JP2009159757A - Conductor for gas-insulating bus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductor for a gas-insulating bus which conductor has a configuration and a shape that suppress displacement caused by the electromagnetic force of shirt-circuit current and resonation caused by earthquake vibrations to improve mechanical strength and exert fine insulating performance and current-passing performance, thus contributes to an increase in the length and a decrease in the diameter of the gas-insulating bus. <P>SOLUTION: The conductor 41A is composed of a central member 41a of a solid shape and both end members 4b and 4c of a pipe shape. The central member 41a is made of a copper material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas insulated bus conductor provided in a sealed metal container filled with an insulating gas, and more particularly to a gas insulated bus conductor suitable for lengthening and reducing the diameter.

  In recent years, gas-insulated buses have become mainstream as buses for connecting power facilities. The gas-insulated bus is configured by housing a current-carrying conductor in a sealed metal container filled with an insulating gas. The length of the gas insulated bus is proportional to the scale of the power facility, and the gas insulated bus becomes longer as the scale of the power facility increases. At this time, along with the lengthening of the gas insulated bus, not only the metal container but also the gas insulated bus conductor accommodated therein becomes longer.

  However, it is impossible to form the metal container and the conductor as a single unit over such a length that the power facilities are connected to each other. Therefore, the metal container and the conductor are configured by dividing into a plurality of pieces and connecting them continuously (for example, see Patent Document 1). The metal container used for the gas-insulated bus is basically composed of a cylindrical main body, and a flange for connection with an adjacent device is integrally formed at both ends thereof by welding.

  The conductor is usually made of a hollow pipe-like member and is supported in a metal container by a support insulator. Further, as a gas-insulated bus, a single-phase gas-insulated bus of three phases has been conventionally used. Recently, a three-phase conductor has been used to reduce the installation space of the entire gas-insulated bus. A three-phase collective gas-insulated bus is widely used.

  Here, a conventional example of a gas-insulated bus having a coaxial cylindrical structure in a power system will be specifically described with reference to FIG. That is, as shown in FIG. 15, the inside of a coaxial cylindrical metal container 1 sealed with a ground potential is filled with an insulating gas 6 as an insulating medium at a high pressure. Insulating spacers 2a and 2b are provided at both ends of the metal container 1, and contacts 3a and 3b for energization are provided in these insulating spacers 2a and 2b.

  In addition, a conductive conductor 4 is disposed in the metal container 1. The conductor 4 is composed of a pipe-like member, and a single material such as aluminum or copper is used. In addition, slide contacts 5a and 5b are provided at both ends of the conductor 4, and are electrically connected to the contacts 3a and 3b of the insulating spacers 2a and 2b. In addition, the code | symbol L in a figure has shown the support span of the conductor 4. FIG.

  By the way, the gas-insulated bus conductor needs to have mechanical strength, insulation performance, and energization performance. Among these, regarding the mechanical strength, when an electromagnetic force acts between the conductors of other phases due to a short-circuit current at the time of a short circuit, the displacement due to the electromagnetic force causes a strength that does not cause the conductor to be destroyed, and further due to earthquake vibration. The strength that does not resonate is required.

In addition, regarding the insulation performance, it is required that the conductor surface is smooth and can withstand the application of a high voltage, and that the insulation performance is maintained even when the conductor surface is displaced by electromagnetic force. Furthermore, with regard to the energization performance, it is required that the amount of heat generated by the energization current and the temperature rise value are not more than specified values.
Japanese Patent No. 3564182

  However, when the conventional gas insulated bus conductor is lengthened in accordance with the lengthening of the gas insulated bus, there are the following problems. That is, if the electromagnetic force due to the short-circuit current at the time of short-circuiting increases due to the lengthening of the conductor, there is a possibility that the mechanical strength of the conductor is insufficient and breaks. In addition, when the conductor length is increased, the natural frequency is decreased, so that there is a problem that resonance is easily caused by earthquake vibration.

  Even if the conductor does not break down, the amount of displacement increases due to electromagnetic force, so that the conductor approaches the inner periphery of the metal container and the insulation distance decreases. Thereby, there exists a possibility that the insulation performance of a conductor may run short. In particular, the increase in displacement due to electromagnetic force has a problem in securing the insulation performance of the conductor because the degree of decrease in the insulation distance increases when the diameter of the gas insulated bus (more specifically, the metal container) is reduced. .

