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(11)

EP 2 987 171 A1

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(43) Date of publication: 24.02.2016 Bulletin 2016/08 (21) Application number: 14717149.0 (22) Date of filing: 14.04.2014

(51) International Patent Classification (IPC):  H01B 3/20(2006.01) H01B 7/288(2006.01) H02P 13/06(2006.01) B01D 15/00(2006.01) H01F 27/23(2006.01) (86) International application number: PCT/EP2014/057514 (87) International publication number: WO 2014/170263 (23.10.2014 Gazette 2014/43)

(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 (30) Priority: 17.04.2013 EP 13164089 (71) Applicant: ABB Technology Ltd. 8050 Zürich (CH)	(72) Inventors: LARSSON, Tommy S-771 90 Ludvika (SE) ANDERSSON, Gunnar S-770 14 Nyhammar (SE) STENESTAM, Bengt-Olof S-771 42 Ludvika (SE) SUNDQVIST, Pontus S-784 50 Borlänge (SE) (74) Representative: Savela, Reino Aleksi  ABB AB Intellectual Property Ingenjör Bååths Gata 11 721 83 Västerås 721 83 Västerås (SE)