Key:voltage:tertiary
 voltage:tertiary
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| Description |
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Voltage of a transformer interface which delivers power to small loads or auxiliary services. 
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| Group: power |
| Used on these elements |
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| Requires |
| Useful combination |
Status: approved
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| Tools for this tag |
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A transformer is a power device and it has got different interfaces that can be documented separately.
See dedicated documentation about those interfaces.
Some configurations may be complex, see windings=* also for more information.
The tertiary voltage is the voltage bound to the tertiary interface of a power transformer, that outputs the power to small (local) loads.
It may correspond to (auxiliary winding) when feeding auxiliary services of local power grid facilities.
It's a constant design convention we intend to describe here. As of today, power can actually flow in every direction connected to a power transformer depending on power grid operational status OSM isn't aware of and then won't change tertiary side established during mapping.
How to find the value
For every transformer=*
Tertiary voltage is lower than minimum of voltage:primary=* and voltage:secondary=*.
It usually has a limited rating than primary and secondary interfaces.
It doesn't matter of the purpose of the transformer, in a power plant or not.