(19)

(11)

EP 0 956 570 A1

(12)

(43) Date of publication: 17.11.1999 Bulletin 1999/46 (21) Application number: 98902375.0 (22) Date of filing: 02.02.1998

(51) International Patent Classification (IPC):  H01F 27/ 34( . ) H01F 27/ 30( . ) H01F 27/ 28( . ) (86) International application number: PCT/SE1998/000178 (87) International publication number: WO 1998/034248 (06.08.1998 Gazette 1998/31)

(84) Designated Contracting States: AT CH DE DK ES FI FR GB IT LI SE (30) Priority: 03.02.1997 SE 19970000340 28.11.1997 SE 19970004436 (71) Applicant: ABB AB 721 83 Västeras (SE)	(72) Inventors: SASSE, Christian S-724 64 Västeras (SE) BERGGREN, Sören S-724 62 Västeras (SE) KYLANDER, Gunnar S-723 43 Västeras (SE) CARSTENSEN, Peter S-141 42 Huddinge (SE) JOHANSSON, Kjell S-722 46 Väster s (SE) (74) Representative: Hopfgarten, Nils, et al  L.A. Groth & Co. KB P.O. Box 6107 102 32 Stockholm 102 32 Stockholm (SE)