ABB Relion 670 Series Applications Manual page 200

Section 8
Current protection
Underpower protection
Operate
Line
Margin
Operating point
without
turbine torque
IEC09000019 V2 EN-US
Figure 90: Reverse power protection with underpower or overpower protection
8.12.3 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 27.
Table 27:
Set value
A, B, C
Arone
PosSeq
AB
BC
CA
Table continues on next page
194
Overpower protection
Q
Operate
Line
Margin
P
Operating point
without
turbine torque
Complex power calculation
Mode
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Q
P
IEC09000019-2-en.vsd
Formula used for complex power calculation
*
= × +
S V I V
A A B
EQUATION2055-ANSI V1 EN-US
*
= × -
S V I V
AB A
EQUATION2056-ANSI V1 EN-US
= × ×
S 3 V I
PosSeq PosSeq
EQUATION2057-ANSI V1 EN-US
*
= × -
S V ( I I
AB A
EQUATION2058-ANSI V1 EN-US
*
= × -
S V ( I
BC B
EQUATION2059-ANSI V1 EN-US
*
= × -
S V ( I I
CA C
EQUATION2060-ANSI V1 EN-US
* *
× + ×
I V I
B C C
(Equation 69)
*
×
I
BC C
(Equation 70)
*
(Equation 71)
*
)
B
(Equation 72)
*
I )
C
(Equation 73)
*
)
A
(Equation 74)
Bay control REC670
1MRK 511 401-UUS F
SEMOD172134-4 v7
Application manual