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Re: [TCML] Self ballasting transformers
I think that most small power transformers have no real current limiting,
other than core saturation. Many contain a fusible link inside that prevents
overheating, but it's not replaceable. Others may be impedance protected as you
say, by using many turns of small wire to yield enough impedance to prevent
overheating even when overloaded.
Tony Greer
In a message dated 11/9/2008 8:33:34 A.M. Central Standard Time,
bsneath@xxxxxxxxxxxxxxxx writes:
hi all,
I have a question regarding the self-current-limitting transformers that are
used in most old appliances.
It would seem that they have no shunts at all, and the only way they ballast
themselves is with a large number of primary turns.
To clarify, the transformers i'm talking about are those little <100watt
ones that powered stuff like DVD players etc. before switching psu's took
over.
But how does it work?
Another thing, when i put a new secondry on one such xfrmr after extending
the core (by using 2 E sections back to back instead of the usual E I
construction), the current limiting no longer worked as well and i could
draw more power out of it than it was rated for.
so, how do these xfrmrs self-limit, and how does the core extension affect
it?
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