Function Settings Maximum/minimum (=range)
Frequency measurement
(FMMXU)
F deadband 75 / 35 (=40Hz)
Sequence current
measurement (CSMSQI)
Ps Seq A deadband
,
Ng Seq A
deadband
,
Zro A deadband
40 / 0 (=40xIn)
Sequence voltage
measurement (VSMSQI)
Ps Seq V deadband
,
Ng Seq V
deadband
,
Zro V deadband
4/0 (=4xUn)
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 U I
A
A
B
B
C
C
* * *
)
GUID-8BF2FBFE-B33B-4B49-86AA-C1B326BBBAC1 V1 EN (Equation 83)
Once the complex apparent power is calculated, P, Q, S and PF are calculated with
the equations:
GUID-92B45FA5-0B6B-47DC-9ADB-69E7EB30D53A V3 EN (Equation 84)
GUID-CA5C1D5D-3AD9-468C-86A1-835525F8BE27 V2 EN (Equation 85)
GUID-B3999831-E376-4DAF-BF36-BA6F761230A9 V2 EN (Equation 86)
GUID-D729F661-94F9-48B1-8FA0-06E84A6F014C V2 EN (Equation 87)
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.
1YHT530004D05 D Section 8
Measurement functions
615 series 631
Technical Manual
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