JP2020043193A - Mold type static induction device - Google Patents

Abstract

To provide a mold type static induction device capable of improving dielectric strength.SOLUTION: A mold type static induction device 10 includes a coil 21 having a high-voltage side winding 211 and a low-voltage side winding 212 and having a surface of the winding covered with an insulating member, an iron core passed through the center of the coil 21, a clamp 51 that is attached by sandwiching the end of the iron core protruding from the coil, a coil holding mechanism 60 having a holding portion in contact with the axial end surface of the coil, and holding the coil by pressing the holding portion toward the center in the axial direction with the clamp as a fulcrum, and an insulating member 81 which is formed of a member having electrical insulation properties and is provided at an intermediate portion in the axial direction of the pressing portion and covers the pressing portion in plan view.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a molded stationary induction device.

  2. Description of the Related Art Conventionally, there has been known a molded stationary induction device in which insulation performance is secured by molding the surface of a winding with an insulating member such as a resin. Such a molded stationary induction device stores a molded winding in a container and fills the container with dry air or the like to ensure insulation between the winding and the container and apply the high voltage. ing. However, since the voltage on the primary side, that is, the high voltage side is high in such a molded stationary induction device, a higher dielectric strength is required to prevent dielectric breakdown from the high voltage side winding to the iron core or the like.

JP-A-2005-225894

  Therefore, a mold-type stationary induction device that can improve the dielectric strength is provided.

  The molded static induction device of the embodiment has a coil having a high-voltage side winding and a low-voltage side winding, and a surface of the winding is covered with an insulating member, an iron core passed through the center of the coil, A clamp attached to the end of the core protruding from the coil, and a pressing portion in contact with an axial end surface of the coil; A coil holding mechanism for holding the coil by pressing the holding member, and an insulating member that is provided with an electrically insulating member and that is provided at an intermediate portion of the holding portion in the axial direction and covers the holding portion in plan view. .

1 is a cross-sectional view illustrating a schematic configuration of a molded stationary induction device according to an embodiment. 1 is a cross-sectional view of a molded stationary induction device according to an embodiment, taken along line X2-X2 in FIG. 1 is a cross-sectional view of a molded stationary induction device according to one embodiment, taken along line X3-X3 in FIG. FIG. 1 is a cross-sectional view of a molded stationary induction device according to one embodiment, taken along line X4-X4 in FIG. 1. FIG. 1 is a cross-sectional view of a molded stationary induction device according to one embodiment, taken along line X5-X5 in FIG. 1. Sectional drawing which expands and shows the structure around the upper end part of a coil about the molded static induction device by one Embodiment. Sectional drawing which expands and shows the structure around the lower end part of a coil about the molded static induction device by one Embodiment.

Hereinafter, an embodiment will be described with reference to the drawings.
The molded transformer 10 shown in FIG. 1 is an example of an application example of a molded stationary induction device, and is used for, for example, an electric power system and a power receiving and transforming facility. In the case of the present embodiment, the molded transformer 10 is a three-phase transformer having U-phase, V-phase, and W-phase windings. In addition, the mold transformer 10 is not limited to a three-phase transformer.

  The mold transformer 10 includes equipment contents 20, a container 30, and a heat exchanger 40. The equipment contents 20 are provided corresponding to each phase of the mold transformer 10. For example, in the present embodiment, since the mold transformer 10 is a three-phase transformer having a U-phase, a V-phase, and a W-phase, three device contents 20 corresponding to the U-phase, the V-phase, and the W-phase, respectively. It has.

  As shown in FIGS. 2 and 3, the device content 20 includes a coil 21, an iron core 22, and a spacer 23. The coil 21 has a high-voltage side winding 211, a low-voltage side winding 212, a high-voltage side lead wire 213, a low-voltage side lead wire 214, and an iron core insertion part 215. The high-voltage side winding 211 functions as a primary-side winding to which high-voltage power is input when the molded transformer 10 is applied to, for example, a power system. Further, the low-voltage side winding 212 functions as a secondary-side winding that outputs low-voltage power when the molded transformer 10 is applied to, for example, a power system. The high-voltage side lead wire 213 is connected to the high-voltage side winding 211 and is drawn out from the upper end of the high-voltage side winding 211. Similarly, the low-voltage lead wire 214 is connected to the low-voltage winding 212 and is drawn out from the upper end of the low-voltage winding 212.

