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Re: My new transformer
In a message dated 3/30/00 12:33:51 PM Pacific Standard Time,
tesla@pupman.com writes:
> Original Poster: dbortoluzzi@sogeda.it
>
> hi all,
> I would like to ask to all the pros on the list one thing about a new
> transformer I had from a friend.
> The transf. is rated 3000 V if 100 V are applied .. he told me I can also
> put
> 220 V in and get around 6000 V from the secondary cause margins are huge
> It is also rated 50 VA (!) .
Daniele,
Usually if a transformer is rated for 100V input, it will saturate if 220
volts
are applied. If your friend knows for a fact that the transformer can handle
220 volts input, then that's one thing. The transformer may be able to
handle 220 volts input insulation-wise, but not saturation-wise. It all
depends on the volts per turn for which the transformer was designed.
Anyway, if you hook it up with a variac as a voltage control, and raise
the voltage while monitoring the current (no secondary connection),
and the current starts to rise a lot as you go over 100 volts, then you'll
know that it's saturating, and is not suitable for 220 volts input.
Now 50VA is actually a very small transformer, most NST's are 360VA
or more. 50VA is sort of like 50 watts (power factor...blah...blah). Or
do you perhaps mean to say 50A which is indeed a strong input. Beware
of the lethal aspects of this transformer too.
> and it is made with red resin
> the question is "what if I put a variac between the primary of the transf.
> and mains ?"
> Is it possible I blow up something ?
> I also would like to know how can I build a current limiter for this animal
> (50 VA are not few)
> cause I really do not know if this tr. is current limited...my suspect is
> not, cause it was used in a "High Voltage Central" (He also has some 15
> Kilos babes, but not for me at the moment)
> I was with him in the central near two 2100 VA huge transf. that were
> buzzing a lot...
Probably not current limited. A variac is meant normally for voltage
control when used in it's intended manner. Variacs can also be used
in series with the transformer input, as a current controller, with varying
degrees of success.
Cheers, and good luck,
John Freau
>
>
> tnx to all in advance for help
>
> Daniele