The main reasons why the temperature of the diesel generator set is too high are:
1. The diesel engine uses hard water for a long time, and a large amount of scale forms in the water tank. and water channels, resulting in poor heat dissipation.
2. There are too many impurities deposited in the water channels between the body and the cylinder head, which blocks water circulation and results in poor heat dissipation.
3. Seriously burns engine oil, causing excessive carbon deposits and poor heat dissipation.
4. Improper operation and use. When starting the diesel engine, you must first use a small or medium throttle to preheat for a while. Do not suddenly increase the throttle or suddenly increase the load, otherwise the diesel engine will run abruptly and the temperature will rise sharply. Or, long-term overload operation of the diesel engine will also cause the diesel engine to become too hot.
5. Delaying fuel delivery too late will cause the diesel engine to overheat.
6. Put it into operation at full load immediately after repair, causing overheating or jamming of moving parts due to too little mounting clearance.
7. A lack of cooling water causes the diesel engine to overheat.
If the temperature of the diesel engine of the diesel generator set is too high, it will cause reduced matching clearance, resistance and poor lubrication of moving parts in severe cases. cause cylinder pulling and shaft holding accidents. Therefore, when the temperature of the diesel generator set is too high, it should be repaired in time.
What are common reasons why a generatorcar does not produce electricity?
The inlet air temperature is ambient temperature; the outlet air temperature should not exceed 40°C.
According to international technical requirements, the ambient operating temperature of the generator is set at 40°C. All designs and wattages are based on this ambient temperature. For generators, ambient temperature is the inlet air temperature of the generator. Since the generator works with the diesel engine, the heat generated by the diesel engine will cause the entire space to exceed 40°C.
The ambient temperature of the generator during actual operation must not exceed 40°C. If the actual ambient temperature exceeds 40°C, the generator must operate at reduced power. For the ambient temperature, if it is lower than 40°C, the generator power may be higher than the rated power.
Detailed information:
1. Check that the internal combustion engine and the transmission part of the generator should be reliably connected, the output line wires should be well insulated, and all instruments should be complete and efficient.
2. After starting, it should run at low speed for 3-5 minutes. The operation can only be started after the oil temperature and pressure are normal. There should be no abnormal noise when the generator accelerates, the slip ring and commutator brushes should be in good contact, and there should be no jumps or sparks.
3. Before shutdown, you must first turn off the main switches of each power branch, gradually reduce the load, turn off the main power switch of the generator and reset the exc rheostat.itation to the maximum resistance position to reduce the voltage to the lowest value. Turn off the excitation switch and neutral point grounding switch to stop the internal combustion engine.
Baidu Encyclopedia - Generator Reverse Power
Inlet air temperature is too high or inlet water temperature is too high is too high and the cooler is blocked. The inlet air or water temperature must be lowered to eliminate blockage in the cooler. Before the fault is cleared, the generator load must be limited to reduce the generator temperature.
If the bearing is filled with too much or too little grease, grease should be added according to regulations, generally 1/2 ~ 1/3 of the bearing chamber (the upper limit is used to low speeds, and the lower limit is used for high speeds). And it is advisable toe do not exceed 70% of the bearing chamber.
Bearing wear. If wear is not significant, the bearing may overheat locally; if wear is severe, the stator and rotor may rub against each other, causing the stator and rotor avoidance parts to overheat. Bearings should be checked for noise. If friction between the stator and rotor is detected, the machine should be stopped immediately for maintenance or replacement of the bearings.
Extended information:
When the external circuit feeds the excitation winding to Through the brush, a magnetic field is generated, causing the claw poles to be magnetized into N poles and S poles. As the rotor rotates, the magnetic flux changes alternately in the stator winding. According to the principle of electromagnetic induction, it can be seen that an alternating induced electromotive force isgenerated in the three-phase winding of the stator. This is how an alternator produces electricity.
The main motor (i.e. motor) drives the rotor of the synchronous generator excited by direct current to rotate at a speed n (rpm), and the stator winding three-phase induces an alternating potential. If the stator winding is connected to an electrical load, the motor will produce alternating current. The alternating current will be converted to direct current through the bridge rectifier inside the generator and output from the output terminal.
The alternator is divided into two parts: the stator winding and the rotor winding. The three-phase stator winding is distributed across the housing at an electrical angle difference of 120 degrees to each other. is composed of two polar claws. When the rotor winding is connected to direct current, it is energized and the two pole claws form the N pole and the S pole.
The magnetic field lines start from the N pole, enter the stator core through the air gap and then return to the adjacent S pole. Once the rotor turns, the rotor windings cut the magnetic lines of force, generating a sinusoidal electromotive force with a mutual difference of 120 electrical degrees in the stator windings, i.e. three-phase alternating current, then converted into direct current output via the rectifier element composed of diodes.
Baidu Encyclopedia - Car Generator