JP2012069621A - Cooling structure in stationary induction apparatus and stationary induction apparatus with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure in a stationary induction apparatus, composed of discoid coils, which permits cooling performance to be increased over a conventionally available one; and a stationary induction apparatus having the cooling structure.SOLUTION: In a cooling structure of a stationary induction apparatus comprised of discoid coils 31 and 32 which have a different coil-to-coil distance between the inner and the outer peripheries and which are laminated via an insulating plate 101, there are provided duct pieces 102-1 and 102-2 forming coolant passages 181 and 182 interposed between the discoid coils and the insulating plate, which have a constant thickness in a single unit and come in plural types having different thicknesses between different types. The duct pieces differing in thickness are disposed in a radial direction in order for the heights of the coolant passages to differ in the radial direction.

Description

  The present invention relates to a cooling structure in a static inductor such as a transformer, a reactor or the like constituted by a disk-shaped winding, and a static inductor having this cooling structure.

  In a static inductor provided with a transformer including a winding and an iron core, the transformer is disposed in the outer box, and the transformer is cooled with a refrigerant such as insulating oil. There are two types of transformers, the outer iron type and the inner iron type, depending on the structure of the winding and the iron core. In the outer iron type, the magnetic path passes through the outside of the winding. A magnetic path passes through the inside of the winding. Moreover, as a structure of a coil | winding, there exists a form of a multiple cylindrical coil | winding and a disk shaped coil | winding. The multiple cylindrical winding is formed by winding a wire in a cylindrical shape to form one conductor layer, and arranging a cylindrical conductor layer having a larger diameter on the outer peripheral side of the conductor layer. It has a structure in which larger-diameter cylindrical conductor layers are arranged concentrically. On the other hand, in the disk-shaped winding, the wire is concentrically wound to form one plate-like conductor layer, and the next plate-like conductor layer formed in the same shape as this plate-like conductor layer is coaxially formed. In the same manner, it has a structure in which plate-like conductor layers having the same shape are laminated.

  For example, Patent Document 1 describes a static inductor having multiple cylindrical windings. In this static inductor, the outer circumference of the inner conductor layer and the outer conductor layer between the cylindrical conductor layers constituting the multiple cylindrical winding, that is, in two adjacent cylindrical conductor layers, A refrigerant flow path for allowing a cooling refrigerant to flow is provided between the inner circumference and the inner circumference. Thus, in the structure having the multiple cylindrical windings, the refrigerant flow path extends along the axial direction of each of the cylindrical conductor layers, and the refrigerant is wound in this axial direction, that is, the element wound around the axial direction. It will flow in a direction perpendicular to the direction in which the line extends.

  Furthermore, for each cylindrical conductor layer, the gap between the conductor layers is reduced in the portion where the potential difference generated between the conductor layers is small in the end portions of the multiple cylindrical windings in the axial direction, whereas the portion where the potential difference is large Then, each conductor layer is arranged with a large gap. That is, the multiple cylindrical winding is formed so that the cross-sectional area of the refrigerant flow path changes along the direction in which the refrigerant flows. In order to constitute such a refrigerant flow path, a rod-shaped duct piece is extended along the axial direction between conductor layers, and the thickness of the duct piece is changed stepwise along the axial direction.

Japanese Patent No. 3933347

On the other hand, the outer iron type transformer having a disk-shaped winding, which is schematically shown in FIG. 12, has the following configuration as an example.
That is, the winding 3 is formed by the disc-shaped windings 3-1 and 3-2 of the disc-shaped winding configured as described above, and the iron core 6 is disposed outside the winding 3. . Here, the disk-shaped winding 3-1 is a primary winding, the disk-shaped winding 3-2 is a secondary winding, and the disk-shaped windings 3-1, 3-2 are respectively A plurality of disk-shaped windings are provided, and these are stacked along the stacking direction 91 to form the winding 3. Depending on the application, a tertiary winding may be used, and there is a horizontal type in which the winding 3 illustrated in the vertical direction in FIG. 12 is rotated 90 °.

  FIG. 13 shows two disk-shaped windings 31 and 32 facing each other for the winding 3. Normally, adjacent disk-shaped windings are connected to each other on the inner peripheral side 4 or the outer peripheral side 5 of the disk-shaped windings. Below, it describes about the case where it connects on the inner peripheral side 4. FIG.

