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Effective April 2012 Product Application …
Effective April 2012 supersedes April 2007 Product Application AP04014001 EHarmonic reduction methodsOverviewThere are several basic methods for reducing harmonic voltage and current distortion from nonlinear distribution loads such as adjustable frequency drives (AFDs). Following is a description of each method, along with each method s advantages and reduction methodsNo method usedAssuming an AFD with a six-diode input bridge, and no line reactor, DC choke, or filter applied, IEEET 519 1992 guidelines may not be met even if the total connected AFD loads are less than 10%. Because many AFDs require a minimum 1 3% input impedance, the AFD requirements may not be met without a line reactor or additional :NThe SVX9000 comes standard with a nominal 3% input impedance, except for the Compact NEMAT Type 1 design in the M3b 1. No Method UsedAdvantages No added cost Easy to package Easy to sell Easy to applyDisadvantages Potentially high levels of harmonic current and voltage distortion AFD is more susceptible to damage caused by line transients AFD impedance requirements may not be metDC chokeThis is simply a series inductance on the DC side of the semiconductor bridge circuit on the front end of the AFD.
Effective April 2012 Product Application AP04014001E Supersedes April 2007 Harmonic reduction methods Overview There are several basic methods for reducing harmonic voltage and current distortion from
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