JP6335305B2 - Molded transformer - Google Patents

Description

  The present invention relates to a molded transformer.

  As a document disclosing the background art of this technical field, for example, there is Patent Document 1 shown below. In Patent Document 1, a resin-molded cylindrical high-voltage winding (primary coil) and low-voltage winding (secondary coil) are passed through an insulating spacer including an elastic rubber spacer portion and a cured spacer resin portion. Thus, a molded transformer configured to be fixed to a transformer frame is disclosed.

  Generally, a mold transformer is installed and operated in an electric room that is maintained so that outside air does not enter directly. However, in recent years, expansion of the application range of mold transformers is expected. Therefore, there is a possibility that it will be installed in a special environment with a lot of dust, moisture, salt, etc., which has not been assumed as an installation place of mold transformer until now. Needless to say, it is necessary to ensure reliability equivalent to that in an environment prepared so that outside air does not directly enter even in operation in such an environment.

  In an environment with a lot of dust, moisture, and salt, it is necessary to consider the corrosion phenomenon caused by the tracking phenomenon. In particular, the rubber portion of the insulating spacer is deteriorated in corrosion resistance due to adhesion of impurities such as dust, moisture and salt, and increases electric field concentration. As a result, the corrosion of the rubber part progresses and the insulation resistance decreases, so that the tracking phenomenon may proceed together with the insulator block, and there is a possibility that insulation breakdown will occur.

  To improve the insulation of the transformer, ensure a large creepage distance between the coil and the metal other than the coil (distance along the surface of the insulating member disposed between the coil and the metal other than the coil). is necessary. For example, in Patent Document 2 shown below, in the oil-filled transformer, the shape of the insulating material arranged between the coil and the coil pressing metal fitting arranged on the outer periphery of the coil is made longer than the length in the coil axial direction, And the technique of ensuring a creeping distance by making it project up and down rather than the both end surface position of a coil is disclosed.

JP 2000-252138 A JP2009-283686A

  The method disclosed in Patent Document 2 is a method for ensuring insulation between a coil and a metal located outside the coil by taking the shape of the insulating material longer than the length in the coil axial direction. On the other hand, in the molded transformer as shown in Patent Document 1, it is necessary to secure a creepage distance between the coil and the frames located at the upper and lower ends of the coil. Therefore, even if the method disclosed in Patent Document 2 is applied to the mold transformer, that is, the insulator is provided on the outer periphery of the coil and the shape of the insulating material is longer than the length in the coil axial direction, the coil, The creepage distance between the frames located at the upper and lower ends of the coil cannot be increased.

  An object of the present invention is to provide a method for ensuring appropriate insulation in a molded transformer.

A molded transformer according to an embodiment of the present invention includes a cylindrical primary coil, a cylindrical secondary coil disposed in a state where a predetermined space is provided inside the primary coil, an upper frame, and a lower frame. The primary and secondary coils are supported by a plurality of support structures. A plurality of support structures are provided between the upper and lower ends of the primary and secondary coils and the frame, respectively, and the insulator block and a wide area having a larger area than the bottom area of the insulator block. It is composed of an insulating plate. The insulator block is in contact with the ends of the primary and secondary coils, and a wide insulating plate is disposed between the insulator block and the frame.
A plurality of the support structures are provided between the lower ends of the primary and secondary coils and the frame,
The wide insulating plate is provided with a slope,
An end portion of the wide insulating plate provided at a lower end portion of the primary and secondary coils is located below a center portion of the wide insulating plate.
A plurality of the support structures are provided between upper ends of the primary and secondary coils and a frame positioned on the upper ends of the primary and secondary coils;
The wide insulating plate is provided with a slope,
An end portion of the wide insulating plate provided at an upper end portion of the primary and secondary coils is located below a center portion of the wide insulating plate.

  ADVANTAGE OF THE INVENTION According to this invention, the creeping distance of an insulator block part can be taken long, and the reliability of a mold transformer improves.

