JP6429815B2 - Stationary inductor - Google Patents

Description

  The present invention relates to a static inductor, and more particularly, to a static inductor that cools a winding with a refrigerant.

  Japanese Patent Application Laid-Open No. 2012-19026 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2012-69621 (Patent Document 2) are prior art documents that disclose the configuration of a static inductor that cools a winding with a refrigerant.

  In the static inductor described in Patent Document 1, a gap is generated between the strands by arranging a spacer between the strands constituting the disk-shaped winding. A first refrigerant flow path through which a refrigerant flows is provided between the disk-shaped windings adjacent to each other. The gap generated between the strands becomes a second refrigerant flow path that passes the refrigerant across the disk-shaped winding, and communicates with the first refrigerant flow path.

  In the static inductor described in Patent Document 2, both inner and outer ends of the disk-shaped winding are covered with an insulator. The insulator is provided with a second insulating spacer for securing the refrigerant flow path.

JP 2012-19026 A JP 2012-69621 A

  In the disk-shaped winding, both the inner and outer ends covered with the insulator have a small contact area with the refrigerant, and are thus not easily cooled and easily generate heat. The static inductors described in Patent Documents 1 and 2 have room for improvement from the viewpoint of cooling both the inner and outer ends covered with the insulator.

  The present invention has been made in view of the above-described problems, and can effectively cool both the inner peripheral side and the outer peripheral side of the disc-shaped winding covered with the insulator. An object of the present invention is to provide a static inductor that can be used.

  The stationary inductor according to the present invention is configured by winding a plurality of disk-shaped windings arranged on the same axis and wound around each of the plurality of disk-shaped windings. A plurality of insulators covering the surface of the outer peripheral wire and the inner peripheral wire located on the inner periphery, a plurality of insulating plates respectively positioned between the disk-shaped windings adjacent to each other in the axial direction, A plurality of first insulating spacers that are positioned between disk-shaped windings and insulating plates adjacent to each other in the axial direction and that define first flow paths through which the refrigerant flows between the disk-shaped windings and the insulating plates And in each of the plurality of disk-shaped windings, between the strands located on the inner side of the outer strand and the outer strand, and on the outer sides of the inner strand and the inner strand And a second flow path through which the refrigerant flows so as to penetrate each of the plurality of disk-shaped windings in the axial direction. And a plurality of second insulating spacer. Each of the plurality of insulators covers either the surface of the outer peripheral wire or the surface of the inner peripheral wire. In each of the plurality of disk-shaped windings, the plurality of second insulating spacers are spaced from each other along the entire circumference of the inner peripheral surface of the outer peripheral wire and the entire outer periphery of the inner peripheral wire. Is located. The first channel and the second channel communicate with each other.

  ADVANTAGE OF THE INVENTION According to this invention, the edge part of both the inner peripheral side and outer peripheral side which are covered with the insulator in a disk shaped coil | winding can be cooled effectively.

It is a perspective view which shows the structure of the outer iron type | mold transformer which is a stationary inductor which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the coil of the stationary inductor which concerns on Embodiment 1 of this invention. It is a perspective view which expands and shows a part of A section of FIG. It is the partial front view which looked at the A section of the coil shown in FIG. 2 from the arrow 1 direction. It is the partial rear view which looked at the A section of the coil shown in FIG. 2 from the arrow 2 direction. It is sectional drawing which looked at a part of coil of FIG. 4 from the VI-VI line arrow direction. It is a perspective view which shows the external appearance of the insulator of the stationary inductor which concerns on Embodiment 1 of this invention. It is the figure which looked at a part of coil of Drawing 6 from the direction of arrow 1. The temperature distribution of the disk-shaped winding in the static inductor according to the first embodiment of the present invention is compared with the temperature distribution of the disk-shaped winding in the stationary inductor of the comparative example in which the second insulating spacer is not arranged. It is a graph to show. It is sectional drawing which shows a part of coil of the static inductor which concerns on the modification of Embodiment 1 of this invention. It is a perspective view which shows the structure of the coil of the stationary inductor which concerns on Embodiment 2 of this invention. It is a partial front view which expands and shows the A section of the coil shown in FIG. It is sectional drawing which looked at a part of coil of FIG. 12 from the XIII-XIII line arrow direction. It is sectional drawing which looked at a part of coil of FIG. 12 from the XIV-XIV line arrow direction.

