METREL MI 2885, Manual

Page: 182 / 241

MI 2893 / MI 2892 / MI 2885 Measurement methods
182
In table below summary of all power measurement is shown.
Table 135: Summary and grouping of the phase power quantities
Quantity Combined
powers Fundamental
powers Nonfundamental
Powers
Apparent (VA) S S
fund
S
N
, S
H
Active (W) P P
fund
P
H
Nonactive/reactive (var) N Q
fund
D
I
, D
V
, D
H
Line utilization PF
ind/cap
DPF
ind/cap
-
Harmonic pollution (%) - - S
N
/S
fund
Power measurement for three phase systems are slightly different as shown on figure below.
Se
(effective apparent
power)
Se
fund
(effective fundamental
apparent power)
Se
N
(effective non fundamental
apparent power)
P
+
fund
(positive sequence of
fundamental active power)
Q
+
fund
(positive sequence of
fundamental reactive power)
De
I
(effective current distortion power)
De
V
(effective voltage distortion power)
Se
H
(
effective harmonic apparent power)
P
H
(effective active harmonic power)
D
H
(effective harmonic distortion power)
S
+
fund
(positive sequence of
fundamental apparent power)
Su
(unbalanced fundamental
apparent power)
Figure 151: IEEE 1459 phase power measurement organisation (totals)
Table 136: Power summary and grouping of the total power quantities
Quantity Combined
powers Fundamental
powers Nonfundamental
Powers
Apparent (VA) Se Se
fund
, S
+
, Su Se
N
, Se
H
Active (W) P P
+
tot
P
H
Nonactive/reactive (var) N Q
+
tot
De
I
, De
V
, De
H
Line utilization PF
ind/cap
DPF
+
tot ind/cap
-
Harmonic pollution (%) - - Se
N
/S
fund
Combined phase power measurements
Standard compliance: IEEE STD 1459-2010
All combined (funda nonfundamental) active power measurements represent RMS values of
the samples of instantaneous power over a 10/12-cycle time interval. Each 10/12-cycle interval is
contiguous and non-overlapping.