ASTM DIN Transformers Dia 0.1mm Enamel Coated Wire

Dia 0.1 - 10 Mm Enamel Coated Wire Copper Aluminium Stainless Steel Conductor

Enamelled wire is copper wire with a thin layer of insulation, and is used in a variety of applications including transformers, wound coils, motors, solenoids, and instruments. Raw copper is drawn to meet specific size requirements based on the National Electrical Manufacturer's Association (NEMA) standards. This magnet wire meets the NEMA MW-35-C standard for operating temperature (200°C/392°F) and insulation makeup. The insulation is made from modified Polyester with a Polyamideimide overcoat, and protects the coiled wire from short-circuiting. The high temperature properties of this wire make it suitable for severe thermal overload applications.

Wire Type: Enameled Copper/ Aluminium/ Stainless Steel Wire

Diameter: 0.1-10 mm

Color: Natural or customized

Insulation: Polyester w/ Polyamideimide Overcoat

NEMA Description: MW-35-C

Build: Heavy Min-Nom

Temperature Rating: as custom demanded

Example Specifocation:

Application in Transformer

A transformer is a device that transfers electrical energy from one circuit to another through its coils (windings). The properties needed for motor windings are similar to those needed for transformers, but with the additional requirement to withstand mechanical vibration and centrifugal forces at operating temperatures.

Transformer windings are normally made from copper but aluminium is a suitable competitor where weight and first cost are decisive factors.

In North America, aluminium is the predominant choice of winding material for low-voltage, dry-type transformers larger than 15 kilovolt-amperes (kVA). In most other areas of the world, copper is the predominant winding material. Purchasing decisions are generally a function of loss valuations expressed in currency per kilowatt.

Copper used for the manufacture of transformer windings is in the form of wire for small products and strip for larger equipment. For small products, the wire must be strong enough to be wound without breakage, yet flexible enough to provide close-packed windings. Strip products must be of good surface quality so that insulating enamels do not break down under voltage. Good ductility is essential for the strip to be formed and packed while good strength is needed to withstand the high electro-mechanical stresses set up under occasional short-circuit conditions. Copper winding wires in transformers are compatible with all modern insulation materials, such as lacquer and enamel. Lacquers permit the close spacing of windings to give best efficiency in the coils.

A major engineering reason to choose copper windings over aluminium is space considerations. This is because a copper-wound transformer can be made smaller than aluminium transformers. To obtain equal ratings in aluminium transformers, a 66% larger cross-sectional area is required than for copper conductors. However, the use of larger-sized conductors results in aluminium winding strength nearly equivalent to copper windings.

Connectivity is another important benefit of copper-wound transformers. Cleaning and brushing with a quality joint compound to prevent oxidation is not necessary with copper.

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