SATEC PM180 Operation Manual - Manual (Page 150)

‎Chapter 14 Viewing Log Files Viewing Waveforms
148 PM180 Substation Automation Unit
If you leave the Triangle box checked, PAS connects the ends of the voltage and
current vectors showing you three-phase voltage and current triangles. This is useful
when analyzing voltage and current unbalances.
Phasor diagrams are calculated over one waveform cycle pointed to by the left
marker line. As you move the marker, the phasor diagrams are updated reflecting the
new marker position.
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.
Selecting Primary and Secondary Units
Voltages and currents can be displayed in primary or secondary units. To select units
for your waveforms, click on the waveform window with the right mouse button, select
“Options...”, select the desired units for voltages and currents on the Channels tab,
and then click OK.
Using the Marker Lines
Waveform and RMS panes have two blue dashed marker lines. The left marker
indicates the position from where data is taken to calculate the harmonics spectrum
and phasor diagrams, and also as the starting position for calculating the RMS,
average and peak values. The right marker indicates the end position for calculating
the RMS, average and peak values. The minimum distance between the two markers
is exactly one cycle.
To change the marker position, click on the button, or click on the waveform
window with the right mouse button and select Set Marker, and then click on the
point where you want to put the marker. You can drag both markers with the mouse,
or use the right and left arrow keys on your keyboard to change the marker position.
Click on the waveform pane to allow the keyboard to get your input before using the
keyboard.
Using a Zoom
You can use a horizontal and a vertical zoom to change size of your waveforms. Use
the buttons
on you local toolbar representing green arrowheads to
zoom in or out of the waveform graph. Every click on these buttons gives you a 100-
percent horizontal or 50-percent vertical zoom. Two buttons
give you a
proportional zoom in both directions.
When in the overlapped waveform view, you can zoom in on a selected waveform
region. Click on the waveform window with the right mouse button, click 'Zoom', point
onto one of the corners of the region you want to zoom in, press and hold the left