JP6200710B2 - Transformer - Google Patents

Description

  The present invention relates to a technique for improving the earthquake resistance of a transformer, particularly an oil-filled transformer.

  As a background art of the present invention, conventionally, in a large-capacity transformer, the thickness of the base member of the transformer to be installed and fixed on the floor is simply increased, or a rigid steel plate is used for the plate material. The strength of the vessel is improved. Further, as a technique for improving the earthquake resistance of the transformer, there are Patent Document 1 (Japanese Patent No. 4327521) and Patent Document 2 (Japanese Patent Laid-Open No. 2008-103578). In Patent Document 1, a triangular-shaped seismic reinforcing member is installed on both sides of the transformer main body separately from the transformer main body, and is connected and fixed to improve the earthquake resistance. Further, in Patent Document 2, in order to prevent the vibration of the transformer from being transmitted to the panel side, an upper fixing bracket is provided on the upper clamp, and an anti-vibration rubber is provided between this and a mounting seat on the panel frame side. It is described that the configuration is arranged and fixed.

Japanese Patent No. 4327521 JP 2008-103578 A

  The above-mentioned anti-vibration technology in Patent Document 1 is intended for large transformers such as transformers installed in power plants and the like, and since the transformer body cannot be earthquake resistant, a seismic reinforcement member is arranged separately from the transformer body. ing. Therefore, although the earthquake resistance has been improved, it is necessary to secure the installation area and reinforce the construction work, leading to an increase in cost. In addition, this method requires work dedicated to seismic design from the design stage, and it was difficult to perform additional work to reinforce the installed transformer. Moreover, the method using the vibration-proof rubber of patent document 2 has the possibility that the vibration-proof effect will fall, if the volume of a transformer becomes large. An object of the present invention is to provide a transformer that obtains a higher level of seismic resistance only by a transformer main body and is equipped with an additional reinforcing structure as a standard specification.

  In order to solve the above problems, for example, the configuration of the claims is adopted. The present invention includes a plurality of means for solving the above problems. To give an example, the present invention relates to a tank containing an iron core and a coil, corrugated fins arranged around the tank, In a transformer comprising a tank top plate at the top of the tank and a tank bottom plate at the bottom, the top plate, both side walls, and the bottom plate of the tank are wound with a band-shaped metal material reinforcing member so as to go around the tank, It is characterized in that a U-shaped anchor bolt base integrated with the reinforcing member is arranged on the side of the reinforcing member arranged and fixed on the bottom plate of the tank.

  According to the present invention, the seismic resistance of the transformer itself can be improved, and the ease of use is improved because the structure can be reinforced with earthquake resistance by additional work even after the transformer is installed.

The external appearance perspective view of the whole oil-filled transformer of Example 1 of the present invention is shown. AA sectional drawing in FIG. 1A is shown. The perspective view of the metal plate whose cross section of the reinforcement member for earthquake resistance is a rectangle is shown. The perspective view of the cylindrical member whose cross section of the reinforcement member for earthquake resistance is square and the inside is hollow is shown. The partial enlarged view of the base arrange | positioned at the tank lower part of the transformer of this invention is shown. The partial enlarged view of the base of Example 2 arrange | positioned under the tank of the transformer of this invention is shown. The external appearance perspective view of the whole oil-filled transformer of Example 3 of the present invention is shown. The front view of the oil-filled transformer of Example 3 is shown. The side view of the oil-filled transformer of Example 3 is shown. The top view of the oil-filled transformer of Example 3 is shown. The expansion perspective view of the base part of the lower part of the oil-filled transformer of Example 3 is shown. The top view of the bottom part of the oil-filled transformer of Example 3 is shown. The perspective view of the base part of the oil-filled transformer of Example 3 is shown. The perspective view of the stay of the oil-filled transformer of Example 3 is shown. The schematic diagram which shows the force which generate | occur | produces in the transformer at the time of an earthquake occurrence is shown. The top view of the bottom part of the oil-filled transformer of Example 4 is shown. The perspective view of the base part of the oil-filled transformer of Example 4 is shown.

  Hereinafter, embodiments of the oil-filled transformer of the present invention will be described with reference to the drawings.

