JP2012230957A - Stationary induction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a static induction apparatus by improving a shielding ability of a magnetic shield.SOLUTION: A magnetic shield 140 includes a plurality of electromagnetic steel plates 141 extending in an axial direction of a coil and laminated in a direction orthogonal to the axial direction; a pair of holding plates 142 holding the plural electromagnetic steel plates 141 between them in a lamination direction of the plural electromagnetic steel plates 141; stop plates 143a, 143b extending in the lamination direction and coupling a pair of the holding plates 142; a conductive frame part 146 surrounding an electromagnetic steep plate group 145 away from the electromagnetic steel plate group 145 comprising the plural electromagnetic steel plates 141 held by the stop plates 143a, 143b; and a conductive bridging part 147 extending in the lamination direction of the plural electromagnetic steel plates 141 and electrically connecting one part and the other part of the conductive frame part 146. The conductive bridging part 147 is positioned on one part of the coil away from the plural electromagnetic steel plates 141.

Description

  The present invention relates to a stationary induction device, and more particularly, to a stationary induction device such as a transformer and a reactor.

  Japanese Patent Laid-Open No. 7-2111558 (Patent Publication 1) is a prior art document that discloses a magnetic shield of a stationary induction device. In the magnetic shield of a stationary induction device described in Japanese Patent Application Laid-Open No. 7-21558 (Patent Publication 1), a magnetic shield provided in a strip shape is fixed inside a tank at a position corresponding to a stay by a mounting plate. ing.

Japanese Unexamined Patent Publication No. 7-2111558

  The shielding capability of the magnetic shield increases as the magnetic shield becomes thicker. However, increasing the magnetic shield is an obstacle to downsizing the static induction device.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a stationary induction device capable of improving the shielding ability of a magnetic shield and reducing the size.

  The static induction device according to the present invention is located so as to face the iron core, the winding wound around the iron core, and a part of the peripheral side surface of the winding, and a part of the leakage magnetic flux generated from the winding And a magnetic shield for shielding. The magnetic shield extends in the axial direction of the winding and is laminated in a direction orthogonal to the axial direction, and sandwiches a plurality of electromagnetic steel plates between each other in the laminating direction of the plurality of electromagnetic steel plates 1 A pair of sandwich plates, a stop plate that extends in the stacking direction and connects the pair of sandwich plates together, a pair of sandwich plates, and a group of electromagnetic steel plates that are sandwiched by the stop plates and spaced apart from a group of electrical steel plates A conductive frame portion surrounding the electromagnetic steel sheet group, and a conductive bridge portion extending in the stacking direction of the plurality of electromagnetic steel plates and electrically connecting a part of the conductive frame portion and the other part. . The conductive bridging portion is located away from the plurality of electromagnetic steel plates with respect to a part of the winding.

  According to the present invention, it is possible to improve the shielding ability of the magnetic shield and reduce the size of the stationary induction device.

It is a partial cross section figure which shows the structure of the stationary induction | guidance | derivation apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state which the leakage magnetic flux infiltrated into the magnetic shield of the stationary induction apparatus which concerns on the same embodiment. It is a side view which shows the state which the leakage magnetic flux infiltrated into the magnetic shield of the stationary induction apparatus which concerns on Embodiment 2 of this invention. It is a perspective view which shows the structure of the magnetic shield of the stationary induction apparatus which concerns on Embodiment 3 of this invention. It is a side view which shows the structure of the magnetic shield which has two electromagnetic steel plate groups in the static induction apparatus which concerns on Embodiment 4 of this invention. It is a perspective view which shows the structure of the magnetic shield which has three electromagnetic steel plate groups in the static induction apparatus which concerns on the same embodiment. It is a side view which shows the structure of the magnetic shield of the stationary induction apparatus which concerns on Embodiment 5 of this invention. It is a side view which shows the structure of the magnetic shield of the stationary induction apparatus which concerns on Embodiment 6 of this invention. It is a partial cross section figure which shows the structure of the magnetic shield of the static induction apparatus which concerns on Embodiment 7 of this invention.