  The entire surface of the high-voltage side winding 211 and the low-voltage side winding 212 is covered with an insulating member such as a resin. That is, the surfaces of the high-voltage side winding 211 and the low-voltage side winding 212 are molded with an insulating member such as a resin having electrical insulation. In this case, the high-voltage side winding 211 is provided on the outer peripheral side of the low-voltage side winding 212. The core insertion part 215 is a cylindrical hole formed at the center of the coil 21. That is, the core insertion portion 215 is formed inside the low-voltage side winding 212. The iron core 22 is formed in a rectangular rod shape by stacking silicon steel plates, for example, and is passed through the iron core insertion part 215 at the center of the coil 21. In this case, although not shown in detail, each upper end and each lower end of each iron core 22 corresponding to the equipment contents 20 of each of the three phases are interconnected.

  The spacer 23 is provided between the high-voltage side winding 211 and the low-voltage side winding 212 as shown in FIGS. 2 and 3. That is, the spacer 23 is provided on the inner peripheral side of the high-voltage side winding 211 and on the outer peripheral side of the low-voltage side winding 212. The spacer 23 is formed in a wave shape over the entire circumference of the high-voltage side winding 211 and the low-voltage side winding 212. The space 23 is formed between the high-voltage side winding 211 and the low-voltage side winding 212 by the spacer 23 to secure a space for flowing the cooling gas, and to form the high-voltage side winding 211 and the low-voltage side winding 212. The required insulation strength between them is secured. The spacer 23 is not limited to a corrugated shape as long as the spacer 23 has a shape capable of securing an insulation strength between the high-voltage side winding 211 and the low-voltage side winding 212 and a space for cooling.

  As shown in FIG. 1, the container 30 constitutes an outer shell of the molded transformer 10, and mainly includes a metal housing such as a steel plate. The container 30 is formed in an airtight box shape. The device contents 20 are housed inside a container 30. Although not shown in detail, in the case of the present embodiment, the three device contents 20 corresponding to each of the three phases are linearly arranged in a row at equal intervals in the container 30. For this reason, the container 30 is formed in a shape that is long in one direction as a whole, for example, a box shape that is rectangular in plan view.

  In this case, the adjacent device contents 20 and the device content 20 and the inner wall surface of the container 30 are separated from each other. Thereby, gaps are secured between the adjacent device contents 20 and between the device contents 20 and the inner wall surface of the container 30, respectively. The gap secures a space through which the cooling gas flows, and also secures a necessary insulation strength between the contents 20 of the devices and between the contents 20 of the device and the inner wall of the container 30.

  The container 30 is grounded via a ground wire 11 and a ground pole 12, for example, by class A grounding, and is at ground potential. In this case, the ground wire 11 is formed of a metal wire having a resistance value of 10Ω or less and a tensile strength of 1.04 kN or more, or a soft copper wire having a diameter of 2.6 mm or more. The ground electrode 12 is made of a copper plate, a copper bar, a galvanized iron bar, or the like, and is buried in the ground. In this case, although not shown in detail, the iron core 22 is also grounded via the ground wire 11 and the ground electrode 12 and is at the ground potential.

  The inside of the container 30 is a sealed space in which airtightness is maintained. In this case, the container 30 is filled with a gas such as dry air having a pressure higher than the atmospheric pressure. The dielectric strength of air is approximately proportional to its absolute pressure. Therefore, by filling the container 30 with dry air having a pressure higher than the atmospheric pressure, the mold transformer 10 can obtain a higher dielectric strength than in the case where the equipment contents 20 are installed at the atmospheric pressure. . The container 30 is not limited to high-pressure dry air, but may be filled with an inert gas such as SF6.

