US 12,456,573 B2
Transformer having a tertiary winding
Erik Carl Wedin, Karlstad (SE); Mattias Viksten, Hudiksvall (SE); and Peter Astrand, Bälinge (SE)
Assigned to HITACHI ENERGY LTD, Zurich (CH)
Appl. No. 18/834,311
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Jun. 8, 2023, PCT No. PCT/EP2023/065417
§ 371(c)(1), (2) Date Jul. 30, 2024,
PCT Pub. No. WO2023/237700, PCT Pub. Date Dec. 14, 2023.
Claims priority of application No. 22177915 (EP), filed on Jun. 8, 2022.
Prior Publication US 2024/0420885 A1, Dec. 19, 2024
Int. Cl. H01F 27/38 (2006.01); H01F 30/10 (2006.01); H01F 30/12 (2006.01)
CPC H01F 27/38 (2013.01) [H01F 30/10 (2013.01); H01F 30/12 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A transformer, comprising:
a single-phase core comprising:
a plurality of wound limbs;
primary and secondary concentric windings formed on each limb of the plurality of wound limbs; and
a tertiary concentric winding concentric with the primary and secondary windings, formed on at least one limb of the plurality of wound limbs such that fewer than all limbs of the plurality of wound limbs have the tertiary winding, wherein the tertiary concentric winding provides balancing and/or auxiliary power, wherein the tertiary concentric winding is unconnected mechanically to any winding formed on any of the plurality of wound limbs distinct from the at least one limb, and wherein the tertiary concentric winding is positioned radially outermost relative to the primary and secondary concentric windings formed on the at least one limb, wherein the tertiary concentric winding formed on the at least one limb of the plurality of wound limbs is a lower-voltage winding than the primary and secondary windings.