Gas insulated switchgear

Abstract

To provide a gas insulated switchgear capable of suppressing an increase in voltage applied between a contact electrode on the side of a voltage application portion and an arc shield by increasing the arc shield potential of a vacuum circuit breaker.SOLUTION: In a gas insulated switchgear constructed by supporting a vacuum circuit breaker in an insulated state in a grounding container, an arc shield voltage regulating conductor made of a conductive material one end of which is electrically connected to a high-voltage conductor on the power supply side of the vacuum circuit breaker, and the other end of which is arranged so as to be positioned near the vacuum circuit breaker through a specified spatial distance.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a gas-insulated switchgear that is applied to a substation, a switching station, etc., and more particularly to a gas-insulated switchgear that uses a vacuum circuit breaker. [Background technology]

[0002] Gas-insulated switchgear plays an important role in power systems, such as protecting the system from short-circuit faults caused by lightning strikes and controlling switching for system operation. One phase is made up of devices such as a vacuum circuit breaker, disconnecting switch, earthing switch, high-speed earthing switch, main busbar, instrument current transformer, instrument voltage transformer, and cable connection section. Three phases are arranged in parallel to form one circuit, which is connected by the main busbar.

[0003] The inside of the earthing container of each device is filled with gas with excellent insulating performance, such as SF6 gas, and the high-voltage conductor is supported or fixed by an insulating spacer, insulating tube, or the like. This gas-insulated switchgear has a sealed structure and is not affected by the external environment, so it is widely used as a highly reliable switchgear. As an example of a conventional gas-insulated switchgear, the gas-insulated switchgear described in JP 2014-99381 A (Patent Document 1) is known.

[0004] The invention in Patent Document 1 aims to provide a gas-insulated switchgear that can be made compact by reducing its height. The power receiving cable drawn in from the cable head is electrically connected to the power receiving side disconnecting switch, the power receiving side earthing switch, and the arrester.

[0005] In the power receiving side area, the circuit breaker is connected to the power receiving cable via the power receiving side disconnector, and is also connected to the lower-side disconnector with earthing switch via an insulating spacer, and the lower-side disconnector with earthing switch has a ground electrode on the back side of the gas insulating container.

[0006] Furthermore, a busbar side electrode is provided on the ground electrode side of the electrical connection portion with the circuit breaker, and the busbar side electrode is connected to one of the busbars via the main circuit side electrode of the disconnector with earthing switch provided above. The disconnector with earthing switch provided above has a ground electrode on the front side of the gas insulating container, and the other busbar is connected between the main circuit electrode and the ground electrode of the disconnector with earthing switch provided above. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2014-99381 A Summary of the Invention [Problem to be solved by the invention]

[0008] Patent Document 1 describes a gas-insulated switchgear having a circuit breaker, disconnecting switch, etc. installed inside an airtight container at ground potential filled with insulating gas, and having a supply unit that supplies power from a power receiving unit that receives power from a power system to the load side via the circuit breaker, disconnecting switch, etc.

[0009] In recent years, the circuit breakers used in gas-insulated switchgear are vacuum circuit breakers from the viewpoint of durability, and a vacuum circuit breaker with a contact electrode housed in a gas-insulated container is arranged. An arc shield is arranged around the contact electrode in the vacuum circuit breaker in a floating potential state to protect the insulating case that forms the vacuum container from the arc (metal vapor) that is generated when the contact electrode interrupts the current.

[0010] Here, the potential of the arc shield of a vacuum circuit breaker operated at floating potential is determined by the spatial capacitance between the surrounding high voltage components, ground potential components, and insulating components. However, since the vacuum circuit breaker is placed near a sealed container which is at ground potential, the potential of the arc shield of the vacuum circuit breaker drops to less than half of the applied voltage on the power supply side.

[0011] In such cases, the voltage (potential difference) applied between the contact electrode on the voltage application side and the arc shield becomes high, making it necessary to increase the insulation distance, which poses the problem that it is not possible to reduce the size (physical dimensions) of the vacuum circuit breaker.