Example 1
FIG. 1A is a perspective view showing an overall appearance of an oil-filled transformer having an earthquake resistant structure. In FIG. 1A, 10 is an oil-filled transformer, 20 is a tank, 23 is a corrugated fin for cooling, and 24 is a weld line welded to the upper and lower sides of the corrugated fin 23. Yes. 28 is a belt-like seismic reinforcing member that is wound around the entire depth of the tank 20 in the depth direction (Y-axis direction) and fixed by welding or the like. Here, a coordinate axis is provided, and the longitudinal direction of the transformer is defined as the X-axis direction, the depth direction is defined as the Y-axis direction, and the height direction is defined as the Z-axis direction. The oil-filled transformer 10 is assembled by winding a coil 2 around an iron core 1 made of silicon steel or amorphous ribbon, and the assembly of the iron core 1 and the coil 2 is stored in a tank 20 and filled with insulating oil 3 in the tank 20. In order to cool the heat generated from the iron core 1 and the coil 2, the corrugated fins 23 are formed around the tank 20, and the insulating oil 3 is circulated in the corrugated fins 23 for cooling. . In addition, as shown in FIG. 1A, the seismic reinforcing members 28 are arranged at two locations in the direction perpendicular to the X-axis direction (Y-axis direction) of the oil-filled transformer, but at least two locations are arranged. Well, increasing it has more earthquake resistance.

  Next, FIG. 1B shows a cross-sectional view taken along the line AA of the reinforcing member 28 shown in FIG. 1A. FIG. 1B is a cross-sectional view of the transformer in the portion of the reinforcing member 28 fixed around the tank 20. The tank 20 houses a coil core assembly in which the iron core 1 and the coil 2 are assembled, and the insulating oil 3 is supplied. Filled. The position of the oil surface of the insulating oil 3 is made higher than the position of the corrugated fins 23. Further, an enlarged cross-sectional view of the corner portion B of the tank 20 and the tank top plate 27 is shown in the B portion enlarged view. The upper part of the tank 20 is bent outward at the top end of the tank 20, and an airtight gasket 29 is arranged over the entire circumference between the tank 20 and the tank top plate 27 to maintain the airtightness in the tank. Yes. A cooling corrugated fin 23 is disposed around the tank 20.

  The seismic reinforcing member 28 wound around the entire circumference in the depth direction (Y-axis direction) of the tank 20 is wound around the top plate 27, both side walls, and the bottom plate of the tank, and the portion in contact with the tank 20 is welded. And the entire transformer is surrounded by a square frame of seismic reinforcement members to improve the rigidity of the entire tank.

  Further, as shown in FIG. 1A, the seismic reinforcing members 28 are arranged at two locations that are separated from the center of the transformer by a predetermined distance, and the corrugated fins are not arranged at the locations of the corrugated fins 23 on the outer wall surface of the tank 20. Then, the reinforcing member 28 is arranged on the tank side wall surface and fixed by welding or the like, and the reinforcing member 28 is continuously arranged on the bottom plate of the transformer from the side wall surface of the tank and fixed by welding or the like. Further, the portion where the tank top plate 27 and the tank 20 are in contact with each other is provided with the airtight gasket 29 on the entire circumference as described above, so that the reinforcing member 28 is bent and raised to surround this portion. Then, a continuous seismic reinforcing member 28 is fixed to the upper portion of the tank top plate 27 by welding or the like, and the circumference of the transformer is continuously fixed by the frame of the reinforcing member 28. In this way, by surrounding the tank 20 and the tank top plate 27 at a predetermined distance from the center, by winding and fixing with the earthquake-resistant reinforcing member 28 which is a rigid metal plate in the Y-axis direction, Improves the earthquake resistance of the transformer body.

  The seismic reinforcing member 28 uses a metal plate 281 having a rectangular cross section and thickness as shown in FIG. 1C, or a member of a cylindrical body 282 having a square cross section and a hollow center as shown in FIG. 1D. When is used, the strength increases. In addition, the quadrangular shape has a large lateral dimension and a small height dimension so that the volume of the reinforcing member does not increase. Although not shown, a cylindrical body having a triangular cross section and a hollow center can be used, or a semicircular cylindrical body can be used as a seismic reinforcing member. Moreover, the transformer which improved the intensity | strength can be provided even if it uses the steel material of U shape called L shape, L shape, and H shape. Further, although not shown in the figure, the entire transformer may be wound around and fixed to the X-axis direction perpendicular to the Y-axis direction, that is, the longitudinal direction of the transformer by using the earthquake-resistant reinforcing member 28. The entire transformer may be wound and fixed in the Y-axis direction.

