JP3006258B2 - Dislocation conductor helical coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical coil for winding a plurality of parallel-connected conductor bundles often used for relatively large current and low voltage windings such as transformers and reactors, while transposing. In particular, the present invention relates to a dislocation conductor helical coil using a dislocation conductor as a conductor.

[0002]

2. Description of the Related Art FIG. 2 is a schematic diagram showing a winding cross-sectional arrangement and a leakage magnetic flux distribution of a transformer. In this figure, a low-voltage winding 1 composed of a helical coil is provided so as to be inserted into an iron core 3, and a high-voltage winding 2 is arranged at a predetermined interval on the outer diameter side. In an actual transformer, there is a three-winding transformer in which a tertiary winding is arranged between the low-voltage winding 1 and the iron core 3. Also,
The tertiary winding may be a helical coil.

Most of the voltage induced in these windings 1 and 2 is due to the magnetic flux passing through the iron core 3. On the other hand, when a load current flows through the windings 1 and 2, a leakage magnetic flux is generated. A magnetic flux line 4 indicated by a dotted line in this figure indicates an approximate distribution of the leakage magnetic flux. The magnetic flux lines 4 are uniformly distributed in the axial direction at the axial center portions of the windings 1 and 2 indicated by the line A-A, and the magnetic flux lines are distributed right and left at the upper and lower ends as shown. do.

FIG. 3 is a graph showing the distribution of the magnetic flux density of the leakage magnetic flux along the line AA in FIG. In this figure, the horizontal axis is the radial coordinate and the vertical axis is the magnetic flux density. A in FIG.
The magnetic flux density distribution on the -A line has a trapezoidal shape as shown in the figure, and the left-hand ascending slope is inside the low voltage winding 1 and the right-hand ascending slope is inside the high voltage winding 2. The distribution of the magnetic flux densities respectively, and the flat portion between them is the high voltage winding 2
This is a distribution of a space in which no current flows between the low voltage winding 1 and the low voltage winding 1.

[0005] Assuming that one conductor in the low voltage winding 1 is on the innermost side, this conductor hardly interlinks with the leakage magnetic flux. On the other hand, the conductor on the outermost diameter side links almost all of the leakage magnetic flux in the low-voltage winding 1. As is well known, when a plurality of transformer winding conductors are used in parallel connection, a difference in induced voltage occurs due to a difference in the number of interlinks of leakage magnetic flux between the parallel conductors, and as a result, a circulating current flows between the parallel conductors. There is known a phenomenon in which the current sharing becomes unbalanced and the load loss increases. Therefore, in order to eliminate the imbalance of the interlinkage magnetic flux between the parallel conductors, since the relative position of the conductors, especially the amount of interlinkage magnetic flux greatly changes depending on the radial position of the conductor as described above, the dislocation that mainly changes the radial position is It is common to employ a configuration that is performed and magnetically balanced.

FIG. 4 is a schematic sectional view showing a conductor arrangement of the helical coil 100 as the low-voltage winding 1. Conductor 1
Reference numeral 01 denotes a dislocation conductor in which a plurality of formal rectangular wires are displaced and insulated in common as described later. In general, a helical coil may use a conductor in which a rectangular wire made of copper or aluminum is insulated and coated with insulating paper or the like. Although the cross-sectional shape of the conductor 101 is square in the figure, there are various ratios between the thickness dimension q, which is the dimension in the radial direction, and the width dimension p, which is the axial dimension, in practice. In the case of a wire, the thickness dimension q is usually sufficiently smaller than the width dimension p, but in the case of a dislocation conductor, these values are substantially the same, and are much larger than the dimension of one rectangular wire. Is common.

The helical coil 100 has a cylindrical shape. The left side of the figure is the inner diameter side, the vertical direction is the axial direction (z), and the direction from left to right is the radial direction (r). The helical coil 100 has conductors 11 constituting the conductor bundles 111 to 181 when the number _nz arranged in the axial direction is 2 and the number _nr overlapped in the radial direction is 4.
The number of 1 is eight, and the number of conductors that transpose at one time is one.
In an actual helical coil, when the conductor is a single rectangular wire, the number of overlaps _nr is usually 10 or more, and in the case of a dislocation conductor, it is about 4 as shown.

