JP6351460B2 - Oil-filled transformer - Google Patents

Description

  The present invention relates to an oil-filled transformer in which a transformer body is accommodated in a tank together with insulating oil.

  The oil-filled transformer has a plurality of legs arranged in one direction and is wound around each of the iron cores arranged with the longitudinal direction of each leg facing up and down, and the plurality of legs of the iron core. A transformer body provided with a plurality of windings, and a tank containing the transformer body together with insulating oil. When the transformer is operated, the winding generates heat due to the copper loss determined by the current flowing through the winding and the resistance of the winding, and the iron core generates heat due to the iron loss generated in the iron core, so that the temperature of the transformer body rises. Therefore, in an oil-filled transformer, the temperature of the transformer is obtained by absorbing the temperature of the transformer body in the insulating oil accommodated in the tank and allowing heat exchange between the insulating oil and the outside air through the tank. Is prevented from rising excessively. In order to increase the heat radiation area of the tank and efficiently dissipate heat from the tank to the outside, the tank side wall may be corrugated or a heat radiator may be attached to the tank.

  In the oil-filled transformer, when the temperature of the transformer main body rises, the insulating oil in contact with the transformer main body is heated and expands, and its specific gravity decreases. Therefore, an oil flow rising along the transformer body is generated in the tank. The insulating oil in contact with the tank is cooled and contracted by exchanging heat with the outside air through the tank, and its specific gravity increases. Therefore, an oil flow descending along the inner surface of the tank is generated in the tank. Therefore, the convection that rises along the transformer body and then descends along the inner surface of the tank is generated in the insulating oil in the tank, and the heat generated from the transformer body is continuously carried by the convection of the insulating oil. As a result, the transformer body is cooled.

  In the oil-filled transformer disclosed in Patent Document 1, an insulating cylinder formed so as to surround the transformer main body is disposed between the transformer main body and the tank, and the insulating oil rises by the cylinder. By dividing the flow and the downward flow, the convection of the insulating oil is performed smoothly, and the cooling efficiency is increased. Further, in Patent Document 1, a radiator is attached to the side wall of the tank, and a linear or spiral guide plate is attached to the outer periphery of the cylindrical body, and this guide plate causes the downward flow of insulating oil to the radiator side. Proposals have been made to increase the cooling effect by guiding.

JP 2013-161836 A

  In a transformer in which the transformer body is housed in the tank together with insulating oil, the size of the tank is the minimum necessary to ensure the insulation strength of the transformer body to ground in order to prevent the transformer from becoming large. Set to size. Therefore, the distance between the both ends in the longitudinal direction of the transformer body and the tank is set to the minimum necessary size, and the space formed between the both ends in the longitudinal direction of the transformer body and the tank is the transformer. It is significantly narrower than the space formed between both ends in the width direction of the main body and the tank. Therefore, the convection of the insulating oil is suppressed and heat tends to stay in the space between the longitudinal ends of the transformer body and the tank. If heat accumulates in the insulating oil at the sides of the transformer body in the longitudinal direction, the windings placed at both ends of the transformer body cannot be cooled well, so the parts of the transformer body are cooled evenly. It was difficult to do.

  As shown in Patent Document 1, if a cylindrical body made of an insulating material is arranged between the transformer body and the tank so as to promote convection of the insulating oil, the cooling of each part of the transformer body is uniform. However, in this case, it is necessary to expand the space between the tank and the transformer body in order to arrange the cylinder, so that the tank becomes large. Problems arise.

  In addition, as shown in Patent Document 1, when a cylinder made of an insulator is disposed between the transformer main body and the tank, in addition to the means for fixing the transformer main body to the tank, the cylinder Since it is necessary to provide means for positioning and holding the body, there arises a problem that the structure of the tank is complicated.

