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Re: PFC, Do you advocate them on 14440 1 amp transformers?

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Jim,
Your PFC should be across the power line (or variac output) with the inductive ballast in series with the PIG LV input both located downstream from the PFC. Since the PFC has a "zero" impedance voltage source across it (the line or variac output), its current draw will only be seen by the source and will not affect things downstream. Since the run caps are rated for the line voltage you are using, there is no need to worry about current rating for these applications.
Capacitive PFC will only help if you are using a LTR value of Cp as the reactance of the LTR value cap reflected to the primary will be smaller than the reactance of the ballast inductance in series with it, and hence the load presented to the line will still look inductive. If STR opearation is contemplated, the load to the line will look capacitive and an inductive PFC will then be needed to cancel this out if desired 

Gerry R..


Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi again,

I am considering buying 1000uf @ 370v Run Caps (100uf ganged) for PFC. I not
to worried about the current, I'll be using a Nema 5 contactor.

Will this effect the performance of the coil. I seem to remember reading
somewhere that they add a kick as well as increase efficiency. Does the
power company see a difference? I also seem to remember that they don't see
inductive loads well.

My source for the transformer is Jack. We all hear from him from time to
time . He has lots of HV toys. I will be using a 15kva sliding choke
actuated by a surplus satellite actuator. Hey, I like the idea of a rocker
switch to control current! I've already leaned my lesson about putting movs
across switches and maybe to ground too.

Jack if you are reading this , please respond with a comment about using a
PFC bank associated with a slide choke, on the bombardier Transformer. The
effect of the capacitance and the varying inductance is interesting.

Comments?