JPS6216728Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a closed type switchgear, and more particularly to a closed type switchgear in which an insulating medium path is formed in an insulating spacer between mutually connected devices.

As a conventional closed type switchgear, for example, Fig. 1a,
As shown in b, it is composed of a cable connection device 1, a busbar 2, a disconnector 3, and a disconnector 4, and each of these devices 1 to 4 is housed in a sealed container together with an insulating medium such as SF ₆ gas, Some devices are electrically connected to each other. A gas insulated switchgear having such a structure is divided into several gas categories for assembly and operational reasons. In this case, the gas classification is done by taking into account the gas pressure management style, inspection, transportation, expansion, and accidents during operation, and is divided into equipment units to minimize the scope of substation shutdown work as much as possible. .

For this purpose, as shown in FIG. 1, a gas pipe 5 is installed around the outer periphery of the sealed container, and each sealed container is communicated with by a branch pipe, and a fixed valve 6 and a variable valve 7 are arranged at predetermined portions of the gas pipe 5. ing.

The gas pipe 5 is connected between the bolts 11 and nuts 12 that integrally fasten the insulating spacer 10 between the flanges 8a and 8b of the closed containers 8 and 9, that is, as shown in FIGS. 2a and 2b, for example. A support 13 is fixed to the gas pipe 5 by this support 13.
I try to support.

However, with such a configuration, the joints connecting the gas pipes 5, the valves 6, 7, etc. The mechanical strength of the connecting portion of the gas pipe 5 and the support 13 of the gas pipe 5 was greatly reduced, and there was a risk of gas leakage.
Furthermore, the gas pipe 5 is connected to a closed container 8 by means of a support 13.
Since the gas insulated switchgear is supported at a certain distance from the gas insulated switchgear 9, it naturally leads to an expansion of the space, which contradicts the basic concept of the gas insulated switchgear, which aims for further miniaturization. Furthermore, there is a high risk of damage during transportation, installation, operation, and maintenance, placing a heavy burden on each worker.Furthermore, when installed in a cold region, gas pipes 5 may be damaged due to accumulation of snow during snowfall. There is a risk of damage.

This idea was devised in view of these circumstances, and was designed to create a hermetic seal that allows only the relevant part to be disconnected without degrading gas management performance and without affecting healthy parts in the event of a failure. The purpose is to provide a type opening/closing device.

An embodiment of this invention will be described below with reference to the drawings _.
This will be explained using a gas insulated switchgear as an example. FIG. 3 is a front view showing the connection between devices in the same gas system of this device, and FIG. 4 is the - line in FIG. 3, and FIGS.
It is a figure cut along the line and - line and seen in the arrow direction. As is clear from the figure, insulating spacer 2
Two gas passages 22 and 23 are formed in the plate surface direction (thickness direction) of the insulating spacer 21 at the root portions of the flanges 8a and 9a, and these gas passages 22 and 23 communicate with each other. A connecting road 24 is formed. A thread 22a is formed on the inner peripheral surface of one open end side of the gas passage 22 (the side with the flange 9), and a plug bolt 25 having a thread formed on the outer peripheral surface is screwed into this screw 22a. ing. Further, a thread 23a is formed on the inner circumferential surface of the other open end side of the other gas passage 23 (the side with the flange 8), and a plug bolt 26 is formed on the outer circumferential surface of the thread 23a. are screwed together. Gas pipe valves 27 and 28 are provided at the other open end side of the gas pipe 22 (the side that does not have the plug bolt 25) and on the one open end side of the gas pipe 23 (the side that does not have the plug bolt 26), respectively. is provided. These gas path valves 27 and 28 both have a cavity 27a,
Valve parts 27b and 28b having 28a and stick parts 27c and 28c are integrally formed, and the stick parts 27c and 28c each have a flange 8a.
a, 9a. Springs 29 and 30 are provided between the valve portion 27b of the gas pipe valve 27 and the plug bolt 25, and between the valve portion 28b of the gas pipe valve 28 and the plug bolt 26, respectively. The stay portions 27c, 28c of the gas pipe valves 27, 28 are always connected to the flanges 8a,
It is designed to be pressed in the direction 9a. A packing 31 is provided at the joint between the insulating spacer 21 and the flanges 8a and 9a, and is insulated from the joint between the plug bolts 25 and 26 and the insulating spacer 21 and the valve parts 27b and 28b of the gas pipe valves 27 and 28. Packings 32 and 33 are provided at the joints with the spacer 21, respectively. Note that the flanges 8a, 9a and the insulating spacer 21 are connected by bolts 34.
and is tightened by a nut 35.

