ABB Relion 670 series, Technical Reference Manual

Page: 486 / 1232

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
240 .
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