JPS6114727B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated busbar device used as a part of a gas insulated switchgear and a method for assembling the same.

Insulating spacers, which are generally applied to the busbars of gas-insulated switchgear, are used to protect the gas division of high-pressure SF ₆ gas that is mainly insulated inside the tank, as well as for earthquake resistance and electromagnetic mechanical force caused by short-term large currents in the event of an accident. There are two types of insulating spacers (these are called segmented spacers) that support conductors with consideration given to earthquake resistance and electromagnetic mechanical forces caused by short-term large currents in the event of an accident. (referred to as a spacer).

FIG. 1 shows an example of a three-phase bus when only the former segmented spacer is applied. This involves attaching segmented spacers 2 or 3 to both ends of the tank 1 and a single-phase segmented spacer 4 to the branch, and connecting the contacts 5 and conductor 6 provided on the segmented spacers 2, 3, and 4 to the conductor 6 or the branch. A certain conductor 7 is brought into contact with a finger 8 having a spring so as to be energized, and three tanks 1 are connected in series to form a set of three-phase busbars. Also, since high-pressure SF ₆ gas is sealed inside the tank 1 mainly to maintain insulation between each electrode, an O-ring 9 is inserted between the tank 1 and the segmented spacers 2, 3, and 4. In the three-phase busbar configured in this way, the segmented spacers 2 that come at both ends after connection function as gas segments and support the conductors.
Since the segmented spacer 3 sandwiched between the tank 1 and the connection is used only to support the conductor, no gas segment is required, so a through hole 10 is provided in the spacer.
It is used by setting up. In FIG. 2, which uses a post-type spacer that was considered prior to the present invention, the segmented spacer 3 in FIG. tank 1 is no longer needed,
One tank 12 may be sufficient, and the conductors 6 and 7 may also be one branched conductor 13. Therefore, the number of parts is reduced and the bus bar length is shortened, so that costs can be reduced. In this way, the post-shaped spacer 11
It can be seen that there are sufficient advantages if applied. Third
The figure shows an example of a general method of fixing a post-shaped spacer when a post-shaped spacer is applied.
The post-shaped spacer 11 is fixed with a bolt 15 to a ring-shaped conductor receiver 14 that receives the conductor 13, and the other side is fixed to a flange 16 provided on the tank 12.
It is fixed with screws 17. Further, in order to prevent partial discharge caused by electrically floating the conductor receiver 14, a contact 18 having a spring is provided inside the conductor receiver 14.
is provided and is in complete contact with the conductor 13.

The problem with such a fixed structure is that
It is difficult to determine an accurate position due to welding distortion during welding of the tank 12, and it is difficult to ensure a dimensionally exact mounting position. In particular, if you forcefully assemble items that do not match in size, troubles such as the spacer cracking or not being completely tightened are likely to occur, which may cause the spacer to come loose later.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas-insulated busbar device that is economical and easy to assemble by using a combination of segmented spacers and post-shaped spacers as insulating spacers that support busbar conductors.

Another object of the present invention is to use a combination of a segmental spacer and a post-type spacer as an insulating spacer supporting the bus conductor, so that the installation position of the bus conductor with respect to the bus tank can be easily determined, and the entire assembly can be easily performed. The present invention provides a method for assembling a gas insulated busbar device.

The present invention will be described below with reference to embodiments shown in the drawings.

First, in FIG. 4, bus conductors 22, 22, 22 for three phases are housed in a bus tank 19, and the surrounding area is insulated from the ground with SF ₆ gas to form a gas insulated bus device. Both ends of each conductor 22 are supported by segmented spacers 2, 2 having a gas sealing function, and the conductor 5 and conductor 22 are connected by a finger 8 and guided to the outside. Also, the branch conductor 30 of each conductor 22 is connected to the conductor 2 of the segmented spacer 4 at the branch part.
7 and is connected via finger 8.

In the present invention, each phase conductor 22, 22, 22
A post-shaped spacer 31 is used for insulating support in the axial direction. This post-shaped spacer 31 is the fifth
As shown in the figure, it consists of a support insulator 11 and a conductor receiver 20 that supports a conductor 22. The conductor receiver 20 and support insulator 11 are tightened with bolts 21, and the other end of the insulator 11 is attached to a mounting bracket 24. It will be done. Further, the conductor receiver 20 has a contact 18 having a spring.
is provided to completely electrically connect the conductor 22 and the conductor receiver 20. Each post spacer 31 supporting each conductor 22 is configured in an inverted dogleg shape as shown in the figure to improve earthquake resistance.

