YOKOGAWA WT500 User Manual page 57

2.8 Trend, Bar Graph, and Vector Displays
Bar Graph Display of Harmonic Data (See section 6.7 for operating instructions)
Vector Display of Harmonic Data (See section 6.8 for operating instructions)
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On models with the harmonic measurement option, you can display harmonics using bar
graphs. The harmonic orders are lined up on the horizontal axis, and the vertical axis
represents the amplitude of each harmonic. You can choose which harmonic function,
element, and orders to display. The selectable harmonic measurement functions are U, I,
P, S, Q, λ, f, fU, and fI.
Bar graph of voltage U1
Bar graph of current I1
On models with the harmonic measurement option, you can select a wiring unit to
display vectors of the phase differences and amplitudes (rms values) of the fundamental
signals, U(1) and I(1), in each element in the unit. The positive vertical axis is set to zero
(angle zero), and the vector of each input signal is displayed. You can also zoom in on
vectors or display amplitude values and the phase difference values between signals
simultaneously.
The vector display is shown on the next page.
The elements whose vectors are displayed vary depending on the number of installed
input elements and the selected wiring pattern.
The following explanation is of the vector assignments when the number of input
elements is three and when the wiring system of wiring unit Σ is set to three-phase, four-
wire.
The vectors of elements 1, 2, and 3 are displayed. Vectors 1, 2, and 3 correspond to
elements 1, 2, and 3, respectively. The relationships between the phase differences and
amplitudes of U1(1), U2(1), U3(1), I1(1), I2(1), and I3(1) are displayed as vectors.
IM 760201-01E