US 12,381,032 B2
Zero-sequence blocking transformer
Ponggorn Kulsangcharoen, Solihull (GB); and Rodrigo Fernandez-Mattos, Solihull (GB)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Sep. 14, 2022, as Appl. No. 17/944,327.
Claims priority of application No. 21196711 (EP), filed on Sep. 14, 2021.
Prior Publication US 2023/0085386 A1, Mar. 16, 2023
Int. Cl. H01F 27/30 (2006.01); H01F 27/26 (2006.01); H02M 7/08 (2006.01)
CPC H01F 27/306 (2013.01) [H01F 27/263 (2013.01); H02M 7/08 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A zero-sequence blocking transformer comprising:
a single core defining a closed magnetic path around which at least six windings are wound, the single core having:
a first core part;
a first pair of the four windings wound around the first core part;
a second core part;
a second pair of the four windings wound around the second core part, the first core and the second core;
a third core part;
a third pair of windings wound around the third core part;
wherein the first, second and third core parts combine to form the single core; and
wherein the single core further include leakage core part connected in parallel with the first, second and third core parts and around which no windings are wound.