  The container 30 has an upper connection duct 31 and a lower connection duct 32. The upper connection duct 31 and the lower connection duct 32 connect the inside of the container 30 and the heat exchanger 40. That is, the inside of the container 30 and the heat exchanger 40 communicate with each other through the connection ducts 31 and 32. In this case, the upper connection duct 31 is provided above the container 30, specifically, above the upper end of the coil 21. The lower connection duct 32 is provided below the upper connection duct 31 and below the container 30, specifically, below the lower end of the coil 21.

  The heat exchanger 40 communicates with the inside of the container 30 via the upper connection duct 31 and the lower connection duct 32. The heat exchanger 40 has a function of radiating the heat generated by the operation of the device contents 20 to the atmosphere. When the gas in the container 30 is heated by the heat generated in the device contents 20, as shown by the outline arrows in FIG. 1, the gap around the device contents 20 and the voids 24 formed inside the device contents 20 are formed. And rises inside the container 30.

  The gas that has risen in the container 30 flows into the heat exchanger 40 through the upper connection duct 31, and the heat of the gas is radiated to the atmosphere by the action of the heat exchanger 40. Thereafter, the gas whose heat has been radiated and whose temperature has been lowered flows into the container 30 from the lower connection duct 32, and rises again through the gap around the apparatus content 20 and the gap 24. In this way, a gas flow naturally circulating in the container 30 is generated, and the contents 20 of each device are naturally cooled by the gas flow. Note that a configuration may be adopted in which a blower is provided in the connection ducts 31 and 32 and the gas in the container 30 is forcibly circulated. According to this, the cooling efficiency in the mold transformer 10 can be further improved.

  The mold transformer 10 includes an upper clamp 51, a lower clamp 52, and a coil pressing mechanism 60, as shown in FIG. As shown in FIG. 6, the upper clamp 51 is formed by bending a steel plate or the like, for example. The upper clamp 51 sandwiches the upper end of the iron core 22 projecting upward from the coil 21 from both sides. Attached to. In this case, the upper clamp 51 is fixed so that it cannot move relative to the iron core 22. Further, although not shown in detail, the upper clamp 51 is provided over the three device contents 20 corresponding to each of the three phases, and connects the upper ends of the iron cores 22. That is, the upper clamp 51 connects and fixes the upper ends of the three iron cores 22 corresponding to each of the three phases.

  As shown in FIG. 7, the lower clamp 52 is formed by bending a steel plate or the like in the same manner as the upper clamp 51, and a lower end portion of the iron core 22 protruding downward from the coil 21 is sandwiched from both sides. It is attached to the lower end of the iron core 22. In this case, the lower clamp 52 is fixed so that it cannot move relative to the iron core 22. The lower clamp 52 is fixed to the bottom of the container 30 using a fastening member (not shown) or the like. Thus, the contents 20 of the device are fixed to the bottom of the container 30 via the lower clamp 52.

  Although not shown in detail, the lower clamp 52 is also provided over the three device contents 20 corresponding to each of the three phases, similarly to the upper clamp 51, and connects the lower ends of the iron cores 22. I have. That is, the lower clamp 52 connects and fixes the lower ends of the three iron cores 22 corresponding to the three phases. Although not shown in detail, the clamps 51 and 52 are grounded via the ground wire 11 and the ground pole 12.

  As shown in FIG. 1, the coil holding mechanism 60 is connected to the upper clamp 51 or the lower clamp 52, and the upper end surface or the lower end surface of the coil 21 in the axial direction is the center side in the axial direction of the coil 21, in this case. , For pressing down on the upper and lower center sides of the plane of FIG. As shown in FIGS. 1, 2, and 4, four coil holding mechanisms 60 are provided corresponding to the upper and lower end surfaces of the coil 21, respectively. In this case, as shown in FIGS. 2 and 4, two coil holding mechanisms 60 are arranged on the outer side opposite to the iron core 22 with respect to the clamps 51 and 52. Each of the clamps 51 and 52 is arranged on the same circumference.