Numerical values 1 to 8 shown in the eight conductors 101 are conductor numbers, and eight conductor numbers 1 to 8 are electrically collectively connected to lead ends (not shown) at the upper and lower ends of the helical coil 100. It is connected. Helical coil 1
00 is composed of eight blocks 11 to 18, and each block has five turns. Block 1
Reference numeral 1 denotes a top conductor bundle 111, middle conductor bundles 112 to 114 (not shown), and a bottom conductor bundle 115. One conductor bundle is collectively wound to form one turn, and is sequentially arranged in the axial direction from the conductor bundle 111 to 112 and 113 so as to be wound on a bobbin.
Five turns are wound up to 5 to form one block. In the block 11, the relative positions of the conductors 101 of the conductor numbers 1 to 8 do not change. In the figure, conductor bundle 111 and conductor bundle 1
This point indicates that the relative positions of the conductor numbers are the same for Nos. 15 and 15.

In the block 12, the positions of the eight conductors 101 are shifted to the right by one conductor at a time in comparison with the conductor bundle 115. That is, conductor numbers 1, 2, and 3
In block 11, what was located on the innermost side moved to the right by one conductor, conductor number 4 descended from top to bottom, and conductor numbers 5, 6, and 7 moved to the left by one conductor. , Conductor number 8
Has moved to the top left where conductor number 1 was. Such movement of the conductor position is called dislocation. The dislocations where such dislocations are performed are provided at seven locations at each transition of the block. If the same dislocation is performed again from the lowermost block 18, it returns to the conductor position of the block 11. I have. That is, the relative position of the conductor in the conductor bundle has rotated one turn in the entire helical coil 100.

As a result of the rotational movement due to such dislocation, the conductor number 1 is located at the innermost position on the block 11,
2 is the second from the inner diameter side, block 13 is the third, block 14 is the fourth, in other words, it is located on the outermost diameter side, and all are located at four different radial positions. Blocks 15 to 18 also change the radial position in the same manner. The same applies to other conductor numbers 2 to 8, and all the conductors 101 have an equal positional relationship with respect to the radial position. Since the amount of interlinkage of the leakage magnetic flux changes mainly in accordance with the radial direction, such dislocation causes the conductor number 1
-8 are approximately balanced. In addition, the fact that all the conductors 101 have the same radial positional relationship means that the conductor numbers 1 to 8 have the same length. Not only helical coils but also transformer windings consisting of multiple parallel conductors undergo transposition according to the type of winding. It has been transposed to be the same.

FIG. 5 shows the upper two conductor bundles 11 of the block 11.
FIG. 11 is a cross-sectional view of the first and second conductor bundles.
Is provided. The gap between the conductors in the conductor bundle 111 and the gap between the conductor bundles 111 and 112 form a cooling duct 103 through which a cooling medium for cooling the conductor passes. FIG. 6 is a detailed cross-sectional view of the conductor 101. An odd number of formal rectangular wires 105 are arranged side by side as shown in FIG. It is called a dislocation conductor for its insulation. However, in the case of the helical coil 100, seven rotations are performed, and as a result, all the conductors 101 become one.
Although the frequency of dislocation is only rotation, in the case of a dislocation conductor, transposition is performed at a high frequency, and each flat wire is magnetically equal. Therefore, it can be handled as a single conductor in the winding operation, and is particularly suitable for a coil with a large current. Although the thickness dimension of the formal rectangular wire 105 is about 2 mm, the thickness dimension of the dislocation conductor 101 is about 20 mm because it overlaps about 10 in the radial direction as shown. In addition, the width dimension is also a dimension in which the two formal rectangular wires 105 are arranged, which is also about 20 mm. However, the dimensions of the formal rectangular wire 105, the number thereof, and the like can be freely set in design.

FIG. 7 is a perspective view of a dislocation portion schematically showing a state of dislocation performed when moving to an adjacent block. FIG. 8 is a view at each position a, b, c, d, e, and f in FIG. It is sectional drawing which shows the position of each conductor. In these figures, the position a is the conductor position before the dislocation and corresponds to that of the block 11 in FIG. Position f is the conductor position after the end of the dislocation,
Coincides with that of 2. That is, FIGS. 7 and 8 show a dislocation portion that moves from block 11 to block 12. The degree of bending of the conductor 101 in FIG. 7 is illustrated as being much tighter than actual. In addition, since the lower side of the figure is the inner diameter side, the actual dislocation portion is actually an upwardly convex arc.