In the present invention, before assembly into the tank 19, first fix the post-shaped spacer 31 and the ring-shaped conductor receiver 20 to which the post-shaped spacer 31 is attached in a dogleg shape (or a reverse dogleg shape) with bolts 21, and then A conductor 22 with branches shortened to such an extent that the branch parts of the conductor are not caught when assembled into a tank 19 is passed through the ring of the receiver 20. This conductor receiver 20 has a built-in contact 18 having a spring in order to make complete electrical contact with the branched conductor 22. This assembly is performed for three phases.

Next, the branched conductor 22 is positioned using the positioning jig 23, and the other side of the post-shaped spacer 31 is fixed to the mounting hardware 24. With this assembly, two of the four supporting points were fixed. The remaining two points are connected and fixed by the connecting plate 25, and the positioning of the post-shaped spacer 31 and the branched conductor 22 is completed to the point where the branched conductor 22 can be moved only in the axial direction. Since these assemblies assemble parts with accurate dimensions, they are easily assembled without undue stress on each part. Further, the mounting hardware 24 has a fixing hole for fixing it to the tank 19.

This hole is a receiving seat 26 that is attached to the tank 19.
Tank 19
Make the hole a little larger considering the quality of the finish. When storing the pre-assembled gas 22 in the tank 19 as shown in FIG. Mounting hardware 24
and the hole in the receiving seat 26 of the tank 19, and tighten and fix with bolts. Thereafter, the connecting plate 25 and the positioning jig 23 are removed, and the conductor 27 is inserted through the finger 8 having a spring at the branch part. Finally, O-rings 9 are inserted between both ends and branch portions of the tank 19, and the segmented spacers 2 and 4 are tightened. Further, in the above configuration, the connection plate 25 may be left attached without being removed.

As described above, according to the present invention, earthquake resistance is improved because each phase conductor is supported by a post-shaped spacer in a dogleg shape or an inverted dogwood shape, and the overall configuration is improved because segmental spacers are used only at both ends. It becomes cheaper in terms of cost. Further, according to the present invention, by pre-assembling each phase conductor using a positioning jig before inserting it into the bus tank, each part can be assembled without difficulty, and the whole can be easily assembled.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional busbar device, Fig. 2 is a block diagram of one made prior to the present invention, and Fig. 3 is a block diagram showing a conventional busbar device.
Figure 4 is a configuration diagram showing a conductor supported state using a post-type spacer, Figure 4 is a configuration diagram showing a gas insulated busbar device according to the present invention, and Figure 5 is a configuration diagram showing a conductor supported state using a post-type spacer according to the present invention. FIG. 6 is a diagram showing a pre-assembled state of conductors according to the assembly method of the present invention. 1... Tank, 2, 3... Three-phase segmented spacer, 4... Single-phase segmented spacer, 5... Contact,
6... Conductor, 7... Conductor with branches, 8... Finger, 9... O ring, 10... Through hole, 11
... Support insulator, 12 ... Tank, 13 ... Conductor with branch, 14 ... Conductor receiver, 15 ... Bolt, 16 ... Flange, 17 ... Screw, 18 ...
Contact, 19...Tank, 20...Conductor receiver, 21
...Volt, 22... Conductor with branches, 23...
Positioning jig, 24...Mounting hardware, 25...Connection plate, 26...Socket, 27...Conductor, 31...
Post-shaped spacer.

Claims (1)

[Scope of Claims] 1. In a device in which a plurality of conductors are arranged in a busbar tank and insulation to the ground is secured around the conductors with an insulating gas, both ends of each conductor in the busbar tank are divided into sections having a gas sealing function. Gas insulation characterized by being supported by a square insulating spacer, each vertex of which is fixed to the inner wall of the busbar tank in the middle of the axial direction, and supported by a square post-shaped spacer whose one side is a doglegged or inverted doglegged spacer. Busbar device. 2. The post-shaped spacer is made up of a combination of a conductor support that supports the conductor and supporting insulators continuous on both sides thereof, and the conductor support is provided with a compression spring that makes electrical contact with the conductor. gas insulated busbar equipment. 3. When multiple conductors are placed in a bus tank and the surroundings are sealed with insulating gas to ensure ground insulation, use a positioning jig to position each conductor in relation to each other along one side. A method for assembling a gas insulated busbar device, characterized in that it is pre-assembled with a square post-shaped spacer composed of a letter-shaped or inverted-dog-shaped spacer, and is inserted into a busbar tank to fix the post-shaped spacer to the inner wall of the tank. 4. The method for assembling a gas insulated bus device according to claim 3, wherein the positioning jig to be pre-assembled with the bus conductor comprises a rod extending in the axial direction of the conductor and end plates supporting both ends.