  Furthermore, as shown in Patent Document 1, in the case where a cylindrical body made of an insulator is arranged between the transformer body and the tank, the convection of the insulating oil is smoothly performed in the tank. It is preferable to provide a continuous gap along the circumferential direction of the cylinder between the lower end of the cylinder and the bottom wall of the tank. For this purpose, the entire lower end of the cylinder is connected to the bottom wall of the tank. Since it is necessary to hold the cylindrical body in the tank in a state of floating from the top, there arises a problem that the structure of the transformer becomes complicated. Further, as disclosed in Patent Document 1, a plurality of notches for allowing the insulating oil to pass therethrough are provided at the lower end of the cylinder, and the lower end of the cylinder is supported in a state of being in contact with the bottom wall portion of the tank. However, in such a case, when the insulating oil flowing from the upper part to the lower part in the tank moves to the inside of the cylindrical body, the portion through which the insulating oil can pass is limited to the notched part. Therefore, it may be difficult to smoothly perform the convection of the insulating oil.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an oil-filled transformer capable of uniformly cooling each part of a transformer main body without causing an increase in size of a tank or complicating a structure. It is in.

  The present invention has a plurality of leg portions arranged along one direction, and an iron core disposed with the longitudinal direction of each leg portion directed in the vertical direction, and a plurality of windings respectively wound around the plurality of leg portions of the iron core. An oil-filled transformer including a transformer main body provided with a winding and a tank containing the transformer main body together with insulating oil is intended. In the transformer targeted by the present invention, between the longitudinal end of the transformer body along the juxtaposed direction of the plurality of windings and the tank and between the longitudinal other end of the transformer body and the tank, respectively. The formed first and second space in the tank is between the one end in the width direction that is perpendicular to the longitudinal direction of the transformer body and the tank, and the other end in the width direction of the transformer body and the tank. It is narrower than the third and fourth tank spaces formed between each of the two.

  In the present invention, the outer peripheral surface of the winding disposed at one end in the longitudinal direction of the transformer body and the second winding of the winding disposed at the other end in the longitudinal direction of the transformer body. A plurality of insulating guide plates extending in a direction inclined with respect to the axial direction of each winding are fixed to the outer peripheral surface facing the space in the tank in a state of being arranged in the axial direction of each winding.

  If comprised as mentioned above, the upward flow of the insulation oil which arises in the space in the 1st and 2nd tank when insulation oil is heated with a coil | wind will be bent by a guide plate, and will become 1st and 2nd tank It flows out from the inner space to the third tank inner space or the fourth tank inner space. Therefore, in the tank, in addition to the convection mainly rising the third and fourth tank spaces along the transformer main body and then descending along the inner surface of the tank (this convection is called primary convection). Then, after flowing through the space between the guide plates arranged in the first and second tank spaces and flowing obliquely into the third tank space or the fourth tank space, the third tank space Alternatively, convection descending along the inner surface of the tank in the fourth tank space (this convection is referred to as secondary convection) can be generated.

  Thus, if primary convection and secondary convection are generated in the tank, primary convection is unlikely to occur due to the short distance between the winding and the tank. An oil flow is always generated that replaces the insulating oil present in the lateral first and second tank spaces with the lower temperature insulating oil present in the third tank space or the fourth tank space. Therefore, even when the distance between both ends in the longitudinal direction of the transformer body and the tank is short and it is difficult to cause primary convection sufficiently in the first and second tank spaces, the first and second Heat can be prevented from staying in the second tank space, and each part of the transformer body can be uniformly cooled.

  Moreover, if comprised as mentioned above, even if it does not attach a guide board to the inner surface of the tank which faces the space in the 3rd tank, and the inner surface of the tank which faces the space in the 4th tank, it becomes the space in the 1st and 2nd tank Since the secondary convection can be generated to replace the existing insulating oil with the insulating oil having a low temperature existing in the lower space of the third tank space or the fourth tank space, the third space in the tank In the fourth tank space, the transformer body can be cooled by positively generating primary convection without being obstructed by the guide plate. Therefore, if comprised as mentioned above, a primary convection and a secondary convection will be produced with sufficient balance in a tank, and an oil-filled transformer with high cooling capacity can be obtained.

