Re: MOT power supply

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

Original poster: "Finn Hammer by way of Terry Fritz <twftesla-at-qwest-dot-net>" <f-h-at-c.dk>

digital_raven45-at-hotmail-dot-com, Guys!

It is not the voltage across the windings that is the problem.
It is the secondary to primary voltage that is.

When you string these transformers together, the last transformer in the
string will have its secondary elevated to a potential that equals the
sum of all the transformers output voltage in that string. From the
ground point and out.

Since the primary coils all are at relative ground potential, the sum of
primary and secondary insulation to the core, on the last transformer,
is stressed beyond the design mark.

Typical insulation from winding to the core in a MOT is 7.5kV for 1
minute. It is only a question of how long they last.
This may well be adequate for coiling, and I encourage your attempts to
find the limit.

There are 2 mot`s in the blue plastic cylinders in the back:
http://home5.inet.tele.dk/f-hammer/tesla/ambassador/mainframe/mainf7.jpg

Pls. don`t be sarcastic, when we point out that the MOT`s are cheaply
built, it only serves to show that you are unaware of how a proper high
voltage transformer is made!

http://home5.inet.tele.dk/f-hammer/tesla/museum/pig/porkchop.htm

Cheers, Finn Hammer





Tesla list skriver:
 >
 > Original poster: "Tim J by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
<digital_raven45-at-hotmail-dot-com>
 >
 > >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.
 > --------------------------------------------------------------------------
 > Sure...thats right, the MOTs don't see 12kV+ running through them. I just
 > find it interesting that after so many people have built their successful
 > working 4 or 6 pack that we still have people out there claiming that these
 > supplies will flash over or fail over a period of time. I've had my 6 pack
 > now for a year, and have been abusing it too RF and large loads. I haven't
 > seen a change in the performance at all!
 > Just to see how far I could push these 'cheaply' made transformers, I built
 > an 8 pack last year. At first I had some flash over problems with one of
 > the transformers, but ater some modifications, I got the supply to work
 > under oil.