ABB RELION Series, Техническое руководство

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Function Settings Maximum/minimum (=range)
Frequency measurement
(FMMXU)
F deadband
75/35 (=40 Hz) 1)
Phase sequence current
measurement (CSMSQI)
Ps Seq A deadband, Ng Seq A
deadband, Zro A deadband
40/0 (=40xIn)
Phase sequence voltage
measurement (VSMSQI)
Ps Seq V deadband, Ng Seq V
deadband, Zro V deadband
4/0 (=4xUn)
Three-phase power and energy
measurement (PEMMXU)
-
1) The value provided is for 50 Hz network. The value for 60 Hz network is 90/36 (=54 Hz)
In the three-phase power and energy measurement function
PEMMXU, 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 69)
Once the complex apparent power is calculated, P, Q, S and PF are calculated with the
equations:
P S
=
Re( )
GUID-92B45FA5-0B6B-47DC-9ADB-69E7EB30D53A V3 EN
(Equation 70)
Q S
=
Im( )
GUID-CA5C1D5D-3AD9-468C-86A1-835525F8BE27 V2 EN
(Equation 71)
S S P Q
= = +
2 2
GUID-B3999831-E376-4DAF-BF36-BA6F761230A9 V2 EN
(Equation 72)
Cos
P
S
ϕ
=
GUID-D729F661-94F9-48B1-8FA0-06E84A6F014C V2 EN
(Equation 73)
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.
1MRS758755 A
Section 8
Measurement functions
REC615 and RER615 559
Technical Manual