JP6975111B2 - Gas insulation switchgear - Google Patents

Description

The present invention relates to a gas-insulated switchgear.

In facilities such as high-voltage power plants and substations that have high-voltage and large-capacity power systems as equipment, gas-insulated switchgear is installed for the purpose of protecting these equipment. In recent years, there has been a demand for application to underground substations in urban areas and improvement of economic efficiency, and it is necessary to make the equipment compact.

Generally, in a gas-insulated switchgear, an arc electrode having a configuration for suppressing damage to a contactor for energization or a shield due to an arc discharge generated at the time of opening a pole is arranged.

As a structure that cuts off an arc discharge in a short time, a structure for generating a magnetic field and utilizing an electromagnetic force is known. This includes a structure using a permanent magnet and a structure using a spiral electrode for driving an arc.

In a gas-insulated switch using a permanent magnet, a permanent magnet that drives an arc generated between a fixed contact and a movable contact is provided on at least one of the fixed contact and the movable contact, and is fixed. At least one of the contactor and the movable contactor is provided with a substantially continuous annular arc traveling portion (Patent Document 1). This arc traveling portion easily smoothes the rotation of the arc.

As a gas-insulated switch using a spiral electrode, a spiral electrode is provided at the tip of at least one of the fixed-side contactor and the mover on the opposite side, and the spiral electrode has a substantially annular arc traveling portion having a spiral groove formed. (Patent Document 2). This gas-insulated switch efficiently rotates the arc by providing a non-contact recess located inside the arc traveling portion.

Japanese Unexamined Patent Publication No. 2003-346611 Japanese Unexamined Patent Publication No. 2008-176942

In the conventional arc-driven gas-insulated switch using electromagnetic force, the magnetic field in the radial direction becomes weak near the central axis between the arc electrodes. Therefore, when an arc is generated near the central axis, the action of the magnetic force on the arc becomes insufficient, the arc stagnates, and the breaking performance deteriorates.

Further, when an arc is generated in the spiral electrode, the arc generation location of the spiral electrode is damaged. A spiral electrode having a complicated shape requires cutting or the like at the time of fabrication, and it is difficult to use a high-hardness metal having arc resistance. Therefore, the spiral electrode must be made of a metal that is easily damaged by the generation of an arc. Therefore, it is desirable to avoid the generation of arcs in the spiral electrode as much as possible from the viewpoint of the life of the spiral electrode.

An object of the present invention is to ensure the breaking performance by effectively applying the magnetic driving force of the spiral electrode to the entire arc electrode in the gas-insulated switchgear, and to prevent the spiral electrode from being damaged by the arc to increase the magnetic driving force. It is to maintain the period.

The gas-insulated switching device of the present invention includes a fixed-side contactor and a movable-side contactor, and at least one of the fixed-side contactor and the movable-side contactor includes a rod, an arc electrode, and a spiral electrode. , The arc electrode is arranged between the spiral electrode and other contacts, the arc electrode and the spiral electrode are electrically connected at the outer peripheral portion of each, and the arc electrode has a through hole. The spiral electrode and the rod are connected by a rod connecting portion, and a through hole is provided at a position facing the rod connecting portion.

According to the present invention, in the gas-insulated switchgear, the magnetic driving force of the spiral electrode is effectively applied to the entire arc electrode to secure the breaking performance, and the spiral electrode is prevented from being damaged by the arc to increase the magnetic driving force. It can be maintained for a period of time.

