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Transformer insulation material

  Insulation material is one of the most important materials in the transformer, its performance and quality directly affect the reliability of transformer operation and transformer life. In recent years, the transformer products used in new insulation materials after another. With the rapid development of science and technology, electrical appliances, transformers and other electrical equipment is increasingly widely used. The reliability and service life of the transformer is largely dependent on the insulation material it uses. Insulation materials are increasingly engaged in the design and manufacture of transformers. Over the past two decades, transformers insulation materials aspects of new products, new technologies, new theories continue to emerge and development, so that the transformer insulation materials and its application has formed a very important discipline.

  Insulation Materials

  Insulation material, also known as dielectric, is a high resistivity, low conductivity of the material. Insulation material can be used to isolate live or different potential of the conductor, so that the current flow in a certain direction. In the transformer products, insulation materials also play a cooling, cooling, support, fixed, arc, improve the potential gradient, moisture, mildew and protect the role of the conductor. (105 ≧), B (130 ≧), F (155 ≧), H (180 ≧), C (greater than 180), the temperature of the insulation materials are classified according to the voltage grade: C). Transformer insulation material heat resistance grade refers to the insulation material in the transformer to allow the maximum temperature. If the correct use of insulating materials, you can guarantee the material 20 years of service life. Otherwise it will be based on 8 ≧ law (A-class insulation temperature for each 8 ≧ rise, half life cycle, B-class insulation is 10 ≧, H level is 12 ≧. This law is known as heat aging 8 ≧ law) Service life. The heat resistance of the insulating material composed of the polymer is lower than that of the inorganic dielectric.

  Transformer Insulation Material Variety

  The properties of insulating materials are closely related to their molecular composition and molecular structure. Transformer insulation materials a lot of varieties, according to their form can be divided into gas insulation materials, liquid insulation materials and solid insulation materials.

  Transformer solid insulation material type

  Solid insulation material: Transformer used in solid insulation material refers to the material itself is solid or through the chemical reaction, the physical changes in solid insulation material. Transformer solid insulation materials, such as insulating paper, insulating paperboard, Nomex paper, plastic tape, electrical laminated wood, epoxy glass cloth plate, low dielectric loss laminate, insulation paint, insulation glue, cotton belt, Mesh-free polyester tape and so on.

  1 Insulating paper: The insulating paper described here refers to pure sulphate wood pulp paper, and other insulating paper includes synthetic fiber paper (such as NOMEX paper), nitrile insulating paper (such as Dennison paper) and so on.

  2 Insulated crepe paper: made of electrician with insulating paper by creping. Wrinkles in the transverse direction, wrinkles are pulled when stretched. Due to the different wrinkle processing procedures, wrinkled paper with different elongation can be made. Insulating paper thickness is generally 0.05mm ~ 0.12mm, elongation range of 5% to 200%. Insulated crepe paper is often used in oil-immersed transformers, such as windings.

  3 Dennison paper: change the insulation paper has become nitrile paper, which in the manufacturing process, in the pulp by adding di-nitrile, vinyl cyanide and so on. Produced by the United States Dennison company, is characterized by the paper wrinkled, after calendering, with good mechanical cyanide and the appropriate elongation, is a large transformer winding turns of the ideal material, with it bandage transposition wire can guarantee Tight and will not appear swell phenomenon.

  4 Nomex paper: is made by the United States DuPont heat-resistant synthetic fiber paper. Nomex is the trade name of this fibrous paper. Nomex's main ingredient is aromatic polyamide, with good thermal aging. Can be used at 220 ≧ for a long time, belonging to the C-class insulation material.

  5 on the adhesive tape: can be divided into single-sided adhesive tape, double-sided adhesive tape and Lingge three kinds of adhesive tape. Adhesive paper type with 0.07mm coiled paper coated with phenolic resin or epoxy resin after baking drying made.

  6 metal paper: for the screen and electrostatic screen. Its bottom paper is 0.2mm thick insulation paper, aluminum foil thickness of 0.02mm lead and insulation screen insulation dressing.

  7 Insulated cardboard: made of paper by sulphate wood pulp. It is used for the cake gap of the gap, partitions, cardboard tube, corrugated paper, iron yoke insulation, folder insulation and insulation winding insulation board.

  8 Insulation tube: Transformer used in the insulation tube with phenolic adhesive paper tube, epoxy glass cloth tube, glass tube and cardboard tube.

  9 corrugated cardboard: high-voltage transformer multi-layer paper tube composed of oil plate gap structure, the corrugated cardboard can be used instead of retaining the formation of oil gap. This insulation structure can save insulation on the basis of insulation properties.

  10 electrical laminate: from paper, cloth and wood veneer to do the substrate, dip coated with different adhesives, hot or roll made of layered structure of the insulating material.

  13 electrical thin and electrical composite materials: with excellent dielectric properties, all belong to the sheet insulation material. The electrical film has a polypropylene film, a polyester film and a polyimide film. The composite material is a composite product made of one or both sides of the film.

  14 glass cloth: glass cloth is used for electrician non-alkali glass cloth impregnated with insulating paint, made by baking. For dry-type transformers.

  15 Transformer banding with insulating material: Transformer banding with insulating material with cotton belt, tightening belt, semi-dry thin line, mesh semi-dry without latitude, glass cloth and polyester rope.

  11 Nomex Cardboard: A cardboard made of synthetic material based on aromatic amide fibers.

  12 pull rods: dry-type transformers core column of the interstage bar, air gap stays, screws and screws are often used glass wire rod.

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