Tag:transformer=main

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Public-images-osm logo.svg transformer = main
Transformers at Kraftwerk Kachlet, Passau.jpg
Description
Power transformers that forward power between different voltage grids inside a substation. Edit this description in the wiki page. Edit this description in the data item.
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
Useful combination
Status: approvedPage for proposal

Main transformers are forwarding power between different parts of a substation.
That kind of transformer are found in substations only.

Most of their capacity is dedicated to power forwarding between different voltages, opposite of auxiliary which feed local substations or premises only.

See power=transformer to get complete guidelines to map them

Examples

Photo Location Tagging Note
380/110 kV Trafo, Kriegenbrunn Germany

nodepower=transformer
transformer=main
location=outdoor
voltage:primary=380000
voltage:secondary=110000
voltage:tertiary=20000
manufacturer=Alstom
phases=3
windings=3
frequency=50

Large outdoor main power transformer in a transmission power substation
225kV => 63kV + 10kV France

power=transformer
transformer=main
location=outdoor
voltage:primary=225000
voltage:secondary=63000
voltage:tertiary=10000
windings=3
windings:primary=1
windings:secondary=1
windings:tertiary=1
phases=3
frequency=50
rating=70000000

This transformer has 3 windings operating at 3 different voltages. 225kV side is on the foreground while 63kV is hidden at the back


Tertiary winding is dedicated to 10kV, certainly for auxiliary services including transformer cooling system

Description of a 225kV to 20 kV transformer France

power=transformer
transformer=main
location=indoor
voltage:primary=225000
voltage:secondary=20000
windings=2
windings:configuration=star
windings:primary=1
windings:secondary=1
phases=3
frequency=50
rating=70000000

This plate can be seen on transformer themselves (picture taken with power grid operator acknowledgement) and gives the windings configuration with several other figures. All tags can be defined with it.


Upside schema on the left informs us that all windings (A, B, C and a, b, c) are connected to neutral point (N), which match the IEC 421-10-01 of star connection definition.
70 MVA rating is taken from the last column of the left table.

63kV => 20kV France

power=transformer
transformer=main
voltage:primary=63000
voltage:secondary=20000
windings=2
windings:primary=1
windings:secondary=1
phases=3
frequency=50
location=outdoor
rating=20000000

20kV => 15kV autotransformer France

power=transformer
transformer=main
voltage:primary=20000
voltage:secondary=15000
windings=2
windings:primary=1
windings:secondary=1
windings:auto=yes
phases=3
frequency=50
location=outdoor

Such transformer are used in France to feed legacy 15kV distribution zones from current 20kV infrastructures.


Visible sign show us operational voltages of both sides and that the transformer works as an auto-transformer.

225kV => 50kV transformer France

power=transformer
transformer=main
voltage:primary=225000
voltage:secondary=50000
windings=2
windings:primary=1
windings:secondary=1
phases=2
frequency=50
location=outdoor

High speed rail lines are fed from transmission power grid with such biphase transformers.

More information about French 50kV traction system on this chart
They are located in a substation=traction substation fenced perimeter.

-25kV feeder => 25kV catenary auto-transformers France

On one of each transformer inside of the substation
power=transformer
transformer=main
voltage:primary=-25000
voltage:secondary=25000
windings=2
windings:primary=1
windings:secondary=1
windings:auto=yes
phases=1
frequency=50
location=outdoor

Due to pretty long distances, high speed rail 25kV contact lines have to be regularly fed by auto-transformers which take power from a -25kV feeder line going along railways.

They are located in a substation=traction substation fenced perimeter.

A transformer in a substation cabinet France

man_made=street_cabinet
street_cabinet=power
power=substation
substation=minor_distribution
transformer=main
voltage:primary=20000
voltage:secondary=400
operator=Enedis
phases=3
frequency=50
location=green

A simple substation (see POSTE meaning substation in French) can contain a single transformer with a very few equipment. This can be mapped in OSM as a node and then use substation=* and transformer=main simultaneously.