[0012] The object of the present invention is to provide a gas-insulated switchgear capable of suppressing an increase in the voltage (potential difference) applied between the contact electrode on the voltage application side and the arc shield by increasing the potential of the arc shield of a vacuum circuit breaker. [Means for solving the problem]

[0013] In order to solve the above-mentioned problems, the present invention provides a gas-insulated switchgear configured by supporting a vacuum circuit breaker having a fixed electrode and a movable electrode, with an arc shield arranged around these electrodes, in a sealed container at ground potential in which insulating gas is sealed, in a state in which it is electrically insulated from the sealed container, and is characterized in that it provides an arc shield voltage adjusting conductor made of a conductive material, one end of which is electrically connected to a high-voltage conductor that is the power source side of the vacuum circuit breaker, and the other end of which is arranged so as to be located in the vicinity of the vacuum circuit breaker with a predetermined spatial distance therebetween. Effect of the Invention

[0014] According to the present invention, by increasing the potential of the arc shield of the vacuum circuit breaker, it is possible to prevent the voltage (potential difference) applied between the contact electrode on the voltage application side and the arc shield from increasing. Note that problems, configurations and effects other than those described above will become clear from the description of the embodiments given below. [Brief description of the drawings]

[0015] [Figure 1] 1 is a sectional view of a gas-insulated switchgear according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view for explaining the configuration of the vacuum circuit breaker shown in FIG. [Diagram 3] FIG. 4 is a sectional view of a gas-insulated switchgear according to a second embodiment of the present invention. [Figure 4] FIG. 5 is a sectional view of a gas-insulated switchgear according to a third embodiment of the present invention. [Diagram 5] FIG. 11 is a sectional view of a gas-insulated switchgear according to a fourth embodiment of the present invention. [Figure 6] FIG. 11 is a sectional view of a gas-insulated switchgear according to a fifth embodiment of the present invention. [Figure 7A] 1 is a cross-sectional view of a first modified example of an arc shield voltage adjusting conductor used in an embodiment of the present invention. FIG. [Figure 7B] FIG. 11 is a cross-sectional view of a second modified example of an arc shield voltage adjusting conductor used in an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The following describes in detail an embodiment of the present invention with reference to the drawings. However, the present invention is not limited to the following embodiment, and various modifications and applications within the technical concept of the present invention are also included in the scope of the present invention. Below, examples of the gas-insulated switchgear of the present invention are described with reference to the drawings. Note that the same reference numerals are used for the same components in each example. EXAMPLES

[0017] Fig. 1 shows a side cross section of a gas-insulated switchgear according to a first embodiment of the present invention. The gas-insulated switchgear configured as a power receiving unit for general consumers is configured so that high-voltage equipment components are supported in a sealed container filled with insulating gas for each gas compartment space in a state in which they are electrically insulated from the sealed container by insulating supports.

[0018] 1, a vacuum circuit breaker (vacuum valve) 11 is disposed, and one end (movable electrode side) of this vacuum circuit breaker 11 is connected to a circuit breaker-side high-voltage conductor 12A and a circuit breaker-side high-voltage conductor 12B via a circuit breaker 13, and the circuit breaker-side high-voltage conductor 12B is further connected to a cable head 14 and led out of the first sealed container 10 in an insulated state, and finally connected to a cable 15. The cable 15 is then connected to various load devices, not shown.

[0019] Also, a grounding switch 16 is disposed in the first sealed container 10 for grounding the internal disconnector side high voltage conductor 12B during periodic inspection, etc. Insulating support members 17 having a predetermined insulating performance are disposed in the first sealed container 10, which houses and disposes the vacuum circuit breaker 11, the disconnector 13, the grounding switch 16, and the high voltage conductors 12A, 12B connecting them, etc., and these insulating support members 17 support the vacuum circuit breaker 11, the disconnector 13, the grounding switch 16, and the high voltage conductors 12A, 12B connecting them, etc., in a state in which they are electrically insulated from the first sealed container 10. Therefore, the first sealed container 10 is at ground potential.

[0020] In addition, the other end (fixed electrode side) of the vacuum circuit breaker 11 is connected to the circuit breaker side high voltage conductor 12C, and this circuit breaker side high voltage conductor 12C is led to the inside of a second sealed container 19 that is gaseously separated from the first sealed container 10 via an insulating spacer 18, and is connected to one end of a circuit breaker 20.

[0021] Furthermore, the other end of this disconnector 20 is connected via the high-voltage conductor 12D to an adjacent device that is gaseously separated from the second sealed container 19 by an insulating spacer 21. Insulating support members 17 having a predetermined insulating performance are arranged in the second sealed container 19 that houses and arranges the disconnector 20, the high-voltage conductor 12D, etc., and these insulating support members 17 support the disconnector 20 and the high-voltage conductor 12D, etc. in a state where they are electrically insulated from the second sealed container 19. Therefore, the second sealed container 19 is at ground potential.