It is an exploded perspective view which shows the main part of the contact of Example 1. FIG. It is a front view which shows the arc electrode of FIG. It is sectional drawing which shows the arc electrode of FIG. It is sectional drawing which shows the spiral electrode of FIG. It is a front view which shows the spiral electrode of FIG. It is sectional drawing of the main part which shows the state which assembled the contact member of Example 1. FIG. It is a schematic sectional drawing which shows the closed pole state of the gas insulation switch of Example 1. FIG. It is an enlarged view of the main part of FIG. It is schematic cross-sectional view which shows the state in the process of opening the gas insulation switch of FIG. It is an exploded perspective view which shows the electric current in the state which the arc is generated in the contact of Example 1. FIG. It is a schematic cross-sectional view which shows the electric current and the magnetic field in the state which the arc is generated in the contact of Example 1. FIG. It is a graph which shows the distribution of the magnetic field in the radial direction generated by the electric current in the spiral electrode of the contact of Example 1. FIG. It is sectional drawing of the main part which shows the open pole state of the gas insulation switch of Example 1. FIG. It is sectional drawing of the main part which shows the contact of Example 2. FIG. It is sectional drawing of the main part which shows the open pole state of the gas insulation switch of Example 3. FIG. It is sectional drawing of the main part which shows the open pole state of the gas insulation switch of Example 4.

In the gas-insulated switching device of the present invention, in order to effectively apply the magnetic driving force of the spiral electrode to the entire arc electrode and prevent the spiral electrode from being damaged by the arc, the spiral electrode is covered with the arc electrode and the spiral electrode is provided. It has a configuration in which the outer peripheral portion is connected to the outer peripheral portion of the arc electrode.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing a main part of the contactor of the first embodiment.

The contact shown in this figure may be used on either the fixed side or the movable side.

As shown in this figure, the end of the contact includes an arc electrode 1, a spiral electrode 2, and a rod 3 for fixing the spiral electrode 2. The arc electrode 1 has a through hole 51.

The arc electrode 1 is made of a metal having arc resistance. Specifically, an alloy containing copper and tungsten as main components, an alloy containing copper and chromium as main components, or an alloy containing copper and alumina as main components, which are resistant to the heat of arc, are desirable. Further, the arc electrode 1 should have a low magnetic permeability so that the magnetic field generated by the current of the spiral electrode 2 extends to the arc.

Since the spiral electrode 2 has a complicated shape, an alloy that is easy to process is desirable. Since the heat generated by the arc is transferred, some degree of heat resistance is also required. From this point of view, brass and other copper alloys, stainless steel and the like are desirable.

The rod 3 is a columnar rod made of metal and has a strength capable of withstanding an impact caused by an opening / closing operation of an electrode. Further, the rod 3 is electrically connected to the spiral electrode 2.

FIG. 2A is a front view showing the arc electrode of FIG.

FIG. 2B is a cross-sectional view of this arc electrode.

The arc electrode 1 has a disk shape and has a through hole 51 having a diameter a at the center thereof. Further, the arc electrode 1 has a brim portion 52 and a side surface portion 53 having a diameter b. The brim portion 52 constitutes the outer peripheral portion of the arc electrode 1. Therefore, the cross-sectional shape of the arc electrode 1 is convex.

FIG. 3A is a cross-sectional view showing the spiral electrode of FIG.

FIG. 3B is a front view of the spiral electrode.

The spiral electrode 2 includes an outer peripheral portion 61, an annular portion 62, and a flat spiral current passage 26 connecting the outer peripheral portion 61 and the annular portion 62. The annular portion 62 has a closed shape and has a through hole 63 having a diameter c. The spiral current passage 26 is separated from the outer peripheral portion 61 toward the annular portion 62 by a single spiral groove 4. In other words, the spiral groove 4 constitutes a gap of the current passage 26 which is a conductor portion of the spiral electrode 2.

The outer peripheral portion 61 is thicker than the annular portion 62 and the current passage 26. Therefore, the cross-sectional shape of the spiral electrode 2 is concave as a whole.

The current passage 26 is configured such that a spiral current flows between the start point 21 of the spiral electrode 2 and the outer peripheral portion 61 including the end point 22 of the spiral electrode 2.

FIG. 4 is a cross-sectional view of a main part showing a state in which the arc electrode 1, the spiral electrode 2, and the rod 3 of FIG. 1 are assembled.

As shown in FIG. 4, the convex surface of the arc electrode 1 and the concave surface of the spiral electrode 2 are fitted together. These are fixed by screws, silver brazing, or a combination of screws and silver brazing. Further, it may be fixed by welding.

