ABB Relion 670 Series Applications Manual page 164

Section 8
Current protection
Operate
Line
Margin
Operating point
without
turbine torque
IEC06000315 V2 EN-US
Figure 72: Reverse power protection with underpower IED and overpower IED
8.7.3 Setting guidelines
GlobalBaseSel : Selects the global base value group used by the function to define IBase , VBase and
SBase . Note that this function will only use IBase value.
Operation : With the parameter Operation the function can be set Enabled / Disabled .
Mode : The voltage and current used for the power measurement. The setting possibilities are
shown in table 19.
Table 19:
Set value
A,B,C
Arone
PosSeq
A,B
B,C
C,A
Table continues on next page
158
Underpower IED
Q
Operate
Line
Margin
P
Operating point
without
turbine torque
Complex power calculation
Mode
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Overpower IED
Q
P
IEC06000315-2-en.vsd
Formula used for complex power calculation
*
= × +
S V I V
A A
EQUATION2038 V1 EN-US
*
-
= ×
S V I
AB A
EQUATION2039 V1 EN-US
= × ×
S 3 V I
PosSeq PosSeq
EQUATION2040 V1 EN-US
*
-
= ×
S V (I
AB A
EQUATION2041 V1 EN-US
*
-
= ×
S V (I
BC B
EQUATION2042 V1 EN-US
*
-
= ×
S V (I
CA C
EQUATION2043 V1 EN-US
1MRK 511 407-UUS Rev. J
* *
× + ×
I V I
B B C C
*
×
V I
BC C
*
*
)
I
B
*
)
I
C
*
)
I
A
Phasor measurement unit RES670
SEMOD172150-4 v7
(Equation 72)
(Equation 73)
(Equation 74)
(Equation 75)
(Equation 76)
(Equation 77)
Application manual