oil-filled transformer

Abstract

The design aims to simplify the structure that suppresses winding deformation while preventing short-circuit mechanical forces from being transmitted to the iron core. [Solution] The oil-filled transformer according to the embodiment includes a support plate positioned between the outer legs on both sides of the iron core where no windings are wound and the windings. The support plate has a main surface portion located between the outer legs and the windings, and a pair of lateral bent portions bent laterally at both ends in the width direction of the main surface portion so as to sandwich the outer legs, and its cross-section is U-shaped. The length of the bend is set so that when an external force acts on the main surface portion from the windings, the external force is transmitted to the lateral support member through the lateral bent portions.

Description

[Technical Field]

[0001] Embodiments of the present invention relate to oil-filled transformers. [Background technology]

[0002] In static induction equipment, such as three-phase transformers, there are five-legged core structures with outer legs on both the left and right sides of the three-phase coil. In this case, windings are wound around each of the three legs excluding the outer legs, and deformation of these windings can compress the adjacent outer legs, worsening iron loss. Specifically, for example, if a short-circuit current flows through the winding due to a short circuit on the load side, a repulsive force due to electromagnetic mechanical force is generated between the inner and outer windings. The inner winding deforms inward and the outer winding deforms laterally, and this short-circuit mechanical force acts on the outer leg. Therefore, as described in Patent Document 1, for example, an E-shaped metal fitting is placed between the outer leg portion and the winding, and an outer retaining fitting surrounds the entire iron core, including the outer leg portion, in order to suppress deformation of the winding and protect the iron core. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2019-33119 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] The E-shaped bracket described above has its base located between the outer leg portion and the winding, and the central plate portion extending from the base is longer than the plate portions at both ends. Therefore, when the winding is deformed outward by a short-circuit mechanical force, only the central plate portion of the E-shaped bracket comes into contact with the outer retaining bracket, making the contact portion of the outer retaining bracket more susceptible to outward deformation. In this case, deformation of the outer retaining bracket may cause the short-circuit mechanical force to act on the outer legs, and to prevent this, it is necessary to reinforce the tip of the central plate portion by providing a separate reinforcing member, thus presenting unique challenges that need to be addressed.

[0005] Therefore, the present invention provides an oil-immersed transformer that simplifies the winding deformation configuration while preventing short-circuit mechanical forces from being transmitted to the iron core. [Means for solving the problem]

[0006] The oil-filled transformer according to this embodiment has a transformer body having a plurality of iron cores and a plurality of windings wound around the legs of these iron cores, which is housed in a tank and filled with insulating oil. The transformer body is, A frame-like support member skeleton surrounding the plurality of iron cores, comprising an upper support member and a lower support member positioned above and below the plurality of iron cores, and left and right lateral support members positioned on the left and right sides to connect the ends of the upper and lower support members, the support member skeleton holding the plurality of iron cores, A support plate is positioned between the outer legs on both sides of the plurality of iron core legs that do not have the winding wound around them and the winding, The receiving plate comprises a main surface portion located between the outer leg portion and the winding, and a pair of lateral bent portions that are bent laterally at both widthwise ends of the main surface portion so as to sandwich the outer leg portion, and the cross-section is U-shaped. The bending length is set such that when an external force acts on the main surface from the winding, the external force is transmitted to the lateral support member through the lateral bending portion. [Brief explanation of the drawing]

[0007] [Figure 1] Schematic diagram illustrating the overall configuration of the transformer in the first embodiment. [Figure 2] Perspective view showing the transformer body [Figure 3] Exploded perspective view showing the state where the horizontal support member and the insulator on the right side of the transformer body are removed [Figure 4] (a) and (b) are a plan view and a perspective view showing the receiving plate [Figure 5] (a) and (b) are perspective views of the horizontal support member seen from the inner side and the side [Figure 6] Cross-sectional view showing the configuration near the outer leg portion of the transformer body [Figure 7] Cross-sectional view showing the configuration near the outer leg portion of the transformer body in the second embodiment

Mode for Carrying Out the Invention

[0008] <First Embodiment> Hereinafter, the first embodiment applied to, for example, a three-phase transformer having a five-leg core structure will be described with reference to FIGS. 1 to 6. FIG. 1 shows a schematic diagram representing the internal configuration of a three-phase oil-immersed transformer 1 as a static induction device of the present embodiment