  The coil pressing mechanism 60 connected to the upper clamp 51 and the coil pressing mechanism 60 connected to the lower clamp 52 have the same shape and configuration. As shown in FIGS. 6 and 7, the coil pressing mechanism 60 includes a connecting portion 61, a pressing portion 62, a bolt portion 63, and a nut 64. The connecting portion 61 is formed of, for example, a metal plate or block member, and is connected and fixed to the clamps 51 and 52 by welding or the like. The holding portion 62 is made of a synthetic resin such as a polyester resin having electrical insulation, and is configured as a rectangular parallelepiped block as a whole. One surface of the pressing portion 62 is in contact with the axial end surface of the coil 21, that is, the upper end surface or the lower end surface of the coil 21.

  The bolt portion 63 is, for example, a so-called cut-off bolt formed of a rod-shaped member made of metal or resin and formed with a screw over the entire length of the rod. One end of the bolt portion 63 is fixed to the holding portion 62, and the other end is passed through a hole formed in the connection portion 61. In this case, the bolt portion 63 and the holding portion 62 are configured to be able to move relative to the connection portion 61 along the axial direction of the coil 21. The nut 64 is provided so as to be passed through the bolt portion 63 and to be in contact with one surface of the connection portion 61.

  By rotating the nut 64 in a state where the nut 64 is in contact with the connecting portion 61, the bolt portion 63 and the pressing portion 62 move along the axial direction of the coil 21. Thereby, the pressing portion 62 presses the upper and lower end surfaces of the coil 21. For example, a case where the bolt portion 63 and the nut 64 are right-handed screws will be described. In this case, in the coil holding mechanism 60 provided above the coil 21 shown in FIG. 6, when the nut 64 rotates clockwise, a force to move the bolt portion 63 downward acts on the bolt portion 63. 21 is pressed down.

  On the other hand, in the coil holding mechanism 60 provided below the coil 21 shown in FIG. 7, when the nut 64 rotates counterclockwise, a force for moving the bolt portion 63 upward acts on the bolt portion 63. Press down on the lower end face. Thereby, the upper and lower end faces of the coil 21 are pressed and fixed by the pressing portion 62 of the coil pressing mechanism 60. When the fixing of the coil 21 is released, the nut 64 of each coil holding mechanism 60 may be rotated in a direction opposite to the above-described direction.

  The mold transformer 10 includes an upper electrostatic shield 71, a lower electrostatic shield 72, an upper insulating member 81, and a lower insulating member 82, as shown in FIG. The upper electrostatic shield 71 and the lower electrostatic shield 72 are made of a conductive or semiconductive member, and are formed in a flat fan shape or a ring shape as a whole. The upper electrostatic shield 71 and the lower electrostatic shield 72 have a function of alleviating electric field concentration on the corners of the clamps 51 and 52, particularly on the upper and lower ends of the iron core 22, and the like. In this case, the upper electrostatic shield 71 and the lower electrostatic shield 72 are formed by using an insulating material such as an epoxy resin as a base material and coating the periphery of the base material with a conductive or semiconductive paint. ing.

  As shown in FIG. 6, the upper electrostatic shield 71 is provided in contact with a surface of the pressing portion 62 of the coil pressing mechanism 60 connected to the upper clamp 51, which is on the opposite side to the surface that is in contact with the upper end surface of the coil 21. Have been. As shown in FIG. 2, the upper electrostatic shield 71 is formed in a fan shape in which a part of an annular plate is cut away. That is, the upper electrostatic shield 71 has the notch 711. The lead wire 213 of the high-voltage side winding 211 and the lead wire 214 of the low-voltage side winding 212 are connected to a bushing (not shown) through the notch 711.