The dislocation is performed in the following order. From the position a belonging to the last conductor bundle 115 of the block 11, the conductor numbers 5 and 6 crush the dislocation space of the filling 102 and move radially toward the inner diameter side, and as a result, a gap indicated by a chain line in FIG. 8 is formed. To position b. In FIG. 8, the conductor moving toward the position b and its direction are indicated by arrows. The conductor number 4 at the outermost diameter from the position b moves in the axial direction to become the position c. The conductor numbers 1, 2, and 3 move in the radial direction from the position c toward the outer diameter, and a gap shown by a chain line in FIG. The conductor number 8 moves axially in this gap to the position e, and a gap is formed on the innermost diameter side of the conductor numbers 4 to 7. The conductor numbers 6 and 7 move in the radial direction toward the inner diameter side to generate a dislocation space in which the filling material 102 is inserted in the center of the coil to become a position f, and the dislocation is completed, and this position f is the first conductor of the block 12. It belongs to the bundle 121.

As described above, by alternately repeating the axial movement and the radial movement of the conductor, the position of each conductor is consequently moved so as to rotate clockwise by one conductor, and transposition is performed. Performing the axial movement and the radial movement at separate positions in this manner is a configuration in which the corners of the conductor 101 do not hit each other, the insulating coating 104 is broken, and the flat wires do not electrically contact with each other. Therefore, the filling material 102 that forms the above-described dislocation space is required.

[0015]

As apparent from the above description, a dislocation space is required for the conductor 101 to move in the axial direction and the radial direction at the dislocation portion.
In the case of 0, the filling 102 is provided as shown in FIGS. The space secured by the filling 102 is required only at the dislocation portion, and is unnecessary at other portions. Since the filling 102 requires a cross-sectional area of at least one conductor, eight bundles of helical coils 1 as shown in the figure are used.
In the case of 00, the coil width dimension Q is about ４ times as large as that in the case where the filler 102 is not provided.

In the case where a helical coil is formed by a normal rectangular wire, the number of conductors constituting a conductor bundle is increased instead of the cross-sectional area of one conductor being small.
However, when the dislocation conductor 101 is used as described above, the number of conductor bundles is reduced because the cross-sectional area of the conductor 101 is large, and as a result, the filling 102 The ratio of the occupation becomes large.

The size of the helical coil 100 increases due to the large proportion of the filling 102, and the diameter of the high-voltage winding 2 increases under the influence of the helical coil 100. As a result, the weight of the transformer increases and the price increases. There is a problem. An object of the present invention is to solve such a problem and to provide a dislocation conductor helical coil in which a required dislocation space is reduced and a cross-sectional area is smaller than that in the related art.

[0018]

According to the present invention, there is provided a conductor bundle formed by arranging two conductors composed of dislocation conductors in an axial direction and stacking a plurality of the conductors in a radial direction. Are arranged in the axial direction at a time and wound by a predetermined number of turns, and a plurality of dislocation portions are provided at predetermined positions for performing a transposition that changes the relative position of each conductor constituting the conductor bundle so as to rotate. In the dislocation conductor helical coil, the dislocation space required for dislocation in the dislocation portion is formed by extending the interval between the axially upper conductor and the axially lower conductor of the conductor bundle in the axial direction. I do.

[0019]

