible substances and other reasons, its prevention measures are as follows:
(1) electric motor selection to meet fire safety level, in the wet, dusty environment should use closed-type motor, flammable and explosive environment should use explosion-proof motor.
(2) motor should be installed in non-combustible around the base, should be maintained with combustible lm distance above, and not piling debris.
(3) each motor you must install a separate switch and the right fuse for overload protection, on the larger three-phase motor should be installed to prevent a phase of the two-phase operation of power protection equipment.
(4) strengthen the motor repair and maintenance work on the bearing should always add lubricants, brush to regular replacement, observe if the temperature is too high or there are no spark.
(5) motor starting number should not be too frequent, especially in the hot state the number of continuous starting should not exceed 1-2 times, starting time should not be too long, do not allow long-term overload.
(6) the motor power supply voltage should not be too high or too low, the unusual phenomenon, should be identified, after the motor uses downtime should immediately disconnect the power supply.
4. lighting failure fire prevention measures
The cause of the malfunction is flammable and explosive gas in place due to the installation of lighting fixtures spark-induced fires, Edison lampholders for incandescent lamps, Center tabs when you loose change light bulbs and plugs caused by fire, the connection is not secure loose cause fire, etc., in addition to administer a long wire breakage or when it may cause a fire. Its preventive measures are as follows:
(1) according to the different electricity occasions choose different electric lamps. Flammable and explosive sites should use explosion-proof lamps.
(2) light bulbs and fuel should be maintained between a safe distance, not close to combustibles.
(3) fluorescent lamps should not be immediately installed on combustible ceiling.
(4) household appliances when disabled should pull the plug. At the same time Plug and connect Office applications-welding processes.
(5) select the appropriate protector, and periodic testing.