Chapter 7 Monitoring Meters
Viewing Real-time Waveforms
PM135 Powermeter Series
125
Figure
7-2: RT Waveform Monitor Window
Viewing a Frequency Plot
Click on the
button to view a cycle-by-cycle frequency plot for the
sampled voltage waveforms.
Viewing a Harmonic Spectrum
Click on the
button to view a spectrum chart for the selected
waveform channel. PAS provides voltage, current, active power and
reactive power spectrum charts. See
Viewing Real-time Harmonic
Spectrum
for more information on viewing options.
Viewing Phasor Diagrams
The phasor diagrams show you relative magnitudes and angles of the
three-phase voltage and current fundamental component. All angles are
shown relative to the reference voltage channel.
To change the reference channel, click on the waveform window with the
right mouse button, select
Options...,
click on the
Phasor
tab, check the
channel you want to make a reference channel, and then click
OK
.
Viewing Symmetrical Components
Waveform views have an additional pane at the right where PAS displays
the symmetrical components for voltages and currents, calculated for the
point indicated by the left marker line.
To enable or disable the symmetrical components, click on the waveform
window with the right mouse button, select
Options...,
check or uncheck
the
Symmetrical components
box on the
Channels
tab, and then click
OK
.
Viewing Phase-to-phase Voltages
PAS can transform phase-to-neutral voltage waveforms in configurations
with a neutral into phase-to-phase waveforms allowing you to view the
waveshape, angle relationships and harmonics of the phase-to-phase
voltages.
Click on the
button on the waveform window toolbar. Click the button
once again to return to phase-to-neutral waveforms.
