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The factor in percent [%] ⇔
The angle in degrees [°] ⇔
with
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.
Harmonic Distortions
(excluding neutral – over 4 consecutive cycles every second)
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).
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Power Quality Analyzer Model 8335
t
k
ϕ
=
k
c
=
b
+
j a
=
k
k
k
1024
1
∑
b
=
F
k
s
512
s
=
0
1024
1
∑
a
=
F
k
s
512
s
=
0
1024
1
∑
c
=
F
0
s
1024
s
=
0
PowerMeterStore
www.
c
k
=
100
c
4
a
k
ϕ
arctan
−
b
k
2
2
a
+
b
k
k
π
k
ϕ
⋅
sin
s
+
k
512
π
k
ϕ
⋅
cos
s
+
k
512
j =
4
k
4
with a frequency
1.877.766.5412
.ca
k
f
f
=
k
4
4
k
j =
4
117
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