Phase Shift Transformersup to 400 kV


A phase shifting transformer is a special type of system intertie transformers which Control the power flow through specific lines in a complex power transmission network by providing the possibility to insert a voltage with an arbitrary phase angle in the power system.

Note: The application of phase shifting transformers is mainly in high voltage systems (up to 420 KV) and the throughput power rating is quite large (up to 1630 MVA) 

Purposes of Phase shifting transformers:

  • To control the power flow between two large independent power systems
  • To change the effective phase displacement between the input voltage and the output voltage of a transmission line, thus controlling the amount of active power that can flow in the line.
  • To balance the loading when power systems are connected together in more than one point so that loops exist and the impedances in parallel paths results in the undesired distribution of power flow in the paths.
  • To Protect from thermal overload and to improve transmission system stability.
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