  Hereinafter, a stationary induction device according to Embodiment 1 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 partial cross-sectional view showing a configuration of a stationary induction device according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a state in which leakage magnetic flux enters the magnetic shield of the stationary induction device according to the present embodiment. In FIG. 1, only the iron core 110 and the tank 130 are shown in cross section.

  As shown in FIG. 1, the stationary induction device 100 according to the first embodiment of the present invention faces an iron core 110, a winding 120 wound around the iron core 110, and a part of a peripheral side surface of the winding 120. And a magnetic shield 140 that shields a part of the leakage magnetic flux 10 generated from the winding 120.

  The iron core 110, the winding 120 and the magnetic shield 140 are accommodated in the tank 130. The tank 130 is formed of rolled structural steel such as SS400 (Japanese Industrial Standard).

  The iron core 110 is placed on an iron core receiving portion 150 provided on the bottom of the tank 130. The iron core 110 is composed of a plurality of laminated electromagnetic steel plates 111 and has a rectangular outer shape having an opening in the center in a side view.

  In the present embodiment, the magnetic shield 140 is provided along the side wall of the tank 130. In other words, the magnetic shield 140 is disposed between the winding 120 and the side wall of the tank 130.

  As shown in FIGS. 1 and 2, the magnetic shield 140 extends in the axial direction of the winding 120 and is laminated in a direction orthogonal to the axial direction, and the lamination direction of the multiple electromagnetic steel plates 141. A pair of sandwiching plates 142 sandwiching a plurality of electromagnetic steel plates 141 therebetween, stop plates 143a and 143b extending in the stacking direction to connect the pair of sandwiching plates 142, a pair of sandwiching plates 142 and A conductive frame portion 146 that surrounds the periphery of the electromagnetic steel sheet group 145 and is separated from the electromagnetic steel sheet group 145 composed of the plurality of electromagnetic steel sheets 141 sandwiched by the stop plates 143a and 143b, and extends in the stacking direction of the plurality of electromagnetic steel sheets 141. Thus, a conductive bridging portion 147 that electrically connects a part of the conductive frame portion 146 and the other portion is included.

  The electromagnetic steel plate 141 is made of a material having a higher magnetic permeability than the material constituting the tank 130. In the present embodiment, the electromagnetic steel plate 141 has a strip shape, and an insulating layer is formed on both main surfaces. Therefore, each of the laminated electromagnetic steel plates 141 is insulated from each other.

  The sandwiching plate 142 is formed of a strip-shaped metal thin plate. Stop plates 143a and 143b are formed of strip-shaped metal thin plates. The sandwich plate 142 and the stop plates 143a and 143b are joined by welding or the like. The stop plate 143a is located in the intrusion area of the leakage magnetic flux 10 described later. The stop plate 143b is located in the outside area of the leakage magnetic flux 10 described later.

  The conductive frame portion 146 and the conductive bridge portion 147 are formed of a metal having a lower electrical resistance than the material constituting the tank 130. In the present embodiment, the conductive frame portion 146 and the conductive bridging portion 147 are formed of copper, but the material of the conductive frame portion 146 and the conductive bridging portion 147 is not limited to this, for example, aluminum and superconducting Wires may be used.

  The conductive frame portion 146 and the conductive bridge portion 147 are not necessarily formed of the same material. For example, the conductive frame portion 146 is formed of copper and the conductive bridge portion 147 is formed of aluminum. May be.

  In the present embodiment, the conductive bridging portion 147 connects the central portions of the two first extending portions extending in the extending direction of the plurality of electromagnetic steel plates 141 in the conductive frame portion 146. . In addition, the conductive bridging portion 147 is located away from the plurality of electromagnetic steel plates 141 with respect to a part of the circumferential side surface of the winding 120 facing the magnetic shield 140.

