MI 2892 Power Master
Theory and internal operation
151
Frequency measurement is performed on chosen Synchronization channel, in CONNECTION SETUP
menu.
5.1.5
Modern Power measurement
Standard compliance: IEEE 1459-2010
See section 3.21.6 how to select Modern Power measurement method. Please note that instrument
record all measurement (Classic and Modern), regardless of selected method.
Instrument fully complies with power measurement defined in the latest IEEE 1459 standard. The old
definitions for active, reactive, and apparent powers are valid as long as the current and voltage
waveforms remained nearly sinusoidal. This is not the case today, where we have various power
electronics equipment, such as Adjustable Speed Drives, Controlled Rectifiers, Cycloconverters,
Electronically Ballasted Lamps. Those represent major nonlinear and parametric loads proliferating
among industrial and commercial customers. New Power theory splits power to fundamental and
nonfundamental components, as shown on figure below.
S
(apparent power)
S
fund
(fundamental apparent power)
S
N
(non fundamental apparent power)
P
fund
(fundamental active power)
Q
fund
(fundamental reactive power)
D
I
(
current distortion power)
D
V
(voltage distortion power)
S
H
(
harmonic apparent power)
P
H
(active harmonic power)
D
H
(harmonic distortion power)
Figure 5.2: IEEE 1459 phase power measurement organisation (phase)
In table below summary of all power measurement is shown.
Table 5.1: 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.
