JPH09149531A - Gas insulated bus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the insulation reliability of a gas insulated bus and further the miniaturization of gas insulated buses. SOLUTION: A high-voltage conductor 2 has its core positioned higher than the central axis of a ground metal case 1. This makes it possible to increase the insulation distance from the bottom of the ground metal case 1 to the high- voltage conductor 2 where metallic foreign matter is likely to be present. This enables the improvement of the insulation reliability of gas insulated buses. If the insulation reliability remains at a conventional level, it is possible to reduce the inside diameter of the ground metal case 1, and thus further the miniaturization of gas insulated buses.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to S as an insulating medium.
Enclose an insulating gas such as F6 gas in a grounded metal container,
The present invention relates to a gas-insulated bus bar that supports and insulates a high-voltage conductor with an insulating spacer in the grounded metal container.

[0002]

2. Description of the Related Art Conventionally, gas-insulated buses have been used in substations and the like. The gas-insulated busbar is a busbar which is enclosed in a metal container in which an insulating gas is grounded as an insulating medium and in which a high-voltage conductor for energization is supported and insulated by an insulating spacer.

FIG. 6 shows an example of such a gas-insulated bus bar, and reference numeral 1 in the figure is a cylindrical grounded metal container. Insulating gas is enclosed as an insulating medium in the grounded metal container 1. SF6 gas is usually used as the insulating gas. SF6 gas is characterized by high stability, inertness, non-combustion, odorlessness, harmlessness, and a dielectric strength 2-3 times that of air.

A high-voltage conductor 2 for energization is arranged in the grounded metal container 1 on a concentric axis with the grounded metal container 1. The high-voltage conductor 2 is insulated and supported in the grounded metal container 1 by a cylindrical insulating spacer 3. The insulating spacer 3 includes an insulator 7 made of a thermosetting synthetic resin such as an epoxy resin, and the high voltage embedded electrode 5 and the low voltage embedded electrode 6 are integrally poured at both ends of the insulator 7. Formed. Such an insulating spacer 3 is provided between the high voltage conductor 2 and the ground metal container 1 such that the high voltage embedded electrode 5 is on the high voltage conductor 2 side and the low voltage embedded electrode 6 is on the ground metal container 1 side. Attached to. At this time, the insulating spacer 3 is arranged below the high-voltage conductor 2 so as to be orthogonal to the longitudinal direction of the high-voltage conductor 2.

[0005]

By the way, at the present time when the capacity of gas-insulated equipment is increasing with the increase in power demand, there is a strong demand for improvement in insulation reliability of gas-insulated busbars.
The insulation reliability of the gas-insulated busbar is determined by the insulation performance of the insulation gas and the insulation performance of the insulation spacer. Among these, the insulating performance of the insulating spacer is the insulating performance of the creeping surface against the metallic foreign matter which is considered to be present in the grounded metal container.
That is, no matter how high the insulating performance of the insulating gas in the grounded metal container is, if the creeping insulation performance of the insulating spacer is low, the insulation reliability of the gas insulated busbar will be reduced.

In order to improve the creeping insulation performance of the insulating spacer, it is effective to extend the creeping insulation distance. To extend the insulating distance means to increase the inner diameter of the grounded metal container (that is, the inner diameter of the gas insulating busbar). It is nothing but making it big. However, in recent years, where it is difficult to secure a site for construction of a substation and environmental consciousness is emphasized, further downsizing of the gas-insulated bus bar is required. Therefore, there has been a demand for a gas-insulated bus bar that has high insulation reliability and is further compact.

The present invention has been proposed in view of the above circumstances, and its main purpose is to provide a gas-insulated bus bar that improves the insulation reliability of the gas-insulated bus bar and contributes to further size reduction. To do.

Another object of the present invention is to provide a gas-insulated bus bar which reduces the mechanical strength of the insulating spacer and makes the insulating spacer compact. Further, another object of the present invention is to provide a gas-insulated bus bar which is made compact by replacing the conical insulating spacer with a cylindrical insulating spacer. Another object of the present invention is to provide a gas-insulated bus bar that simplifies the mounting structure of the insulating spacer and makes it compact.

[0009]

In order to achieve the above object, the invention of claim 1 provides a high-voltage conductor for energization in the axial direction in a cylindrical ground metal container enclosing an insulating medium. In the gas-insulated bus bar supported and insulated by the insulating spacer, the high-voltage conductor is eccentrically arranged above the central axis of the grounded metal container.