In the structure of the present invention, the dislocation space is formed by widening the gap between the conductor on the upper stage in the axial direction and the conductor on the lower stage in the axial direction of the conductor bundle in the axial direction. Since it is sufficient to secure this dislocation space only for the turns provided, when the number of conductors constituting the conductor bundle is small due to the use of the dislocation conductor, the helical coil is compared with the conventional configuration where the dislocation space is provided for the entire conductor bundle. The dislocation space integrated as a whole can be small.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is a cross-sectional view of a dislocation portion which transitions from block 11 to block 12 of a helical coil 100 according to an embodiment of the present invention. The same members as those in FIG. In this figure, position a corresponds to position a in FIG.
8 represents the conductor position before the dislocation, and the position h is the position g in FIG.
This is the position where the dislocation has been completed as in the case of. Position b is the conductor numbers 1, 2, 2,
This is a position where the cooling duct 103 is expanded between the conductor numbers 3, 4, and the conductor numbers 5, 6, 7, and 8 below, and thereafter, the conductor is moved in the axial direction and the radial direction as in the conventional case. Hereinafter, the dislocation according to this figure will be described step by step starting from position a. The dislocation space 106 is provided so as to widen the interval between the cooling ducts 103 in the conductor bundle 115, and the position becomes the position b. The conductor number 8 is moved in the axial direction to the dislocation space 106 to become the dislocation conductor position C. The conductor numbers 5, 6, and 7 are moved to the inner diameter side in the radial direction to become the position d. The conductor number 4 is moved downward in the axial direction to become the position e. The conductor numbers 1, 2, and 3 are moved to the outer diameter side in the radial direction to be the position f. After the conductor number 1 is moved, the conductor number 8 is axially moved to the position g. The dislocation space 106 is closed and returned to the cooling duct 103 to be located at the position h.
Move to

If such a dislocation is employed, the pad 102 as shown in FIGS. 5 and 8 is not required. Therefore, the coil width, which is also the radial dimension of the helical coil 100, is four times the thickness q of the conductor 101. Is fine. In the conventional helical coil 100 shown in FIG. On the other hand, the height dimension, which is the axial dimension of the helical coil 100, is larger than the conventional dimension by the provision of the dislocation space 106. Assuming that the width dimension of the conductor 101 is p and the cooling duct dimension is s, the increase in the height dimension is seven times (ps). The number of turns N, the number of conductor bundles m, the height dimension P ₁ of the conventional helical coil 100, the width dimension Q ₁ , the cross-sectional area S ₁ ,
When the coil height P ₂ of the helical coil 100 of the invention, the width dimension Q ₂ , the cross-sectional area S ₂ , and the ratio of the cross-sectional area S ₂ to the cross-sectional area S ₁ are η, the following equations are obtained. The number of the conductor bundles in the axial direction in the helical coil 100 is a value obtained by adding +1 to the number of turns N. This can be understood from the fact that the end of the first turn is displaced in the axial direction by one turn from the start end, and thus requires an axial dimension of two turns. P ₁ = (N + 1) (p + p) + (2N + 1) s {(1) Q ₁ = (m / 2 + 1) q} ‥‥‥‥‥‥‥ (2) S ₁ = P ₁ Q ₁ ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ (3) P ₂ = (N + 1) (p + p) + (2N + 1) s + (m-1) (q-s) ‥‥ (4) Q 2 = (m / 2) q ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ ‥‥‥‥ (5) S ₂ = P ₂ Q ₂ ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ (6) η = S ₂ / S ₁ = ( P ₂ / P ₁ ) (Q ₂ / Q ₁ ) ‥‥‥‥‥‥‥‥‥ (7) = [1+ (m−1) (q−d) / P ₁ ] × [1-2 / (m + 2) )] ‥ (8) The values of N and m are 40 and 8, which are the values in FIG. 4, and p = q = 1
When the above equation is calculated with 5 mm and d = 5 mm, the following is obtained. P1 = 41 · (15 + 15) + 81.5 = 1635 1 Q1 = (8/2 + 1) · 15 = 75 S1 = 1635 · 75 = 1.226 × 10 ⁵ P2 = 41 · (15 + 15) + 81.5 + 7 (15 °)
5) = 1705 Q2 = (8/2) · 15 = 60 S2 = 1705 · 60 = 1.023 × 10 ⁵ η = 1.23 · 10 ⁵ /1.226×10 ⁵ = 0.8
3 That is, the helical coil 100 to which the present invention is applied is reduced to a cross-sectional area of 83% of the conventional helical coil 100. The reduction in the cross-sectional area means that the winding width can be reduced by making the winding height the same, so that the average diameter of the low-voltage winding 1 composed of the helical coil 100 employing the present invention is reduced and the high-voltage winding is reduced. By reducing the diameter of 2, the amount of conductor used for these windings is reduced, so that not only the cost is reduced, but also the load loss is reduced at the same ratio and the efficiency is improved. Further, since the outer diameter of the entire winding is reduced, ripple effects such as a reduction in the dimensions of the transformer, a reduction in the size and weight of the iron core and the tank, and a reduction in the amount of insulating oil used as a cooling medium are produced.