[0022] Although not shown in detail, the movable electrode side of the vacuum circuit breaker 11 (the lower side of the vacuum circuit breaker), the movable side of the disconnector 13 (the left side of the disconnector in the drawing), the movable side of the earthing switch 16 (the left side of the earthing switch in the drawing), and the movable side of the disconnector 20 (the left side of the disconnector in the drawing) are each led out via a link mechanism while maintaining the airtightness of the first sealed container 10 and the second sealed container 19, and are connected to each operating device arranged in the operation panel 22.

[0023] Fig. 2 shows a cross section of the vacuum circuit breaker 11 shown in Fig. 1. However, Fig. 2 also shows an arc shield voltage adjusting conductor 23, which is a feature of this embodiment, but this will be described later.

[0024] 2, the vacuum circuit breaker 11 is composed of a fixed end plate 31 joined to one end of a cylindrical insulating case 30, a fixed conductor 32 that passes through the fixed end plate 31 in an airtight state, a movable end plate 33 joined to the other end of the cylindrical insulating case 30, a bellows 34 having one end connected to the movable end plate 33 and allowing the movable part to be driven, and a movable conductor 35 that passes through the bellows 34 in an airtight state and is driven in the axial direction while maintaining a vacuum. The internal pressure is about 10 ―2 It is kept at a vacuum of less than Pa.

[0025] Inside the cylindrical insulating case 30, there are arranged an arc shield 36 at a floating potential supported by the cylindrical insulating case 30, a fixed electrode 37 fixed to an end of the fixed conductor 32, and a movable electrode 38 fixed to an end of the movable conductor 35. The movable conductor 35 is connected to an operation mechanism disposed outside the first sealed container 10 via an operation rod (not shown). The movable electrode 38 is driven in conjunction with the driving operation of the operation mechanism, whereby the fixed electrode 37 and the movable electrode 38 can be brought into contact with and separated from each other, i.e., the vacuum circuit breaker can be switched between an open state and a closed state.

[0026] Here, the potential of the arc shield 36 of the vacuum circuit breaker 11, which is operated at a floating potential, is determined by the spatial capacitance around the high-voltage members, ground potential members, and insulating members arranged in the first sealed container 10. Because the vacuum circuit breaker 11 is arranged near the first sealed container 10, which is at ground potential, the potential of the arc shield 36 of the vacuum circuit breaker 11 may drop to half or less of the applied voltage, and the voltage (potential difference) acting between the fixed electrode 37 and the arc shield 36 becomes high, making it necessary to increase the insulation distance, which has posed a problem in that the size (physical dimensions) of the vacuum circuit breaker 11 cannot be reduced.

[0027] In order to address this issue, this embodiment proposes a configuration that prevents the voltage (potential difference) acting between the fixed electrode 37 and the arc shield 36 from becoming high by increasing the potential of the arc shield 36 of the vacuum circuit breaker 11.

[0028] Returning to Figure 1, this embodiment is characterized in that in a gas-insulated switchgear in which a vacuum circuit breaker 11 is supported in an insulated state inside a first earthed container 10, an arc shield voltage adjusting conductor 23 is provided that is electrically connected to the circuit breaker side high voltage conductor 12C arranged inside the first sealed container 10.

[0029] In other words, one end 23S of the arc shield voltage adjustment conductor 23 is electrically connected to the circuit breaker side high voltage conductor 12C arranged in the first sealed container 10 which is the power supply side of the vacuum circuit breaker 11, and the other end 23E is arranged so as to be located in the vicinity of the vacuum circuit breaker 11 via a "predetermined spatial distance".

[0030] As shown in Fig. 2, the arc shield voltage adjustment conductor 23 has a "rod-like" shape made of a conductive material such as aluminum or copper, and has a circular cross section. The tip is formed as a spherical surface or an arc-shaped surface other than a spherical surface. The reason for using such a shape is to avoid the formation of corners that tend to cause electric field concentration and discharge phenomena. In this embodiment, the spherical surface is also treated as an arc-shaped surface.

