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<p>Good, thank-you!</p>
<p>I wasn't aware of that, but I'm not an EE and that's why I've
asked to ask one: this kind of things are much better handled by
experts in the field.<br>
</p>
<p>But anyway I have the strong feeling that that wasn't the meaning
the person who described transformers had in is head: "<i>Tertiary,
quaternary and further sides are intended for lower voltages
auxiliary services inside power plants or substations</i>",
which, in the description you pointed at, is <u>at most</u> a
"by-product" of using a tertiary .<br>
</p>
<p>Sergio</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2018-12-20 14:05, Paul Allen wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPy1dOKmRA-96GfUDL9OGDjdD94BaJmMKZ6qyX7ReXek+u6qQg@mail.gmail.com">
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<div dir="ltr">
<div dir="ltr">On Thu, 20 Dec 2018 at 12:36, Sergio Manzi <<a
href="mailto:smz@smz.it" moz-do-not-send="true">smz@smz.it</a>>
wrote:</div>
<div dir="ltr"><br>
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<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">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.<br>
</div>
</blockquote>
<div><br>
</div>
<div>Power transformers can have tertiary windings:</div>
<div><a
href="https://www.electrical4u.com/tertiary-winding-of-transformer-three-winding-transformer/"
moz-do-not-send="true">https://www.electrical4u.com/tertiary-winding-of-transformer-three-winding-transformer/</a>
<br>
</div>
<div>although it may not be sensible to map the ratings of a
tertiary.</div>
<div><br>
</div>
<div>Some transformer-isolated voltage converters may make use
of a feedback winding which is</div>
<div>(at least informally) referred to as a tertiary winding.</div>
<div><br>
</div>
<div>-- <br>
</div>
<div>Paul</div>
<div><br>
</div>
</div>
</div>
<br>
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