Performance characteristics of explosion-proof transformer for mining

Yawei Transformer is mainly engaged in the production and sales of mine explosion-proof mobile transformer, mine explosion-proof dry transformer, mine transformer, explosion-proof transformer, mine mobile transformer, mine explosion-proof mobile transformer, mine explosion-proof mobile transformer, mine explosion-proof dry transformer. Explosion-proof transformer, as the name suggests, can avoid the transmission of explosive fire, explosion-proof transformer belongs to one of the mine transformers. The following are some characteristics of explosion-proof transformers. Performance description: 1, flameproof structure flameproof structure of electrical equipment in the explosion risk area is very common. It can not only avoid the transmission of explosive fire, but also the shell can withstand the inevitable overpressure. Under normal conditions, the shell can accept the impact effect of 1.5 times the practical explosion pressure without damage and without permanent deformation. Flameproof electrical equipment used in coal mines should be consolidated. Because the use of the situation is very vicious, the electrical equipment is knocked against the phenomenon is extremely severe, so the body strength is required to have a larger safety factor. Generally made of steel plate and cast steel material. The flameproof structure of large rotating motors using plain bearings cannot be used in areas with grade 3 and grade 4 explosive substances. If the special structure is accepted, it can also be used by legal inspection authorities. 2, increased safety structure Increased safety structure is widely used in explosion-proof electrical equipment. Such as electric motors, transformers, lamps and electrical equipment with inductors. The general requirement is that the temperature rise of the insulated winding should be 10 ° C lower than the temperature rise of the specification rules of other explosion-proof electrical equipment. The leakage interval and the electrical gap should be as large as possible, and the small value should not be lower than the relevant rules. The shell must have a necessary protection method and can meet the IP54 protection requirements of GB1498-79 rules. The motor agrees to block the time tE for not less than 5 seconds, and the ratio of the starting current to the additional current shall not exceed 10 times. The temperature rise during the plugging time shall not be capable of igniting explosive inclusions or destroying insulation. The test voltage between turns of insulated winding and to ground must be improved compared with that of popular electrical equipment. The low-voltage equipment has improved by 10%, and the high-voltage equipment has improved by 30%, and the connection of all conductors is required to be reliable, and under the influence of overload vibration, poor contact should not occur. Increased safety electrical equipment, although it can be used safely in a group of higher explosion risk situations, but when a number of internal components are faulty, it can not guarantee the safety of explosion-proof, so we must carefully consider the use of conditions, maintenance and management and other premises, and then determine whether it is suitable. The selection of increased safety motor, transformer, etc., must be equipped with responsive overload maintenance installation or overheating installation. In addition, the squirrel cage induction motor must be adequately maintained and must not exceed the allowable blocking time tD value during operation. 3, ventilation, inflatable structure Ventilation and inflatable structure of the electrical equipment is equipped with supply maintenance gas and maintenance installation to ensure explosion-proof function. Therefore, it is necessary to install appropriate maintenance and installation according to the explosion risk level of the application site and whether the equipment can often ignite. Under normal conditions, there must be no ventilation dead Angle inside the electrical equipment that affects the safety. During normal operation, the wind pressure or inflation pressure at the outlet shall not be less than 10 mm Hg, otherwise, the alarm shall be announced immediately or the power supply shall be cut off. The spark arc inside the device is not allowed to blow out from any gap or outlet. The use of ventilated aerated structure has nothing to do with the detonation level of explosive substances, and it is mostly used on equipment with easily damaged internal components or on larger electrical equipment, or on electrical equipment with spontaneous combustion point T4 and T5 as the object that is difficult to make other explosion-proof construction methods. 4, explosion-proof oil-filled structure oil-filled explosion-proof structure has nothing to do with the grade of explosion transmission, and is suitable for small operation switches. The temperature of the surface and oil of the explosion-proof oil-filled construction equipment shall not exceed the rules in Table 1-1 when the operation frequency and current intensity can reach severe overload. This rule does not only refer to the structure, but all explosion-proof structures have this requirement. The depth of the cold oil layer (the interval between the oil surface and the area where the spark or arc occurs) shall be twice the maintenance depth of the small experiment, but not less than 10 mm. The oil filled with oil-filled explosion-proof electrical equipment should have high chemical invariance. In order to check the height of the oil level, the equipment should be equipped with an oil level indicator or an oil level signal. The switch, controller and other equipment of the oil-immersed explosion-proof transformer structure, because of the deterioration or leakage of the oil, the equipment damage is difficult to maintain, and special attention should be paid. In addition, when the explosion-proof function is damaged because of tilt or oil level shaking, the equipment cannot be continuously used. 5, substantial safe structure Substantial safe explosion-proof structure, only for weak current circuit. Such as testing instruments, control installation and other small electrical equipment. No matter under normal conditions, or the occurrence of electrical spark or risk temperature under abnormal conditions, it will not cause explosive substances to detonate, so this structure is a high safety explosion-proof structure. The outer temperature of all components on the circuit or equipment must be less than the rule to avoid ignition caused by the thermal effect. The electrical circuit of the substantial safety type explosion-proof structure must be isolated from other circuits to prevent mixed electromagnetic or electrostatic induction, especially the wiring outside the structure. It is necessary to adopt a thorough approach to ensure the explosion-proof function of electrical equipment and wiring. 6, the so-called extraordinary explosion-proof structure of electrical equipment, refers to the explosion-proof structure in addition to the above typical structural types. Therefore, it is necessary to fully consider the additional application premise when the statutory inspection authority recognizes. Yawei Transformer is mainly engaged in the production and sales of mine explosion-proof mobile transformer, mine explosion-proof dry transformer, mine transformer, explosion-proof transformer, mine mobile transformer, mine explosion-proof mobile transformer, mine explosion-proof mobile transformer, mine explosion-proof mobile transformer, mine explosion-proof dry transformer.