In this article, we
mainly discuss the cause of diesel generator undervoltage faults.
1.
Diesel engine mechanical speed regulation
The speed regulation of
diesel engine is divided into electronic speed regulation and mechanical speed
regulation. If it is mechanical speed regulation, then there is a fuel pump mechanism on the diesel engine that controls
the oil quantity and oil paths. There is a pull rod on the top to control the
oil quantity. It is called speed control pull rod. A speed limit (high speed)
push rod and a speed control push rod are distributed on both sides of the
speed control pull rod. When the power is turned on for 20 seconds, the low
voltage is reported. Don’t know whether the voltage and frequency is always not
to go up. If it is not going up, it may be the speed, you can adjust the speed
control push rod. However, if the diesel engine fails, there is usually a major
fault. The main fault is solved, and a series of minor faults are solved.
2. The voltage sampling
line is loose – The voltage cannot be measured
3.
Remanence
If the generator has no
residual magnetism, then the voltage system of the generator cannot be built at
the beginning. For this problem, we need to know how much volt the excitation
output of the generator AVR voltage regulator is, and then connect the
corresponding voltage source to the excitation output line for magnetization
(the voltage type should be corresponding and the polarity should not be
reversed).
4.
Ground fault
If three-phase grounding
occurs, the voltage and current are very low. At this time, it is mainly
necessary to check whether the grounding discharge device is closed or
grounded.
5.
Voltage regulating plate failure
Due to changes in
environmental factors, the parameters of the AVR pressure regulating plate are
no longer applicable and need to be re-adjusted. Generally speaking,
non-parallel diesel units basically do not have such problems, because the
parameters of the pressure regulating plate are fixed values ( 400V), which is
generally not adjustable. This problem may occur only for gensets that are used
in parallel because the AVR voltage regulator is regulated in accordance with
the main bus voltage, it is not static. At this time, the parallel device
usually has a voltage regulating signal sent to the AVR voltage regulating
plate. In this case, either check whether the voltage regulating signal is connected
incorrectly, or try to use the electronic control quickly when the power is
turned on (parallel device, voltage regulating plate, etc.) to reset the
voltage.
6.
The varistor or rectifier bridge diode on the generator winding is damaged
The function of the
varistor is: when the overvoltage fault occurs, the varistor is turned on to
reduce the voltage. If the varistor is broken down or turned on for other
reasons, it is conceivable that the voltage must be very low. The rectifier
bridge has six diode, the set DC power supply is used to supply the voltage
regulating plate and the excitation device. If the rectifier bridge diode is
damaged, the functions of the voltage regulating board and the excitation
device will be greatly reduced.
In order to avoid
generator failure, regular maintenance is very necessary. This can not only
give a full play to the excellent performance of the diesel generator set, but
also extend the service life of the genset. Due to different brands of diesel
generators, the maintenance items are different. In order to maintain your
diesel generator accurately, the units should be maintained strictly in
accordance with the user's maintenance manual provided by the supplier.
Jiangsu Starlight Power
is as a professional diesel generator set OEM with more than 40 years in the
field of generator manufacturing. We can provide multiple brands of emergency
diesel generators with good quality, such as Cummins, Perkins, Volvo, Deutz,
Yuchai, Weichai, Shangchai, etc. If you are interested, please contact us to
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