  As shown in FIG. 7, the lower electrostatic shield 72 is provided in contact with a surface of the pressing portion 62 of the coil pressing mechanism 60 connected to the lower clamp 52, the surface being opposite to the surface contacting the lower end surface of the coil 21. Have been. The lower electrostatic shield 72 is formed in an annular plate shape as shown in FIG. That is, the lower electrostatic shield 72 has the same configuration as the upper electrostatic shield 71 except that the lower electrostatic shield 72 does not have the cutout portion 711.

  Each of the upper electrostatic shield 71 and the lower electrostatic shield 72 has a flat surface facing the coil 21. Each of the upper electrostatic shield 71 and the lower electrostatic shield 72 is grounded via the ground line 11 and the ground pole 12, and is at the ground potential. As a result, only the upper and lower electrostatic shields 71 and 72 are the members facing the upper and lower surfaces of the coil 21, and the occurrence of electric field concentration on members other than the upper and lower electrostatic shields 71 and 72 is suppressed.

  The upper insulating member 81 and the lower insulating member 82 are made of a member having electrical insulation such as an epoxy resin. As shown in FIG. 6, the upper insulating member 81 is provided at an intermediate portion of the holding portion 62 of the coil holding mechanism 60 connected to the upper clamp 51. In this case, the upper insulating member 81 is provided, for example, so as to be sandwiched between the holding portions 62 divided into upper and lower portions. In the present embodiment, the intermediate portion of the holding portion 62 is defined as a portion between one end surface and the other end surface of the entire holding portion 62, that is, a surface of the holding portion 62 that is in contact with the end surface of the coil 21, and the electrostatic shields 71 and 72. And the surface in contact with.

  As shown in FIG. 3, the upper insulating member 81 is formed in a fan shape in which a part of an annular plate is cut away. That is, the upper insulating member 81 has the notch 813, and has a similar shape to the upper electrostatic shield 71 in a plan view when the content 20 of the device is viewed from above. The lead wire 213 of the high-voltage side winding 211 and the lead wire 214 of the low-voltage side winding 212 are connected to a bushing (not shown) through a notch 813.

  In this case, the outer diameter of the upper insulating member 81 is larger than the outer diameter of the coil 21, and the inner diameter of the upper insulating member 81 is smaller than the inner diameter of the coil 21, that is, the inner diameter of the iron core insertion portion 215. The upper insulating member 81 has an outer bent portion 811 and an inner bent portion 812 as shown in FIG. The outer bent portion 811 is formed so as to bend the radially outer portion of the upper insulating member 81 along the axial direction of the coil 21 on the side opposite to the coil 21, in this case, upward. The inner bent portion 812 is formed so as to bend the radially inner portion of the upper insulating member 81 along the axial direction of the coil 21 on the side opposite to the coil 21, in this case, upward.

  Due to the bent portions 811 and 812, the upper insulating member 81 has a groove shape whose cross section cut along the radial direction is opened toward the opposite side to the upper end surface of the coil 21, in this case, a groove shape opened upward. Is formed. The holding portion 62 of the coil holding mechanism 60 is provided inside the groove of the upper insulating member 81 at a position overlapping the upper insulating member 81 in a plan view. That is, the upper insulating member 81 covers the pressing portion 62 in a state where the upper insulating member 81 extends inward and outward in the radial direction of the coil 21 in plan view, except for the notch portion 813.

  As shown in FIG. 7, the lower insulating member 82 is provided at an intermediate portion of the holding portion 62 of the coil holding mechanism 60 connected to the lower clamp 52. In this case, similarly to the upper insulating member 81, the lower insulating member 82 is provided so as to be sandwiched between the pressing portions 62 divided into upper and lower parts. The lower insulating member 82 has the same configuration as the upper insulating member 81 except that the lower insulating member 82 does not have the notch 813 and that the arrangement is upside down.

  The lower insulating member 82 is formed in an annular shape as shown in FIG. In this case, the lower insulating member 82 has a similar shape to the lower electrostatic shield 72 in a bottom view when the device content 20 is viewed from below, in other words, in a plan view when the device content 20 is viewed from above. The outer diameter of the lower insulating member 82 is larger than the outer diameter of the coil 21, and the inner diameter of the lower insulating member 82 is smaller than the inner diameter of the coil 21, that is, the inner diameter of the iron core insertion portion 215.

