ABB REC650 ANSI Technical Manual page 165

1MRK 511 287-UUS A
Technical manual
Chosen current
phasors
Complex
power
Chosen voltage
calculation
phasors
ANSI06000438 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:
A, B, C
Arone
PosSeq
AB
BC
Table continues on next page
P
Derivation of
S( angle)
S( composant)
in Char angle
Q
Formula used for complex power calculation
= ×
S V I
A
EQUATION2055-ANSI V1 EN
=
S V
AB
EQUATION2056-ANSI V1 EN
= ×
S 3 V
PosSeq
EQUATION2057-ANSI V1 EN
= ×
S V
AB
EQUATION2058-ANSI V1 EN
= ×
S V
BC
EQUATION2059-ANSI V1 EN
Section 6
Current protection
S( angle) < t TRIP 1
Power1
0
PICKUP1
S( angle) < t TRIP2
Power2
0
PICKUP2
P = POWRE
Q = POWIM
ANSI06000438-2-en.vsd
* * *
+ × + ×
V I V I
A B B C C
(Equation 21)
* *
× - ×
I V I
A BC C
(Equation 22)
*
×
I
PosSeq
(Equation 23)
* *
-
( I I )
A B
(Equation 24)
* *
-
( I I )
B C
(Equation 25)
159