[TCML] Transformer Sources
FIFTYGUY at aol.com
FIFTYGUY at aol.com
Sat Mar 14 08:08:56 MST 2009
In a message dated 3/14/09 8:57:35 A.M. Eastern Standard Time,
jimlux at earthlink.net writes:
>> It's a standard application for an autotransformer. "Buck/boost" is
>> industry term.
>Buck boost connection can be an autotransfomer, but often isn't: the
>usual transformers I've used have totally separate windings; while I use
>autotransformer to refer to things like a variac, where it's one
>continuous tapped winding. Yes, they're electrically about the same.
Maybe I'm nit-picking, but like I said, buck/boost transformers are usually
*built* as isolating transformers, but the connection is almost always as an
autotransformer. Most applications are for a specific circuit - you don't
usually power the primary of a buck/boost off one circuit but connect the
secondary to another circuit. At least I've never seen it done that way. I'd have
to look to see if it's even allowed by Code - good question? Usually you're
stuck with the wrong voltage because a load draws too much current on a long
run of small conductors, and you need the extra voltage to get the load to run
right. Easier than replacing the conductors or wiring to a different voltage
>There's also often a higher insulation between pri and sec on the
>buck/boost than on an autotransformer.
Again, I don't see why, considering the usual connection is as an
autotransformer anyhow. I suppose the voltage difference between adjacent parts of
the primary and secondary *could* be higher depending on how you wired a
buck/boost, but the basic insulation levels for any commercial transformer should
be sufficient. Unless you're talking about a high-voltage transformer, then
obviously there would be more attention given to insulation.
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