  Furthermore, if the diameter of the gas-insulated bus is reduced, the heat capacity decreases, so that the temperature rise value increases even if the amount of heat generated by the energizing current is the same. Therefore, there is a problem that the current-carrying performance of the conductor is insufficient. Since the reduction of the diameter of the gas insulated bus is an important factor in realizing the compactness of the power equipment, development of a gas insulated bus conductor having excellent insulation performance and energization performance has been awaited.

In general, when the mechanical strength of a conductor is increased, a predetermined current-carrying performance must be ensured instead of simply using a material having a high strength. For this reason, it is conceivable to increase the mechanical strength of the conductor by using an aluminum material or a copper material having good conductivity. However, copper is heavier and more expensive than aluminum because of its better electrical conductivity and current-carrying performance. Therefore, when these materials are used for the entire conductor, there is a problem that assembly workability and economy are lowered.

  The present invention has been proposed in order to solve the above-mentioned problems, and the mechanical strength is increased by suppressing the displacement due to the electromagnetic force of the short-circuit current and the resonance due to the seismic vibration depending on the configuration and shape of the conductor. It is an object of the present invention to provide a gas insulated bus conductor that can exhibit good insulation performance and energization performance, thereby contributing to lengthening and diameter reduction of the gas insulated bus.

  In order to achieve the above object, according to the present invention, in a gas insulated bus conductor provided in a sealed metal container filled with an insulating gas as an insulating medium, a part of the conductor is thicker than a solid part or other parts. A high strength portion made of a thick pipe is used, and the other portion is used as a pipe.

  In the present invention as described above, by providing a high-strength portion composed of a solid portion or a thick-walled pipe in a part of the conductor, resonance at the occurrence of an earthquake is prevented, and at the same time, the conductor is entirely composed of pipes. As compared with the case, the mechanical strength of the conductor against the electromagnetic force due to the short-circuit current at the time of short-circuit can be increased. In addition, since the amount of displacement of the conductor due to electromagnetic force is reduced, it is easy to secure an insulation distance, and high insulation performance can be obtained. Furthermore, since the cross-sectional area of the conductor increases, the amount of heat generated by the energization current decreases, and the temperature rise decreases with an increase in heat capacity. Therefore, it is possible to obtain excellent energization performance.

  According to the gas-insulated bus conductor of the present invention, the displacement due to the electromagnetic force of the short-circuit current and the resonance due to the earthquake vibration are suppressed by providing a high-strength portion made of a solid or thick pipe in a part of the conductor. As a result, it was possible to increase the mechanical strength and to exhibit good insulation performance and energization performance, contributing to the lengthening and diameter reduction of the gas insulated bus.

  Hereinafter, embodiments of a gas insulated bus conductor according to the present invention will be described in detail with reference to FIGS. The same members as those in the conventional example shown in FIG.

(1) First embodiment
[Constitution]
As shown in FIG. 1, the conductor 41A is composed of a solid center member 41a and pipe-shaped end members 4b and 4c, and is characterized in that the center member 41a is made of a copper material. The center member 41a and both end members 4b and 4c are joined.

[Configuration of Modified Example of First Embodiment]
As a modification of the first embodiment, it is also possible to provide solid members at both ends instead of the central portion of the conductor. That is, as shown in FIG. 2, the conductor 41B is composed of solid end members 41b and 41c and a pipe-shaped center member 4a, and the end features 41b and 41c are made of copper. There is. The center member 4a and both end members 41b and 41c are joined.

[Effect]
According to the first embodiment configured as described above, the current-carrying conductor 41A (or the conductor 41B) has the natural frequency because the central member 41a (or both end members 41b and 41c) has a solid configuration. Can be prevented and resonance during an earthquake can be prevented. Further, since the conductor 41A (or the conductor 41B) has a solid central member 41a (or both end members 41b and 41c), the conductor 41A is compared with the case where the conductor 41A (or the conductor 41B) is entirely constituted by pipes. The mechanical strength of (or the conductor 41B) can be increased, and the amount of displacement due to electromagnetic force due to a short-circuit current at the time of a short circuit can be suppressed.