FIG. 14 shows a cross-sectional structure between the disk-shaped windings 31 and 32 in a region I indicated by a dotted line in FIG. As described above, each of the disk-shaped windings 31 and 32 is formed by winding the strand 15 concentrically in the radial direction 92 from the inner peripheral side 4 to the outer peripheral side 5. The radial direction 92 is a direction in which the strand 15 is wound concentrically and corresponds to the direction toward the inner peripheral side 4 and the outer peripheral side 5.
Further, from the viewpoint of the electrical insulation performance between the disk-shaped windings, the disk-shaped windings 31 and 32 are connected on the inner peripheral side 4 in the present example. The potential difference between 31 and 32 is small. Therefore, the gap between the disk-shaped windings in the stacking direction 91 (hereinafter referred to as “distance between the disk-shaped windings”) may be relatively small on the inner peripheral side 4, while Since the potential difference between the plate windings 31 and 32 is large, it is necessary to relatively increase the distance 41 between the disk windings. Therefore, the disk-shaped winding 31 and the disk-shaped winding 32 are arranged with different distances 41 between the disk-shaped windings on the inner peripheral side 4 and the outer peripheral side 5 as shown in the figure. .

  Further, since the corners of the disk-shaped windings on both the inner peripheral side 4 and the outer peripheral side 5 are likely to be discharge starting points, the winding end portions are covered with the winding end insulating material 7. Furthermore, the electrical insulation is reinforced by inserting an insulating plate 16 between the iron core 6 whose potential is zero or the casing of the transformer and the winding end. Further, on the inner peripheral side 4 where the potential difference is small, winding end spacers 10 made of an insulating material are disposed on the respective winding end insulating materials 7 in the disk-shaped windings 31 and 32. This winding edge part spacer 10 becomes a member for ensuring the refrigerant | coolant flow path demonstrated below.

  FIG. 15 is an enlarged view of a region II indicated by a dotted line in FIG. In order to ensure electrical insulation between the disk-shaped winding 31 and the disk-shaped winding 32, the insulating plate 1 faces the entire surface of the opposing surfaces 31 a, 32 a of the disk-shaped windings 31, 32. 1 is inserted respectively. Here, each insulating plate 1, 1 is disposed with a gap provided between the opposing surfaces 31 a of the disk-shaped winding 31 and with a clearance provided between the opposing surfaces 32 a of the disk-shaped winding 32. Such a gap becomes a refrigerant flow path 18 through which a refrigerant, for example, insulating oil for cooling, passes. In order to secure such a refrigerant flow path 18, the duct piece 2 made of an insulating material is sandwiched between the insulating plates 1, 1 and the disk-shaped windings 31, 32 (specifically, the opposing surfaces 31 a, 32 a). Thus, they are discontinuously arranged in the radial direction 92. Here, all the duct pieces 2 have the same thickness.

  Thus, when forming the coil | winding 3 using the disk shaped windings 31 and 32, as FIG.14 and FIG.15 shows, the refrigerant | coolant flow path 18 is the extension direction 93 (FIG. 14 and FIG. 15, the refrigerant flows along the extending direction 93 of the strand 15. This is different from the structure in the case of the multiple cylindrical winding described above in which the refrigerant flows in a direction orthogonal to the extending direction of the strands.

  Further, in this example, the inner circumferential side 4 and the outer circumferential side 5 have different disc-shaped interwinding distances 41. In order to realize this structure, the inter-winding distance adjusting member 17 made of an insulating material and the taper spacer 9 made of an insulating material provided with a taper are arranged between the insulating plates 1 and 1 to form a duct piece. 2 is arranged on the opposite side. Here, in the disk-shaped windings 31, 32, the disk-shaped winding distance 41 is gently changed between the inner peripheral side 4 and the outer peripheral side 5, so that a large step is formed in the disk-shaped windings 31, 32. In order to prevent this from occurring, the insulating plates 1 and 1 and the inner peripheral side 4 of the inter-winding distance adjusting member 17 are tapered to gradually reduce their thickness.

