ABB Relion 670 Series Applications Manual page 195

1MRK 511 401-UEN Rev. K
Underpower protection
Operate
Line
Margin
Operating point
without
turbine torque
IEC09000019 V2 EN-US
Figure 91: 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 , UBase
and SBase . Note that this function will only use IBase value.
Operation : With the parameter Operation the function can be set On / Off .
Mode : The voltage and current used for the power measurement. The setting possibilities are
shown in table 27.
Table 27:
Set value
L1, L2, L3
Arone
PosSeq
L1L2
L2L3
L3L1
Table continues on next page
Bay control REC670
Application manual
Overpower protection
Q
Operate
Line
Margin
P
Operating point
without
turbine torque
Complex power calculation
Mode
© Copyright 2017 Hitachi Power Grids. All rights reserved
Q
P
IEC09000019-2-en.vsd
Formula used for complex power calculation
*
= × +
S U I U
L 1 L 1 L
EQUATION1697 V1 EN-US
*
= × -
S U I U
L L 1 2 L 1
EQUATION1698 V1 EN-US
= × ×
S 3 U I
PosSeq PosSeq
EQUATION1699 V1 EN-US
*
= × -
S U ( I
L L 1 2 L 1
EQUATION1700 V1 EN-US
*
= × -
S U ( I
L L 2 3 L 2
EQUATION1701 V1 EN-US
*
= × -
S U ( I
L L 3 1 L 3
EQUATION1702 V1 EN-US
* *
× + ×
I U I
2 L 2 L 3 L 3
(Equation 69)
*
×
I
L L 2 3 L 3
(Equation 70)
*
(Equation 71)
*
I )
L 2
(Equation 72)
*
I )
L 3
(Equation 73)
*
I )
L 1
(Equation 74)
Section 8
Current protection
SEMOD172134-4 v7
189