  A gap having a predetermined interval is provided between the inner peripheral surface of the conductive frame portion 146 and the side surface of the electromagnetic steel sheet group 145. In the present embodiment, the thickness of the conductive bridging portion 147 and the thickness of the stopper plates 143a and 143b are substantially the same.

Hereinafter, the effect | action which the magnetic shield 140 shields the leakage magnetic flux 10 is demonstrated.
As shown in FIGS. 1 and 2, when a current is passed through the winding 120, the leakage magnetic flux 10 linked to the winding 120 is generated. Leakage magnetic flux 10 that has advanced in the vicinity of the side wall of tank 130 passes through electromagnetic steel sheet 141 having a higher permeability than tank 130 and returns to winding 120.

  The leakage magnetic flux 10 enters the electromagnetic steel plate 141 from the side surface of the electromagnetic steel plate 141. Therefore, eddy current loss can be reduced as compared with the case where the leakage magnetic flux 10 enters the main surface of the electromagnetic steel plate 141 wider than the side surface. Moreover, since the insulating layers are formed on both main surfaces of the electromagnetic steel sheet 141, it is possible to prevent eddy current from flowing across the plurality of electromagnetic steel sheets 141.

  In the magnetic shield 140, since the conductive frame portion 146 and the conductive bridging portion 147 constitute a closed circuit, when the leakage magnetic flux 10 enters the magnetic shield 140 and goes out, the leakage magnetic flux 10 is canceled out. The shielding currents 20 and 21 to be generated are generated. Only the shielding current flowing through the main path is shown.

  In the present embodiment, the conductive bridging portion 147 is located at the boundary between the area where the leakage magnetic flux 10 enters the magnetic shield 140 and the area where the magnetic shield 140 goes out. Therefore, a shielding current 20 is generated in the counterclockwise direction so as to prevent the leakage flux 10 from entering the conductive frame portion 146 and the conductive bridge portion 147 located around the penetration area where the leakage flux 10 enters the magnetic shield 140. To do.

  On the other hand, in the conductive frame portion 146 and the conductive bridging portion 147 located around the outing region where the leakage magnetic flux 10 goes out of the magnetic shield 140, a shielding current 21 is generated clockwise so as to prevent the leakage magnetic flux 10 from going out. To do.

  By disposing the conductive bridging portion 147 at the above-described boundary position, both the intrusion and the outflow of the leakage magnetic flux 10 can be efficiently prevented, so that the shielding ability of the magnetic shield 140 can be improved. However, the position of the conductive bridging portion 147 is not limited to the above, and may be deviated from the boundary position.

  By canceling a part of the leakage magnetic flux 10 with the shielding currents 20 and 21, the amount of the leakage magnetic flux 10 necessary for the electromagnetic steel plate 141 to be saturated with the magnetic flux can be increased. In other words, the shielding ability of the magnetic shield 140 can be improved.

  Therefore, compared with the conventional magnetic shield which has the same shielding capability, in the magnetic shield 140, the width | variety of the some electromagnetic steel plate 141 can be made small. As a result, by adopting the thin magnetic shield 140, the tank 130 can be made small and the stationary induction device 100 can be downsized.

  Further, since the gaps between the plurality of electromagnetic steel plates 141 and the side walls of the tank 130 are ensured by the thickness of the stop plates 143a and 143b, the magnetic resistance between the plurality of electromagnetic steel plates 141 and the side walls of the tank 130 is secured. Can be kept high. As a result, it is possible to suppress the leakage magnetic flux 10 flowing in the electromagnetic steel sheet 141 from flowing into the side wall of the tank 130 and maintain the shielding ability of the magnetic shield 140 high.