The equation (8) is approximately given by the following equation. From this equation, m where η <1 at which the effect of the present invention occurs is obtained.
Is obtained as follows. η ≒ 1 + (m−1) (q−d) / P _1-2 − (m + 2) <1 (9) (m−1) (m + 2) <2P ₁ / (q−d) ‥‥‥‥‥‥‥‥‥‥ (10) By substituting the above values, the right side of the equation (10) becomes 327. Therefore, when m is obtained from this, m <18 is obtained. That is, since m is an even number, when the number is 16 or less, the sectional area of the helical coil 100 can be reduced by applying the present invention. As described above, m = 8 results in a reduction of about 17% as described above. As described above, when the conductor is not a dislocation conductor but a rectangular wire, the value of m becomes large, so that the effect of the present invention may not be obtained or the helical coil cross-sectional area may be increased.

The order of the dislocations in the dislocation portion in FIG. 1 is an example, and the order of the dislocations is not limited to this diagram in applying the present invention. For example, when moving from position a to position b, it is also possible to move only three conductor numbers 5, 6, and 7 to the same position as position c, and then move conductor 8 to position c. This means that from position e to position h
The same applies to the case of moving to. Further, the dislocation space 106 is not provided only in the conductor bundle, and the cooling duct 103 between the conductor bundles 111 and 112 is enlarged in a portion other than the one-turn dislocation portion where the dislocation portion exists. Can also.

[0024]

According to the present invention, as described above, the dislocation space is
The dislocation space may be provided only in the turn where the dislocation part is provided by adopting a configuration in which the interval between the conductor on the upper stage in the axial direction and the conductor on the lower stage in the axial direction of the conductor bundle is formed by extending in the axial direction. In addition, since the number is a value obtained by subtracting 1 from the number of conductors constituting the conductor bundle, when the number of conductors constituting the conductor bundle is small, such as a displaced conductor helical coil, the dislocation space is reduced to the entire conductor bundle as in the conventional case. The dislocation space integrated over the entire helical coil is smaller than that provided, and the cross-sectional area of the helical coil can be reduced accordingly. As a result, not only does the average diameter of the low-voltage winding formed by the helical coil decrease, but also the diameter of the high-voltage winding located on the outer diameter side of the low-voltage winding decreases, and the amount of conductor used by each winding decreases And the efficiency is improved by cost reduction and load loss reduction. Furthermore, since the diameter of the entire winding is reduced, the size and weight of the iron core and tank are reduced, and these are combined to greatly reduce the cost, improve efficiency, and save resources of large-capacity transformers using displaced conductor helical coils. The effect of contributing is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the position of each conductor in a dislocation portion of a helical coil according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a winding cross-sectional arrangement and a leakage magnetic flux distribution of a transformer.

FIG. 3 is a graph showing the distribution of the magnetic flux density of the leakage magnetic flux along the line AA in FIG. 2;

FIG. 4 is a schematic sectional view showing a helical coil conductor arrangement.

FIG. 5 is a cross-sectional view of the upper two conductor bundles in the uppermost block of FIG. 2;

FIG. 6 is a detailed sectional view of a dislocation conductor constituting the conductor bundle of FIG. 5;

FIG. 7 is a perspective view schematically showing a state of dislocation in a conventional dislocation portion.

FIG. 8 is a sectional view showing the position of each conductor at each position in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-voltage winding 2 High-voltage winding 3 Iron core 100 Helical coil 101 Conductor (dislocation conductor) 103 Cooling duct 106 Dislocation space 11 block 111 conductor bundle 112 conductor bundle 115 conductor bundle 12 block 121 conductor bundle

Claims (1)

(57) [Claims] A conductor (101) composed of dislocation conductors is arranged in the axial direction, two conductor bundles (111 to 181) formed by stacking a plurality of these conductors in the radial direction are collectively arranged in the axial direction, and a predetermined The conductor bundle (111 to 181)
In a dislocation conductor helical coil in which a plurality of dislocation portions for performing transposition in which the relative position of each conductor (101) constituting
Dislocation space required for dislocation in the dislocation portion (106)
Wherein the distance between the conductor (101) on the upper side in the axial direction and the conductor (101) on the lower side in the axial direction of the conductor bundles (111 to 181) is increased in the axial direction. Conductor helical coil.