Installation Inspection Steps of AC Generator
by Starlight Generator dieselgeneratortechThe
AC generator installation inspection steps are as follows:
1) When installing the
generator, ensure that the cooling air inlet is unobstructed, and avoid
exhausted hot air from entering the generator. If there are blinds on the
ventilation cover, the window should face down to meet the requirements of the
protection level. For mechanical coupling of single-bearing generator, special
attention should be paid to the uniform air gap between the stator and rotor.
2) The coupling of AC
generator and diesel generator requires the parallelism and concentricity of
the coupling to be less than 0.05 mm. The requirements in actual use can be
slightly lower, within about 0.1 mm, too much will affect the normal operation of
the bearing, resulting in damage, the coupling should be fixed with a
positioning pin. Retest the coupling before installation.
3) The U, V, W, N marks
are printed on the terminal head in the generator outlet box, which does not
indicate the actual phase sequence and depends on the direction of rotation.
The UVW printed on the certificate indicates the actual phase sequence of
clockwise rotation, and VUW indicates the actual phase sequence of
counterclockwise rotation.
4) When the generator
with sliding bearing is coupled, the height of the center of the generator
should be adjusted slightly lower than the center of the diesel engine, so that
the weight of the flywheel on the diesel engine will not be transferred to the
generator bearing, otherwise the generator bearing will bear the additional
weight of the flywheel, which is not conducive to the formation of the oil film
of the sliding bearing, resulting in heating and even burning of the bearing.
5) If the neutral points
of each generator in the power supply system are connected to each other, or
when the generator neutral point is connected to the transformer and its load
neutral point, the genset will have a neutral current of 3 times the frequency
on the neutral line in operation. Therefore, the neutral-line current of the
generator must be measured under various load conditions that may occur during
operation. In order to prevent the generator from overheating, the line current
shall not exceed 50% of the rated current of the generator. The neutral-line
power is too large, and a neutral line reactor should be installed on the
neutral line to limit it.
6) According to the
schematic diagram or wiring diagram, select the appropriate power cable and use
copper connectors for wiring, copper joint and busbar. After the busbar and the
busbar are firmly fixed, the local gap at the joint is not greater than 0.05
mm, and the distance between the wires is not greater than 10mm, also need to
install the necessary grounding wire.
Generator
Maintenance
No-load test once a
week, running time is 10-15 minutes, so that problems can be found in time, and
ensure that the battery has enough capacity for the generator to start.
1. Before maintenance,
the automatic air switch of the generator should be cut off. The main switch
should be placed in the stop position, and the positive and negative power
cables of the battery should be folded to confirm that the generator cannot
start.
2. Check the battery
electrolyte water level. When it is insufficient, add sulfuric acid solution or
distilled water according to its concentration.
3. Calculate the
cumulative running time of the generator from the last maintenance. The air
filter should be cleaned every 50 hours, and the oil filter, diesel filter, and
water filter should be replaced every 250 hours.
4. Check the unit for
water and oil leakage and clean the generator body.
5. Connect the battery
power cord and connector. The test fault indicator should be on.
6. Check if the ground
wire is good.
7. Check the running
condition of the exhaust fan in the machine room, whether the diesel oil is
enough to run for 8 hours.
8. Check whether the
cooling water level and engine oil level are normal.
9. After the manual test
machine runs normally, turn on the automatic air switch of the generator,
switch the main switch to the automatic start position, perform a simulated
power failure test, and observe the automatic start of the generator.
10. Run the generator
with load for one hour, and observe whether the indicators of each instrument
and unit operation are normal.
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Created on Jan 9th 2020 00:55. Viewed 217 times.