Rectangular cross section stranded conductor and fabrication method and apparatus thereof

Abstract

The invention relates to a rectangular-section stranded winding wire for motors, transformers and reactors, which is characterized in that the wire cores of the rectangular-section stranded conductors are arranged in matrix or honeycomb. The processing method is to arrange the compression forming device at the twisting point of the wire, and adjust the relative position of each wire core of the wire by the pressure wheel, so that it is arranged in an orderly and regular manner. The cross-sectional profile of the standard wire is rectangular, and the winding wire has polyimide Amine and NOMEX insulating layer can be used to produce reactors with AC 1000kV and DC 800kV.

Description

technical field [0001] The invention relates to a rectangular winding wire for motors, transformers and reactors, in particular to a winding wire with a rectangular cross-section twisted from multiple wires and a processing method and device thereof. Background technique [0002] The winding wires of large-capacity motors, transformers, and reactors have a large cross-sectional area. In order to make the structure of the winding wires compact, they are usually wound with rectangular cross-section wires. The traditional rectangular cross-section wires directly use solid core conductors such as copper bars and aluminum bars. , this conductor has high rigidity, and the winding process is difficult. Due to the limitation of the winding process, the cross-sectional area of ​​the solid core conductor is limited, which makes the capacity or voltage level of the motor, transformer, and reactor limited. For example, only 500kV reactance can be produced at present. Reactors cannot pro...

AI Technical Summary

Problems solved by technology

[0003] 1. The inner core of the wire is irregularly formed, the arrangement is chaotic and irregular, and the gap is uneven, which is prone to high-voltage discharge

[0004] 2. The contour shape of the conductor section is only approximately rectangular, the surface wire is not flat, the center of the outer wire on the same side is not on the same straight line, and the arc radii of the four corners are not uniform, which will give the subsequent insulating layer Wrapping process creates difficulties and adversely affects insulation performance

[0005] 3. The deformation of each wire in the conductor is inconsistent, and the protective film on the surface of the conductor with large deformation is damaged, which increases the harmonic impedance and reduces the electrical performance

The existing process is a two-step forming process. First, the wire is twisted into a circular cross-section, and then the twisted wire with a circular cross-section is drawn into a rectangular cross-section by a forming device. The unfavorable consequences of reducing the core gap are: the deformation of each core is inconsistent, the deformation of the surface core is large, and the deformation of the center layer is small, so that the originally regularly arranged cores become irregularly arranged, and the gap becomes uneven.

[0009] 3. The structural design of the compression molding die is unreasonable. Using a conventional drawing die, the cross-sectional profile of the wire is forced to be drawn into a rectangle by the die.

The disadvantages of this mold are: ①, the mold is fixed when it is working, and when the wire moves, there is strong sliding friction with the mold, the surface wire is severely scratched, there are many burrs, and the oxidation protection layer is destroyed; The mold is easy to wear, the service life is short, and the energy consumption of the equipment is increased; ③. The size of the mold is fixed and cannot be adjusted, and only one specification of wire can be processed. Different specifications of the wire need to correspond to different molds, so there are many specifications of the mold, and the cost High; ④, when changing the mold, the conductor must be pulled again, the operation is cumbersome and time-consuming, the labor intensity of the workers is high, and the production efficiency is low

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