JPH0722519U - Split transport type three-phase transformer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a split-transport three-phase transformer that reduces the installation area, amount of insulating oil and transformer weight, and is easy to transport and assemble. [Structure] Openings Oa, Ob, Oc are formed on the side surfaces of the transformer tanks 2A, 2B, 2C of the single-phase transformers 1A, 1B, 1C, which are adjacent to each other, and flanges Fa, Fb, on the periphery of the openings. By providing Fc, the transformer main body 3A, 3B, 3
After C is put in from the opening of each tank, necessary wiring is provided, the flange is connected by a connecting means and sealed, and insulating oil is filled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a split-transport type three-phase transformer including a single-phase transformer.

[0002]

[Prior art]

 When the three-phase transformer becomes ultra-high-voltage, large-capacity, and ultra-large-sized, due to transportation restrictions, it is divided into three single-phase high-voltage transformers, transported separately, and reassembled at the installation site.

FIG. 3 is a conceptual explanatory view of this conventional split transportation type three-phase transformer, in which (A) is a partially cutaway front view and (B) is an enlarged view of a D portion of (A). In these figures, 10A, 10B and 10C are single-phase transformers, each consisting of separate transformer tanks 20A, 20B and 20C. Inside each of these transformer tanks 20A, 20B and 20C, an iron core is wound. A single-phase transformer body 30A, 30B, 30C in which a wire is wound is housed. 40A, 40B and 40C are lids of the respective transformer tanks 20A, 20B and 20C, and 50 is a substantially E-shaped duct, and the protrusions 50a, 50b and 50c are the lids 40A of the respective transformer tanks. , 40B, 40C and through holes 40a, 40b, 40c are oil-tightly mounted. Reference numeral 60 denotes an insulating lead wire, which is led out from the winding of each single-phase transformer main body 30A, 30B, 30C and connects the single-phase transformers through the duct 50. Each of the single-phase transformer tanks 30A to 30C has a connecting flange Ft as shown in FIG. 3B, and a lid 40A (40B, 40C) is provided on the upper surface of the flange Ft with a gasket Ga interposed. Then, the flange Ft and the edge of the lid 40A are oil-tightly sealed by a mounting means such as bolts or welding.

4 and 5 are schematic explanatory views of a split transportation type three-phase transformer equipped with a load tap switching device. FIG. 4 is a plan view and FIG. 5 is a partially cutaway front view. . A load tap switching device (hereinafter abbreviated as tap switching device) Tc is arranged on the side end side of each of the single-phase transformers 10A to 10C constituting the three phases. Reference numeral 70 denotes a tap changer tank in which a tap changer 80 including a tap selector 80a and a switch 80b is accommodated. The duct 50 extends to the upper portion of the tap switching device tank 70, and the tap switching device and each single-phase transformer are connected by a large number of insulating lead wires 60 and 61. The transformer tank, tap changer tank and duct are filled with insulating oil to maintain insulation.

Assembling and transporting is performed by assembling and arranging a single-phase transformer or a single-phase transformer and a tap changer during load at a assembling factory as shown in FIG. The equipment, the duct, and the tap changer during load are separated and transported separately to the installation site, and assembled and arranged again at the installation site as shown in Fig. 3 or Fig. 5, after which tests and other tests are performed before operation.

[0006]

[Problems to be solved by the device]

 As described above, each single-phase transformer has a structure in which the main body of the single-phase transformer is inserted into the transformer tank from the top and the top is sealed with the lid. Therefore, the same tank cannot be used in the same tank. Therefore, the lead wires of the single-phase transformer main body must be connected through a duct, and a space is required between the tanks. Therefore, (1) The required length of a large number of insulated lead wires is long, which increases the cost.

(2) In addition, since the duct is long, the number of connecting points increases due to transportation restrictions, etc. Therefore, it takes a long time to connect the factory and the site, which results in a large cost, and is not preferable in terms of quality.

