ABB REB670 Applications Manual page 224

Section 7
Current protection
218
Table 34: Complex power calculation
Mode
Set value
A,B,C
Arone
PosSeq
A,B
B,C
C,A
A
B
C
The function has two stages that can be set independently.
With the parameter OpMode1(2) the function can be set Enabled/Disabled.
The function gives trip if the power component in the direction defined by the setting
Angle1(2) is larger than the set pick up power value Power1(2)
Formula used for complex power calculation
* *
= × + ×
S V I V I
A A B B
EQUATION2038 V1 EN
*
-
= × ×
S V I V
A
AB BC
EQUATION2039 V1 EN
*
= × ×
S 3 V I
PosSeq PosSeq
EQUATION2040 V1 EN
*
*
-
= ×
)
S V (I I
A B
AB
EQUATION2041 V1 EN
*
*
-
= ×
)
S V (I I
BC B C
EQUATION2042 V1 EN
*
*
-
= ×
)
S V (I I
C A
CA
EQUATION2043 V1 EN
*
= × ×
S 3 V I
A A
EQUATION2044 V1 EN
*
= × ×
S 3 V I
B B
EQUATION2045 V1 EN
*
= × ×
S 3 V I
C C
EQUATION2046 V1 EN
1MRK 505 337-UUS -
*
+ ×
V I
C C
(Equation 58)
*
I
C
(Equation 59)
(Equation 60)
(Equation 61)
(Equation 62)
(Equation 63)
(Equation 64)
(Equation 65)
(Equation 66)
Application manual