The motor of moisture-proof and baking

Due to the pumping station built in low-lying areas liable to waterlogging, more commonly in poorly

ventilated, drizzly conditions can easily be affected with damp be affected with damp, even suffering

from flood. Once the motor be affected with damp be affected with damp, when the voltage to be

affected with damp be affected with damp in the motor coil, it is easy to cause the breakdown of coil

winding and burning motor. So, even if used to dry the good motor, after stopping for a long time,

before start closing ventilation with full voltage current, must strictly check the windings of be

affected with damp be affected with damp. Examination method is the most commonly used high

resistance meter (that is, the shaking table) measuring insulation resistance and absorption ratio

(i.e. the insulation resistance R in 60 seconds to 15 seconds when the ratio of the R60 / R15). Motor

winding high efficiency three phase electric motor sinsulation resistance involves many factors, can be used commonly in practice the following standards: motor stator winding insulation resistance work every 1 kv voltage not less than 1 megohm; Rotor winding insulation resistance value not less than motor part 0.5 ohms. Usually below 500 v motor stator winding insulation resistance value not less than 0.5 ohms. 

More than 1000 v motor must absorb the measure, its value according to the rules should be followed: R60 / R15 1.3 or higher If cannot meet this requirement, he must to dry the motor. Commonly used methods for motor drying process with external drying, current drying and combined drying method of both. (a) outside to dry Namely the use of external heat source for dry processing, commonly used measures are: 1. Waft hot: using equipped with electric heaters of blower waft hot air drying process in order to achieve the purpose of; Baking: 2. The bulb in the sealed box, the use of a number of around 200 w bulb for baking, as well as around the motor for baking, can also be unwrapped motor, put the light bulb in the stator hole for baking. Baking heat infrared light bulbs or infrared thermal pipe may be adopted. It should be pointed out that baking temperature overheats, especially hole baking, motor stator winding of the damage caused by high temperature easy. Conditional situations can be baked with temperature control technology. Baking temperature control in less than 125 ℃ advisable. (2) current dry Also known as internal drying or short circuit drying. According to the size of the impedance of the motor and the

power supply to the motor three-phase winding in series or in parallel, then access a variable

resistor, adjust current to about 60% of the rated current value, electricity to dry. Note: by water

soak dry method cannot adopt the motor current, external drying should be adopted, or scope of the

external drying method is adopted to safety first, www.facebook.com/dongfeng.motor then

combined with the current drying method is adopted.