(3) Since the duct is large, the amount of oil is large.

(4) Transportation of the duct is difficult and the cost is high.

(5) The required installation area as a three-phase transformer becomes large, and the size of the building becomes large when it is put in the building. The same is true for soundproof walls.

There is a problem that must be solved such as

The present invention has been made in view of the above points, and an object of the present invention is to provide a split-transport type three-phase transformer that reduces the installation area, the amount of insulating oil, and the weight of the transformer and is easy to transport. .

[0013]

[Means for Solving the Problems]

 Means for solving the above problems in the present invention is to form three-phase transformers by arranging three single-phase transformers in a line, and transporting by dividing each single-phase transformer at the time of transportation. In a split-transport type three-phase transformer that is reassembled and arranged in a single line at the installation site, open the side faces of the transformer tanks adjacent to each other of the single-phase transformers, and open the transformer body from this opening. Each transformer tank is integrally formed by oil-tightly connecting the flanges provided on the periphery of the opening with connecting means so that each transformer tank can be connected and connected in the tank. Do not use the duct.

Further, in the case of the three-phase transformer provided with the tap switching device at the time of load, an opening is provided on the side surface of the tap switching device tank so that the openings of the tanks of the adjacent single-phase transformers communicate with each other.

[0015]

[Action]

 When transporting, drain the insulating oil from the integrated transformer tank, disconnect the connection by the connecting means of each tank, disconnect the insulation lead wire between each single-phase transformer, and divide it. A temporary lid is attached to the opening of the transformer tank and each single-phase transformer is transported. If you have a tap changer, divide it by the same procedure and transport the tap changer tanks separately as well.

When assembling at the installation site, if there are three single-phase transformers and tap changers, remove the temporary lids including the tap changers and arrange them in a single row. Alternatively, after connecting the tap changer with an insulating lead wire, a gasket is interposed between the flanges of the tanks adjacent to each other and the flanges are oil-tightly connected by the connecting means, and the tanks are integrally connected and sealed. Fill with insulating oil.

[0017]

【Example】

 The present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is a conceptual explanatory view of the present invention, where (A) is a front view in which a main part is cut open, and (B) is an enlarged view of a flange part F surrounded by a dotted line in (A). In these figures, 1A, 1B and 1C are single-phase transformers, which are composed of transformer tanks 2A, 2B and 2C, respectively, and transformer bodies 3A, 3B and 3C housed in the respective transformer tanks. Each transformer tank 2A, 2B, 2C is provided with openings Oa, Ob, Oc on the side surfaces adjacent to each other as shown in FIG. Projected flanges Fa, Fb, Fc are provided.

FIG. 1 (B) is an explanatory view of the flange portion between the transformer tanks 2A and 2B (the same applies between the transformer tanks 2B and 2C). The transformer tank 1A has an opening on the adjacent 1B side. The transformer tank 1B has an opening Ob and a flange Fb on the adjacent 1A side (same for the 1C side).

When assembling, the single-phase transformer main bodies 3A, 3B, 3C are inserted into the respective transformer tanks 2A, 2B, 2C from the side openings, and the connections between the respective transformer main bodies are made into the transformer tanks. After connecting with the insulated lead wire 6 in the inside, flanges Fa and Fb of the transformer tanks 2A and 2B adjacent to each other as shown in FIG. 1 (B) are joined via a gasket Ga, and both flanges are bolted or welded. Use oil-tight seals and connect with other connecting means. Finally, perform a test after filling the tank with insulating oil. The insulation lead wires can be connected by connecting each tank and then inserting the hand through the hand hole H to connect.

When transporting, drain the insulating oil, disconnect the flange by bolts, welding, or other connecting means, disconnect the insulation lead wires between the transformer bodies, and open the transformer tank openings. Attach a temporary lid to and transport each single-phase transformer. Assembling at the installation site will be performed in the same way as assembly at the factory.

