Tag:transformer=traction

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Public-images-osm logo.svg transformer = traction
Commons-emblem-hand.svg
Description
Using this tag is discouraged, use transformer=main instead. Edit this description in the wiki page. Edit this description in the data item.
Group: Power
Used on these elements
should not be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations
Requires
Useful combination
Status: deprecatedPage for proposal

exclamation mark

This feature has been labeled as deprecated. The recommended replacement is: transformer=main.
The reason is documented in Deprecated features. You are still free to continue to use or interpret this tag as you see fit since OpenStreetMap does not have “banned features”.
Under no circumstances should you (semi-)automatically change “deprecated” tags to something else in the database on a large scale without conforming to the automated edits code of conduct. Any such change will be reverted.

Despite special transformers architectures can be used to feed transportation traction systems, they're not specific to traction.
We can find similar devices for industry or research use cases.

As to properly describe such systems, see substation=traction to tag a substation hosting power supplies for transportation.
Those transformers are actually best described with transformer=main and possibly windings:configuration=* if you're knowledgeable about their internal parts.

See power=transformer for additional details and how to map directives