IM 253401-01E
8-8
8.4 Setting the Harmonic Order and Displaying the Results of Harmonic Analysis
Computation Equation
V=
k=1
n
(Vk)
2
A=
k=1
n
(Ak)
2
W=
k=1
n
W
Vk, Ak, Wk :Each component of 1st to 50th order of voltage, current and active power;
k:Analysis order
n:Maximum order. The maximum order depends on the fundamental frequency of the
input set as the PLL source. Refer to Ch. 15 for more details.
V Hz : Shows the fundamental frequency of the voltage of the PLL source. This frequency
applies only to the element selected as PLL source. For details regarding the PLL source
setting, refer to page 8-3. The measurement range is the same as in case of normal
measurement.
The range of fundamental frequencies in case of harmonic analysis is 40 to 440Hz.
However, depending on internal timing, there are cases where measurements in the 20 to
700Hz range can be performed.
A Hz : Shows the fundamental frequency of the current of the PLL source. The rest is the same
as in case of V Hz.
Note
• In case you select an input element using the ELEMENT key which is not the assigned element for the
harmonic analysis or you selected a display function which is not being analyzed/measured, then the bar
display appears.
• When the harmonic analysis function is turned ON on the WT130, pressing the ELEMENT key will not
result in moving to ∑.
• When pressing the FUNCTION key on display A, and the display function becomes V, A or W, then
display A will show the same analysis items as the V, A or W shown on display C.
• Characteristics such as maximum reading, display range, units, etc. which are not described on the
previous page, are not different from the characteristics of normal measurement.
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