Transcript GEM/GET Cooling Program

Governor
Control
Your Goal
To understand Governor control system
design and maintenance practices for
Woodward UG8 Hydraulic system, and
2301 Electronic governors.
Governor Oil Specifications
•
•
•
•
Use oils which have a high viscosity
index.
If oil temperature in the governor 180F,
use S.A.E 40
If oil temperature above 180F, use S.A.E
50
Engine oil can be used if it meets these
requirements.
Compensation Adjustment
After the temperature of the engine and
the oil in the governor have reached
their normal operating values, you can
make compensation process without
loading the engine.
Compensation Adjustment
1.
2.
3.
Loosen the nut holding the
compensation adjusting
pointer and set the pointer
at maximum position.
Remove the plug and open
(unscrew) compensating
needle valve three or more
turns with a screwdriver.
Wait engine to hunt or
serge for half a minute
.
Compensation Adjustment
4. Loosen the nut holding the
compensation adjusting pointer
and set the pointer at the lowest
position.
5. Gradually close the needle valve
until hunting just stops. Don’t
go beyond this position.
6. Check the amount left to fully
close the needle valve. 1/8 – ¼
turn open makes a satisfactory
adjustment.
7. If hunting did not stop, raise the
compensation pointer two
divisions of the scale,
8. Open the needle valve again and
repeat the cycle.
WOODWARD UG8 OIL CHANGES
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Oil should be clean and free of foreign
particles.
Under favorable conditions, the oil may
be used for approximately six months
without changing.
What is synchronization?
The matching of the output voltage wave
form of one alternating current
generator with the voltage wave form of
another alternating current electrical
system.
Synchronization of Engine
Generator Systems
For two systems to be synchronized, five
conditions must be matched:
1. The number of phases in each system.
2. The direction of rotation of these phases.
3. The voltage amplitudes of the two systems.
4. The frequencies of the two systems.
5. The phase angle of the voltage of the two
systems.
Parallel Operation of Alternators
A
100%
speed
Load
100%
DROOP SYSTEM
63
60
speed
57
0
50%
Load
With droop the speed
decreases with load
100%
Parallel Operation of Alternators
C
B
100%
speed
4%
A
50%
Load
100%
Parallel Operation of Alternators
B
100%
speed
F3
F2
25%
F1
50%
Load
A
75%
100%
Droop / Isochronous
If multiple generator sets operate in
parallel in an isolated system, operate
only one generator in an isochronous
and all other generators in a droop
mode.
The Isochronus generator is a swing unit
2301 Electric Governor
Bus
ENGINE
Magnetic
Pickup
GEN
Actuator
3 ph
3 PH
PT
CT
2301 Load sharing &
speed control
DC Power 20 –
40 V DC
Parallel lines
2301 Load Sharing Control Box