|Voltage of a transformer interface which delivers power to small loads or auxiliary services|
|Used on these elements|
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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.
The tertiary voltage is the voltage bound to the tertiary interface of a power transformer, that outputs the power to small loads.
It may correspond to (auxiliary winding) when feeding auxiliary services of local power grid facilities.
Some configurations may be complex, see windings=* for more information.