ABB RED615 Technical Manual page 637

1YHT530004D05 D
615 series
Technical Manual
Function
Frequency measurement
(FMMXU)
Sequence current
measurement (CSMSQI)
Sequence voltage
measurement (VSMSQI)
In the three-phase power and energy measurement function,
PEMMXU/MPEMMXU, the deadband supervision is done
separately for apparent power S, with the preset value of fixed 10
percent of the Sn and the power factor PF, with the preset 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 preset limit.
Power and energy calculation
The three-phase power is calculated from the phase-to-earth voltages and phase-to-
earth currents. The power measurement function is capable of calculating a
complex power based on the fundamental frequency component phasors (DFT).
* *
S = ⋅ + ⋅ +
(U I U I
A A B B
GUID-8BF2FBFE-B33B-4B49-86AA-C1B326BBBAC1 V1 EN
Once the complex apparent power is calculated, P, Q, S and PF are calculated with
the equations:
P = Re( ) S
GUID-92B45FA5-0B6B-47DC-9ADB-69E7EB30D53A V3 EN
= Im( )
Q S
GUID-CA5C1D5D-3AD9-468C-86A1-835525F8BE27 V2 EN
2 2
S S P Q
= = +
GUID-B3999831-E376-4DAF-BF36-BA6F761230A9 V2 EN
P
Cos
ϕ =
S
GUID-D729F661-94F9-48B1-8FA0-06E84A6F014C V2 EN
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
F deadband
Ps Seq A deadband , Ng Seq A
deadband , Zro A deadband
Ps Seq V deadband , Ng Seq V
deadband , Zro V deadband
*
⋅
U I )
C C
Section 8
Measurement functions
Maximum/minimum (=range)
75 / 35 (=40Hz)
40 / 0 (=40xIn)
4/0 (=4xUn)
(Equation 83)
(Equation 84)
(Equation 85)
(Equation 86)
(Equation 87)
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