Transformer Insulation Materials
Standards: IEC 60893, IEC 60641, IEC 60763, IEC 61061
Pressboard, laminated wood, DDP/DPE, aramid and paper for lead exits, barriers, end rings, and winding insulation.
Pressboard (Transformerboard)
High-density cellulose board (IEC 60641-3-1 Type B.3.1) — barriers, cylinders, angle rings, snouts.
Diamond Dotted Paper (DDP)
Epoxy-dotted kraft paper bonding layer insulation for short-circuit strength.
Crepe Paper & Tubes
Conformable insulation for leads, cable take-offs, and winding connections.
Laminated Densified Wood
IEC 61061 densified beechwood clamping beams, rings, and pressure plates.
Spacers, Wedges & Cylinders
Machined pressboard forming radial cooling ducts and winding support.
Nomex® / Aramid Papers
High-temperature thermal class H/C (180°C–220°C) aramid insulation.
Frequently asked
Transformerboard is the general term for electrical insulation board made of pure kraft pulp; pressboard is a higher-density, highly compressed, calendered form used for barriers and structural insulation.
A thin kraft paper coated with a thermosetting resin applied in a diamond pattern and partially cured; it bonds layers on heating and is used for interlayer/interturn insulation.
By density, thickness and finish, chosen for the dielectric stress and mechanical duty, and they must be compatible with the insulating fluid and contaminant-free.
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