JPS635887B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a continuous disk winding, and more particularly to a transposed structure of a continuous disk winding often used in core type transformer windings.

[Technical background of the invention and its problems]

Various winding methods are selected and applied to the windings used in core type transformers depending on the voltage and current of the windings, but continuous disk windings are particularly easy to work with due to their simple structure. It is widely used as a winding wire for a wide range of voltage classes due to its ease of use and excellent electrical and mechanical properties. As a conductor for such a continuous disk winding, one or more rectangular conductors (conductors with a rectangular cross section) are used in parallel depending on the required current capacity. Furthermore, for windings with large currents, one or more transposed wires made by twisting a plurality of rectangular conductors are used in parallel. Furthermore, in order to improve the conductor space factor within the winding, as shown in FIG. (This is called a composite rectangular wire). Figure 2 shows the conductor arrangement of a conventional continuous disk winding using a composite rectangular wire formed of two conductors. In the same figure, 1 is a disk winding, 2 is a section of the winding, 3 is another winding opposite to the disc winding 1 wound around the core leg 4. FIG. 3 is an enlarged sectional view of part A of the disc winding 1 shown in FIG.
shows two parallel conductors in a composite rectangular wire. Incidentally, the portion between sections of the winding where the winding moves to the next section is called a crossover. FIG. 4 is a perspective view of a typical outside transition between sections of winding. In the figure, the winding 10 is wound through an insulating spacer 9 disposed outside the cylindrical insulator 8, and the portion where the winding 10 moves to the next section, that is, the transition 11, is outside the winding 10. formed at the end. When there are two parallel conductors in a composite rectangular wire, the radial positions of the two parallel conductors are swapped at one transition point in the center of the winding, that is, they are transposed, so that the conductors face each other. This makes it possible to equalize the relative distances between each conductor and the windings facing each other, thereby equalizing the mutual inductance between each conductor and the opposing windings, and making it possible to equalize the shunting of parallel conductors.

However, the conventional continuous disc winding configuration described above has the following drawbacks. That is, when there are two parallel conductors of a composite rectangular wire, the conductor transposition with respect to the opposing winding is completed by exchanging the conductor radial position at one place in the center of the winding as described above, but in the case of a composite rectangular wire When the number of parallel conductors in a wire increases to four, the transposition between the parallel conductors becomes incomplete and the shunt current between the parallel conductors becomes unbalanced, which increases the winding load loss and, in turn, increases the winding temperature. This causes the problem of raising the temperature.

This will be explained below.

FIG. 5 shows the arrangement of each conductor in a section of a conventional winding wire in the case where there are four parallel conductors in the composite rectangular wire and the number of turns per section is three. In the figure, P represents the beginning of the winding, Q represents the end of the winding, and a, b, c, and d represent the four parallel conductors in the composite rectangular wire. Each parallel conductor has 1/4 of the number of turns,
A transition 12 is performed in which the radial position is exchanged between the 2/4 and 3/4 sections, and the mutual positions relative to the opposing winding (not shown) appear to be equal at first glance, but in reality, the following problems occur. be. That is, conductor a
and conductor d, or conductor b and conductor c, respectively, occupy symmetrical positions in each section, so the dislocation between them is perfect, but conductor b and conductor c are always in the middle of conductor a and conductor d. Placed. The fact that conductor b and conductor c always occupy the middle suggests that the arrangement of each conductor is averaged, and in fact the total length of each conductor is almost the same (that is, the resistance is the same), but the opposite winding (not shown) There is a non-negligible difference in the mutual inductance between the two. The shunt current of each conductor is determined by the impedance between each conductor and the opposing winding, so even if there is a slight difference in mutual inductance, if the resistance components are the same, there may not be much unbalance in the shunt current. In particular, as the transformer becomes larger in capacity, the core becomes thicker, the number of turns decreases, and the ratio of resistance to inductance decreases, resulting in extreme imbalance.

This shunt imbalance increases load loss and increases winding temperature, deteriorating transformer characteristics, and in extreme cases can cause winding burnout, so it must be avoided at all costs.

[Purpose of the invention]

The present invention has been made in view of the above points, and
The purpose is to provide an improved continuous disk winding so that even if there are four parallel conductors in the composite rectangular wire, the shunts are equal.

