How to check if the gasoline generator is not generating electricity?
1. First check whether the engine oil and gasoline are newly added. If not, they have been added for more than three months and the engine oil and gasoline need to be replaced. Because engine oil and gasoline are only valid for three months, oil and gasoline that have been used for more than three months have lost their viscosity and have no effect.
2. Check whether the oil and gasoline of the gasoline generator are filled up. If not, the generator will not be able to ignite and start.
3. If the machine has not been used for a long time, the oil level of the carburetor will drop, corrosion will occur inside, and the oil hole will be blocked. You only need to clean the carburetor.
4. If the above conditions are met, check to see if the spark plug is igniting. If not, remove the spark plug and put some gasoline on it before reinstalling it to see if the generator is igniting. If it doesn't spark, replace the spark plug with a new one.
5. Check whether the voltage regulator is broken. If it is broken, replace it with a new one.
6. Check the circuit to see if part of the circuit has fallen off or has poor contact. If so, deal with it immediately.
7. If there are no problems after the above inspections, the motor is burned out and needs to be replaced with a new one.
What is the reason why the Yamaha EF3800 gasoline generator cannot operate?
Theoretically, it should be possible. This kind of car is somewhat similar to the current hybrid car, which uses fuel Combustion generates power and at the same time charges the battery, or it can also be used as a storage battery. However, this system is more complicated. After multiple energy conversions, there will be energy loss, and it is not as efficient as directly using a charging pile. For reference.
What is the reason why the single-phase gasoline generator cannot produce 220V voltage?
How big is the engine? Is it electric start or manual start?
First check whether the gasoline is smooth. , and whether the spark is normal
Method: Remove the spark plug directly, block the spark plug hole with your finger, pull the pull plate several times with one hand, and smell the smell of gasoline with your finger after pulling it out
If yes, If it proves that the oil circuit is normal, check the oil circuit (oil switch, carburetor, etc.). Connect the spark plug to the high-pressure cap, touch its thread to the bolt or technical part of the body, pull the pull plate, and check whether there is spark jumping at the spark plug. If there is, then Normal, if not, check the flameout switch, high voltage package, spark plug and other circuits. Also, when plugging the spark plug hole with your fingers, can you feel popping impact and suction? If yes, it is normal. If not, check the valve clearance, whether the valve is stuck, etc.
After these three checks are completed or eliminated, it should be able to start normally
In addition, if it has an oil alarm, you should check whether the oil is sufficient. After adding an appropriate amount of oil, you can directly unplug the bottom of the body. If a line is connected, the engine oil series fault can be eliminated
The reason why the generator cannot send out 220V voltage after starting:
1. The excitation circuit is disconnected, causing the voltage to Can't rise. Check whether the excitation circuit isThe wire is broken and the contact is good.
2. The residual magnetism disappears. If the exciter voltmeter does not indicate that the residual magnetism has disappeared, the exciter should be magnetized.
3. The polarity of the magnetic field coil of the exciter is reversed, and its positive and negative connecting wires should be swapped.
4. When doing some tests during generator maintenance, the magnetic field coil was mistakenly supplied with reverse direct current, causing the residual magnetism to disappear or reverse direction. Magnetization should be performed again.
Extended information:
Other common generator faults and causes:
1. Generator overheating
1. The generator does not operate according to the specified technical conditions. If the stator voltage is too high, the iron loss increases; the load current is too large, and the stator winding copper loss increases; If the frequency is too low, the cooling fan speed will slow down, affecting the heat dissipation of the generator; if the power factor is too low, the rotor excitation current will increase, causing the rotor to heat up. Check whether the indication of the monitoring instrument is normal. If it is abnormal, necessary adjustments and treatments must be made to make the generator operate according to the specified technical conditions.
2. The three-phase load current of the generator is unbalanced, and the overloaded one-phase winding will overheat; if the difference between the three-phase current exceeds 10% of the rated current, it is a serious phase current imbalance, and the three-phase current is seriously unbalanced. Unbalanced phase currents will produce a negative sequence magnetic field, thereby increasing losses and causing heating of components such as pole windings and ferrules. The three-phase load should be adjusted to keep the current of each phase as balanced as possible.
