Antiparallel Explained

To: tesla-at-poodle.pupman-dot-com
Subject: Antiparallel Explained
From: Tesla List <tesla-at-stic-dot-net>
Date: Thu, 27 Mar 1997 09:09:35 -0600
Approved: tesla-at-stic-dot-net
Subject: 
        Antiparallel Explained
  Date: 
        Thu, 27 Mar 1997 07:17:47 -0500
  From: 
        "Thomas McGahee" <tom_mcgahee-at-sigmais-dot-com>
    To: 
        "Tesla List" <tesla-at-pupman-dot-com>



----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-poodle.pupman-dot-com
> Subject: Re: H&R transformers by the numbers
> Date: Wednesday, March 26, 1997 1:49 PM
> 
> Subject: 
>         Re: H&R transformers by the numbers
>   Date: 
>         Wed, 26 Mar 1997 11:28:58 -0500
>   From: 
>         "Lord Talimar" <lordtali-at-mill.tds-dot-net>
>     To: 
>         "Tesla List" <tesla-at-pupman-dot-com>
> 
> 
> Antiparallel?
> 

Antiparallel is the opposite of true (phased) parallel. I hope the
following explanation which I lifted from one of my posts to Max will
help
illustrate the concept. 

> Once you have determined the  wiring of each transformer, you need to
wire
> them together in an anti-parallel arrangement. That is just a fancy term
> for winding the transformer primaries in such a way that they are
paralled,
> but the phasing is reversed. That allows us to wire the secondaries in a
> special series arrangement in which the outer HV leads produce opposite
> polarities at any given instant. One reason for doing that is that it
> allows us to ground the center tapped secondaries to the core and to AC
> ground so that the electrical stresses on the transformer are reduced. It
> is important that it is the *INNER* HV leads that get tied together and
> connected to ground!
> 
> Some stupid ASCII drawings:
> 
> A1----p s----C1
>       p s
>       p s
>       p s
> B1----p s----D1
> 
> A2----p s----C2
>       p s
>       p s
>       p s
> B2----p s----D2
> 
> Assume:
> (p) is primary
> (s) is secondary
> A/B are primary wires
> C/D are secondary wires
> D1 and D2 are the inner HV
> C1 and C2 are the outer HV
> 
> Wire the primary wires together as follows:
> First AC input wire goes to A1 and B2.
> Second AC input wire goes to B1 and A2.
> That puts the primary in anti-parallel.
> 
> Wire the secondary wires as follows:
> D1 connects to D2.
> (That connects the inner HV wires together).
> Ground the connection just made to the core.
> Ground the core to the AC ground (Green wire on line cord).
> (You MUST use a three wire line cord).
> 
> The C1 and C2 wires are now the HV output wires.
> 

This technique can be used any time you are trying to use two HV
transformers that are not Center Tap Grounded. For example, this method
works quite well with Microwave Transformers which already have one wire
connected to the core. Make sure the cores of both transformers are then
connected together and connected to AC Ground.

Fr. Tom McGahee