JPH0130829Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a detachable busbar used in a gas-insulated switchgear.

[Technical background of the invention] Recently, with the demand for larger capacity and smaller size of electric station equipment such as substations, it has become necessary to increase Gas-insulated switchgear is used, which is housed in a metal container filled with an insulating gas such as SF ₆ gas. After assembling this kind of gas-insulated switchgear on-site, each device is tested for withstand voltage, but in that case, it is necessary to disconnect lightning arresters and other devices from the circuit to prevent overvoltage from being applied. Therefore, at locations where there are devices to be disconnected from such circuits, detachable busbars are provided that allow the internal conductors to be removed. The gap between the poles of the detachable bus bar from which the conductor has been removed needs to have a structure that can withstand not only the on-site test voltage but also lightning impulses.

Figures 1 and 2 show the structure of a conventionally known detachable busbar. Figure 1 shows the conductor connected, and Figure 2 shows the circuit disconnected. It shows. This detachable busbar is connected to insulating spacers 2a and 2 at both ends of the metal container 1.
conductor support parts 3a and 3b are respectively provided on b, and cylindrical removable conductors 5a and 5b are respectively fitted into the opposing tip portions of the conductor support parts 3a and 3b via sliding contacts 4a and 4b. , these detachable conductors 5
The tips of a and 5b are fixed with bolts via a connecting conductor 6.

When removing the internal conductor from this attachment/detachment bus, open the lid of the conductor outlet 7 provided at the top of the metal container 1, insert a jig through the outlet 7, remove the bolt, and remove the connecting conductor 6. After that, the first and second removable conductors 5a and 5b are moved toward the center by the distance from which the connecting conductor 6 was removed, and the conductor support portion 3 is moved.
Pull it out from a and 3b. Thereafter, as shown in FIG. 2, end conductors 8a and 8b are inserted into the outside of the first and second conductor support parts 3a and 3b instead of the detachable conductors 5a and 5b. These end conductors 8a, 8b
The tip has an arcuate surface that can soften the electric field so that it can withstand field test voltages and lightning impulses.

[Problems in the Background Art] As described above, the conventional detachable busbar is difficult to connect to the detachable conductors 5a and 5b and the connecting conductor 6 when connecting a normal circuit.
In addition, end conductors 8a, 8 for on-site withstand voltage tests
The disadvantage is that the number of component parts is large. Furthermore, in the case of conventional detachable busbars, work is required to pull out the detachable conductors 5a, 5b from the conductor supports 3a, 3b or to fit the end conductors 8a, 8b when disconnecting the circuit. This work is performed by sliding the sliding contacts 4a and 4b provided inside each conductor.
The contact force required to conduct current is considerable, and a force of 10 to 20 kg is required to remove the conductor.
However, the work requiring such force had to be performed through the conductor outlet, which is a relatively narrow opening provided in the metal container 1, making the work extremely difficult.

[Purpose of the invention] The invention was proposed in order to eliminate the problems of the above-mentioned conventional technology.The purpose is to eliminate the need for special parts such as end conductors for on-site withstand voltage tests,
Moreover, it is an object of the present invention to provide a detachable bus bar that allows easy disconnection of a circuit without having to attach or detach a conductor provided with a sliding contact.

[Summary of the invention] The detachable busbar of the present invention has a shape of the tips of the first and second detachable conductors supported at both ends of the metal container.
It has an arc-shaped circumferential surface that relaxes the electric field so that it can withstand on-site test voltages and lightning impulses, and the tips of such detachable conductors are connected by a connecting conductor, so that when the circuit is disconnected, When the connecting conductor is removed, the first and second removable conductors continue to function as conventional end conductors to alleviate the electric field.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIGS. 3 and 4.

In this embodiment, first and second removable conductors 15a and 15b are attached to the tip sides of conductor support parts 3a and 3b provided at both ends of the metal container 1, respectively. The removable conductors 15a, 15b are attached by fitting their cylindrical base ends into the tips of the conductor supports 3a, 3b via sliding contacts 4a, 4b. On the other hand, these detachable conductors 15
The circumferential surfaces of the tip portions of a and 15b are formed in an arcuate shape that can alleviate the electric field so as to withstand on-site test voltages and lightning impulses, similar to the tip portions of conventional end conductors.

A connecting conductor 16 connects the ends of the first and second detachable conductors 15a and 15b. This connecting conductor 16 includes a cylindrical body 17 and
It is comprised of end plates 18 provided at both ends of the body 17 and in contact with the front end surfaces of the detachable conductors 15a, 15b. Also, this torso 1
The upper surface of 7 has an opening 19 as shown in the sectional view in FIG.
The opening 19 is covered by an arcuate cover plate 20 having the same curvature as the body 17. The ends of this connecting conductor and the first and second removable conductors are tightened and fixed by bolts 21 inserted from inside the end plate 18 of the connecting conductor. This bolt 21 is inserted through an opening 19 provided in the upper part of the body 17 of the connecting conductor, and this opening 19 is closed by a cover plate 20 after the bolt is tightened. The lid plate that closes the opening 19 is fastened and fixed by bolts 22 provided between the upper edge of the end plate 18 and the lid plate 20.

