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 134:
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
.
Table 175:
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 61)
Arone
*
*
AB
A
BC
C
S V
I
V
I
=
×
-
×
EQUATION2056-ANSI V1 EN
(Equation 62)
PosSeq
*
3
PosSeq
PosSeq
S
V
I
= ×
×
EQUATION2057-ANSI V1 EN
(Equation 63)
AB
*
*
(
)
AB
A
B
S V
I
I
=
×
-
EQUATION2058-ANSI V1 EN
(Equation 64)
BC
*
*
(
)
BC
B
C
S V
I
I
=
×
-
EQUATION2059-ANSI V1 EN
(Equation 65)
Table continues on next page
1MRK 506 335-UUS A
Section 7
Current protection
285
Technical manual
Summary of Contents for REL650 series
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