JPH0419771Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a mounting structure for a bushing of a soundproof transformer covered with a soundproof wall, and in particular, the invention relates to a mounting structure for a bushing of a soundproof transformer covered with a soundproof wall. Regarding the mounting structure.

(Prior art and problems) In a medium capacity transformer with a capacity of 10MVA to 30MVA covered with a soundproof wall, when the primary insulation class is No. 60 or 70 and the secondary insulation class is No. 20 or 30. Because the difference in height between the primary and secondary bushings is small, it is difficult to install bushings on the top surface of the transformer tank (hereinafter referred to as the tank) while ensuring an insulating distance. In order to do this, it was necessary to increase the planar dimensions of the upper part of the tank, which resulted in a larger soundproof wall covering the tank, which had the disadvantage of increasing its external dimensions.

That is, FIGS. 1 and 2 are a plan view and a front view of a conventional soundproof transformer, in which the primary bushing 3 is placed in the primary (high voltage side) butting pocket 2 on the top surface of the tank 1, and the secondary (low voltage side) button single pocket 4
A secondary bushing 5 is provided in each of the primary bushing pockets 2, and each of the primary bushing pockets 2 communicates with a communication pipe 6, and the communication pipe 6 communicates with a radiator 7. The secondary bushing pockets 4 each communicate with a connecting pipe 8, which in turn communicates with a radiator 9. Since the difference between the height of the secondary bushing 5 and the height of the primary bushing 3 is small,
In the plane space of tank 1, secondary bushing 5
Primary bushing 3 by ensuring insulation distance A for
Therefore, it is impossible to provide the secondary bushing 5 at a position away from the primary bushing 4 so that an expansion part 10 is provided in the tank 1 to ensure an insulation distance A to the secondary bushing 5. are placed. A soundproof wall 11 is provided around the tank 1. In Fig. 1, the connection between the primary bushing pocket 2 and the communication pipe 6 is the U phase and the W phase, and the connection between the secondary bushing pocket 4 and the communication pipe 8 is the U phase and W phase. The connection locations (number of phases) are determined by the amount, and are not limited to two locations.

In such a conventional soundproof transformer, (a) an extension part 10 is required in the tank 1 in order to secure the insulation distance A between the primary bushing 3 and the secondary bushing 5, making the shape of the tank complicated; Costs will increase.

(b) The size of the tank increases by the amount of the expanded portion, and the size of the soundproof wall 11 increases.

(c) As the soundproof wall 11 becomes larger, the external dimensions become larger.

(d) Therefore, the overall weight becomes large, the installation area becomes large, and the amount of insulating oil becomes large, making it uneconomical.

There were many shortcomings.

(Purpose of the invention) The present invention was made in order to solve the drawbacks of the soundproof transformer of the conventional structure described above, and its purpose is to provide a soundproof transformer with small external dimensions and weight, and a small amount of insulating oil. purpose.

(Summary of the invention) This invention installs a common bushing pocket of the secondary bushing diagonally upward on the side of the tank, connects this secondary common bushing pocket and the tank with a connecting pipe, and connects this connecting pipe with the primary bushing. The structure ensures an insulating distance between the soundproof transformer and the bushing, and the overall dimensions (outside dimensions) of the soundproof transformer are made smaller.

(Embodiments of the invention) Hereinafter, embodiments of the invention will be described based on the drawings. 3 and 4 are a plan view and a front view showing an embodiment of the present invention, and the same parts as in FIGS. 1 and 2 are given the same reference numerals. In FIGS. 3 and 4, 13 is a secondary common bushing pocket that collects all phases (including the neutral point), and the secondary side radiator 9
It is provided diagonally above the tank 12 (that is, on the upper outer side of the tank 12 away from the primary bushing 3). By arranging the secondary common bushing pocket 13 in this way, the secondary common bushing pocket 13 can be placed in the primary bushing 3.
It can be provided with the required insulation distance between the two.

In addition, 14 is a secondary common butching pocket 13
It is a connecting pipe that connects the primary bushing 3 and the tank 12, and has an inclined part that is inclined in a direction away from the primary bushing 3. The connecting pipe 14 can secure a required insulation distance from the primary bushing 3 due to this inclined portion.

Therefore, as described above, the secondary common bushing pocket 13 is provided with a required insulation distance from the primary bushing 3, and the connection pipe is provided with the required insulation distance from the primary bushing 3 due to the inclined portion. By configuring the secondary common bushing pocket 13 and the tank 12 to be connected by 14, it is possible to obtain a soundproof transformer that can secure the required insulation distance without providing an extension part.

