Re: MOTS (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 28 Oct 2006 19:46:29 -0600
From: S&JY <youngsters@xxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: MOTS (fwd)

I have two ganged variacs, each fed off a different phase of 120 volt mains.
Each variac powers three MOTs whose primaries are in parallel.
--Steve Y.

----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, October 27, 2006 11:44 PM
Subject: Re: MOTS (fwd)


> Original poster: List moderator <mod1@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sat, 28 Oct 2006 01:41:30 -0400
> From: mercurus2000 <mercurus2000@xxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: MOTS (fwd)
>
> Do these MOTs have the primaries in series or parallel?
> Tesla list wrote:
>
> >Original poster: List moderator <mod1@xxxxxxxxxx>
> >
> >
> >
> >---------- Forwarded message ----------
> >Date: Fri, 27 Oct 2006 23:13:15 -0600
> >From: S&JY <youngsters@xxxxxxxxxxxxxxx>
> >To: Tesla list <tesla@xxxxxxxxxx>
> >Subject: Re: MOTS (fwd)
> >
> >Richard,
> >
> >I run 6 MOTs in oil in series, with the center of them grounded.  I keep
the
> >voltage to each below 100 and usually below 85 VAC.  Running yours at 80
> >volts is an excellent idea.  I measured no-load current draw for 4 MOTS:
80
> >volts was 1 amp, 90 volts drew 3 amps, 100 volts was 5.5 amps and 118
volts
> >took 17.6 amps!  MOTs stay happy at 90 volts or less.
> >
> >In my opinion, you are pressing your luck to attempt 12 MOTs in series.
I
> >have heard of 8 in series, but I am sure 12 in series will be highly
> >succeptable to breakdown (secondary to core to primary arcing) even under
> >oil.  The outer windings will have peak voltages of about 6 x 2000 x 2/3
x
> >1.4 = about 11,200 volts.  Why not just use two banks or three for
starters.
> >Then if you really need more power, buy one of D. C. Cox's distribution
> >transformers.
> >--Steve Y.