Re: 25 kV PT

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "resonance" <resonance@xxxxxxxxxxxx>




Most center-tapped transformers, such as x-ray and neon sign 
transformers, are wound with the sec coil turns in opposite 
directions.  This enables one sec coil to hit a peak on the positive 
1/2 cycle while the opposite winding hits a peak on the negative 1/2 
cycle while the two windings are on the same core.  This produces a 
bushing to bushing potential of double the value of each winding.
If he uses two similar xmfrs with both coils wound in the same 
direction both xmfrs will hit a peak of 25 kV at the same time while 
they are at 0 potential on the opposite 1/2 cycle swing.  With AC he 
will only see 25 kV to ground and will not see the 50 kV peak to peak 
he is trying to obtain.
Maybe I missed something here but I don't think this will work as he 
is planning to use them to develop 50 kV peak to peak between the outputs.
If he had two coils wound in opposite directions and tried to operate 
them in epoxy there is a very high proabability they would 
fail.  Operation above 25 kV produces high corona content and all 
xmfrs that I know use oil instead of epoxy for these high voltages.
Tesla's transformer were oil insulated.  You can use oil insulation 
with HV transformers to operate as high as 1,000 kV (megavolt) 
outputs. Allis-Chalmers manufactured some of these large monsters in 
Milwaukee, WI. They were used at Sandia and Los Alamos Nat'l Labs for 
some specialized testing.
Dr. Resonance



> Why is that if it's center tapped and +/- 25kV?  Granted the primary 
> tank wiring better be well thought out due to corona and all. Tesla 
> used 50kV transformers at times
> Mike
>
>
>
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