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c
=
b
+
j a
=
k
k
k
1024
1
∑
b
F
sin
=
⋅
k
s
512
with
s
=
0
1024
1
∑
a
=
F
⋅
cos
k
s
512
s
=
0
1024
1
∑
c
F
=
0
s
1024
s
=
0
c
is the amplitude of the component of order
k
F
is the sampled signal at the fundamental frequency
s
c
is the DC component
o
k
is the index of the pectral spike - the order of the harmonic component is
NOTE: The power harmonic factors are calculated by multiplying the phase-to-neutral voltage harmonic factors by the
current harmonic factors. The power harmonic angles (VAharm[i][j] and VAph[i][j]) are calculated by differentiating the
phase-to-neutral voltage harmonic angles with the current harmonic angles. In the case of a 2-wire two-phase distribution
source, the phase-to-neutral voltage V1 is replaced by the phase-to-phase voltage U1 and one obtains the harmonic
power levels UAharm[0][j] and the harmonic power angles UAph[0][j].
A.1.3.2 HARMONIC DISTORTIONS
Two global values giving the relative quantity of harmonics are calculated: the THD as a proportion of the fundamental
(THD-F) and the DF as a proportion of the RMS value (THD-R).
Total harmonic distortion of phase (i+1) with i ∈ [0 ; 2] (THD or THD-F).
Total harmonic distortion of channel (i+1) with i ∈ [0 ; 3] (DF or THD-R).
The THD as a proportion of the RMS-AC value (THD-R) is also called the distortion factor (DF).
A.1.3.3 HARMONIC LOSS FACTOR (EXCLUDING NEUTRAL – OVER 4 CONSECUTIVE CYCLES
EVERY SECOND)
Harmonic loss factor of the phase (i+1) with i ∈ [0 ; 2]:
114
Find Quality Products Online at:
2
2
a
+
b
k
k
π
k
s
ϕ
+
k
512
k
π
ϕ
s
+
k
512
GlobalTestSupply
www.
k
f
=
f
with a frequency
k
4
4
.com
Power Quality Analyzer PowerPad
sales@GlobalTestSupply.com
®
III Model 8435
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