ABB RER620 Technical Manual page 395

1MAC309294-MB F
RER620
Technical Manual
Table 339: Parameters for deadband calculation
Function
Three-phase current
measurement (IA, IB, IC)
Three-phase voltage
measurement (VA, VB, VC)
Ground current measurement
(IG)
Ground voltage measurement
(VG)
Phase sequence current
measurement (I1, I2, I0)
Phase sequence voltage
measurement (V1, V2, V0)
Three-phase power and energy
measurement (P, E)
In the three-phase power and energy measurement function, P, E, the
deadband supervision is done separately for apparent power S, with the
pre-set value of fixed 10 percent of the Sn and the power factor PF, with
the pre-set values fixed at 0.10. All the power measurement related values
P, Q, S and PF are reported simultaneously when either one of the S or PF
values exceeds the pre-set limit.
Power and energy calculation
The three-phase power is calculated from the phase-to-ground voltages and
phase-to-ground currents. The power measurement function is capable of calculating
complex power based on the fundamental frequency component phasors (DFT).
* *
S = ⋅ + ⋅ +
(V I V I V
A A B B
Once the complex apparent power is calculated, P, Q, S and PF are calculated with the
equations:
= Im( )
Q S
= Im( )
Q S
2 2
= = +
S S P Q
P
 =
Cos
S
Depending on the unit multiplier selected with Power unit Mult, the calculated power
values are presented in units of kVA/kW/kVAr or in units of MVA/MW/MVAr.
Settings
A deadband
V Deadband
A deadband res
V deadband res
Ps Seq A deadband, Ng Seq A
deadband, Zro A deadband
Ps Seq V deadband, Ng Seq V
deadband, Zro V deadband
-
*
⋅
I )
C C
Section 7
Measurement functions
Maximum/minimum (=range)
40 / 0 (=40xIn)
4 / 0 (=4xVn)
40 / 0 (=40xIn)
4 / 0 (=4xVn)
40 / 0 (=40xIn)
4/0 (=4xVn)
(Equation 44)
(Equation 45)
(Equation 46)
(Equation 47)
(Equation 48)
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