Corona shielding strip for a high-voltage rotating electrical machine

US12374950B2 · kind B2 · utility

Assignee

• INNOMOTICS GMBH · DE

Inventors

• Jürgen Huber · Erlangen, DE
• Dieter Schirm
• Matthias Übler · Ursensollen, DE
• Steffen Lang · Hallerndorf, DE
• Torsten Rossow · Berlin, DE
• Michael Nagel · Tempe, US

Key dates

• Filing date: Nov 2, 2021
• Grant date: Jul 29, 2025
• Expiry date: Nov 2, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J2463/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Various embodiments of the teachings herein include a corona shielding tape for further processing to give an insulation system comprising an impregnated winding with potential control via outer corona shielding “AGS” and/or internal potential controller “IPS” and/or terminal corona shielding “EGS”, the insulation system being producible by impregnating the winding with an anhydride-free and resin-based impregnating agent at 45-85° C. and under reduced pressure. The corona shielding tape may include: a carrier tape; an electrically conductive and/or partly conductive filler in a polymer matrix; and a tape accelerator suitable for curing and/or gelation of the impregnating agent. The polymer matrix contains at least one polyvinylalcohol and/or a polyvinylalcohol copolymer. The accelerator is selected from the group consisting of: superacids and superacid salts suitable for acceleration of a cationic homopolymerization of the resin-based anhydride-free impregnating agent.