Setting Guidelines - ABB REG670 Applications Manual

Section 9
Current protection
9.10.3
378
Underpower protection
Q
Operate
Line
Margin
P
Operating point
without
turbine torque
IEC09000019 V2 EN
Figure 195: Reverse power protection with underpower or overpower protection

Setting guidelines

GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
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 41.
Table 41: Complex power calculation
Set value Mode
L1, L2, L3
Arone
PosSeq
L1L2
L2L3
L3L1
Table continues on next page
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Overpower protection
Q
Operate
Line
Margin
Operating point
without
turbine torque
IEC09000019-2-en.vsd
Formula used for complex power calculation
=
S U
L
EQUATION1697 V1 EN
=
S U
L L
EQUATION1698 V1 EN
= ×
S 3 U
EQUATION1699 V1 EN
=
S U
L L
EQUATION1700 V1 EN
=
S U
L L
EQUATION1701 V1 EN
=
S U
L L
EQUATION1702 V1 EN
1MRK 502 071-UEN -
P
* *
× + × + ×
I U I U I
1 L 1 L 2 L 2 L 3
* *
× - ×
I U I
1 2 L 1 L L 2 3 L 3
*
×
I
PosSeq PosSeq
* *
× -
( I I )
1 2 L 1 L 2
* *
× -
( I I )
2 3 L 2 L 3
* *
× -
( I I )
3 1 L 3 L 1
Application manual
*
L 3
(Equation 213)
(Equation 214)
(Equation 215)
(Equation 216)
(Equation 217)
(Equation 218)