  Further, as the mechanical strength increases, the amount of displacement due to the electromagnetic force decreases, so that it is easy to ensure the insulation distance, and the conductor 41A (or the conductor 41B) is excellent even when the diameter of the metal container 1 is reduced. Insulation performance can be maintained. Furthermore, since the cross-sectional area of the conductor 41A (or the conductor 41B) is increased by the amount of the central member 41a (or both end members 41b and 41c) being solid, the amount of heat generated by the energizing current is reduced, and the temperature rises as the heat capacity increases. Becomes smaller. That is, the conductor 41A (or the conductor 41B) can easily obtain good current-carrying performance. Moreover, since only the central member 41a (or both end members 41b and 41c) is made of copper, it is more economical than the case where the entire conductor is made of copper, and at the same time, copper has good conductivity, so it generates heat. -The temperature rise can be efficiently suppressed.

  According to the first embodiment as described above, the conductor 41A (or the mechanical strength, the insulating performance, and the current-carrying performance) are excellent by providing the solid and central copper member 41a (or both end members 41b and 41c). The conductor 41B) can be obtained, and the support span L (shown in FIG. 1) of the conductor 41A (or the conductor 41B) can be extended. As a result, it is possible to reliably cope with an increase in the length and diameter of the gas insulated bus.

(2) Second embodiment
[Constitution]
As shown in FIG. 3, the conductor 42A has a thick pipe shape and is composed of a central member 42a made of a copper material and pipe-shaped end members 4b and 4c, and the center member 4a and both end members 4b, 4c is joined.

[Configuration of Modified Example of Second Embodiment]
As a modification of the second embodiment, thick pipe-shaped members can be provided at both ends instead of the central portion of the conductor. That is, as shown in FIG. 4, the conductor 42A (or the conductor 42B) is a thick pipe-shaped central member 42b, 42c made of a copper material and a pipe-shaped central member 4a, and both end members 42b. , 42c is made of a copper material. The central member 4a and both end members 42b and 42c are joined.

[Effect]
According to the second embodiment configured as described above, the energizing conductor 42A (or the conductor 42B) is configured by forming only the central member 42a (or both end members 42b and 42c) with a thick pipe, A decrease in the natural frequency can be suppressed, and the natural frequency that resonates in the event of an earthquake is not achieved, and high mechanical strength can be ensured. At the same time, the conductor 42A (or the conductor 42B) with respect to the electromagnetic force due to the short-circuit current at the time of short-circuiting is compared with the case where the conductor 4 is entirely composed of a pipe having a smaller thickness than the central member 42a (or both-end members 42b and 42c) Mechanical strength is increased.

  Moreover, since the amount of displacement due to electromagnetic force is reduced due to the increase in mechanical strength, the insulation performance of the conductor 42A (or conductor 42B) is improved. Furthermore, since the central member 42a (or both end members 42b and 42c) is thick, the cross-sectional area of the conductor 42A (or conductor 42B) increases. Accordingly, the amount of heat generated by the energization current is reduced, and the temperature rise is reduced as the heat capacity is increased. In addition, since only the central member 42a (or both end members 42b and 42c) is made of copper, heat generation and temperature rise can be efficiently suppressed while ensuring excellent economic efficiency.

  In the second embodiment as described above, by providing the thick copper center member 42a (or both end members 42b and 42c), the mechanical strength, the insulation performance, and the energization performance are the same as in the first embodiment. Thus, it is possible to easily obtain the long conductor 42A (or the conductor 42B), and it is possible to obtain a gas-insulated bus whose length and diameter have been reduced.

(3) Third embodiment
[Constitution]
As shown in FIG. 5, the conductor 43A is composed of a central member 43a and pipe-shaped end members 4b and 4c, and a solid built-in member 7 made of stainless steel or iron is fixed inside the central member 43a. There is a feature in the made point. The central member 43a and both end members 4b and 4c are joined.

[Configuration of Modified Example of Third Embodiment]
As a modification of the third embodiment, the built-in member 7 may be placed at both ends instead of being placed at the center of the conductor. That is, as shown in FIG. 6, the conductor 43B is characterized in that the built-in member 7 is inserted and fixed on both end members 43b and 43c side. The center member 4a and both end members 43b and 43c are joined.

[Effect]
According to the third embodiment as described above, the conductive conductor 43A (or the conductor 43B) has the solid built-in member 7 made of stainless steel or iron inside the central portion (or both ends). Since it is inserted and fixed, the natural frequency does not resonate at the time of the earthquake, and the displacement amount due to the electromagnetic force of the short-circuit current is smaller than the case where the conductor 43A (or the conductor 43B) is composed entirely of pipes. It can be set as the conductor 43A (or conductor 43B) excellent in intensity | strength.

