Re: A low inductance MMC

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "K. C. Herrick" <kchdlh@xxxxxxx>

Finn (& all)-

In my current try at redesigning my s.s.t.c. 
primary (see 
<http://hot-streamer.com/temp/TCH-NEWPRI.JPG>http://hot-streamer.com/temp/TCH-NEWPRI.JPG), 
I'm expecting that the capacitor strings' 
inductance will be added to that of the coil 
proper, in providing flux to the secondary.  In a 
low-inductance s.s.t.c. could you not merely 
array the capacitors in the same manner, without 
a coil per se, to implement the 1-turn primary "coil"?

Also -- and I shudder to think of it -- what 
happens if a capacitor somewhere inside your MMC 
decides to "go south"?  Aarghh!...

Ken Herrick

Tesla list wrote:
> Original poster: Finn Hammer <mailto:f-h@xxxx><f-h@xxxx>
>
> All,
>
> A while ago I designed an attempt at a low 
> inductance MMC. It is for OLTC service, so a 
> small inductance is important, because the 
> inductance of the coil`s one turn primary only is 374nH.
>
> The idea was to create a return path from the 
> far end of the capacitor strings back to the 
> start of the strings, which would eliminate the 
> loop area of the return by distributing it within the pack of strings.
>
> When I fitted it to the coil, I had to remove 
> 3µF out of 17µF to tune the coil, which means 
> that this cap added ~87nH of inductance to the coil.
>
> Here are some pictures:
>
> <http://home5.inet.tele.dk/f-hammer/bottom.jpg>http://home5.inet.tele.dk/f-hammer/bottom.jpg 
>
>
> http://home5.inet.tele.dk/f-hammer/top.jpg
>
> <http://home5.inet.tele.dk/f-hammer/top2.jpg>http://home5.inet.tele.dk/f-hammer/top2.jpg 
>
>
> http://home5.inet.tele.dk/f-hammer/detail.jpg
>
> Cheers, Finn Hammer