  Hereinafter, stationary inductors according to embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a perspective view showing the configuration of a shell-type transformer that is a stationary inductor according to Embodiment 1 of the present invention. In FIG. 1, a part of each configuration is cut out. As shown in FIG. 1, the stationary inductor 100 according to the first embodiment of the present invention includes an iron core 110, a coil 120 wound around the iron core 110, a tank 130 that houses the iron core 110 and the coil 120, and a tank 130. Insulating oil (not shown) filled in the core 110 and the coil 120 is provided.

  The iron core 110 is composed of a plurality of laminated magnetic steel plates. In the present embodiment, two rectangular parallelepiped iron cores 110 having openings at the center are arranged adjacent to each other.

  The coil 120 is wound around the legs of the two iron cores 110 adjacent to each other so as to penetrate the openings of the iron cores 110. The coil 120 is configured to sandwich the high voltage side coil between the low voltage side coils in the axial direction of the coil 120.

  The insulating oil serves as both an insulating medium and a cooling medium. The insulating oil is pressurized by a pump so as to circulate in the tank 130, and flows around the iron core 110 and the coil 120. In this embodiment, mineral oil is used as the insulating oil, but ester oil or the like may be used as the insulating oil. In the middle of circulation, the insulating oil is sent to a radiator provided with a fan to be cooled. The temperature of the insulating oil is usually 20 ° C. or higher and 100 ° C. or lower.

  FIG. 2 is a perspective view showing the configuration of the coil of the stationary inductor according to the first embodiment of the present invention. FIG. 3 is an enlarged perspective view showing a part of A part of FIG. 2 and 3, the width direction of the coil is indicated by the X-axis direction, the height direction of the coil is indicated by the Y-axis direction, and the axial direction of the coil is indicated by the Z-axis direction. In FIG. 2, an insulator to be described later is not shown.

  As shown in FIGS. 2 and 3, the coil 120 of the stationary inductor according to the first embodiment of the present invention includes a plurality of disk-shaped windings 10 arranged coaxially in the Z-axis direction. Each of the high voltage side coil and the low voltage side coil includes a plurality of disk-shaped windings 10. In each of the high voltage side coil and the low voltage side coil, the inner peripheral ends or the outer peripheral ends of the disc-shaped windings 10 adjacent to each other are electrically connected. The outer dimensions of the coil 120 are, for example, a width of about 1500 mm and a height of about 3000 mm.

  The plurality of disk-shaped windings 10 are each configured by winding an element wire 11. The strand 11 has a structure in which the periphery of the copper wire is covered with insulating paper such as kraft paper. The strand 11 is wound from the inner peripheral side toward the outer peripheral side.

  In each of the plurality of disk-shaped windings 10, a portion located on the inner periphery is an inner peripheral wire 11a, and a portion located on the outer periphery is an outer peripheral wire 11b. In the disk-shaped windings 10 adjacent to each other, when the inner peripheral ends are electrically connected, a relatively large potential difference is generated between the outer peripheral wires 11b, and the outer peripheral ends are electrically connected to each other. When connected to each other, a relatively large potential difference is generated between the inner peripheral wires 11a.

  The coil 120 further includes a plurality of second insulating spacers 12. In each of the plurality of disk-shaped windings 10, the plurality of second insulating spacers 12 are positioned so as to be sandwiched between the strands 11 located inside the outer peripheral strand 11 b and the outer peripheral strand 11 b. The plurality of second insulating spacers 12 are positioned at intervals from each other along the entire circumference of the inner peripheral surface of the outer peripheral wire 11 b in each of the plurality of disk-shaped windings 10.

  Similarly, the plurality of second insulating spacers 12 are sandwiched between the strand 11 and the inner strand 11a located outside the inner strand 11a in each of the plurality of disk-shaped windings 10. positioned. The plurality of second insulating spacers 12 are positioned at intervals from each other along the entire circumference of the outer peripheral surface of the inner peripheral wire 11 a in each of the plurality of disk-shaped windings 10.

