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(Barry Vs. Fr.Tom) Differing advice on cap. rating.




From: 	Joshua Resnick[SMTP:seraphim-at-WPI.EDU]
Sent: 	Sunday, November 23, 1997 2:55 PM
To: 	Tesla List
Subject: 	(Barry Vs. Fr.Tom) Differing advice on cap. rating. 


Barry, Fr.Tom, All,

I recently asked fellow coilers what sized caps they used with two H&R
transformers in series.
My calculations say .079uf and so does Fr. Tom. yet you (Barry) used .04
uf rated at 30 kV DC
for the task.
I realize the coil will work at lower ratings but which value is more
desirable, one that draws the most
possible current from the transformer or one of lower rating?
Also 30 kV DC means half that rating AC, so isn't that really pushing
the caps. voltage rating?
Have you ever had one of these cap blow?

In addition, how much does one .01uf -at- 30 kV DC cost from CSI?

Thanks for the advice from both of you,  I just want to get the biggest
bang for my buck.
(and that's what all this is about anyway, right?)

> Primary cap value=.04
> Peak primary cap voltage=14kv (2 5kv photocopier transformers in
> series x
> 1.414)
> Breaks per sec=14 X 1750 / 60 = 408
> Output length to grounded rod=56""
>
> Cap rating-----I use four ( 0.04uF) 30 kV DC rated capacitors
>                        from CSI that are spec.d for 300 kHz
> operationin
>                              induction heater service (polypropylene
>                              with extended foil construction, 0.01 uF
>                              each unit).

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