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EP 4 740 230 A1

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(43) Date of publication: 13.05.2026 Bulletin 2026/20 (21) Application number: 24737130.5 (22) Date of filing: 04.07.2024

(51) International Patent Classification (IPC):  H01F 27/08(2006.01) H01F 27/32(2006.01) H01F 27/28(2006.01) (52) Cooperative Patent Classification (CPC): H01F 27/2876; H01F 27/085; H01F 2027/328 (86) International application number: PCT/EP2024/068952 (87) International publication number: WO 2025/008492 (09.01.2025 Gazette 2025/02)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 04.07.2023 EP 23382690 (71) Applicant: Hitachi Energy Ltd 8050 Zürich (CH)

(72) Inventors: DE LA VEGA-HAZAS ALVAREZ-BARON, Alfredo 39005 Santander (ES) NOGUES BARRIERAS, Antonio 50018 Zaragoza (ES) ROY MARTIN, Carlos Manuel 50006 Zaragoza (ES) CEBRIAN LLES, Lorena 50012 Zaragoza (ES) MAORAD VIDEGAIN, Juan 50012 Zaragoza (ES) MURILLO JASO, Rafael 50004 Zaragoza (ES) MUNOZ ARRIBAS, Fernando 50012 Zaragoza (ES) MURGIDA, Vito 6997 Sessa (CH) DIAZ MEZA, Dario Martin 50014 Zaragoza (ES) (74) Representative: Vossius & Partner Patentanwälte Rechtsanwälte mbB  Siebertstraße 3 81675 München 81675 München (DE)