  Next, the base of the transformer for fixing the transformer 10 shown in FIG. 1A to the floor will be described with reference to FIGS. 2A and 2B. 2A and 2B show enlarged views of the lower part of the transformer tank. In FIG. 2A, the seismic reinforcing member 28 is disposed on the side wall surface of the tank 20 where the corrugated fins 23 are not disposed, is continuously disposed by being bent at the bottom plate of the tank 20, and is fixed to the tank bottom plate by welding or the like. Further, a base 60 having an anchor bolt hole 61 on the lateral side of the seismic reinforcement member 28 is disposed on the bottom plate of the tank 20 and fixed to the bottom plate by welding or the like. The base 60 is U-shaped to increase the strength of the base.

  The length of the base 60 can be longer than the length of the bottom plate of the tank in the Y-axis direction, and may be a length up to the middle of the tank. The portion of the anchor bolt hole 61 protrudes from the tank bottom plate, What is necessary is just to be able to attach an anchor bolt. Further, the shape of the base is a U-shape in FIG. 2A, but it may be a rectangular tube shape or a triangular tube shape.

(Example 2)
Next, another embodiment of the base is shown in FIG. 2B and this configuration will be described. FIG. 2B is a perspective view showing the structure of the base of the second embodiment, in which the seismic reinforcing member 28 and the anchor bolt base 60 are integrated by welding or the like. The reinforcing member 28 is disposed on the side wall surface of the tank 20 where the corrugated fins 23 are not provided, is bent on the bottom plate of the tank 20 and is disposed on the bottom plate, and is fixed by welding or the like. In addition, the base 60 is formed of a metal plate having a U-shaped cross section, and the reinforcing member 28 is accommodated in the U-shaped groove, and the height of the U-shaped side is higher than that of the bottom plate portion. As shown in the figure, a notch is provided and placed in contact with the bottom of the tank, and fixed by welding or the like. An anchor bolt hole 61 is disposed outside the U-shaped base groove in the Y-axis direction. The length of the base 60 from the tank side wall surface is shorter than the height of the corrugated fins 23 so as to make the installation area of the transformer as small as possible.

  In addition, although the strength of the U-shaped metal material of the base 60 increases as the thickness increases, the thickness of the base 60 can be obtained from the weight of the transformer or external force. Although not shown, there is a configuration in which the seismic reinforcing member 28 is mounted on the two U-shaped sides of the base 60 and integrated. In this configuration, since a space is formed between the U-shaped base and the reinforcing member 28, a metal plate is applied and fixed so as to close the space so that water drops such as rain do not enter the base 60 from the outside. To.

(Example 3)
FIG. 3A is a perspective view showing the overall appearance of the oil-filled transformer having the seismic structure of the present invention. In FIG. 3A, the same names as those in FIG. Two stays are arranged in the X-axis direction of the vessel, and 32 is a stay arranged at the center.
Next, the third trigonometric method of the transformer of Example 3 will be described. 3B shows a front view of the oil-filled transformer of the present invention, FIG. 3C shows a side view, and FIG. 3D shows a top view. In FIG. 3B, corrugated fins 23 are arranged on both sides of the tank 20, 31 is a base installed and fixed on the bottom plate of the tank lower part 21, and 30 is a stay connected to the base 31. The base 31 and the stay 30 are arranged at equidistant positions on both sides from the center in the X axis direction of the transformer, where the longitudinal direction of the transformer is the X axis, the height direction is the Z axis, and the depth direction is the Y axis. . The structures of the base 31 and the stay 30 will be described later. A stay 32 is arranged in the center of the tank 20 from the lower tank portion 21 to the upper tank portion 22.

  Next, in the side view of the oil-filled transformer in FIG. 3C, the corrugated fins 23 are arranged before and after the tank 20, and the base 31 installed and fixed to the lower tank portion 21 is located below the corrugated fins 23 in the lower tank portion 21. The structure is continuous from the front side to the rear side. Further, an enlarged cross-sectional view of the G portion on the front surface of the base 31 is shown in the following figure. The lower part of the tank 20 has a convex shape on the lower side, and the front side of the lower part of the tank 21 has a stepped shape when viewed in cross section. The bent corner part of the base 31 is placed in contact with the stepped part and welded. Thus, the base 31 and the tank lower part 21 are fixed. This configuration is the same before and after. The stay 30 connected to the base 31 extends from the tank lower portion 21 to the tank upper portion 22 and extends in contact with the tank upper portion 22 and is fixed by welding or the like.

  Next, FIG. 3D shows a top view of the oil-filled transformer of the present invention. In FIG. 3D, corrugated fins 23 are arranged around the tank 20. The bases 31 are respectively arranged at locations separated from the center by a predetermined distance in the X-axis direction. The stay 32 disposed at the center in the X-axis direction is provided on the side wall surface of the tank 20. Further, both ends of the base 31 are configured so as not to protrude from the tips of the corrugated fins 23.

