YOKOGAWA WT3002E User Manual page 111

7.1 Harmonic Measurement Function
Bar Graph Display «For procedures, see section 7.7.»
Vector Display «For procedures, see section 7.8.»
7-8
The amplitude of each harmonic can be displayed on the bar graph. The horizontal
axis represents harmonic order, and the vertical axis represents the amplitude of each
harmonic. The harmonic measurement functions, elements, and order to be displayed
can be specified. You can select the following harmonic measurement functions: U, I, P,
S, Q, λ, φ, φU, φI, Z, Rs, Xs, Rp, and Xp. The screen can be divided into top and bottom
halves so that the bar graph can be displayed simultaneously with the numeric data. Bar
graphs cannot be displayed in IEC harmonic measurement mode.
Bar graph display
Cursor +
Cursor ×
During harmonic measurement, vectors can be displayed to show the relationship
between the phase difference and amplitude (rms value) of the fundamental signals U(1)
and I(1) of each element that is assigned to the selected wiring unit. The positive vertical
axis is set to 0 (angle 0), and the vector of each input signal is displayed. In addition, you
can zoom in on the vector or display the values of the amplitude and the phase difference
between the signals simultaneously.
The vector display is shown on the next page.
The elements that are to be displayed as vectors vary depending on the number of
installed input elements and the selected wiring pattern.
Explanation is given for the case when the number of installed input elements is 4 and
wiring unit ΣA is set to a three-phase, four-wire system.
When the target of the vector display is set to wiring unit ΣA, the target elements are
1, 2, and 3. Vectors 1, 2, and 3 correspond to elements 1, 2, and 3, respectively. The
relationship between the phase difference and amplitude of U1(1), U2(1), U3(1), I1(1),
I2(1), and I3(1) is displayed as vectors.
Vectors cannot be displayed in IEC harmonic measurement mode.
Measured values at cursors
+ and × of bar graph 1
Measured values at cursors
+ and × of bar graph 2
Order indicating the cursor position
This indicates that cursors + and ×
are at the 1st order and 15th order
positions, respectively.
IM WT3001E-51EN