94 Rockwell Automation Publication 1426-UM001J-EN-P - August 2019
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. 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.
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.
See the following Appendices for further information:
• Appendix F
- IEEE 519
• Appendix G
- IEEE 1159
• Appendix H
- EN 50160
• Appendix I
- EN 61000-4-30
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. The M8 model is
an advanced power quality meter that expands upon the M6 with subcycle
transient detection and capture, flicker monitoring, expanded harmonic analysis,
EN 61000-4-30 metering, and EN50160 conformance tracking.
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.
Tab l e 1 2
compares the power quality capabilities of the PowerMonitor 5000
models.
Table 12 - Power Quality Capabilities
Power Quality Attributes 1426-M5 1426-M6 1426-M8 Per phase Average / Total
IEEE Voltage THD % •••••
IEEE Current THD % •••••
IEC Voltage THD % •••••
IEC Current THD % •••••
Crest Factor, Voltage, and Current ••••
To Next Page
Loading...
Need help?
General
