RE: Re: Cascading Transfo

• To: tesla-at-poodle.pupman-dot-com
• Subject: RE: Re: Cascading Transfo
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Mon, 05 May 1997 01:09:57 -0500
• Approved: tesla-at-stic-dot-net

Subject:      RE: Re: Cascading Transfo
       Date:  Mon, 5 May 1997 08:53:09 +1200
       From:  "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization: Wellington Polytechnic, NZ
         To:  tesla-at-pupman-dot-com


Hello Robert,
             You wrote in reply....

>        From:   robert.michaels-at-online.sme-dot-org (Robert Michaels)
> Organization:  Society of Manufacturing Engineers
>          To:   tesla-at-pupman-dot-com
> 
> T>An ideal transformer is a voltage source is it not? Doesn't matter
> T>what it's rated at. If you load it up, you blow fuses.
> 
>         Huh??
> 
>         An "ideal transformer"  (or an un-ideal one for that matter)
>         is a voltage source =and= a current source !
> 
>         Every transformer (that ever there was) transforms voltage
>         =and= current simultaneously.
> 
>         It is no more correct to think of a transformer as a voltage
>         source than it is to think of it as a current source.

OK - it actually depends on the source impedance which in the case of 
the mains is rather low.
    The point I was trying to make is that with such a source, a good 
transformer doesn't exhibit the current limiting properties one 
normally associates with a current source. People use external 
inductance with pole pigs to limit current for just that reason.

Malcolm

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