[0009] In the oil-immersed transformer 1 shown in FIG. 1, the outer tank 2 has a tank body 2a that houses the transformer body 3 and a cover 2b that covers the upper surface opening of the tank body 2a, and is filled with insulating oil 4 The transformer body 3 includes, for example, four cores 5 shown in the front view of FIG. 1 , -4 , -1 ~ five -4 and the legs 6 of this core 5 -1 ~ five -4 Around which, for example, three windings 7 are wound -2 ~ seven -4 and a support member framework 10 that surrounds the periphery of this core 5 -1 ~ seven -3 And is provided. Hereinafter, in the front view of FIG. 1, the direction in which the cores 5 -1 ~ five -4 are arranged is defined as the left-right direction, and the direction perpendicular to the paper surface of the figure is defined as the front-back direction (see the arrows for front, back, left, and right in FIG. 2). -1 ~ five -4 And the front-back direction is the direction perpendicular to the paper surface of the figure (see the arrows for front, back, left, and right in FIG. 2).

[0010] The aforementioned iron core 5 -1 ~5 -4 In Figures 1 and 2, the symbol "5" is used. -1 ,5 -2 ,5 -3 ,5 -4 As shown in the diagram, they are arranged in a single line from left to right. Iron core 5 -1 ~5 -4 For example, it is composed of an amorphous iron core, which is made by winding and laminating amorphous metal material as a thin strip-shaped iron core material.

[0011] Iron core 5 -1 ~5 -4 Both are divided into a front and a rear section (see the iron core 5 in Figure 6, which will be described later). -1 ,5 -1 (See reference), the iron core 5 at the front -1 ~5 -4 And the rear iron core 5 -1 ~5 -4 There is a gap S1 between them. Note that the following refers to Iron Core 5 -1 ~5 -4 , leg 6 -1 ~6 -5 , winding 7 -1 ~7 -3 To simplify the explanation, these parts will be collectively referred to simply as "iron core 5," "legs 6," and "winding 7."

[0012] As shown in Figure 1, the iron core 5 is connected to the winding 7 -1 ,7 -2 ,7 -3 Three inner leg sections 6 are wrapped around it. -2 ,6 -3 ,6 -4 And two outer leg sections 6 are positioned on both the left and right sides. -1 ,6 -5 And so it is equipped with a three-phase five-legged iron core. In this case, inner leg portion 6 -2 Iron core 5 -1 and 5 -2 It is composed of a combination of mutually adjacent leg sections. Similarly, the inner leg section 6 -3 and inner leg portion 6 -4 Iron core 5 -2 and 5 -3 , and 5 -3 and 5-4 Each of these is composed of a combination of adjacent leg sections. On the other hand, the outer leg 6 -1 and 6 -5 The outermost iron core 5 -1 and 5 -4 It is composed of the leg portions. Each of these leg portions 6 has a rectangular cross-section (outer leg portion 6 in Figure 6). -1 reference).

[0013] As shown in Figures 1 and 2, winding 7 -1 ,7 -2 ,7 -3 These are three windings (3 units) for the three phases, and the inner leg portion 6 -2 ,6 -3 ,6 -4 It has an inner winding 7a (see Figure 6) wound around the inner winding and an outer winding 7b (see Figure 6) wound around the outer circumference of the inner winding. As shown in the enlarged view of Figure 6, for example, winding 7 -1 The cross-section of the winding 7 (and the other windings 7 as well) has a rectangular inner surface and a rectangular outer surface with rounded corners. Therefore, the winding 7 -1 The right side of the surface is a flat surface and the outer leg portion 6 -1 Opposite the inner circumferential surface, winding 7 -3 The left side surface is also a flat surface and the outer leg portion 6 -5 It faces the inner circumferential surface (see Figure 1).

[0014] As shown in Figure 2, in the transformer body 3, the support member frame 10 is the iron core 5 -1 ~5 -4 It is formed in a frame-like shape that surrounds the iron core 5 -1 ~5 -4 Winding 7 -1 ~7 -3 Keep each one. In other words, the support member frame 10 is made of an iron core 5 -1 ~5 -4 The structure includes an upper support member 13 and a lower support member 14 positioned above and below the structure, and a right lateral support member 11 and a left lateral support member 12 positioned on the right and left sides to connect the ends of the upper and lower support members, forming a frame shape overall.