  Since the amount of displacement due to the electromagnetic force is small, the conductor 43A (or the conductor 43B) can obtain high insulation performance. Furthermore, the cross-sectional area of the conductor 43A (or the conductor 43B) is increased by the amount of the built-in member 7, and there is an advantage that the amount of heat generated by the energizing current is reduced and the temperature rise is reduced as the heat capacity is increased. is there.

  According to the third embodiment, the central member 43a (or both end members 43b and 43c) to which the built-in member 7 is fixed is provided, so that the mechanical member is mechanically similar to the first and second embodiments. The long conductor 43A (or conductor 43B) excellent in strength, insulation performance, and current-carrying performance can be easily realized, and can contribute to the lengthening and diameter reduction of the gas insulation bus. Further, since the built-in member 7 is made of stainless steel or iron material, it is lighter and less expensive than copper material, and the assembly workability and economy are significantly improved.

(4) Fourth embodiment
[Constitution]
As shown in FIG. 7, the conductor 44 is composed of a pipe-shaped center member 44a having a large outer diameter and made of copper, and pipe-shaped end members 4b and 4c. The center member 44a and both end members 4b and 4c are joined. Has been.

[Effect]
According to the fourth embodiment configured as described above, the current-carrying conductor 44 includes the central member 44a having a pipe shape with a large outer diameter, and thus the first to third implementations described above. Since the same effect as that of the form can be obtained, it is extremely advantageous economically.

(5) Fifth embodiment
[Constitution]
As shown in FIG. 8, the conductor 45 is characterized in that a long pipe 8 is provided on the outer periphery of the central portion. The material of the long pipe 8 may be stainless steel, iron, or FRP, or may be impregnated with a nonwoven fabric.

[Effect]
The long pipe 8 has good mechanical strength and insulation performance because it is impregnated with stainless steel, iron or FRP material, or non-woven fabric. Therefore, in the fifth embodiment, the long pipe 8 having excellent mechanical strength and insulation performance is provided on the outer periphery of the central portion of the conductor 45, so that the conductor against electromagnetic force due to the short-circuit current at the time of short-circuiting is provided. The mechanical strength is increased and the amount of displacement of the conductor is reduced, so that the insulation performance is improved.

(6) Sixth embodiment
[Constitution]
As shown in FIG. 9, the conductor 46A is composed of a central member 460a made of a plurality of thick pipes having different inner diameters, and pipe-shaped end members 4b and 4c. The center member 460a and the end members 4b 4c is joined.

[Configuration of Modified Example of Sixth Embodiment]
As a modification of the sixth embodiment, the thick pipe may be configured not to have different inner diameter dimensions but different outer diameter dimensions. That is, as shown in FIG. 10, the conductor 46B is composed of a central member 461a composed of a plurality of thick pipes having different outer diameters and pipe-shaped end members 4b and 4c. The central members 460a and 461a may have a solid shape instead of a thick pipe shape.

[Effect]
According to the sixth embodiment configured as described above, in addition to the above-described operational effects such as improvement in mechanical strength, insulation performance, and energization performance, there are the following unique operational effects. That is, by providing a plurality of thick pipes with different inner diameters (or outer diameters) at the center of the conductor 46A (or 46B), the natural frequency varies and resonance due to seismic vibration occurs. Can be unbalanced. As a result, it is difficult to resonate, and it is possible to exert an effect that the mechanical strength is further improved.

(7) Other Embodiments The present invention is not limited to the previous embodiment, and the configuration, shape, material, arrangement location, arrangement number, and the like of each member can be changed as appropriate. Is also included. That is, as shown in FIG. 11, the conductor 47 provided with several convex portions 47a on the outer peripheral part (four places in FIG. 11), or several places (eight places in FIG. 12) on the inner peripheral part as shown in FIG. The conductor 48 having the rib 48a may be used.

  Furthermore, the conductor 49 which provided the rib 49a connected with the opposing side at the inner peripheral side may be sufficient (refer FIG. 13). According to these embodiments, the provision of the convex portions 47a and the ribs 48a and 49a makes it difficult for the natural frequency to resonate during an earthquake, the mechanical strength increases, the amount of displacement decreases, and the insulation performance also decreases. Since the cross-sectional area increases and the cross-sectional area increases, the temperature rise is suppressed and the energization performance is also improved.

