When diesel generator sets are used outdoors, it is inevitable to encounter rainy weather. If not handled properly, they are prone to moisture problems, especially when the motor of the generator set gets damp, which has a significant impact on the service life and operation of the generator set. Therefore, once the generator set gets damp, it should be dried immediately to avoid major accidents.
After the motor of the generator set gets damp, it must be dried in a timely manner. According to the capacity of the motor and the degree of dampness, the commonly used drying methods are as follows:
(1) Oven (furnace) baking method
Where conditions permit, place the motor as a whole (preferably by disassembling the stator and rotor)
Gradually increase the temperature in the oven (furnace) for baking. The oven (furnace) should be well-ventilated. In order to remove the moisture inside the motor, it is better to have a double-layered structure, with the motor placed in the inner layer and heated on the outer layer. The temperature of the inner layer should be maintained at 90 to 100°C, and there should be no open flames, smoke, dust or other flammable and corrosive gases present. Generally, continuous baking for 8 to 18 hours is required. During this period, the insulation resistance value of the motor can be measured several times until it reaches the specified value and stabilizes.
(2) Steady-state short-circuit current method
After the alternator gets damp, short-circuit the three phases in the outlet box, then increase the generator speed to the provisional speed and keep it constant. Adjust the excitation current first to make the stator short-circuit current reach 50% to 70% of the rated current and maintain it for 4 to 5 hours. Then increase the excitation current to make the short-circuit current reach 80% to 100% of the rated value. Keep the coil temperature below 85℃. Measure the insulation resistance and temperature of the coil every 30 minutes until the insulation resistance reaches the specified value and stabilizes.
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Post time: Dec-12-2025