There is still a large number of diesel generator sets used as backup power sources in enterprises. Diesel generator sets can perform normal equipment operation in the event of a power outage. During the use of generator sets, there may be some small faults or alarms, and some faults of the diesel engine should also be dealt with properly, especially when the voltage of the generator set is too high or too low. Reasonable countermeasures need to be found to deal with them, For the issue of high or low voltage of diesel generators, let's organize and take a look together:

Reasons and treatment methods for high voltage of diesel generator sets:
1. Reason: The generator set speed is too high. Treatment method: Reduce the opening of the turbine guide vanes of the generator set and reduce the speed of the generator set.
2. Reason: The air gap in the iron core of the shunt reactor is too large. Treatment method: Change the thickness of the iron core gasket of the reactor and adjust the air gap of the generator set.
3. Reason: The magnetic field rheostat is short circuited and the voltage regulation is malfunctioning. Solution: Identify the short circuit problem points and eliminate them.
4. Reason: Generator accident speeding. Handling method: Emergency shutdown for accident handling to avoid damage to the generator set.

Reasons and solutions for low voltage of diesel generator sets:
1. The original engine speed is too low. Solution: Adjust the original engine speed to the rated value.
2. The excitation circuit resistance of the diesel generator set is too high. Solution: Reduce the resistance of the magnetic field rheostat to increase the excitation current. For semiconductor excitation generators, it is necessary to check whether the additional winding joints are disconnected or wrongly connected.
3. The exciter brush is not in the neutral position, treatment method: or the spring pressure is too small. Adjust the brush to the correct position, replace the brush, and adjust the spring pressure.
4. Some rectifier diodes have been broken down. Solution: Check and replace the diode that has been broken down.
5. There is a short circuit or ground fault in the stator winding or excitation winding. Solution: Check the fault and clear it.
6. The contact surface of the brush is too small, the pressure is insufficient, and the contact is poor. Treatment method: If the surface of the commutator is not smooth, it can be polished with sandcloth at low speed, or the spring pressure can be adjusted.

The high or low voltage of diesel generator sets can lead to problems in the generator set, affecting its work efficiency. Therefore, before using the generator set, it is necessary to inspect it well, save energy consumption, and implement the advocated policies.