JPH063772B2 - Transformer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transformer configured to significantly reduce the weight and size of a transformer during transportation.

[Prior Art] In recent years, as the demand for electric power has increased, the power transmission system has become higher in voltage such as 500 KV transmission, and the capacity of transformers used for power transmission and transformation has also increased. In addition, the transmission distance has become longer, and the transformer is often installed in a mountainous area where the transportation conditions are more severe, and it is desired to greatly reduce the weight and size during transportation.

Conventionally, for example, in the case of a 300 MVA class transformer, it is divided into three unit transformers for transportation, and the unit transformers of the three-phase batch tank or duct unit are connected and connected at the site to make the three-phase wiring, thereby the three-phase wiring. There is a method of configuring as a transformer. On the other hand, the transformer assembled at the factory is equipped with iron core legs, iron core upper and lower yokes,
There is also a method of disassembling each part such as coils and split tanks and reproducing them locally.

[Problems to be solved by the invention] In the case of the former transportation assembly method, the transportation amount of a unit transformer is limited to about 50 tons, and transportation to a mountainous area where transportation conditions are severe Is difficult. Also, in the latter transportation and assembly method, transportation is easy,
It is necessary to have equipment to stand up after the iron cores have been placed and assembled locally. Furthermore, it takes a long time to assemble the contents, and the winding insulation is exposed during this time, so that a content drying step is required.

An object of the present invention is to provide a transformer capable of significantly reducing the transportation weight and size and reducing the on-site installation space and installation work time.

[Means for Solving Problems] A transformer according to the present invention includes a transformer content including an iron core and a winding that can be divided into two or more content units, and a winding portion of each content unit. Central tank to store
A lower tank that is directly connected to the lower part of the central tank and stores each lower core yoke part of each content unit, and an upper yoke part of each core unit that is directly connected to the upper part of the central tank It is characterized by being configured with an upper tank for individually storing

[Operation] In the transformer according to the present invention, the lower tank 5a is assembled with the iron core leg 2a and the lower yoke 2c, and the temporary cover 8 is attached thereto for transportation. The winding 3 and the iron core upper yoke 2b are also transported in the transport tanks 10 and 9, respectively. At the site, the transport units for each phase are arranged at the regular installation position and the lower tanks 5a for each phase are connected together. The central tank 5b is assembled on the connecting line of the lower tank 5a. After that, the winding 3 is housed in the iron core leg 2a of each phase, the iron core upper yoke 2b is assembled, and then the upper tank 5c is mounted.

In this way, transportation and assembly can be carried out easily.

[Example] The transportation of the transformer according to the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, a content 1 composed of an iron core 2 and a winding 3 is constructed in units of each phase (1A, 1B, 1C). The tank 5 that stores the contents 1 together with the insulating oil 6 is divided into three or more parts (5a, 5b, 5c) in the height direction.
The central tank 5b facing the winding portion is not divided into each phase unit but has an integral structure, and the height H of the tank is larger than the winding height P. The lower tank 5a is divided for each phase to support the contents 1 of each phase unit, and the upper tank 5c is also divided for each phase so as to cover the upper part of the contents 1 of each phase unit.

With this configuration, as shown in FIG. 2, the temporary cover 8 is attached to the lower tank 5a in a state in which the winding core 3 and the iron core leg 2a without the iron core upper yoke 2b and the lower yoke 2c are properly assembled. The lower tank 5a is fixed to the transportation beam 11 so that it can be transported. Further, the upper yoke 2b and the winding wire 3 are connected to the transport tank 9 as shown in FIGS. 3A and 3B, respectively.
And put in 10 and transport. By covering the winding 3 with a flexible airtight sheet 12 before putting it in the transportation tank 10, it is possible to measure dustproofness and moistureproof at the time of on-site assembly.

