What is the name of the insulating material used on a transformer's primary winding?

The insulation materials commonly used in transformer primary winding are as follows:

Enamel wire insulating paint

Enamelled wire is made by coating conductors such as copper wire with a layer of insulating paint. This insulating paint usually has good electrical insulation properties, heat resistance and chemical corrosion resistance. It can effectively isolate the conductor of the primary winding from other parts, preventing short circuit and leakage. For example, polyurethane wire insulating paint, with good wear resistance and solvent resistance, is suitable for transformer windings in various working environments.

Insulating paper

Usually used are cable paper, wrinkle paper and so on. Insulating paper has high mechanical strength and electrical insulation properties, and can be used for interlayer insulation and ground insulation of windings. For example, in transformer windings, cable paper is often used to wrap conductors to increase insulation strength and prevent partial discharge. Corrugated paper, because of its good flexibility and compressibility, is often used to fill the gap between the windings and play a fixed and insulating role.

Insulating film

Such as polyester film, polyimide film and so on. These films have extremely thin thickness and excellent insulation properties, and can be used for interturn insulation of winding. Polyester film has good temperature resistance and mechanical properties, and is widely used in transformers of lower voltage levels. Polyimide film has higher heat resistance and electrical strength, suitable for high temperature, high voltage transformer environment.

Insulating paint

In addition to the enamelled wire, the entire winding of the transformer may also be impregnated with insulating paint after winding. This insulating paint can penetrate into all parts of the winding, enhance the insulation performance, and also play a fixed winding, moisture-proof, mildew proof and other functions. For example, epoxy resin insulating paint has good adhesion and corrosion resistance, and can provide reliable insulation protection for transformer windings.