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…
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Using PMI’s TLAR and TLAR-S Clamp-Style Current Transformers
Clamp-Style Current Transformers (CTs) are a convenient and safe way to measure current flowing through a conductor. PMI offers the TLAR line of iron core CT clamps in both the…
Power Factor Correction and Voltage Regulation
Maintaining acceptable voltage levels along distribution feeders requires careful coordination of voltage regulation equipment and proactive management of reactive power and harmonics. Loads with significant inductive characteristics increase reactive power…
Defining and Measuring Rapid Voltage Change
Rapid Voltage Change (RVC) represents a specific category of power quality phenomena characterized by a fast transition in the RMS voltage between two steady-state conditions. Unlike a voltage dip or…
Voltage Tug-of-War The Silent VFD Killer
The modern variable-speed drive (VFD) is a sophisticated power electronic system, yet the front end is still a deceptively simple six-pulse diode bridge. That simplicity means the rectifier has little…
High Impedance Faults: Causes, Risks, Detection Techniques
High impedance faults can be a troublesome power quality issue affecting not only utilities, but their customers too. Frequently, these faults can trip arc fault breakers and GFCI outlets and…
PQ Trends Electric Vehicle Charging
The rapid deployment of electric vehicle (EV) charging infrastructure is reshaping electric distribution systems in North America. This white paper provides a focused technical overview of EV charging technologies, emphasizing…
Smarter PQ Search with AI
This paper introduces an enhancement to PQCanvass: natural language document retrieval powered by vector embedding technology. This feature enables engineers to search Power Monitors Inc.’s white paper library using conceptual…
PMI View Feature Updates and Enhancements
Introduction PMI View for iOS continues to evolve with new features and improvements since our last white paper. This document highlights the significant additions that enhance your ability to perform…
60Hz Phasors and Extended PQ Measurements
This white paper walks the reader through a method to take basic core PQ measurements and derive several other measurements (such as 60Hz power, Voltage and Current THD, distortion power…
Variable Frequency Drives and Harmonics
Abstract A VFD, or Variable Frequency Drive, is a device which takes in a 3 phase AC signal and outputs a somewhat arbitrary waveform using pulse width modulation. This is…
Best Practices for Photovoltaic Monitoring Setup
The increasing development and use of solar power generation using Photovoltaic (PV) systems introduces new power quality perspectives and challenges. Understanding common analytic avenues with regard to PV systems can…