1 is a front view of a molded transformer according to Embodiment 1. FIG. 1 is a side view of a molded transformer according to Embodiment 1. FIG. It is sectional drawing of the transformer coil which concerns on Example 1, and sectional drawing of the support structure which supports this. 1 is a perspective view of a support structure according to Example 1. FIG. It is sectional drawing of the support structure located in the transformer coil upper end part which concerns on Example 1. FIG. It is sectional drawing of the transformer coil which concerns on Example 2, and the support structure which supports this. 6 is a perspective view of a support structure according to Embodiment 2. FIG. It is a figure showing the shape of the wide insulating board at the time of arrange | positioning the support structure which concerns on the modification of Example 2 to the coil lower end. It is sectional drawing of the transformer coil which concerns on Example 3, and the support structure which supports this. 10 is a perspective view of a support structure according to Embodiment 3. FIG. It is sectional drawing at the time of arrange | positioning a shock absorbing material under a wide insulating board. 6 is a sectional view of a secondary coil according to Embodiment 4. FIG. It is sectional drawing of the transformer coil which concerns on Example 5, and sectional drawing of the support structure which supports this. 10 is a perspective view of a support structure according to Embodiment 5. FIG. 10 is a structural diagram of a support structure according to Embodiment 5. FIG. FIG. 10 is a structural diagram of a support structure according to Example 6.

  Hereinafter, a transformer according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below.

  The first embodiment will be described below with reference to the drawings. FIG. 1 is a front view of a molded transformer 100 according to the first embodiment, and FIG. 2 is a side view of the molded transformer 100.

  In the molded transformer 100 according to the first embodiment, a cylindrical primary coil 1 and a secondary coil 2, for example, a cylindrical shape, are supported by a metal frame 20 via a plurality of insulator blocks 5 and metal fittings 7. . The frame 20 includes a frame 20 a located at the lower part of the mold transformer 100 and a frame 20 b located at the upper part of the mold transformer 100. Hereinafter, when the frame 20a and the frame 20b are referred to without being distinguished from each other, they are referred to as “frame 20”. Moreover, in this specification, the insulator block 5, the metal fitting 7, and the frame 20 are called a support structure part.

  FIG. 3 shows a cross section of the coil (primary coil 1, secondary coil 2) and the support structure portion located at the lower end of the coil in the molded transformer 100. FIG. 4 is a perspective view of the support structure. Both the primary coil 1 and the secondary coil 2 are molded with resin 3 and are coaxially arranged in the radial direction. In FIG. 3, the left side corresponds to the center direction of the cylinder, and the right side corresponds to the outer peripheral direction of the cylinder. Both the primary coil 1 and the secondary coil 2 are molded with resin 3 (see FIG. 3). The secondary coil 2 is coaxially arranged inside the primary coil 1, and a space 11 (see FIG. 3) is provided between the primary coil 1 and the secondary coil 2. An iron core 13 is provided inside the secondary coil 2. In the molded transformer according to the first embodiment, the primary coil 1 is a high voltage coil and the secondary coil 2 is a low voltage coil.

  The insulator block 5 has a first support portion 5a for supporting the primary coil 1 and a second support portion 5b for supporting the secondary coil 2 on the upper surface thereof. The insulator block 5 is made of an insulator such as a glass laminate. Further, a buffer material 4 such as silicone rubber is inserted between the primary coil 1, the secondary coil 2, and the insulator block 5. A plurality of metal fittings 7 for fixing the insulator block 5 are attached on the frame 20a of the molded transformer 100, and the insulator block 5 is disposed on the metal fitting 7 on the frame 20 of the transformer. Further, in order to prevent the insulator block 5 from shifting, the insulator block 5 and the metal fitting 7 are fixed by the position holding pins 6.