  Further, as described above, when the guide plate that generates the secondary convection is fixed to the outer periphery of the winding, it is not necessary to provide a member for supporting the guide plate, so that the structure of the transformer is complicated. Therefore, a transformer having a high cooling capacity can be obtained.

  Moreover, since it is not necessary to produce primary convection positively at both ends in the longitudinal direction of the transformer body when configured as described above, even if the space between the both ends in the longitudinal direction of the transformer body and the tank is narrow, there is no problem. Moreover, since the guide plate is made of an insulating material, even if the guide plate is placed in a narrow space formed between the longitudinal ends of the transformer body and the tank, the insulation of the transformer is not threatened. . Therefore, when configured as described above, the distance between both ends in the longitudinal direction of the transformer body and the tank is set to a minimum size necessary for securing the dielectric strength between the ground, and the tank can be downsized. Can be achieved.

  In order to easily attach the guide plate, the guide plate is preferably fixed to the outer periphery of the winding by bonding.

  In one aspect of the present invention, at least one notch is formed in each of the plurality of guide plates. In this case, each notch formed in each guide plate is provided so as to be arranged at a position vertically aligned with one notch provided in another adjacent guide plate. At least one row of notches extending in the vertical direction is formed.

  As described above, if the notches aligned in the vertical direction are provided in the plurality of guide plates, the insulating oil can flow in the vertical direction through the notches. In the case where a space capable of generating primary convection of insulating oil can be ensured between the two, the primary convection can be promoted to increase the cooling capacity.

  According to the present invention, the outer peripheral surface of the winding disposed at one end in the longitudinal direction of the transformer body and the second winding of the winding disposed at the other end in the longitudinal direction of the transformer body. A plurality of insulative guide plates extending in a direction inclined with respect to the axial direction of each winding are fixed to the outer peripheral surface facing the inner space of the tank, so that the third and fourth inner spaces in the tank are mainly transformed. In addition to primary convection that descends along the inner surface of the tank after rising along the vessel body, the first and second space in the tank rises along a direction inclined with respect to the axial direction of the winding. After entering into the third tank space or the fourth tank space obliquely, secondary convection that descends along the inner surface of the tank is generated in the third tank space or the fourth tank space. Because you can Insulating oil present in the first and second tank spaces on both sides of the transformer body in the longitudinal direction is easily insulated with the low temperature existing in the third tank space or the fourth tank. An oil flow that replaces the oil can always be generated. Therefore, heat can be prevented from staying in the first and second tank spaces, and the entire transformer body can be cooled uniformly.

  Further, according to the present invention, since the guide plate is fixed to the outer periphery of the winding, secondary convection can be generated without specially providing a member for supporting the guide plate. A transformer having a high cooling capacity can be obtained without complicating the structure.

  In addition, since the guide plate is made of an insulator, the guide plate is placed in a narrow space at both ends in the longitudinal direction of the transformer without threatening the insulation of the transformer, and without reducing the insulation performance of the transformer. A transformer with high cooling capacity can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the 1st Embodiment of this invention is shown schematically, (A) is a top view in the state which removed the cover of the tank of the transformer which concerns on this embodiment, (B) is (A). The longitudinal cross-sectional view which showed the transformer main body by cross-sectioning the tank along the BB line, and (C) is the vertical cross-section showing the transformer main body by cutting the tank along the CC line of (A) FIG. It is the perspective view which showed roughly the iron core and coil | winding which comprise the transformer main body used by this embodiment. It is the perspective view which showed an example of the guide plate used by this embodiment. The structure of the 2nd Embodiment of this invention is shown roughly, (A) is a top view in the state which removed the cover of the tank of the transformer which concerns on this embodiment, (B) is (A). The longitudinal cross-sectional view which showed the transformer main body by cross-sectioning the tank along the BB line, and (C) is the vertical cross-section showing the transformer main body by cutting the tank along the CC line of (A) FIG.

