Causes of Diesel Generator Set Trip
by Starlight Generator dieselgeneratortechTripping
phenomenon
A.If diesel genset
operates under rated conditions for a few minutes, the automatic air switch
trips, after recloses, then trips a few minutes later with a burning odor.
The
cause:
The main contact of the
automatic air switch is not well contacted or the spring pressure is
insufficient. and the lead-out wire of the switch is not well contacted. The
above two reasons will increase the contact resistance of the main circuit of
the automatic air switch and cause serious fever, which will lead to the action
of the thermal release and lead to wrong tripping.
Methods
of resolution:
At this time, we should
clean the main contacts of the automatic air switch and flatten them with a
fine file or fine sandpaper; Adjust contact spring pressure to make good
contact; clean contacts, apply conductive paste if necessary, and lock
connection screw.
B.Diesel generator trip immediately after connecting load.
After the unit starts, the generator terminal voltage is normal, but when the external circuit is connected, the load automatic air switch will trip immediately.
The
causes:
External circuit short
circuit and too heavy load.
Methods
of resolution:
Find out the short
circuit point of the external circuit and repair it. Reduce load to reduce load
current output of generators.
But when we do not know
what is causes of genset tip, what should do? After power generator set
tripping, first check genset to judge the cause of this trip, and then take
appropriate measures, the specific steps are as follows:
1.Check whether there is
a problem of wrong operation, and whether the secondary circuit will cause
tripping;
2.When the main circuit
breaker at the outlet of transformer set of generator trips automatically,
first check whether the generator indicator has any obvious fault symbols, if
have, should cut off the excitation immediately; if not abnormal symbol, under
the situation of good furnace condition, the electrical attendant should adjust
the generator voltage and frequency in the normal range, check whether the
high-voltage auxiliary power with the generator set trips, whether the start-up
transformer is put into linkage, and whether the auxiliary power is normal;
3.According to accident
phenomena, to judge the nature and scope of the fault, and clearly inspect the
external of transformer set of generator and related equipment, to identify
whether there are external fault characteristics;
4.Need to pay
attentions, If switch tripping occurs in incomplete phase, need to remove start
of switch protection failure; if it is not failure protection problem, it is
necessary to open all switches connected to the same bus in time;
5.If because of busbar
differential protection operation, or generator is over-current protection and
other over-step tripping due to faults in substations, check the generator's
external, it is normal, after fault isolation, the connection network is
adjusted and connected to the grid;
6.Before tripping, if
there is forced excitation and current shock. Reflecting the main protection
(differential, heavy mashgas, etc.) action of the internal faults of
generator-transformer unit, while the power grid is running normally, should
shut down at this time;
7.And that’s another one
that will quickly shut down a generator: alternator or prime mover
over-temperature, as heat causes lubrication to break down and bearings to
swell, increasing friction, causing more heat, and potential total failure or
more fire;
8.If there is no strong
excitation action and no impulse current before tripping, the operation of
power grid is also normal. The generator's hydro-oil system and main
transformer are also normal. The following treatment should be done: check the
generator and its circuit, check the protection of the action, if all is
normal, generator can be boosted at zero. When boosting, if everything is
normal, the generator can be connected to the grid, and then continue to find
out the reasons. When boosting, the strong excitation and automatic adjustment
device shall not be put into operation. The neutral point of the high-voltage
side of the generator-transformer unit shall be grounded. If abnormal phenomena
are found, the generator-transformer unit shall be stopped immediately for
inspection.
If it is found that the
tripping is not caused by the failure of diesel generator set, it may be caused
by the wrong operation of the relevant personnel. At this time, the
demagnetization switch is often still in the closing position. Operators should
first manually trip the demagnetization switch and immediately re-connect
generator set to the grid.
Starlight diesel
generator set covers Cummins, Perkins, Volvo, Yuchai, Shangchai, Ricardo, MTU,
Weichai etc. If you have purchase plan recently, please feel free to contact us
by email sales@dieselgeneratortech.com.
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Created on Jun 21st 2019 20:03. Viewed 211 times.