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IM 760401-01E
7.4 Setting the Harmonic Order and Displaying the Measured Harmonic Value
• Display C
• V: Shows each rms (computed) value of the 1st to 50th harmonic component of
the voltage;
• A: Shows each rms (computed) value of the 1st to 50th harmonic component of
the current;
• W: Shows each rms (computed) value of the 1st to 50th harmonic component of
the active power;
Computation Equation
n
2
V=
(V
)
k
k=1
n
2
A=
(A
)
k
k=1
n
W=
W
k
k=1
•
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 Chapter 16 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 7-4. The measurement range is
the same as in case of normal measurement.
The range of fundamental frequencies in case of harmonic measurement is 40
to 440 Hz. However, depending on internal timing, there are cases where
measurements in the 20 to 700 Hz 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 measurement or you selected a display function which is not being
measured, then the bar display appears.
•
When the harmonic measurement function is turned ON on the WT230, pressing the
ELEMENT key will not result in moving to Σ.
•
When pressing the FUNCTION key on display A, and the display function becomes V, A or
W, then display A will show the same measured items as the V, A or W shown on display C.
•
Characteristics such as maximum reading, display range, units, and prefix. which are not
described on the previous page, are not different from the characteristics of normal
measurement.
7
7-9
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