A space 5 is formed between the arc electrode 1 and the spiral electrode 2. With such a configuration, the arc electrode 1 and the spiral electrode 2 are electrically connected at their outer peripheral portions. In other words, the brim portion 52 and the side surface portion 53 (these are shown in FIG. 2B) of the arc electrode 1 and the outer peripheral portion 61 of the spiral electrode 2 are electrically connected.

The spiral electrode 2 and the rod 3 are connected by a rod connecting portion 101. The rod connecting portion 101 is formed by inserting the tip end portion of the rod 3 into the through hole 63 (FIG. 3B) of the spiral electrode 2. In this case, the spiral electrode 2 is fixed by cutting a screw on the inner wall surface of the through hole 63 (FIG. 3B) and the side surface of the tip portion of the rod 3. The fixing method is not limited to screws, and silver brazing, welding, or the like may be used. The through hole 51 is provided at a position facing the rod connecting portion 101.

With the above configuration, the current generated between the arc electrode 1 and the rod 3 passes through the outer peripheral portions of the arc electrode 1 and the spiral electrode 2, and passes through the current passage 26 and the annular portion 62 of the spiral electrode 2 and the rod connecting portion 101. It is designed to pass through. Since the arc electrode 1 is not in contact with the middle of the current passage 26, a current flows in the entire region of the current passage 26, and a magnetic field is generated from the entire region of the current passage 26. Further, since the spiral electrode 2 is covered with the arc electrode 1 except for the portion of the through hole 51, it is possible to prevent the arc from directly reaching the spiral electrode 2.

In FIG. 4, the diameter of the rod 3 and the diameter of the rod connecting portion 101 are equal to each other, but the present invention is not limited to this, and these diameters may be different. It is desirable that the diameter of the rod 3 is larger than the diameter of the rod connecting portion 101 because it is strong against an impact when opening and closing (particularly closing) the fixed side contactor and the movable side contactor.

FIG. 5 is a schematic cross-sectional view showing the overall configuration of the gas-insulated switch.

This figure shows a state in which the fixed-side contactor and the movable-side contactor of the gas-insulated switch are in contact with each other, that is, a closed pole state.

In this figure, both the fixed-side contactor and the movable-side contactor have a rod, an arc electrode, and a spiral electrode. The arc electrode of the fixed-side contactor is arranged between the spiral electrode of the fixed-side contactor and the movable-side contactor (another contactor). The arc electrode of the movable side contactor is arranged between the spiral electrode of the movable side contactor and the fixed side contactor (another contactor).

The fixed side contact and the movable side contact are installed in the closed container 6. Inside the closed container 6, a gas compartment is formed by an insulating spacer 7. Insulating gas is sealed in the gas compartment. As the insulating gas, negative gas such as SF _6, dry air, nitrogen, carbon dioxide, _SF 6 / _{N 2} mixed gas containing negative gas, such as _N 2 / _{O 2} mixed gas containing no negative gas is Used.

An embedded conductor 8 is installed in the center of the insulating spacer 7 in a state of being electrically insulated from the closed container 6. High-voltage conductors 9 and 10 are arranged to face each other on the embedded conductor 8 with a predetermined insulation distance. Shields 11 and 12 for electric field relaxation are provided on the facing portions of the high voltage conductors 9 and 10, respectively. The mover 13 arranged on the high voltage conductor 10 side is configured to be movable on the axis thereof via the insulating operation rod 14 by an external actuator (not shown). Further, the high voltage conductor 9 is provided with a fixed side main contactor 15. A movable side main contact 16 is provided inside the electric field relaxation shield 12 on the high voltage conductor 10 side.

A gantry 17 for fixing the rod 3 is arranged on the high-voltage conductor 9 side of the fixed-side contactor. The gantry 17 is made of metal and is slidably in contact with the inner peripheral surface of the fixed-side main contactor 15. Therefore, the fixed-side main contact 15 is electrically connected to the rod 3 via the gantry 17. Further, a spring 18 is installed between the gantry 17 and the high voltage conductor 9.

In this figure, since the pole is closed, the electrical connection state of the high voltage conductor 9, the fixed side main contact 15 and the movable side 13 and the movable side main contact 16 is maintained.

