Re: Large Transformer Question (fwd)

To: tesla-at-pupman-dot-com
Subject: Re: Large Transformer Question (fwd)
From: Tesla List <mod1-at-pupman-dot-com>
Date: Fri, 13 Feb 1998 21:14:05 -0700 (MST)
Approved: mod1-at-pupman-dot-com



---------- Forwarded message ----------
Date: Fri, 13 Feb 1998 06:58:00 -0800
From: Bert Hickman <bert.hickman-at-aquila-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Large Transformer Question (fwd)

Tesla List wrote:
> 
> ---------- Forwarded message ----------
> Date: Wed, 11 Feb 1998 21:46:34 -0600
> From: Jeff Corr <corr-at-enid-dot-com>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Large Transformer Question

><SNIP>
> 
> I think your cap value of .01uf is too high...  What is the current output
> of your transformers?  The typical range of cap value should be .01uf
> for every 30ma of current.
> 
> Jeff Corr   |   corr-at-mail.enid-dot-com   |   580-234-6749
> http://www.harvestcomm-dot-net/personal/corr/index.htm
> ICQ UIN # 1303360 | Nick TacoBell

Jeff and all,

Tank cap size is a function of the transformer's output voltage and the
operating frequency. The higher the output voltage, the larger the
current capability needed. A rule of thumb is about 0.01 uF for every 60
mA off a 15 kV transformer. For example, the following table can be used
for approximate sizing:

                    uF       uF 
                  Max -at-     Max -at-
     kV    mA     60 Hz     50 Hz
     ==    ==     =====     ===== 
      9    30     0.008     0.011        
      9    60     0.018     0.021
     12    30     0.007     0.008
     12    60     0.013     0.016
     15    30     0.005     0.006
     15    60     0.011     0.013

The table can be scaled for larger current values as appropriate.

Hope this helps!

-- Bert --