Harmonic Information
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Harmonic Mitigation at the Device Level, to Help Keep Power Supply Clean - Source: Automation.com
This article is a general overview covering the definition of line current harmonics and how to mitigate devices to reduce heat losses in transformers.See Complete Article: See Complete Article -
Harmonic Mitigation in AC Drives - Source: Control Engineering
This instructional entry discusses the cause of harmonics related overheating in AC drives and how to prevent it from happening.See Complete Article: See Complete ArticlePublished: 09/01/2006 -
Effects of harmonics on power systems - Source: EC&M
Most people don't realize that harmonics have been around a long time. Since the first AC generator went online more than 100 years ago, electrical systems have experienced harmonics. The harmonics at that time were minor and had no detrimental effects.See Complete Article: See Complete ArticlePublished: 10/01/1995 -
Effects of harmonics on power systems. (part 2) - Source: EC&M
Harmonic analyzers are effective instruments for determining the waveshapes of voltage and current and measuring the respective frequency spectrum. Several types of harmonic measuring instruments are available, with each type having a different capability.See Complete Article: See Complete ArticlePublished: 02/01/1996 -
An Undistorted Look at Harmonics - Source: EC&M
This article explains the fundamentals of harmonic distortion including total harmonic distortion (THD) and describes how to minimize it to protect equipment.See Complete Article: See Complete ArticlePublished: 06/01/2000 -
Harmonics Made Simple - Source: EC&M
This article offers a general overview of how harmonics occur and how they can effect crucial equipment as well as how to effectively analyze harmonics.See Complete Article: See Complete ArticlePublished: 01/01/2004 -
Fundamentals Of Harmonics Testing And Mitigation - Source: EC&M
This entry offers a detailed breakdown of harmonics testing and mitigation including voltage and current measurements and how to recognize voltage and current waveform distortion.See Complete Article: See Complete ArticlePublished: 07/01/1999 -
Identifying and Mitigating Harmonics in AC Drive Applications - Source: EC&M
This article explains in detail how to identify and deal with harmonics issues in AC drive applications, which can be very different compared to DC applications. Also offers the "Top 10 Rules For Mitigating Harmonics".See Complete Article: See Complete ArticlePublished: 05/01/2006 -
Fundamentals of Harmonics - Source: EC&M
This general overview of harmonics discusses the definition of harmonics, how they work, problems with harmonics, circuit overloading and triplen harmonics.See Complete Article: See Complete ArticlePublished: 06/01/1999 -
Mitigating Harmonics in Industrial Environments - Source: EC&M
This article explains how harmonics effect equipment in industrial environments as well as increasing effective source impedance, diverting a specific harmonic frequency away from power source, and harmonic cancellation using 12-pulse and 18-pulse convertersSee Complete Article: See Complete ArticlePublished: 06/01/2007 -
Controlling Harmonics Locally in Commercial Facilities - Source: EC&M
The increased use of electronic equipment with switch mode power supplies may be wreaking havoc on 120/208V systems, but you have options for correcting the problem locally.See Complete Article: See Complete ArticlePublished: 08/01/2003 -
Power Factor Correction and Harmonic Resonance: A Volatile Mix - Source: EC&M
This article defines harmonic resonance and parallel resonant frequencies for carious capacitor sizes. Also covered in this article; measurement tips and tips on how to avoid harmonic resonance.See Complete Article: See Complete Article -
Understanding Harmonic Indices - Source: EC&M
This article describes how the power quality industry's index values, or harmonic indices, provide a useful unit of system performance. The two most widely used are total harmonic distortion (THD) and total demand distortion (TDD). These are measurements of the effective value of a waveform and can be applied to both current and voltage.See Complete Article: See Complete ArticlePublished: 04/01/2008 -
Harmonic Limits for Single-Phase Equipment - Source: EC&M
This article dispels popular myths about harmonics and suggests the benefits of the US adopting IEC limits to mitigate harmonics issues.See Complete Article: See Complete ArticlePublished: 12/01/2002 -
Harmonic Current and Voltage Distortion - Source: EC&M
This entry helps power quality consumer understand the causes, similarities, and differences between voltage and current distortion to help identify most power quality problems. Detailed graphs explain how current measurements and voltage measurements independently effect harmonics.See Complete Article: See Complete Article -
Harmonic Distortion: Definitions And Countermeasures - Source: EC&M
Part One of this series on harmonic distortion covers an introduction to the causes of harmonic distortion and how to prevent odd harmonics issues.See Complete Article: See Complete ArticlePublished: 03/01/1998 -
Harmonic Distortion: Definitions And Countermeasures, Part 2 - Source: EC&M
Part Two of this series on harmonic distortion covers how to find the specific frequency of a harmonic and how to estimate the total harmonic distortion (THD) of a waveform as well as how harmonics increase the heating of a power transformer's core.See Complete Article: See Complete ArticlePublished: 05/01/1998 -
Harmonic Distortion: Definitions And Countermeasures—Part 3 - Source: EC&M
The third and final part of this series about harmonic distortion discusses specific countermeasures to prevent harmonic distortion.See Complete Article: See Complete ArticlePublished: 07/01/1998 -
Simplifying Harmonic Mitigation for Industrial Plants - Source: EC&M
Variable frequency drives (VFDs) are uniformly present in modern industrial plants. Their presence is the result of increased awareness of the environmental effect of high power consumption and the need to reduce the cost of energy. More...See Complete Article: See Complete ArticlePublished: 01/01/2005 -
Meeting IEEE's 519-1992 Harmonic Limits - Source: EC&M
This article describes the most effective way to meet harmonic distortion limits by filtering the harmonics at individual load and measuring them at the point of common coupling.See Complete Article: See Complete Article -
The How's and Why's of Harmonic Distortion - Source: EC&M
This article offers definitions of linear loads, current waveforms, inductances, capacitances, nonlinear loads and voltage wave form distortion and how all of these are factors in harmonic distortion.See Complete Article: See Complete ArticlePublished: 06/01/2006 -
Harmonic Distortion And Board Layout - Source: Electronic Design
This article explains the effects of harmonic distortion in relation to PCBs and how board layout is crucial in getting the most from a quality amplifier.See Complete Article: See Complete ArticlePublished: 12/18/2007 -
For the Sake of Unity: Implementing New Regulations for Harmonic Current Emissions - Source: ECNmag.com
Most switch-mode AC/DC power supplies tend to draw current from their power source in a non-sinusoidal fashion. Left uncorrected, this input current characteristic would result in current, and possibly also voltage, distortions on the supply line, degrading the quality of the supply and causing interference issues with other equipment on the same supply line. Furthermore, as the phase difference between the input voltage and current waveforms increases; i.e., as the power factor moves away from unity (1.00), higher input current is required.See Complete Article: See Complete ArticlePublished: 02/01/2007 -
Simple Scheme Lowers Harmonic Distortion Of Transformers - Source: Electronic Design
This article describes how to achieve a 10-dB reduction in harmonic distortion using three transformers to regulate voltage. This method can be extended to more than three transformers, or reduced to two transformers as well.See Complete Article: See Complete ArticlePublished: 11/24/2003 -
Harmonic Mitigation - Source: Energy Management Corporation
This article talks about Harmonic Mitigation specifications for a variable frequency drive. Topics include background, Recommended Practices for Harmonic Control, Effects of Harmonics, Harmonic Mitigation Cost, Measurement Considerations and Recommendations.See Complete Article: See Complete Article
