The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 2010
Filed:
Aug. 17, 2007
Erik Forsberg, Smedjebacken, SE;
Tony Polander, Söderbärke, SE;
Lars-åke Svensson, Ludvika, SE;
Lars-erik Vennerberg, Ludvika, SE;
Erik Forsberg, Smedjebacken, SE;
Tony Polander, Söderbärke, SE;
Lars-Åke Svensson, Ludvika, SE;
Lars-Erik Vennerberg, Ludvika, SE;
ABB Technology Ltd., Zürich, CH;
Abstract
A high voltage transformer including a transformer housing. Internal components and provided in the transformer housing. The internal components are submerged in transformer oil and are provided with insulation for insulating a high voltage winding end. The insulation includes a shield ring arranged above the winding end and a pressboard structure formed in a zigzag pattern arranged around the winding end. The shield ring includes a core covered with a conducting layer and a continuous solid insulation layer outside the conducting layer. The insulation layer includes integrated solid insulation sections of which at least some among themselves having varying thickness. Also a shield ring and a method of manufacture the shield ring.