W(W)
Active power
φ
II(
◦
)
Phase difference of harmonic current I(k) and fundamental waveI(1)
S(VA)
Apparent power
U(%r)/ U(%f)
Harmonic distortion factor of voltage
Q(var)
Reactive power
A(%r)/ A(%f)
Harmonic distortion factor of current
λ
()
Power factor
W(%r)/W(%f)
Harmonic distortion factor of active power
Table 6.2: Measurement Parameters
Figure 6.1: Harmonic Measurement Setup Menu
6.2.1
Parameter descriptions:
Distortion factor calculation formula:
The following two formulas can be selected for calculation of the distortion factor.
%r using all harmonic measurement data from the minimum harmonic order (0) to the maximum harmonic order
(within the upper limit of analysis orders) as the denominator.
%f using the data of fundamental wave (1-order) components as the denominator.
Parameters
Instruction
THD Formal
Distortion factor calculation formula. % r: displaying harmonics in the form of
percentage to the overall current (voltage, power) amplitude of all harmonics. % f:
displaying harmonics in the form of percentage to the fundamental wave current
(voltage, power).
PLL Source
Select the PLL (Phase Locked Loop) source: U/I/OFF. Used for determining the
fundamental wave cycle as the reference for analysis of harmonic orders.
Serial
Harmonic sequence: whole sequence/odd sequence/even sequences
Order Max
Set the harmonic analysis orders (1-50). You can specify the harmonic measurement
range. These specified analysis orders are used for calculating the value of the
distortion factor.
