34
The total harmonic distortion (THD) of voltages is displayed using the THD function, discussed later in
this chapter.
Voltage Measurements in PSM
The consumption data log can record maximum, minimum, and average RMS voltage for each phase
for each logging period. The summary values at the top of the screen are the maximum, minimum, and
average of all the values shown on the screen.
When viewing consumption waveforms, the average RMS of the cycles of the waveform is shown at the
top, with the average crest factor listed below it. The instantaneous value of each point of the
waveform can be determined using the vertical scale. If a harmonic analysis is displayed, the RMS
voltage is also listed
When viewing voltage swell logs, the highest ½ cycle RMS level of each event is displayed. An event
starts when the trigger is exceeded and ends either when 10 cycles have passed or when a ½ cycle
does not exceed the trigger level (whichever is longer). Voltage dip logs display the lowest ½ cycle
RMS level of each event. Each event starts with the trigger and ends in 10 cycles or when a ½ cycle
does not fall below the trigger level (whichever is longer).
When viewing swell/sag RMS graphs, the RMS of each ½ cycle is graphed and the most extreme
measurement, with its timestamp, is presented at the top.
When viewing transient waveforms, the instantaneous values of the voltage are graphed, as with
consumption waveforms. But the summary value at the top is the Vpk value above the trigger, with its
timestamp.
If trending data is being recorded and ATPOL II is operating in phase-neutral voltage measurement
mode, the average V
1N
, V
2N
, and V
3N
voltages for each second will be displayed and recorded each
second. If in phase-phase voltage measurement mode, the average V
12
, V
23
, and V
31
voltages for
each second will be displayed and recorded each second.
The measurements of voltage presented on ATPOL II can also be displayed in PSM by using the
remote control feature.
In addition our Report Generator software will present maximum, minimum, and average voltage of
each phase during any one or two intervals of time set by the user. If two time intervals are chosen, it
will report the percent change and the actual change between the two intervals. For instance, if a
comparison report is chosen and V
12
average is 480 V during the first interval and 478 V during the
second interval, then the report would show:
Before After Units Change
%
Change
Voltage, Phase 1, Avg.
480
478
volts
-2.0
-0.4%
The total harmonic distortion (THD) of voltages is displayed using the THD function, discussed later in
this chapter.
Summary of Contents for ATPOL II
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