Learning Center

VFDs and Harmonics – Why You Should Care

By Tyler Simmons on 11th Mar 2021

What Problems Can Come With VFDs?Most people that buy and use a variable frequency drive (VFD) are aware of the benefits they offer, such as speed control over their motor application or energy savings. What most people don’t know …

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Active Harmonic Filters - Noise-Canceling Headphones for Your Power System

By Jeff Noxon on 8th Aug 2020

AHFs are inActive harmonic filters (AHFs) have gained a lot of traction in the last couple of years. In the past, high costs meant that active harmonic mitigation methods were reserved for extremely large/complex applications with …

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Case Study: Solving Motor Inrush Current and Energy Savings with VFDs

By Craig Hartman on 20th Mar 2015

Tensions resolved between utility company and local community by replacing soft start with VFD to correct voltage sags due to medium voltage compressor startsA large land fill energy producer in Chicago faced a  …

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How Will Line Reactors Help Your Variable Frequency Drive?

By Yin on 23rd Jun 2014

The problem:While VFD's provide great advantages in energy savings and increased efficiency, they are the #1 cause of electrical power system pollution. Reactors have become the most common means of reducing this pollution (or dir …

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What is a Line Reactor?

By Yin on 12th Jun 2014

A line reactor (also referred to as a "choke") is a variable frequency drive (VFD) accessory that consists of a coil of wire that forms a magnetic field as current flows through it. This magnetic field limits the rate of rise of t …

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Variable Frequency Drive Harmonic Mitigation

By Craig Hartman on 20th Mar 2014

Table of Contents Background of Harmonics IEEE 519 - Recommended Practices for Harmonic Control Effects of Harmonics Types of Harmonic Mitigation Equipment Harmonic Mitigation Cost Measurement Considerations Re …

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