99
Equations
Harmonic voltage
RMS value
[V]
–
2
2
ki
kr
U
U
+
Harmonic content
percentage for
k
th order
[%]
–
[ ]
%
100
2
1
2
1
2
2
×
+
+
i
r
ki
kr
U
U
U
U
Total harmonic distortion
[%]
THD-F
(
)
100
2
1
2
1
30
2
2
2
×
+
+
∑
=
i
r
k
ki
kr
U
U
U
U
[ ]
%
THD-R
(
)
( )
100
'
2
256
1
30
2
2
2
×
+
∑
∑
=
=
n
n
k
ki
kr
U
U
U
[ ]
%
Index
k
: Analyzed order
r
: Post-FFT resistance component
i
: Post-FFT reactance component
I
′
: Current sampling value
U
′
: Voltage sampling value
HIOKI CM3286C961-00
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