Key:windings:auto

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Public-images-osm logo.svg windings:auto
Power autotransformer distribution1.jpg
Description
Auto-transformer architecture for some power transformers
Group: Power
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations
Requires

transformer=*

Useful combination
Status: approvedPage for proposal

An Auto-transformer (421-01-11) is a particular transformer architecture, only relates to special arrangements of their winding and could be used for mostly all roles.
You could find such auto-transformers in distribution, transmission, traction or converter substations.
This key lets mappers state if a given auto-transformer is main or auxiliary.

Auto design could be achieved with star, delta or others winding arrangements, then it wasn't possible to add windings:configuration=auto neither.
windings:auto=yes allows combinations with windings:configuration=star, windings:configuration=delta as to state the actual windings arrangements.

Auto-transformers use to get a lower rate between their voltage:primary=* and voltage:secondary=*.

A special sign allows to visually and safely distinguish auto-transformers from standard ones. See illustration.

See power=transformer for more information and examples.

Examples

Photo Location Tagging Note
Power autotransformer distribution1.jpg France

power=transformer
location=outdoor
voltage:primary=20000
voltage:secondary=15000
windings:auto=yes
phases=3

A small plate indicates this transformer is an auto-transformer.