JPS641043B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a transposed structure of a continuous disc winding in a core transformer winding.

[Technical background of the invention]

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. Due to its ease of use and excellent electrical and mechanical properties, it is widely used as a winding wire for a wide range of voltage classes. As the name suggests, continuous disk winding is formed by winding the conductor continuously from the beginning to the end without cutting it midway, eliminating the need for conductor connection work midway through the winding. Depends on. As the conductor for the continuous disc winding, one or more rectangular conductors (the most common conductor with a rectangular cross section) may be used in parallel, depending on the required current capacity, or windings with larger currents may be used. For wires, one transposed wire is made by twisting multiple rectangular conductors.
A book or multiple books are used in parallel.

Figure 1a shows the conductor arrangement of a continuous disk winding 1 that uses two conductors in parallel. a and b indicate two parallel conductors. As is clear from the figure, when passing from one section 2 of the winding to the next section 3 (this is referred to as a crossing), the parallel conductors change their radial positions. In addition, 4 in the figure shows the winding opposite to the winding 1 wound on the iron core leg 5 side.

FIG. 2 is a perspective view of the outer transition section. As can be seen from this figure, the conductors are crossed one by one.
By doing this, the radial dimension d of winding section 2 or 3 (this is called the build)
can be wound without extreme changes from its upper and lower sections. Furthermore, by exchanging the radial positions of the parallel conductors during crossing, the relative distances between each conductor and the opposing winding 4 can be equalized. This equalizes the mutual inductance between each conductor and the opposing windings, making it possible to equalize the shunting of parallel conductors.

The transition takes place on the inside and outside of the winding section, but by adjusting the mutual positions of these according to the number of parallel conductors and the thickness of the conductors, the convexity at the transition section is eliminated, and the inside and outside diameters are almost perfectly round. It is possible to roll it up.

[Problems with background technology]

However, this conventional continuous disk winding method has the following drawbacks. In other words, when there are two parallel conductors, the conductor transposition to the opposing winding is completed by exchanging the conductor radial position at each crossing as described above, but when the number of parallel conductors in the section becomes four. In this case, the dislocation between the conductors becomes incomplete, causing an imbalance in the shunt between the parallel conductors.
This increases the winding load loss and, in turn, increases the winding temperature. This will be explained below.

FIG. 3 shows the arrangement of each conductor in a section in a conventional winding method in which there are four parallel conductors and the number of turns per section is two. In the figure, the radial positions of the parallel conductors are changed for each section, and although their mutual positions with respect to the opposing windings appear to be equal at first glance, there is actually the following problem. That is, conductor a and conductors b and c occupy symmetrical positions in each section, so dislocation between them is safe, but conductors b and c are always placed between conductors a and d. be done. conductor b
The fact that and c are always in 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 mutual inductance for the opposing windings There is a difference that cannot be ignored. 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 windings decreases, and the ratio of resistance to inductance becomes smaller, 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]

In view of the above-mentioned points, an object of the present invention is to provide an improved continuous disk winding for a core type transformer in which the shunt current is equal even when there are four parallel conductors in a section.

[Summary of the invention]

In order to achieve this object, the present invention aims at radially positioning two sets of four parallel conductors constituting a continuous disk winding without changing the positions of two adjacent conductors. The conductor is characterized in that the transposition is performed by replacing the conductor with the conductor and passing it between the sections, so that the proportion of the position occupied by each conductor in the radial direction is equal as a whole.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings.

Figure 4 shows the arrangement of each conductor in a continuous disk winding according to an embodiment of the present invention.The general crossing is the same as in the conventional method, but the section corresponding to the center of the entire length of the winding is A new crossing method is used at the crossing point. In other words, for the crossing at this point, two of the four conductors that are adjacent to each other are crossed at once, and the radial positions of these two conductors are not swapped, and the conventional method is used for the two sets of adjacent two conductors. The idea is to have them cross over. By adopting this crossing method, conductors b and c, which were previously located in the middle, will move to the ends after crossing, and conversely, conductors a and d, which were located at the ends, will be located in the middle. Become.

Therefore, by making this new transition in the middle of the winding, each conductor can occupy a position halfway between each half of the winding. If the sections occupying the middle become equal, the conductors at both ends and the middle will be placed in a completely symmetrical arrangement with the conventional distribution between general sections, so each conductor will occupy an equal position over the entire length of the winding. Therefore, the dislocation will be completed and the correct flow will be divided.

In the above explanation, the new dislocation was limited to the center of the winding, but it is sufficient to set this location approximately at the center as a rough guide. Therefore, it is clear that the overall length of the section in which each conductor occupies the intermediate position is approximately 1/2. Also, by crossing two wires at the same time, the difference in radial dimension between the upper and lower sections becomes larger than in the conventional method, but this can be done without any problem by adjusting the position of the transition between the inside and outside and inserting an insulating filler.

〔Effect of the invention〕

As described above, according to the present invention, even when there are four parallel conductors in a section, a continuous disk winding can be obtained in which the branch currents of each conductor are equal. As a result, it becomes possible to obtain a compact core type transformer with low loss and a small cooling device.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the conductor arrangement of a continuous disc winding composed of two parallel conductors, where a is a cross-sectional perspective view, and b
is an enlarged view of part A, Figure 2 is a perspective view showing conductor replacement at the outer transition section, Figure 3 is a conductor arrangement diagram of a conventional continuous disk winding composed of four parallel conductors, and Figure 4. 1 is a conductor layout diagram of a continuous disc winding wire, showing an embodiment of the present invention, which is constructed of four parallel conductors. 1... Continuous disk winding, 2, 3... Winding section, 4... Opposing winding, 5... Iron core leg.

Claims (1)

[Claims] 1 Continuous disk winding of a core transformer formed by continuously winding four parallel conductors while alternating inside and outside of each section, symmetrically replacing and transposing the radial positions of the conductors. 4 above between at least one section.
Two adjacent conductors of the parallel conductors of the book are made into pairs, and the two conductors are kept parallel, and the radial positions of the two pairs are exchanged and passed between the sections. A continuous disk winding of a core type transformer characterized by an averaged radial arrangement of.