Voltages are rarely perfectly balanced in three-phase systems. Although small unbalances are not usually a problem, if this unbalance becomes too great then the unbalance can cause problems especially for…
White Papers
Browse our library of power quality technical resources.
435 white papers
Oscillatory Transient Ring Frequency
This white paper provides details on how to estimate ring frequency caused by resonances formed between power corrections capacitors and inductive loads using ProVision. Waveform data captured using PMI's Eagle…
Using Bluetooth with PMI Recorders
This white paper documents the procedure for installing a Bluetooth device and the proper communication settings for wireless PMI Recorders using ProVision software. PMI offers several power quality recorders for…
Voltage Notching in IEEE Std. 519-2014
In this white paper, I cover the new IEEE Std 519-2014 limits for voltage notching, how these limits are calculated, and how to use ProVision to make the notch measurements.…
Updates and Changes Made to the IEEE 519 in the 2014 Release
On August 12th, 2014, the IEEE Standards Association updated their 519 standard for Harmonic control in electrical power systems. One of the first things you will notice about the updated…
Approaching Power Quality Monitoring Site-Work
Power quality (PQ) monitoring provides insightful information that can be used to detect industrial and residential power disturbances, and provide clues for mitigation and problem resolution. Having the proper power…
Understanding PMI Data Record Types – Part 1
The job of any power monitor is to record all interesting data and leave unrecorded the vast majority of boring, unremarkable data. The tricky part for a monitor is deciding…
Photovoltaic Monitoring Setup Recommendations
Photovoltaic (PV) systems generate new power quality and even basic grid stability challenges. The rapid deployment of PV generation requires comprehensive monitoring to help understand and quantify the impacts on…
Advanced Waveform Capture with ProVision
Waveform Capture data is often the most detailed information available in a PQ recording. Getting good data is not always easy, so it's important to glean all information possible from…
Five Methods to Determine the Source of Harmonics
Harmonics are "Non-Linear" current or voltage in an electrical system. Any waveform that deviates from a perfect sine wave has harmonics. Any non-linear load draws harmonic currents and therefore produces…
Power Factor Correction Capacitors and Resonances
This paper explains some of the issues concerning power factor correction, and the side-effect of resonances that can be detrimental to a power distribution system. Also are some solutions to…
Electric Vehicle Charging and Power Quality
Several months ago PMI purchased a Nissan Leaf all-electric vehicle. The Leaf has an approximate range of 90 miles which fits well with our day to day usage for local…
