Re: MOT power supply

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

Original poster: "David Speck by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-davidspeckmd-dot-org>

Mat,
Although the transformers see only their own output voltage across their 
output terminals, the problem is that the core of the outermost transformer 
is sitting at least 4 kV above ground, and the primary windings are, for 
all practical purposes, at ground potential.  The critical factor is the 
insulation ability between the hot core of the transformer and the primary 
windings.  That's why oil immersion helps prevent secondary to primary 
breakdown of the outermost transformers in the string.
Dave

>>lots of others have built the mean 6 pack machine without frying their
>>MOT's running the outer secondaries at 3X typical insulation rating.
>>...so MOT's are more durable than one might think.
>
>
>There is a critical difference between the output voltage across a group 
>of seriesed MOTs and the breakdown voltage of a single MOT. For example, 
>with 6 in series,
>each MOT only sees a voltage drop of 2KV ACROSS IT  when the pack output 
>is 12KV. At no time is the insulation of any one MOT subject to the full 
>potential difference.
>
>Matt D.