JP2022024385A - Transformer case - Google Patents

Abstract

To provide a transformer case structure that can promote weight reduction while ensuring mechanical strength.SOLUTION: A transformer case has an octagonal shape consisting of two long sides 1a, 1b and six short sides 1c to 1h. The thickness of the six short sides is made thinner than the thickness of the two long sides. In addition, a vertical reinforcement member 7 and a horizontal reinforcement member are attached to an outer surface of the transformer case with a long side as one side. Support reinforcing members are attached between the vertical reinforcing member 7 and the horizontal reinforcing member and a protruding portion 13 to which a primary bushing unit is attached via a mounting end face 12.SELECTED DRAWING: Figure 3

Description

The present invention relates to a technique for reinforcing and reducing the weight of a transformer case.

The case of the transformer has a polygonal shape, and the cross-sectional shape is generally a rectangular parallelepiped shape. (See Patent Document 1 below).

As mentioned above, the reason why the cross-sectional shape is octagonal is that it can be reduced by the amount of the corners compared to a general transformer having a rectangular parallelepiped shape, and the weight is reduced along with the reduction. Is.

Further, when the transformer case is an oil-filled transformer case, there is an advantage that the amount of insulating oil to be filled inside can be reduced by reducing the size of the transformer case.

Patent No. 4374264

As mentioned above, the weight of the transformer can be reduced by making the case octagonal, but further weight reduction is expected.

On the other hand, if the mechanical strength originally required is not guaranteed by reducing the weight, it will be overturned, and in order to reduce the weight, the necessary and sufficient mechanical strength must be guaranteed.

Therefore, the present invention provides a structure of a transformer case capable of promoting weight reduction while ensuring mechanical strength.

The invention according to claim 1 has an octagonal cross-sectional shape consisting of two long sides and six short sides, and the plate thickness of the six short sides is made thinner than the plate thickness of the two long sides. It is particularly characteristic.

According to the second aspect of the present invention, a vertical reinforcing member and a horizontal reinforcing member are attached to the outer surface of the case having the long side as one side according to the first aspect, and the vertical and horizontal reinforcing members and the protruding portion of the transformer case are provided. It is characterized in that it is configured by providing a support and reinforcement member between them.

The invention according to claim 3 is characterized in that a reinforcing member is installed on the inner surface of the transformer case.

According to the first aspect of the present invention, the weight of the transformer case can be reduced while maintaining the required mechanical strength.

According to the second aspect of the present invention, it is possible to increase the strength of the case around the protruding portion.

According to the third aspect of the present invention, the mechanical strength of the case can be further improved by attaching the reinforcing member to the inner side surface of the case.

It is a top view which shows the transformer to which the transformer case of this invention is applied. It is a front view of the transformer to which the transformer case of this invention is applied. It is a top view of the transformer case of this invention. It is a front view of the transformer case of this invention. It is an enlarged plan view of the main part which shows the lateral support reinforcement member attached to the transformer case of this invention. It is an enlarged side view of the main part which shows the vertical support reinforcement member attached to the transformer case of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a plan view showing a transformer A adopting the transformer case 1 according to the present invention, and FIG. 2 is a front view of the transformer A.

The transformer case 1 houses a transformer main body composed of an iron core and windings (not shown), and the transformer main body is immersed in insulating oil filled in the transformer case 1.

Reference numeral 2 is a conservator attached to the upper part of the transformer case 1 to absorb expansion and contraction of oil due to temperature change. Reference numeral 3 is a primary bushing as an input terminal of the transformer A, and 4 is a secondary bushing as an output terminal of the transformer A.

Reference numeral 5 is a radiator for cooling the insulating oil in the transformer case 1, and the insulating oil circulates by natural convection inside the transformer case 1 and the inside of the radiator 5.

Reference numeral 6 is a pressure release device for preventing the pressure inside the transformer case 1 from rising, and by releasing a pressure exceeding the specified value to the outside due to an internal short circuit accident of the transformer A or the like, deformation and destruction of the transformer case 1 can be avoided. ..

