Measurement function application for a 110kV OHL
SEMOD54481-12 v9
Single line diagram for this application is given in figure 187:
110kV Busbar
110kV OHL
P Q
600/1 A
IEC09000039-1-EN V2 EN-US
Figure 187: Single line diagram for 110kV OHL application
In order to monitor, supervise and calibrate the active and reactive power as indicated in
figure 187 it is necessary to do the following:
1. Set correctly CT and VT data and phase angle reference channel
PhaseAngleRef
(see
section
"") using PCM600 for analog input channels
2. Connect, in PCM600, measurement function to three-phase CT and VT inputs
3. Set under General settings parameters for the Measurement function:
• general settings as shown in table 39.
• level supervision of active power as shown in table
40.
• calibration parameters as shown in table 41.
Table 39: General settings parameters for the Measurement function
Setting Short Description Selected
value
Comments
Operation Operation Off/On On Function must be
On
PowAmpFact Amplitude factor to scale
power calculations
1.000 It can be used during commissioning to
achieve higher measurement accuracy.
Typically no scaling is required
PowAngComp Angle compensation for phase
shift between measured I & U
0.0 It can be used during commissioning to
achieve higher measurement accuracy.
Typically no angle compensation is required.
As well here required direction of P & Q
measurement is towards protected object (as
per IED internal default direction)
Mode Selection of measured current
and voltage
L1, L2, L3 All three phase-to-earth VT inputs are
available
k Low pass filter coefficient for
power measurement, U and I
0.00 Typically no additional filtering is required
UGenZeroDb Zero point clamping in % of
Ubase
25 Set minimum voltage level to 25%. Voltage
below 25% will force S, P and Q to zero.
IGenZeroDb Zero point clamping in % of
Ibase
3 Set minimum current level to 3%. Current
below 3% will force S, P and Q to zero.
UBase (set in
Global base)
Base setting for voltage level
in kV
400.00 Set rated OHL phase-to-phase voltage
IBase (set in
Global base)
Base setting for current level
in A
800 Set rated primary CT current used for OHL
Section 16 1MRK 511 358-UEN A
Monitoring
380
Application manual
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