The first electric traffic signals were installed over 100 years ago but now are a ubiquitous aspect of modern life. Today's intersections are far more complex, with a cabinet of…
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TDD and IEEE 519:2014
IEEE standard 519 was first released in 1982 and was then updated in 1992 and 2014. It defines limits on Total Harmonic Distortion (THD) as well as Total Demand Distortion…
Measuring and Analyzing Voltage Regulation
Voltage Regulation Basics Utilities are generally required to ensure the delivered steady-state voltage is within the limits specified in ANSI C84.1. Persistent under- or over-voltage can result in customer complaints…
An Overview of IEEE 1250 – Guide for Identifying and Improving Voltage Quality in Power Systems
The IEEE 1250 standard was developed in response to the introduction of modern electronics onto an older electrical grid. These newer electronics were not necessarily built to withstand the traditional…
Live PQ Waveforms in a Web Browser
PQ Canvass is the next generation of online power quality analysis tools provided by PMI. This new cloud service offers enhanced graphing, a full suite of PQ analysis tools, recording-based…
CBEMA-ITIC Analysis with Stripcharts
The ITIC curve (formerly CBEMA) is a performance-oriented standard for electronic equipment manufacturers. The standard gives a method for classifying and plotting voltage events on a specially constructed graph that…
Key Issues with DG/DER Monitoring
The dramatic increase in distributed generation (DG), distributed energy resources (DER), and net metering scenarios brings sweeping, unplanned changes to the grid model. Local generation is often unpredictable, and sudden…
PQ Recording Templates
This whitepaper describes the use and customization of PQ recording templates in PQ Canvass, iPowerPad, and in the ProVision software. PMI recording devices can be initialized with many different configurable…
Wireless Power Quality
The time and cost of deploying PQ instrumentation only to return later in order to retrieve it (without the guarantee that the PQ anomaly has occurred) is often times exorbitant.…
Quantifying Residential Voltage Sags
Voltage sag complaints are one of the most common in residential applications. Despite complaints, many residential voltage sags are not actually troublesome, or caused by the utility. Quantifying sag events…
Power Quality Recorder Setup Basics (Part 2)
This whitepaper is a continuation of WP241 (Recorder Setup Basics). In part one the details and relative memory consumption of interval recording was discussed along with the associated controls for…
IEEE 519 Harmonics in Residential Locations
IEEE 519 specifies the measurement technique and limits for harmonics in a wide variety of locations, from transmission through distribution. For the first time, the 2014 edition also provides separate…