ABB Relion REC615, 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 ener-
gy measurement (PEMMXU) -
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
* * *
)
(Equation 69)
Once the complex apparent power is calculated, P, Q, S and PF are calculated with
the equations:
P S
=
Re( )
(Equation 70)
Q S
=
Im( )
(Equation 71)
S S P Q
= = +
2 2
(Equation 72)
Cos
P
S
ϕ
=
(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.
1
The value provided is for 50 Hz network. The value for 60 Hz network is 90/36 (=54 Hz)
1MRS758755 C Measurement functions
REC615 & RER615
Technical Manual
575