Rockwell Automation 1426 PowerMonitor 5000 Unit User Manual
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Rockwell Automation Publication 1426-UM001F-EN-P - November 2013
Chapter 5
Power Quality Monitoring
The term ‘power quality’ is associated with electromagnetic irregularities in
voltage and current in a power circuit that can interfere with or cause failures of
electronic equipment. A number of national and international standards have
been developed that define and classify power quality events and issues, and
provide guidelines for detecting and reporting these events and issues. The design
of the power quality functions in the PowerMonitor 5000 unit has been aligned
with these standards. The purpose of these functions is to assist users to
determine and correct the causes of poor power quality, resulting in more reliable
operation and reduced cost.
Power quality functions are classified into three broad categories:
•
Measurement and reporting the value of power circuit attributes that
comprise power quality
•
Classification of power quality events according to applicable standards
and annunciation of such events
•
Recording power quality events and their metadata for statistical and
diagnostic purposes
The PowerMonitor 5000 unit provides a range of power quality monitoring
functions. The basic M5 model detects sags and swells, and measures THD, crest
factor, and K-factor. The M6 model builds upon the M5 functionality, adding
IEEE-519 THD/TDD pass/fail reporting, user configurable voltage sag/swell
settings, power quality logging, waveform recording, harmonic analysis, and
synchronized event recording among multiple power monitors.
FactoryTalk EnergyMetrix software and its RealTime (RT) option provide
comprehensive, web-based software tools for presenting the power quality
monitoring data produced by the PowerMonitor 5000 M6 model.
compares the power quality capabilities of the M5 and M6 models.
Table 12 - Power Quality Capabilities
Power Quality Attributes
1426-M5
1426-M6
Per phase
Average / Total
IEEE Voltage THD %
•
•
•
•
IEEE Current THD %
•
•
•
•
IEC Voltage THD %
•
•
•
•
IEC Current THD %
•
•
•
•
Crest Factor, Voltage and Current
•
•
•
K-factor, Current
•
•
•
Harmonic voltages DC … 63rd, magnitude and angle
•
•
Harmonic currents DC … 63rd,, magnitude and angle
•
•
Harmonic kW, kVAR, kVA, DC … 63rd, total and per-phase
•
•
•
Sag and swell detection
•
•
•
•
Classification of Power Quality Events Per IEEE 1159
•
•
•
IEEE 519 pass/fail and TDD % (2nd through 40th)
•
•
•
•
Waveform recording
•
•
•
Network synchronized waveform recording
•
Power quality logging
•