According to the gas-insulated bus bar constructed as described above, since the high-voltage conductors are arranged biased above the central axis of the grounded metal container, the ground metal having a very high probability of having foreign metal particles is present. The insulation distance from the bottom of the container to the high voltage conductor can be increased. Therefore, when the present invention has a structure having insulation reliability performance equivalent to that of the related art (that is, when securing a creeping insulation distance equivalent to that of the related art), the inner diameter of the ground metal container can be shortened, and the gas-insulated bus bar can be compact. Can be realized. Further, if the present invention has a size equivalent to the inner diameter of the conventional grounded metal container, the insulation distance can be made larger than that of the conventional example, and the insulation reliability can be improved.

According to a second aspect of the present invention, a plurality of the insulating spacers are arranged, and adjacent insulating spacers have an attachment angle of 45.
It is characterized in that it is arranged so as to be changed within a range of 120 degrees to 120 degrees.

In the gas-insulated bus bar constructed as described above, since the mounting angles of the adjacent insulating spacers are different, the mechanical force acting on the high-voltage conductor can be dispersed in several directions. it can. Particularly, when the mounting angle of the insulating spacer is 45 degrees to 120 degrees, it is suitable to disperse the acting force on the high-voltage conductor. By dispersing the acting force on the high-voltage conductor in this way, the mechanical strength of each insulating spacer can be reduced. As a result, the insulating spacer can be designed compactly.

According to a third aspect of the invention, a connection shield electrode for connecting the high voltage conductors to each other is attached to an end portion of the high voltage conductor, and the insulating spacer is attached to the connection shield electrode. .

In the gas-insulated bus bar having such a structure,
Since there is a connection shield electrode, it is possible to arrange only one insulating spacer for each ground metal container. Also, if there is no problem in gas-tightness, a conical insulating spacer can be used as a columnar shape. It becomes possible to replace it with the insulating spacer. This makes it possible to construct a more compact gas-insulated bus bar.

A fourth aspect of the present invention is characterized in that a ring-shaped connecting flange ring for connecting the grounded metal containers is provided, and the insulating spacer is attached to the connecting flange ring.

In the gas-insulated bus bar configured as described above, it is not necessary to provide a component for mounting a cylindrical insulating spacer in the grounded metal container, so that the structure of the grounded metal container is simplified and the gas-insulated bus bar is provided. Can be made more compact.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a gas-insulated bus bar according to the present invention will be described below with reference to the drawings. 1 is a sectional view of a first embodiment including claim 1, FIGS. 2 and 3 are sectional views of a second embodiment including claim 2, and FIG. 4 is a third embodiment including claim 3. A sectional view of the embodiment and FIG.
It is sectional drawing of 4th Embodiment containing. The same parts as those of the conventional example shown in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted.

[First Embodiment] ... FIG. 1 (Structure) In the first embodiment, the high-voltage conductor 2 is disposed eccentrically above the central axis of the grounded metal container 1 and has a cylindrical shape. The structural feature is that the spacers 3 are insulated and supported.

(Function and Effect) In the gas-insulated bus bar having the above-mentioned structure, the high-voltage conductor 2 is connected to the grounded metal container 1.
Since it is arranged above the central axis of the, the insulation distance from the bottom surface of the grounded metal container 1 to the high-voltage conductor 2 where the probability that metallic foreign matter is present is very high can be increased. Therefore, comparing the first embodiment with the conventional example in which the high-voltage conductor 2 is arranged on the central axis of the grounded metal container 1, when both have the same insulation reliability performance, The inner diameter of the grounded metal container 1 in the embodiment can be made shorter than the inner diameter of the grounded metal container 1 in the conventional example. Further, when the inner diameter of the grounded metal container 1 of the first embodiment and the inner diameter of the grounded metal container 1 of the conventional example are made equal, that is, when the sizes of both are made equal, the high voltage conductor is eccentric upward. In the former case, since the insulation distance can be made larger, excellent insulation reliability can be exhibited.

As described above, according to the first embodiment, the insulation reliability of the gas-insulated bus bar is improved by the extremely simple structure in which the high-voltage conductor is arranged deviated above the central axis of the grounded metal container. At the same time, it can contribute to further downsizing.

[Second Embodiment] ... FIGS. 2 and 3 (Structure) In the second embodiment, three insulating spacers 3 are arranged for the high-voltage conductor 2. More specifically, the adjacent insulating spacers 3 are arranged at equal intervals with a mounting angle of 120 degrees.

