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Diamond Paper Pre-preg - carta diamantata DPP

Erbaisolanti » Products » Electric insulation » Presspan Rolls and Sheets » Diamond Paper Pre-preg - carta...

APPLICATIONS
The trend towards continually greater power and voltage ratings necessary led to corresponding greater dielectric and mechanical stress in the active part of oil-filled power transformers and measuring transformers. As the solution for this problem, insulation materials with diamond-pattern resin coating were developed to cope with these forces. The partial resin coating mechanically strengthens the coil on the one hand and ensures dependable exchange between the solid and liquid medium on the other hand.

DESCRIPTION
P3055D is manufactured with transformer presspaper PSP 3055 with thickness ranging from 0,06 to 0,50 mm as base material. Using a special printing process, we coat this proven insulation material on both sides with a diamond- pattern partial epoxy resin layer.
The coating squares of P3055D have a side length of 9,5 mm and a separation of 6,35 mm. This means that approximately 36% of the total area of each side is print-coated with epoxy resin. The squares are arranged such that their diagonals lie parallel and at right angles to the machine run direction of the transformer presspaper. The thickness of the resin coating is indipendent of the base material thickness and has a value of 0,020 mm on each side with ? 0,010 mm tolerance. A characteristic feature is that the epoxy resin is still in the reactive B-state. On raising the temperature to 110°C to 130°C, the re-meltable low molecular resin softens and becames sticky again, so that it becomes firmly bonded to the electrical conductor. The high molecular non-melting C-state is reached after elapse of the curing time. The insulation is then in the stable duroplastic condition. A nonmelting linkage has been produced which cannot be attacked by the liquid insulation media.

ADVANTAGES
• Special insulation material for transformers with high power and voltage ratings.
• Internal strengthening of the coil.
• Axial and radial mechanical forces safely tolerated.
• Complete medium exchange.

PROCESSING
P3055D is dry and non-sticky in the state as delivered. It can be processed as layer insulation by the customary methods. When making narrow reels (on reel cutting machines), it is essential to make sure that the cut edges are in perfect condition, because edges which are not clean cut can lead to breakage in the course of the winding process.

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