Enameled Transposed Copper Conductor Wire

Transposed conductor refers to a type of winding wire composed of a certain number of Enameled Copper Flat Wires arranged into two columns with their wide surfaces in contact. The two columns of enameled wires are transposed in the same direction along their narrow surfaces above and below as required, and then tightly wrapped with multiple layers of electrical insulating paper tape continuously.

When the current flowing through the transformer winding is larger, or the winding loss is required to be lower, the use of combined conductors faces insurmountable difficulties in winding structure, arrangement, and winding process. Therefore, there is a need for a winding wire with a large total cross-sectional area, while minimizing eddy currents in the longitudinal and transverse leakage magnetic fields and unbalanced currents between wires. Transposed conductor is an ideal winding wire that meets the above requirements. It consists of a certain number (usually 7-59, up to 83) of enameled flat wires arranged into two columns with wide surfaces in contact. The two columns are transposed in the same direction along the narrow surfaces above and below as required, and tightly wrapped with multiple layers of electrical insulating paper tape continuously. Short circuits between the enameled flat wires inside the transposed conductor are not allowed. According to the mechanical strength requirements of transposed conductors under various operating conditions, the copper material of each enameled flat wire in the transposed conductor can be soft, semi-hard, or hard. If necessary, an adhesive can be applied outside the insulation layer, which melts and bonds in a hot state to form a self-adhesive transposed conductor. Transposed conductors can be used in layer windings, pancake windings, spiral windings, and internal shield inserted capacitor windings.

Structural Characteristics

Composed of multiple enameled copper flat wires, the flat wires are transposed according to specific rules to make the position of each strand relatively uniform in the magnetic field. They are then wrapped with multiple layers of insulating paper tape to ensure insulation performance.

Advantages

It can reduce load loss and winding hot-spot temperature rise, improve winding mechanical strength, achieve a compact structure, simplify coil processing technology, and shorten processing time.

Applications

The application fields of transposed conductors focus on the manufacturing of windings for electrical equipment requiring large current, low loss, and high reliability. The core application scenarios and specific equipment are as follows:

1. Power Transformer Field: It is the core winding material for large oil-immersed power transformers and high-capacity dry-type transformers, widely used in power grid transmission and distribution systems, substations, and other scenarios.

2. Special Transformer and Reactor Field: Suitable for furnace transformers, rectifier transformers, traction transformers, as well as high-voltage shunt reactors, current-limiting reactors, and other equipment.

3. High-end Motor Field: Used in windings of high-power generators, motors, new energy vehicle drive motors, rail transit traction motors, and other motors with strict requirements on efficiency and volume.

4. Other Electrical Equipment Fields: Can be used in intermediate frequency induction heating equipment, inductance windings of large energy storage equipment, etc. It is mainly used to manufacture windings of large oil-immersed power transformers, reactors, and high-capacity dry-type transformers, and also applied in electrical equipment with high performance requirements such as automotive motors.