[0015] In this case, the upper support member 13, the lower support member 14, the right lateral support member 11, and the left lateral support member 12 (these are also simply referred to as "support members" 11-14) are all formed from, for example, steel plates. The upper support member 13 shown in Figure 2 has a "U" shape in its vertical cross-section, and the iron core 5 -1 ~5 -4 It is positioned to cover (fit into) the upper end of the winding 7. -1 Winding 7 from the right end -3 It is set to correspond to the length to the left end. In this case, flange portions 13a and 13b (see Figure 3) with screw holes are provided at both ends (left and right) of the upper support member 13 so as connecting parts for connecting to the left and right lateral support members 11 and 12, and are provided so as to extend forward and backward.

[0016] Similarly, the lower support member 14 has a vertical cross-sectional shape that is "U" shaped, and the iron core 5 -1 ~5 -4 It is positioned to cover the lower end of the winding 7. Also, as shown in Figures 2 and 3, the lower support member 14 has dimensions in the left-right direction that are such that they cover the winding 7. -1 Winding 7 from the right end -3 It is set to correspond to the length to the left end, and flange portions 14a and 14b are provided at both ends, each having screw holes for connecting to the left and right lateral support members 11 and 12.

[0017] Here, Figures 5(a) and (b) show perspective views of the right lateral support member 11 as seen from the inside and the side. The right lateral support member 11 has the same form as the left lateral support member 12, and as shown in Figure 2, the lateral support members 11 and 12 are arranged symmetrically on the left and right sides of the transformer body 3. Therefore, the following explanation will focus on the configuration of the right lateral support member 11.

[0018] As shown in Figures 5(a)(b) and 6, the lateral support member 11 is open on the inside and has outer leg portion 6 -1 It is formed in a vertically elongated, roughly rectangular box shape capable of accommodating [the item]. In detail, the lateral support member 11 has outer leg portion 6 -1It integrally comprises a main surface portion 11a corresponding to the right side, bent portions 11b and 11c on its front and rear sides, and an upper surface portion 11d and a lower surface portion 11e, forming a rectangular box shape.

[0019] Of these, the bent portions 11b and 11c are bent inward at both ends in the width direction of the lateral support member 11 (both ends in the front-rear direction of the main surface portion 11a), sandwiching a pair of lateral bent portions 21 and 22 of the receiving plate 20 (see Figure 6), and overlapping with the lateral bent portions 21 and 22. Thus, the pair of bent portions 11b, 11c (also referred to as superimposed bent portions 11b, 11c) are formed by bending at a right angle to the main surface portion 11a. However, they may also be integrally attached to the main surface portion 11a by welding or the like, rather than being formed by bending.

[0020] As shown in Figures 5(a)(b) and 6, the lateral support member 11 is provided with flange portions 11f and 11g positioned on the tip side of the bent portions 11b and 11c. Of these, flange portion 11f is formed to bend (protrude) forward from the tip side of the bent portion 11b, and flange portion 11g is formed to bend backward from the tip side of the bent portion 11c, and each has a flange shape. The flange portions 11f and 11g of the lateral support member 11 are combined with the flange portion 13a of the upper support member 13 and the flange portion 14a of the lower support member 14 (see Figures 2 and 3), and are attached and fixed by screws (not shown) inserted through the screw holes.

[0021] As shown in Figures 5(a) and 6, the lateral support member 11 is provided with reinforcing ribs 11h that extend vertically and are positioned on the inside of its main surface portion 11a. The reinforcing rib 11h is formed from the same steel plate as the support member 11, for example, and extends from the upper surface portion 11d to the lower surface portion 11e. Also, as shown in Figure 6, the reinforcing rib 11h is located in the center of the main surface portion 11a in the front-rear direction and has outer leg portion 6 -1 ,6 -1It is configured to be inserted into the gap S1 therebetween. As a result, the reinforcing rib 11h functions as a reinforcing part that suppresses deformation (see the chain double-dashed line C1 in FIG. 5(b)) in which the main surface portion 11a of the lateral support member 11 is curved like an arc.