  FIG. 3 is a cross-sectional view showing one of the support structures located at the lower ends of the primary coil 1 and the secondary coil 2 of the molded transformer 100 according to the first embodiment. The upper end portion of the secondary coil 2 also has a configuration that is substantially symmetrical with that in FIG. FIG. 5 shows a cross-sectional view of the support structure portion positioned at the upper ends of the primary coil 1 and the secondary coil 2 of the molded transformer 100 according to the first embodiment. In this case, the insulator block 5 is used upside down from the direction shown in FIG. That is, the first support portion 5 a is disposed so as to contact the upper end of the primary coil 1, and the second support portion 5 b is disposed so as to contact the upper end of the secondary coil 2. The insulator block 5 located at the upper ends of the primary coil 1 and the secondary coil 2 is connected to the metal fitting 7 and the frame 20b on the upper side by bolts 15.

  When the inventor of the present application performed an electric field analysis based on the analysis system shown in FIGS. 3 and 4, it was found that an electric field was applied to the corner portion of the buffer material 4. Under the normal arrangement environment of the mold transformer (environment such as an electric room arranged so that outside air does not directly enter), the corrosion resistance is not lowered even with the structure of the conventional mold transformer. However, when a mold transformer is installed in a special environment with a lot of dust, moisture, salt, etc., the electric field increases due to the influence of dust, moisture, salt, etc. adhering to the silicone rubber part, and the resistance of the silicone rubber surface due to partial discharge is increased. Corrosion is reduced. And the electric discharge corrosion which generate | occur | produced in the silicone rubber progresses to the insulator block 5 gradually, and leads to dielectric breakdown.

  Since the time until the dielectric breakdown increases as the distance between the primary coil 1 and the metal fitting 7 of the transformer increases, it can be improved by increasing the height of the insulator block 5 and increasing the creepage distance. For this reason, it is desirable to ensure the height of the insulator block 5 to some extent. As an example, the height from the bottom of the insulator block 5 to the upper surface of the first support 5a may be about 10 cm.

  In the transformer according to the first embodiment, the primary coil 1 is a high voltage coil and the secondary coil 2 is a low voltage coil. Therefore, it is more important to increase the creepage distance between the primary coil 1 and the frame 20 (or the metal fitting 7). Therefore, the height of the 1st support part 5a is made higher than the height of the 2nd support part 5b.

  In addition, a recess is provided between the first support portion 5a and the second support portion 5b of the insulator block 5. Thereby, the creeping distance between the primary coil and the secondary coil can be increased. It is important to periodically clean and inspect molded transformers placed in special environments with a lot of dust, moisture, and salt. Some mold transformers employ a structure in which an insulating film is disposed independently in the space portion 11 of the primary coil and the secondary coil, but when a film is disposed in the space portion 11, the state of the secondary coil Confirmation becomes difficult. With this structure, the state of the contact portion 4a between the primary coil 1 and the buffer material 4 and the state of the contact portion 4b between the secondary coil 2 and the buffer material 4 can be easily confirmed visually, and maintenance such as cleaning is performed. Also improves.

  Next, Example 2 of the present invention will be described with reference to FIGS. The structure of the molded transformer according to the second embodiment is the same as that of the molded transformer according to the first embodiment except for the structure of the support structure. Therefore, below, it demonstrates focusing on a support structure part. FIG. 6 is a cross-sectional view illustrating one of the support structure portions located at the lower ends of the primary coil 1 and the secondary coil 2 of the molded transformer according to the second embodiment. In addition to the structure described in the first embodiment, the support structure according to the second embodiment is a flat plate having an area larger than the bottom areas of the insulator block 5 and the metal fitting 7 below the insulator block 5. A certain wide insulating plate 8 is arranged. Further, as in the first embodiment, the support structure portion positioned at the upper ends of the primary coil 1 and the secondary coil 2 is configured substantially symmetrically with FIG. However, the wide insulating plate 8 is not provided between the insulator block 5 and the metal fitting 7. Below, it demonstrates centering on the support structure part located in the lower end part of a coil.