  In particular, when the tank 130 is made of a ferromagnetic material such as a general structural rolled steel, if there is no gap between the electromagnetic steel plate 141 and the side wall of the tank 130, the magnetic steel plate increases as the magnetic flux density in the electromagnetic steel plate 141 increases. The relative permeability of 141 decreases and the magnetic flux easily passes through the tank 130 relatively. In this case, there is a high possibility that the leakage magnetic flux 10 enters the tank 130 before the electromagnetic steel plate 141 is saturated with the magnetic flux, and an eddy current is generated in the tank 130. Therefore, the effect by maintaining the clearance between the electromagnetic steel plate 141 and the side wall of the tank 130 and maintaining the shielding ability of the magnetic shield 140 high is great.

  A gap having a predetermined interval is provided between the inner peripheral surface of the conductive frame portion 146 and the side surface of the electrical steel sheet group 145, but the leakage magnetic flux 10 that enters the side wall of the tank 130 from the gap is shielded. Shielded by currents 20 and 21. By doing in this way, compared with the case where the electromagnetic steel plate group 145 is arrange | positioned without the clearance gap in the area | region enclosed by the electroconductive frame part 146, the electromagnetic steel plate 141 can be shortened and the manufacturing cost of the stationary induction apparatus 100 can be reduced.

  In this embodiment, since the thickness of the conductive bridging portion 147 and the thickness of the stopper plates 143a and 143b are the same, the electromagnetic steel plate group 145 is placed in the tank 130 without making the stopper plates 143a and 143b as thick as possible. It can be installed on the side wall.

  Note that the sandwich plate 142 and the conductive bridging portion 147 may be joined by welding or the like. In this case, the conductive bridging portion 147 can have a function as the stop plates 143a and 143b. Specifically, similarly to the stop plates 143a and 143b, the conductive bridging portion 147 has a function of suppressing the occurrence of deflection in the electromagnetic steel sheet group 145 when electromagnetic force or the like acts on the electromagnetic steel sheet group 145. .

  As described above, the magnetic flux 140 prevents the leakage magnetic flux 10 from entering the side wall of the tank 130, thereby reducing iron loss and reducing the leakage magnetic flux compared with the case where the leakage magnetic flux 10 enters the tank 130. The heat loss due to 10 can be greatly reduced.

  Further, since the conductive frame portion 146 and the conductive bridging portion 147 are formed of a material having low electric resistance, Joule heat loss due to the shielding currents 20 and 21 can be reduced.

  In this embodiment, the magnetic shield 140 is arranged on the side wall of the tank 130. However, the arrangement of the magnetic shield 140 is not limited to this, and is arranged on the winding 120 side of the metal structure to which the leakage magnetic flux 10 extends. Just do it.

  Hereinafter, the stationary induction device according to the second embodiment of the present invention will be described. Since this embodiment is different from the stationary induction device described in the first embodiment only in the number of conductive bridging portions and stop plates, the description of other configurations will not be repeated.

(Embodiment 2)
FIG. 3 is a side view showing a state in which leakage magnetic flux has entered the magnetic shield of the stationary induction device according to the second embodiment of the present invention. As shown in FIG. 3, the magnetic shield 140a of the stationary induction device according to the second embodiment of the present invention has two conductive bridging portions 147a and 147b that are spaced apart from each other. As shown in FIG. 3, two leakage magnetic fluxes 11 and 12 having different paths enter the magnetic shield 140a.

  The conductive bridging portion 147a is located at the boundary between the area where the leakage magnetic flux 11 enters the magnetic shield 140a and the area where the magnetic shield 140a goes out. In addition, the conductive bridging portion 147b is located at the boundary between the area where the leakage magnetic flux 12 enters the magnetic shield 140a and the area where the magnetic shield 140a goes out.

  Since the magnetic shield 140a forms a closed circuit by the conductive frame portion 146 and the conductive bridging portions 147a and 147b, the leakage magnetic flux 11 and 12 enters the magnetic shield 140a and goes out, so that the leakage magnetic flux 11 , 12 are generated to shield currents 22, 23, 24. Only the shielding current flowing through the main path is shown.