[0031] Moreover, the arc shield voltage adjusting conductor 23 is arranged to extend to point P where the arc shield 36 is present. Furthermore, the direction in which the arc shield voltage adjusting conductor 23 extends (axial direction) is set to be the same as the longitudinal direction of the arc shield 36. Here, the above-mentioned predetermined spatial distance (D) shown in Fig. 2 is a distance that can ensure a predetermined level of insulation performance that prevents discharge between the vacuum circuit breaker 11 and the arc shield voltage adjusting conductor 23. Note that this distance is a value that is appropriately determined depending on the specifications of the gas-insulated switchgear.

[0032] In the gas-insulated switchgear of this embodiment configured as described above, by arranging the arc shield voltage adjusting conductor 23 in the vicinity of the vacuum circuit breaker 11 (a predetermined spatial distance away), capacitance is generated between the arc shield 36 at floating potential arranged inside the cylindrical insulating case 30 and the arc shield voltage adjusting conductor 23, causing the potential of the arc shield 36 at floating potential to rise.

[0033] Here, if the arc shield voltage adjustment conductor 23 is not arranged, the potential of the arc shield 36, which is at floating potential, is determined by the divided voltage of the capacitance, which is determined by the distance and opposing area between the high voltage conductors 12A-12C around the vacuum circuit breaker 11 and the first sealed container 10, which is at ground potential.

[0034] Since the capacitance of the first sealed container 10 at ground potential and the arc shield 36 at floating potential is greater than the capacitance of the high voltage conductors 12A-12C and the arc shield 36, the impedance of the first sealed container 10 at ground potential and the arc shield 36 at floating potential is smaller than the capacitance of the high voltage conductors 12A-12C and the arc shield 36, and the potential of the arc shield 36 becomes closer to the ground potential (approaching the ground potential).

[0035] In other words, the potential difference between the high-voltage conductors 12A-12C and the arc shield 36 is larger than the potential difference between the first sealed container 10 and the arc shield 36. In such a case, a high electric field is inevitably generated between the high-voltage conductors 12A-12C and the arc shield 36, which have a large potential difference, and therefore the insulation distance needs to be increased, which results in an increase in the size of the vacuum circuit breaker 11 and, ultimately, the size of the gas-insulated switchgear.

[0036] As shown in this embodiment, by arranging the arc shield voltage adjustment conductor 23 near the vacuum circuit breaker 11 to raise the potential of the arc shield 36 and making the potential difference between the sealed container 10 and the arc shield 36 approximately equal to the potential difference between the high-voltage conductors 12A-12C and the arc shield 36, the potential of the arc shield 36 of the vacuum circuit breaker 11 can be raised and an increase in the voltage applied between the fixed electrode 37, which is the voltage application part, and the arc shield 36 can be prevented. As a result, the distance between the fixed electrode 37 and the arc shield 36 can be shortened, thereby realizing a compact vacuum circuit breaker.

[0037] In addition, since the arc shield voltage adjusting conductor 23 is connected to the circuit breaker side high voltage conductor 12C, the arc shield voltage adjusting conductor 23 can act as a heat dissipation fin for Joule heat generated by the current flowing through the circuit breaker side high voltage conductor 12C, so that the diameter of the circuit breaker side high voltage conductor 12C can be reduced, which in turn contributes to making the gas insulated switchgear smaller and lighter. EXAMPLES

[0038] Next, a second embodiment of the present invention will be described. In the first embodiment, the second sealed container 19 side is the power source side, and therefore the arc shield voltage adjustment conductor 23 is connected to the circuit breaker side high voltage conductor 12C. In contrast, in the second embodiment, the circuit breaker side high voltage conductor 12A of the first sealed container 10 is the power source side. Note that a description of the same parts as in the first embodiment will be omitted.

[0039] In FIG. 3, this embodiment is characterized in that in a gas-insulated switchgear in which a vacuum circuit breaker 11 is supported in an insulated state inside a first earthed container 10, an arc shield voltage adjusting conductor 24 is provided which is electrically connected to the circuit breaker side high voltage conductor 12A arranged inside the first sealed container 10.

[0040] That is, one end 24S of the arc shield voltage adjusting conductor 24 is electrically connected to the circuit breaker-side high-voltage conductor 12A arranged in the first sealed container 10 which is the power supply side of the vacuum circuit breaker 11, and the other end 24E is arranged to be located in the vicinity of the vacuum circuit breaker 11 with a predetermined spatial distance therebetween. The arrangement of the arc shield voltage adjusting conductor 24 and the vacuum circuit breaker 11 is the same as in the first embodiment.

