(19)

(11)

EP 4 111 478 A1

(12)

(43) Date of publication: 04.01.2023 Bulletin 2023/01 (21) Application number: 20920995.6 (22) Date of filing: 28.02.2020

(51) International Patent Classification (IPC):  H01F 27/28(2006.01) (52) Cooperative Patent Classification (CPC): H01F 27/324; H01F 27/323; H01F 5/06 (86) International application number: PCT/CN2020/077173 (87) International publication number: WO 2021/168788 (02.09.2021 Gazette 2021/35)

(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: ZHANG, Chengqing District Datong, Shaanxi 037038 (CN) HAN, Lili District Datong, Shaanxi 037000 (CN) (74) Representative: Michalski Hüttermann & Partner Patentanwälte mbB  Kaistraße 16A 40221 Düsseldorf 40221 Düsseldorf (DE)