  In the present embodiment, the conductive frame portion 146 and the conductive bridging portion 147a positioned around the intrusion region where the leakage magnetic flux 11 enters the magnetic shield 140a is shielded counterclockwise so as to prevent the leakage magnetic flux 11 from entering. A current 22 is generated. Further, a shielding current 24 is generated counterclockwise so as to prevent the leakage flux 12 from entering the conductive frame portion 146 and the conductive bridge portion 147b located around the penetration area where the leakage flux 12 enters the magnetic shield 140a. To do.

  On the other hand, in the conductive frame portion 146 and the conductive bridging portions 147a and 147b located around the outing region where the leakage magnetic fluxes 11 and 12 go out from the magnetic shield 140a, the leakage magnetic fluxes 11 and 12 are turned clockwise so as to prevent the leakage magnetic fluxes 11 and 12 from going out. A shielding current 23 is generated.

  By disposing the conductive bridging portions 147a and 147b at the above-mentioned boundary positions, it is possible to effectively prevent both the leakage magnetic fluxes 11 and 12 from entering and going out, so that the shielding ability of the magnetic shield 140a can be improved. it can. However, the positions of the conductive bridging portions 147a and 147b are not limited to the above, and may deviate from the boundary positions.

  Thus, by providing a plurality of conductive bridging portions, leakage magnetic flux of a plurality of paths can be shielded by one magnetic shield. Note that the number of conductive bridging portions to be arranged is appropriately determined according to the number of paths of leakage magnetic flux.

  Hereinafter, a stationary induction device according to Embodiment 3 of the present invention will be described. Since this embodiment is different from the stationary induction device described in the first embodiment only in that the conductive frame portion has an insulating portion, the description of other configurations will not be repeated.

(Embodiment 3)
FIG. 4 is a perspective view showing the structure of the magnetic shield of the stationary induction device according to the third embodiment of the present invention. As shown in FIG. 4, the magnetic shield 140 b of the stationary induction device according to the third embodiment of the present invention is formed on the first extending portion that extends in the extending direction of the plurality of electromagnetic steel plates 141 among the conductive frame portion 146 a. The insulating portion 144 extends in the extending direction.

  In the present embodiment, the insulating portion 144 is configured by a slit. By providing the insulating portion 144 in the conductive frame portion 146a, the path of eddy current generated in the conductive frame portion 146a by the leakage magnetic flux 10 can be reduced, and eddy current loss can be reduced.

  The insulating portion 144 may be provided in other portions of the conductive frame portion 146a, but is preferably provided so as not to hinder the flow of the shielding current. Further, the conductive bridging portion 147 may be provided with an insulating portion extending in the extending direction of the plurality of electromagnetic steel plates 141.

  The form of the insulating portion 144 is not limited to the slit. For example, the first extending portion of the conductive frame portion 146a is formed by laminating a plurality of metal thin plates having insulating layers on both main surfaces. The layer may be the insulating portion 144.

  Further, for example, the first extending portion of the conductive frame portion 146a may be constituted by an electric wire bundled with thin wires having an insulating layer formed on the surface thereof, and this insulating layer may be used as the insulating portion 144. When the electric wire is a twisted wire drawn at regular intervals, the current density distribution of the shielding current flowing through the conductive frame portion 146a and the conductive bridge portion 147 is averaged, and the conductive frame portion 146a and the conductive bridge portion 147 are averaged. It is more preferable because the Joule heat loss generated in can be reduced.

  Hereinafter, a stationary induction device according to Embodiment 4 of the present invention will be described. Since this embodiment is different from the stationary induction device described in the first embodiment only in that a plurality of electromagnetic steel sheet groups are arranged adjacent to each other, the description of other configurations will not be repeated.

