JPS5947720A - Transformer winding - Google Patents

Abstract

PURPOSE:To reduce load loss and to make winding compact by a method wherein two jumpers are provided between the upper section and the lower section in such a manner that a transposition in the direction of the radius of the winding between the upper section and the lower section is made only between two adjacent parallel conductors of three parallel conductors and another one parallel conductor. CONSTITUTION:In the first one third of the sections from the starting end of the winding (up to the 4th section), two parallel conductors (a) and (c) of three parallel conductors are transposed at each section and the parallel conductor (b) is jumped to the next section being held between the conductors (a) and (c). Between two sections which correspond to one third from the starting end (the 4th section and the 5th section), transposition in the radius direction is made only between two adjacent parallel conductors (b) and (a) and another one parallel conductor (c) of three parallel conductors (a), (b) and (c). Between two former conductors, (a) and (b), the transposition is not made. With this constitution, even if the winding in the section has three parallel conductors, it is possible to obtain an interleaved winding in which current distribution can be uniform among each parallel conductor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a transposed structure of an interleaved winding, which is often used in transformer windings, particularly core type transformer windings.

[Technical background of the invention and its problems]

The winding used in a core transformer has a voltage of the winding,
Various winding methods are used depending on the current, but interleaved winding is often used for high voltage windings because of its excellent electrical characteristics against steep surge voltages.

As the conductor of the interleaved winding, one or more rectangular conductors (conductors with a rectangular cross section) may be used in parallel depending on the required current capacity, or if the current capacity is large, multiple rectangular conductors may be used. 1 wire made of insulated flat wires
Figure 1(a) shows the conductor arrangement of an interleaved winding 1 in which two conductors are used in parallel. The numbers in the drawing of the winding A part shown are the winding numbers, and
Alphabella) a and b indicate two parallel conductors. As is clear from this figure, the transition from one section 2 of the conductor to the other section 3 (hereinafter referred to as crossing)
In this case, the parallel conductors are swapped in their radial positions. This is called dislocation.

FIG. 2 is a view of the cross section of section 3 in FIG. 1 viewed from the section 2 side. As shown in this picture! The body migration is done one by one. By doing so, it is possible to wind the section 2 or 3 without creating an extreme difference in radial dimension between the crossing portion 9 and its upper and lower sections. In addition, by changing the radial position of the parallel conductors at the time of crossing, the relative distance υ between each conductor and the opposing winding 4 is 1
'jl& can be made equal. This makes it possible to equalize the mutual inductance between each conductor and the opposing windings, and to equalize the current shunts in the parallel conductors. Transferring is performed on the inside and outside of the section, but by adjusting the mutual phase of these according to the number of parallel 7Bs and the thickness of the conductor, it is possible to eliminate the protrusion at the transfer portion, and almost eliminate the transfer on both the inner and outer diameter sides. It will be possible to get to the root cause.

However, the conventional interleaved winding described above has the following drawbacks. That is, when there are two parallel conductors in a section, the transposition between the parallel conductors with respect to the opposing windings is completely achieved by exchanging the radial position of the conductors at each crossing as described above, but the parallel conductors in the section If there are three, the dislocation between the conductors is incomplete,
An unbalance occurs in the current shunt between the parallel conductors, which increases the winding load loss and eventually raises the winding vortex i. The reason why this current shunt is unbalanced will be explained below.

FIG. 3 shows the position of each conductor in a section when an interleaved winding wire with three parallel conductors and four turns per section is wound in a conventional manner.

In the figure, the radial positions of the parallel conductors are changed for each section, and the mutual positions relative to the opposing windings appear to be equal at first glance, but there is the following problem. That is, conductor a and conductor C both occupy symmetrical positions in each section, so that the transposition is complete, but conductor A is always located between conductor a and conductor C. The fact that the conductor always occupies an intermediate position suggests that each conductor arrangement is averaged, but there is a non-negligible difference in mutual inductance for a pair of windings. Therefore, since the current shunt to each parallel conductor is determined by the impedance between each conductor and the opposing winding, even if there is a slight difference in mutual inductance, the current shunt will be In some cases, unbalance does not occur to a great extent.However, as the large-capacity transformer becomes EL and the iron core becomes thicker, the number of turns is reduced, and the resistance/inductance becomes smaller, so the unbalance increases. Current shunt imbalance increases load loss and increases winding temperature, which poses a problem of deteriorating transformer efficiency.

[Purpose of the invention]

The present invention solves the above problems, and its purpose is to:
An object of the present invention is to provide an interleaved piezo winding which is improved so that current shunting becomes equal even when the number of parallel conductors in a section is three.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides for a winding portion other than that between the first winding portion of three parallel conductors and the winding portion of the second three parallel conductors to be wound next. In a transformer winding in which a plurality of sections are wound around the core legs by sandwiching the winding portions of three parallel conductors, the upper and lower sections fL4'l are adjacent to each other among the three parallel conductors. At least two transition portions are provided between the upper and lower sections in which the radial position of the winding is exchanged only between the two parallel conductors and the remaining parallel conductor. When there are two locations, they are provided in sections corresponding to about 1/3 and about 2/3 from the beginning of the transformer winding. I will explain.

