ABB REC650 Technical Manual page 156

Section 6
Current protection
150
Chosen current
phasors
Complex
power
Chosen voltage
calculation
phasors
IEC09000018 V2 EN
Figure 66: Simplified logic diagram of the power protection function
The function will use voltage and current phasors calculated in the pre-processing
blocks. The apparent complex power is calculated according to chosen formula as
shown in table 103.
Table 103: Complex power calculation
Mode
Set value:
L1, L2, L3
Arone
PosSeq
L1L2
L2L3
L3L1
Table continues on next page
P
Derivation of S(angle)
S(composant)
in Char angle
Q
Formula used for complex power calculation
= ×
S U
L 1
EQUATION1697 V1 EN
=
S U
L L 1 2
EQUATION1698 V1 EN
= ×
S 3 U
PosSeq
EQUATION1699 V1 EN
=
S U
L L 1 2
EQUATION1700 V1 EN
=
S U
L L 2 3
EQUATION1701 V1 EN
=
S U
L L 3 1
EQUATION1702 V1 EN
1MRK 511 287-UEN A
t
S(angle) <
Power1
START1
t
S(angle) <
Power2
START2
P = POWRE
Q = POWIM
IEC09000018-2-en.vsd
* * *
+ × + ×
I U I U I
L 1 L 2 L 2 L 3 L 3
(Equation 21)
* *
× - ×
I U I
L 1 L L 2 3 L 3
(Equation 22)
*
×
I
PosSeq
(Equation 23)
* *
× -
( I I )
L 1 L 2
(Equation 24)
* *
× -
( I I )
L 2 L 3
(Equation 25)
* *
× -
( I I )
L 3 L 1
(Equation 26)
Technical manual
TRIP1
TRIP2