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A transformer is a power device and it has got different interfaces that can be documented separately. See dedicated documentation to get more information about those interfaces.
Voltages are bound to those interfaces and voltage-high=* / voltage-low=* can be in use in many places. Some mappers may be more confident by using high and low voltages and such information may help to define primary, secondary, tertiary voltages as following:
- voltage-low=* = voltage:secondary=* in case of down transforming, like in power consuming places. The power is taken from high voltage grid to feed some distribution network at a lower voltage
- voltage-low=* = voltage:primary=* in up transforming places like power plants. Generators produce pretty low voltage power whereas transmission power grids operate at very high voltage. According to definition, the power generator side is definitely the primary interface and here at lower voltage than the secondary.