(Embodiment 4)
FIG. 5 is a side view showing a structure of a magnetic shield having two electromagnetic steel sheet groups in a stationary induction device according to Embodiment 4 of the present invention. FIG. 6 is a perspective view showing the structure of a magnetic shield having three electromagnetic steel sheet groups in the static induction device according to the present embodiment.

  As shown in FIG. 5, in the magnetic shield 140c of the stationary induction device according to the fourth embodiment of the present invention, two electrical steel sheet groups 145 are arranged on the side wall of the tank 130 at a predetermined interval.

  Also in this embodiment, the eddy current loss generated on the side wall of the tank 130 can be reduced. In addition, since the magnetic shield 140 can be thinned by the conductive frame portion 146 and the conductive bridging portion 147, the tank 130 can be made small and the stationary induction device 100 can be miniaturized.

  As shown in FIG. 6, in the magnetic shield 140 d of the stationary induction device according to the fourth embodiment of the present invention, three electrical steel sheet groups 145 c are arranged on the side wall of the tank 130 at a predetermined interval.

  The electromagnetic steel plate group 145c has four stop plates 143a, 143b, 143c, and 143d arranged at a predetermined interval. The stop plates 143a and 143b are disposed in the intrusion region of the leakage magnetic flux 10. The stop plates 143c and 143d are disposed in a region where the leakage magnetic flux 10 is out.

  Also in the magnetic shield 140d, eddy current loss generated on the side wall of the tank 130 can be reduced. Moreover, when attaching the several electromagnetic steel plate group 145c to the side wall of the tank 130 by welding, the work space for welding can be ensured between the electromagnetic steel plate groups 145c, Therefore Welding workability | operativity can be improved. In addition, the number of the electromagnetic steel plate groups with which the magnetic shield is provided is not limited to the above, and may be four or more.

  Hereinafter, a stationary induction device according to Embodiment 5 of the present invention will be described. Since the present embodiment is different from the stationary induction device described in the first embodiment only in that a recess is formed in the second extending portion of the conductive frame portion, description of other configurations will not be repeated.

(Embodiment 5)
FIG. 7 is a side view showing the structure of the magnetic shield of the stationary induction device according to the fifth embodiment of the present invention. As shown in FIG. 7, in the magnetic shield 140e of the stationary induction device according to the fifth embodiment of the present invention, the second extending portion 148a extending in the stacking direction of the plurality of electromagnetic steel plates 141 among the conductive frame portion 146b. However, it has the recessed part 149 surrounding the edge part of the electromagnetic steel plate group 145 in the extending direction of the some electromagnetic steel plate 141. As shown in FIG.

  In this case, the length of the magnetic shield 140e can be reduced. As a result, the tank 130 can be made small, and the stationary induction device can be downsized.

  Hereinafter, a stationary induction device according to Embodiment 6 of the present invention will be described. Since this embodiment is different from the stationary induction device described in the first embodiment only in that the part of the second extending portion of the conductive frame portion and the end of the electrical steel sheet group overlap each other, for other configurations Do not repeat the explanation.

(Embodiment 6)
FIG. 8 is a side view showing the structure of the magnetic shield of the stationary induction device according to the sixth embodiment of the present invention. As shown in FIG. 8, in the magnetic shield 140f of the stationary induction device according to the sixth embodiment of the present invention, the second extending portion 148b extending in the stacking direction of the plurality of electromagnetic steel plates 141 among the conductive frame portion 146. However, it overlaps with the end of the electromagnetic steel sheet group 145d in the extending direction of the plurality of electromagnetic steel sheets 141.

  The stop plates 143e and 143f are formed with the same thickness as the second extending portion 148b. The stop plate 143e is disposed in the intrusion region of the leakage magnetic flux 10. The stop plate 143f is disposed in the area where the leakage magnetic flux 10 goes out.

  In this case, the length of the magnetic shield 140f can be reduced. As a result, the tank 130 can be made small, and the stationary induction device can be downsized.

