Electrical laminated wood introduction and processing technic

Electrical laminated wood is a kind of insulating and supporting material widely used in transformers and mutual inductors. It has the advantages of moderate specific gravity, high mechanical strength, easy vacuum drying and easy machining. Its d……

Electrical laminated wood is a kind of insulating and supporting material widely used in transformers and mutual inductors. It has the advantages of moderate specific gravity, high mechanical strength, easy vacuum drying and easy machining. Its dielectric constant is close to that of transformer oil, and its insulation is reasonable. It can be used for a long time in transformer oil of 105 °C. Electrical laminated wood boards have been widely used in oil-immersed transformers to manufacture upper and lower pressure plates, lead supports, iron yoke pads and other parts. They are used to make clamps in mutual inductors, which replace steel plates, insulating paperboards, epoxy paperboards and epoxy glass cloth laminates, thereby reducing the transformer’s own weight and material costs. The electrical laminated wood board is made of high-quality birch wood, which is boiled, rotary-cut and dried, then it is coated with special insulating rubber on the condition of high temperature and high pressure. Qualified substrates – one soak – two times soak – rotary cutting – veneer drying – veneer shearing and repair – gluing and preforming – pre-pressing – hot pressing. (Using low-media adhesive, several layers of veneers, each layer of veneer is 1.2-2.2mm thick, criss-crossed by wood grain, crisscross, parallel parison, high pressure pressing.)

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Insulation materials commonly used are classified into inorganic insulating materials, organic insulating materials and mixed insulating materials according to their chemical properties. Commonly used inorganic insulating materials are: mica, asbestos, marble, porcelain, glass, sulfur, etc., mainly used as winding insulation for motors and electrical appliances, bottom plates and insulators for switches. Organic insulating materials are: shellac, resin, rubber, cotton yarn, paper, hemp, rayon, etc., mostly used to make insulating varnish, coated insulation of winding wires, etc. The hybrid insulating material is a variety of molded insulating materials which are processed by the above two materials, and are used as a base, an outer casing, and the like of an electric appliance.

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Contact Us: serina@ztaero.com

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