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Re: Transformer Shunts

Original poster: Gregory Hunter <tesla_39560@xxxxxxxxx>

--- Tesla list <tesla@xxxxxxxxxx> wrote: > Original poster: "Paul B. Brodie" > <pbbrodie@xxxxxxxxxxxxx> > > What exactly are transformer shunts and how do they > function? > Paul Brodie >

Transformer shunts are small bundles of transformer
iron (laminations). They are tucked into the
transformer core windows physically between the
primary and secondary coils. Usually they are shimmed
with card stock to prevent them from making
iron-to-iron contact between the inner and outer core
legs. Alternatively, the shunts may be stamped out as
part of the main transformer lamination, but with a
tiny air gap on one end, again, to preclude
iron-to-iron connection between the inner & outer core
legs. Their function is to limit current through the
transformer by shunting some of the magnetic flux away
from the secondary. As primary current approaches the
design limit, the shunts sort of short out some of the
magnetic field to prevent it reaching the secondary.
Neon sign transformers, oil burner ignition
transformers, and microwave oven transformers are
examples of shunted transformers.

Gregory R. Hunter