MI 2892 Power Master
Theory and internal operation
156
where:
1
1
1
fund
P
P
P
H
,
2
2
2
fund
P
P
P
H
,
3
3
3
fund
P
P
P
H
Total effective distortion power
2
2
H
H
H
P
Se
De
[var]
(36)
Harmonic pollution
100
tot
N
fund
tot
Se
Se
HP
[%]
where:
fund
fund
fund
Ie
Ue
Se
tot
3
(37)
Load unbalance
tot
fund
S
Su
LU
(38)
5.1.6
Classic Vector and Arithmetic Power measurement
Standard compliance: IEC 61557-12
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 classic Vector and Arithmetic power measurement defined in the latest
IEC 61557-12 standard (Annex A) and IEEE 1459 (Section 3.2.2.5 and 3.2.2.6). There is large number of
measurement equipment installed on various points on network where this measurement algorithms
are used for measurement and recording. In order to compare past measurement with current, use one
of classic Power measurement. The measurements for active, reactive, and apparent powers has
physical meaning as long as the current and voltage waveforms remained nearly sinusoidal. On figure
below graphical interpretation of Vector and Arithmetic power measurements are shown.
P
1
P
2
P
3
Q
1
Q
2
Q
3
S
1
S
2
S
3
S
v
Q
v
P
tot
P
1
P
2
P
3
Q
1
Q
2
Q
3
S
1
S
2
S
3
S
a
Figure 5.4: Vector representation of total
power calculus
Figure 5.5: Arithmetic representation of total power
calculus