  FIGS. 1A to 1C show the configuration of the first embodiment of the present invention. In these figures, 1 is a transformer body, and 2 is a tank in which the transformer body 1 is accommodated together with insulating oil 3. It is. A transformer main body 1 used in a transformer targeted by the present invention includes an iron core having a plurality of legs arranged in one direction and the longitudinal direction of each leg being arranged in the vertical direction, and the iron core. And a plurality of windings respectively wound around the plurality of legs.

  In this embodiment, as shown in FIG. 2, it has two leg parts 4a and 4b extended in parallel with each other, and upper and lower yoke parts 4c and 4d that connect between the upper and lower ends of these leg parts. A wound iron core 4 having a substantially rectangular or oval contour is used, and windings 5a and 5b are wound around legs 4a and 4b of the iron core 4, respectively. Each of the windings 5a and 5b includes a first winding and a second winding wound around the first winding, and the first windings of the windings 5a and 5b. The low voltage winding and the high voltage winding are configured by connecting the wires and the second windings in series or in parallel.

  The upper and lower yoke portions 4c and 4d of the iron core 4 are respectively inserted inside the box-shaped upper core fastener 6 and lower core fastener 7, and a pair of iron core fastening bands (the lower ends of which are fixed to the lower core fastener 7) (Not shown) is arranged along the outer periphery of the iron core 4, and both the fastening bands are fixed to the upper core fastener 6 with the iron core 4 being fastened, whereby the iron core 4 is fixed to the core fastener 6. And 7 are fixed. Although not shown, the windings 5a and 5b are positioned and held between the upper core fastener 6 and the upper ends of the windings 5a and 5b and between the lower core fastener 7 and the lower ends of the windings 5a and 5b, respectively. A coil base is inserted for this purpose.

  In this specification, among the parts of the transformer main body 1 including the iron core 4 and the windings 5a and 5b, the direction extending in the direction in which the windings 5a and 5b are juxtaposed (the left-right direction in FIG. 1A) is transformed. The longitudinal direction of the transformer body is defined as a direction perpendicular to the longitudinal direction (vertical direction in FIG. 1A). It is assumed that the transformer targeted by the present invention is an inner iron type, and windings are arranged at both ends in the longitudinal direction of the transformer body.

  The tank 2 used in the present embodiment is formed of a metal such as iron and has a cylindrical side wall 2a and a bottom wall 2b that closes an opening on the lower end side of the side wall 2a. An annular pedestal 2c is welded to the lower surface of the wall 2b. An opening 2d that opens upward is formed at the upper end of the side wall 2a of the tank 2, and a lid 2e (see FIG. 1B) is attached so as to close the opening.

  The transformer body 1 is inserted into the tank through the opening 2d of the tank 2, and its lower end is positioned by a positioning fitting 2f attached to the bottom wall 2b of the tank 2.

  A high voltage bushing terminal 9 is attached to the core clamp 6 on the upper part of the transformer body 1 via a mounting bracket 8 and a low voltage bushing terminal 11 is attached via a mounting bracket 10. The lead wire drawn out from the wire and the low voltage winding is connected to the high voltage bushing terminal 9 and the low voltage bushing terminal 11. The high voltage bushing terminal 9 and the low voltage bushing terminal 11 are led out to the outside in a state of penetrating the side wall of the tank 2 in a liquid-tight manner.

  In a state where the transformer main body 1 is accommodated in the tank 2, between the tank 2 and one end in the longitudinal direction of the transformer main body 1 along the parallel direction of the windings 5 a and 5 b (between the winding 5 a and the tank 2). ) And the other end in the longitudinal direction of the transformer main body 1 and the tank 2 (between the winding 5b and the tank 2), a first tank space S1 and a second tank space S2 are formed, respectively. A third tank space S3 and a fourth tank space S4 are provided between one end in the width direction of the transformer body 1 and the tank 2 and between the other end in the width direction of the transformer body 1 and the tank 2, respectively. It is formed. In the present embodiment, since the tank 2 is formed in a cylindrical shape, the first tank space S1 and the second tank space S2 are more than the third tank space S3 and the fourth tank space S4. It is narrower.

