AcquiSuite Ally 12 & 48 User Guide (Rev D)
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P a g e
Power Factor Convention
Power Factor is the ratio of a signed number (true power) and an unsigned number (apparent power).
This discrepancy has led to some customer confusiuon. The AcquiSuite Ally meter allows users to select
between two conventions (ANSI & IEEE). In the IEEE convention the sign of PF follows the sign of power
itself. In the ANSI convention a “+” PF indicates a lagging current (inductive load) while a “–“ PF indicates
a leading current (capacitive load). The sign relationships are shown below for these conventions in each
electrical quadrant.
Total Harmonic Distortion
The AcquiSuite
Ally meter reports overall harmonic content in power (% THD) based on it’s measurement
of Power, Var and Apparent Power as illustrated in the figure below. This method cannot indicate the
harmonic number or distribution but provides the overall harmonic content.
In many circumstances users are interested in the harmonic content of
current
. In cases where the voltage
is very sinusoidial the THD measurement is a good estimate of both power and current. However, if the
voltage waveform is distorted the reported THD in power can be misleading. Obvius Ally Configuration
Console can provide additional analysis of harmonic content in voltage and current by sampling the
AcquiSuite Ally raw data and performing digital signal processing on the signal. Using this method the
individual harmonics levels can be observed. The results are presented in graphical form.
Содержание AcquiSuite Ally
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Страница 57: ...AcquiSuite Ally 12 48 User Guide Rev D 57 P a g e COMMUNICATION NAVIGATION ...
Страница 58: ...AcquiSuite Ally 12 48 User Guide Rev D 58 P a g e APPENDIX B ENCLOSURE DIMENSIONS Enclosure Dimensions ...
Страница 59: ...AcquiSuite Ally 12 48 User Guide Rev D 59 P a g e APPENDIX C MOUNTING TEMPLATES Enclosure Drill Template ...
Страница 60: ...AcquiSuite Ally 12 48 User Guide Rev D 60 P a g e AMC48 Mounting Plate Template AMC12 Mounting Plate Template ...
