Re: [TCML] 20KV transformer ? (UK)

["Chris Swinson" <list@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi Derek,

I am plotting a choke charge design. Was thinking of using 2 MOT in series 
to give around 5KV, then convert to 7KVDC or there abouts. Then using a RSG 
with a large choke to double to about 14KV..

40Kv sounds interesting, not sure I dare go that high, but could be 
interesting!

cheers,
Chris



----- Original Message ----- 
From: "Derek" <tesla@xxxxxxxxxxxxxxxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, November 14, 2007 4:25 PM
Subject: RE: [TCML] 20KV transformer ? (UK)


> Chris
> Why not use your two NST's in parallel into a voltage doubler making a 20 
> Kv
> DC supply, this does actually charge two cap banks in series one in 
> the -ve
> cycle and the other in the +ve cycle.
>
> Or (if you have a rotary) rectify the two nst's and use a large charging
> choke and a d-queuing diode. This  will give you roughly double the input
> voltage when the coil is running.
>
> or use both ideas to give you 40KV...
>
> Alternatively if you have 4 mot's remove the HV windings and use 2x mains
> windings on each of 2 MOT cores to make 2 isolating transformers so you 
> can
> drive your two nst's in series. The centre connection of the two nst's 
> (not
> the cases) connected to earth.
>
> Do not earth the cases, and be very careful in operation as the case of 
> each
> will be at 5Kv WRT Earth
>
> Cheers
> Derek
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Chris Swinson
> Sent: 14 November 2007 15:27
> To: Tesla Coil Mailing List
> Subject: [TCML] 20KV transformer ? (UK)
>
> Hi all,
>
> looking for a 20KV 50mA supply if anyone can help. I have 2 10KV NST's 
> here
> which I use, though I can't link those in series as they are centre tap to
> ground anyway :-(  So wonder if there is any 10KV types which can be 
> linked
> in series for 20KV.
>
> Was also wondering if the output voltage could be increased without a 
> large
> charging choke. Would there be any way to charge up 2 cap banks in 
> parallel
> and discharge them in series to get 20kv ? I half have an idea of instead 
> of
> running at 100bps run at 50bps and gain a charge in 1 cap on positive 
> mains
> cycles and charge the second cap on the negative mains cycles ?
>
> cheers,
> Chris
>
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