  In order to prevent the insulator block 5 and the wide insulating plate 8 from shifting, the insulator block 5 and the wide insulating plate 8 are fixed to the metal fitting 7 by the position holding pins 6 ′. The wide insulating plate 8 is provided in order to extend the creeping distance between the coil and the metal fitting 7 or the frame 20. Therefore, the wide insulating plate 8 is at least wider (circumferential length) and longer (radial length) than the insulator block 5 and / or the metal fitting 7.

  Since the wide insulating plate 8 is not integrated with the insulator block 5 and is a separate structure, members of various materials can be used for the wide insulating plate 8 as long as it is an insulator. . For example, a glass laminate or the like used in the insulator block portion 5 may be used, or a member made of a material different from that of the insulator block portion 5 may be used.

  By adopting the configuration in which the wide insulating plate 8 is inserted, the creeping distance from the coil to the metal fitting 7 (or the frame 20) is extended. The longer the creepage distance from the coil to the metal fitting 7, the longer the time until dielectric breakdown occurs. By disposing the wide insulating plate 8 as shown in FIG. 7, the surface distance of the wide insulating plate 8 in the height dimension of the insulator block 5 is also the creeping distance (the section L indicated by the dotted line in FIG. 6 is the creeping distance). Is). Therefore, the time until dielectric breakdown can be lengthened.

  Further, since the wide insulating plate 8 and the insulator block 5 are separable, the insulator block 5 and the wide insulating plate 8 can be exchanged separately. Moreover, it becomes easy to apply the insulator block 5 to transformers of various sizes. When the wide insulating plate 8 is integrated with the insulator block 5, the wide insulating plate 8 may interfere with other structures when the insulator block 5 is disposed in a small transformer. Various types of wide insulating plates 8 are prepared, and different sizes of the wide insulating plates 8 are appropriately selected according to the size of the transformer to be arranged. This can be commonly applied to other transformers, and the manufacturing cost of the insulator block 5 can be reduced.

[Modification]
A modified example of the support structure portion of the molded transformer according to the second embodiment will be described with reference to FIG. In the second embodiment, the configuration example in which the wide insulating plate 8 has a flat surface has been described. However, the shape of the wide insulating plate 8 is not limited to a flat surface. In the modification, an example in which the wide insulating plate 8 is provided with an inclination, that is, the wide insulating plate 8 having a shape in which the end of the wide insulating plate 8 is lowered from the center portion will be described.

  FIG. 8 shows an example of the structure of the wide insulating plate 8 'provided with an inclination. FIG. 8 is a configuration diagram when the insulator block 5, the metal fitting 7, and the wide insulating plate 8 ′ are viewed from the outside of the transformer toward the center when the insulator block 5 is disposed at the lower end of the coil. . As described above, the structure in which the outer side of the wide insulating plate 8 ′ is lower than the central portion can prevent water droplets or the like from staying on the surface of the wide insulating plate 8 ′. The shape of the wide insulating plate 8 'is not limited to the shape shown in FIG. Various shapes can be used as long as the end portion is lower than the center portion and water droplets or the like attached to the upper surface hardly stay. For example, a trapezoidal wide insulating plate may be used.

  Further, in the case of adopting a structure in which the wide insulating plate 8 is inclined, the wide inclined plate 8 arranged at the lower end of the coil has the end of the wide insulating plate 8 'lowered from the center as shown in FIG. Arrange to be in position.

