JPH06196343A - Transporting method for transformer - Google Patents

Abstract

PURPOSE:To realize a method for transporting a large capacity transformer in which restriction on transporting can be avoided without increasing an installation size of a tank by separating a winding and a core by removing an upper yoke of the core, packing the winding with a moisture-proof film, incorporating them in special purpose transportation tanks for transportation. CONSTITUTION:An upper tank 4 is removed, an upper yoke 5 of a core is further disassembled, and contained in a special purpose transportation tank 6. Then, a winding 3 is removed from the core 2, packed with a moisture absorption preventive film 7, and then contained in a special purposed transportation tank 8. A core 9 in which the upper yoke is removed and a lower tank 10 are covered with a transportation temporary cover 11. After a content of a three-phase transformer and the tank are transported to an installation place, the tank 10 and the temporary cover are set on a foundation, the cover 11 is removed, the winding 3 is inserted into the core, the yoke 5 is assembled, covered with the tank 4, and then leads are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transporting a large-capacity transformer, and more particularly to a method of transporting a transformer in which the contents are partially disassembled and transported in order to significantly reduce the weight and size during transportation.

[0002]

2. Description of the Related Art In recent years, as the demand for electric power has increased, the transformers used for power transmission and transformation have become larger in capacity and larger in size. On the other hand, a transformer substation in which a transformer is installed is often constructed in a mountainous area where transportation conditions are severe. Therefore, it is desired to significantly reduce the transportation weight and the transportation size of the transformer. In particular, the size and weight restrictions for rail transportation are absolute, and if they are not satisfied, transportation will not be practically possible.

In order to solve the above-mentioned transportation problem, the conventional transformer transportation method is divided into a plurality of unit transformers.
Each unit transformer is stored in each tank and transported, and the method of reducing the transport weight and the transport dimension by taking a method such as connecting the lead wires with an oil duct etc. and assembling into an integrated transformer at the site. Came.

Current technology uses 275 kV, 450 MV
A three-phase transformer of about A is the largest one that can be transported by freight car as a single unit, and if the capacity exceeds that, both the size and weight will exceed the current rail transport limit. Therefore, in such a case, make it so that it can be divided into two unit three-phase transformers or three unit single-phase transformers, transport each unit transformer separately, and install an oil duct etc. on site. Then, there was no choice but to connect the lead wires in this and assemble it into an integrated transformer.

[0005]

It is generally known that the weight of a material used for a transformer is proportional to about 0.75th power of the transformer capacity. Therefore, one transformer of a certain capacity
If two unit transformers with a capacity of / 2 are used, the material used is (1 /
2) ^0.75 x 2 = 1.19 times.

It is known that the size (installation area) of a transformer tank is generally proportional to the transformer capacity to the power of 0.5. Therefore, if a transformer with a certain capacity is composed of two unit transformers with a capacity of ½, the size is (1/2) ^0.5 × 2 = 1.4, compared with the case where it is composed with one unit transformer.
Doubled.

Thus, in order to avoid transportation restrictions,
In the method that can be divided into small capacity unit transformers,
As a result, the number of materials used increases, which in turn increases the price of the transformer, and also increases the installation size of the tank.

The present invention has been made to solve the above-mentioned drawbacks of the prior art. The purpose of the present invention is to transport a large-capacity transformer capable of avoiding transportation restrictions without increasing the materials used and the installation dimensions of the tank. To provide a method.

[0009]

In order to achieve the above object, the method of transporting a transformer according to the present invention is designed such that after the factory test of the transformer is completed, the upper yoke of the iron core is removed to separate the winding from the iron core. Then, the winding is packed with a moisture-proof film to prevent moisture absorption and stored in a special transport tank for transportation, and the iron core is stored in a special transport tank with the upper yoke removed and transported, and the disassembled upper part The feature is that the yoke is also stored in a dedicated transport tank and transported, and then the winding wire is inserted into the iron core and the upper yoke is stacked on site to assemble the contents.

