JPH0318405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detachable busbar device used in a gas-insulated switchgear, and more particularly to an improved detachable busbar device that can be made smaller.

In gas-insulated switchgear, major components such as chopsticks, disconnectors, disconnectors, busbars, etc. are separated by gas, but this is done in consideration of maintenance between each major component and workability during installation. It is something that is done.

For example, this type of attaching/detachable busbar is
The one shown in Publication No.-42117 is known.
It is comprised of an extensible busbar section provided with a bellows, and a removable busbar section connected to the extensible busbar section for separating the busbars to be connected to each other. This attachment/detachment busbar section is provided with a manhole for performing attachment/detachment work. The actual work of attaching and detaching busbars is as follows:
First, the conductor connection part in the detachable busbar section is separated from the manhole of the detachable busbar section, and after the case of the detachable busbar section and the conductor are supported using a tool, the drawing busbar section is expanded and contracted. The attachment/detachment work is completed by cutting out the attachment/detachment busbar portion using the space formed by this expansion/contraction.

However, when a gas insulated switchgear is specifically constructed using the detachable busbar having the above configuration, the configuration is as shown in FIG. 1. 1A is a single line diagram, FIG. 1B is a plan view of a corresponding gas insulated switchgear, FIG. 1C is a side view, and FIG. 1D is a front view. That is, in the case of a double busbar configuration, the respective busbars 1 and 2 are continuously connected via the detachable busbar 3 through the disconnectors 1a and 2a, but this detachable busbar 3 is connected to the telescopic busbar section 3a as described above. and the detachable busbar portion 3b, the overall length becomes long.
When the detachable busbar 3 becomes longer, the problem is not limited to the detachable busbar 3, but extends to the entire gas insulated switchgear. That is, since the removable busbar 3 becomes larger, the distance L1 between each busbar 1 and 2 is determined, and in accordance with this, the distance L1 between the wire breaker 4 and the through-type instrument current transformer 5-1, 5-2 connection busbar is determined. Since the length of the conduit leading to the cable head 7 via the cable 6 becomes longer, the overall length L2 becomes larger. Moreover, since the connection bus bar 6 also becomes unnecessarily long, an economic loss also occurs. How to make the removable bus bar compact is important for gas-insulated switchgear, and therefore, it is important to downsize the removable bus bar and then determine how to connect and disconnect it. This is a strong demand for downsizing and inexpensively producing switchgears.

Therefore, the present invention has been made in view of the above points, and an object of the present invention is to provide a detachable busbar device that simplifies the detachable busbar structure and achieves miniaturization, thereby making it possible to provide a gas-insulated switchgear at a low cost. It is something to do.

An embodiment of the present invention will be described below with reference to FIG. Reference numerals 10 and 11 indicate component devices connected to each other via a detachable busbar 12, and this component device 1
0 and 11 may be anything such as a bus bar or a disconnector, as long as the conductor is housed in the case. The component device 1
0 and 11 are cases 10b filled with insulating gas;
The conductors 10a, 11a are inserted into the interior of the conductor 11b, and the opposing ends are connected to the insulating spacers 10c, 11b.
It is occluded by c. This insulating spacer 10
c, 11c is installed in the cases 10b, 11c.
The outer periphery of the spacer may be secured to the flanges 10d and 11d provided at b, respectively, by tightening bolts. In addition, the insulating spacers 10c and 11c support the conductors 10a and 11a, and also connect the ends of the conductors 10a and 11a directly or to the contacts 10.
e and 11e to protrude to opposite sides. On the other hand, the detachable busbar device 12 has a detachable busbar 14 housed in a bellows 13 having flanges 12a and 12b at both ends that are abutted and joined to the flanges 10d and 11d of the cases 10b and 11b, and an insulating gas is sealed inside. One end of the detachable conductor 14 is removably connected to the contact 10e of the one component device 10 via a connecting conductor 15 and a connecting fitting 17 having a U-shaped cross section. The other end is removably connected to the contact 11e of the other component device 11 via a connecting conductor 16 having a U-shaped cross section and a connecting fitting 18. And the detachable conductor 14 of the detachable bus device 12
The length l ₁ is the component device 1 arranged opposite to each other.
The length is somewhat shorter than the distance l ₂ between the opposing flanges 10d and 11d of Nos. 0 and 11. For this reason, connection conductors 15 and 16 are arranged between the connectors 10e and 11e and the detachable bus device 12, and in particular, the connection conductors 1
5 and 16 and the ends of the detachable conductor 14 are located inside the A and B lines shown in the figure, and the A and B lines are located between the connection conductors 15 and 16. FIGS. 3a and 3b show the aforementioned connection conductor 15,
16, there are connecting fittings 1 at both ends of the connecting conductors 15 and 16.
7 and 18 and bolt holes a and b for fastening to the detachable conductor 14 are bored. Figure 4 a and b are connecting conductors 1
5 and 16, which are a front sectional view and a sectional view taken along the line 3, with a lid c attached to the one shown in FIG. 3.