Note that the connecting pipe 14 can be connected to the tank 12 at the end of the upper surface of the tank 12 away from the primary side, and at a position on the center line of the two adjacent phases on the primary side. The distance from the primary bushing 3 (distance that contributes to the insulation distance) can be secured most efficiently within the limited space of. In other words, when arranging the primary and secondary phases facing each other at the top of the tank, the arrangement that ensures the longest insulation distance between each phase is to alternate the primary and secondary phases. It is to arrange them in a staggered manner.

If connecting pipes are provided for each phase on the secondary side, if you try to arrange each phase on the primary side and each phase on the secondary side alternately, the intermediate between the u phase and v phase on the primary side It is possible to arrange the two phases of the secondary side, u phase and v phase, or v phase and w phase, at alternate positions opposite to the position and the intermediate position between the v phase and the w phase. At this time, either one of the W-phase or U-phase is placed outside of the three phases on the primary side, and in order to secure space for placing this one phase, the tank There will be a need to expand the space at the top.

However, according to the present application, since the connecting pipe 14 is provided and the lead wires of each phase on the secondary side are collectively stored in the connecting pipe 14, the lead wires of the secondary side phases are By arranging the connecting pipes 14 on the secondary side to face each other at some position, as a result, all the phases on the secondary side are arranged to face each phase on the primary side at alternate positions. Since a similar state can be obtained, it is possible to most efficiently ensure the insulation distance without expanding the space above the tank 12.

Furthermore, since the lead wires for each phase on the secondary side are collectively stored in the connecting pipe 14 as described above, the secondary bushing pocket connected to the connecting pipe 12 is common to each phase on the secondary side. It is necessary to arrange the bushings of each phase separately from the secondary bushing pocket 13. In FIG. 3, it is between the v-phase and the w-phase, but it may be between the u-phase and the v-phase. Lead wires (not shown) for all phases (including the neutral point) on the secondary side run through the inside of the connecting pipe 14 .
When there is no height restriction on the transformer or when a duct is installed, the secondary bushing 5 is installed horizontally as shown in Figures 3 and 4; however, when there is no height restriction, the secondary bushing 5 is installed horizontally. may be mounted vertically above the secondary bushing pocket 13. 15 is a soundproof wall.

(Effects of the invention) As explained above, the soundproof transformer of the invention has
A secondary common bushing pocket that is common to the secondary bushings is placed on the upper and outer side of the tank that is separated from the primary bushing to ensure an insulating distance from the primary bushing, and the secondary common bushing pocket and the tank are separated from the primary bushing. (a) The tank 12 is connected to the primary bushing through a connecting pipe having an inclined part that is inclined in the direction of the transformer. This eliminates the need for a tank extension to provide a bushing pocket, unlike conventional soundproof transformers.

(b) Since the tank extension part is no longer needed, tank 1
2 may have a simple shape, the tank size may be small, and a small amount of insulating oil may be required.

(c) Therefore, the dimensions of the soundproof wall become smaller, and the overall dimensions (external dimensions) of the soundproof transformer become smaller.

(d) The overall weight is reduced, the installation area is smaller, and the amount of insulating oil is also reduced.

You can get great effects such as

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view showing the structure of a conventional soundproof transformer, and FIGS. 3 and 4 are a plan view and a side view showing the structure of a soundproof transformer according to the present invention. 2 is a primary bushing pocket, 3 is a primary bushing, 5 is a secondary bushing, 9 is a secondary side heatsink,
12 is a tank, 13 is a secondary common bushing pocket, 14 is a connecting pipe, and 15 is a soundproof wall.

Claims (1)

[Scope of Claim for Utility Model Registration] A soundproof transformer in which a transformer tank containing the contents of the transformer is covered by a soundproof wall and primary and secondary bushings are led outside the soundproof wall, wherein: A primary bushing is installed in the primary bushing pocket, and a secondary bushing pocket common to each phase on the secondary side is placed in an upper outer part of the transformer tank that is separated from the primary bushing. The secondary bushing pocket is connected to the secondary bushing pocket via a connecting pipe having an inclined portion that slopes away from the primary bushing, so that the connecting pipe and the secondary bushing pocket maintain an insulating distance from the primary bushing. A soundproof transformer characterized in that secondary bushings for each phase are installed in the common secondary bushing pocket, and lead wires for each phase on the secondary side are collectively housed in the connection pipe.