ANSI06000567-2-en.vsd
Chosen current
phasors
Chosen voltage
phasors
Complex
power
calculation
P
Derivation of
S(composant)
in Char angle
S(angle)
S(angle) >
Power1
t
TRIP1
PICKUP1
Q
P = POWRE
Q = POWIM
S(angle) >
Power2
t
TRIP2
PICKUP2
ANSI06000567 V2 EN
Figure 243:
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 240:
Complex power calculation
Set value:
Mode
Formula used for complex power calculation
A,B,C
*
*
*
A
B
C
A
B
C
S V
I
V
I
V
I
=
×
+
×
+
×
EQUATION2038 V1 EN
(Equation 107)
Arone
*
*
A
C
AB
BC
S V
I
V
I
=
×
×
-
EQUATION2039 V1 EN
(Equation 108)
PosSeq
*
PosSeq
PosSeq
S 3 V
I
= ×
×
EQUATION2040 V1 EN
(Equation 109)
A,B
*
A
B
AB
*
S
V
(I
I
)
=
×
-
EQUATION2041 V1 EN
(Equation 110)
B,C
*
B
C
BC
*
S
V
(I
I
)
=
×
-
EQUATION2042 V1 EN
(Equation 111)
Table continues on next page
Section 7
1MRK505222-UUS C
Current protection
480
Technical reference manual
Содержание Relion 670 series
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