Figure 4 shows the arrangement of each conductor at the winding edge of the interleaved transformer of the present invention, showing 1/3 and 2
The outer diameter of the winding between the sections (till (
1) A new crossing method is adopted at the crossing section, and the crossing between other sections is the same as the conventional crossing method. That is, FIG. 4 exemplarily shows three parallel conductors aS bX c, the number of windings per section is 4, and the number of sections is 12.
Interleaved windings (referred to as 1st, 2nd, . . . 12th sections from the top of the winding) are shown,
From the beginning of the winding to the section corresponding to 1/3 (fourth section), the bridge bodies a and C at both ends of the three parallel conductors are changed to the section type, and all 4F bodies are replaced. is sandwiched between the leg a and the conductor C, and crosses between sections. Therefore, in the transition between sections corresponding to 1/3 from the beginning of the winding (between the fourth section and the fifth section), two adjacent conductors of the three parallel conductors o, b, and a are The radial position is exchanged with the remaining one bridge body C, and the former two conductors bz
afri3-Shizuku does not perform radial replacement. Furthermore, between sections corresponding to 1/3, that is, 2 from the beginning of the volume.
73 (between rA 8th section and 9th section), parallel conductor c, aSb 3
The radial position is swapped between the two adjacent bridge bodies e and a of the tree and the remaining one conductor, and the radial position is swapped between the former two conductors e and a. Don't do it. In addition, in the crossing between sections other than those described above, the conductors at both ends of the three parallel conductors are replaced with sections, and the middle conductor is not replaced, as in the conventional case.

In the full length example, by passing the conductor between sections as described above, the conductor that was previously located in the middle of the three parallel conductors is now located at the end, and vice versa. One of the conductors will be located in the middle. Therefore,
By making new crossings at the 1/3 and 2/3 sections from the beginning of the winding, the barrel body occupies a position halfway between each 1/3 of the winding. In other words, each parallel conductor occupies an equal position over the entire length of the winding, so that transposition is completely performed and correct current shunting is performed. On the other hand, regarding the electrical characteristics against a steep surge voltage, exactly the same results as when the L is wound in the conventional method can be obtained.

In addition, in the above example, t, the new crossing is 1/1 from the beginning of winding.
The position is 3 and 2/3 sexy/, but as a rough guide, a deviation of approximately 1/3 or approximately 2/3 is sufficient, and you can also do this new crossing without worrying about that position. It is obvious that it is sufficient to repeat the process several times or all the times so that the positional relationships of the parallel conductors are generally equal as a whole.

In addition, in the above embodiment, the winding inner diameter side is folded at 9 portions between the sections without a transition on the inner diameter side of the winding, and the wire is folded. By adopting a new crossing method for the inside winding υ part or the winding inside diameter 9 part, current shunt to each parallel conductor can be achieved without impairing the electrical characteristics against steep surge voltages. It is clear that an equalizing interleaved winding is obtained.

Furthermore, according to the above embodiment, the difference in radial dimension between the upper and lower sections is larger than that of the conventional method due to the provision of the bridge 9 when the amount of water is 2, but the adjustment of the location of the bridge and the filling with insulators are necessary. If this is done, a large set of interleaved windings without any problems can be obtained.

〔Effect of the invention〕

According to the present invention, even if there are three parallel conductors in a section, it is possible to obtain an interleaved winding in which the current distribution of each parallel conductor is equal, and therefore the loss is low and the cooling device is small.1. *Compact transformer windings can be provided.

[Brief explanation of the drawing]

Figure 1 is a conductor layout diagram of a conventional interleaved winding composed of two parallel conductors, (a) is its cross-sectional view 1, (b)
is an enlarged explanatory diagram of part A, Figure #g2 is a top view of the crossing section in Figure 1, Figure 3 is a conductor arrangement diagram of a conventional interleaved winding composed of three parallel conductors, and Figure 4 The figure shows parallel conductor 3
1. Interleaved winding, 2.3. Sections of interleaved winding, 4.・・・Opposing winding, 5...
- Iron core legs, a, b, c...parallel conductors. (8733) Agent Patent attorney Yoshiaki Inomata C and others 1
given name)

Claims (2)

[Claims] (1) Between the winding part of the first three parallel conductors and the winding part of the next three parallel conductors of f42, there are three windings of the parallel conductor of the other number of windings. In a transformer winding, in which several sections are wound around the iron core legs, two of the three parallel conductors are connected between the upper and lower sections, and the remaining A transformer winding characterized in that at least two transition parts are provided between the upper and lower sections, the radial position of the winding being exchanged only with one parallel pick-up body. (2) The transformer winding according to claim 1, wherein the transition portion between the upper and lower sections is provided in a section corresponding to about 1/3 and about 2/3 from the winding start of the transformer winding. .