  Next, the configuration of the base 31 at the lower part of the transformer will be described with reference to FIG. 3E. FIG. 3E is an enlarged perspective view of a portion of the right base 31 on the lower side of the oil-filled transformer. In FIG. 3E, the structure of the base 31 has a U-shape in cross section, and this U-shape is arranged so as to abut on the bottom plate of the tank lower part in the Y-axis direction. The abutting part is fixed by welding or the like. In this U shape, the height of the side 311 in the inner Z-axis direction is increased, and the height in the outer Z-axis direction is decreased. In the U-shaped inner side 311 of the base 31, the shape is rectangular, the outer upper corner portion is cut and has an inclined portion, and the inner corner portion is a stepped step portion of the tank lower portion 21. Contact and fix by welding.

  Further, the stay 30 is formed in the Z-axis direction on the U-shaped outer side 312 of the base 31. The stay 30 is a rectangular metal plate having a predetermined width, and has a length from the tank lower portion 21 to the tank upper portion 22. The stay 30 is disposed between the corrugated fins 23 and abuts against the outer wall of the tank 20. Are arranged as follows. The stay 30 and the U-shaped base 31 may be formed by bending a metal plate, or may be formed by connecting the respective metal plates by welding or the like.

  Next, the bottom of the oil-filled transformer will be described with reference to FIG. 3F. 3F, FIG. 3F (a) is a plan view of the bottom of the transformer, FIG. 3F (b) is a CC cross-sectional view of the base portion, FIG. 3F (c) is a DD cross-sectional view of the base portion, and FIG. (D) shows EE sectional drawing of the center part of a base part. 3F (a), corrugated fins 23 are arranged around the tank 20, and two bases 31 are arranged at positions away from the center in the X-axis direction. Holes 313 are arranged at both ends of the base 31, and the holes 313 are anchor bolt holes for fixing the base 31 to the floor. Furthermore, in the U-shape of the base 31, the outer corner portion of the inner side 311 is cut and the inclined portion is provided in order to facilitate the work when the anchor bolt is attached.

Further, stays 32 are arranged above and below the center of the tank lower portion 21 in the Y-axis direction.
FIG. 3F (b) shows a CC cross-sectional view of the base portion 31 of FIG. 3F (a), and a trapezoidal side 311 for fixing the tank lower portion 21 to the both ends in the Y-axis direction by welding or the like. Is forming. The central portion of the base portion 31 is a portion that contacts the bottom plate of the tank lower portion 21 and is fixed by welding or the like. FIG. 3F (c) is a DD cross-sectional view of the base portion 31 of FIG. 3F (a), where the height of the U-shaped outer side 312 of the base portion 31 is t, and the trapezoidal side 311 of the facing surface is shown. When the height is T, the length (T−t) is the height of the tank lower portion 21. The strength increases as the U-shaped width M of the base portion 31 is increased rather than narrowed. FIG. 3F (d) shows a cross-sectional view of the vicinity of the center of the base portion 31 of FIG. 3F (a), where the U-shaped height t is equal, both sides are placed against the bottom plate of the tank 20, and welding is performed. To fix.

  Next, a perspective view of the structure of the base portion 31 is shown in FIG. 3G. In FIG. 3G, a trapezoidal side 311 to be fixed to the tank lower portion 21 is formed on one side of each end of the base portion 31 having a U-shaped cross section, and a stay 30 is connected to the other side 312 facing each other. ing. The stay 30 may be manufactured by being bent and integrally formed with the base portion 31, or may be manufactured separately by welding or the like.

  Next, FIG. 3H shows a perspective view of the stay 32 arranged at the center of the transformer. The stay 32 disposed in the center is formed of a long and narrow rectangular metal plate, and the width thereof is the same as the stay 30 disposed in the two base portions 31. The length of the stay 32 is the length from the tank lower part 21 to the tank upper part 22 of the transformer, and the stay 32 is brought into contact with the tank lower part 21 and the tank upper part 22 vertically and fixed by welding or the like.

Next, the force generated in the transformer when an earthquake or the like occurs will be described with reference to FIG. In FIG. 4, 40 is the center of gravity of the transformer, W _H horizontal force, W _V is vertical force, 41 is a base portion, 42 is an anchor bolt, 43 is a floor surface, and anchor bolt 42 is a floor surface. Embedded in 43. When an earthquake or the like occurs, the rotational force of the anchor bolt portion 42 generated by the horizontal force WH is proportional to the distance from the hole 313 that fixes the base to the center of gravity of the transformer, and the rotational force Ｗ _WH / There is a relationship of 0.5L. Here, L represents the distance between anchor bolts. Further, in the vertical direction, a reverse rotational force is generated, and similarly, the relationship of rotational force _Ｖ W _V / H is established. Here, H is the height from the floor of the transformer's chief 40.

