Ferroresonance is a nonlinear electrical phenomenon that can damage transformers, surge arresters, cable insulation, and switchgear — and create dangerous backfeed voltages on conductors that should be de-energized. Although relatively…
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Power Quality
Grid Readiness for Data Centers
Global cumulative investment in data centers between 2026 and 2030 is projected to reach $3 trillion. This explosive growth is straining electric grids worldwide. This white paper summarizes the IEEE…
Recognizing Transformer Energization in Power Quality Data
Transformer energization events occur frequently in electrical distribution systems and often appear in power quality recordings. These events can produce large transient currents and waveform distortions that may initially resemble…
Power Theory in Multiphase Distorted Systems
Introduction “Geometric Foundations of Power Theory for Multiphase AC systems in the Frequency Domain” is a great research article written by Francisco Montoya and others and it clearly explains a…
Datacenter Power IV
High-speed protective devices in modern datacenters, such as low-voltage circuit breakers with electronic trip units (ETUs) offering instantaneous or short-time protection, are documented to operate in cases where standard Power…
Power Quality for the Non-PQ Professional
This paper provides a plain-language overview of power quality — what it is, why it matters, and what can be done to maintain it. It is written for professionals outside…
Even vs. Odd Harmonics
Engineered Asymmetry Audiophiles routinely spend thousands of dollars on vintage vacuum tube amplifiers to deliberately inject their music with what power engineers spend millions trying to eliminate: harmonic distortion. Vacuum…
Merlin™ Chat in PQ Canvass
Merlin™ Chat is a conversational AI interface within PQ Canvass that allows engineers to ask natural-language questions about a power quality recording and receive detailed, technically grounded answers. Built on…
Modern Flicker Analysis Using PQ Canvass and Merlin™
Voltage flicker is one of the most common power quality complaints reported by utility customers. The term flicker refers to visible changes in lighting intensity caused by rapid fluctuations in…
Automated Stripchart Analysis With Merlin™
In power quality investigations, triggered waveforms often claim the spotlight, but it is the stripchart that tells the story of the entire recording. Reviewing this data manually is tedious, error-prone,…
Power Quality Challenges of Bidirectional EV Charging
The increasing adoption of Vehicle-to-Grid (V2G) technology enables electric vehicles to operate as mobile inverter-based energy resources, fundamentally altering their interaction with distribution networks. While the power quality impacts of…
Event Capture and Analysis with Merlin™
This white paper provides an overview of the Event Capture function available with PMI power quality analyzers and introduces the Event Change Report, generated by Merlin™, PMI's AI-powered analysis assistant.…