  Each of the plurality of second insulating spacers 12 has a rectangular parallelepiped outer shape. Each of the plurality of second insulating spacers 12 is constituted by a press board. However, the material of the second insulating spacer 12 is not limited to the press board, and may be an insulating resin having oil resistance. As for the external dimensions of each of the plurality of second insulating spacers 12, for example, the circumferential width of the disk-shaped winding 10 is 5 mm or more and 30 mm or less, and the radial thickness of the disk-shaped winding 10 is 2 mm or more. 10 mm or less. The radial thickness of the disk-shaped winding 10 is preferably 4 mm or more and 8 mm or less. The arrangement interval of the plurality of second insulating spacers 12 is not less than 50 mm and not more than 100 mm. Each of the plurality of second insulating spacers 12 has a strength capable of withstanding a mechanical force acting between the strands 11 when the transformer is short-circuited.

  In each of the plurality of disk-shaped windings 10, the plurality of second insulating spacers 12 are arranged, so that the insulating oil flows through each of the plurality of disk-shaped windings 10 in the Z-axis direction. A second flow path 10t is defined. In each of the plurality of disk-shaped windings 10, the second flow path 10t is provided along each of the entire circumference of the outer peripheral wire 11b and the entire circumference of the inner peripheral wire 11a. Thereby, the contact area of each of the outer peripheral wire 11b and the inner peripheral wire 11a and the insulating oil can be sufficiently ensured.

  Since the plurality of second insulating spacers 12 are disposed when the wire 11 is wound from the inner peripheral side, the plurality of second insulating spacers 12 can be easily disposed in each of the plurality of disk-shaped windings 10. Can do.

  FIG. 4 is a partial front view of the A part of the coil shown in FIG. FIG. 5 is a partial rear view of the A part of the coil shown in FIG. FIG. 6 is a cross-sectional view of a part of the coil of FIG. 4 as seen from the direction of arrows VI-VI. FIG. 7 is a perspective view showing an appearance of an insulator of the stationary inductor according to the first embodiment of the present invention. FIG. 8 is a view of a part of the coil of FIG. In FIG. 8, an insulating plate to be described later is not shown.

  As shown in FIGS. 4 to 8, the coil 120 further includes a plurality of insulators 13. The plurality of insulators 13 cover the surface of the outer peripheral strand 11b and the surface of the inner peripheral strand 11a of each of the plurality of disk-shaped windings 10. Each of the plurality of insulators 13 covers either the surface of the outer peripheral wire 11b or the surface of the inner peripheral wire 11a.

  The plurality of insulators 13 covering the surface of the outer peripheral wire 11b are arranged at intervals in the circumferential direction of the outer peripheral wire 11b at the position of the outer peripheral end. The plurality of insulators 13 covering the surface of the inner peripheral wire 11a are arranged at intervals in the circumferential direction of the inner peripheral wire 11a at the position of the inner peripheral end.

  Each of the plurality of insulators 13 is constituted by a press board. However, the material of the insulator 13 is not limited to the press board, and may be an insulating resin having oil resistance.

  As shown in FIG. 6, each of the plurality of insulators 13 covers the outer peripheral surface of the outer peripheral wire 11 b, and the front and rear surfaces that are substantially perpendicular to the Z-axis direction, respectively. Each of the plurality of insulators 13 has a different radial length of the disk-shaped winding 10 on the side covering the front surface of the outer peripheral wire 11b and the side covering the back surface. Specifically, in each of the plurality of insulators 13 covering the surface of the outer peripheral strand 11b, between the outer peripheral strands 11b in which a relatively large potential difference occurs in the adjacent disk-shaped windings 10. The side located at the end extends toward the inside in the radial direction of the disk-shaped winding 10 until it covers the front or back surface of the strand 11 located inside the outer peripheral strand 11b. On the other hand, the side where the outer peripheral ends of the disk-shaped windings 10 adjacent to each other are electrically connected and the outer peripheral strands 11b are substantially at the same potential covers the front or back of the outer peripheral strand 11b. Up to the inner side of the disk-shaped winding 10 in the radial direction.

