Electrical power transformation system and process

A transformer apparatus for an electrical power transformation system comprising:

• three outer transformer limbs, each transformer limb comprising:
• an electromagnetic core;
• a first coil assembly comprising a first primary coil and a first secondary coil, the first primary coil and the first secondary coil wound concentrically around the electromagnetic core;
• a second coil assembly comprising a second primary coil and a second secondary coil, the second primary coil and the second secondary coil wound concentrically around the electromagnetic core;
• wherein the first coil assembly and the second coil assembly are spaced apart along the electromagnetic core,
• each first primary coil is connected in series to the second primary coil of the respective transformer limb, and
• each first secondary coil is connected in series to the second secondary coil of the respective transformer limb;
• an inner transformer limb comprising an electromagnetic core, wherein the outer transformer limbs are arranged about the inner transformer limb;
• a transfer star comprising:
• an electromagnetic transfer core extending from the inner transformer limb to each of the three outer transformer limbs at a point on each outer transformer limb between the first coil assembly and the second coil assembly;
• three transfer coils, the transfer coils wound around the electromagnetic transfer core such that each transfer coil is arranged between the inner transformer limb and a respective outer transformer limb,
• wherein the transfer star is configured to allow transfer of magnetomotive force between the outer transformer limbs and the inner transformer limb of the transformer apparatus;
• a first connecting portion provided towards a first end of each outer transformer limb and towards a first end of the inner transformer limb, the first connecting portion connecting each of the first ends of the outer transformer limbs and the first end of the inner transformer limb together and configured to allow magnetic flux to flow between each of the first ends of the inner and outer transformer limbs;
• and
• a second connecting portion provided towards a second opposing end of each outer transformer limb and towards a second opposing end of the inner transformer limb, the second connecting portion connecting each of the second ends of the outer transformer limbs and the second end of the inner transformer limb together and configured to allow magnetic flux to flow between each of the second ends of the inner and outer transformer limbs.