  FIG. 16 shows the duct piece 2, the winding end spacer 10, and the winding end insulating material disposed on the opposing surface 32 a of the disk-like winding 32 in the portion indicated by the two-dot chain line in FIG. 14. 7 is a schematic view showing the positional relationship of FIG. As shown in the figure, the duct piece 2 has a parallelogram shape in plan view, and is arranged at a specified interval in the radial direction 92 and at a specified interval in the extending direction 93 of the strand 15. Therefore, the refrigerant flows in a zigzag manner in the extending direction 93 of the wire 15 in a portion where the duct piece 2 is not disposed in the refrigerant flow path 18 as indicated by a dotted line 19 in order to improve cooling efficiency.

  On the other hand, in the static inductor, a sudden force is applied to each disk-shaped winding, that is, the winding 3 at the time of a short circuit such as when power transmission is suddenly stopped due to a lightning strike or the like. When such an external force is applied, the winding 3 is supported by the casing of the static inductor via the duct piece 2, the insulating plate 1, the insulating material 7 for the winding end, and the iron core 6. Is done. As shown in FIG. 14, the disk-shaped winding, that is, the winding 3 is an aggregate of the strands 15 and does not cause extreme deformation by an external force. Therefore, it is necessary to support the strand 15. In the schematic diagram of FIG. 16, the strand maximum support interval 8 corresponds to the support interval.

  As described above, in the disk-shaped winding, unlike the case of the multiple cylindrical winding, the direction in which the refrigerant flows is the same as the extending direction of the strand 15. Therefore, in order to make the structure capable of forming the refrigerant flow path 18 while maintaining the maximum support distance 8 of the strands, the duct piece 2 is formed by a small member finely divided in the radial direction 92 as shown in FIG. ing. For example, when a long rod-shaped duct piece as disclosed in Patent Document 1 is used, there arises a problem that the flow of the refrigerant is blocked.

  Further, as disclosed in Patent Document 1, when trying to change the flow path height by forming a taper in the duct piece itself, the inner circumferential side 4 and the outer circumferential side 5 of the disk-shaped winding Between the positions, duct pieces are required in which the individual duct pieces themselves have a taper and the thickness of each duct piece is different. Therefore, there is a problem that the types of parts increase and cost effectiveness cannot be obtained.

  Moreover, as shown in FIG. 1 of Patent Document 1, when it is assumed that a large step is generated between the strands, the wire is wound around the strand at the step portion as described in Patent Document 1. This is not preferable because it causes damage to the insulating paper and reduces the dielectric strength.

  The present invention has been made to solve the above-described problems, and in a static inductor composed of disk-shaped windings, cooling in a static inductor that can improve the cooling capacity as compared with the prior art. It is an object of the present invention to provide a structure and a static inductor having the cooling structure.

In order to achieve the above object, the present invention is configured as follows.
That is, the cooling structure in a static inductor according to one aspect of the present invention is a cooling structure in a static inductor having a winding, and the winding is formed by concentrically winding strands in a radial direction. Each disk-shaped winding is laminated with the insulating member facing each disk-shaped winding formed, and the distance between the disk-shaped windings is different between the inner and outer circumferences of the winding. And a cooling structure in a stationary inductor having a refrigerant flow path that flows between the disk-shaped winding and the insulating member and flows the refrigerant in the extending direction of the element wire. This cooling structure is a duct piece that is sandwiched between the disk-shaped winding and the insulating member and regulates the height of the refrigerant flow path, and has a constant thickness by itself. A plurality of types of duct pieces having different thicknesses between types are provided, and the duct pieces having different thicknesses corresponding to the distance between the disk-shaped windings on the inner peripheral side and the outer peripheral side between the disk-shaped windings. Are discontinuously arranged in the radial direction, and different types of refrigerant flow path heights are formed in the radial direction.

  According to the stationary inductor cooling structure in one aspect of the present invention, the same type includes a plurality of types of duct pieces having the same thickness and different thicknesses between different types, and the duct pieces having different thicknesses are arranged with the diameter of the winding. Arranged in the direction. Therefore, the height of the refrigerant flow path in the winding can be varied in the radial direction, the refrigerant flow path can be enlarged compared to the conventional case, and the cooling performance of the winding can be improved. Moreover, compared with the structure which provides a taper in duct piece itself, the increase in the kind of duct piece can be suppressed significantly and it becomes possible to suppress the raise of manufacturing cost. Furthermore, the design does not cause a local large step in the winding, thereby preventing a decrease in insulation performance.