  If the wide insulating plate 8 and the insulator block 5 are integrally molded (hereinafter, the wide insulating plate 8 and the insulator block 5 are integrally molded is referred to as a “wide insulator block”) to be disposed at the lower end. The wide insulator block and the wide insulator block for disposing at the upper end portion must be prepared separately. As shown in FIG. 8, the wide insulating block for disposing at the lower end has a structure in which the end of the wide insulating plate portion is lowered from the center when disposed at the lower end. If this is arranged at the upper end as it is, the end of the wide insulating plate portion faces upward at the upper end, which is not preferable because water droplets or the like tend to collect. For this reason, the wide insulator block disposed at the upper end portion needs to have a structure different from that disposed at the lower end portion (for example, an insulator block having no wide insulating plate portion).

  If the wide insulating plate and the insulator block are separated as in the second embodiment or the present modification, only the insulator block is disposed at the upper end portion, and the wide insulating plate is not provided. It is possible to prevent water droplets or the like from staying on the surface of the object block 5. Therefore, it is possible to use the same insulator block for both the upper end portion and the lower end portion. The insulator block for disposing at the lower end portion and the insulator block for disposing at the upper end portion are separately provided. There is no need to create it.

  Moreover, although the structure which does not provide a wide insulating board in an upper end part was demonstrated above, you may provide a wide insulating board in an upper end part. In that case, it is preferable to install the wide insulating plate 8 ′ in the same direction as the case where the wide insulating plate 8 ′ is arranged at the lower end. In other words, it may be installed so that the outer side of the wide insulating plate 8 ′ is lower than the center part. Then, as in the case where the wide insulating plate 8 ′ is installed at the lower end, it is possible to prevent water droplets or the like from staying near the insulator block provided at the upper end.

  Subsequently, a third embodiment of the present invention will be described with reference to FIGS. The structure of the molded transformer according to the third embodiment is the same as that of the molded transformer according to the first embodiment except for the structure of the support structure. FIG. 9 shows a cross section of a coil (primary coil 1, secondary coil 2) and a supporting structure (insulator block 5, metal fitting 7, frame 20) that supports the coil (primary coil 1, secondary coil 2) in the molded transformer according to the third embodiment. It is. FIG. 10 is a perspective view of the support structure.

  In the molded transformer according to the first embodiment, the buffer material 4 is disposed between the coil and the insulator block 5. On the other hand, in the molded transformer according to the third embodiment, the buffer material 4 is disposed under the insulator block 5, and the primary coil 1 and the secondary coil 2 are directly supported by the insulator block 5. Other points are the same as those of the transformer according to the first embodiment.

  Silicone rubber used for the buffer material 4 has a lower relative dielectric constant than the resin block 3 in which the coil is molded, an insulator block 5 made of a glass laminate, and the like, and easily causes dielectric breakdown. Therefore, in the molded transformer according to the third embodiment, the buffer material 4 is arranged at a location far from the coil, thereby reducing the concentration of the electric field and making it difficult to cause dielectric breakdown.

  Further, the above description is based on the structure described in FIG. 3, that is, the structure without the wide insulating plate 8, but the method of the third embodiment can also be applied to the structure of the transformer according to the second embodiment. FIG. 11 shows an example of the configuration. FIG. 11 shows a structure in which Example 2 and Example 3 are combined. A wide insulating plate 8 is arranged under an insulator block 5 such as a glass laminate, and silicone rubber is interposed between the wide insulating plate 8 and the metal fitting 7. A cushioning material 4 such as is provided. With such a structure, the creeping distance between the coil and the metal fitting 7 can be extended, and the electric field concentration on the buffer material 4 can be reduced.

  As yet another embodiment, the buffer material 4 may be provided between the insulator block 5 and the wide insulating plate 8.

  Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

  FIG. 12 is a cross-sectional view of the secondary coil 2 of the molded transformer according to the fourth embodiment. The configuration of the molded transformer according to the fourth embodiment is the same as that of the first, second, or third embodiment except that the insulating film made of the insulating paper 9 and the insulating tape 10 is disposed on the outer peripheral portion of the secondary coil 2. This is the same as the molded transformer according to the above.

