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<p>That's about windings, and of course in the primary of a 3 phase
transformer you'll generally (<i>there are exceptions...</i>) have
3 windings, but those 3 windings together make up the primary side
of the transformer.<br>
</p>
<p>The definition of primary v.s. secondary is about which is the
exciting part and which is the excited part. "tertiary" is pure
nonsense, AFAIK.</p>
<p>Sergio</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2018-12-20 13:27, Xavier wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20181220122712.GP20400@d820.dp100.com">On Thu, Dec 20,
2018 at 01:00:20PM +0100, Sergio Manzi wrote:
<br>
<blockquote type="cite">I *never *heard of a transformer's
/tertiary/, thus: try asking an electrical engineer...
<br>
</blockquote>
<br>
In general, a transformer can have 1..N primary windings and 1..N
secondary windings:
<br>
<br>
<a class="moz-txt-link-freetext" href="https://www.electronics-tutorials.ws/transformer/multiple-winding-transformers.html">https://www.electronics-tutorials.ws/transformer/multiple-winding-transformers.html</a>
<br>
<br>
The most common is the 1:1 (single primary, single secondary)
transformer, followed next by a 1:N style (one primary, multiple
secondary, this is usually used to provide plural output voltages
from the same single transformer).
<br>
<br>
But in the general case (which is what OSM would, at some point,
want to be able to cover), a transformer is N:N with each N being
1..X.
<br>
<br>
<br>
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