t s s( )
( ) /
. . %
=
− ×
− ×
=
40 0 2500 1000
0 40 0 30 100
10
GUID-D1C387B1-4F2E-4A28-AFEA-431687DDF9FE V1 EN
Table 792: Parameters for deadband calculation
Function
Settings Maximum/minimum (=range)
Three-phase current
measurement (IA, IB, IC)
A deadband 40/0 (=40xIn)
Three-phase voltage
measurement (VA, VB, VC)
V Deadband 4/0 (=4xVn)
Ground current measurement
(IG)
A deadband res 40/0 (=40xIn)
Ground voltage measurement
(VG)
V deadband res 4/0 (=4xVn)
Frequency measurement (f)
F deadband
75/35 (=40 Hz)
1)
Phase sequence current
measurement (I1, I2, I0)
Ps Seq A deadband
,
Ng Seq A
deadband
,
Zro A deadband
40/0 (=40xIn)
Phase sequence voltage
measurement (V1, V2, V0)
Ps Seq V deadband
,
Ng Seq V
deadband
,
Zro V deadband
4/0 (=4xVn)
Three-phase power and energy
measurement (P, E)
-
1) The value provided is for REF615, RET615 and REM615 in 50 Hz network. The value for 60 Hz network is
90/36 (=54 Hz). For REG615 the values are 75/10 (=65 Hz) in 50 Hz network and 90/12 (=78 Hz) in 60 Hz
network.
In the power and energy measurement functions P, E and SP, SE, 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 single-phase and three-phase power is calculated from the phase-to-ground voltages
and phase-to-ground currents. The power measurement function is capable of calculating
a complex power based on the fundamental frequency component phasors (DFT).
S = ⋅ + ⋅ + ⋅(V I V I V I
A
A
B
B
C
C
* * *
)
GUID-8BF2FBFE-B33B-4B49-86AA-C1B326BBBAC1-ANSI V1 EN (Equation 165)
Once the complex apparent power is calculated, P, Q, S and PF are calculated with the
equations:
1MAC059074-MB A Section 8
Measurement functions
615 series ANSI 903
Technical Manual
To Next Page
Loading...
