Re: Transformer (2500 volt)

• To: tesla-at-poodle.pupman-dot-com
• Subject: Re: Transformer (2500 volt)
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Wed, 14 May 1997 00:37:38 -0500
• Approved: tesla-at-stic-dot-net

Subject:      Re: Transformer (2500 volt)
       Date:  Wed, 14 May 1997 09:40:36 +1200
       From:  "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization:  Wellington Polytechnic, NZ
         To:   tesla-at-pupman-dot-com


Hi Dave,

> Question, do you really need to add current limiting if you use a
> uwave transformer? I had my waste management friend get me 4 old
> uwaves, all different but similar. Each transformer has shunts,
> aren't they enough to limit the current?
> BTW the xformers look like new, after the dusts is removed, and if
> placed under oil should be quite rugged.
> Dave Huffman

Well microwave ovens don't need external current limiting. You might 
get away with two transformers in parallel but I measured the peak 
primary currents are in excess of 30A with a poor power factor (230V 
mains). The shunts limit the amount of pri-sec coupling. A short on 
the secondary causes most of the core flux to work its way through 
the shunt.

Malcolm

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