Re: 280 Variac + 4 Pack MOT wiring

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Finn Hammer <f-h-at-c.dk> 



Tesla list wrote:
>Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
>Can you draw this for me?

http://home5.inet.tele.dk/f-hammer/hydrogen18.jpeg

HTH, finn Hammer
>--=Eric
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Wednesday, March 03, 2004 12:20 PM
>Subject: Re: 280 Variac + 4 Pack MOT wiring
>
>  > Original poster: Finn Hammer <f-h-at-c.dk>
>  >
>  > Young Hydrogen18,
>  >
>  > Getting the grounding correct is not easy, so although it would probably
>be
>  > too harsh to say that you "Missed the point completely", still your
>circuit
>  > would not work as intended in the state that you have posted it.
>  >
>  > The center connection of the 2 sets of MOT`s primary`s are connected to
>the
>  > wiper of the variac, that`s ok.
>  > The other side of the MOT pairs are connected together and stuck into the
>  > ground.
>  > If you intend to actually connect it to a ground rod, bear in mind that
>the
>  > impedance of a ground connection is high, and might not allow the passage
>  > of high currents without a voltage drop.
>  > But even then, if you are omitting to draw, but imply a wire to the center
>  > of the distribution transformer, it won`t work well:
>  > With the variac at it`s CCW position, you will have 120volts across the
>  > paralleled MOT pairs, with the wiper in the midle position, you wil get 0
>  > volts and at the CW position there will again only appear the 1/2 voltage
>  > across your mot`s primary windings.
>  >
>  > What you need to do is simple, though:
>  >
>  > Establish a virtual "neutral" reference at one end of the variac, either
>  > will do equally well, it only depends on which direction you want to turn
>  > the variac to "turn up the wick", and connect the formerly grounded wire
>  > from the MOT`s to this point, and you will be up and flying.
>  >
>  > If you have the secondary`s phased relative to the primary`s, that is...
>  >
>  > Hope this helps,
>  >
>  > Cheers, Finn Hammer
>  >
>  > Tesla list wrote:
>  >
>  > >Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
>  > >Do I have this schematic anywhere near right? The MOTS are supposed to be
>  > >wired so that each set of 2 is out of phase from the others so that one
>is
>  > >producing -5000 while the others are producing +5000 for a difference of
>  > >10000. The sliding shunt ballast is still under design.
>  >
>  ><http://www.hydrogen18-dot-com/stuff/IMG_5354.JPG>http://www.hydrogen18-dot-com/stu
>ff/IMG_5354.JPG
>  > >
>  > >
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