  Similarly, each of the plurality of insulators 13 covers the inner peripheral surface of the inner peripheral wire 11a and the front and back surfaces substantially perpendicular to the Z-axis direction. Each of the plurality of insulators 13 has a different length in the radial direction of the disk-shaped winding 10 on the side covering the front surface and the side covering the back surface of the inner peripheral wire 11a. Specifically, in each of the plurality of insulators 13 covering the surface of the inner peripheral wire 11a, the inner peripheral wires 11a in which a relatively large potential difference is generated in the disk-shaped windings 10 adjacent to each other. The side located between the two ends extends toward the outside in the radial direction of the disk-shaped winding 10 until it covers the front or back surface of the strand 11 located outside the inner peripheral strand 11a. On the other hand, in the disk-shaped windings 10 adjacent to each other, the side where the inner peripheral ends are electrically connected and the inner peripheral strands 11a are at substantially the same potential is the front of the inner peripheral strand 11a or The disk-shaped winding 10 extends toward the outside in the radial direction until the back surface is covered.

  As shown in FIG. 6, the coil 120 further includes a plurality of insulating plates 15 respectively positioned between the adjacent disk-shaped windings 10. Each of the plurality of insulating plates 15 has an annular outer shape corresponding to the shape of the disk-shaped winding 10 so as to face the disk-shaped winding 10. Each of the plurality of insulating plates 15 is configured by a press board. However, the material of the insulating plate 15 is not limited to the press board, and may be an insulating resin having oil resistance.

  As shown in FIGS. 6 and 8, the coil 120 further includes a plurality of first insulating spacers 14. The plurality of first insulating spacers 14 are located between the disk-shaped winding 10 and the insulating plate 15 adjacent to each other. A plurality of first insulating spacers 14 are located in a matrix between the disk-shaped winding 10 and the insulating plate 15 adjacent to each other with a space therebetween.

  Each of the plurality of first insulating spacers 14 is made of sulfate pulp. However, the material of the first insulating spacer 14 is not limited to sulfate pulp, and may be an insulating resin or press board having oil resistance. Each of the plurality of first insulating spacers 14 has a quadrangular prism-shaped outer shape that is a parallelogram in a front view.

  Since the plurality of first insulating spacers 14 are arranged, the disk-shaped winding 10 is interposed between the disk-shaped winding 10 and the insulating plate 15 adjacent to each other as indicated by a dotted line 9 in FIG. A first flow path 10u through which the insulating oil flows is defined. In each of the plurality of disk-shaped windings 10, the first flow path 10 u is provided along each of the front surface and the back surface of the disk-shaped winding 10.

  As shown in FIG. 6, the first flow path 10u and the second flow path 10t communicate with each other. As a result, a part of the insulating oil flowing in the first flow path 10u along each of the front surface and the back surface of the disk-shaped winding 10 is caused to flow into the second flow path 10t, and the entire circumference of the outer peripheral wire 11b. And it can be made to flow along each of the perimeter of the inner periphery strand 11a. As a result, it is possible to effectively cool each of the outer peripheral wire 11b and the inner peripheral wire 11a that are covered with the insulator 13 and easily generate heat.

  FIG. 9 shows the temperature distribution of the disk-shaped winding in the static inductor according to Embodiment 1 of the present invention, and the temperature distribution of the disk-shaped winding in the stationary inductor of the comparative example in which the second insulating spacer is not arranged. It is a graph shown in comparison with. In FIG. 9, the vertical axis indicates the temperature of the disk-shaped winding, and the horizontal axis indicates the radial position of the disk-shaped winding. Further, the temperature distribution of the disk-shaped winding in the stationary inductor according to the first embodiment of the present invention is indicated by a solid line, and the temperature distribution of the disk-shaped winding in the stationary inductor of the comparative example is indicated by a dotted line.