  In the oil-filled transformer configured as in the present embodiment, the first tank space S1 and the second tank space S2 are very narrow. It is difficult to sufficiently generate the primary convection of the insulating oil that rises along the transformer main body and then descends along the inner surface of the tank. Therefore, the insulating oil that has absorbed heat from the windings 5a and 5b in the first tank space S1 and the second tank space S2 and the insulating oil having a lower temperature in the tank are smoothly replaced. It is difficult, and heat tends to stay in the first and second tank spaces S1 and S2. When such a state occurs, there is a possibility that the windings 5a and 5b on both ends in the longitudinal direction of the transformer body 1 cannot be sufficiently cooled.

  Therefore, in the present embodiment, the winding 5a disposed at one end in the longitudinal direction of the transformer body 1 and the winding disposed at the other end in the longitudinal direction of the transformer body and the outer peripheral surface facing the first space S1 in the tank. A plurality of insulating properties extending in a direction inclined with respect to the axial direction of each winding in a state of projecting toward the tank side from the outer periphery of each winding on the outer peripheral surface of the wire 5b facing the second tank space S2 Are fixed in a state where they are arranged in the axial direction of the respective windings.

  A series of guide plates 20, 20,... Fixed to the outer peripheral surface of the winding 5a disposed at one end in the longitudinal direction of the transformer body 1 and facing the first tank space S1, and the other end in the longitudinal direction of the transformer body. A series of guide plates 20, 20,... Fixed to the outer peripheral surface of the winding 5 b disposed in the second tank space S 2 with respect to the axis of the windings 5 a and 5 b (in the vertical direction). It is preferable to provide in the state inclined to the same side. In the present embodiment, each guide plate 20 fixed to the outer periphery of the winding 5a has an end portion located on the third in-tank space S3 side than an end portion located on the fourth in-tank space S4 side. Is also inclined to be arranged at a lower position. Further, as shown in FIG. 1C, each guide plate 20 fixed to the outer periphery of the winding 5b has an end located on the fourth tank space S4 side in the third tank. It is inclined so as to be arranged at a position lower than the end located on the space S3 side.

  Each guide plate 20 is formed in the shape of a band plate, and is fixed to the outer periphery of the winding by adhesion while being obliquely attached to the outer periphery of the winding 5a, 5b. In the present embodiment, as shown in FIG. 3, a strip-shaped guide plate 20 that is curved so as to extend along the outer periphery of the winding is used. In the case where a thin guide plate 20 is used, in order to facilitate adhesion of the guide plate 20, a minimum paste margin 20a is provided at one end in the width direction of the guide plate 20 in contact with the outer periphery of the winding. It is preferable to leave.

  Note that the guide plate 20 is not limited to the shape shown in FIG. 3, and a gap is formed between the guide plate 20 and the outer peripheral surface of the winding in an inclined state with respect to the axial direction of the winding. It does not have to be (in close contact with the outer periphery of the winding), as long as it has a shape that is arranged in conformity with the outer periphery of the winding.

  Examples of the material constituting the guide plate 20 include a plate made of an insulating resin that does not deteriorate even when immersed in insulating oil for a long period of time, and craft paper that has a proven record as an insulating material used in an oil-filled transformer. Is preferred. Since the outer periphery of the winding is usually covered with an insulating material such as kraft paper, the guide plate can be easily adhered to the outer periphery of the winding.

