Method of manufacturing transformer windings embedded in casting resin

US4540536A · kind A · utility

Assignee

• Transformatoren Union Aktiengesellschaft · DE

Inventors

• Gerhard Altmann · Tauberbischofsheim, DE
• Wolfgang Bendel · Leonberg, DE
• Rudolf Dedelmahr · Neckartenzlingen, DE
• Richard Pfeiffer · Bigfork, US

Key dates

• Filing date: Sep 13, 1983
• Grant date: Sep 10, 1985
• Expiry date: Sep 13, 2003

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F41/127
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Method of manufacturing a transformer winding embedded in casting resin by winding coils respectively by themselves and independently of one another for disposition thereof in tandem in axial direction of the winding includes placing the wound coils in a substantially annular casting mold having an inner and an outer jacket, with respective impregnated corrugated mats of insulating material as spacers disposed between the inner jacket and the coils as well as between the coils and the outer jacket, the inner and the outer jackets being fixed between mold end walls at respective ends of the casting mold; and disposing the casting mold containing the wound coils in an evacuated chamber and pouring casting resin into the casting mold through an axially parallel slot formed in the outer jacket thereof. Additionally included are spreading the inner jacket in radial direction so as to permanently deform the inner spacer to a dimension at which the radial extent of the inner spacer is reduced, the inner jacket being formed with axially parallel edges at ends thereof overlapping in circumferential direction and slidable on one another during the deformation so as to spread the inner jacket…