ABB RET650 Technical Manual page 201

1MRK 504 135-UEN A
Technical manual
Chosen current
phasors
Complex
power
Chosen voltage
calculation
phasors
IEC09000018 V2 EN
Figure 88: 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 122.
Table 122: 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
Section 8
Current protection
t
S(angle) <
Power1
t
S(angle) <
Power2
P = POWRE
Q = POWIM
IEC09000018-2-en.vsd
* *
+ × + ×
I U I U I
L 1 L 2 L 2 L 3 L 3
(Equation 57)
* *
× - ×
I U I
L 1 L L 2 3 L 3
(Equation 58)
*
×
I
PosSeq
(Equation 59)
* *
× -
( I I )
L 1 L 2
(Equation 60)
* *
× -
( I I )
L 2 L 3
(Equation 61)
* *
× -
( I I )
L 3 L 1
(Equation 62)
TRIP1
START1
TRIP2
START2
*
195