[Tagging] Feature proposal - RFC - Power transformers classification

[François Lacombe]

Hi John,

Thank you for this documentation!
We're talking about the same thing, this tertiary winding can also be used
to feed auxiliaries (i.e cooling vents mainly).
This additional winding can also act as a stabilizer on some particular
configurations (star-star) depicted in your documentation.
https://electropedia.org/iev/iev.nsf/display?openform&ievref=421-03-09

There is no "secondary winding at a different voltage (than the main
secondary)". If it's a different voltage, it's a different interface.
https://wiki.openstreetmap.org/wiki/Key:windings#Windings_counting

Best regards

François

Le mar. 10 août 2021 à 22:36, John Sturdy <jcg.sturdy at gmail.com> a écrit :

> I think that what you're calling a "tertiary winding" is actually a
> secondary winding at a different voltage.  A "tertiary winding" appears to
> be something else, according to various references such as
> https://www.vatransformer.com/wp-content/uploads/significance-of-tertiary-windings.pdf
>
> John
>
>
> On Mon, Aug 9, 2021 at 10:33 PM François Lacombe <
> fl.infosreseaux at gmail.com> wrote:
>
>> Dear all,
>>
>> Undergoing RFC on "Power substations on nodes" proposal enlighten some
>> inconsistencies on power transformers classification we should fix. It's an
>> opportunity to make things simpler as well.
>>
>> A second document has been written and you're are kindly invited to
>> express concerns or comments you may have about what is proposed.
>>
>> https://wiki.openstreetmap.org/wiki/Proposed_features/Transformers_classification_refinement
>>
>> Main points are:
>> * Introduce a new value transformer
>> <https://wiki.openstreetmap.org/wiki/Key:transformer>=main
>> <https://wiki.openstreetmap.org/w/index.php?title=Tag:transformer%3Dmain&action=edit&redlink=1>,
>> consistent with transformer
>> <https://wiki.openstreetmap.org/wiki/Key:transformer>=auxiliary
>> <https://wiki.openstreetmap.org/wiki/Tag:transformer%3Dauxiliary>, to
>> replace transformer <https://wiki.openstreetmap.org/wiki/Key:transformer>
>> =distribution
>> <https://wiki.openstreetmap.org/wiki/Tag:transformer%3Ddistribution>
>> only for transformers in a substation and transformer
>> <https://wiki.openstreetmap.org/wiki/Key:transformer>=traction
>> <https://wiki.openstreetmap.org/wiki/Tag:transformer%3Dtraction> every
>> time. It will be the default value.
>> * Introduce a new tag windings:auto
>> <https://wiki.openstreetmap.org/w/index.php?title=Key:windings:auto&action=edit&redlink=1>
>> =yes
>> <https://wiki.openstreetmap.org/w/index.php?title=Tag:windings:auto%3Dyes&action=edit&redlink=1>
>> to specify a given transformer is an auto-transformer, whatever its actual
>> role (main, converter...) could be.
>> * Deprecate existing transformer
>> <https://wiki.openstreetmap.org/wiki/Key:transformer>=traction
>> <https://wiki.openstreetmap.org/wiki/Tag:transformer%3Dtraction> and
>> transformer <https://wiki.openstreetmap.org/wiki/Key:transformer>=auto
>> <https://wiki.openstreetmap.org/wiki/Tag:transformer%3Dauto>
>>
>> Rationale will gives you more insights about challenges that should be
>> tackled.
>> transformer=traction directly regards railways power systems.
>>
>> All the best
>>
>> François
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