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3.4.10.3 Calibrating the Reverse Power Protection
7UM62 Manual
C53000-G1176-C149-3
− Read out the motoring power with polarity (negative sign) in the operational
measured values and note it down as P
− Read out the reactive power with polarity (positive sign) in the operational
measured values and note it down as Q
3. If possible reduce excitation to approximately 0.3 times rated apparent power of
generator (underexcited).
Caution!
Underexcitation may cause the generator fall out of step!
− Read out the motoring power with polarity (negative sign) in the operational
measured values under and note it down as P
− Read out the reactive power with polarity (negative sign) in the operational
measured values and note it down as Q
4. Adjust generator to no-load excitation and shut down or select the desired
operational state.
P/P
underexcited
N
Q
2
P
1
P
2
Figure 3-37
Determination of the Correction Angle W0
The read-out measured values P
correction. Calculate according to the following formula:
The power values must be inserted with their correct polarity as read out!
Otherwise faulty result!
ϕ
This angle
is entered with reversed sign as the new correction angle under
corr
address 0204 CT ANGLE W0:
New setting CT ANGLE W0 = –
A quarter of the sum of the measured values P
reverse power protection P> REVERSE under address 3102.
If the generator is connected with the network, reverse power can be caused by
− closing of the regulating valves,
− closing of the trip valve
Because of possible leakages in the valves, the reverse power test should – if possible
– be performed for both cases.
3.4 Primary Commissioning Tests with the Generator
(see table below).
1
(see table below).
1
(see table below).
2
overexcited
Q
1
Q/Q
Item
N
1
P
0
2
3
, and P
are now used to carry out angle error
1
2
P
ϕ
atan
-------------------- -
=
corr
Q
ϕ
corr
(see table below).
2
Active power
Reactive power
P
0
P
1
P
2
P
–
1
2
Q
–
1
2
+ P
is set as pick-up value of the
1
2
Q
0
Q
1
Q
2
387
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