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Explosion-proof motor must be reliably grounded. The closed production workshop of a small flour mill in Jiangsu Province, Qingjiang Motor Factory, Jiangsu Province, is actually a reinforced concrete and brick-concrete structure. Considering the characteristics of the flour processing industry, it has been built in the infrastructure. After the metal structures such as steel windows are all connected to the network, they are well grounded. For more than ten years, the equipment is in a state of normal operation. The technical transformation is carried out from the first day of the force, and the new installation of the 4518225 River 2 explosion-proof phase in the building. Asynchronous motor, in use, constantly reflects the solution. The motor is not able to maintain uniform and stable load during the operation of the flour conveying fan. Therefore, the vibration of the fuselage is large. In order to adapt to this condition, the motor is installed under the foot. There is only a bowl-shaped rubber damping pad. On the pipe that enters and exits the fan, the sleeve made of canvas is used as the telescopic transition device. The concentration of flour dust in the environment is not a large number of days, the worker on duty is on the motor machine. When the dust on the seat was swept, it was found that it was in contact with the bottom of the hot frying pan.
However, the brush is prone to hair falling, and the dust is not clean. If the pressure is increased, the hands and feet are a little numb. When the motor casing is directly touched by hand, the motor is found to be leaking. Tested with an electric pen, the oxygen bubble is very bright; with 0 Ding 8908, dialing to 700, the amount of steel window frame near the ground is high, only the number jumped 1 is no longer obvious. Afterwards, they transported the motor to our factory, and asked for it. After checking the test bench, it was confirmed that the insulation voltage, no-load, short-circuit vibration and noise of the motor reached the factory level, and there was no leakage. After the motor returns to the user, it will soon reflect that the motor casing is still energized. It is required to go to the on-site service in the running motor room. The electric pen touches the base, the bubble is very bright, and the other hand touches the nearby steel window frame. The ground feels awkward, indicating that the voltage is indeed high. The pointer and the 5th-level expert commented on the test, and the purpose was to beat 400 in an instant and slow down 100.
For the 25-speed test, the pointer hits 2 and then drops to 50, and changes to 50-speed measurement. After the pointer hits 40, it drops to 10, and there is induced voltage on the display stand; then it is replaced with 500, file measurement, red pen. Pick up the base, the pointer is at 36, swinging left and right, red and black two positions, the pointer is reversed, and the machine has a positive charge on the base. The higher DC voltage should be the positive electric charge generated by the contact friction of the flour dust particles in the long-distance transportation of the iron pipe, which is transmitted to the machine base by the blower of the fan impeller, and the rubber pad and the canvas sleeve are insulated. The positive phenomenon of the positive charge on the base can not be leaked and gradually accumulates. The above phenomenon analysis shows that the motor may be in the position of the suspension clamp to check that the motor has a copper core ground wire with sufficient cross section, which is the welcome of the core cable. Check the cabinet directly to the grounding terminal. The discovery of the competition is a emptiness. Surprising. This is the root of various kinds of electrification phenomenon. It was later found out that during the technical transformation construction process, the original grounding wire was not long enough due to the change of the position of the motor junction box. If you add a connection at the motor, you will hate it, so you can loosen the grounding point in the cabinet and pull the ground wire to the motor, but forget to make up the connection, which will cause trouble later.
According to this, the installation and wiring of the helium gas equipment should be checked and reviewed by the special person. It is necessary not only to find out the electrical circuit, but also to find out each grounding point. All flammable dust in the flour processing plant is an explosive environment. Except for the fireworks, the metal casings of all electrical equipment used in the field must be properly grounded so that the inductive and static charges can be quickly and vented in time to eliminate hidden dangers and ensure safe operation. After the motor is connected to the ground wire, it will be called normal operation in a few months, and it will be safe.
Explosive-type electrical equipment should be used in the flammable dust environment. The reliable grounding of the explosion-proof electrical equipment is an example of the explosion-proof motor that is related to the personal and explosion-proof safety of the explosion-hazard environment. The explosion-proof motor makes the call, and it must be correctly called the ground. It should be checked and maintained frequently.
Explosion-proof motor must be reliably grounded. The flour mill mentioned that the flour mill selected Taiwan 1; 2212 flameproof motor 1 for flammable dust such as his powder case ± this is a lot of my previous juice list