JPS6012254Y2 - Transformer structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a large transformer that allows the contents of the transformer to be transported within a predetermined height while the transformer is assembled.

. Recently, transformers have been increasing in capacity due to economic efficiency, and most of them are shipped assembled in order to improve reliability and reduce man-hours.

In the case of land transportation, as is well known, the oil tank of the transformer itself is used as a strength member for transportation, and the hangings from the front and back are supported and transported by trusses.

Although this method is an excellent method that makes full use of the limited height for transportation, the current challenge in the industry is how to accommodate the large transformer contents within the limited height, and the limited capacity of assembled transportation is not reached. For nearby transformers, being able to make the contents larger, even by 10 mm, is a great benefit in terms of characteristics and insulation.

The present invention is proposed as one means for solving the above proposition.

Figures 1 and 2 are conventional structural diagrams of this type of transformer.
They are a front view and a side view, respectively.

A plurality of cross bars 3 are provided on the lower surface of the lower frame 2 consisting of left and right frames 2a and 2b provided on both sides of the lower yoke portion 1a of the iron core 1, extending over both the frames. The iron core 1 is mounted and supported via the insulating material 4.

A winding 5 is fitted into each core leg 1b, and the winding is connected to the lower frame 2 and the upper frame 6, which has the same structure as the lower frame provided at the upper yoke of the core, through an insulator (not shown). be supported and supported.

The crossbar 3 includes an iron core 1, a winding 5, and an upper and lower frame 6.
2, and prevents the lower surface of the core lower yoke portion 1a from coming into direct contact with other objects such as the bottom plate 7a of the oil tank 7.

The oil tank 7 is generally narrowed at the bottom to fit the railway transport limit, and a strong casing 8 is provided on the longitudinal side plate of the oil tank, which also serves as a reinforcement for the oil tank. Supported.

The oil tank bottom 7b must withstand the load due to the weight of the contents of the transformer applied during transportation via the crossbar.

The load includes an increase in load due to vibration during transportation.

The load acts as a concentrated load on a portion of each crossbar in the longitudinal direction of the oil tank, and as a distributed load in the direction perpendicular to the longitudinal direction.

Conventionally, the number of cross bars 3 used is about the same as the number of iron core legs, so the load borne by the cross bar 3 is large, and therefore the height hl of the bottom portion 7b that can withstand this load has become large.

Furthermore, when the contents of the transformer are lifted up using the hanging fittings 9 of the upper frame 6, the lower frame 2 is lifted up via the bolts 10, and at this time, most of the weight of the contents is absorbed by the crossbar 3.
, so its thickness h2 also increases.

Therefore, the larger the above h and h2, the lower the height of the transformer contents that can be transported.

The present invention has been developed in view of the above points, and its purpose is to accommodate as large a transformer contents as possible within an oil tank of limited height.

The purpose of this is to provide a plurality of recesses in the bottom of the oil tank, drop the crossbar into the recesses, and transfer the weight of the contents of the transformer to the crossbar.
This was achieved by transmitting the oil to the lower frame through the oil tank and supporting the frame at the bottom of the oil tank.

This will be explained below according to the drawings.

3 and 4 are a front view and a side view, respectively, of an embodiment according to the present invention.

The structure of the contents is the same as that shown in FIGS. 1 and 2 above.

The difference is that a recess 41 is provided at the bottom of the oil tank 40 at a portion corresponding to the plurality of cross bars 3, and the cross bar 3 is inserted leaving a gap between the bottom of the recess and the cross bar 3.

Therefore, the weight of the contents of the transformer is transmitted to the lower frame 2 via the crossbar, and the lower surface of the frame, except for the crossbar 3, touches the oil tank bottom plate 42 and includes the oil tank bottom 43.
Supported by

In the figure, the reason why there is a gap between the lower surface of the frame 2 and the oil tank bottom plate 42 is to make the relationship between the two clear.Actually, they contact each other as described above.

With the above configuration, the height of the contents of the transformer is reduced by the thickness h2 of the crossbar 3, in other words, the height of the contents is increased compared to the conventional one, and the transformer can be transported assembled. It becomes possible to increase the capacity of the transformer, and the degree of freedom in design increases.

In other words, the height dimension h1 as a structure for receiving the load inside the transformer, which was conventionally required directly under the crossbar 3, is no longer required, and as a result, the dimension from the bottom surface of the lower frame 2 to the Conventional h2+h shown in Figure 1
2, h2 + gap 10 tank wall plate thickness is sufficient.

In addition, in the past, there were few load points due to the crossbar, and the load was distributed at the load points with respect to the bottom plate of the oil tank as shown in Figure 5, and the load per unit area was large, but in the present invention, the load points are Distributed throughout the bottom plate of the oil tank,
Furthermore, as shown in FIG. 6, the load is close to the end fulcrum of the bottom plate 42 at the load point, and the load per unit area is small.

Therefore, the moment due to the load at the bottom of the oil tank is also small, and the height h3 of the bottom can be low.

Therefore, the height of the oil tank is also reduced accordingly.

With the above configuration, the lower surface of the iron core comes close to the oil tank bottom plate, but an insulator is interposed in this portion to prevent the two from coming into contact with each other due to dust or the like.

As is clear from the above explanation, a plurality of recesses are provided at the bottom of the oil tank, crossbars are inserted into the recesses leaving gaps between them and the bottom, and the contents of the transformer are inserted into the crossbars of the lower frame. By configuring it so that it is supported by contacting the bottom plate of the oil tank on the lower surface other than the crossbar, the height of the bottom of the oil tank can be reduced in addition to the thickness of the crossbar, and the height of the oil tank can be reduced by that amount. It can often reach 50 to 15 or Ia or more.

Furthermore, since the crossbar serves as a steady rest for the contents within the recess, there is an added advantage that there is no need to provide a special steady rest.

[Brief explanation of drawings]

1 and 2 are front and side views, respectively, of a conventional transformer, FIGS. 3 and 4 are front and side views of a transformer according to an embodiment of the present invention, and FIGS. 5 and 6 are FIG. 6 is an explanatory diagram showing how the load is applied to the bottom of the oil tank in the conventional oil tank and in the embodiment of the present invention, respectively. 1; Iron core, 1a: Lower yoke, 1b: Leg, 2゜2a, 2
b: lower frame, 3: crossbar, 5: winding, 6: upper frame, 40: oil tank, 41: recess, 42: oil tank bottom plate, 43: oil tank bottom.

Claims (1)

[Scope of utility model registration request] an iron core mounted and supported on a plurality of crossbars provided on the lower surface of lower frames provided on both sides of the lower yoke portion of the iron core, spanning the lower frames on both sides;
The contents of a transformer consisting of a winding inserted into the leg of the iron core and the winding supported between the lower frame and an upper frame provided on the upper yoke of the iron core are inside the oil tank. A recess is provided at the bottom of the oil tank at a location corresponding to the crossbar, and the crossbar is inserted into the recess with a gap left between it and the bottom, and the contents of the transformer are inserted into the recess. A structure of a transformer, characterized in that a lower surface of the lower frame other than a portion of the crossbar is supported by contacting the bottom plate of the oil tank.