  7, the lower insulating member 82 has an outer bent portion 821 and an inner bent portion 822, like the upper insulating member 81. The outer bent portion 821 is formed so as to bend the radially outer portion of the lower insulating member 82 along the axial direction of the coil 21 on the side opposite to the coil 21, in this case, downward. The inner bent portion 822 is formed so that the radially inner portion of the lower insulating member 82 is bent upward along the axial direction of the coil 21 on the opposite side to the coil 21 in this case.

  Due to the bent portions 821 and 822, the lower insulating member 82 has a groove shape whose cross section cut along the radial direction is opened toward the opposite side to the lower end surface of the coil 21, in this case, a groove shape opened downward. Is formed. The holding portion 62 of the coil holding mechanism 60 is provided inside the groove of the lower insulating member 82 and at a position overlapping the lower insulating member 82 in a plan view. That is, the lower insulating member 82 covers the pressing portion 62 in a state of extending inward and outward in the radial direction of the coil 21 in plan view.

  According to the embodiment described above, the mold transformer 10 includes the coil 21, the iron core 22, the clamps 51 and 52, the coil pressing mechanism 60, and the insulating members 81 and 82. The coil 21 has a high-voltage side winding 211 and a low-voltage side winding 212, and is a so-called molded coil in which the surfaces of the windings 211 and 212 are covered with an insulating member. The iron core 22 is passed through an iron core insertion part 215 formed at the center of the coil 21. The clamps 51 and 52 are attached with the upper and lower ends of the iron core 22 protruding from the coil 21 interposed therebetween. The coil holding mechanism 60 has a holding portion 62 in contact with the axial end surface of the coil 21, and holds the coil 21 by pressing the holding portion 62 toward the axial center of the coil 21 with the clamps 51 and 52 as fulcrums. Has functions. The insulating members 81 and 82 are formed of members having electrical insulation properties, and are provided at a portion in the axial direction of the coil 21 in the pressing portion 62 and cover the pressing portion 62 in plan view.

  According to this, since the insulating members 81 and 82 insulate the middle part of the holding part 62 and cover the holding part 62 in a plan view, a barrier effect can be expected. In particular, by providing the path from the coil 21 to the electrostatic shields 71 and 72 along the insulating members 81 and 82, a large creepage distance can be ensured, thereby obtaining a large barrier effect against creepage discharge. Can be. As a result, the dielectric strength of the molded transformer 10 can be improved. In addition, the barrier referred to here is also referred to as a discharge barrier, and is provided on a discharge path to prevent or suppress the generation and progress of discharge, increase a flashover voltage, and improve withstand voltage characteristics of equipment and equipment. Refers to insulation. The barrier effect indicates that the barrier improves the withstand voltage characteristics, that is, the dielectric strength.

  The mold transformer 10 further includes electrostatic shields 71 and 72. The electrostatic shields 71 and 72 are made of a conductive or semiconductive member, and are provided on the opposite side of the holding portion 62 from the coil 21. The insulating members 81 and 82 cover the electrostatic shields 71 and 72 in plan view. That is, the insulating members 81 and 82 are formed in an annular shape whose outer diameter is larger than the outer shape of the electrostatic shields 71 and 72 and whose inner diameter is smaller than the inner diameter of the electrostatic shields 71 and 72. According to this, the creepage distance from the coil 21 to the electrostatic shields 71 and 72 can be further secured. Therefore, the dielectric strength of the molded transformer 10 can be further improved.

  The insulating members 81 and 82 have at least outer bent portions 811 and 821. The outer bent portions 811 and 821 are provided closer to the high-voltage side winding 211 among the radially outer or inner sides of the insulating members 81 and 82, and are formed by bending along the axial direction of the coil 21. I have. According to this, the creepage distance from the high-voltage side winding 211 to the electrostatic shields 71 and 72 on the high-voltage side winding 211 side which requires a higher voltage and higher dielectric strength than the low-voltage side winding 212 is required. It is possible to secure a larger value. As a result, it is possible to further improve the dielectric strength on the high voltage side winding 211 side, which requires a higher dielectric strength.

