Wound electrical insulating products. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Wound electrical insulating products. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electricity for beginners

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Wound electrical insulating products are solid tubes and cylinders made by winding any fibrous materials on metal round rods, pre-impregnated with a binder.

As fibrous materials, special grades of winding or impregnating papers are used, as well as cotton fabrics and fiberglass. Binders are bakelite, epoxy, organosilicon and other resins.

The wound electrical insulating products, together with the metal rods on which they are wound, are dried at high temperature. For the purpose of hygroscopicity of the wound products, they are varnished. Each layer of varnish is dried in an oven.

Solid textolite rods can also be classified as wound products, because they are also obtained by winding blanks from a textile filler impregnated with bakelite varnish. After that, the blanks are subjected to hot pressing in steel molds.

Wound electrical insulating products are used in transformers with air and oil insulation, in air and oil circuit breakers, various electrical appliances and electrical equipment units.

Author: Smirnova L.N.

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