(Operation and Effect) In the gas-insulated bus bar in which the insulating spacers 3 are arranged in this manner, the three insulating spacers 3 are arranged at the same mounting angle from three directions in the high-voltage conductor 2.
Is supported, the mechanical force acting on the high-voltage conductor 2 can be divided into three equal parts. Therefore, the insulating spacer 3
The mechanical strength of can be reduced. As a result, the insulating spacer 3 can be designed compactly, and its assembly can be facilitated. In addition, the insulating spacer 3 is attached to the bottom surface of the grounded metal container 1 in which there is a high probability that metallic foreign matter is present.
Can be arranged at an angle, so that it is possible to easily improve the insulation reliability with respect to metallic foreign matter.

[Third Embodiment] ... FIG. 4 (Structure) In the third embodiment, a connection shield electrode 8 for connecting the high voltage conductors 2 to each other is provided at an end of the high voltage conductor 2.
Is installed. And this connection shield electrode 8
An insulating spacer 9 is attached to. This insulating spacer 9 has the same structure as the low voltage embedded electrode 6 except that the connection shield electrode 8 is used instead of the high voltage embedded electrode 5.
And the structure having the insulator 7 is the same as that of the insulating spacer 3.

(Function and Effect) With the gas-insulated bus bar having such a structure, sufficient supporting force can be secured by disposing one insulating spacer 9 for each grounded metal container 1. By the way, in the gas-insulated bus bar having the connection shield electrode 8, a conical insulating spacer is usually attached to the connection shield electrode 8. Since the third embodiment has the connection shield electrode 9,
If there is no problem in the gas-tight section, the conical insulating spacer can be replaced by the cylindrical insulating spacer 9. That is, according to the third embodiment, by changing the conical insulating spacer to a cylindrical insulating spacer, a more compact gas insulating busbar is configured as compared with a gas insulating busbar having a conical insulating spacer. can do.

[Fourth Embodiment] FIG. 5 (Structure) In the fourth embodiment, a ring-shaped connection flange ring 10 for connecting the ground metal containers 1 to each other is provided. An insulating spacer 3 is attached to the inner circumference of the connecting flange ring 10.

(Function and Effect) In the gas-insulated bus bar having such a structure, the insulating spacer 3 is attached to the connecting flange ring 10 in advance, so that a member for attaching the insulating spacer 3 to the grounded metal container 1 is provided. There is no need to install it. Therefore, the structure of the grounded metal container 1 can be simplified, and as a result, the gas-insulated busbar can be made compact. Further, the mounting angle of the insulating spacer 3 can be easily changed only by changing the mounting angle of the connecting flange ring 10 when mounting the connecting flange ring 10 to the grounded metal container 1. Therefore, the grounded metal container 1 is highly likely to contain foreign metal.
It is possible to dispose the insulating spacers 3 at an angle with respect to the bottom surface of the. As a result, it is possible to improve insulation reliability against foreign metal.

[Other Embodiments] In all of the above embodiments, the case where the present invention is applied to a single phase has been described. However, it is needless to say that the same effect can be obtained even if the present invention is applied to a three-phase bus. Is. Further, although the mounting angles of the three insulating spacers are 120 degrees in the second embodiment, the mounting angles of the respective insulating spacers can be appropriately changed within the range of 45 degrees to 120 degrees.

[0028]

As described above, according to the present invention,
By constructing the grounded metal container and the high-voltage conductor in an eccentric manner, it is possible to provide a gas-insulated bus bar that is more compact than the conventional one and has improved insulation reliability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is a sectional view of a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a configuration example of a conventional gas-insulated bus bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ground metal container 2 ... High voltage conductor 3, 9 ... Insulating spacer 4 ... Insulating gas 5 ... High voltage embedded electrode 6 ... Low voltage embedded electrode 7 ... Insulator 8 ... Connection shield electrode 10 ... Connection flange ring

Claims (4)

[Claims] 1. A gas-insulated busbar in which a high-voltage conductor for energization is supported and insulated by an insulating spacer in an axial direction in a cylindrical grounding metal container enclosing an insulating medium, wherein the high-voltage conductor is grounded. A gas-insulated bus bar arranged eccentrically above a central axis of a metal container. 2. The gas-insulated bus bar according to claim 1, wherein a plurality of the insulating spacers are arranged, and the mounting angles of the adjacent insulating spacers are changed within a range of 45 degrees to 120 degrees. 3. A connection shield electrode for connecting the high voltage conductors to each other is attached to an end portion of the high voltage conductor, and the insulating spacer is attached to the connection shield electrode. Gas-insulated bus bar as described. 4. A ring-shaped connecting flange ring for connecting the grounded metal containers to each other, and the insulating spacer is attached to the connecting flange ring. Gas insulated busbar.