Re: [TCML] JavaTC PF cap calculation XL,XC,Z

[David Dean <deano@xxxxxxxxxxxxxxxx>]

Hi

On Sunday 07 December 2008 07:49:13 pm Jim Mora wrote:
> Hello List,
>
>
>
> I asked a similar question of JavaTC before but should the PF capacitance
> be calculated with the transformer top KVA and top voltage rating
> regardless of ballast inductance and over- volting  and over currenting or
> will it be a variable?

It will be a variable. If you are using a polemount distribution transformer or 
a potential transformer, the transformer itself has little to do with PFC. The 
turns ratio is the most important parameter, the internal resistance and 
inductance will be rather insignificant and can be ignored. The relationship 
between the reflected impedance of the ballast and the tank cap are what you 
need to look at.

See my page at:
http://deanostoybox.com/pfc.html

for a little bit about how it works. You could probably get close to the correct 
PFC value by calculation if you are going to have a constant breakrate. If the 
breakrate varies, however, the PFC value will change with the breakrate. If the 
ballast is variable, the PFC value will change with the ballast. 

Unfortunately, I do not know of any method to know for sure what PFC value, if 
any, will be optimal for any particular setup except for trial and error.

> I'm on the edge of my power source delivery and 
> would like to get an accurate PF correction value. The transformer does not
> spec its impedance. It seems to me the ballast impedance would affect the
> value and the capacitance would likewise affect the ballast phasing.
>
>
>
> Thanks,
>
> Jim Mora
>
later
deano


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