ABB RELION 670 Series Applications Manual page 197

1MRK 505 337-UUS A
Operate
Line
Margin
Operating point
without
turbine torque
IEC06000315 V2 EN-US
Figure 95: Reverse power protection with underpower IED and overpower IED
7.9.3 Setting guidelines
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
and ( SBase ).
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 34.
Table 34: Complex power calculation
Set value
A,B,C
Arone
PosSeq
A,B
B,C
C,A
Table continues on next page
Application manual
Underpower IED
Q
Operate
Line
Margin
P
Operating point
without
turbine torque
Mode
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
* *
× + ×
I V I
B B C C
*
×
V I
BC C
*
*
)
I
B
*
)
I
C
*
)
I
A
Section 7
Current protection
SEMOD172150-4 v7
(Equation 58)
(Equation 59)
(Equation 60)
(Equation 61)
(Equation 62)
(Equation 63)
191