JPS59117008A - Turnover composite winding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transposed composite winding used for winding of induction machines and rotating machines such as transformers and reactor equipment.

This type of transposed composite winding, for example, the transposed composite winding used in transformers, etc., is made by insulating formal resin 2 on the surface of a strand conductor 1 made of rectangular copper wire, as shown in Fig. 1. Using a plurality of wires 3, these wires 3 are arranged in two rows A and H, and the wires located at the ends of each row A and B are connected to the ends of other adjacent rows B and A. Insulating paper 4 such as kraft paper or Manila lath kraft paper is wound around the entire outside of the plurality of elements a3.

In such a transposed composite winding, the effect of magnetic flux in each wire conductor 1 is transposed, so that the influence of the magnetic flux is small, and the difference in induced electromotive force is reduced.

For this reason, it is known to be effective as a winding wire for transformers, rotating machines, etc., and can reduce copper loss and winding processing time in large-capacity oil-immersed transformers, etc. It has many advantages such as these, and is often used as a winding for large-capacity oil-immersed transformers.

However, because synthetic resin such as formal resin is baked at high temperature to seal the insulating coating of the wire conductor, equipment costs such as baking furnaces are expensive, and due to the rise in oil prices, formal resin materials and their baths are required. Not only is the cost of the agent becoming more expensive, but also the cost of burning due to the large number of seizures is increasing due to the increase in energy costs. Therefore, at present, transposed insulated wires with baked formal enamel are only used in transformers with a capacity of 100,000 KVA or more. However, a large eddy current loss is equivalent to a large copper loss in the transformer, which increases the energy loss consumed by the transformer, so in reality it should be used in a transformer of about 10,000 KVA. However, the issue of price has become an issue.

In view of these points, the present inventors investigated possible materials to replace conventional formal resins and found that the problem could be solved by using a specific plastic film.

The gist of the present invention is to arrange a plurality of wires each having an insulating coating formed on each wire conductor in a plurality of rows, and to connect the wires located at the ends of each row of wires to adjacent wires. In a transposed composite winding formed by sequentially twisting dislocations to the end positions of a row of strands and insulating the outside of all these strands with an insulating material,
At least one of polyolefin film, fluororesin film, polyester resin film, and aromatic plastic film excluding polystyrene and polyphenylene oxide is wound around the insulation coating of at least the wire conductor for insulation. It is something.

To explain in detail below, the plastic film used in the oil-immersed transformer must satisfy the following conditions.

■ It must have excellent oil resistance. ■ It must have excellent water resistance. ■ It must have a temperature of 110°C or higher for use in oil-immersed transformers. Therefore, it is important to check whether the various plastic films satisfy the above conditions. When evaluated, the results were as shown in Table 1.

According to the evaluation results in Table 1, polyolefin films, fluororesin films, polyester resin films, and aromatic plastic films other than polystyrene and polyphenylene oxide satisfy the above conditions. Films of tetrafluoroethylene/hexafluoropropylene copolymer (CF'BP) and tetrafluoroethylene/hexafluoropropylene copolymer (TEHP) are most preferred. This is the reason why the present invention uses polyolefin films, fluororesin films, polyester resin films, and aromatic plastic films excluding polystyrene and polyphenylene oxide. In the present invention, it is preferable to use a film that satisfies all the characteristics, but two or more types of films may be used in combination to complement each other's deficiencies 5Q.

For example, polyethylene terephthalate has poor water resistance but high mechanical strength, while polytetramethylpentene has excellent oil resistance and high temperature resistance but has slightly weak mechanical strength, so these are used in combination. They are designed to complement each other and have good characteristics as a whole.

The embodiment shown in FIG. 2 will be described in detail below.

FIG. 2 shows the overall configuration of an example of the transposed composite winding of the present invention, in which the strand 13 is a strand conductor 1 such as a rectangular copper wire.
1 is coated with an insulating coating 12, and this insulating coating 12 is made of the above-described polyolefin film,
At least one of a fluororesin film, a polyester resin film, and an aromatic plastic film excluding polystyrene and polyphenylene oxide is wound.

A plurality of the strands 13 are arranged in a plurality of rows, for example, two rows A1B, and the strands located at the ends of each array AXB are sequentially transposed to the positions of other adjacent strands B and A. It is subjected to a transposition twisting process, and its entire outside is covered with an insulating material 14 such as insulating paper.

As the single wire insulation coating 12 in the above, F, E,
Example 11 A single P film (thickness 0.05 mm) was wound around a single T, P, X film (thickness 0.02 mm), and a polyester tape ( Thickness 00
In Example 2, one sheet of polypropylene film (thickness 0.03 mm) was wound, and a polycarbonate film (thickness 0.03 mm) was wound on top of that.
In Example 3, one sheet of kraft paper (0.03 mm thick) was wound, and -
C
0.03 mm thick) was wound in one layer as Example 4,
The test results for each transposed composite winding having 13 strands, wire size 1.8 x 8, and 10 sheets of common insulating paper (0.075 kraft paper) were shown in Table 2.

Table 2 This type of transposed composite winding preferably satisfies the following characteristics.

■ Dielectric breakdown characteristics as a final product ■ Compression characteristics added to the final product ■ Eddy current product According to Table 2, the present invention improves the dielectric breakdown characteristics of the final product, and each element under a compressive charge of 4J. It is also suitable for continuity tests between wires, and the eddy current product (copper loss) is the same as before.
This shows that the above-mentioned characteristics are fully satisfied and that it is extremely preferable as a dislocation composite winding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional insulated wire with a transposed conductor, and FIG. 2 is a perspective view showing an embodiment of the present invention. 11...Element wire conductor 12...Insulating coating of plastic film 13...
Element wire 14...Insulating material

Claims (1)

[Claims] A plurality of strands formed by forming an insulating coating on each strand conductor are arranged in a plurality of rows, and the strands located at the end of each strand row are connected to other strands adjacent to each other. In a transposed composite winding in which the wires are twisted sequentially to the end positions of the wires, and the outside of the entire wire is insulated with an insulating material, at least the insulation coating of the wire conductor is 1. Polyolefin film, fluororesin film, polyester resin film, aromatic plastic film (however, polystyrene,
A transposed composite winding characterized in that at least one of polyphenylene oxide film (excluding polyphenylene oxide film) is wound and insulated.