Hi,

Since your load is mainly DOL with frequent switching, it is best you invest in PF management at the bus level. For each switch board you may install PF correction with switched stages to allow for optimal PF management. This is on the assumotion that your site is fairly large.

If the site is not fairly large then you may use PF correction panel at the main switchboard with CTs installed at the mian feeder , thus providing global compensation.

You can not install a dedicated capacitor for SS driven load , hence it will be more reasonable to use either options above.

You may contact the nearest Schneider Electric branch in your city and they will be abel to help size and supply an optimal solution to your site.

cheers

Aside from being a blantant advertisement, this is actually a very poor recommendation. Bulk power factor correction is the worst approach, not the best. it is responsible for many many field failures of equipment, especially anything with electronic power devices such as VFDs and Solid State Starters or heating Controllers.

Hi,

Bulk PFC was never my intention since i mentoined switched stages using a PFC controller. PFC controllers can measure PF changes then determine the size of the step required. Zig-Zag controllers operate with dead band allowing them to obsorb rapid changes in reactive energy when an induction motor is energized. This is a standard product which has been available for long time and can be purchased from any supplier. Since the loads are mainly DOL type ,thus THDV% &THDI% will not have any adverse effect on the capacitors. The fact VFDs are not present on site then standard PFC equipemnt shall be used.

Hope this will clear any confusion.