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#1 tapanpatel

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Posted 09 September 2005 - 03:56 AM

what are the applications of three winding transformers? and what it is exectly ?

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#2 RalphChristie

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Posted 09 September 2005 - 12:56 PM

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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