In such a configuration, as shown in FIG. 4a, the flanges 8a and 9a of the equipment on both sides sandwiching the insulating spacer 21 are normally equipped with the stick portions 28a and 28a of the gas pipe valves 28 and 29, respectively.
29a is pressed by the spring force of springs 29, 30, and is therefore in communication with the gas passages 22, 23 via the connecting passage 24. In this case, the plug bolt 25,2
Packing 32 is provided at the joint between 6 and the insulating spacer 21, so from this part
_SF6 gas will not leak.

If some kind of failure occurs and it is necessary to disconnect the equipment, remove the nut 35 from the bolt 34 and remove the sealed container (e.g. 8) on the failure side, and the stay part 28c of the gas pipe valve 28 can be removed. becomes free. Therefore, the gas line valve 28
Due to the spring force of the spring 30, the gas passage valve 28 rapidly moves to the left in FIG.
Gas path 23 is blocked. Through this, connecting road 2
One side of 4 is closed, and the SF ₆ gas in the sealed container (for example 9) on the healthy side is hardly vented.

In the example described above, the airtight container 8 is removed, but when the airtight container 9 is removed, the gas passage valve 27 is closed by the spring 22. In this case, packings 32 and 33 are provided at the junction between the gas passage valve 27 and the insulating spacer 21 and between the gas passage valve 28 and the insulation spacer 21, respectively, and the gas passage valves 27 and 28 are provided with springs 29 and 33, respectively.
Since the SF 6 gas is strongly pressed against the insulating spacer 21 by the insulating spacer 21, the SF ₆ gas will not leak into the closed container 8 or 9 from this part.

In this way, the gas paths 22, 2 are connected to the insulating spacer 21.
3 and a connecting path 24 connecting these two gas paths 22, 23, and gas path valves 27, 28 are provided in the gas paths 22, 23, respectively, in opposite directions, so that conventionally, the outer periphery of the closed container 8, 9 There is no need to provide gas pipes 5 except for most of the gas pipes 5 provided, that is, the gas pipes 5 on the outer periphery of the cable connection device 1. Therefore, even if vibration occurs due to an earthquake or the opening/closing operation of the disconnector 4 and disconnector 3, there is less possibility of gas leakage, improving reliability, eliminating the need for space expansion, and making it easier to transport each device 1 to 4. There is no damage to the gas pipe during installation, operation, or maintenance, and problems such as damage to the gas pipe 5 due to snow accumulation do not occur. Further, since piping work for installing the gas pipe 5 is not required, equipment costs and material costs can be reduced. Further, since the gas passages 27 and 28 are provided with plug bolts 25 and 26, workability during assembly and maintenance of the equipment is improved.

According to this invention described above, there is no problem in managing the insulating medium, and there is no need for an external insulating medium pipe.
It is possible to provide a closed type switchgear with improved reliability and reduced equipment costs.

[Brief explanation of the drawing]

Figures 1a and b are a top view and a front view of a conventional gas insulated switchgear, Figures 2a and b are a front view and a partially sectional side view showing the gas pipe support structure of Figure 1, Figure 3 is a front view showing only the main parts of an embodiment of the closed type switchgear according to this invention;
Figures a and b are cross-sectional views taken along the - line in Figure 3 and viewed in the direction of the arrow, and an enlarged view of the gas pipe valve, and Figure 5 is a cross-sectional view taken along the - line in Figure 3 and viewed in the direction of the arrow. 6 is a sectional view taken along the - line in FIG. 3 and viewed in the direction of the arrow. 1...Bus bar connection device, 2...Bus bar, 3...Disconnector, 4
...Shield disconnector, 8, 9...Airtight container, 8a, 9a...Flange, 21...Insulating spacer, 22, 23...Gas path, 22a, 23a...Screw, 24...Connecting path, 2
5, 26... Plug bolt, 27... Cavity 27a, valve part 2
7b, gas pipe valve having a stake part 27c, 28...gas pipe valve having a cavity 28a, valve part 28b, and stick part 28c, 29, 30...spring, 31, 32, 33...packing, 34...bolt, 35...nut .

Claims (1)

[Scope of utility model registration request] In a closed type switchgear in which an insulating spacer is provided between sealed containers of electrical equipment that are connected to each other and each of which is filled with an insulating medium, and a live part of the electrical equipment is supported by the insulating spacer, the insulating spacer is An insulating medium path is formed that communicates between the adjacent closed containers, the insulating medium path is always kept open, and when the closed container is removed, the insulating medium path is closed by the restoring force of a spring. A closed type switching device comprising a valve provided in the insulating medium path.