manufactured · input
Thermally upgraded kraft (TUK) paper and pressboard are the primary solid insulation in oil-filled power transformers. Cellulose fibers provide electrical insulation between windings and structural support for the transformer's active parts. Thermally upgraded paper (treated with nitrogen stabilizers) operates continuously at 130°C vs standard 105°C — extending transformer life to 40+ years. Weidmann Electrical Technology is the dominant global supplier (~45% market share); competitors include ABB (some internal), SMIT Transformers, and smaller regional suppliers. Pressboard cylinders, angle rings, and sectors form complex 3D insulation structures designed to field-grade specifications. Critical: if insulation quality is compromised, transformer flashover and catastrophic failure follows.
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Who makes it
1 company produce transformer insulation paper & pressboard (kraft).
Rapperswil-Jona, Switzerland-based company and the world's largest dedicated transformer insulation specialist. Produces thermally upgraded kraft paper, pressboard cylinders, angle rings, and complete insulation systems for LPTs. Wholly-owned by the Weidmann family since 1877. Supplies all major transformer OEMs globally; considered the de facto standards setter for transformer insulation design.
