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Re: 40 Amp variac ballast
to: Dwight
Yes, you do need to make it into a "gapped core non-saturable reactor" by
cutting the slot. 140 to 150 turns of #10 AWG will give you the current
control around 25-35 amperes. You need the #10 because the instataneous
peaks are usually around 50% higher than the average current and #12 or 14
will get very hot.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: 40 Amp variac ballast
> Date: Thursday, September 17, 1998 2:56 PM
>
> Original Poster: dwight duncan <duncand-at-ccsalpha2.nrl.navy.mil>
>
>
> Hello All,
>
> I just recently got an old 40 amp variac and stripped it down to
> the core. My question is do I need to put a .125" gap in the core if I
am
> using a 5 KVA pig. I may at times push the pig further than 5 KVA but I
> don't think beyond 35 amp input current. I will probably stay at 25 amps.
> BTW, the primary voltage rating on this pig is 14.4 KV.
>
> Thanks for any answers to my question,
>
> Dwight
>