With the above configuration, the component devices 10 and 11 are electrically and mechanically connected via the detachable bus device 12. Next, the operation of attaching and detaching the detachable busbar device 12 according to the present invention will be explained. From the state shown in FIG.
As shown in the figure, the bellows 13 of the detachable bus device 12
compress. In this case, the gas in the bellows 13 is recovered from a supply/discharge section (not shown) and then compressed. As a result, a space is formed between each of the above, so that the connecting portion between the connecting fittings 15, 16 and the detachable conductor 14 can be confirmed from one direction from the outside. Next, while the bellows 13 is compressed, the bellows 13 is
is moved downward as shown in FIG. Here, the bellows 13 and the removable conductor 14 disposed through the bellows 13 are mechanically connected and fixed using conductor fixing jigs 19a and 19b clearly shown in FIG. . Conductor fixing jig 19
a, 19b has a bolt hole at one end, and the other end is shaped to match the outer peripheral surface of the detachable conductor 14. The jigs 19a and 19b having such shapes are
The jigs 19a and 19b are arranged in a straight line above and below the detachable conductor 14, and the other sides of the jigs 19a and 19b are provided with tightening bolt holes 120 provided in the flange 12a, respectively.
The above-mentioned bellows 13 and detachable conductor 14 are fixed by fixing with bolts. The other side flange 12b is also fixed using similar jigs 20a and 20b. Furthermore, bellows 1
3. Compression is performed using compression jigs 22 and 23 shown in FIG.
I try to do it by wearing it.

According to this state, as shown in Fig. 6, the connecting conductor 1
The connections between the conductors 5 and 16 and the detachable conductor 14 and the connections between the conductors 15 and 16 and the connecting fittings 17 and 18 can be easily confirmed from the outside. Therefore, use the tool 21 inserted from one direction to disconnect the mutually connected parts,
By removing the connecting conductors 15 and 16, the detachable bus device 12 can be removed as shown in FIG. At this time, the connecting conductors 15 and 16 have a cross section of U.
Because of the shape, metal powder generated during removal can be retained inside the connecting conductors 15 and 16 without falling, and metal powder can be prevented from having an adverse effect on the detachable bus device 12. Incidentally, when unfastening the connection part, if a bolt treated with a locking process is used as the fastening member, loss of the bolt can be prevented. The reattachment of the detachable bus device 12 can be easily accomplished by performing the above procedure in reverse.

However, according to the present invention, the bellows has a jacket structure in which flanges are provided at both ends, and a detachable conductor having a length slightly shorter than the length of the jacket is housed within the jacket, and the detachable conductor has a length slightly shorter than the length of the jacket. Both ends of the bellows are detachably connected to the conductors of the connected device through removable connecting conductors, and the flanges at both ends of the bellows are provided on the ends of the connected device's cover such as insulating spacers. When removing the detachable busbar device, the bellows is compressed by removing the connection between the outer sheath member of the connected equipment and the outer sheath flange of the detachable busbar device. Since the connection between the detachable conductor and the connecting conductor is removed using the space between them, the detachable conductor can be easily attached and detached without rotating, etc. There is no need to configure two busbars, and the detachable busbar device can be made smaller. Therefore, if a gas insulated switchgear is constructed using the detachable busbar device of the present invention, there is an advantage that the device can be made smaller and economically manufactured. In addition, since the cross section of the connecting conductor is formed into a U-shape, the connection between the connecting conductor and the detachable conductor can be confirmed from one direction, and the removal work can be easily performed by inserting a tool for disconnecting from one direction. can be done. An example of its configuration is shown in FIGS. 9a and 9b. This figure shows the equipment configuration corresponding to the single line diagram shown in FIG. 1A. Comparing Figure 1c and Figure 9b, we find that the distance L between generatrix lines in Figure 9b is
3 and the overall length L4 are clearly reduced.

[Brief explanation of the drawing]

Figures 1 a, b, c, and d are explanatory diagrams showing an example of a conventional gas-insulated switchgear, where a is a single line diagram, b,
c and d are plan views, side views, and front views; FIG. 2 is a sectional view showing one embodiment of the present invention; FIGS. A front view, a sectional view taken along lines - and -, FIGS. 5 and 6, and FIG. 8 are explanatory diagrams showing a detached state of the detachable bus device of the present invention, and FIG. 7 is an example of a detachable conductor supporting state. FIG. 6A -A arrow view and FIG. 9 are external views showing an example of a gas insulated switchgear using the detachable busbar device of the present invention. 10, 11... Component device, 12... Detachable bus bar, 12a, 12b... Flange, 13... Bellows, 14... Detachable conductor, 15, 16... Connection conductor, 17, 18... Connecting metal fitting, 19 , 20... jig, 22, 23... bellows compression jig.

Claims (1)

[Claims] 1. A detachable conductor having a length slightly shorter than the length of the outer cover is housed in a cylindrical gas-tight outer cover having flanges at both ends of the bellows, and the detachable conductor has a length slightly shorter than that of the outer cover. The outer sheath including the bellows is connected at both ends to the conductor housed in the outer sheath of each connected equipment device connected to both flanges of the outer sheath through detachable connecting conductors. The flange of the connecting device is removably fastened to the jacket member of the connecting equipment device, and the connecting part between the two jackets is aligned with the part where the detachable connecting conductor is arranged. A detachable busbar device characterized in that the shape of the conductor is U-shaped in a cross section including the axis in the direction of the detachable conductor and in a cross section perpendicular to the axis in the direction of the detachable conductor in the central portion thereof. 2. Removal of the bellows from the outer sheath of a connected equipment device connected to the outer sheath having flanges at both ends of the bellows is performed by compressing the bellows,
The attachment/detachment busbar device according to claim 1, wherein attachment is performed by extending the bellows.