  Hereinafter, a stationary induction device according to Embodiment 7 of the present invention will be described. Since this embodiment is different from the stationary induction device described in the first embodiment only in that the magnetic shield is disposed and the iron core is supported by the tongue support, the description of other configurations will not be repeated.

(Embodiment 7)
FIG. 9 is a partial cross-sectional view showing the structure of the magnetic shield of the stationary induction device according to the seventh embodiment of the present invention. As shown in FIG. 9, the magnetic shield 200 of the stationary induction device according to the seventh embodiment of the present invention is disposed on the bottom surface of the tongue support 170 that is disposed between the winding 120 and the iron core 110 and supports the iron core 110. It is arranged along. In other words, the magnetic shield 200 is disposed between the winding 120 and the tongue support 170.

  The tongue support 170 has an inverted T-shaped cross section and is made of a metal member. A plurality of electromagnetic steel plates 111 constituting the iron core 110 are laminated on the upper surface of the horizontal support portion arranged in the horizontal direction in the tongue support 170.

  As shown in FIG. 9, the magnetic shield 200 extends in the axial direction of the winding 120 and is laminated in a direction orthogonal to the axial direction, and in the laminating direction of the electromagnetic steel plates 181. These two electromagnetic steel plates are separated from two electromagnetic steel plate groups 180 composed of a plurality of electromagnetic steel plates 181 sandwiched by two pairs of sandwich plates 182 and one pair of sandwich plates 182 sandwiching the plurality of electromagnetic steel plates 181 therebetween. A conductive frame portion 191 that surrounds the periphery of the group 180 and a conductive bridging portion 191 that extends in the stacking direction of the plurality of electromagnetic steel plates 181 and electrically connects a part of the conductive frame portion 190 and the other part. including.

  In the present embodiment, the conductive bridging portion 191 also serves as a stop plate. Specifically, the conductive bridging portion 191 is connected to the four sandwiching plates 182 by welding or the like.

  The electromagnetic steel plate 181 is made of a material having a higher magnetic permeability than the material constituting the tongue support 170. In the present embodiment, the electromagnetic steel plate 181 has a strip shape, and an insulating layer is formed on both main surfaces. Therefore, each of the laminated electromagnetic steel plates 181 is insulated from each other.

  The conductive frame portion 190 and the conductive bridge portion 191 are made of a metal having a lower electric resistance than the material constituting the tongue support 170. In the present embodiment, the conductive frame 190 and the conductive bridging portion 191 are made of copper, but the material of the conductive frame 190 and the conductive bridging portion 191 is not limited to this, for example, aluminum and superconducting Wires may be used.

  The conductive frame 190 and the conductive bridge 191 are not necessarily formed of the same material. For example, the conductive frame 190 is formed of copper, and the conductive bridge 191 is formed of aluminum. May be.

  In the present embodiment, the conductive bridging portion 191 connects the central portions of the two first extending portions extending in the extending direction of the plurality of electromagnetic steel plates 181 in the conductive frame portion 190. . In addition, the conductive bridging portion 191 is located away from the plurality of electromagnetic steel plates 181 with respect to a part of the peripheral side surface of the winding 120 facing the magnetic shield 200.

  In the magnetic shield 200, since the conductive frame portion 190 and the conductive bridging portion 191 constitute a closed circuit, the leakage magnetic flux generated from the winding 120 enters the magnetic shield 200 and goes out. A shielding current is generated that tries to cancel the leakage magnetic flux.

  By canceling out part of the leakage magnetic flux with the shielding current, the amount of leakage magnetic flux required for the electromagnetic steel plate 181 to be saturated with the magnetic flux can be increased. In other words, the shielding ability of the magnetic shield 200 can be improved. Therefore, compared with the conventional magnetic shield which has the same shielding capability, in the magnetic shield 200, the width | variety of the some electromagnetic steel plate 181 can be made small.

