ABB Relion 670 series - Page 553

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 282.
Table 282: 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-US (Equation 142)
Arone
* *
AB A BC C
S V I V I= × - ×
EQUATION2056-ANSI V1 EN-US (Equation 143)
PosSeq
*
3
PosSeq PosSeq
S V I= × ×
EQUATION2057-ANSI V1 EN-US (Equation 144)
AB
* *
( )
AB A B
S V I I= × -
EQUATION2058-ANSI V1 EN-US (Equation 145)
BC
* *
( )
BC B C
S V I I= × -
EQUATION2059-ANSI V1 EN-US (Equation 146)
CA
* *
( )
CA C A
S V I I= × -
EQUATION2060-ANSI V1 EN-US (Equation 147)
A
*
3
A A
S V I= × ×
EQUATION2061-ANSI V1 EN-US (Equation 148)
B
*
3
B B
S V I= × ×
EQUATION2062-ANSI V1 EN-US (Equation 149)
C
*
3
C C
S V I= × ×
EQUATION2063-ANSI V1 EN-US (Equation 150)
The active and reactive power is available from the function and can be used for monitoring and
fault recording.
The component of the complex power S = P + jQ in the direction Angle1(2) is calculated. If this
angle is 0° the active power component P is calculated. If this angle is 90° the reactive power
component Q is calculated.
The calculated power component is compared to the power pick up setting
Power1(2) . For
directional underpower protection, a pickup signal PICKUP1(2) is activated if the calculated power
component is smaller than the pick up value. For directional overpower protection, a pickup signal
PICKUP1(2) is activated if the calculated power component is larger than the pick up value. After a
set time delay
TripDelay1(2) a trip TRIP1(2) signal is activated if the pickup signal is still active. At
1MRK 502 066-UUS B Section 8
Current protection
547
Technical manual