JPH04116806A - Assembling method for gas-insulated transformer - Google Patents

Abstract

PURPOSE:To sufficiently secure the strength in transit thereby enabling the quality assurance and the simplification of a transportable tank and the site operations to be secured by a method wherein the transportable tank is divided into two tanks to be connected by horizontal flanges provided on the lower part than the lowermost surface of the transformer main body while at a site, the upper tank is removed and then the transformer main body is drawn out in the lateral direction to be contained in the other specific tank. CONSTITUTION:A transportable tank 15 is composed of a transportable upper tank 16 and a transportable lower tank 17 respectively provided with horizontal flanges 16a, 17a for connecting the tanks 16, 17 with each other using bolts. At this time, the horizontal flange 17a of the lower tank 17 is provided on the lower part than the lowermost surface of the transformer main body 2. On the other hand, at a site, after setting up the transportable tank 15, another tank 1B and an intermediate rack 20, the transportable upper tank 16 is removed and then the transformer main body 2 is shifted in the arrow direction to be drawn in the tank 1B. After finishing the drawing step, the intermediate rack 20, etc., is removed and the opening part of the tank 1B is fitted with a cover and then the specified steps such as the insulating gas sealing up step, etc., are performed.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a method for storing a transformer body consisting of an iron core and a coil in a tank filled with an insulating gas such as SF or gas. The present invention relates to a method of assembling a gas insulated transformer.

(Prior art) Recently, a so-called gas-insulated transformer has been developed as a non-flammable transformer to replace an oil-immersed transformer, which uses non-flammable insulating gas (for example, SFG gas) as a cooling and insulating medium instead of insulating oil. 9 In such gas-insulated transformers, both the unit capacity and voltage have increased, and the transformer has a voltage of 200 to 300 MVA, 275 to 50 mVA.
There is an increasing demand for 0KV class large capacity and high voltage.

Therefore, in terms of withstand voltage and cooling performance, a gas pressure of 2 kgf/cdG is recommended for a high voltage, large capacity gas insulated transformer.
For example, the pressure is set to about 4 kgf/cdG and is often used as a tank pressure vessel.

As an example, Figures 5 and 6 show tank IA
This is a plan cross-sectional view of a gas insulated transformer in which tank IB is a vertical pressure vessel, tank IB is a horizontal pressure vessel, and a transformer body 2 consisting of a coil and an iron core is housed, but the pressure vessel is a cylindrical horizontal pressure vessel. is common.

As can be seen from Fig. 5, the coil outer diameter dimension a
Since the core size is about 1.5 to 2 times larger than that of
This is because a spherical vertical pressure vessel has the disadvantage of increasing dead space and increasing external dimensions.

Therefore, as shown in Fig. 6, as a horizontal pressure vessel,
A structure in which the vertical flange 3 is provided and the transformer main body 2 is pulled in from the side has the advantage of allowing for a more compact design.

(Problems to be Solved by the Invention) By the way, when transporting a transformer having the above configuration to a remote location, freight car transport is generally used.

During this freight car transportation, as shown in Figure 7, tunnels,
There is a freight car transportation limit of 4 due to the dimensions of the platform, etc., and a dimensional limit is added to the outer diameter of the tank IA.

On the other hand, as the transformer capacity increases and the shape of the transformer main body 2 becomes larger, the tank shape becomes larger due to consideration of insulation distance, etc., and it becomes difficult to keep the tank within the transport limit size according to the freight car transport limit 4.

Therefore, as shown in Figure 8, taking advantage of the fact that the gas pressure during transportation is lower than that during operation, the transformer main body 2 is transported in a transport tank 5 that meets the transport restriction dimensions, and the transformer body 2 is transported horizontally at the site. The method used is to draw it into a pressure vessel.

