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Power Quality Logger
Using the 1745 Power Quality Logger
33
THD V – In Function A
Function A:
1
50
2
2
V
V
VTHD
n
n
∑
=
=
V
n:
RMS value of harmonic frequency #n.
V
1:
RMS value of the fundamental frequency.
THDV: total contents of harmonics of the line power voltage as a percentage
of the fundamental.
This algorithm is according to EN 61000-4-7.
THD of currents:
Function A:
1
50
2
2
I
I
THDI
n
n
∑
=
=
and
()
∑
=
=
50
2
2
n
n
IATHDI
I
n:
RMS value of harmonic frequency #n.
I
1:
RMS value of the fundamental frequency.
THDI: total contents of harmonics of the current as a percentage of the
fundamental.
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