[TCML] Ballasting my Homemade Transformer.

["Phil Tuck" <follies@xxxxxxxxxxxx>]

Hello.

I have finally got my homemade transformer running and now face the
delightful task of ballasting it. Its output, based on scaling up low
voltage readings, will be 10 to 11K (3.7kva approx)  limited by the number
of turns and the window winding size unfortunately. Primary will be set up
for 16 amps with around 375 m/a secondary (235v / 240v system). (Primary =
Bifilar AWG 14, Secondary = AWG 27)

 

 

Two quick questions:

Question 1:

As a perfect theoretical ballast will have no resistance, is it true to say
that when using an inductive ballast for my transformer, the only voltage
drop across the ballast will be caused by the ballast's resistive component
? 

In other words if I wind an inductive ballast coil of the correct mH rating
(using chunky wire on a 4 square inch core so it has low ohm resistance) I
should get almost full voltage going into the tranny, with little voltage
drop across the inductive ballast?

 

Question 2:

There are various inductance calculators around, but they are all for
air-cored as far as I can see. Anyone know a link to one that caters for a
laminated core. It will still be a bit of a guess as I don't know the cores
magnetic specifications, but it will be better than using an air cored
example. I am trying to avoid the hit and miss method of wind / measure /
wind / measure etc, as I will be winding onto a bobbin using a lathe.

 

 

Regards

 

Phil

www.follytowers.co.uk/tesla

 

     

 

 

 

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