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VFD's and Total Harmonic Distortion. 3

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Chuk1t

Chuk1t

Electrical
Joined
May 19, 2003
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12
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US
I have a client who wants to keep the Total Harmonic Distortion for current less than 5% at the VFD breaker. What is a reasonable value of % current THD that would be expected for a 12 pulse drive? Supply voltage is 480 Volts.

Motor sizes range from 10 to 50 HP
 
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gonso
Sure, an AFE will certainly reduce your THID to very low levels but if you thought a 12-pulse drive was expensive at 10-50Hp, then an AFE will certainly be even more.
 
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