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Treatment Of Moisture In The Motor Of An Out Of Tank Vertical
TIME：2024-06-04 Author：admin Views：
In the production site, due to the selection of the out-of-tank vertical pump motor and its maintenance, improper maintenance, environment and other factors, moisture into the motor to form condensation or direct water, resulting in reduced insulation resistance of the motor, affecting the normal use of the out-of-tank vertical pump motor and operational safety. This article mainly analyzes and introduces the drying treatment methods for wet motors under different conditions, focusing on the principles and field applications of existing current drying and iron loss drying methods.
● Removing water from out-of-tank vertical pump motor
Drying method: small asynchronous motors are easy to disassemble. It can be dried on site according to the site environment, or disassembled to the maintenance machine room. General motor drying can be used in the following two ways.
The general out-of-tank vertical pump motor is suitable or external heating and drying motor, which is simple to operate. The principle is to utilize the radiation, convection and conduction of the external heat source to dry the motor during the drying process. Generally there are two methods:
1. Drying with light bulb (or infrared light bulb), oven, hot air blower.
2.When drying with light bulbs or tungsten iodide lamps, do not get too close to the coils to prevent them from burning out. Safety protection lamps must be used. When using an oven, the temperature should not exceed 100℃.
● Preventive measures
1. For chemical centrifugal pump motor with rotor extraction, it should be heated and dried in clean air. Clean all parts of the motor before drying.
2. When the motor is drying, the motor winding temperature must be lower than the required temperature of its specified insulation level (for safety reasons, it should be lower than its specified temperature of 10°C or less). In general, motor drying will be winding temperature control between 70 ~ 80°C.
3. The DC current cannot dry the motor whose winding is too wet to produce an electrolytic effect.
4. When using current and iron loss drying, the motor shell must have a good ground wire to prevent electric shock. When using light bulbs or tungsten iodide lamps for drying, it should also be taken to prevent electric shock.
5. When the closed motor does not pull out the rotor to dry, the motor's junction box or inspection holes should be opened to a certain gap. Small low-voltage motors can also open a gap in the motor end cap to facilitate the discharge of moisture inside the motor.
6. During the drying process, regularly measure and record the temperature and insulation resistance of each part of the winding. Record every 15-30 minutes at the beginning of drying, and check the temperature of the motor every 1-2 hours to prevent the motor from being damaged by overheating at a certain point.
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