That's about windings, and of course in the primary of a 3 phase transformer you'll generally (/there are exceptions.../) have 3 windings, but those 3 windings together make up the primary side of the transformer.
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. Sergio On 2018-12-20 13:27, Xavier wrote: > On Thu, Dec 20, 2018 at 01:00:20PM +0100, Sergio Manzi wrote: >> I *never *heard of a transformer's /tertiary/, thus: try asking an >> electrical engineer... > > In general, a transformer can have 1..N primary windings and 1..N secondary > windings: > > https://www.electronics-tutorials.ws/transformer/multiple-winding-transformers.html > > 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). > > 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. > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging
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