http://disqus.com/by/paulrock16/enTue, 29 Sep 2009 14:30:54 -0000http://ecmweb.com/power_quality/pf-correction-single-induction-motors-20090601/#comment-17787650<p>The following statement is not entirely accurate: "Finally, using the data in Table 2, select a capacitor, rounding down to the next lower value. You now have the correct size capacitor for your PF correction plan". A better option would be to go up the next size (As dictated by a billing/load study and common sense). For all we know, end-users are more likely to add more inductive loads at a facility rather than removing loads. Rounding down to the next value will get the end-users close to the desired power factor, but may not be close enough to the "Safe zone" where the utility would stop penalizing the end-users. Another advantage to rounding up, is the availability of already, on-site kVAR should end-users decide to expand motor loads. When adding capacitors to a facility, it is recommended that end-users performs a load forecast or expansion study to estimate the future kW &amp; kVAR requirements.</p>paulrock16Tue, 29 Sep 2009 14:30:54 -0000http://ecmweb.com/power_quality/pf-correction-single-induction-motors-20090601/#comment-17775824<p>Kermit,<br><br>Manufacturers do not add sized capacitors to motors, because it add costs to the motor's price (By adding a capacitor bank, a disconnect, wires, etc.). However, this option may be requested. From a cost perspective, it is more economical to add a larger, sized bank upstream of all inductive loads instead of having multiple, small individual banks on motors. Also, it is easier to troubleshoot (i.e. harmonics, overheating/ventilation, improper wiring, etc.) one bank versus multiple small capacitors banks. I hope this answers your question.</p>paulrock16Tue, 29 Sep 2009 11:20:40 -0000