Fig. 4 and Fig. 5 show the transformer assembly method at the site. Lower phase tank 5a with transport units for each phase lined up at the regular installation position
They are connected to each other by the connecting member 5d. Each phase winding 3 is 4th
As shown in the figure, it is hung from the transportation tank 11 by the lifting device 3 and inserted into the iron core leg 2a. Since the winding 3 is hermetically protected by the dustproof and moistureproof sheet 12 during this work, foreign matter is not mixed in and moisture is prevented, and the reliability of the contents can be sufficiently maintained. Further, by covering the entire transformer with the chamber 14 to which the dry air generator 15 is connected during the winding insertion work, the dustproof and moistureproof effects can be further enhanced.

The upper yoke 2b is assembled after the three-phase integrated central tank 5b is assembled as shown in FIG. To facilitate this operation, the central tank 5b has an upper surface provided with an opening 5e through which the upper yoke portion of each phase iron core projects S from the upper surface. As a result, the contents are protected by the tanks 5a, 5b, 5c during the assembling work of the upper yoke blank, which requires the longest time, and the reliability can be ensured.

FIG. 6 shows an embodiment of the configuration of a transformer provided with a load tap changer 16 and a bushing 17 for 3-phase Δ connection. Three-phase △ connection lead 19 in the tank upper opening 5e
It is easily configured by connecting the duct 18 containing the a and tap lead 19b.

Although the three-phase device has been described above, the same transportation and assembling can be applied to the single-phase device.

In the thus constructed transformer of the present invention, the content of the three-phase transformer, which is composed of the iron core and the winding, is composed of three single-phase transformers. When transporting the transformer, the winding and the upper core yoke are separately disassembled except that the contents of each phase unit are further assembled with the core legs and the lower yoke in a normal state. The regular semi-assembled iron core, which is the largest package, will be transported with the temporary cover attached while it is stored in the lower tank disassembled for each phase. The windings are assembled and stored in a temporary tank and transported, but before being put in the temporary tank, the entire outer surface is covered with a flexible dustproof and moistureproof sheet.

Further, since the iron core upper yoke is assembled at the site after assembling the three-phase batch tank having the openings exposing the upper yoke portions of the respective phases, dust-proof and moisture-proof measures can be taken sufficiently.
Further, since the winding portion is arranged in the three-phase batch tank, the installation space can be greatly reduced as compared with the three-unit transformer type system.

Also, according to this method, the maximum transport weight of a 300 MVA class transformer will be about 20 tons or less, and it will be possible to transport trailers to locations where rail transport is impossible. In addition, since the winding is covered with a dustproof and moistureproof sheet that is sealed while the contents are exposed during on-site assembly, no special drying process or iron core assembly equipment is required, and the on-site installation period and cost can be reduced.

[Advantages of the Invention] As described above, in the present invention, the transformer contents are divided into two or more contents units, and the transformer tank is a central tank for accommodating windings of the respective contents units, and a transformer. By constructing each of the upper and lower yokes of the contents individually with the upper tank and the lower tank, the transport weight and size can be greatly reduced, and the on-site installation space and installation work time can be reduced. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a transformer according to the present invention,
FIG. 2 is a configuration diagram showing a transportation state of main parts, FIGS. 3A and 3B are configuration diagrams showing a transportation state of an upper yoke and windings, and FIGS. 4 and 5 are assembly methods of a transformer of the present invention. FIG. 6 is a configuration diagram for explaining the above, and FIG. 6 is a configuration diagram showing another embodiment of the transformer of the present invention. 1A, 1B, 1C ... Contents of each phase unit 2, 2a, 2b, 2c ... Iron core, legs, upper and lower yokes 3 ... Windings 4a, 4b ... Upper and lower iron core clamps 5a, 5b, 5c ... Split tank 6 ... Insulating oil 8, 9 , 10 ... Transport tank 12 ... Winding protection sheet 14 ... Room 15 ... Dry air generator 16 ... Load tap changer 17 ... Three-phase △ connection bushing 18 Duct

Claims (1)

[Claims] Claim: What is claimed is: 1. A transformer content including an iron core and a winding that can be divided into two or more content units, a central tank for accommodating a winding part of each of the content units, and a central tank. Directly connected to the lower part of each core unit to separately store each core lower yoke part of each content unit, and directly connected to the upper part of the central part tank to separately store each core upper yoke part of each content unit. A transformer characterized by being configured with an upper tank that operates.