Process for producing transposition composite lead

Abstract

The invention discloses a process for producing a transposition composite lead, comprising the following steps of: enameling a group of one-step formed bare copper flat wires; transposing the finished enameled wires; insulating the transposed enameled wires via paper packing and arranging the enameled wires in parallel along a narrow edge; and uniformly wrapping insulating paper outside the paper packed enameled wires which are arranged in parallel along the narrow edge so as to obtain the transposition composite lead. In the invention, a coil winding process is easy for operation; and when the obtained transposition lead is applied to ultrahigh voltage transformers and extra-high voltage transformers, favorable impact voltage distribution is provided and the local discharging of coils is reduced.

Description

Production process of transposition combined wire technical field The invention relates to a transposition combined wire for transformer windings, in particular to a production process for a transposition combined wire used for large-capacity, high-voltage DC transformer windings. Background technique As the voltage and capacity of power grids and power stations increase, the voltage level and capacity of transformers also continue to increase. At the same time, winding damage accidents of large power transformers caused by external short circuits have also increased significantly, and the radial deformation of compressed windings is one of the typical forms of short circuit damage. Therefore, the market needs super large transformers with strong short circuit resistance. The combination wire came into being under this situation. The so-called transposition wire is to make multi-strand scattered and wound wires. Before winding the coil, they are transposed continuously a...

AI Technical Summary

Problems solved by technology

For example, the specification of semi-rigid self-adhesive transposition wire is 1.80×13.20, the number of wires is 59, the yield strength is 200---240N / m㎡, the transposition pitch is 110mm, and the insulation thickness of paper package is 0.75mm. The insulating paper is worn or bulged, and the production process is very difficult, which has considerable hidden dangers to product quality;

2) If the transposition wire is incompletely transposed or missed during the manufacturing process, or there is a deviation during winding, it is difficult to ensure the balance of the resistance and reactance of each winding, and a pressure difference will be generated, causing circulation loss ;

3) The transposition wire is wound into a cylindrical winding, and no transposition is required during the winding process, but if the additional loss of this winding is large, the loss of the transformer will increase, the noise will increase, and the temperature rise will increase , the output is reduced, the life of the transformer is reduced, and the transformer may be burned in severe cases

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