Power Quality Analyzer Model 8335
117
The factor in percent [%]
⇔
100
4
c
c
k
k
=
t
The angle in degrees [°]
⇔
4
arctan
ϕ
ϕ
−
=
k
k
k
b
a
with
=
+
⋅
=
+
⋅
=
+
=
+
=
∑
∑
∑
=
=
=
1024
0
0
1024
0
1024
0
2
2
1024
1
512
cos
512
1
512
sin
512
1
s
s
s
k
s
k
s
k
s
k
k
k
k
k
k
F
c
s
k
F
a
s
k
F
b
b
a
ja
b
c
ϕ
π
ϕ
π
c
k
is the amplitude of the component of order
4
k
j
=
with a frequency
4
4
f
k
f
k
=
F
s
is the sampled signal at the fundamental frequency
c
o
is the DC component
k is the index of the pectral spike - the order of the harmonic component is
4
k
j
=
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).
Shop for AEMC products online at:
1.877.766.5412
www.
PowerMeterStore
.ca
