JPH025604Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to the structure of the connection parts of gas-insulated electric appliances in which each unit circuit is stored in an airtight container and transported separately and connected to each other at the installation site. .

[Prior art and its problems]

Gas-insulated hermetic switchgear (GIS) is known as this type of gas-insulated electrical equipment, but it is transported separately for each line or each phase, and the sealed container and high-voltage conductor are interconnected at the installation site. When connecting and integrating the parts, it is normal to remove the insulating gas from the joints as well as from each sealed container, so when the assembly is completed, each sealed container must be evacuated and filled with gas. . Therefore, there are problems such as transporting equipment for gas filling processing to the installation site and a large amount of man-hours and time required for gas filling work, and improvements to these problems are desired. On the other hand, in low gas pressure insulated equipment such as gas insulated switchboards where the voltage of the electric power system to which it is applied is low, and which are used by filling insulating gas near atmospheric pressure, evacuation is not performed in order to simplify the airtight container. In general, a displacement filling method that takes advantage of the difference in specific gravity between an insulating gas and air is used, but it still requires equipment for gas displacement and has the disadvantage that the gas displacement operation takes a long time.

FIG. 1 is a structural diagram of an improved conventional gas insulated electrical appliance, in which a cone-shaped spacer 7a is conductively connected to high voltage conductors 4a and 4b housed in two closed containers 1a and 1b and airtightly attached to each closed container. and 7b are connected by a bushing 6 having a connecting conductor 8. Therefore, it is possible to connect the two sealed containers in the atmosphere, and there is no need to fill the joint with gas. By transporting the product, gas filling work at the installation site becomes unnecessary. However, the method of connecting in the atmosphere using such bushings has problems such as the large air creepage distance of the bushings, the length of the connection part, and the high cost of the connection part including the cone-shaped spacer. There are drawbacks.

[Purpose of invention]

This idea was created in view of the above-mentioned situation.
It is an object of the present invention to provide a low gas pressure insulated electrical appliance having a connection structure that simplifies the connection work at the installation site and the accompanying gas filling work.

[Key points of the idea]

According to the present invention, the above-mentioned object is to connect the connected sealed containers to each other by means of a connecting pipe body having a hand hole gas-separated by an insulating spacer airtightly attached to each of the connected sealed containers, and to The end portions of high voltage conductors that are insulated and supported by spacers and drawn out into the connecting tube are connected to each other through the hand hole, and are arranged so as to communicate with the connecting tube and one of the sealed containers. This was achieved by simplifying the gas filling work at the installation site by gradually transferring a part of the insulating gas filled in the one sealed container to the connecting pipe body side through the gate valve. .

[Example of idea]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a schematic sectional view of the main parts of a gas insulated electric appliance showing an embodiment of the present invention. In the figure, reference numerals 11 and 12 are closed containers to be connected that house electrical equipment (not shown), and flanges 11a and 12a provided on the respective side walls have insulating spacers 1 for gas division.
5 is airtightly attached, and the high voltage conductor 14 is insulated and supported by the insulating spacer 15 so that one end thereof protrudes to the side of the sealed container. It is airtightly fixed by means. Also 17
is an airtight connecting pipe body having a hand hole 18,
Both ends thereof are connected to flanges 11a and 12a of the closed containers by flanges 17a and 17b, so that the connected closed containers 11 and 12 are interconnected via the connecting pipe body 17. Also, high voltage conductor 1
Both ends of 4 are conductively connected to each other within the connection box body 17 by a connecting member such as a bolt using a connecting conductor 16, for example. The hand hole 18 is provided for connecting high-voltage conductors, but it is also provided at the upper part of the connection box 17 so that it also serves as an air flow path for gas replacement work, which will be described later.
Reference numeral 20 denotes a gate valve attached to one side of the sealed container 11 to be connected, and a connecting pipe 19 connects the pipe body 1.
It is formed so as to communicate with the bottom part of 7.

The low gas pressure gas insulated electrical appliance assembled in this way is manufactured by filling the airtight container 12 with an insulating gas, such as SFe gas, at a predetermined pressure in advance at the manufacturing site, and filling one of the airtight containers with insulating gas, which is filled into the connecting pipe body. Fill each with extra gas, and when the assembly is completed, gradually open the gate valve 20 to allow the air in the connecting pipe body 17 to overflow, for example by opening the lid of the hand hole 18 narrowly, so that some of the insulating gas flows through the hand. If the hand hole is closed after confirming that it has flowed out from the hole (referred to as the displacement method), the gas pressures in both containers will be balanced through the gate valve 20, and the amount of air mixed in the connecting pipe body 17 will be reduced. A small amount of insulating gas can be filled. Furthermore, if the purity of the insulating gas may be low, the above-mentioned insulating gas transfer operation may be performed with the hand hole closed.

