Diamond dotted paper insulation paper, abbreviated as DDP, is a kind of insulation material made of cable paper as the backing material and coated with special modified epoxy resin in rhombus shape on cable paper.
Diamond dotted paper, abbreviated as DDP, is a kind of insulation material made of cable paper as the backing material and coated with special modified epoxy resin in rhombus shape on cable paper.
Diamond dotted paper is widely used in the inter-layer insulation and inter-turn insulation of oil-immersed power transformers. When used, the coating layer begins to melt at a certain temperature in the drying process of the coil, resulting in adhesion, and begins to solidify with the rise of temperature, so that the adjacent layers of the winding can be reliably bonded into a fixed unit. The bonding strength of epoxy resin is sufficient to prevent the displacement of each winding layer during short circuit, thus ensuring the long electrical and mechanical properties of the insulating structure.
Features of diamond dotted paper: It makes the coil have good ability to resist axial short circuit stress; Improve the shock resistance of the coil to heat and force, and it is conducive to the life and reliability of the transformer;
Application of transformer insulation paper diamond dotted paper: It is suitable for inter-turn insulation of oil-immersed power transformers and inter-layer insulation of distribution transformers.
Because the resin coating of the insulation paper diamond dotted paper is dotted, and it ensures the oil immersion and gas discharge, effectively avoid corona and local discharge, so as to ensure the safety and reliability of the insulation structure. Diamond dotted paper can also be used as cable shielding layer and electrical anti-corona material.