  Further, in the case of the present embodiment, the insulating members 81 and 82 have inner bent portions 812 and 822 in addition to the outer bent portions 811 and 821. According to this, a long creepage distance can be ensured not only on the high voltage side winding 211 side but also on the low voltage side winding 212 side. As a result, the dielectric strength can be further improved not only on the high-voltage side winding 211 side but also on the low-voltage side winding 212 side.

  Further, in the present embodiment, the bent portions 811, 812, 821, and 822 are bent toward the side opposite to the coil 21. According to this, for example, in the lower part of the coil 21, the gas that is going to flow into the gap 24 of the coil 21 is caught in the bent parts 821 and 822 on the coil 21 side of the lower insulating member 82 and the flow is hindered. Is suppressed. Further, for example, in the upper part of the coil 21, the gas that is about to flow out from the gap 24 of the coil 21 is prevented from being caught in the bent parts 811 and 812 on the coil 21 side of the upper insulating member 81 and obstructing the flow. You.

  That is, according to this configuration, the flow of gas for cooling the coil 21 can be made smoother than in the configuration in which the bent portions 811, 812, 821, and 822 are bent toward the coil 21 side. . As a result, according to the present embodiment, a decrease in cooling efficiency due to the provision of the insulating members 81 and 82 is suppressed, and an improvement in dielectric strength can be achieved while ensuring cooling performance.

In the above embodiment, the insulating members 81 and 82 do not necessarily have to have the bent portions 811, 812, 821, and 822. The insulating members 81 and 82 may be, for example, in a flat plate shape.
Further, the outer bent portions 811 and 821 and the inner bent portions 812 and 822 may be bent in mutually opposite directions.

  As mentioned above, although one embodiment of the present invention was described, this embodiment is given as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the invention described in the claims and equivalents thereof, as are the contents included in the scope and the gist of the invention.

  In the drawing, 10 is a molded transformer (molded stationary induction device), 21 is a coil, 211 is a high voltage side winding, 212 is a low voltage side winding, 213 is a high voltage side lead wire, 214 is a low voltage side lead wire, and 22 is a low voltage side lead wire. Iron core, 51 is an upper clamp (clamp), 52 is a lower clamp (clamp), 60 is a coil holding mechanism, 62 is a holding portion, 71 is an upper electrostatic shield (electrostatic shield), and 72 is a lower electrostatic shield (electrostatic shield). Shield, 81, upper insulating member (insulating member), 811 outer bending portion (bending portion), 812 inner bending portion (bending portion), 82 lower insulating member (insulating member), 821 outer bending portion (bending portion) 822) indicates an inner bent portion (bent portion).

Claims (4)

A coil having a high-voltage side winding and a low-voltage side winding, the surface of which is covered with an insulating member;
An iron core passed through the center of the coil;
A clamp attached to sandwich the end of the iron core protruding from the coil,
A coil presser mechanism having a presser portion in contact with an axial end surface of the coil, and pressing the coil toward the center in the axial direction with the clamp as a fulcrum;
An insulating member which is formed of a member having electrical insulation properties and is provided at an intermediate portion of the pressing portion in the axial direction and covers the pressing portion in plan view,
Molded stationary induction equipment comprising: It is constituted by a member having conductivity or semi-conductivity, and further includes an electrostatic shield provided on the opposite side to the coil with respect to the holding portion,
The insulating member covers the electrostatic shield in a plan view,
The molded stationary induction device according to claim 1. The insulating member is provided at least closer to the high-voltage winding out of the radially outer or inner side, and has a bent portion bent along the axial direction of the coil,
The molded stationary induction device according to claim 1. The bent portion is bent toward a side opposite to the coil,
The molded stationary induction device according to claim 3.

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