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What Should I Do If Diesel Generator Set Has Water Damage

Dec. 01, 2018

How to deal with the dampness of diesel generator sets in rainy weather

Check the generator set for moisture. The insulation resistance of the generator set can be tested with a 500 volt meg hometer. If the resistance value is less than 1 mge-ohmthe generator set has been wet. Although some generators have a good insulation design, they are not foolproof. If the generator set is wet, it must be dried in time to avoid malfunction. Several drying methods are described below.

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1. Hot air method


Remove all cover plates of the generator set to facilitate the escape of humid air. Use a hair dryer to blow in from the air inlet of the generator set. Note that the heat source and the winding should be kept at least 300mm to avoid generator set overheating and cause insulation damage. Control the surface temperature of the winding. The surface of the winding shall not exceed 85 °C with a thermometer, and the inlet shall not exceed 90°C. continue to blow and record the insulation resistance value every half hour. When the value is greater than the specified value, the drying process is completed. Remove the hair dryer, cover all the covers and try again.


2. Cold operation

A generator set that has been left in a dusty of humid environment for a long time can be idled for about 10 minutes while the automatic voltage regular power wire is disconnected. This may be enough to dry the winding surface and raise the insulation resistance value to more than 1 meg-ohm to generate electricity. The genset can resume normal operation.


3. Short circuit current drying method

First, the safe operation of the mechanical and electrical equipment of the genset is carried out to ensure the safety of operation on the generator set. The output end of the generator set is short-circuited via the short-circuit piece, and the short-circuit piece used should be able to withstand the rated current of the generator set. Disconnect the AVR and switch to the external 0-24V DC power supply to adjust the DC power supply voltage so that the current per phase of the stator is 50-70% of the rated current. Stop every 30 minutes, disconnect the external excitation power supply, and check 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-commissioned. The generator set can be operated at rated speed, but the speed should be kept constant to avoid temperature instability.


4. Load drying method

If only the surface is damp, it can be dried by a load drying method. When the generator set can be operated with a 50% rated current load. Then increase the rated current by 65% 85%, and 100%. The load of each stage is 4-5 hours. During the drying process, the insulation resistance of each winding should be checked periodically. After the insulation resistance value meets the requirements, the drying can be stopped, and the generator set is normally tested.


Judgment and treatment of water inlet failure of diesel generator oil casing


There are many reasons for the failure of the diesel generator oil casing water inlet. This fault is a sudden failure. Below will explain the specific reasons for this fault. Let us take a look at which components have problems.


1. Remove the side cover of the body and observe the water leakage around each cylinder liner. If the inner wall of the cylinder liner drops downward, the cylinder liner has blisters, cracks inside the cylinder head, or cylinder head gaskets are damaged.


When the cylinder liner has a blister or a cylinder head has a crack that causes water leakage, there is usually another phenomenon in which water or air bubbles emerge from the water tank water inlet when the diesel engine is started. If the cooling water radiator has air bubbles or water overflow, and then sound of helium is not heard at the cylinder head when starting the diesel engine, it is generally concluded that the cylinder head has cracks or the cylinder liner has blisters.


2. When there is dripping on the outer wall of the cylinder liner, it can be considered that the copper gasket under the cylinder liner seal or the cylinder liner is placed unevenly or damaged.


3. If the organic oil appears at the water inlet of the cold water radiator and the oil casing enters the water, it is generally determined that the oil radiator is damaged. If the oil cooling method of the diesel generator set is air-cooled, it can be concluded that there is crack in the cylinder head, which causes the water passage in the cylinder head to communicate with the oil passage, so that the water passage in the cylinder head to communicate with the oil passage, so that the water in the oil pan is filled, and the oil in the cooling water radiator enters the oil.


How to do if there is water in the diesel generator room?


The diesel generator room may encounter water ingress, and Starlight tells you that you can do the following emergency treatment.


1. Close the corresponding water valve and pull off the live part of the power switch to put the device off. Use sandbags to block the flow of water to important equipment.


2. Turn on the basement sewage pump drain or drain with a submersible pump.

3. Immediately report the project supervisor, organize personnel to timely clear the water in the generator room


4. Drying and cleaning the equipment that is flooded in the generator set room can only be restored and put into use after the equipment is completely drained and meets the requirements.


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