  Further, the conductor 40 shown in FIG. 14 is provided with a core material 40a on the inner side, and the outer surface of the core material 40a is covered with a coating material 40b having a higher conductivity than the core material 40a. According to the embodiment configured in this way, by providing the coating material 40b with high conductivity outside the core material 40a, the conductor is made by an energizing current rather than the case where all the conductors are configured by a single pipe-shaped member. The calorific value is reduced, the temperature rise is reduced, and excellent energization performance can be exhibited.

Sectional drawing which shows the 1st Embodiment of this invention. Sectional drawing of the modification of the 1st Embodiment of this invention. Sectional drawing which shows the 2nd Embodiment of this invention. Sectional drawing which shows the modification of the 2nd Embodiment of this invention. Sectional drawing which shows the 3rd Embodiment of this invention. Sectional drawing which shows the modification of the 3rd Embodiment of this invention. Sectional drawing which shows the 4th Embodiment of this invention. Sectional drawing which shows the 5th Embodiment of this invention. Sectional drawing which shows the modification of the 5th Embodiment of this invention. Sectional drawing which shows the 6th Embodiment of this invention. Front sectional drawing which shows other embodiment of this invention. Front sectional drawing which shows other embodiment of this invention. Front sectional drawing which shows other embodiment of this invention. Front sectional drawing which shows other embodiment of this invention. Sectional drawing which shows an example of the conventional gas insulation bus-bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Metal container 2a, 2b ... Insulating spacer 3a, 3b ... Contact 4, 40, 41A, 41B, 42A, 42B, 43A, 43B, 44, 45, 46A, 46B, 47, 48, 49 ... Conductor 4a, 41a 42a, 43a, 43a, 44a, 460a, 461a ... Central members 4b, 4c, 41b, 41c, 42b, 42c, 43b, 43c, 41b, 41c ... Both end members 40a ... Core material 40b ... Covering material 47a ... Projection 48a 49a ... ribs 5a, 5b ... slide contact 6 ... insulating gas 7 ... built-in member 8 ... long pipe

Claims (13)

In the gas insulated bus conductor provided in a sealed metal container filled with an insulating gas as an insulating medium,
A gas-insulated bus conductor, characterized in that a part is a high-strength part made of a pipe thicker than a solid part or another part, and the other part is used as a pipe.   2. The gas insulated bus conductor according to claim 1, wherein the high-strength portion is made of a copper material.   The gas insulated bus conductor according to claim 1 or 2, wherein a solid material made of stainless steel or iron is placed and fixed in the high-strength portion.   4. The gas-insulated bus conductor according to claim 1, wherein an outer diameter of the high-strength portion is larger than that of other portions.   The gas-insulated bus conductor according to any one of claims 1 to 4, wherein the high-strength portion is provided in a central portion.   The gas-insulated bus conductor according to any one of claims 1 to 4, wherein the high-strength portions are provided at both ends. In the gas insulated bus conductor provided in a sealed metal container filled with an insulating gas as an insulating medium,
A gas insulated bus conductor characterized in that a long pipe made of at least one of stainless steel, iron and FRP material is provided on the outer periphery of the central portion. In the gas insulated bus conductor provided in a sealed metal container filled with an insulating gas as an insulating medium,
A gas insulated bus conductor characterized in that a long pipe impregnated with a nonwoven fabric is provided on the outer periphery of the central portion. In the gas insulated bus conductor provided in a sealed metal container filled with an insulating gas as an insulating medium,
A gas insulated bus conductor characterized in that a plurality of thick pipes or solid portions having different inner diameters or outer diameters are provided in the center.   The gas-insulated bus conductor according to any one of claims 1 to 9, wherein a convex portion is provided on the outer peripheral portion.   The gas insulating bus conductor according to any one of claims 1 to 10, wherein a rib is provided on an inner peripheral portion.   12. The gas insulated bus conductor according to claim 11, wherein the ribs are opposed to each other. 13. The gas-insulated bus conductor according to claim 1, wherein a core material is provided on the inner side, and a coating material having a higher conductivity than the core material is coated on the outer side of the core material.

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