It is sectional drawing which shows the structure between the disk shaped windings which form the cooling structure in Embodiment 1 of this invention, and is sectional drawing of the area | region I shown in FIG. It is an enlarged view of the area | region III shown in FIG. It is a figure in the B view shown in FIG. It is a figure corresponding to FIG. 3, and is a figure for demonstrating the malfunction in the case of using the rectangular duct piece installation spacer. It is a top view of the insulating plate shown in FIG. 1, and a duct piece installation spacer, and is a figure for demonstrating the positional relationship of both. FIG. 2 is a schematic perspective view of a shell-type transformer provided with a winding having the disk-like winding structure shown in FIG. 1. FIG. 7 is a schematic perspective view of two opposing disk-like windings forming the winding shown in FIG. 6. It is sectional drawing which shows the structure between the disk shaped windings which forms the cooling structure in Embodiment 2 of this invention, and is sectional drawing of the area | region corresponded to the area | region I shown in FIG. It is an enlarged view of the area | region IV shown in FIG. It is a top view of the 1st insulating board and 2nd insulating board which are shown in FIG. 8, and is a figure for demonstrating the positional relationship of both. It is a figure for demonstrating the shape of the outer peripheral edge part of the 1st insulating board shown in FIG. It is a schematic perspective view of a shell type transformer. FIG. 13 is a schematic perspective view of two opposing disk-like windings forming the winding shown in FIG. 12. It is sectional drawing in the area | region I shown in FIG. It is an enlarged view of cool air II shown in FIG. It is a figure in the A view shown in FIG.

  A cooling structure in a stationary inductor according to an embodiment of the present invention and a stationary inductor having this cooling structure will be described below with reference to the drawings. In each figure, the same or similar components are denoted by the same reference numerals.

The cooling structure of the stationary inductor according to the present embodiment will be described below by taking the outer iron type transformer having the disk-shaped winding already described with reference to FIGS. 12 to 14 as an example. In addition, the stationary inductor having the above cooling structure is arranged such that an outer iron type transformer having the above cooling structure is arranged in an outer box containing a refrigerant such as insulating oil, and these transformers are cooled by the refrigerant. It has a possible structure.
Corresponding to FIGS. 12 and 13, FIG. 6 shows the outer iron type transformer 100 having the cooling structure in the present embodiment, and FIG. 7 shows the winding 103 provided in the outer iron type transformer 100. Show. In addition, regarding the basic configuration of the disk-shaped winding, the contents described above with reference to FIGS. 12 to 14 are referred to, and the same reference numerals are given to the same or similar components in the following description. Detailed explanation is omitted.

Embodiment 1 FIG.
One of the features of the cooling structure in the present embodiment is that a single duct piece has a uniform thickness, but has a plurality of types of duct pieces having different thicknesses between types. That is, in the winding 3 having the structure shown in FIG. 14, all the duct pieces 2 forming the refrigerant flow path 18 have the same thickness, and the height of the refrigerant flow path 18 is as shown in the figure. 3 is the same on the inner peripheral side 4 and the outer peripheral side 5. On the other hand, in the present embodiment, a portion having a plurality of types of duct pieces having different thicknesses and a relatively thick duct piece arranged can obtain a relatively large flow path cross section, and cooling performance in a stationary inductor. Can be improved.
Such a cooling structure in the present embodiment will be specifically described below.

  As described with reference to FIGS. 14 and 15, the disk-shaped windings 31 and 32 are formed, and these are stacked to form the winding 103 having the cooling structure of the present embodiment. FIG. 1 is a diagram corresponding to FIG. 14, and shows a cross-sectional structure between the disk-shaped windings 31 and 32 in the region I shown in FIG. 7 of the winding 103 in the outer iron type transformer 100. FIG. 2 is an enlarged view of a region III surrounded by a dotted line in FIG. Also in this embodiment, the case where the inner peripheral side 4 of the winding 103 is connected and the potential difference between the disk-shaped windings 31 and 32 becomes smaller on the inner peripheral side 4 is taken as an example. Since the potential difference is small on the inner circumferential side 4, the electrical insulation distance between the disk-shaped windings 31, 32 can be reduced, and the distance 41 between the disk-shaped windings on the inner circumferential side 4 is the disk shape on the outer circumferential side 5. Smaller than the interwinding distance 41. Therefore, cost reduction can be achieved.