3. The air duct is blocked by dust and the ventilation is poor, making it difficult for the generator to dissipate heat. The dust and grease in the air duct should be removed to make the air duct unobstructed.
4. The inlet air temperature is too high or the inlet water temperature is too high, and the cooler is blocked. The inlet air or water temperature should be lowered to clear the blockage in the cooler. Before the fault is eliminated, the generator load should be limited to reduce the generator temperature.
5. If the bearing is filled with too much or too little grease, grease should be added according to regulations, usually 1/2~1/3 of the bearing chamber (the upper limit is used for low speeds, and the lower limit is used for high speeds) ), and should not exceed 70% of the bearing chamber.
6. Bearing wear. If the wear is not serious, the bearing will overheat locally; if the wear is serious, the stator and rotor may rub together, causing the stator and rotor to overheat. The bearings should be checked for noise. If friction between the stator and rotor is found, the machine should be stopped immediately for maintenance or bearing replacement.
7. The insulation of the stator core is damaged, causing short circuit between the sheets, causing the local eddy current loss in the core to increase and generate heat. In severe cases, the stator winding will be damaged. The machine should be shut down immediately for maintenance.
8. The parallel wire of the stator winding is broken, causing the current of other wires to increase and generate heat. The machine should be shut down immediately for maintenance.
2. There is an abnormal voltage between the neutral line of the generator and the ground
1. Under normal circumstances, the air gap under each magnetic pole is caused by the influence of high-order harmonics or manufacturing processes. Very low voltage due to uneven magnetic potential. If the voltage is one to several volts, there will be no danger., no need to deal with it.
2. There is a short circuit in the generator winding or poor insulation to the ground, which causes the performance of the electrical equipment and generator to deteriorate and easily generate heat. It should be repaired in time to avoid the expansion of the accident.
3. There is no voltage between the neutral line and the ground when there is no load, but voltage appears when there is a load. This is caused by the imbalance of the three phases. The three-phase load should be adjusted to make it basically balanced.
3. The generator current is too large
1. The load is too large and the load should be reduced.
2. If a phase short circuit or ground fault occurs in the transmission line, the line should be inspected and repaired. After the fault is eliminated, it can return to normal.
4. The generator terminal voltage is too high
1. The voltage of the generator parallel to the power grid is too high. The voltage of the parallel generator should be reduced.
2. The fault of the excitation device causes over-excitation, and the excitation device should be repaired in time.
5. Insufficient power
Due to insufficient compound excitation compensation of the voltage source of the excitation device, it cannot provide the excitation current required for the armature reaction, causing the generator terminal voltage to be lower than the grid voltage. If the rated reactive power does not exceed the rated reactive power, the following measures should be taken:
1. Connect a three-phase voltage regulator between the generator and the excitation reactor to increase the terminal voltage of the generator so that the excitation device The magnetic potential gradually increases.
2. Change the phase of the excitation device voltage magnetomotive force and the generator terminal voltage to increase the resultant total magnetomotive force. A resistor of several thousand ohms and 10W can be connected in parallel at both ends of each phase winding of the reactor. .
3. Reduce the resistance of the rheostat to increase the excitation current of the generator.
6. The generator loses residual magnetism and cannot generate electricity when starting
1. The generator often loses residual magnetism after shutdown. This is because the material used for the exciter poles is close to mild steel and the residual magnetism is relatively small. few. When the excitation winding has no current after shutdown, the magnetic field will disappear. A battery should be prepared and magnetized before generating electricity.
2. If the magnetic poles of the generator lose their magnetism, a DC current larger than the rated current (for a short time) should be passed into the winding for magnetization, that is, sufficient residual magnetism can be restored.
Baidu Encyclopedia - Generator Failure
Baidu Encyclopedia - Generator