Figure 9 shows how the transformer main body 2 is drawn into the tank IB, which is a horizontal pressure vessel at the site. Generally speaking, the tank 5 for transportation is constructed so that the strength in the longitudinal direction of the tank is the same. Generally, a horizontal reinforcing beam 6 is attached to the bolt, and a horizontal flange 7 is provided at the top to prevent an excessive load from being applied to the bolt.

When adopting such a structure, at the site, the transformer main body 2 is first lifted out of the transport tank 5 using a portal crane 8, etc., and placed on the insertion frame 9, as shown by the arrow in the figure.
A method is used to draw it into tank IB, which is a horizontal pressure vessel.

However, this method has disadvantages in that the equipment such as the gantry crane 8 becomes larger and the measures for dust prevention and the like become complicated.

Therefore, as a means to solve the above drawbacks, the first method is
As shown in Figure 0, the transport tank 10 is of a vertical flange type in which a vertical flange 11 is provided horizontally along the vertical direction.
There is a method of removing the tank cover (not shown) at the site and then pulling the transformer main body 2 into the tank IB, which is a horizontal pressure vessel, without lifting it out.

However, in this case, the strength of the tank in the longitudinal direction is discontinuous at the vertical flange against the load applied during transportation using the Schnabel 12 as shown in FIG.
The drawback was that an excessive load was applied to the bolt.

The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to ensure sufficient strength during transportation and ensure the quality of transportation tanks and field work.

An object of the present invention is to provide a simplified method for assembling a gas insulated transformer.

[Structure of the invention]

(Means for Solving the Problems) The present invention involves transporting a transformer body consisting of a coil and an iron core in a transport tank, and then taking the transformer body out of the transport tank at the site and storing it in a predetermined tank. In this method of assembling a gas insulated transformer, the transport tank is divided into two parts, an upper and a lower part, and are joined by a horizontal flange provided below the lowest surface of the transformer body. At the site, the upper part of this transportation tank was removed, the transformer body was pulled out laterally, and it was stored in a designated tank.

(Function) By structuring the transportation tank with horizontal flanges, the continuity of the horizontal reinforcement beams is maintained, and all cross sections in the longitudinal direction of the tank have the same shape and the same strength. Excessive axial force is borne by the beam and applied to the horizontal flange bolts.

It is possible to create a structure that allows stable transportation without bending stress.

Additionally, by providing the horizontal flange below the bottom surface of the transformer body, after removing the top of the transport tank on-site, it is possible to quickly pull the transformer horizontally into the designated tank without lifting it out. .

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram cut away to show a freight car transportation state in an embodiment of the present invention.

First, when transporting by freight car, the main body of the transformer 2 is
is stored in the transportation tank 15. This transport tank 15 includes an upper transport tank 16 and a lower transport tank 17.
The horizontal flanges 16a and 17a provided on each of these are fastened with bolts. A support pedestal 18 for the transformer body 2 is attached to the lower transport tank 17, and the transformer body 2 is supported on the upper surface of the support pedestal 18 via a sliding plate 19.

Here, the horizontal flange 17a of the lower transportation tank 17 is provided below the lowest surface of the transformer body 2.

Further, a horizontal reinforcing beam 6 is attached to the upper transportation tank 16 along the longitudinal direction. Therefore, since both longitudinal sections have the same shape and the same strength, the load that is applied during transportation can be borne by the transverse beam 6, and there is a risk that an excessive load will be applied to the horizontal flanges 16a and 17a. There is no.

Next, at the site, after setting the transport tank 15 (however, the upper transport tank 16 is indicated by a dashed line), tank IB, and intermediate frame 20 as shown in Fig. 2, the upper transport tank 16 is removed. , move the transformer main body 2 in the direction shown by the arrow in the figure and draw it into the tank IB. In this case, since the horizontal flange 17a is provided below the lowest surface of the transformer main body 2, there is no need to lift the transformer main body 2, and the transformer main body 2 can be drawn into the tank IB while sliding through the sliding plate 19. be able to. After this retraction, the intermediate frame 20 and the like are removed, a cover is attached to the opening of the tank IB, and necessary operations such as filling insulating gas are performed.