  Similarly to the winding 3 shown in FIG. 14, also in the winding 103 according to this embodiment, the winding end insulating material 7 and the insulating plate 16 are provided at the winding end, and the inner peripheral side 4 is provided. Is provided with a winding end spacer 10. Further, the adjustment of the distance 41 between the disk-shaped windings on the inner peripheral side 4 and the outer peripheral side 5 is adjusted by the taper spacer 9 in the same manner as the structure shown in FIG. Can be changed.

  As in the case of the winding 3, in the winding 103, in order to ensure electrical insulation between the disc-like winding 31 and the disc-like winding 32, The insulating plates 101 are inserted so as to face the facing surfaces 31a and 32a. The insulating plate 101 is a plate made of an electrical insulating material having a shape corresponding to the disk-shaped windings 31 and 32, that is, a shape similar to the disk-shaped windings 31 and 32, and a shape as shown in FIG. In the first embodiment, the insulating plate 101 is of a single type and extends from the outer peripheral side 5 to the inner peripheral side 4 of the winding 103.

  Further, similarly to the structure shown in FIG. 14, a refrigerant flow path is formed between the insulating plates 101 and 101 and the disk-shaped windings 31 and 32 with a duct piece interposed therebetween. As described above, a plurality of types of duct pieces are provided. The duct piece will be described in detail below, and includes a thin duct piece having a relatively small thickness and one or more types of thick duct pieces having a thickness larger than that of the thin duct piece.

  Specifically, in this embodiment, as shown in FIG.1 and FIG.2, it is made of an insulating material and includes two kinds of duct pieces 102-1 and 102-2 having different thicknesses. Here, the thickness of each of the single piece of the duct piece 102-1 and the duct piece 102-2 is constant, and no taper is provided. In this embodiment, the disc-shaped interwinding distance 41 is set to be small on the inner peripheral side 4 and large on the outer peripheral side 5, so that the thin duct piece 102 having a relatively thin thickness is provided on the inner peripheral side 4. -1 is disposed, and a thick duct piece 102-2 having a thickness larger than that of the thin duct piece 102-1 is disposed on the outer peripheral side 5.

This will be described in more detail. In this embodiment, in the region 103 b on the outer peripheral side 5 in which the distance 41 between the disk-shaped windings is relatively large, each insulating plate 101, 101 is a coolant channel with respect to the opposing surface 31 a of the disk-shaped winding 31. The gap 182 is provided, and the gap 182 is provided with respect to the opposing surface 32 a of the disk-like winding 32, and the refrigerant flow path 182 is provided. In order to secure the refrigerant flow path 182 between the insulating plates 101 and 101 and the disk-shaped windings 31 and 32, respectively, the thick duct piece 102-2 includes the insulating plates 101 and 101 and the disk-shaped windings 31, 32 (specifically, facing surfaces 31a and 32a) and are discontinuously disposed in the radial direction 92. In addition, since each thick type duct piece 102-2 becomes the same thickness, the insulating plates 101 and 101 and the disk-shaped windings 31 and 32 are located in parallel, and the refrigerant flow path 182 The height is constant in the radial direction 92. In the present embodiment, the thick duct piece 102-2 is bonded to the insulating plate 101.
The thickness of the thick duct piece 102-2 and the height of the refrigerant flow path 182 correspond to the respective dimensions along the thickness direction of the plate-like disk-shaped windings 31 and 32.

  With this configuration, the distance 41 between the disk-shaped windings is increased. In this embodiment, on the outer peripheral side 5, the height of the refrigerant flow path 182 in the stacking direction 91 is increased compared to the structure shown in FIG. Cooling efficiency can be improved.

