METREL MI 2893 - Page 182

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)
Sefund
(effective fundamental
apparent power)
SeN
(effective non fundamental
apparent power)
P
+
fund
(positive sequence of
fundamental active power)
Q
+
fund
(positive sequence of
fundamental reactive power)
DeI
(effective current distortion power)
DeV
(effective voltage distortion power)
SeH
(effective harmonic apparent power)
PH
(effective active harmonic power)
DH
(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 (fundamental + 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.