[0010]

According to the transformer transport method of the present invention, the size and weight of each transport unit can be significantly reduced as compared with the case where the contents are transported as a unit. For example, 275kV, 4
In the case of a three-phase transformer of about 50 MVA, the maximum weight of the transport unit is the iron core, but the weight is about 70% of the case where the contents are transported together. In addition, although the transport unit with the maximum width is a winding, since it is housed in a tank for transportation, insulation dimensions with the tank are not required and reinforcement of the tank is not required.
The size is about 80% compared to the case where they are transported together.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. Fig. 1 shows a three-phase transformer in which the factory test is completed and the exterior parts are removed. Fig. 1 (a) is a front view,
The figure (b) is a side view of the figure (a). As shown in these figures, a tank 1 contains the contents consisting of an iron core 2 and windings 3. 4 is an upper tank and 10 is a lower tank. From this state, as shown in FIGS. 2A to 2D, first, the upper tank 4 is removed, the upper yoke 5 of the iron core is further disassembled, and the upper yoke 5 is housed in the dedicated transportation tank 6. (Figure d). Next, the winding wire 3 is taken out from the iron core 2, packed with a moisture absorption preventing film 7, and then stored in a transport tank 8 dedicated to the winding wire (FIG. 7C). Iron core 9 and lower tank 1 with the upper yoke removed
0 is covered with a temporary cover 11 for transportation (a and b in the same figure). Although not shown, the lead wire and an insulator supporting the lead wire are appropriately stored in the upper tank 4 or a dedicated transportation tank and cured so as not to absorb moisture during transportation.

In the above-mentioned state, the contents of the three-phase transformer and the tank are transported to the installation site and then assembled in the following order. That is, first, the lower tank 10 in which the iron core is stored
And a temporary cover for transportation set on the foundation, and then the temporary cover 1
Remove 1. After that, the winding 3 is inserted into the iron core 9, the upper yoke 5 is assembled, the upper tank 4 is covered, and then the lead wires are connected. After that, in the same way as a normal transformer, insulating oil is filled, exterior parts such as a cooler are assembled, and the on-site assembly is completed.

By transporting by the above method, the size and weight of each transport unit can be greatly reduced as compared with the case where the contents are transported together. That is, in terms of weight,
Although the lower tank that stores the iron core and the temporary cover are the heaviest, the winding and the upper yoke are eliminated and the upper tank can be lightened with the temporary cover, compared to the case where the contents are transported as a single unit. Approximately 70 of the method (transportation of contents)
%.

Although the transportation width can be reduced in terms of dimensions, the conventional maximum transportation width is the winding diameter plus the insulation dimension between the winding and the tank and the thickness of the tank reinforcing member. Although the size is the transportation width, according to the present invention, the windings are stored in a temporary transportation tank that requires almost no reinforcement and transported, so that the winding distance is reduced by the insulation distance from the tank and the thickness of the reinforcing member. Compared to the method of transportation (integrated transportation of contents), it can be reduced to about 80
%. Although the three-phase transformer has been described above, the same effect can be obtained by applying the present invention to a single-phase transformer.

In the above embodiment, the iron core from which the upper yoke is removed is placed on the lower tank, and the temporary cover for transportation is placed on the core for transportation. However, the iron core is stored in another tank for transportation and transported. Also has the same effect.

[0016]

As described above, according to the present invention,
The transport size and weight of the transformer can be greatly reduced compared to the case where the contents are transported as a unit. Along with this, in the conventional technology, a large capacity transformer, which had to be composed of two unit transformers of 1/2 capacity, can now be composed of one unit transformer, and the material used can be reduced. In addition, the cost of the transformer can be reduced, and the installation size of the tank can be reduced.

[Brief description of drawings]

FIG. 1 (a) is a front view of a three-phase transformer to which the present invention is applied, and FIG. 1 (b) is a side view of FIG. 1 (a).

2A to 2D are views for explaining a method of transporting a transformer according to the present invention.

[Explanation of symbols]

1 ... Tank, 2 ... Iron core, 3 ... Winding, 4 ... Upper tank, 5
... upper yoke, 6 ... upper yoke transport tank, 7 ... moisture absorption prevention film, 8 ... winding transport tank, 9 ... iron core with the upper yoke removed, 10 ... lower tank, 11 ... temporary cover.

Claims (1)

[Claims] 1. After the factory test of the transformer is completed, the upper yoke of the iron core is removed to separate the winding from the iron core, and the winding is packed with a moisture-proof film for preventing moisture absorption and stored in a dedicated transport tank. The iron core is stored in a dedicated transport tank with the upper yoke removed, and the disassembled upper yoke is also stored in a dedicated transport tank before being transported and then the winding is inserted into the iron core on site. , A method of transporting a transformer, characterized by stacking upper yokes and assembling the contents.