  The distance between the winding 120 and the magnetic shield 200 is determined so as to ensure an insulation distance between the winding 120 and the magnetic shield 200. Therefore, it is possible to reduce the winding diameter of the winding 120 by reducing the width of the plurality of electromagnetic steel plates 181 and making the magnetic shield 200 thinner. As a result, since the overall length of the winding 120 can be shortened, the manufacturing cost of the winding 120 can be reduced, and the Joule heat loss in the winding 120 can be reduced. Further, since the winding diameter is reduced, the tank 130 can be reduced and the stationary induction device can be reduced in size.

  The upper part of the iron core 110 may be manufactured with the same configuration. In this case, the same effect can be obtained by arranging the magnetic shield 200 between the winding 120 and the tongue support 170.

  In a static induction device that does not have the tongue support 170, the same effect can be obtained by arranging the magnetic shield 200 between the iron core 110 and the winding 120. In the present embodiment, the magnetic shield 200 includes the two electromagnetic steel plate groups 180, but it is only necessary to include one or more electromagnetic steel plate groups 180.

  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. Further, all modifications within the meaning and scope equivalent to the scope of the claims are included.

  10, 11, 12 Leakage magnetic flux, 20, 21, 22, 23, 24 Shielding current, 100 Stationary induction device, 110 Iron core, 111, 141, 181 Electrical steel sheet, 120 windings, 130 tank, 140, 140a, 140b, 140c , 140d, 140e, 140f, 200 Magnetic shield, 142, 182 Clipping plate, 143a, 143b, 143c, 143d, 143e, 143f Stop plate, 144 Insulating part, 145, 145a, 145b, 145c, 145d, 180 Electrical steel sheet group, 146, 146a, 146b, 190 Conductive frame part, 147, 147a, 147b, 191 Conductive bridge part, 148a, 148b Second extension part, 149 Recessed part, 150 Iron core receiving part, 170 Tongue support.

Claims (6)

Iron core,
A winding wound around the iron core;
A magnetic shield that is positioned so as to face a part of the peripheral side surface of the winding and shields a part of the leakage magnetic flux generated from the winding;
The magnetic shield extends in the axial direction of the winding and is laminated in a direction orthogonal to the axial direction, and the magnetic steel sheets are disposed between each other in the lamination direction of the electromagnetic steel sheets. A pair of sandwich plates sandwiched between, a stop plate extending in the stacking direction to connect the pair of sandwich plates together, the pair of sandwich plates and the plurality of electromagnetic steel plates sandwiched by the stop plates A conductive frame portion that is spaced apart from the electromagnetic steel plate group and surrounds the periphery of the electromagnetic steel plate group, and extends in the stacking direction of the plurality of electromagnetic steel plates to electrically connect a part of the conductive frame portion and the other part. Including a conductive bridge leading to
The stationary induction device, wherein the conductive bridging portion is located away from the plurality of electromagnetic steel plates with respect to the part of the winding.   The stationary induction device according to claim 1, wherein the conductive bridging portion is located at a boundary between a region where the leakage magnetic flux enters the magnetic shield and a region where the magnetic flux goes out from the magnetic shield.   The stationary induction device according to claim 1, wherein the magnetic shield has a plurality of the conductive bridging portions that are spaced apart from each other.   The stationary according to any one of claims 1 to 3, wherein an insulating portion extending in the extending direction is provided in a first extending portion extending in the extending direction of the plurality of electromagnetic steel plates among the conductive frame portions. Induction equipment.   The stationary induction device according to any one of claims 1 to 4, wherein the magnetic shield includes a plurality of the electromagnetic steel sheet groups that are spaced apart from each other.   The 2nd extension part extended in the lamination direction of these electromagnetic steel plates among the conductive frame parts has a crevice which surrounds the end of the electromagnetic steel plate group in the extension direction of these electromagnetic steel plates. Item 6. The stationary induction device according to any one of Items 1 to 5.

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