  The difference between the rotational force in the vertical direction and the horizontal direction is applied to the anchor bolt 42. Therefore, in the horizontal direction, the longer the distance L between the anchor bolts 42, the smaller the rotational force and the more difficult it is to fall. In the vertical direction, the earthquake resistance is improved as the height H of the center of gravity is similarly reduced.

  In general, the dimensions of the tank 20 of the transformer 10 are long in the X-axis direction and short in the Y-axis direction in the case of three phases. This is because the coils housed in the tank 20 are arranged in the X-axis direction. With this configuration, the rotational force in the X-axis direction is small and the stability is high. To strengthen the earthquake resistance, the rotational force in the Y-axis direction and the strength against shear are secured while securing the strength against shearing in the X-axis direction. Strengthening is an important issue for preventing the transformer from falling and improving earthquake resistance.

Example 4
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 5A and 5B. FIG. 5A shows a plan view of the bottom of the oil-filled transformer according to the fourth embodiment of the present invention. In FIG. 5A, 21 indicates the bottom of the tank 20, 50 indicates an additional base, and 51 indicates a base slidably attached to the additional base 51. The base 50 is disposed at two positions at a predetermined distance from the center line and fixed by welding or the like. Moreover, the partial enlarged view of the edge part F part of the base 51 is shown in the following figure, and the perspective view of the part of F part is shown in FIG. 5B.

  In FIG. 5B, the structure of the additional base of the fourth embodiment is a cylindrical body having a square cross section, and is disposed on the tank bottom 21, and the portion to be fixed is U-shaped in cross section, and is rectangular outside the tank bottom 21. It has a cylindrical body. Then, a double-structured rectangular tubular body 51 is attached to the outside of the inner rectangular tubular body 50 so as to be slidable. Further, the slidable outer base 51 can slide and extend from the inner base 50 to improve the seismic resistance of the transformer, and can increase the interval between the positions where the anchor bolts are stopped. In the drawing, a plurality of attachment holes 53 and 54 for anchor bolts are arranged in an extendable base 51. Further, the mounting hole 52 of the inner base 50 is disposed at the same position as the hole 313 in FIG. 3F. Furthermore, the attachment holes 55 and 56 in FIG. 5B are attachment holes for connecting and fixing to the base 31 in FIG. 3F.

  In the above-mentioned additional base, since the configuration is a rectangular cylindrical body, the extending base is difficult to deform torsion, and can be prevented from rotational force. The dimension to be fixed can be increased, and the rigidity can be increased. Although the base shown in FIGS. 5A and 5B is described as an additional base, it may be used as the base shown in FIG.

10. Oil-filled transformer,
20 ... tank,
21 ... Bottom of tank,
22 ... top of tank,
23. Corrugated fin for cooling,
24. Welding wire,
30 ... Stay,
31 ... base
311 ... U-shaped inner side of the base 31,
312 .. U-shaped outer side of base 31 (trapezoidal shape),
40: Transformer center of gravity,
41. Base part,
42. Anchor bolt,
43 ... the floor,
50 ... Additional base,
51. Base attached to additional base 51

Claims (5)

A tank containing an iron core and a coil;
Corrugated fins arranged around the tank;
In a transformer comprising a tank top plate and a bottom plate at the top of the tank,
The base disposed on the bottom plate of the tank has a U-shaped cross section,
Both ends of the base protrude from the bottom plate of the tank, one side has a square shape, and the other side is connected to a tank reinforcing stay,
The bottom of the tank has a convex shape on the lower side,
The square side of the base is in contact with the convex part at the bottom of the tank,
The tank reinforcing stay arranged on the base is arranged and fixed up to the upper part of the tank along the side wall surface of the tank . The transformer according to claim 1, wherein
A transformer, wherein the base disposed on the bottom plate of the tank is welded and fixed at a location in contact with the tank . The transformer according to claim 1, wherein
The square side formed at both ends of the base cuts the outer upper corner portion and has an inclined portion . The transformer according to claim 1 , wherein
The base is provided with at least two places on the bottom plate of the tank . The transformer according to claim 1 , wherein
The tank reinforcing stay arranged on the base is a transformer having a rectangular metal plate having a long and narrow cross section, a cylindrical body having a square cross section, or a cylindrical body having a triangular cross section .

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