[0022] Also, as shown in FIG. 6, when the reinforcing rib 11h is inserted up to its proximal end side into the outer leg portions 6 -1 ,6 -1 , the tip side thereof protrudes slightly (for example, about 5 mm, protruding from the outer leg portion 6 -1 ), and it is set to a protruding length that can abut against the main surface portion 23 of the receiving plate 20. As a result, even if a short-circuit mechanical force as shown by the arrow A1 acts from the main surface portion of the receiving plate 20, the reinforcing rib -1 -1 is configured to be received by the lateral support member 11 without transmitting this to the outer leg portion 6.

[0023] Note that a suspended portion 11i is provided on the upper surface portion 11d of the lateral support member 11 as shown in FIG. 5. The suspended portion 11i corresponds to a connection portion with a suspension bolt (not shown) fixed to the cover 2b side of the tank 2 for suspending the entire transformer body 3 including the support member skeleton 10.

[0024] And, among the leg portions 6 of each of the iron cores 5 described above, a receiving plate 20 is disposed between the right outer leg portion 6 -1 and the winding 7 -1 (see FIG. 3), and a receiving plate 20 is also disposed between the left outer leg portion 6 -5 and the winding 7 -3 (not shown). Here, FIGS. 4(a) and (b) show a plan view and a perspective view seen from the right side of the receiving plate 20. Since the receiving plates 20 have the same form on the sides with the left and right outer leg portions 6 -1 and 6 -5 and are arranged symmetrically with respect to the left and right of the transformer body 3, the configuration related to the right receiving plate 20 shown in FIG. 3 and the like will be mainly described.

[0025] As shown in FIGS. 3, 4(a) and (b), the receiving plate 20 is the outer leg portion 6 -1and winding 7 -1 The main surface portion 23 is located between the two, and the outer leg portions 6 are located at both ends in the front-rear direction, which is the width direction of the main surface portion 23. -1 It has a pair of lateral bent portions 21 and 22 formed by bending to the right so as to sandwich the other, and its cross-section is U-shaped (see Figure 6).

[0026] Furthermore, the receiving plate 20 has a pair of inwardly bent portions 24 and 25 that are bent inward (to the left in Figures 4(a) and 4(b)) at both of its main surface portions 23, and its longitudinal cross-section is U-shaped. In this case, the receiving plate 20 is made of a relatively thin steel plate with a thickness of, for example, about 5 mm or 6 mm, and the winding wire 7 -1 It is formed to be longer in the vertical direction than the standard. In addition, the receiving plate 20 of this embodiment is formed by bending a pair of inward bent portions 24, 25, a pair of lateral bent portions 21, 22, and a main surface portion 23 from a single steel plate.

[0027] The receiving plate 20 has an inwardly bent portion 24 at its upper end, which is wound with winding 7 -1 Top surface and iron core 5 -1 Insert it into the gap between the top and bottom (see Figure 3), and wind the inward bent portion 25 of the lower end with the winding 7 -1 Bottom surface and iron core 5 -1 The winding 7 is positioned to be inserted into the gap between the lower part and the lower part. -1 The main surface portion 23 is positioned so as to be aligned with the right side. In this case, the inward bent portions 24 and 25 are configured to reinforce the entire receiving plate 20 by being the portion where the upper and lower ends of the main surface portion 23 are bent at a right angle as described above, and the winding 7 -1 Even if a short-circuit mechanical force is applied, the structure is designed to suppress deformation such as the main surface portion 23 bending upwards or the lateral bent portions 21 and 22 expanding into a "V" shape, as shown by the dashed line C2 in Figure 4(a).

[0028] Furthermore, as shown in Figure 6, in the receiving plate 20, the lateral bent portions 21 and 22 have windings 7 on the main surface portion 23. -1 When a short-circuit mechanical force acts from this point, it is transmitted to the lateral support member 11 (see arrow A1). In this case, the tips of the lateral bent portions 21 and 22 have an edge shape or a chamfered shape that abuts against the main surface portion 11a of the lateral support member 11. Also, as shown in Figure 4(a), the bent length L from the base end to the tip of the lateral bent portions 21 and 22 is the outer leg portion 6 -1 The length is set to be approximately 5 mm longer than the width dimension (dimension in the left-right direction), and is the same as the protruding length of the reinforcing rib 11h of the right lateral support member 11.

