Megger MPQSIM, Руководство пользователя

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M
AVTMMPQSIM Rev 1 May 2017
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27. Create a PQ Timed Waveform Analysis
Click on CREATE CHART/PQ TIMED WAVEFORM ANALYSIS.
This chart allows you to analyze all the timed waveforms that were recorded. The
MPQ unit can take waveform snap shots throughout the test interval. This screen
allows you to analyze that data.
This screen will average together each cycle of each individual waveform capture then
perform an FFT on that averaged cycle. It will then plot the individual harmonics
orders of the waveform captures.
A scan line can then be moved back and forth through the chart. The actual
waveform for that interval can be viewed. In addition a harmonic bar chart of that
waveform can be viewed.
This is different from IEC Harmonic recording. The IEC Harmonic recording is a
continuous value that is aggregated over a periodic interval, typically 10 minutes.
The PQ timed waveform analysis chart shows the FFT analysis of the waveform
snapshots. So this data may not match the IEC Harmonic data, since it is not
aggregated over a periodic interval.