As shown in FIG. 9, in the disk-shaped winding in the static inductor of the comparative example in which the second insulating spacer 12 is not arranged, both the inner peripheral side and the outer peripheral side covered with the insulator 13 are used. The temperature T ₂ at the end was high. On the other hand, in the disk-shaped winding 10 in the stationary inductor 100 according to the first embodiment of the present invention, the temperatures T ₁ at both the inner peripheral side and the outer peripheral side covered with the insulator 13 are: The temperature was maintained at the same temperature as other portions of the disk-shaped winding 10. From this, the stationary inductor 100 according to the present embodiment effectively uses both the inner and outer ends covered with the insulator 13 in each of the plurality of disk-shaped windings 10. It was confirmed that it was possible to cool down.

  In the static inductor 100 according to the present embodiment, since the maximum temperature of the disk-shaped winding 10 can be reduced, the life of the disk-shaped winding 10 can be extended. Further, in each of the plurality of disk-shaped windings 10, the ratio of the volume occupied by both the inner peripheral side and the outer peripheral end is about 15%. By increasing the cooling efficiency of this part, the amount of insulating oil is increased. Thus, the stationary inductor 100 can be reduced in size. In addition, although the static induction device 100 which concerns on this embodiment had the structure which circulates insulating oil forcibly using a pump, you may have the structure which circulates insulating oil by natural convection.

  Here, a stationary inductor according to a modification of the first embodiment of the present invention will be described. FIG. 10 is a cross-sectional view showing a part of a coil of a static inductor according to a modification of the first embodiment of the present invention. In FIG. 10, the part corresponding to the two disk-shaped windings 10 is shown in the same sectional view as FIG.

  As shown in FIG. 10, in the coil of the static inductor according to the modification of the first embodiment of the present invention, each of the plurality of insulating plates 15 is the first of the disk-shaped windings 10 adjacent to each other. An opening 15h that allows the second flow path 10t to communicate with each other is provided in a portion located between the two flow paths 10t. The opening 15h is in the vicinity of the position between the outer peripheral wires 11b where the outer peripheral ends of the disc-shaped windings 10 adjacent to each other are electrically connected and have substantially the same potential, or between the inner peripheral ends. Are provided in the vicinity of a position between the inner peripheral wires 11a that are electrically connected and have substantially the same potential.

  By providing the openings 15 h in each of the plurality of insulating plates 15, the pressure loss in the flow path of the insulating oil is reduced, and the temperature between the disk-shaped windings 10 in the plurality of disk-shaped windings 10 is reduced. The difference can be reduced.

(Embodiment 2)
Hereinafter, a stationary inductor according to Embodiment 2 of the present invention will be described with reference to the drawings. Note that the static inductor according to the second embodiment of the present invention is different from the static inductor 100 according to the first embodiment of the present invention only in the shape of the insulator, and thus is the same as the static inductor 100 according to the first embodiment of the present invention. The description of the configuration will not be repeated.

  FIG. 11 is a perspective view showing the configuration of the coil of the stationary inductor according to the second embodiment of the present invention. FIG. 12 is a partial front view showing the A portion of the coil shown in FIG. 11 in an enlarged manner. 13 is a cross-sectional view of a part of the coil shown in FIG. 12 as viewed from the direction of arrows XIII-XIII. 14 is a cross-sectional view of a part of the coil shown in FIG. 12 as viewed from the direction of arrows XIV-XIV. In FIG. 11, the insulator is not shown.

  As shown in FIGS. 11 to 14, the coil 220 of the stationary inductor according to the second embodiment of the present invention includes a plurality of insulators 23. The plurality of insulators 23 cover the surface of the outer peripheral wire 11b and the surface of the inner peripheral wire 11a of each of the plurality of disk-shaped windings 10. Each of the plurality of insulators 23 covers either the surface of the outer peripheral wire 11b or the surface of the inner peripheral wire 11a.

  Each of the plurality of insulators 23 is configured by a press board. However, the material of the insulator 23 is not limited to the press board, and may be an insulating resin having oil resistance.

  As shown in FIGS. 12 to 14, each of the plurality of insulators 23 covers the outer peripheral surface of the outer peripheral wire 11 b and the front and back surfaces substantially perpendicular to the Z-axis direction. In each of the plurality of insulators 23, the length in the radial direction of the disk-shaped winding 10 is alternately different in the circumferential direction of the disk-shaped winding 10.