[0029] Furthermore, as shown in Figure 4(b), the lateral bent portions 21 and 22 of the receiving plate 20 are housed within the lateral support member 11, overlapping the inside of the bent portions 11b and 11c of the lateral support member 11 with the same bend length L from the upper end to the lower end of the main surface portion 23 (see Figure 6). Therefore, deformation of the receiving plate 20, as shown by the dashed line in Figure 4(a), is also suppressed by the lateral support member 11. Furthermore, in the transformer body 3 described above, when the support members 11 to 14 are combined with each other, as shown in Figure 3, the insulating member 30 can also be housed within the lateral support members 11 and 12 in addition to the receiving plate 20. For the sake of explanation, the insulating member 30 is not shown in Figure 6, but the insulating member 30 will be described later (in Figure 7).

[0030] Next, the operation of the above configuration will be explained. In the oil-filled transformer 1 described above, when a short-circuit mechanical force occurs in the winding 7, the winding 7b attempts to deform radially outward (to the right in the figure) as indicated by the arrow at the outer winding 7b in Figure 6. In this case, unlike in this embodiment, if we assume that there is no support plate 20, the winding 7 in the figure will deform radially outward (to the right in the figure). -1 The short-circuit mechanical force of the outer leg portion 6 -1 This directly compresses the outer leg portion 6, worsening iron loss. -1 The amorphous iron core that makes up the device has low iron loss under no load, which is useful for improving the efficiency of static electromagnetic equipment. However, when stress is applied, iron loss increases, and there are also problems from the standpoint of brittleness, etc.

[0031] In this embodiment, when a short-circuit mechanical force occurs in the winding 7, the bending length L is set so that it is received by the main surface portion 23 of the receiving plate 20 and the external force is transmitted to the left and right lateral support members 11 and 12 through a pair of lateral bending portions 21 and 22, and the outer leg portion 6 -1 ,6 -5 The structure employs a design that suppresses the deformation of coil 7 without applying stress to it.

[0032] That is, as shown in Figure 6, the winding 7 is attached to the main surface portion 23 of the receiving plate 20. -1 When an external force is applied, the external force received by the lateral support member 11 is distributed through the pair of lateral bent portions 21, 22 and the reinforcing rib 11h (see the three arrows A1 in the figure). At this time, the lateral support member 11 is not only reinforced by its own reinforcing rib 11h, but also suppresses the deformation of the support plate 20 by supporting the center of the main surface portion 23, and also suppresses the deformation of the support plate 20 by clamping (sandwiching) the lateral bent portions 21, 22 with the overlapping bent portions 11b, 11c. For this reason, even if the thickness of the support plate 20 is reduced, deformation and displacement as shown by the dashed line C2 in Figure 4(a) are suppressed as much as possible, and the support plate 20 and outer leg portion 6 in Figure 6 -1 This makes it possible to create a configuration that minimizes the gap S2 between the two.

[0033] Moreover, the inwardly bent portions 24 and 25 that reinforce the support plate 20 itself are located on the central side, as shown in Figure 4, and can ensure the required strength without being bulky on the sides. In this way, the configuration of the support plate 20 and the lateral support member 11 together can be made suitable for suppressing lateral deformation of the winding 7, and the outer leg portion 6 -1 ,6 -5 This prevents short-circuit mechanical forces from being transmitted, and also contributes to making the transformer body 3 and, consequently, the tank 2 smaller and lighter.

[0034] As described above, the bending length L of the receiving plate 20 in this embodiment is set so that when an external force is applied to its main surface portion 23 from the winding 7, the external force is transmitted to the lateral support members 11 and 12 through a pair of lateral bending portions 21 and 22. According to this, the receiving plate 20 has a relatively simple structure with a U-shaped cross-section, but the pair of lateral bent portions 21 and 22 transmit external force to the lateral support members 11 and 12, and the outer leg portion 6 -1 ,6 -5 This allows us to prevent stress from being applied to it.