FIG. 2 is a front view of an embodiment of a split transportation type three-phase transformer equipped with a load tap changer, where Tc represents the load tap changer. Reference numeral 7 denotes a tap switching device tank. In the tap switching device tank 7, a tap switching portion 8 including a tap selector 8a and a switch 8b is housed.

In the case of the present embodiment, the transformer tank 2A adjacent to the tap switching device Tc is also opened on the side surface facing the tap switching device Tc to form an opening, and a flange is provided on the periphery thereof. Further, an opening and a flange are provided on the side surface of the tap switching device tank 7 facing the transformer tank 1A, and these flanges are hermetically connected by a connecting means such as bolts or welding as described above. Assembly and split transportation are performed in the same manner as in the embodiment of FIG.

[0024]

[Effect of device]

 As described above, the present invention integrally forms between the single-phase transformer tanks or between the transformer tanks and the tap changer tanks by opening the side surfaces adjacent to each other and communicating the tanks with each other. Therefore, since the insulation lead wires can be connected between the transformer bodies or between the transformer and the tap changer in the tank, many insulation lead wires can be short, and therefore, intermediate connection points can be used. Since the number of connections can be reduced, it is easy to connect to the factory and local installation work, and the time required for connection can be shortened.

Further, since the duct is not required, the amount of insulating oil required for the whole is reduced, the weight can be reduced, and the transportation is facilitated.

Further, since the side surface (side wall) between each tank is eliminated, there is no obstacle between each transformer main body, the insulation distance can be shortened, and the material can be saved.

Further, since the installation area of the transformer is small, the building can be made very small when installed in the building, and when the soundproof wall is provided, the soundproof wall can be reduced, and various other advantages are achieved. Be effective.

[Brief description of drawings]

FIG. 1 is a conceptual explanatory view of an embodiment of the present invention. (A) Front view. The enlarged view of F part of (B) and (A) figure.

FIG. 2 is a conceptual explanatory view of another embodiment of the present invention.

FIG. 3 is a conceptual explanatory view of a conventional example. (A) Front view. The enlarged view of the mouth of FIGS.

FIG. 4 is a plan view of a conventional example.

FIG. 5 is a conceptual explanatory view of a conventional example.

[Explanation of symbols]

 1A, 1B, 1C ... Single-phase transformer 2A, 2B, 2C ... Transformer tank 3A, 3B, 3C ... Transformer body 6,61 ... Insulation lead wire Tc ... Tap switching device at load 7 ... Tap switching device tank 8 ... Tap switching part Qa, Ob, Qc ... Opening part Ga ... Gasket

Claims (2)

[Scope of utility model registration request] 1. A three-phase transformer is formed by arranging three single-phase transformers in a row, and each single-phase transformer is divided and transported at the time of transportation, and reassembled and arranged in a row at the installation site. In the split transportation type three-phase transformer, the side surfaces of the transformer tanks adjacent to each other of the single-phase transformers are opened, the transformer main body is inserted from this opening, and a flange is provided on the peripheral portion of the opening. A split-transport type three-phase transformer characterized in that each transformer tank is integrally formed by oil-tightly connecting with each other by connecting means, and the inside of each transformer tank is communicated. 2. A three-phase transformer equipped with a load tap switching device is formed by arranging three single-phase transformers and a load tap switching device in a line, and each single-phase transformer and a load load tap switching device are formed during transportation. A split-transport type three-phase transformer in which each tap changer is transported separately and reassembled and arranged in a row at the installation site, wherein each single-phase transformer and the load tap changer adjacent to each other are connected to each other. Tank and tap switching device Open the side surface of the tank, insert the transformer main body and tap switching device from this opening, and connect the flanges provided at the periphery of the opening oil-tightly by connecting means to each transformer tank and tap A split-transport type three-phase transformer characterized in that the switching device tank is integrally formed, and each transformer tank and the tap switching device tank are communicated with each other.