Reference numeral 7 is a vertical reinforcing member attached to the outer surface of the transformer case 1, and reference numeral 8 is a horizontal reinforcing member, which increases the rigidity of the transformer case 1 and improves its mechanical strength. When the vertical reinforcing member 7 extends to the lower end of the transformer case 1, a mounting seat (base) (not shown) is provided at the lower end of the case 1 and the lower end of the vertical reinforcing member 7 is attached to the base. It is possible to improve the rigidity by fixing it.

Reference numeral 9 is a first bushing pocket located on the upper part of the transformer case 1 to which the secondary bushing 4 is attached. Reference numeral 10 is a second bushing pocket attached to the outer surface of the transformer case 1 to which the primary bushing 3 is attached, and the second bushing pocket 10 forms the primary bushing unit 11 together with the primary bushing 3.

Schematic The shape of the transformer case 1 in the transformer A according to the present invention configured as described above is shown in FIGS. 3 and 4. In addition, in FIGS. 3 and 4, drawing is simplified or omitted for a portion that is not related to the characteristic portion so that the characteristic portion of the present invention can be easily understood.

FIG. 3 is a plan view of the transformer case 1, and FIG. 4 is a front view of the transformer case 1. The transformer case 1 of the present invention is composed of two long sides 1a and 1b facing each other and six short sides 1c to 1h connecting the two long sides 1a and 1b, and has an octagonal cross-sectional shape. ..

Since the first bushing pocket 9 having a substantially rectangular shape is located above the short sides 1c to 1e on the right side of FIG. 3, the cross-sectional shape of the transformer case 1 on the right side of FIGS. 3 and 4 is The upper part has a rectangular shape, and the lower part is a part of an octagonal shape composed of three short sides 1c to 1e.

On the front side 1x of the outer surface of the transformer case 1, a mounting end surface 12 for mounting the bushing unit 11 shown in FIGS. 1 and 2 is provided integrally with the protrusion 13 and continuously with the transformer case 1. By fixing the bushing unit 11 to the mounting end surface 12, the opening 14 formed in the outer surface 1x of the transformer case 1 is closed.

As shown in FIG. 3, H steel is used for the vertical reinforcing member 7 attached to the outer surface 1x, 1y (front side is 1x, back side is 1y) of the transformer case 1 shown in FIGS. 3 and 4. Channel steel is used for the lateral reinforcing member 8. The channel steel is attached to the outer surface 1x of the transformer case 1 so that the groove faces downward.

The lateral reinforcing member 8 is attached to the lower side of the mounting end surface 12. As shown in FIG. 4, the vertical reinforcing members 7 are arranged at positions from the lower part to the upper part of the transformer case 1, and as an exception, the two central members are the horizontal reinforcements from the lower part of the transformer case 1. It is arranged at a position leading to the member 8.

As described above, the reason for adopting H steel for the vertical reinforcing member 7 is that the cross-sectional performance can be improved. Another advantage is that it is inexpensive.

In FIG. 3, 15 and 16 are oil conduits for connecting the radiator 5 shown in FIG. 1, and 17 shows a pressure release tube for connecting the pressure release device 6 shown in FIG.

Next, a characteristic part of the present invention will be described. In the transformer case 1 of the present invention, the plate thickness of the six short sides 1c to 1h is formed thinner than the plate thickness of the two long sides 1a and 1b in order to reduce the weight.

Here, the reason why the plate thickness of the two long sides 1a and 1b is not thinned is that the outer surfaces 1x and 1y of the transformer case 1 having the two long sides 1a and 1b as the upper sides have a large area. This is because if the plate thickness is reduced, the required mechanical strength may be impaired.

On the other hand, since the outer surface of the transformer case 1 having the six short sides 1c to 1h as the upper side has a small area, the required mechanical strength can be ensured even if the plate thickness is reduced. Therefore, in the present invention, only the outer surface of the transformer case 1 having the six short sides 1c to 1h as the upper side is thinned to reduce the weight.

Next, in FIG. 4, 18 shows a horizontal support reinforcing member mounted between the protrusion 13 integrated with the mounting end surface 12 to which the bushing unit 11 shown in FIGS. 1 and 2 is mounted and the vertical reinforcing member 7. As shown in FIG. 4, it is fixed to the left and right positions of the protruding portion 13.