  By affixing the insulating paper 9 and the insulating tape 10 to the outer peripheral part of the secondary coil 2, the fouling resistance and pressure resistance of the transformer can be improved. Moreover, since this improves insulation, the space (for example, the space part 11 in FIG. 3) between the primary coil 1 and the secondary coil 2 may be made narrower. In that case, since the primary coil 1 can be reduced in diameter, the transformer can be reduced in size.

  Maintenance is also important for the use of mold transformers in special environments with a lot of dust, moisture and salt. As described in the first embodiment, the insulating performance is improved by the method of disposing an insulating film in the space portion 11 of the primary coil 1 and the secondary coil 2, and the insulation distance between the coils is reduced to reduce the size of the transformer. be able to. However, cleaning is also important in the use of mold transformers in special environments with a lot of dust, moisture and salt. If this structure is used, it is difficult to clean the secondary coil if an insulator is placed in the space. By using this structure, it is possible to achieve both reduction in size of the transformer and improvement in maintainability.

  Then, the structure of the mold transformer which concerns on Example 5 is demonstrated. FIG. 13 is a cross-sectional view of a transformer coil (primary coil 1 and secondary coil 2) of a molded transformer according to the fifth embodiment and a support structure that supports the coil. FIG. 14 is a perspective view of the support structure according to the fifth embodiment, and FIG. 15 is a structure diagram of the support structure according to the fifth embodiment.

  In the molded transformer according to the second embodiment, as shown in FIG. 6, the wide insulating plate 8 is disposed between the insulator block 5 and the transformer fitting 7 and has a structure that ensures a creepage distance L. . On the other hand, in the molded transformer according to the fifth embodiment, as shown in FIG. 13, the wide creepage distance is further extended by arranging the wide insulating plates 8 a and 8 b at the upper and lower portions of the insulator block 5, respectively. ing. The other points of the molded transformer according to the fifth embodiment are the same as those of the molded transformer according to the first to fourth embodiments.

  However, the wide insulating plates 8a and 8b do not have a structure directly molded on the insulator block 5 by machining or the like. As shown in FIG. 15, grooves for fitting the wide insulating plates 8 a and 8 b into the insulator block 5 are molded. Then, the wide insulating plates 8a and 8b are fitted into the grooves, thereby forming a support structure as shown in FIG.

  When a gap is generated between the groove and the wide insulating plates 8a and 8b in the fitting portion between the insulator block 5 and the wide insulating plates 8c and 8d, the gap is filled with silicon or an insulating resin. Of course, a precise fitting dimension may be formed by machining so that no gap is generated between the groove provided in the insulator block 5 and the wide insulating plates 8a and 8b. However, by filling the gap with silicon or an insulating resin, it becomes easier to prevent an electric circuit from being formed through the groove portion formed in the insulator block 5 when the tracking phenomenon occurs. With this structure, when an electric circuit is formed on the insulator block 5 and the wide insulating plates 8a and 8b by tracking or the like, the insulating performance can be easily recovered by replacing the wide insulating plates 8a and 8b. it can. Also, the insulating property of the insulator block 5 can be recovered by polishing the surface of the formed electric circuit with a file or by applying an insulating paint or varnish.

  In the present embodiment, an example in which two wide insulating plates are arranged in the insulator block 5 has been described. However, the wide insulating plates may be arranged in only one place. For example, only the wide insulating plate 8b may be arranged.

  FIG. 16 is a structural diagram of a support structure for a molded transformer according to the sixth embodiment. The structure of the molded transformer according to the sixth embodiment is the same as that of the molded transformer according to the first to fifth embodiments except for the points described below (the structure of the support structure).

