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Explain the causes of diesel generator problems and related points

Source: Tianjin Generator Leasing Company | Release time: 2019-04-11

With the development of science and technology, people have higher and higher requirements for the quality and performance of scientific and technological products. A diesel generator is a generator with excellent performance and good quality. Not only can it provide electricity to life well, it can also provide equipment with power resources in some special equipment. The following is an introduction to "the reasons for the problems of diesel generators and the relevant points".



[Cause of Diesel Generator Failure]


Do you encounter the following situations in the application of diesel generators, that is, an undervoltage fault alarm and shutdown? What factors are related to this? Starlight has concluded that there are three main reasons in its long-term rich practical experience. Let's analyze it for everyone.


1.Failure of generator voltage regulating plate


It is possible that due to changes in environmental factors, the parameters of the R pressure regulating plate are no longer applicable and need to be readjusted. Generally, such problems do not occur in diesel units that are not parallel, because the parameters of the pressure regulating plate are fixed values ( 400V). In general, we ca n’t adjust it. Only the unit used for parallel operation may have this problem, because the R voltage regulator is adjusted according to the main bus voltage when it is paralleled. It is not static.


At this time, the parallel device usually has a voltage regulating signal sent to the R pressure regulating plate. In this case, you should check whether the voltage regulating signal is connected correctly, or try to use the electronic controls (parallel device, voltage regulating plate) quickly when you turn on the device. Etc.) Reset the voltage.



2. Speed regulation of diesel generator


Diesel engine speed is divided into electronic governor and mechanical speed controller. If it is mechanical speed regulation, then there is an oil pump mechanism on the diesel engine that controls the amount of oil and the oil circuit. It seems to be a common rail oil pump. There is a tie rod that controls the amount of oil. For the time being, it is called a speed regulating tie rod. A speed limiting (high-speed) jack and a speed regulating rod are distributed on both sides of the speed regulating rod. It's not always going up.


If it ca n’t go up all the time, it may be caused by the speed not going up. You can try to adjust the speed governor. Whenever the diesel unit fails, there is usually a major failure. The major failure is resolved, and a series of minor problems caused by it. The fault is resolved.


3.Ground fault


If the three-phase grounding of the outgoing line, the voltage and current are very low. At this time, you should mainly check whether the ground discharge device (such as the ground knife) is closed or grounded.


The function of the varistor is: the varistor is turned on to reduce the voltage when an overvoltage fault occurs. If the varistor is broken down or turned on for other reasons, it can be imagined that the voltage must be very low. Diodes and the set DC power supply are used to supply voltage regulating plate and excitation equipment. If the rectifier bridge diode is damaged, the function of voltage regulating plate and excitation equipment will be greatly reduced.


[Environmental requirements for diesel generators]


Everyone knows that diesel generator sets have certain requirements on the operating environment during operation, including temperature, altitude, and humidity. Among them, when the generator set is wet, we can restore normal use by drying it. There are also specially designed diesel generator sets for use at different altitudes. When the temperature is too high, we can also use external cooling and the cooling system of the generator set. There is another detail in the temperature that deserves your attention, and that is the thermal offset of the voltage.



When the ambient temperature and the temperature of the generator set increase, the magnetic permeability of the generator core decreases, the DC resistance of the winding increases, and the circuit component parameters will change, which will cause the output voltage of the generator set to change. This phenomenon is called voltage Thermal offset. Generally, the voltage thermal deviation of the unit is expressed by the percentage of the unit voltage change caused by the temperature rise, which is generally not allowed to exceed 2%.


What effect does voltage thermal offset have on diesel generators?


In the daily production and operation of the generator set, the staff needs to pay attention to the change of voltage at all times to prevent the occurrence of voltage thermal deviation. What effect will the voltage thermal offset have on the diesel generator set?


The voltage offset is for the extra voltage Ue of the network. It is the actual voltage of each point of the system under the abnormal operating mode of the power distribution system (that is, all components in the system are operating according to the reserved conditions). Bias u. The nominal voltage percentage performance of commonly used systems, namely: u = (U-Un) / Un *, the voltage offset is too large (whether it is high or low), which will not only affect the quality and output of industrial and agricultural products, Damage to the equipment, and the operation of the equipment of the power system itself is also very unfavorable.


Common impacts include: reduced output from generators, shortened or burned out motor life, affected steel furnace plant furnace output, electrical equipment insulation breakdown, shortened electrical equipment life, and large-scale power outages caused by voltage collapse.


The above introduction to "the reasons for the failure of diesel generators" and "environmental requirements for diesel generators" hope to help you understand "the reasons for the problems of diesel generators and the relevant points".


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