Specifically, as shown in FIG. 5, each side surface of the support reinforcing member 18 is provided on the side surface of the groove portion and the protruding portion 13 of the vertical reinforcing member 7 made of H steel and the outer surface 1x on the front side of the transformer case 1. It is attached by fixing by welding or the like.

Reference numeral 19 denotes a vertical support reinforcing member attached between the overhanging surface portion 20 at the upper end of the transformer case 1 and the projecting portion 13, or between the lateral reinforcing member 8 and the projecting portion 13, and as shown in FIG. , Is fixed at the vertical position of the protruding portion 13.

Specifically, as shown in FIG. 6, each side surface of the support reinforcing member 19 is formed on the side surface of the groove portion and the protruding portion 13 of the lateral reinforcing member 8 made of channel steel and the outer surface 1x on the front side of the transformer case 1. Is attached by fixing by welding or the like.

In this way, as shown in FIG. 4, the projecting portion 13 is supported by the lateral support reinforcing member 18 and the vertical support reinforcing member 19 from all sides, so that the case strength around the projecting portion 13 can be increased.

As for the number of vertical and horizontal support / reinforcing members 19 and 18 that support the protrusions 13, in FIG. 4, three horizontal support / reinforcement members 18 are provided at the left and right positions of the protrusions 13, and the vertical support / reinforcement members 19 are provided. Although the case where three of the protrusions 13 are fixed at the upper and lower positions is shown in the figure, the number of the protrusions 13 can be appropriately changed depending on the strength of the case around the protrusions 13.

Next, a method for further improving the mechanical strength of the transformer case 1 will be described. In FIG. 3, reference numeral 21 denotes an in-case reinforcing member attached to the back surface of the outer surface 1x of the transformer case 1 in the transformer case 1, and together with the vertical and horizontal reinforcing members 7 and 8 shown in FIG. 4, the transformer. Increase the rigidity of Case 1 and reinforce it.

This is because, as shown in FIG. 4, if the lower end portion of the vertical reinforcing member 7 is not extended to the lower end portion of the case 1 without providing the mounting seat (base) on the outer surface of the case 1, the mounting seat (base) is used. Since the rigidity is inferior to the case where the base) is provided and the lower end portion of the vertical reinforcing member 7 is fixed to the base, the vertical reinforcing member 21 is also attached to the inner side surface of the case to compensate for the decrease in the rigidity. It can be used.

In addition, in FIG. 4, the case where the reinforcing member 21 in the case is installed on the back surface of the outer surface 1x of the transformer case 1 is illustrated. It is natural that you should do it.

As described above, in the transformer case of the present invention, the cross-sectional shape is formed into an octagon, and the thickness of the six short sides forming the octagon is compared with the thickness of the two long sides. By forming it thinly, it is possible to reduce the weight while ensuring the mechanical strength.

Further, by mounting a plurality of support and reinforcing members between the protruding portion of the transformer case to which the bushing unit is mounted via the mounting end surface and the vertical and horizontal reinforcing members, it is possible to increase the strength of the case around the protruding portion.

Further, by providing a reinforcing member in the transformer case, the mechanical strength of the transformer case can be further improved.

It can be applied to various cases where weight reduction is required while maintaining mechanical strength.

1 Transformer case 1a, 1b Long side 1c ~ 1h Short side 1x, 1y Outer side surface 2 Conservator 3 Primary bushing 4 Secondary bushing 5 Radiator 6 Pressure release device 7 Vertical reinforcing member 8 Horizontal reinforcing member 9,10 bushing Pocket 11 Primary bushing unit 12 Mounting end surface 13 Protruding part 14 Opening part 15, 16 Oil conduit 17 Pressure release pipe 18 Horizontal support reinforcing member 19 Vertical support reinforcing member 20 Overhanging surface part 21 In-case reinforcement member A Transformer

Claims (3)

A transformer case having an octagonal cross-sectional shape consisting of two long sides and six short sides, and characterized in that the thickness of the six short sides is thinner than the thickness of the two long sides. A vertical reinforcing member and a horizontal reinforcing member are attached to the outer surface of the case having the long side as one side, and a support reinforcing member is provided between the vertical and horizontal reinforcing members and the protruding portion of the transformer case. The transformer case according to claim 1. The transformer case according to claim 1 or 2, wherein a reinforcing member is attached to the inner surface of the case.

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