Display transformer=distribution as node substations

[flacombe]

Rural power networks implies to install minor distribution transformers on top of poles when enough place isn't available on ground or when there is not enough customers to require a powerful substation in a real building.
Is it possible ton consider power=* + transformer=distribution as a substation and display it the same way as nodes with power=substation on them please?

[russss]

The wiki seems to indicate that these should be mapped as power=pole; transformer=yes - I'm not sure sure if I import the transformer tag yet but I'll look into doing so.

[flacombe]

transformer=distribution is more precise than transformer=yes and it's the same meaning.

[Gazer75]

This is really needed as currently only separate items like street cabinets with power=transformer will be displayed. Often tucked in between the two "legs" of a H-frame design in rural areas around here.

[pyrog]

Sometimes substations on poles are tagged power=pole + substation=minor_distribution.

So could you, please, display the following tags as substations ?

• power=* + transformer=distribution
• power=* + substation=minor_distribution

[Gazer75]

A power pole combined with substation is a tagging mistake.
The only combination on wiki is transformer=distribution which is kind of stupid.
To make it more in line with the substation values the transformer value should be minor_distribution for these pole mounted ones.

[flacombe]

It is currently a tagging mistake but it's not illogical.

A pole with a local distribution transformer is first of all a substation.
Since we map all that stuff together on the same node in OSM, the node should have
power=pole
substation=minor_distribution
transformer=distribution

There will be a proposal on that topic, but it needs time to write
https://wiki.openstreetmap.org/wiki/Proposed_features/Substation_nodes_extension

[Gazer75]

Sorry, but no. A pole with a transformer is nothing but that. There is often a mechanical switch to disconnect the transformer, but that is it.
Substations have busbar(s) and switches, usually combined disconnectors and circuit breakers. Even small compensators are that uncommon.

I will down vote any proposal to call a pole with a transformer for a substation.

[russss]

I'd rather not have this argument in the issue comments here, but it's worth noting that the IEC vocabulary does include "pole-mounted substation". I'm not sure it's worth the effort of changing the tagging and making it more complex, though.

It's likely I will import both of these tags and render them both, as there will be overlap. Neither are imported at the moment so this will have to wait until I reimport.

[flacombe]

No problem, we'll have this discussion once the proposal will have been written.

Please note that French DSOs all (160 companies) call a transformer on a pole a "substation".
This is part of the official network documentation and operational terminology.
This is even written on ground with a big "SUBSTATION" on the pole itself, there are about 150 000 of them in France.

Thank you Russss to make that global import.

[pyrog]

If you use osm2pgl to feed your database, seem possible to use Lua tag transformations to do that.

power=pole and substation=* → power=substation

And new substations on poles could be rendered without reimporting the db 😎

Note : Is it possible to do that with imposm ?

Seem that default condition is OR. Don't know if we could use AND condition.
See https://imposm.org/docs/imposm3/latest/mapping.html#mapping

[pyrog]

Extract of mapping.json

         "type_mappings": {
            "points": {
               "power": [
                  "substation",
                  "sub_station"
               ],
               "construction:power": [
                  "substation",
                  "sub_station"
               ]
            },
            "polygons": {
               "power": [
                  "substation",
                  "sub_station"
               ],
               "construction:power": [
                  "substation",
                  "sub_station"
               ]
            }
         },
         "type": "geometry"

Could be possible if we map substation=*

[russss]

This is done now!

[flacombe]

This is great, thank you @russss