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Abstract

A three phase transformer apparatus for a three phase electrical power transformation system is provided. For each phase of the three phase transformer apparatus the three phase transformer apparatus comprises: an upper core limb having a first end and a second end, a lower core limb having a third end and a fourth end, a first coil assembly comprising a first primary coil and a first secondary coil, and a second coil assembly comprising a second secondary coil and a control coil. The first primary coil and the first secondary coil of each first coil assembly are wound concentrically around the upper core limb or the lower core limb of the respective phase. The second secondary coil and the control coil of each second coil assembly are wound concentrically around the other of the upper core limb and the lower core limb of the respective phase. The second secondary coil of each second coil assembly is connected in series to the first secondary coil of the first coil assembly of the respective phase. The three phase transformer apparatus further comprises a first yoke portion connected between each of the first ends of the upper core limbs, a second yoke portion connected between each of the fourth ends of the lower core limbs, and at least one transfer yoke portion, configured to allow magnetic flux to flow between the first end of each upper core limb and the second end of the respective upper core limb, and to allow magnetic flux to flow between the third end of each lower core limb and the fourth end of the respective lower core limb. A controller is connected to the control coil of each phase and configured to apply a voltage or current waveform to the control coil in order to influence the transfer of energy between the first primary coils and the first and second secondary coils of the three phase transformer apparatus.

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