[0035] The receiving plate 20 is formed to be longer in the vertical direction than the winding 7, and has a pair of inwardly bent portions 24, 25 bent inward at both ends in the vertical direction, and the pair of inwardly bent portions 24, 25, a pair of lateral bent portions 21, 22, and the main surface portion 23 are formed from a single steel plate. According to this design, the pair of inwardly bent portions 24 and 25 can be constructed in a relatively inexpensive and simple manner while ensuring the strength of the support plate 20 without adding bulk to the sides. In addition, the thickness of the support plate 20 can be made relatively thin, making it possible to make the transformer body 3 smaller and lighter.

[0036] The lateral support members 11 and 12 are provided with reinforcing ribs 11h that are located inward and extend in the vertical direction. According to this, the reinforcement of the lateral support members 11 and 12 can suppress deformation when a short-circuit mechanical force occurs in the winding 7. Furthermore, for example, by bringing the reinforcing rib 11h into contact with the main surface portion 23 of the receiving plate 20, as shown in Figure 6, deformation of both the lateral support members 11 and 12 and the main surface portion 23 can be suppressed.

[0037] The lateral support members 11 and 12 have a pair of overlapping bent portions 11b and 11c that sandwich a pair of lateral bent portions 21 and 22 at both ends in the width direction and bend inward so as to overlap with the lateral bent portions 21 and 22. According to this, the pair of overlapping bent portions 11b and 11c suppress the deformation of the receiving plate 20 (lateral bent portions 21 and 22) as shown by the dashed line in Figure 4(a), and the outer leg portion 6 -1 ,6 -5 The gap S2 can be maintained so that no stress is applied to the outer leg portion 6 -1 ,6 -5 This can be a suitable form for protecting [the subject]. The configuration of the lateral support members 11, 12 and the receiving plate 20 described above is useful from the standpoint of preventing deterioration of iron loss due to compression and brittleness, especially since the iron core 5 is a three-phase five-legged iron core and in particular uses an amorphous iron core.

[0038] <Second Embodiment> Figure 7 shows a diagram corresponding to Figure 6 according to the second embodiment. In the transformer body 3 of this second embodiment, the lateral support members 11, 12 and the outer leg portion 6 -1 ,6 -5 An insulating member 30 is placed between the receiving plate 20 and the outer leg portion 6 -1 ,6 -5 This differs from the first embodiment in that an insulating member 31 is placed between the two. It is.

[0039] The insulating material 30 is made of, for example, pressboard (cardboard) that has electrical insulating properties and mechanical strength, and consists of two layers of 0.8 mm thick material. Furthermore, as shown in Figure 7, the insulating members 30 are a pair, front and back, with an "L" shaped cross-section, and their vertical height is set to be equal to or greater than the height of the support plate 20 (see Figure 3). Thus, on the side of the lateral support member 11 shown in Figure 7, one insulating member 30 and the other insulating member 30 are separated front and back by reinforcing ribs 11h, and the main surface portion 11a and the outer leg portion 6 of the lateral support member 11 are separated. -1 It is clamped in an L-shape between the right side and the overlapping bent portions 11b, 11c and the lateral bent portions 21, 22.

[0040] This configuration of insulating member 30 prevents the formation of an electrical circuit (an electrical circuit formed by the structure) by the combination of the lateral support member 11 and the receiving plate 20, which are made of steel plates. Therefore, the inner end portion 30a of the insulating member 30 (left end portion in Figure 7, see Figure 3) is sized to extend inward more than the flange portions 11f and 11g of the lateral support member 11 (left end portion in Figure 7). The insulating member 30 comes into contact with the tips of the lateral bent portions 21 and 22, and to suppress damage, the tips are chamfered as described above.

[0041] On the other hand, the insulating member 31 shown in Figure 7 is similar to the insulating member 30 described above, for example, made by stacking two press boards with a thickness of 0.8 mm. Furthermore, the insulating member 31 is in the shape of a rectangular thin plate overall, and is formed to be slightly smaller than the main surface portion 23 of the receiving plate 20. In this case, the insulating member 31 is connected to the receiving plate 20 and the outer leg portion 6 -1 The reinforcing rib 11h' is positioned using the gap S2 between it and the main surface 23, and is set to a protruding length that contacts the main surface 23 via the insulating member 31. Therefore, the tip side of the reinforcing rib 11h' is chamfered, or the two layers of insulating member 31 are used to prevent the tip side of the reinforcing rib 11h' from penetrating through.

