[TCML] Transformer Sources
jimlux at earthlink.net
Fri Mar 13 21:28:43 MST 2009
FIFTYGUY at aol.com wrote:
> In a message dated 3/13/09 6:42:25 P.M. Eastern Standard Time,
> bunnikillr at cox.net writes:
>> Lost me on this set up... where can I find some schematics on this type
>> of wiring? Im still trying to understand how a 400VA trannie can handle
>> 2.5KW load...
>> Is the low voltage trannie added to the line voltage for 140V?
> It's a standard application for an autotransformer. "Buck/boost" is the
> 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.
> Most buck/boost transformers are used on 120, 208, or 240 VAC circuits
> where the voltage isn't where it should be for one reason or another. A common
> application might be bringing a 208V circuit closer to 240V so a 240V device
> can run better. Or compensating for the voltage drop from a heavy load.
> Also, buck/boost transformers are *used* as auto-transformers, but they
> are *built* as standard isolating transformers to allow many connection
> options. We've used buck/boost transformers as high-current sources (up to 1500
> Amps). The secondary windings tend to be terminated in lugs that stick out of
> the potting resin, and require bolted lugs for cable connections.
There's also often a higher insulation between pri and sec on the
buck/boost than on an autotransformer.
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