[0041] In this embodiment as well, the arc shield voltage adjustment conductor 24 is disposed near the vacuum circuit breaker 11 to raise the potential of the arc shield 36, and the potential difference between the sealed container 10 and the arc shield 36 and the potential difference between the high-voltage conductors 12A-12C and the arc shield 36 are roughly equivalent, thereby raising the potential of the arc shield 36 of the vacuum circuit breaker 11 and preventing an increase in the voltage applied between the fixed electrode 37, which is the voltage application part, and the arc shield 36. As a result, the distance between the fixed electrode 37 and the arc shield 36 can be shortened, thereby realizing a compact vacuum circuit breaker. EXAMPLES

[0042] Next, a third embodiment of the present invention will be described. In the first embodiment, the surface of the arc shield voltage adjustment conductor 23 is in a state where a conductive material is exposed. In contrast, in the third embodiment, an insulating paint is applied to the surface of the arc shield voltage adjustment conductor 23. Note that a description of the same parts as in the first embodiment will be omitted.

[0043] 4, an insulating coating layer 25C made of insulating paint is formed on the surface of the arc shield voltage adjusting conductor 25 of the gas insulated switchgear of this embodiment. The insulating coating layer 25C may be formed on the entire surface of the arc shield voltage adjusting conductor 25, or may be formed only on a necessary portion.

[0044] The gas-insulated switchgear configured in this manner can suppress the electric field on the surface of the arc shield voltage adjusting conductor 25 connected to the circuit breaker-side high-voltage conductor 12C, thereby improving the insulation performance. As a result, the insulation distance between the arc shield voltage adjusting conductor 25 and its surrounding components can be shortened, thereby making it possible to further miniaturize the gas-insulated switchgear. EXAMPLES

[0045] Next, a fourth embodiment of the present invention will be described. In the second embodiment, the surface of the arc shield voltage adjustment conductor 24 is in a state where the conductive material is exposed. In contrast, in the fourth embodiment, an insulating paint is applied to the surface of the arc shield voltage adjustment conductor 24. Note that a description of the same parts as in the second embodiment will be omitted.

[0046] 5, an insulating coating layer 26C made of insulating paint is formed on the surface of the arc shield voltage adjusting conductor 26 of the gas insulated switchgear of this embodiment. The insulating coating layer 26C may be formed on the entire surface of the arc shield voltage adjusting conductor 26, or may be formed only on a necessary portion.

[0047] The gas-insulated switchgear configured in this manner can suppress the electric field on the surface of the arc shield voltage adjusting conductor 26 connected to the circuit breaker-side high-voltage conductor 12A, thereby improving the insulation performance. As a result, the insulation distance between the arc shield voltage adjusting conductor 26 and its surrounding components can be shortened, thereby making it possible to further miniaturize the gas-insulated switchgear. EXAMPLES

[0048] Next, a fifth embodiment of the present invention will be described. In the first to fourth embodiments, the arc shield voltage adjusting conductors 23 to 26 are connected to the circuit breaker side high voltage conductors 12C and 12A connected to the vacuum circuit breaker 11. In contrast, in the fifth embodiment, the disconnector side high voltage conductor 12B of the first sealed container 10 is set as the power source side, and an arc shield voltage adjusting conductor 27 is connected to it. Note that a description of the same parts as in the first embodiment will be omitted.

[0049] In FIG. 6, the present invention is characterized in that an arc shield voltage adjusting conductor 27 is provided electrically connected to the disconnector side high voltage conductor 12B arranged in the first sealed container 10 and connected to the disconnector 13.

[0050] That is, one end 27S of the arc shield voltage adjusting conductor 27 is electrically connected to the disconnector-side high-voltage conductor 12B arranged in the first sealed container 10 which is the power supply side of the vacuum circuit breaker 11, and the other end 27E is arranged to be located in the vicinity of the vacuum circuit breaker 11 with a "predetermined spatial distance" therebetween. Note that the arrangement of the arc shield voltage adjusting conductor 27 and the vacuum circuit breaker 11 is different from that of the previous embodiment, in that they are arranged in a direction perpendicular to the longitudinal direction of the arc shield 36.

