When the Cummins diesel generator set is used outdoors, it will inevitably encounter bad weather, so improper handling can easily cause damp problems, especially when the motor of Cummins diesel generator set gets damp, which is very important to the life and work of Cummins diesel generator set. Impact. After the Cummins diesel generator set gets wet, it must be dried in time. The processing method is as follows.
Hot air method: Remove all covers of Cummins diesel generator set to facilitate the escape of humid air. Use a hair dryer to blow inward from the air inlet of the Cummins diesel generator set. Note that the distance between the heating source and the winding should be kept at least 300mm to avoid overheating and causing insulation damage. To control the surface temperature of the winding, use a thermometer to measure the surface of the winding and the temperature shall not exceed 85℃, and the air inlet shall not exceed 90℃. Keep blowing and record the insulation resistance value every half an hour. When the value is greater than the specified value, the drying process has been completed. Remove the hair dryer, cover all the covers, and then retry the trial operation.
Oven (furnace) baking method: where conditions permit, put the motor as a whole (better to disassemble the stator and rotor) in the oven (furnace) and gradually heat up and bake. The oven (furnace) should be able to ventilate. In order to take away the moisture in the motor, it is best to be sandwiched, the inner layer of the electric discharge machine, and the outer layer to heat. The temperature of the inner layer is maintained at 90-100°C, and there must be no open flames, smoke, dust, and other flammable and corrosive gases. Generally, it is required to bake continuously for 8 to 18 hours, and the insulation resistance value of the motor can be measured several times until it reaches the specified value and is stable.
Cold operation method: Cummins diesel generator sets that have been left in a dusty and humid environment for a long time can run idling for about 10 minutes with the AVR power wire disconnected. This may be enough to dry the winding surface and increase the insulation resistance value to More than 1 megohm, so that the Cummins diesel generator set can resume normal operation.
Short-circuit current drying method: First, carry out the safe operation of the machinery and electrical appliances of the unit to ensure the safety of operation on the Cummins diesel generator set. Short-circuit the output end of the Cummins diesel generator set via a short-circuit strip, and the short-circuit strip used should be able to withstand the rated current of the Cummins diesel generator set. Switch off the AVR and switch to an external 0-24V DC power supply. Adjust the DC power supply voltage so that each phase current of the stator is 50-70% of the rated current. Stop it every 30 minutes, disconnect the external excitation power supply, and detect and record the insulation resistance value. If the insulation resistance value is greater than the specified value, the external DC power supply can be removed, and the AVR can be reconnected and re-tested. Cummins diesel generator sets can not run at rated speed, but the speed should be kept constant to avoid temperature instability.
Load drying method: If only the surface is damp, you can use the load drying method to dry. When dry, Cummins diesel generator set can run with 50% rated current load first. Then increase to the rated current according to the value of 65%, 85%, and 100%, and run each load for 4 to 5 hours. During the drying process, the insulation resistance of each winding should be checked regularly. After the insulation resistance value meets the regulations, the drying can be stopped, and the Cummins diesel generator set will run normally.
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