Therefore, equipment such as cranes can be simplified, and not only the on-site work space can be reduced, but also the time required for on-site work can be shortened, and measures against dust and the like can be easily taken.

Note that the present invention is not limited to the above-described embodiments, and can be implemented in various modifications. That is, as shown in FIG. 3, the transformer main body 2 is stored in a transport tank 15 similar to that of the above-described embodiment and transported by freight car. However, the sliding plate 7 is not interposed between the transformer main body 2 and the support frame 18.

Next, at the site, as shown in FIG. 4, the transport tank 15 (however, the upper transport tank 16 is shown by a dashed line), the tank IB, and the insertion frame 21 are set as a set.

Here, a sliding plate 19 is interposed between the insertion frame 21 and the transport tank 15. After the above setting, the upper transport tank 16 is removed, and the transformer body 2 is moved in the direction of the arrow while sliding along with the lower transport tank 17 via the sliding plate 19, and drawn into the tank IB. The lower transport tank 17 is used as it is as a support frame for the transformer main body 2 in the tongue IB. After the transformer main body 2 is drawn in, the insertion frame 21 is removed, a cover is attached to the opening of the tank IB, and necessary operations such as filling insulating gas are performed.

Therefore, in this embodiment, as in the above-mentioned embodiment, equipment such as cranes can be simplified, and not only the on-site work space can be reduced, but also the time required for on-site work can be shortened, and measures against dust etc. can be easily taken. becomes.

〔Effect of the invention〕

As explained above, according to the present invention, by making the transportation tank have a structure with horizontal flanges, the continuity of the horizontal reinforcing beams is maintained, and all cross sections in the longitudinal direction of the tank have the same shape and the same strength. Therefore, the load that is applied during transportation is borne by the horizontal reinforcing beams, making it possible to create a tank structure for transportation in which no excessive load is applied to the flange portion.

In addition, by attaching the horizontal flange below the lowest surface of the transformer body, it is possible to quickly pull the transformer body into the tank without lifting it from the transport tank on site, simplifying equipment such as cranes. It is possible to provide a method for assembling a gas insulated transformer that can reduce the on-site work space, shorten the time required for on-site work, and easily take measures against dust and the like.

[Brief explanation of drawings]

FIG. 1 is a cutaway explanatory diagram showing a freight car transportation state in an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an on-site assembly state in an embodiment of the present invention, and FIG. FIG. 4 is an explanatory diagram showing the on-site assembly state in another embodiment of the present invention; FIG. FIG. 6 is a cross-sectional plan view of the transformer, FIG. 6 is a cross-sectional plan view of a gas insulated transformer housed in a horizontal pressure vessel, and FIG. FIG. 8 is a cut-away explanatory diagram showing the transformer body stored in a conventional transportation tank and transported by freight car. FIG. 9 is an explanatory diagram showing the conventional on-site assembly state. FIG. 10 Figure 11 is an explanatory diagram showing the on-site assembly state of the transformer housed in a conventional transport tank, which is different from Figure 8.
FIG. 2 is an explanatory diagram showing the load that acts during freight car transportation when the transformer main body is housed in the transportation tank shown in FIG. 1B...Tank, 2...Transformer body 4...
Freight car transport limit, 6... Lateral reinforcement beam 15... Transport tank, 16... Upper transport tank 17... Lower transport tank, 16a, 17a... Horizontal flange

Claims (1)

[Claims] A transformer body consisting of a coil and an iron core is stored in a transport tank and transported, and at the site the transformer main body is taken out from the transport tank, stored in a designated tank, and then filled with insulating gas. In the method for assembling an isolation transformer, the transport tank is configured to be divided into upper and lower halves and joined by a horizontal flange provided below the lowest surface of the transformer body, and at the site, the upper part of the transport tank is A method for assembling a gas insulated transformer, characterized in that the main body of the transformer is pulled out laterally after being removed and then stored in the predetermined tank.