On the other hand, a duct piece installation spacer 111 is disposed on the inner peripheral side of the insulating plate 101 corresponding to the region 103a on the inner peripheral side 4 in the present embodiment where the distance 41 between the disk-shaped windings is small. As shown in FIG. 5, the duct piece installation spacer 111 is a plate-like member made of an insulating material similar in shape to the disk-shaped windings 31 and 32. As shown in FIGS. It is a member with a taper. That is, since the thin duct piece 102-1 is disposed on the inner peripheral side 4 as described above, there is a gap between the insulating plates 101 and 101 and the thin duct piece 102-1 as shown in FIG. Arise. The duct piece installation spacer 111 is a member corresponding to this gap. A gap formed by the thin duct piece 102-1 between the duct piece installation spacers 111 and 111 and the disk-shaped windings 31 and 32 serves as the refrigerant flow path 181. Since the height is defined by the thin duct piece 102-1, the height of the refrigerant flow path 181 is smaller than that of the refrigerant flow path 182. Further, each thin duct piece 102-1 has the same thickness, and the duct piece installation spacer 111 is tapered, so that the height of the refrigerant flow path 181 is constant in the radial direction 92. is there.
Note that the thickness of the thin duct piece 102-1 and the height of the refrigerant flow path 181 are the same as the thickness of the thick duct piece 102-2 and the height of the refrigerant flow path 182. It corresponds to each dimension along the thickness direction of 31 and 32.

  In the present embodiment, the thin duct piece 102-1 is bonded to the duct piece installation spacer 111, and the duct piece installation spacer 111 with the duct piece is bonded to the insulating plate 101 to form a disc-shaped winding. The distance between 31 and 32 is adjusted. In addition, in this embodiment, the duct piece installation spacer 111 with such a duct piece is bonded to the thin duct piece 102-1 on the duct piece installation spacer 111 provided with a taper in advance by an automatic bonding machine. It is made by cutting.

  Also in the thin duct piece 102-1, since it is not tapered like the thick duct piece 102-2, the increase in the number of parts of the duct piece can be suppressed, and the manufacturing cost can be suppressed. Become.

  FIG. 3 is a view corresponding to FIG. 16, and duct pieces 102-1 and 102-2 disposed on the facing surface 32 a of the disk-shaped winding 32 in the portion indicated by the two-dot chain line in FIG. 1. It is the figure which looked at the winding edge part spacer 10 and the insulating material 7 for winding edge parts in the arrow B direction, and is the schematic which shows these positional relationship. As shown in the figure, the duct pieces 102-1 and 102-2 are parallelograms, and are arranged at a specified interval in the radial direction 92 and at a specified interval in the extending direction 93 of the strand 15. ing. Further, the duct piece installation spacer 111 also has a shape in which at least one of the side 111a along the radial direction 92 and the end side 111b in the radial direction 92 is parallel to the corresponding side in the thin duct piece 102-2. ing. As shown in FIG. 4, when the duct piece installation spacer 111 is rectangular, it interferes with the thick duct piece 102-2, the winding end insulating material 7, and the winding end spacer 10. This is because a place is generated.

  In the present embodiment, for the sake of simplicity of explanation, the refrigerant flow path 180 has been described with a two-stage flow path configuration of the refrigerant flow path 181 and the refrigerant flow path 182, but it is cost effective. Can be multistaged within the allowable range. Incidentally, a plurality of types of duct piece installation spacers 111 are provided corresponding to this multi-stage.

  Further, when the windings on the outer peripheral side 5 are connected, the disc-shaped interwinding distance 41 on the outer peripheral side 5 is decreased, and the disc-shaped interwinding distance 41 on the inner peripheral side 4 is increased. In this case, the thin duct piece 102-1 and the duct piece installation spacer 111 are installed between the insulating materials 101 and 101 and the disk-shaped windings 31 and 32 on the outer peripheral side 5.

  As described above, according to the cooling structure of the present embodiment, it is possible to improve the cooling capacity of the static induction device as compared with the prior art, and it is possible to further obtain the following effects. That is, by improving the cooling capacity, the heat flux per disk-shaped winding can be increased, and the transformer size can be reduced. By reducing the size of the transformer, the weight and material cost can be reduced, and the transportation cost can also be reduced. In addition, cooling fans and pumps can be reduced, leading to energy savings.

