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2022

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09

Several Precautions for Generators

Proper use and maintenance of the generator set can extend its service life:
Preparation before starting:
1. Machine room operators should comply with safety operating procedures, wear work clothes and insulated shoes, and the crew should have a clear division of labor;
2. Check if the protective railings of the flywheel and generator are intact;
3. Check all gearboxes, clutches, speed regulators, oil levels, and fasteners to ensure they are in good condition. Start only when the oil and water temperature is not lower than 20 degrees Celsius;
4. Set the pipeline gates of each system in the "working" position;
5. Check the connecting bolts of the transmission mechanism and tighten them properly;
6. Check whether the clutch handle pressure is normal and whether the overspeed safety device is positioned;
7. Check whether the pressure of the gas cylinder is normal and whether the overspeed safety device is positioned;
8. Open the discharge valve of the air pump;
9. Check whether the circulating water pump, oil pump and fuel pump are normal;
10. Place the excitation resistor at the maximum resistance position and disconnect the power supply switch.
Starting and running operations:
1. For units that have been shut down for more than 24 hours, the trial valve must be opened first and the oil pump must be started. For units that have been shut down for more than 7 days, the insulation resistance of the exciter and operating circuit should be measured and must meet the requirements;
2. Start the fuel pump, release the air from the pipeline, and observe if the voltage is within the specified range. If it is normal, it can only be officially started;
3. Check if the voltage of the starting power supply meets the requirements. If the voltage is normal, press the start button and wait for the diesel engine to run normally before releasing it;
4. After the diesel engine is running, observe the indicated value on the oil pressure gauge. When it rises above the specified value, stop the oil pump and close the scavenge pump drain valve. Thread in the front clutch screws;
5. After the generator is started, it is considered that the generator and all electrical equipment have been charged, and the human body must not touch the live parts;
6. After the generator is started, the speed of the diesel engine should be gradually increased and an inspection should be conducted before power transmission;
7. Gradually adjust the speed of the diesel engine, but pay attention to observe whether the generator operates normally during the adjustment. Under normal conditions, the brushes on the Slip ring and commutator shall be free of bounce, spark and abnormal sound;
8. Adjust the voltage and frequency output of the generator, and the voltage value should be stable and reach 380v+-10v, and the frequency should reach 50Hz+-0.5Hz.

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