  Like the present embodiment, the winding 5a arranged at one end in the longitudinal direction of the transformer body 1 is arranged at the outer peripheral surface facing the first tank space S1 and at the other end in the longitudinal direction of the transformer body. A plurality of insulating guide plates 20, 20,... Inclined to the same side with respect to the axial direction of the respective windings are fixed to the outer peripheral surface of the winding 5b facing the second tank space S2. And the insulating oil 3 is heated by the windings 5a and 5b, and the upward flow of the insulating oil generated in the first and second tank spaces S1 and S2 is bent by the guide plates 20 and 20, And it is made to flow diagonally from the second tank space to the third tank space S3 side or the fourth tank space S4 side. In the third tank space S3 and the fourth tank space S4, an oil flow that rises from the lower part of the tank along the transformer body 1 and then descends from the upper part of the tank along the inner surface of the tank ( Primary convection) occurs actively.

  Therefore, in the tank 2, primary convection mainly descending along the inner surface of the tank after raising the third and fourth tank spaces S3 and S4 along the transformer body, and the first and second After the tank spaces S1 and S2 rise along the direction inclined with respect to the axial direction of the winding and flow into the third tank space or the fourth tank space obliquely, the third tank space Alternatively, secondary convection descends along the inner surface of the tank in the fourth tank space.

  In the present embodiment, the guide plates 20, 20,... Fixed to the outer periphery facing the first tank space S1 on the outer periphery of the winding 5a have end portions positioned on the third guide space S3 side. 4 is inclined so as to be disposed at a position lower than the end portion located on the guide space S4 side, and therefore flows obliquely into the first tank space S1 from the lower part of the third tank space S3. Then, after escaping to the upper part of the fourth tank space S4, secondary convection descends along the inner surface of the tank in the fourth tank space S4.

  Further, the guide plates 20, 20,... Fixed to the outer periphery facing the second tank space S2 on the outer periphery of the winding 5b have their end portions located on the fourth guide space S4 side having third guides. Since it is inclined so as to be arranged at a position lower than the end located on the space S3 side, it flows obliquely into the second tank space S2 from the lower part of the fourth tank space S3, After escaping toward the upper part of the third tank space S3, secondary convection descends along the inner surface of the tank in the third tank space S3.

  As described above, when primary convection and secondary convection are generated in the tank, heat tends to stay and the first tank space S1 and the first tank space S1 on the sides of the both ends in the longitudinal direction of the transformer main body are easily stored. Oil that replaces the insulating oil existing in each of the two tank spaces with the low-temperature insulating oil that exists in the lower part of the third tank space and the low-temperature insulating oil that exists in the lower part of the fourth tank space. Since a flow can always be generated, it is possible to prevent heat from being trapped in the narrow space in the first and second tanks and cool each part of the transformer body evenly.

  In addition, you may make the inclination direction of the guide plate fixed to the outer periphery of winding 5a and 5b differ from said embodiment. That is, in the inclination direction of each guide plate 20 fixed to the outer periphery of the winding 5a, the end portion located on the fourth tank space S4 side is more than the end portion located on the third tank space S3 side. The direction in which the guide plate 20 is fixed to the outer periphery of the winding 5b is inclined to be arranged at a low position. It is good also as the direction inclined so that it may be arrange | positioned in the position lower than the edge part located in the space S4 side in a tank.

  When the inclined plate is provided in this way, it flows obliquely into the first tank space S1 from the lower part of the fourth tank space S4 and comes out closer to the upper part of the third tank space S3. Thereafter, secondary convection descending along the inner surface of the tank in the third tank space S3, and obliquely flowing into the second tank space S2 from the lower part of the third tank space S3, After escaping toward the upper part of the fourth tank space S4, secondary convection descends along the inner surface of the tank in the fourth tank space S4.

  If the distance between both ends of the transformer body 1 in the longitudinal direction and the tank 2 can be set relatively large (when the tank size can be given a margin), the transformer body 1 The primary convection of the insulating oil is also generated on both sides in the longitudinal direction, and the cooling of the transformer body can be promoted by both the cooling action by the primary convection and the replacement action of the insulating oil by the secondary convection. it can.