Embodiment 2. FIG.
In the first embodiment described above, the duct piece installation spacers 111 and 111 are provided to one type of insulating plates 101 and 101 extending over almost the entire opposing surfaces 31a and 32a of the disk-shaped windings 31 and 32. The form of attachment was shown. On the other hand, in the winding 103-1 related to the second embodiment, as shown in FIG. 10, the first insulation is mainly arranged corresponding to the region 103 b having the larger disc-like interwinding distance 41. Two types of insulating plates are used: a plate 121 and a second insulating plate 122 that is disposed corresponding to the region 103a that has a smaller distance 41 between the disk-shaped windings. The second embodiment is different from the first embodiment in this point, and the other configuration of the transformer is the same as the configuration in the first embodiment. The second embodiment also has the same configuration as that of the first embodiment. As in the case, a duct piece having a plurality of types of thickness is provided. Therefore, also in the cooling structure of the stationary inductor in the second embodiment, the above-described effect exhibited by the cooling structure of the first embodiment can be achieved. The modification described in the first embodiment can also be applied to the cooling structure in the second embodiment.
Hereinafter, the above-described differences will be mainly described.

FIG. 8 is a view corresponding to FIG. 1 and shows a cross section of winding 103-1 related to the second embodiment in a region corresponding to region I shown in FIG. FIG. 9 is an enlarged view of region IV shown in FIG.
As described above, the winding 103-1 in this embodiment has two types of insulating plates, the first insulating plate 121 and the second insulating plate 122. The first insulating plate 121 is an electrically insulating plate-like member that is arranged corresponding to the side of the outer peripheral side 5 where the potential difference is large and has a relatively small thickness. As shown in FIG. The shape is similar to the shape of 1. The second insulating plate 122 is arranged on the inner peripheral side 4 on the side with a small potential difference, and has one or more kinds of thickness 122b larger than the maximum thickness 121b (FIG. 9) of the first insulating plate 121. 10 and has a shape similar to the shape of the winding 103-1. Further, as shown in FIG. 8, the first insulating plate 121 and the second insulating plate 122 have lengths corresponding to approximately half of the length in the radial direction 92 of the disk-shaped windings 31 and 32, respectively. The inner peripheral portion of the first insulating plate 121 and the outer peripheral portion of the second insulating plate 122 are overlapped, and the two are bonded together in this overlapping region 123 to form an integral insulating plate. The relatively thin first insulating plate 121 adjusts the distance between the windings in the overlapping region 123 by providing a taper in the vicinity of the overlapping region 123.

  Further, as shown in FIG. 11, the outer peripheral end 122a of the second insulating plate 122 positioned on the first insulating plate 121 side is formed in a zigzag shape corresponding to the arrangement of the thick duct piece 102-2, for example, by laser processing. Machined. By processing in this way, it is possible to prevent the outer peripheral end 122a from interfering with the thick duct piece 102-2.

  Further, the above-described thick duct piece 102-2 is arranged corresponding to the first insulating plate 121. That is, the thick duct piece 102-2 is sandwiched between the first insulating plates 121 and 121 and the disk-shaped windings 31 and 32 (specifically, the opposing surfaces 31a and 32a), and the refrigerant flow path 182 is formed. The Further, the above-described thin duct piece 102-1 is disposed corresponding to the second insulating plate 122. That is, the thin duct piece 102-1 is sandwiched between the second insulating plates 122 and 122 and the disk-shaped windings 31 and 32 (specifically, the opposing surfaces 31a and 32a), and the refrigerant flow path 181 is formed. .

  In this way, the first insulating plate 121 and the second insulating plate 122 are combined with the thick duct piece 102-2 and the thin duct piece 102-1, and the thickness of the first insulating plate 121 + the thick duct piece 102-2. The thickness of the second insulating plate 122 + the thickness of the thin duct piece 102-1 makes the contact surface of the duct pieces 102-1 and 102-2 in contact with the disk-shaped windings 31 and 32 flat. I have to.

In the stationary inductor cooling structure according to the second embodiment having the above-described configuration, the cooling capacity can be increased by expanding the flow path as in the first embodiment, and a steep step is generated in the winding portion. Without adjustment, the distance between the windings can be adjusted.
Furthermore, by bonding the first insulating plate 121 and the second insulating plate 122, it can be handled as a single insulating plate, and the dielectric strength can be maintained. Further, most of the thin duct piece 102-1 and the thick duct piece 102-2 are bonded to the insulating plate formed as one piece by bonding, for example, with a duct piece automatic pasting machine. Is possible.

