E-Mon E-PS-E-RTU-N - Manual (Page 120)

Chapter 7 Monitoring Meters Viewing Real-time Harmonic Spectrum
120 PowerSmart+ Power Quality Meter
Figure 7-3: RT Harmonic Monitor – Spectrum Chart
Power Software retrieves harmonic spectrum for V1-V3 and I1-I3
channels. Harmonics can be displayed as a spectrum chart for a selected
channel or in a table. Power Software can also synthesize waveforms
based on the harmonic spectrum to let you view a shape of the voltage
and current waveforms in your network.
Viewing a Spectrum Chart
Click on the button to view a spectrum chart for the selected channel.
To change a channel, click on the window with the right mouse button,
select Channels..., check the channel you want displayed, and then click
OK. Power Software provides voltage, current, active power and reactive
power spectrum charts.
Power Software can give you indication on whether harmonic levels in the
sampled waveforms exceed compliance limits defined by the power quality
standards or local regulations.
To review or change harmonic limits:
1. Click on the spectrum window with the right mouse button and
select Limits….
2. Select a known harmonics standard, or select Custom and specify
your own harmonic limits.
3. Check the Enabled box to visualize harmonic faults on the
spectrum graph and in harmonic tables.
Harmonics that exceed selected compliance levels are colored in red on
the graph and in the tables.