  FIG. 4 shows a second embodiment of the present invention. In this embodiment, the outer periphery of the winding 5a disposed at one end in the longitudinal direction of the transformer body 1 faces the first tank space S1. At least one of each of the guide plates 20, 20,... Attached to the outer peripheral surface facing the second tank space S2 of the winding 5b disposed at the other end in the longitudinal direction of the surface and the transformer body. A notch 20b is formed. Each notch 20b formed in each guide plate 20 is provided so as to be arranged at a position vertically aligned with one notch 20b provided in another adjacent guide plate. At least one row of notches 20b extending in the vertical direction is formed on the plurality of guide plates 20, 20,. In this embodiment, two rows of notches 20b extending in the vertical direction are formed on a plurality of guide plates 20, 20,... Attached to the outer periphery of each winding. Other points are the same as those of the embodiment shown in FIG.

  As in the present embodiment, when the notches 20b, 20b,... Arranged in rows in the vertical direction are formed on the plurality of guide plates 20, 20,. 20b, 20b,... Can generate a vertical oil flow through the interior of the transformer body, thereby promoting the primary convection of the insulating oil in the first tank space S1 and the second tank space S2, and The cooling effect can be enhanced.

  Like each said embodiment, it has arrange | positioned at the outer peripheral surface which faces the 1st tank space S1 of the coil | winding 5a arrange | positioned at the longitudinal direction one end of a transformer main body, and the other end of the longitudinal direction of a transformer main body. If the guide plate 20 is attached to the outer peripheral surface of the winding 5b facing the second space S2 in the tank, when the transformer body 1 is inserted into the tank 2, the contact between the guide plate 20 and the tank 2 Since the range of the swing of the transformer body can be limited and the position of the transformer body can be regulated to some extent, the operation of inserting the transformer body into the tank can be easily performed.

  In each of the above embodiments, a single-phase transformer is taken as an example, but the present invention is also applied to an inner iron type three-phase transformer in which a three-phase winding is wound around three legs of an iron core. Of course you can.

  In each of the above embodiments, the radiator is not provided on the side wall of the tank 2, but the radiator is attached to the side wall of the tank, or the side wall of the tank is corrugated, inside the corrugated portion. The present invention can also be applied when an oil passage is formed.

DESCRIPTION OF SYMBOLS 1 Transformer body 2 Tank 3 Insulating oil 4 Iron core 4a, 4b Iron core leg 5a, 5b Winding 20 Guide plate 20a Adhesive margin 20b Notch S1 First tank space S2 Second tank space S3 Third Space in tank S4 Fourth space in tank

Claims (3)

An iron core having a plurality of legs arranged along one direction and having the longitudinal direction of each leg arranged in the vertical direction, and a plurality of windings respectively wound around the plurality of legs of the iron core A transformer body, and a tank containing the transformer body together with insulating oil, between one end of the transformer body in the longitudinal direction along the parallel direction of the plurality of windings and the tank; A width direction in which the first and second tank spaces formed between the other end in the longitudinal direction of the transformer body and the tank are perpendicular to the longitudinal direction of the transformer body. In the oil-filled transformer that is narrower than the third and fourth tank spaces formed between one end of the transformer and the tank and between the other end in the width direction of the transformer body and the tank, respectively. ,
The outer peripheral surface of the winding disposed at one end in the longitudinal direction of the transformer body and the second tank of the winding disposed at the other end in the longitudinal direction of the transformer body A plurality of insulating guide plates extending in a direction inclined with respect to the axial direction of each winding are fixed to the outer peripheral surface facing the inner space in a state of being arranged in the axial direction of each winding,
Oil-filled transformer characterized by.   The oil-filled transformer according to claim 1, wherein the guide plate is fixed to the outer periphery of the winding by adhesion. At least one notch is formed in each of the plurality of guide plates;
Each notch formed in each guide plate is provided so as to be arranged at a position vertically aligned with one notch provided in another adjacent guide plate, the plurality of guide plates, At least one row of notches extending in the vertical direction is formed,
The oil-filled transformer according to claim 1 or 2.

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