  Specifically, in each of the plurality of insulators 23 covering the surface of the outer peripheral wire 11b, as it goes along the circumferential direction of the disk-shaped winding 10, the outer peripheral wire 11b is shown in FIG. A portion extending toward the inner side in the radial direction of the disk-shaped winding 10 until the front surface or the back surface of the element wire 11 located inside is covered, and the front surface of the outer peripheral element wire 11b as shown in FIG. The portions extending inward in the radial direction of the disk-shaped winding 10 until the back surface is covered are alternately positioned.

  Similarly, in each of the plurality of insulators 23 covering the surface of the inner peripheral wire 11a, the element positioned outside the inner peripheral wire 11a as it goes along the circumferential direction of the disk-shaped winding 10. The portion of the disc-like winding 10 extending toward the outside in the radial direction until the front or back surface of the wire 11 is covered, and the disc-like winding 10 until the front or back surface of the inner peripheral wire 11a is covered. The portions extending outward in the radial direction are alternately located.

  Since each of the plurality of insulators 23 has the above shape, the area of the communication portion between the first flow path 10u and the second flow path 10t is compared with that of the static inductor 100 according to the first embodiment of the present invention. Can do a lot. Thereby, the quantity of the insulating oil which flows into the 2nd flow path 10t can be increased. As a result, it is possible to effectively cool each of the outer peripheral wire 11b and the inner peripheral wire 11a that are covered with the insulator 23 and easily generate heat.

  Each of the plurality of insulators 23 sandwiches the wire 11 positioned inside the outer peripheral wire 11b or the wire 11 positioned outside the inner peripheral wire 11a. It can be fixed stably. As a result, the insulator 23 can be prevented from falling off the disk-shaped winding 10 when the plurality of disk-shaped windings 10 are arranged on the same axis.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. In addition, meanings equivalent to the claims and all modifications within the scope are included.

  10 disc-shaped winding, 10t second channel, 10u first channel, 11 strand, 11a inner strand, 11b outer strand, 12 second insulation spacer, 13, 23 insulator, 14 first insulation Spacer, 15 Insulating plate, 15h Opening, 100 Stationary inductor, 110 Iron core, 120, 220 Coil, 130 Tank.

Claims (3)

A plurality of disk-shaped windings, each of which is constituted by winding a wire, and are arranged on the same axis,
A plurality of insulators covering the surface of the outer peripheral wire located on the outer periphery of each of the plurality of disk-shaped windings and the surface of the inner peripheral wire located on the inner periphery;
A plurality of insulating plates respectively positioned between disk-shaped windings adjacent to each other in the axial direction;
A plurality of first passages that are respectively positioned between the disk-shaped winding and the insulating plate that are adjacent to each other in the axial direction and that define a first flow path through which the refrigerant flows between the disk-shaped winding and the insulating plate. An insulating spacer;
In each of the plurality of disk-shaped windings, a wire positioned between the outer peripheral wire and the outer peripheral wire, and a wire positioned outside the inner peripheral wire and the inner periphery A plurality of second insulating spacers that are located between the strands and that define second flow paths through which the refrigerant flows so as to penetrate each of the plurality of disk-shaped windings in the axial direction;
Each of the plurality of insulators covers either the surface of the outer peripheral wire or the surface of the inner peripheral wire,
In each of the plurality of disk-shaped windings, the plurality of second insulating spacers are arranged along the entire circumference of the inner peripheral surface of the outer peripheral wire and the entire outer periphery of the inner peripheral wire. Are located at a distance from each other,
A stationary inductor in which the first channel and the second channel communicate with each other.   Each of the plurality of insulating plates has an opening communicating the second flow paths with each other in a portion located between the second flow paths facing each other of the disk-shaped windings adjacent to each other in the axial direction. The stationary inductor according to claim 1, wherein a portion is provided. The stationary inductor according to claim 1 or 2, wherein a thickness in a radial direction of the plurality of disk-shaped windings in each of the plurality of second insulating spacers is 4 mm or more and 8 mm or less.

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