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Tree winding transformer is a transformer with three windings per phase, thus like in a single trsf with a High Voltage, Medium Voltage and Low Voltage winding.


Most common reason for the addition of a third winding is for the provision of a delta-connected tertiary winding. (connection in delta to provide a low-impedance path for third-harmonic currents)


Other reasons:

To limit the fault level on the LV system by subdividing the infeed - thus double secondary transformers.

Interconnection of several power systems operating at different supply voltages.

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