ABB Distribution Protection Unit 1500R
10-9
Optional Features
9/99
website:www.abb.com/papd
Zoom Menu
Zooming in allows you to enlarge a selected portion of the
analog wave form. To do this, set the left and right cursors
to the desired range. Then select “Zoom In” from the “Zoom”
Menu. The portion you selected enlarges. Use “Zoom Out”
to return to the original size.
Math Button
At the top of the Main Display window is a button marked “Math.” Press this button to perform math functions associated
with the analog wave forms.
Spectral Analysis
The Spectral Analysis Tool window appears when you click on the Math button. By using this tool, you can create a
spectrum window for a selected region of waveform data.
Follow these steps to perform a spectral analysis:
1.
Click on the Math button at the top of the Main Display window.
2.
The Spectral Analysis Tool window appears.
3.
Select the wave form you want by scrolling up or down in the "Wave Form" box. Double-click on the desired wave
form. An extended cursor appears in place of the left cursor in the window of the selected wave form. (The default
is the uppermost wave form.)
4.
Select the desired sample interval by scrolling up or down in the "Sample Interval" box. Double-click on the interval
you want. The extended cursor in the waveform window changes size accordingly. (Default = 32 or one cycle for a
50-Hz or 60-Hz wave form.)
5.
Move the extended cursor over the section of the wave form on which you want to perform the spectral analysis. Do
this by clicking on the left vertical of the cursor and dragging in the waveform window.
6.
Click on the FFT (Fast Fourier Transformer) button in the Spectral Analysis Tool window. The Spectral Analysis
Display window appears with the generated spectrum. The harmonic content as a percentage of the fundamental
(50 or 60 Hz) appears in the Spectral Analysis Tool window for the harmonics (2nd to the 11th).
7.
As you wish, move the cursor within the Spectral Analysis Display window by clicking the left mouse button in the
region you want. The cursor snaps to that position, and the frequency appears in the "Frequency" box of the
Spectral Analysis Tool window.
8.
Double-click on the upper left corner of the Spectral Analysis Display window to close it, or click on "Done" in the
Spectral Analysis Tool window to remove the Spectral Analysis Display and Spectral Analysis Tool windows.