How to insulate transformer windings?

The winding of a transformer is kept insulated by using insulating materials such as insulation paper, pressboard, and enamel-coated wire. These materials are selected for their ability to withstand the electrical and thermal stresses that are present in transformers.

In a transformer, the winding consists of a coil of insulated wire that is wound around a core made of laminated magnetic material. The insulating materials used in the winding help to prevent electrical breakdown between the individual turns of wire, which would cause a short circuit and potentially damage the transformer.

Insulation paper is typically used to separate the individual turns of wire in the winding and prevent them from touching each other. The paper is made from a material such as cellulose, which is impregnated with a dielectric fluid to improve its insulation properties. The paper is also designed to be resistant to heat and moisture, which can degrade the insulation over time.

Pressboard is another type of insulating material that is used in transformers. It is a composite material made from layers of paper that are bonded together under high pressure and temperature. Pressboard is used to provide additional insulation between the winding and the transformer core, as well as to form barriers between different sections of the winding.

Enamel-coated wire is also used in transformers as it has a high electrical insulation property. The wire is coated with a thin layer of insulating enamel that helps to prevent electrical breakdown between the individual turns of wire.

Overall, the use of high-quality insulating materials and careful design is essential to ensure the safe and reliable operation of transformers.

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