What are the reasons for the unstable frequency of diesel generator sets?
There are many reasons for the instability of the frequency of diesel generator sets. When we analyze the reasons, we must speculate in a scientific and reasonable way, and we must also analyze based on the actual situation and work experience.
According to the formula relationship between generator frequency and prime mover speed: f= pn/60, it can be seen that the operating frequency f of the diesel generator set is closely related to the rotor speed n and the magnetic pole logarithm p, so when the diesel generator frequency is unstable In this case, the rotor speed and the number of magnetic pole pairs should first be considered. When the number of magnetic pole pairs is fixed, the factor that affects the frequency is the speed.
Common cause analysis
(1) Oil circuit problem
Oil pipeline problems are mainly manifested in four aspects. The first is pipeline cracks, that is, the oil pipeline is damaged. If there are cracks, the oil transmission is not smooth and the tightness is reduced.
Secondly, the fuel tank level is too low, causing air and impurities to be mixed into the fuel. The oil does not meet the needs of the fuel tank, and other impurities are invisibly mixed in.
Thirdly, the filter in the oil circuit is clogged. The filter in the oil circuit has not been cleaned for a long time, and dust and impurities block the channel, causing the oil to not flow smoothly.
Fourth, there is oil leakage in the fuel pipeline, which will cause insufficient oil supply to the entire generator.
The above oil circuit problems are common problems that lead to unstable frequency of diesel generator sets. Failure of the oil circuit will directly lead to poor oil supply and a decrease in the speed of the generator, thus causing frequency instability.
(2) Fuel injection pump failure
The failure of the fuel injection pump is an important cause of frequency instability. When the fuel injection pump has problems such as inflexibility of the fuel supply gear rod and reduced elasticity of the speed regulating spring, it will cause uneven fuel supply to each cylinder of the diesel generator, resulting in changes in rotational speed. , thereby causing frequency changes.
(3) Fuel injector failure
The failure of the fuel injector is mainly due to natural wear. Due to the complicated position of the fuel injector, the possibility of manual injury is small. When the diesel generator set has been running for a long time, the impurities in the fuel may be attached to the needle valve assembly. , and then the flow of oil causes adverse reactions to the fuel injection. At this time, the amount of fuel injected by the injector changes, sometimes large and sometimes small, causing the rotational speed to change, which in turn causes frequency instability.
(4) Speed sensor measurement distortion
The sensor plays the role of control induction. The speed sensor in the diesel generator is a magnetoelectric sensor. This type of sensor itself is prone to electromagnetic reactions and is sensitive to electromagnetic phenomena. It is not prone to failure if it is properly maintained and repaired. However, if it is not used for long-term operation, Maintenance, dust in the air will gather in the gap of the sensor, causing sensor measurement failure and large error or distortion of the displayed data.
(5) Speed control system failure
The speed control system is a stability maintenance system, which directly affects the working status of the diesel generator. If the speed control system fails, it may affect the overall control of the speed control system, the oil speed will be affected, and the frequency of the generator set will also be affected. Stablize.
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