Re: 'Anti-parallel' ?? (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 19 Nov 2004 11:26:05 -0600
From: Bert Hickman <bert.hickman@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: 'Anti-parallel' ?? (fwd)

Hi Carl,

An anti-parallel connection simply means that the primaries are 
electrically connected in parallel, but the input leads of one MOT are 
reversed in polarity (or "sense") versus the other pair so that the 
secondary voltages can add. This connection can be used to double the 
total output voltage from a pair of MOT's without introducing any 
additional stress on the secondary insulation systems. The asterisks 
illustrate the sense of the windings, and the polarity marks reflect 
how the voltages will appear for a given half cycle of AC.

                  IN
               |       |
           |---|-------o
           |   o-------|---|
           |   |       |   |
         * |+ -|       |+ -| *
           ooooo       ooooo
          -------     -------
          -------     -------
          ooooooo     ooooooo
        * |+   -|     |+   -| *
          |     ---o---     |
          |        |        |
          |      -----      |
          |     / / /       |
          |                 |
                 OUT


Best regards,

-- Bert--
-- 
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High Voltage list wrote:
> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Thu, 18 Nov 2004 10:48:12 -0600
> From: Carl Litton <Carl_Litton@xxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: 'Anti-parallel' ??
> 
> 
> 
> 
> I threw this out as part of a larger issue a few days ago and I wanted
> to see if anyone would be willing to hazard a guess as to what the term
> 'anti-parallel' means?  The context is almost always in the wiring of 2
> transformer primaries in parallel in preparation for putting the
> secondaries in series.  
> 
> One very similar passage referred to wiring the primaries of 2 MOT's 'so
> that they oppose one another.'
> 
> The question is:
> 
> Is something different from standard parallel wiring being indicated by
> this term or is it just a local terminology variant (most referenced
> articles had apparent source in the UK)?
> 
> I really cannot see any difference whether the 'black' wire is taken to
> the 'righthand' side of both transformers or not.
> 
> 
> Comments please.
> 
> 
> Carl Litton
> 
> 
> .
>