In fact, diesel generators have many uses. Therefore, it is very important to protect, inspect and maintain the diesel generator at regular intervals. Proper maintenance is the key to maintain the normal operation of the diesel generator.
In order to maintain diesel generators correctly, it is necessary to know the common faults that may damage them in order to know when overhaul of the generators is required.
Overheated
Overheating is one of the most common diagnoses for generator maintenance. Overheating in generators can be caused by a variety of causes, including generator overload, overspeed, winding insulation breakdown and insufficient lubrication of the bearing fuel.
When the generator starts to overheat, the alternator will also overheat, which greatly reduces the insulation performance of the windings. If ignored, overheating will further damage other parts of the generator, which may require repair or replacement.
Fault current
Fault current is any unintentionally high current in an electrical system. These faults can cause a variety of problems for your generator. They are usually caused by short circuits with low impedance.
If the fault is a short circuit in the generator winding, the generator must be inspected or repaired immediately because the winding may become hot and damaged.
Motor drive
Electric operation of the generator occurs when the engine cannot provide sufficient power for the generator to meet its load requirements. Here, the generator system is forced to compensate for losses by providing active power to the engine, essentially making the generator work like an electric motor.
The motor drive will not immediately damage the generator. However, ignoring it can cause the engine to overheat. Therefore, it is necessary to protect the engine, which can be provided by a limit switch or an exhaust hood temperature detector.
Remaining magnetic loss
Residual magnetism is the amount of magnetization left by removing the external magnetic field from the circuit. It usually occurs in generators and engines. Losing this residual magnet in the generator can cause problems for the system.
When the generator is not used for a long time due to aging or misconnection of excitation winding, residual magnetic loss will occur. When this residual magnetism disappears, the generator will not generate any power at startup.
Undervoltage
If the voltage cannot rise after the generator is started, the machine may face some serious problems. Undervoltage of the generator may occur at random for a variety of reasons, including fusing of the voltage-sensing fuse and damage to the excitation circuit.
Another possible cause of undervoltage in the generator is lack of use. Its alternator charges the capacitor with the remnants of the winding. If the generator is not used for a long time, the capacitor will not charge and the inadequate capacity will cause the voltage reading of the generator to be too low.
Protection and maintenance of the generator is necessary. If not repaired immediately, problems such as overheating, fault current, motor drive, residual magnetic loss and undervoltage may cause irreversible damage to the generator. Diesel generators are an important pillar of any failure to access a normal power grid, whether to keep lifesaving hospital machines working during power outages or to work outdoors such as construction and agriculture. Therefore, generator circuit breaking can have serious consequences. Therefore, the most common causes of generator faults should be understood so that they can be identified and repaired before they cause severe damage to the generator.
Post time: Apr-09-2020