It goes without saying that if a portion of the connecting pipe body 17 is made of something flexible or stretchable, it will be easier to connect the closed containers to each other.

Fig. 3 is a cross-sectional view of the main parts showing a different embodiment of the present invention.The difference from the embodiment of Fig. 2 is that the connecting pipe body is formed integrally with one of the closed containers, thereby reducing the size of the device. That's what I did. In the figure, airtight container 2
1 to the airtight container 11 side to form a flange 21.
a directly connected to the closed container 11, and a flange 21b provided at an angle inside the closed container 21.
Due to the insulating spacer 25 airtightly attached to the
A gas-separated connection box 27 was formed by partitioning a part of the closed container 21. By forming it in this way, the distance between the closed containers 11 and 21 required for connecting the closed containers 11 and 21 to be connected is shortened, and the installation area for electrical appliances can be reduced, and the volume of the connection box 27 is also reduced. By doing so, an advantage can be obtained that the amount of gas to be filled into the closed container 21 can be reduced.
Although FIG. 3 shows an example in which the high-voltage conductor 14 is connected at multiple locations using two connecting conductors 16a and 16b and an embedded conductor 24,
By changing the arrangement of the conductors, the number of connection points can be easily reduced.

FIG. 4 is a sectional view of the main parts showing another embodiment of the present invention, and the difference from the embodiment of FIG. 2 is that the gate valve 40
is provided inside the connecting tube body 17, and the piping 41 communicating with the connecting tube body 17 is arranged along the inner surface of the connecting tube body, and its opening is located at the bottom of the connecting tube body 17. be. The figure shows an example in which the gate valve 40 is placed close to the hand hole and communicates with the closed container 11 through a hole drilled in the flange 11a of the closed container 11. The structural arrangement is arbitrary.
In the gas insulated electric appliance configured in this way, when transferring a part of the insulating gas filled in the closed container 11 to the connecting pipe body 17, by inserting your hand through the hand hole and opening the gate valve 40, the gas with a heavy specific gravity is transferred. The insulating gas is replaced with air sequentially from the bottom of the connecting pipe body 17, and when it is confirmed that the insulating gas overflows from the hand hole 18, the lid of the hand hole is closed, and both the gases are replaced through the open gate valve. The gas pressure in the container equilibrates. Note that when performing disassembly and inspection, the insulating gas may be recovered using a valve provided on the side of the closed container 11. This configuration provides the advantage that gas pressure can be maintained reliably because valves and piping that are likely to cause gas leaks do not come out.

[Effect of idea]

As described above, the present invention includes a connection pipe body whose gas is separated by an insulating spacer that is airtightly attached to a closed container to be connected, and a gate valve that communicates this pipe body with one of the closed containers. With the connection sealed container filled with insulating gas, open the manhole of the connection pipe body and connect the high-voltage conductor. When the connection work is completed, open the gate valve and use the replacement method to remove excess from one of the sealed containers in advance. The structure is such that the insulating gas filled in the pipe is transferred to the connecting pipe body side. As a result, the equipment required for evacuation and gas filling is no longer required, and the only work required is to transfer the insulating gas to the connecting pipe, which has a small volume, which greatly reduces the man-hours and time required for insulation processing. Since connection members such as insulating bushings are not required, conventional problems are solved, and a low gas pressure gas insulated electric appliance can be provided that facilitates connection work at the installation site and greatly simplifies gas filling work.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main parts of a conventional gas insulated electric appliance.
Figure 2 is a schematic sectional view showing an embodiment of the present invention;
The figure is a sectional view of a main part showing a different embodiment, and FIG. 4 is a sectional view of a main part showing another embodiment. In the figure, 1, 2, 11, 12... sealed container to be connected, 4, 14... high voltage conductor, 15, 25...
Insulating spacer, 16... Connection conductor, 17... Connection pipe body, 18... Hand hole, 19, 41... Communication piping, 20, 40... Gate valve.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Electrical equipment divided into unit circuits is housed in an airtight container containing insulating gas,
In the apparatus in which each of the electrical devices is supported by an insulating spacer airtightly attached to the sealed container and connected to each other via a high voltage conductor drawn out to the side of the sealed container, the high voltage conductor is connected to both sides of the sealed container. It is surrounded by a sealable space formed by an insulating spacer and a connecting tube connecting the two insulating spacers, and the space is exposed to outside air through an openable and closable hand hole provided in the connecting tube. A gas insulated electrical appliance characterized by communicating with one closed container through a gate valve. 2. A gas insulated electrical appliance as set forth in claim 1 of the utility model registration claim, characterized in that the connecting pipe body is formed integrally with either one of the closed containers to be connected. 3. A gas insulated electrical appliance as set forth in claim 1 of the utility model registration claim, characterized in that a gate valve is disposed inside the connecting pipe body.