In the detachable busbar of this embodiment having such a configuration, when disconnecting the circuit, open the conductor outlet 7 at the top of the metal container 1, insert a jig from that part, and remove the bolt 22 to disconnect the connecting conductor. 1
Open the cover plate 20 of 6. Next, insert a jig into the opening 19 of the connecting conductor, remove the bolt 21, and connect the connecting conductor 16 to the first and second removable conductors 15a,
Remove from 15b. In this way, metal container 1
Sufficient insulating space is secured between each of the removable conductors 15a and 15b left in the interior, which is sufficient to break the circuit.
15b has an arcuate tip and a shape that relaxes the electric field, so even if a test voltage or lightning impulse is applied between the poles of the detachable conductor, there is no fear that the insulation in this part will be destroyed. . Furthermore, in this embodiment, since the central connecting conductor is constituted by a cylindrical member having a cover plate 20, the electric field in this connecting conductor portion is relaxed when the conductors shown in FIG. 3 are connected. It has the advantage of In addition, since the support shaft of each conductor is supported by the insulating spacers 2a and 2b for gas division, only the inside of this attachment/detachment bus bar is one gas division, and when disconnecting the circuit, it is possible to Since there is no need to remove the gas, there is also the advantage that the range of gas recovery can be minimized.

In addition, each removable conductor 15a, 15b is a sliding contact 4.
the first and second conductor support parts 3 via a and 4b
a, 3b, so there is no particular problem when the detachable conductor is placed horizontally, but if the detachable conductor 15a, 15b is placed perpendicular to the ground, or Even if they are arranged horizontally, if the weight of the removable conductors 15a, 15b is extremely large, there is a risk that the removable conductors may fall off from the conductor support portion. Therefore, in such a case, as shown in FIG.
It is possible to prevent detachable conductors 15a, 15b from falling off by forming a bolt insertion hole 23 at the tip of each conductor a, 15b, and screwing a stud 24 inserted therethrough into the conductor support portions 3a, 3b. .

Next, FIGS. 6 and 7 show a second embodiment of the present invention. In this second embodiment, the central connecting conductor 26 is made of a cylindrical shape like the first embodiment. Instead of a member, a member having several recesses 27 (four in the drawing) for attaching bolts 21 formed on its surface is used. In this embodiment, the electric field at the connection conductor 26 portion is relaxed by the recess 27.
This is done on the uncut portion of the conductor surface. In this second embodiment, the cover plate of the first embodiment is unnecessary, the cover plate and the bolts 22 for fixing it can be omitted, and the number of parts can be reduced and each member used when disconnecting the circuit. Another advantage is that the removal work is simplified.

The attachment/detachment busbar shown in FIG. 8 is a third embodiment of the present invention, in which a telescopic container 30 is provided on the body of the metal container 1 and extends along the axial direction of the metal container 1. In this third embodiment, after removing the central connecting conductor, the first and second detachable conductors 15a,
15b from the conductor supports 3a, 3b and further contracting the expandable container 30, it becomes possible to remove the entire detachable bus bar from the conduit of the gas insulated switchgear. This makes it possible not only to disconnect the circuit, but also to easily adjust the dimensions when assembling the gas insulated switchgear and disassemble the device.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, in addition to the single-phase bus bar as shown in the figure,
It is also applicable to a three-phase collective bus bar in which conductors for three phases are housed in one metal container.

[Effect of the invention] As mentioned above, in this invention, the first and second
The tip of the attachable/detachable conductor has an arc-shaped circumferential surface that can alleviate the electric field, and the structure is designed to withstand on-site test voltages and lightning impulses, so there is no need to prepare a separate end conductor like in the past. Since there is no need to replace it, there is an effect that the work of disconnecting the circuit becomes extremely simple. In particular, since there is no need to attach or detach the conductor from the sliding contact portion, there is no need to apply a large amount of force to attach or detach the conductor from the narrow conductor outlet, so the work efficiency is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the circuit connection state of the conventional detachable bus bar, Fig. 2 is a sectional view showing the disconnected state of the circuit of the detachable bus bar of Fig. 1, and Fig. 3 is a sectional view showing the circuit connection state of the detachable bus bar of the present invention. 4 is a sectional view of the connecting conductor portion in FIG. 3; FIG. 5 is a sectional view showing the disconnected state of the connection busbar in FIG. 3;
Fig. 6 is a cross-sectional view showing the connection state of the detachable bus bar according to the second embodiment of the present invention, Fig. 7 is a cross-sectional view of the connecting conductor in the connection bus bar of Fig. 6, and Fig. 8 is a combination of a metal container and a retractable container. FIG. 3 is a sectional view showing a third embodiment of the present invention. 1...Metal container, 2a, 2b...Insulating spacer, 3a, 3b...Conductor support part, 4a, 4b...
Sliding contact, 5a, 5b... Detachable conductor, 6... Connecting conductor, 7... Conductor outlet, 8a, 8b... End conductor, 16... Connecting conductor, 17... Body, 18
... End plate, 19 ... Opening, 20 ... Lid plate, 2
1, 22... Bolt, 23... Insertion hole, 24...
Stud, 26... Connection conductor, 27... Recess, 3
0...Extensible container.

Claims (1)

[Claims for Utility Model Registration] (1) A conductor outlet is provided in the body of a metal container filled with insulating gas, conductor support portions are provided at both ends of the metal container, and a first conductor support portion is provided at each end of the metal container. and a detachable bus bar, in which a second detachable conductor is attached to its tips with a constant interval maintained, and the opposing tips of the first and second detachable conductors are connected by a connecting conductor, A detachable bus bar characterized in that opposing tip portions of the first and second detachable conductors are shaped to have arcuate circumferential surfaces capable of relaxing an electric field. (2) At least one of the first and second detachable conductors is slidably supported along the axial direction of the conductor via a sliding contact with respect to the conductor support part. Detachable busbar as described in section. (3) The removable busbar according to claim 1 or 2, wherein the removable conductor is fixed to the conductor support part by a stud after the connecting conductor is removed. (4) Utility model registration claims Paragraphs 1 and 2, in which the metal container has a retractable container as part of it.
or the detachable busbar according to paragraph 3. (5) The removable busbar according to claim 1, wherein the metal container houses removable conductors for three phases and a connecting conductor.