[Tagging] Power transformer voltage(s)

[François Lacombe]

Hi all,

Currently, power transformers' voltages are given by voltage=high;low or
voltage-high=* / voltage-low=* keys.

Recently I found a case for which all these aren't suitable.
http://www.openstreetmap.org/node/2387971998

Transmission transformers often have tertiary interfaces to feed
ventilation systems or substation's auxiliary power supplies.

I've used voltage:primary, voltage:secondary and so on to bring
single-valued keys instead of semicolon separated ones as a test.
They are more extensive than voltage-high, voltage-low which don't
explicitly target transformer's interfaces.

How do you feel about these points ?

All the best



François
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