DDP greatly shortens the production cycle of transformer
- By : Insulation Materials
The rhombic coating on adhesive paper hardly solidifies at room temperature. When heated, the curing reaction proceeds rapidly, resulting in cured materials with good mechanical, electrical properties, heat resistance and oil resistance, which binds the adjacent parts into a whole.
1) Fiber fragility. When excessive heating separates moisture from the fibrous material, it accelerates the embrittlement of the fibrous material. Due to the brittleness and peeling of paper, electrical accidents may occur due to the impact of mechanical vibration, electric stress and operation wave.
2) The mechanical strength of fibre material decreases. The mechanical strength of fiber material decreases with the prolongation of heating time. When the moisture of insulation material is discharged again due to the heat of transformer, the value of insulation resistance may increase, but its mechanical strength will be greatly reduced. Insulating paper material will not be able to withstand the influence of mechanical forces such as short circuit current or impact load.
3) The shrinkage of the fibre material itself. The shrinkage of fibre material after embrittlement reduces the clamping force, which may cause shrinkage movement and damage insulation by shifting and friction of transformer windings under electromagnetic vibration or impulse voltage.
The application of dispensing paper greatly shortens the production cycle of transformer, saves a lot of energy and organic solvents, reduces the cost and reduces the harm to the environment. In addition, the transformer oil can penetrate into the inner part of the coil through the uncoated part because the coil does not need to be impregnated, thus forming an oil-paper composite insulation system with high insulation strength. The cooling effect is good and the temperature rise is low, which improves the reliability of the transformer operation.