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R: ballasting



Tnx Cabbot,

I also read about welders as limiters...
There is a industrial scrap place near home that always have LARGE
welders...
I would like to dismantle one of these to recover the variable
transformerand parts  and use them to build  a variable inductive load. I am
going the right way ?

Ciao a tutti

Daniele
-----Messaggio originale-----
Da: Tesla List <tesla-at-pupman-dot-com>
A: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Data: mercoledì 10 maggio 2000 2.54
Oggetto: Re: ballasting


>Original Poster: "Cabbot Sanders" <cabbot-at-hash-dot-com>
>
>
>> Original Poster: "Daniele Bortoluzzi" <dbortoluzzi-at-sogeda.it>
> > I was wondering about power limiting issues, in effect a friend told
that
>a
>> primary ballast, is it resistive or inductive, will reduce the voltage
>input to the transformer.. is this right ?
>
>Yes, well, sort of.  In fact the resistive ballast DOES limit the voltage
>going into the NST or pig, therefore limiting the voltage output.  An
>inductive ballast, however, limits the CURRENT more than the voltage, hence
>achieving higher voltage in the primary. :)
>
>> So, what do you think is the good combination ?  Variac and ballast ?
>Variac
>> only ? Variable ballast only ???
>
>It's a tough choice, we've all thought about that one. I personally have
put
>together my ballast with a combination of the two.  I have yet to get my
>'big bruiser' coil operating however, because of my brain injury.
>
>> Imagine I want to build a "Triac based" (I have a 400 Volt 20 Ampere one)
>watt
>> absosption limiter rated
>> for something like 1.5KVA maximum, am I going the right way to limit
>current
>> absorption from the transformer ?
>> Is this triac suitable for coil use ???
>> This cause I would like to have a "precise" limiting value... with a nice
>> tweedling knob there to play with power ;)
>
>That would be fun to do! regardless of the risk of limiting any power.
>
>