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The screen updates with each new average calculation interval of
10 minutes.
From the PQ Health Home screen you have access to:
•
PQ Graphs
•
Harmonics
•
Events
Quality Overview
The Quality Overview screen shows an average of voltage THD and
the first 25 voltage harmonics of up to three phases and the number of
voltage events. The screen updates with each new average
calculation interval of 10 minutes.
PQ Graphs
Use
(PQ Graphs) to review the graphs of the power quality
parameters: Voltage, Frequency, and Supply Voltage Unbalance. The
Voltage and Unbalance values are averaged every 10 minutes and
the interval begins with the 10-minute clock tick. The time stamp of the
interval represents the end of the interval. The frequency is averaged
over an interval of 10 seconds. New values are available every
10 minutes.
The unbalance value u2 (negative sequence ratio) is the ratio of
negative sequence divided by positive sequence and is shown as a
percentage.
In the case of a counter-clockwise rotating system, the unbalance
would show values exceeding 100 %. In this case the ratio positive
sequence divided by negative system is calculated which results in
values lower or equal to 100 %.
The unbalance is only available in three phase delta and Wye
systems, excluding the balanced systems.
Harmonics
Use
(Harmonics) to access the harmonics analysis screens for
voltage and current.
Harmonics Spectrum
The harmonics spectrum is a bar chart of the harmonics h02 ... h50.
When % of the fundamental is selected, THD is included in the chart.
The bar chart in absolute units (V RMS, A RMS) includes the
fundamental. Use the trend chart to show the exact value.
Trend Chart
The trend chart is a chart of the fundamental, a selectable harmonic,
or THD. A split screen shows the harmonics spectrum in the upper
graph and the trend chart in the lower graph. Touch the bar chart or
use
and
to select the parameter of interest. Press
(Trend only) to expand the trend chart to full screen.
Power Logger
Function Selection Buttons
Note
41
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