[0051] Also in this embodiment, by arranging the arc shield voltage adjustment conductor 27 in the vicinity of the vacuum circuit breaker 11 to raise the potential of the arc shield 36 and making the potential difference between the sealed container 10 and the arc shield 36 approximately equal to the potential difference between the high-voltage conductors 12A-12C and the arc shield 36, the potential of the arc shield 36 of the vacuum circuit breaker 11 can be raised and an increase in the voltage applied between the movable electrode 38, which is the voltage application part, and the arc shield 36 can be prevented from increasing. As a result, the distance between the movable electrode 38 and the arc shield 36 can be shortened, thereby realizing a compact vacuum circuit breaker. EXAMPLES

[0052] Next, modified shapes of the arc shield voltage adjustment conductors 23-26 will be described. The above-mentioned arc shield voltage adjustment conductors 23-26 are rod-shaped and made of a solid conductive material with a circular cross section. However, they may also be shaped as follows. In the following, the arc shield voltage adjustment conductors 23-26 are illustrated in an exaggerated manner to facilitate understanding.

[0053] 7A, the arc shield voltage adjustment conductors 23-26 are rod-shaped and made of a solid conductive material with an elliptical cross section. This shape also makes it possible to increase the potential of the arc shield 36 of the vacuum circuit breaker 11. In addition, since there are no corners, electric field concentration can also be suppressed.

[0054] 7B, the arc shield voltage adjustment conductors 23-26 are rod-shaped made of a solid conductive material with an arc-shaped or circular cross section. This shape can also increase the potential of the arc shield 36 of the vacuum circuit breaker 11. In addition, since there are no corners, electric field concentration can be suppressed. In this embodiment, the arc shape includes a circular arc shape.

[0055] As described above, the present invention is a gas-insulated switchgear configured by supporting a vacuum circuit breaker having a fixed electrode and a movable electrode, with an arc shield arranged around these electrodes, in a sealed container at ground potential in which insulating gas is sealed, in a state in which it is electrically insulated from the sealed container, and is characterized in that it provides an arc shield voltage adjusting conductor made of a conductive material, one end of which is electrically connected to a high-voltage conductor serving as the power source side of the vacuum circuit breaker, and the other end of which is arranged so as to be located in the vicinity of the vacuum circuit breaker with a predetermined spatial distance therebetween.

[0056] According to this, by increasing the arc shield potential of the vacuum circuit breaker, it is possible to prevent the voltage applied between the contact electrode on the voltage application side and the arc shield from becoming high.

[0057] The present invention is not limited to the above-mentioned embodiment, and various modified examples are included. For example, the above-mentioned embodiment is specifically described in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to having all of the configurations described. Also, a part of the configuration of one embodiment can be replaced with a part of the configuration of another embodiment. Also, a configuration of another embodiment can be added to a configuration of one embodiment. Also, a part of the configuration of each embodiment can be deleted, a part of another configuration can be added, and a part of another configuration can be replaced with a part of another configuration. [Explanation of symbols]

[0058] 10...first sealed container, 11...vacuum circuit breaker (vacuum valve), 12A...circuit breaker side high voltage conductor, 12B...disconnector side high voltage conductor, 12C...circuit breaker side high voltage conductor, 12D...high voltage conductor, 13...disconnector, 14...cable head, 15...cable, 16...earthing switch, 17...insulating support member, 18...insulating spacer, 19...second sealed container, 20...disconnector, 22...operation panel, 23...arc shield voltage adjusting conductor, 25C, 26C...insulating coating layer, 30...cylindrical insulating case, 31...fixed side end plate, 32...fixed side conductor, 33...movable side end plate, 34...bellows, 35...movable side conductor, 36...arc shield, 37...fixed side electrode, 38...movable side electrode.

Claims

1. A gas-insulated switchgear is constructed by supporting a vacuum circuit breaker, which is provided with a fixed conductor having a fixed electrode and a movable conductor having a movable electrode inside a sealed container at a ground potential in which insulating gas is sealed, and which has an arc shield disposed around these electrodes, while being electrically insulated from the sealed container, a rod-shaped arc shield voltage adjusting conductor made of a conductive material is provided, the rod-shaped arc shield voltage adjusting conductor having one end electrically connected to a high voltage conductor serving as a power source side of the vacuum circuit breaker and the other end disposed in the vicinity of the vacuum circuit breaker via a predetermined spatial distance; The rod-shaped arc shield voltage adjustment conductor is disposed in a direction perpendicular to the longitudinal direction of the arc shield, in which the arc shield extends along the fixed conductor and the movable conductor.

1. A gas-insulated switchgear comprising:

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