Diamond Dotted Paper A Class DDP Electrical Insulation Paper for Oil Immersed Transformer
Diamond Dotted Paper (DDP), a specialized insulating material for transformers, features a unique epoxy diamond dot coating on electrical Insulation paper substrates. It integrates excellent electrical insulation performance, high heat resistance and reliable adhesive bonding—its epoxy dots cure upon heating to firmly bond transformer windings, core and laminated components into an integrated structure.
Widely applied in oil-immersed and dry-type transformers, DDP not only effectively isolates different transformer parts to prevent short circuits and electrical breakdowns, but also enhances mechanical strength and anti-vibration, anti-deformation capabilities of the transformer winding system. Meanwhile, its diamond-patterned design facilitates air release and impregnating medium flow during manufacturing, ensuring stable lamination without delamination. As a core material for transformer insulation and structural bonding, DDP is critical to improving the operational safety, reliability and service life of transformers.
1. Provides reliable inter-turn and inter-layer insulation for transformer high/low voltage windings to avoid electrical short circuits.
2. Bonds winding laminations, cores and insulating components into a solid integral structure via thermosetting epoxy dots.
3. Serves as insulation and bonding material for transformer lead terminals and core clamps to ensure electrical isolation and structural stability.
4. Facilitates air exhaust and impregnating medium (oil/resin) penetration in transformer manufacturing processes, preventing delamination of winding structures.
5. Enhances the mechanical strength and anti-vibration, anti-deformation performance of transformer winding systems during long-term operation.
6. Acts as a core insulation barrier between transformer iron core and windings to isolate the core from conductive parts and reduce eddy current loss.
