Re: MOVs and NSTs

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Jonathon,

You actually ask a remarkably complex question!

How much RMS current should a given NST and draw...  When is the current
"normal" given a coil system's design and the user cranking up the variac to
140VAC, and when should the system blow the fuse...  What is the inrush curent
that the fuse needs to stand while still providing protection....  How do PFC
caps play into this...

For your purposes, the NST will draw maybe 15 amps normally.  If you have
properly sized PFC caps, then maybe 7 amps.

I'll spare all the details here, but sounds like another big computer study of
many systems is needed to come up with a chart... 

Cheers,

        Terry

At 09:40 PM 7/25/2001 -0400, you wrote: 
>
> About Fusing them, to what percent of the Normal current draw should you fuse
>
> them to? I.E. for a 12/60 which draws 720/120=6 A should I fuse it to 6 1/4, 
> or 7? 
>
> --------------------------------------- 
> Jonathon Reinhart 
> hot-streamer-dot-com/jonathon 
>
>
>>
>>
>> I would also recommend fusing the input of the NST so that if the cores 
>> saturate and the NST starts to go nuclear, the fuse will blow before the 
>> NST.  With a properly set up filter and an input fuse.  There is no known 
>> way to blow an NST.  The NST may die of old age or something but they 
>> usually die do the terrible stress being put on them that the filter and 
>> fuse will stop. 
>
>