  In the fifth embodiment, the example in which the creeping distance is extended by fitting the wide insulating plates 8a and 8b from one direction to the insulator block 5 has been described. In the molded transformer according to the sixth embodiment, as shown in FIG. 16, a groove is formed once in the circumferential direction with respect to the insulator block 5. Then, the wide insulating plates 8c and 8d are inserted into the formed groove portion. At this time, the wide insulating plates 8c and 8d are arranged so that the insulator block 5 is sandwiched between the wide insulating plates 8c and 8d. About the fitting part of the insulator block 5 and the wide insulating plates 8c and 8d, the gap may be filled with silicon, insulating resin, or the like as in the fifth embodiment.

  The above is the description of the embodiment of the present invention. In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, in each of the embodiments described above, an example in which the coil is cylindrical has been described. However, the shape of the coil is not limited to a cylindrical shape. For example, it may be rectangular. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

  For example, in each of the embodiments described above, an example in which the coil is cylindrical has been described. However, the shape of the coil is not limited to a cylindrical shape. For example, it may be rectangular. Moreover, it is also possible to make the 1st support part and 2nd support part of an insulator block another structure. In addition, it is also possible to add, delete, and replace other components for a part of the configuration of each embodiment.

1: Primary coil 2: Secondary coil 3: Resin 4: Buffer material such as silicone rubber 5: Insulator block 6: Position holding pin 7: Transformer fitting 8 (8a, 8b, 8c, 8d): Wide insulating plate 9 : Insulating paper 10: Insulating tape 11: Space 13: Iron core 20: Frame

Claims (9)

A molded transformer having a primary coil, a secondary coil disposed in a state where a predetermined space is provided inside the primary coil, a frame, and a plurality of support structures that support the primary and secondary coils. There,
The support structure includes an insulator block and a wide insulating plate having an area larger than a bottom area of the insulator block, and a plurality of the support structures are provided between the ends of the primary and secondary coils and the frame. Because
The upper surface of the insulator block is provided with a first support portion for supporting an end portion of the primary coil and a second support portion for supporting an end portion of the secondary coil, and the lower surface of the insulator block and the frame In between, the wide insulating plate is arranged ,
A plurality of the support structures are provided between the lower ends of the primary and secondary coils and the frame,
The wide insulating plate is provided with a slope,
The molded transformer , wherein an end of the wide insulating plate provided at a lower end portion of the primary and secondary coils is located below a central portion of the wide insulating plate . A molded transformer having a primary coil, a secondary coil disposed in a state where a predetermined space is provided inside the primary coil, a frame, and a plurality of support structures that support the primary and secondary coils. There,
The support structure includes an insulator block and a wide insulating plate having an area larger than a bottom area of the insulator block, and a plurality of the support structures are provided between the ends of the primary and secondary coils and the frame. Because
The upper surface of the insulator block is provided with a first support portion for supporting an end portion of the primary coil and a second support portion for supporting an end portion of the secondary coil, and the lower surface of the insulator block and the frame In between, the wide insulating plate is arranged,
A plurality of the support structures are provided between upper ends of the primary and secondary coils and a frame positioned on the upper ends of the primary and secondary coils,
The wide insulating plate is provided with a slope,
The molded transformer, wherein an end of the wide insulating plate provided at an upper end portion of the primary and secondary coils is located below a central portion of the wide insulating plate. 3. The molded transformer according to claim 1, wherein the insulator block, the wide insulating plate, and a metal fitting attached to the frame are fixed by position holding pins. 4. The molded transformer according to any one of claims 1 to 3, wherein the insulator block has a groove, and the wide insulating plate is inserted into the groove. The height of the first support part is higher than the height of the second support part,
The molded transformer of any one of Claims 1 thru | or 4 . A recess is provided between the first support part and the second support part,
The molded transformer according to any one of claims 1 to 5 . Between the ends of the primary and secondary coils and the insulator block, a cushioning material is disposed,
The mold transformer according to any one of claims 1 to 6 . A cushioning material is disposed between the insulator block and the frame.
The molded transformer of any one of Claims 1 thru | or 7 . An insulating film is disposed on the outer periphery of the secondary coil,
The molded transformer according to any one of claims 1 to 8 .

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