  As described in the first embodiment, the refrigerant flow path 180 can be multistaged. Corresponding to this multi-stage, a plurality of types of second insulating plates 122 are provided.

6 iron cores, 15 strands, 31, 32 disc-shaped windings,
100 stationary inductor, 101 insulating plate, 102 duct piece,
102-1 thin duct piece, 102-2 thick duct piece, 103 windings,
111 Spacer for installing duct piece, 121 1st insulating plate, 122 2nd insulating plate,
180 Refrigerant flow path.

Claims (8)

A cooling structure in a static inductor with windings,
The windings are formed by laminating the respective disk-shaped windings with the insulating member facing each disk-shaped winding formed by concentrically winding the strands in the radial direction, A refrigerant flow that is formed with different distances between the disk-shaped windings on the peripheral side and the outer peripheral side, and that flows the refrigerant in the extending direction of the wire between the disk-shaped winding and the insulating member Have a road,
The cooling structure is
A duct piece that is sandwiched between the disk-shaped winding and the insulating member and regulates the height of the refrigerant flow path. The duct piece has a constant thickness and has different thicknesses between types. With multiple types of duct pieces
Corresponding to the size of the distance between the disk-shaped windings on the inner circumferential side and the outer circumferential side between the disk-shaped windings, duct pieces having different thicknesses are discontinuously arranged in the radial direction, The refrigerant flow path height is formed in the radial direction,
This is a cooling structure for a static inductor.   The duct pieces having different thicknesses include a thin duct piece and one or more types of thick duct pieces having a thickness larger than that of the thin duct piece, and the thin duct piece has a distance between the disk-shaped windings. Is arranged corresponding to a relatively small area, the height of the refrigerant flow path is set relatively small, and the thick duct piece corresponds to an area where the distance between the disk-shaped windings is relatively large The cooling structure for a stationary inductor according to claim 1, wherein the cooling channel is arranged to set the height of the refrigerant flow path relatively large.   The insulating member is formed of an insulating plate and a duct piece installation spacer, and the insulating plate is a plate material formed of an electrically insulating material similar to the disk-shaped winding, and the disk-shaped winding The thick duct piece is disposed between the disk-shaped windings in a relatively large distance between the lines, and the duct piece installation spacer is formed of an electrically insulating material, The cooling structure for a stationary inductor according to claim 2, wherein the cooling structure is disposed between the insulating plate and the thin duct piece in a region where a distance between the disk-shaped windings is relatively small.   4. The stationary according to claim 3, wherein in the duct piece installation spacer, at least one of the side along the radial direction and the side of the end in the radial direction is formed in parallel with the corresponding side in the thin duct piece. Cooling structure in the inductor.   The stationary induction according to claim 3 or 4, wherein the thin duct piece is previously attached to the duct piece installation spacer and integrally formed as a duct piece spacer, and the duct piece spacer is attached to the insulating plate. Cooling structure in the vessel.   The insulating member is formed of a first insulating plate and a second insulating plate, and the first insulating plate is similar in shape to the disk-shaped winding and has a first plate thickness and is formed of an electrically insulating material. The second insulating plate has a shape similar to the disk-shaped winding and is larger than the first plate thickness. It is a plate material made of an electrically insulating material having one or a plurality of types of second plate thicknesses having a large thickness, and is disposed corresponding to a region where the distance between the disk-shaped windings is relatively small, The cooling structure for a static inductor according to claim 2, wherein the first insulating plate and the second insulating plate have overlapping regions that overlap each other.   The first insulating plate sandwiches the thick duct piece with the disk-shaped winding, and the second insulating plate sandwiches the thin duct piece with the disk-shaped winding. Item 7. A cooling structure for a stationary inductor according to Item 6. A winding constituted by laminating a plurality of disk-like windings formed by concentrically winding the strands;
In a static inductor provided with an iron core disposed on the outer peripheral side of the winding and forming a magnetic path outside the winding,
A static inductor having a cooling structure according to any one of claims 1 to 7, wherein the static inductor has a cooling structure for cooling the winding.

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