[0042] As explained in the first embodiment, the receiving plate 20 has a predetermined strength that makes it difficult to deform. However, even if deformation occurs in the main surface portion 23 of Figure 7, such as bending 3 mm to the side, the outer leg portion 6 is still able to withstand the deformation because the gap S2 is set to, for example, 5 mm. -1 It is designed so that no external force acts upon it. Furthermore, the insulating members 30 and 31 described above only need to be arranged to prevent the formation of an electrical circuit by the structure between the lateral support members 11 and 12 and the receiving plate 20, and one of the insulating members 31 may be omitted.

[0043] As described above, in this second embodiment, the lateral support members 11, 12 and the outer leg portion 6 -1 ,6 -5 Between the two, or between the receiving plate 20 and the outer leg portion 6 -1 ,6 -5 An insulating member 30 or 31 is interposed between the structure to prevent the formation of an electrical circuit. According to this, even if the pair of lateral bent portions 21 and 22 of the receiving plate 20 are in contact with the lateral support members 11 and 12, the insulating member 30 or 31 can prevent the formation of an electrical circuit by the structure. Furthermore, as described above, the support plate 20 and the lateral support members 11 and 12 have a predetermined strength, so the lateral support members 11 and 12 and the outer leg portion 6 -1 ,6 -5 Between the two, or between the receiving plate 20 and the outer leg portion 6 -1 ,6 -5 The gap between them can be reduced, and even if insulating members 30 or 31 are interposed using these gaps, the transformer body 3 can be made smaller and lighter.

[0044] The embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0045] In the drawing, 1 is the oil-filled transformer, 2 is the tank, 3 is the transformer body, 4 is the insulating oil, 5,5 -1 ~5 -4 The core is iron, 6,6 -1 ~6 -5 is the leg (6 -1 ,6 -5 (Outer leg), 7,7 -1 ~7 -3 10 is the winding, 10 is the support member frame, 11 is the right lateral support member, 11b and 11c are the overlapping bent sections, 11h and 11h' are the reinforcing ribs, 12 is the left lateral support member, 13 is the upper support member, 14 is the lower support member, 20 is the receiving plate, 21 and 22 are the lateral bent sections, 23 is the main surface section, 24 and 25 are the inward bent sections, and 30 and 31 are the insulating members.

Claims

1. An oil-filled transformer comprising a transformer body having multiple iron cores and multiple windings wound around the legs of these iron cores, housed in a tank and filled with insulating oil, The transformer body is, A frame-like support member skeleton surrounding the plurality of iron cores, comprising an upper support member and a lower support member positioned above and below the plurality of iron cores, and left and right lateral support members positioned on the left and right sides to connect the ends of the upper and lower support members, the support member skeleton holding the plurality of iron cores, A support plate is positioned between the outer legs on both sides of the plurality of iron core legs that do not have the winding wound around them and the winding, The receiving plate comprises a main surface portion located between the outer leg portion and the winding, and a pair of lateral bent portions formed by bending the main surface portion laterally at both widthwise ends so as to sandwich the outer leg portion, and having a U-shaped cross-section. An oil-filled transformer in which the bending length is set such that when an external force acts on the main surface from the winding, the external force is transmitted to the lateral support member through the pair of lateral bending portions.

2. The oil-filled transformer according to claim 1, wherein the receiving plate is formed to be longer in the vertical direction than the winding, and has a pair of inwardly bent portions bent inward at both ends in the vertical direction, and the pair of inwardly bent portions, the pair of lateral bent portions, and the main surface portion are formed from a single steel plate.

3. The oil-immersed transformer according to claim 1, wherein an insulating member is interposed between the lateral support member and the outer leg portion, or between the receiving plate and the outer leg portion, to prevent the formation of an electrical circuit by these structures.

4. The oil-filled transformer according to claim 1, wherein the lateral support member is provided with reinforcing ribs positioned inward and extending in the vertical direction.

5. The oil-filled transformer according to claim 1, wherein the lateral support member has a pair of overlapping bent portions that sandwich the pair of lateral bent portions at both ends in the width direction and bend inward so as to overlap with the lateral bent portions.

6. The oil-immersed transformer according to any one of claims 1 to 5, wherein the plurality of iron cores are three-phase five-legged iron cores.

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