Transformer Insulation Materials
Standards: IEC 60893, IEC 60641, IEC 60763
Pressboard, laminated wood, DDP/DPE, aramid and paper for lead exits, barriers, end rings, and winding insulation.
Pressboard (Transformerboard)
High-density cellulose board — barriers, cylinders, angle rings.
Diamond Dotted Paper (DDP)
Epoxy-dotted kraft paper bonding layer insulation.
Crepe Paper & Tubes
Conformable covering for leads and connections.
Spacers, Wedges & Cylinders
Machined pressboard forming cooling ducts and coil support.
Nomex® / Aramid Papers
High-temperature insulation for dry-type and hybrid systems.
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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