(19)

(11)

EP 4 010 911 A1

(12)

(43) Date of publication: 15.06.2022 Bulletin 2022/24 (21) Application number: 19940317.1 (22) Date of filing: 07.08.2019

(51) International Patent Classification (IPC):  H01F 27/08(2006.01) (52) Cooperative Patent Classification (CPC): H01F 27/085 (86) International application number: PCT/CN2019/099578 (87) International publication number: WO 2021/022507 (11.02.2021 Gazette 2021/06)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: Hitachi Energy Switzerland AG 5400 Baden (CH)	(72) Inventors: XU, Ye Shanghai 200135 (CN) SUN, Qingjun Shanghai 200120 (CN) (74) Representative: Vossius & Partner Patentanwälte Rechtsanwälte mbB  Siebertstraße 3 81675 München 81675 München (DE)