JPS6135686B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a split type transformer that is constructed by installing a plurality of unit transformers, providing an oil duct on the side wall of the tank of each of these unit transformers, and making predetermined connections. .

Conventionally, when transporting large-capacity transformers to power plants located in the mountains or underground, there are often restrictions on transport dimensions and transport weight. In such cases, the transformer is divided into a plurality of units, and the contents of the transformer are transported fully assembled in the lower tank. In order to integrate these unit transformers on-site or to electrically and mechanically connect them to a load tap changer installed separately from the main unit, conventionally, as shown in Figure 1, a unit transformer containing the transformer contents 1 A plurality of containers 2 are placed side by side on a common base 3,
The oil ducts 5 are arranged and installed horizontally through the vertical flanges 4a of the connection ducts 4 provided so as to protrude horizontally from the side walls of each tank 2, and each oil duct 5 is installed in a low-pressure bushing pocket or a load tap. It is connected to the vertical flange 7 provided on the switching tank 6 and electrically connects the lead 8 through the oil duct 5, or as shown in FIG. Connection ducts 10 projecting horizontally are provided on opposing side walls, and the unit transformers are connected via vertical flanges 10a to the connection ducts 10, and low voltage bushing pockets or There is a device in which the on-load tap changer tanks 6 are connected via a vertical flange 7, and the leads 8 of each unit transformer are electrically connected through each connection duct 10.

By the way, in the split type transformer shown in FIG.
The connection duct 4 and the oil duct 5 are connected to the vertical flange 4.
This is done by bolting or welding at the tank 2 and oil duct 5 for this welding work.
A work space is required between the two. In addition, the number of connection points in the oil duct 5 separated from the tank 2 increases, and it takes a lot of time to connect the leads 8 inside the oil duct 5, and the inside of the transformer tank is exposed to the atmosphere for a long time. Since it is exposed, there is a risk of insulation failure due to moisture absorption.
Further, in the case as shown in FIG. 2, the vertical flanges 4 are bolted or welded to integrate the divided tanks 2, so a work space is required. Therefore, the space between each unit transformer tank 2 must be considerably widened. As a result, the connecting duct 10 becomes longer and the width of the tank 2 as a whole increases, making it impossible to fit within the transport limit dimensions, not only increasing the amount of materials such as insulating oil and leads, but also increasing the installation space for the transformer.
Particularly in the case of an underground substation or an underground power plant dug into a mountain, it is necessary to reduce the installation space for the transformer, and the above structure has the drawback of being uneconomical.

The present invention has been made to eliminate the above-mentioned drawbacks, and is intended to reduce the amount of insulating oil and internal connection materials and the number of on-site assembly work in a split type transformer that combines unit transformers into one. It is an object of the present invention to provide a split type transformer that can reduce the space required for installing the transformer.

An embodiment of the present invention shown in the drawings will be described below. In FIGS. 3 and 4, a tank 11 that stores the transformer contents 1 and constitutes a unit transformer has an oil duct 12 formed integrally with the tank 11 on one side wall and extending horizontally and parallel to the side wall surface. ing. Further, on the side where the oil duct 12 of this tank 11 is provided, an oil duct 12 is installed at least in the vertical corner of the side facing the tank of the adjacent unit transformer, as shown by hatching in FIG. An inclined portion 13 having a surface inclined with respect to the provided side wall surface is formed.

Therefore, a plurality of tanks 11 having such a structure are arranged side by side on the common base 3 together with the low-pressure bushing pocket or on-load tap changer tank 6, and the oil duct 12 of each tank 11 is located between each tank 11. If the leads 8 of each unit transformer are connected through the vertical flanges 12a provided in this way, and the leads 8 of each unit transformer are connected through the oil ducts 12, the unit transformers can be mechanically and electrically connected. In this case, in order to connect the oil ducts 12 of each tank 11 to each other, bolting or welding is performed at the vertical flange 12a, but an inclined part 13 is provided at the corner of each tank 11. Therefore, the space thus created can be used to perform the connection work.
Therefore, since the distance between each unit transformer can be narrowed, the installation space can be reduced, and the amount of insulating oil and internal connection materials can be reduced. Furthermore, even if the oil duct 12 is installed integrally with the tank 11, there is no need to widen the distance between the unit transformers, as described above,
The inside of 1 is not that big. Therefore, the oil duct 12 can be attached and transported together with the tank 11, reducing the work required to connect the internal leads 8 on-site and reducing insulation defects due to moisture absorption caused by exposing the inside of the transformer tank to the atmosphere. can be reduced to width.

Note that the on-load tap changer 6 and the adjacent tank 11 are connected by the oil duct 5, but in this case as well, the connection work can be performed using the space formed by the inclined part 13 formed in the tank 11. The distance between both tanks 6 and 11 can be narrowed. In addition, the inclined portion 13 of the tank 11 is connected to the transformer contents 1.
It is desirable to have as large an inclined surface as possible to the extent that there is no problem with insulation.

As explained above, according to the present invention, the installation space of a split type transformer can be reduced, the amount of insulating oil and internal connection materials can be reduced, and the assembly work and man-hours can be reduced, and the insulation inside the transformer can be reduced. It is possible to obtain a split type transformer that can greatly reduce defects.

[Brief explanation of the drawing]

FIGS. 1 and 2 are plan views showing the schematic structure of a conventional split type transformer, and FIGS. 3 and 4 respectively.
The figures are a plan view and a front view of a split type transformer according to an embodiment of the present invention. 1...Transformer contents, 3...Common base, 5,1
2... Oil duct, 11... Tank, 12a... Vertical flange, 13... Inclined part.

Claims (1)

[Claims] 1. An oil duct is formed on the side wall of the tank that houses the contents of the transformer, extending parallel to the side wall surface and in the horizontal direction, and a vertical corner portion of the side wall located on the duct side is formed with an oil duct extending in the axial direction of the oil duct. A unit transformer is constructed by forming an inclined part with an inclined surface, and a plurality of unit transformers are arranged side by side, and the oil ducts of each unit transformer are connected. A split type transformer made by connecting each unit transformer.