[Summary of the invention]

In order to achieve the above object, the present invention provides a continuous disc winding formed by continuously winding a composite rectangular wire consisting of four parallel conductors, in which at least one section of the disc winding is Among the four parallel conductors, two sets of conductors, each consisting of two adjacent parallel conductors, are swapped in their radial positions to form a bridge between the sections, as well as a cross between the sections. Between the sections, the four parallel conductors are crossed for each conductor, so that the radial positions of the parallel conductors are symmetrically exchanged.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to the drawings.

Figure 6 shows the conductor arrangement of the continuous disc winding according to the present invention, where P is the start of the winding, Q is the end of the winding, and a, b, c, d are composite rectangular wires. represents the four parallel conductors within. The figure shows an example where there are four parallel conductors in a composite rectangular wire and the number of turns per section is three, and each parallel conductor is 1/1/2 of the total length of the winding.
4, Crossing between sections 2/4, 3/4 13, 14,
15, but of these, the transition 14 between sections corresponding to the center of the total winding length is a new transition, and the transition 13 between sections corresponding to 1/4 and 3/4 of the total winding length is 15 is a conventional crossing. As shown in the figure, the new crossing 14 connects two adjacent conductors a, b, c and d of the four conductors a, b, c, and d in the composite rectangular wire into one set, respectively. The positions in the radial direction are exchanged between these two sets of conductors, and the positions in the radial direction are not exchanged between these one set of conductors, that is, between conductor a and conductor b, and between conductor c and conductor d. Further, the conventional bridges 13 and 15 are used to exchange the radial positions of the parallel conductors a, b, c, and d between the sections.

As explained above, the continuous disk winding according to the present invention employs a new transition 14 between the sections corresponding to the center of the overall length of the winding, so that the conductor that was previously located in the middle of the composite rectangular wire After crossing, conductor b and conductor c will be located at the end of the composite rectangular wire, and conversely, conductor a and conductor d, which were located at the end of the composite rectangular wire, will be located in the middle of the composite rectangular wire after crossing. By making such a new crossing in the center of the entire length of the winding, the positions occupied by each conductor in the radial direction of the winding become equal throughout the winding, and transposition is completely performed.

In the above embodiment, the new transition is limited to the center of the entire length of the winding, but it is sufficient to make the new transition approximately at the center of the total length of the winding. In addition, it is not necessary to provide a new crossing position only in the center of the entire length of the winding, but by making new crossings several times, each section of the entire winding where each conductor in the composite rectangular wire occupies an intermediate position is It goes without saying that the configuration may be such that it is divided into approximately halves.

〔Effect of the invention〕

According to the present invention, even when there are four parallel conductors in a composite rectangular wire, a continuous disk winding can be obtained in which the shunting of each conductor is equal. As a result, a compact transformer with low loss and a small cooling device etc. can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional composite rectangular wire, Fig. 2 is a cross-sectional perspective view of a continuous disc winding made of the composite rectangular wire of Fig. 1, and Fig. 3 is a cross-sectional view of part A of Fig. 2. An enlarged sectional view, Figure 4 is a perspective view of the outer crossing in Figure 3, and Figure 5 is a perspective view of the outer crossing in Figure 3.
This figure is a conductor layout diagram of a continuous disc winding constructed from another conventional composite rectangular wire, and FIG. 6 is a conductor layout diagram of a continuous disc winding that is an embodiment of the present invention. 1... Continuous disk winding, 2... Winding section, 3
...Opposed winding, 4... Core leg, 5... Flat conductor, 6, 7
...Insulator, 8...Cylindrical insulator, 9...Insulating spacer,
10... Winding, 11, 12, 13, 14, 15... Crossover.

Claims (1)

[Scope of Claims] 1. In a continuous disk winding formed by continuously winding a composite rectangular wire consisting of four parallel conductors, the four
Among the parallel conductors of the book, two sets of conductors, each consisting of two adjacent parallel conductors, are swapped in their radial positions to form a bridge between the sections, and also between sections other than the bridge between the sections. Now, there is a continuous disk winding characterized in that each of the four parallel conductors has a crossover. 2. The continuous disk winding according to claim 1, wherein at least one section of the disk winding is a section at a substantially central portion of the disk winding.