JPS6136692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer, and particularly to a split transformer in which a plurality of unit transformers are combined and wired in a predetermined manner at an installation site.

If a large-capacity transformer is required, and if it is not possible to install a single large-capacity transformer due to transportation constraints to the installation site, three or an integral multiple thereof may be used to meet the required capacity. Single-phase transformers with a capacity that is one-fold smaller than the number of transformers that can be transported are prepared, transported to the installation site, and assembled on-site to form a large-capacity transformer.

That is, for example, three unit transformers may be used and they are three-phase wired at the site to form a predetermined large-capacity three-phase transformer, or six unit transformers may be used and two
Measures have been taken, such as connecting a pair of parallel-connected unit transformers in each unit into a three-phase transformer to form a three-phase transformer with the required large capacity.

In the above-mentioned split transformer assembled on site, it is necessary to minimize the distance between each unit transformer in order to minimize the installation space.

FIG. 1 shows a conventional transformer 1 installed. The unit transformers 2A, 2B, 2C are tanks 7A, 7B, which are composed of upper half members 5A, 5B, 5C and lower half members 6A, 6B, 6C, which are fluid-tightly assembled by joint flanges 3A4A, 3B4B, 3C4B, respectively.
It has 7C. A transformer body having iron cores 8A, 8B, 8C and coils 9A, 9B, 9C wound around them is housed in the tanks 7A, 7B, 7C.

Each coil is connected in three phases in a duct 10 that connects the openings on the top surface of the tank, and their lead wires are connected to six bushings that pass through the top surface of the duct 10 (only one is shown as 11 in the figure for convenience of illustration). It is connected. Note that the duct and tank are filled with insulating oil.

In the above configuration, each tank has a partially cylindrical shape with a cylindrical curved surface spaced from the outer diameter of the winding by the minimum insulation distance in oil on the side wall corresponding to the front of the winding in order to save oil and make it more compact. In this case, since the width of the tank is the minimum possible size, the installation area can be reduced by arranging the unit transformers with their widths facing each other. Further, as shown in FIG. 2, the vertical reinforcing members 13 on both sides of the partial cylindrical shell 12 are attached to the flat surfaces 14 on both sides of the partial cylindrical shell, and their most protruding parts in the lateral direction are
Since the reinforcing member 13 of the adjacent tank is located inwardly from the most protruding part of the tank 2, the adjacent tanks are not hindered from being disposed close to each other.

However, the joint flanges 3A4A, 3B4B, 3
Since C4C is on the same level and these joint flanges intersect, this must determine the minimum distance between each unit transformer.

The present invention was made based on the above-mentioned circumstances, and an object of the present invention is to obtain a split type transformer whose installation area can be minimized.

In the present invention, the above object is achieved by ensuring that the joint flanges of tanks of adjacent unit transformers are not on the same level.

The details of the invention will be explained below with reference to the drawings. In FIG. 3, where the same parts as in FIG.
The joint flanges 3A4A and 3B4B of A and 7B are at different levels. Further, the joint flanges 3C and 4C of the tank 7C of the unit transformer 2C are on the same level as the joint flange of the tank of the unit transformer 2A.

In the split transformer according to the present invention having the above configuration, since the joint flanges of the tanks of adjacent unit transformers are not on the same level, there is no restriction on the distance between the transformers due to the distance between the joint flanges, and as shown in FIG. Since the distance between unit transformers can be made shorter than in the conventional split type transformer shown, the installation area can be minimized.

FIG. 4, in which the same parts as in FIGS. 1 and 3 are given the same reference numerals, shows another embodiment of the invention, in which the tanks 7A, 7B, 7C have partially cylindrical shells; It has a two-part configuration, which is inclined from one side to the other side opposite to it and cut by a plane perpendicular to the other side. Therefore, for example, in the tank 7A, the seam flange 3A
4A is located at a high position on one side surface having a partial cylindrical shell and is parallel to the tank bottom surface, and is located at a low position on the side surface opposite to said side surface and is also parallel to the tank bottom surface. Note that the other side surfaces are inclined with respect to the bottom surface of the tank.

Therefore, as shown in FIG. 4, each unit transformer 2A, 2B, 2C should be arranged so that the side surface having a high-positioned joint flange faces the side surface having a low-positioned flange of an adjacent tank. For example, there are no gaps between the joint flanges, and the installation area can be minimized.

In addition, according to this embodiment, there is no need to prepare two types of tanks with different joint flanges positions as in the embodiment shown in Fig. 2, and it is advantageous in terms of cost because only one type of tank is required. It is.

Furthermore, according to the present invention, the distance between the unit transformers can be minimized as described above, so the duct that connects the unit transformer tanks can also have the minimum dimensions, reducing the amount of oil filled in the duct. This makes it easier to transport the duct.

Furthermore, the present invention is not limited to what is described in the above embodiments. For example, it is also applicable to those using unit transformers having tanks other than the illustrated partial cylindrical shell type.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional split type transformer, Fig. 2 is an enlarged cross-sectional view of its main parts, Fig. 3 is a sectional view of one embodiment of the present invention, and Fig. 4 is another embodiment. FIG. 3 is an example cross-sectional view. 2A2B2C...Unit transformer, 3A4A, 3B
4B, 3C4C...joint flange, 5A5B5C
...Upper half member, 6A6B6C...Lower half member, 7A
7B7C...Tank.

Claims (1)

[Claims] 1 In the case where a plurality of unit transformers are arranged close to each other, the tanks of the unit transformers are connected by a duct, and each of the unit transformers is connected in a specified manner within the duct, the tank of each unit transformer is 1. A split type transformer characterized in that it has an at least two-part configuration in which adjacent ones have joint flanges at different levels.