ABB REC650 ANSI - Page 165

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