This paper covers what a variable frequency drive (VFD) is, the different types of VFDs, their functions, and their benefits. Also covered are issues related to VFDs, some solutions to…
White Papers
Browse our library of power quality technical resources.
450 white papers
Seven Common Utility Distribution Challenges: How the Boomerang and Canvass Can Help
Here's our quick list of 7 common utility distribution challenges. These shouldn't come as a surprise to anyone in the industry as utility companies are experiencing more challenges than ever.…
Sampling Rate in PQ Recorders
A common specification in power quality recorders such as PMI's Revolution, Guardian, or Eagle products is the sampling rate of the device. Users know this is an important number and…
Automatic Update Manager
When software products were first created, it was common to only release a final version, simply due to the overhead of distributing the products via physical medium. However, with the…
Using Current Clamps
Measuring the current of residential, commercial or industrial applications is vital to get a complete power quality picture. This white paper covers various topics to effectively utilize the different types…
Advanced Daily Profile Analysis with Canvass
The Daily Profiles graph is likely one of the most underutilized Canvass graphing features. This particular graph is great for identifying long term (and even short term) trends, many of…
Flicker Investigation Strategy
Flicker is defined as fluctuation or wavering in visible light intensity due to voltage variations. These variations in voltage are caused by fluctuations in the load through the system source…
Understanding Total Harmonic Distortion
This paper discusses the causes of Total Harmonic Distortion, how it is calculated, measured, and how it can impact a power distribution system.
End-to-End Boomerang Cybersecurity
Power Monitors Inc.'s Boomerang voltage/current/power sensor, and Canvass, the web-based power quality analysis application is a system for gathering and analyzing data, especially over long periods of time. This long-term…
Steady State vs. Transient Harmonics
A harmonic analysis is a powerful method for analyzing waveform distortion, given the periodic nature of most nonlinear loads. Steady-state harmonic tools are sometimes extended for use with waveform events…
Four-Wire Delta Voltage Unbalance
Voltage unbalance in a four-wire or "high leg" delta can be tricky to measure. A 4-wire delta often involves unbalanced impedances, and phase shifts in the hot leg are common.…
Capturing Oscillatory Transients
Oscillatory transients are caused by switching operations, nearby lightning strikes, or other impulsive noise exciting electrical resonances present on the network. The most common in the distribution system is defined…