US 12,488,927 B2
Reinforced transformer core frame and manufacturing method
Lukasz Michalski, Lodz (PL); Pawel Klys, Lodz (PL); Robert Daszkiewicz, Lodz (PL); and Adam Stelmasiak, Lodz (PL)
Assigned to HITACHI ENERGY LTD, Zürich (CH)
Filed by HITACHI ENERGY LTD, Zürich (CH)
Filed on Feb. 18, 2021, as Appl. No. 17/178,407.
Claims priority of application No. 20173263 (EP), filed on May 6, 2020.
Prior Publication US 2021/0350967 A1, Nov. 11, 2021
Int. Cl. H01F 27/24 (2006.01); H01F 27/06 (2006.01); H01F 27/32 (2006.01)
CPC H01F 27/06 (2013.01) [H01F 27/24 (2013.01); H01F 27/327 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A reinforced transformer core frame, comprising:
a transformer core frame; and
a reinforcement structure, the reinforcement structure comprising at least one reinforcement panel comprising a honeycomb structure and affixed to the transformer core frame, wherein the honeycomb structure has walls that define a plurality of cells, each of the walls including at least one fluid-communication opening that places the cells in fluid communication with neighboring cells and with an exterior volume of a liquid so that, when the reinforced transformer core frame is immersed in the liquid, the liquid passively floods the cells and any trapped gas vents from the cells without use of a pump.