Understanding why current and voltage deviate from a pure sinewave, how it affects electrical systems, and best practices for dealing with the non-linear loads that cause them


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Utility Transformer


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Electrical Troubleshooting Quiz — Aug. 3, 2021

Aug. 3, 2021
How to address a scary power quality report
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Ups For March 2021 Monthly Quiz

ECM’s Monthly Quiz: Power Quality Puzzles

March 2, 2021
Take this quiz to see how much you know about power quality, and enter for a chance to win a $25 gift card to Amazon, Cabela's, or iTunes!
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Check That UPS

Oct. 13, 2020
These systems store energy, typically in a battery, and then release that energy when needed.
Harmonic Thd Graph

Where Is That Harmonic Source?

Sept. 22, 2020
Electrical current can point to a device that’s causing problems on a power system, but this isn’t always the case when there’s a harmonics issue.
Follow The Current Pq Newsbeat

Follow the Current

Sept. 8, 2020
Unless you have a harmonic issue, the electrical current usually leads the investigation to the source of the problem.
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Frustrated Engineer
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Quiz On Wooden Blocks

Electrical Troubleshooting Quiz — July 7, 2020

July 7, 2020
What to do when a custom-built production machine with recycled parts keeps breaking down
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Delinquent ASD Causes Havoc on PV System

May 26, 2020
Unusual fault code leads to the true culprit of a power quality dilemma
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How Are Your Harmonics?

Nov. 7, 2016
A good harmonic analyzer will show you graphically the breakdown of your component harmonics.
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How to Reduce Energy Waste Before You Spend Money on an Audit

March 3, 2016
You don't have to wait for an audit to identify ways to cut energy costs