(19)

(11)

EP 2 443 733 A1

(12)

(43) Date of publication: 25.04.2012 Bulletin 2012/17 (21) Application number: 09779756.7 (22) Date of filing: 15.06.2009

(51) International Patent Classification (IPC):  H02M 7/483(2007.01) (86) International application number: PCT/EP2009/057381 (87) International publication number: WO 2010/145688 (23.12.2010 Gazette 2010/51)

(84) Designated Contracting States: 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 SE SI SK TR (71) Applicant: Alstom Grid UK Limited Staffordshire ST17 4LX (GB)	(72) Inventors: KEITLEY, Adrian ST17 9QX (GB) WITHANAGE, Ruchira ST17 4ND (GB) WHITEHOUSE, Robert ST17 4NR (GB) TRAINER, David DE24 0AG (GB) (74) Representative: Ilgart, Jean-Christophe  BREVALEX 95 rue d'Amsterdam 75378 Paris Cedex 8 75378 Paris Cedex 8 (FR)