Re: Calculation of tank cap

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Herwig Roscher by way of Terry Fritz <twftesla-at-qwest-dot-net>" <herwig.roscher-at-gmx.de>


Barton B. Anderson wrote:
> I'd say math was right and method was wrong 

Barton,

So I had a partial success at least  ;-)

> Have you ran your math with a typical transformer?
- One of my larger MOTs takes 0.4 A without load at 230 V / 50 
Hz. In order not to confuse anybody, I scaled it to 120 V = doubled 
the current for the example (not really correct).

> How about my pole pig: 
> Open load current of primary winding = 0.25 A 
- That's really small!

> Hold on to your seat, 
> Add 50 % for LTR-cap: = 1.15 nF 
- Amazingly small and obviously wrong for a pole pig!

> Cres should be near to 128nF.
- Calculated or found from tests?

> I'd say your better off sticking with Terry's formula of 0.83 x Io / 
(BPS x Vo). 
- A clear word - thank you!
 
Take care, 

Herwig