The enamelled wire, also known as the magnet wire or winding wire, is a type of wire used in transformers. It is made by coating a thin layer of insulation material, such as enamelled or polyurethane, over a conductive wire. This insulation coating provides electrical insulation and protection to prevent short circuits.
Technological parameters of enamelled wire include:
1. Conductor Material: The core wire is typically made of copper or aluminum due to their excellent conductivity properties.
2. Insulation Material: The insulation coating is usually made of enamelled or polyurethane, which provides high electrical resistance and thermal stability.
3. Wire Diameter: enamelled wires are available in various diameters, ranging from very thin wires used in small transformers to thicker wires for larger power transformers.
4. Temperature Rating: The enamelled wire is designed to withstand high temperatures generated during transformer operation. It is rated based on its ability to operate at a specific temperature without deteriorating the insulation.
5. Voltage Rating: enamelled wires have different voltage ratings depending on their intended application. Higher voltage ratings are required for transformers used in power distribution systems.
6. Thermal Class: The thermal class indicates the maximum allowed operating temperature of the wire. It is denoted by a letter, such as F (155°C), H (180°C), or C (220°C), representing different levels of temperature resistance.
7. Flexibility: enamelled wires can be solid or stranded. Stranded wires offer more flexibility, making them suitable for applications that require frequent bending or movement.
These parameters ensure that the enamelled wire meets the electrical and thermal requirements of transformers, ensuring their efficient and reliable operation.