ABB Relion 670 series - Page 561

Table 290: 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-US (Equation 152)
Arone
* *
A C
AB BC
S V I V I= × ×-
EQUATION2039 V1 EN-US (Equation 153)
PosSeq
*
PosSeq
PosSeq
S 3 V I= × ×
EQUATION2040 V1 EN-US (Equation 154)
A,B
*
A B
AB
*
S V (I I )= × -
EQUATION2041 V1 EN-US (Equation 155)
B,C
*
B C
BC
*
S V (I I )= × -
EQUATION2042 V1 EN-US (Equation 156)
C,A
*
C A
CA
*
S V (I I )= × -
EQUATION2043 V1 EN-US (Equation 157)
A
*
A
A
S 3 V I= × ×
EQUATION2044 V1 EN-US (Equation 158)
B
*
B
B
S 3 V I= × ×
EQUATION2045 V1 EN-US (Equation 159)
C
*
C
C
S 3 V I= × ×
EQUATION2046 V1 EN-US (Equation 160)
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) . 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 activation of any of the two stages a common signal PICKUP will be activated. At trip
from any of the two stages also a common signal TRIP will be activated.
To avoid instability there is a settable hysteresis in the power function. The absolute hysteresis of
the stage1(2) is
Hysteresis1(2) = abs (Power1(2) – drop-power1(2)). For generator reverse power
protection the power setting is very low, normally down to 0.02 p.u. of rated generator power. The
1MRK 502 066-UUS B Section 8
Current protection
555
Technical manual