FIG. 6 is an enlarged view of a main part of FIG.

In FIG. 6, a fixed-side arc electrode 1a and a fixed-side spiral electrode 2a are installed at the end of the rod 3 fixed to the gantry 17. On the other hand, a movable side arc electrode 1b and a movable side spiral electrode 2b are installed at the tip of the movable element 13. In the closed pole state shown in this figure, the fixed side arc electrode 1a and the movable side arc electrode 1b are in contact with each other and are electrically connected. In this case, the tip of the mover 13 enters the inside of the electric field relaxation shield 11 and comes into contact with the fixed-side main contactor 15. As a result, a current passage for the high voltage conductor 9, the fixed side main contact 15, the mover 13, the movable side main contact 16, and the high voltage conductor 10 is formed. Further, the spring 18 is in a compressed and urged state.

Next, the current cutoff operation of the gas-insulated switch will be described.

When the insulating operation rod 14 is rotated in the clockwise direction in the figure by an external controller (not shown) to apply the opening operation force from the closed state of FIG. 5, the mover 13 moves in the right opening direction. Along with this, the movable element 13 is separated from the fixed side main contact element 15.

However, even if the mover 13 is separated, the gantry 17 moves together with the spring 18. Along with this, the rod 3, the fixed side spiral electrode 2a, and the fixed side arc electrode 1a fixed to the gantry 17 move following the operation of the mover 13. Therefore, the fixed-side arc electrode 1a continues to be in contact with the movable-side arc electrode 1b attached to the tip of the mover 13. As a result, even if the mover 13 is separated, the contact between the fixed side arc electrode 1a and the movable side arc electrode 1b is maintained. Therefore, when the fixed-side main contact 15 and the mover 13 are separated from each other, no arc is generated. Therefore, the fixed-side main contact 15 and the mover 13 do not need any special measures to prevent the influence of the arc heat.

FIG. 7 shows a state in which an arc is generated during the opening of the gas-insulated switch of FIG.

As shown in FIG. 7, since the gantry 17 is configured to be stopped by the stopper of the fixed-side main contact 15, the fixed-side arc electrode 1a stops when it moves to the vicinity of the opening of the electric field relaxation shield 11. do. Since the opening operation of the mover 13 continues even after that, the fixed side arc electrode 1a and the movable side arc electrode 1b are separated from each other, and an arc 19 is generated between them.

FIG. 8 is an exploded perspective view showing a current in a state where an arc is generated in the contacts of this embodiment.

In this figure, the fixed side arc electrode 1a, the fixed side spiral electrode 2a, and the rod 3 are shown.

As shown in this figure, the current I flows from the rod 3 to the fixed side arc electrode 1a via the start point 21, the current passage 26, and the end point 22 of the fixed side spiral electrode 2a. At the fixed side arc electrode 1a, an arc 19 is generated. The arc 19 flows as a current I substantially perpendicular to the surface of the fixed-side arc electrode 1a.

At this time, since the current I flows through the fixed-side spiral electrode 2a along the current passage 26, in the region where the arc 19 is generated in the upper part of the figure of the fixed-side arc electrode 1a, the fixed-side arc electrode 1a A magnetic field B is formed toward the outer peripheral portion in the radial direction. As a result, a magnetic driving force F (= I × B) acts on the arc 19. As a result, the arc 19 rotates about the central axis of the fixed-side arc electrode 1a.

When the direction of the current I is opposite to the direction shown in FIG. 8, the direction of the current I flowing through the current passage 26 is also opposite. In this case, since the magnetic field B is also in the opposite direction, the direction of the magnetic driving force F does not change.

FIG. 9 schematically shows a current and a magnetic field in a state where an arc is generated in the contacts of this embodiment.

The principle of magnetic drive of the arc will be described in more detail with reference to this figure.

In this figure, the axis Z is a common central axis of the fixed side arc electrode 1a and the movable side arc electrode 1b, and the axis R is the radius of the fixed side arc electrode 1a and the movable side arc electrode 1b orthogonal to the axis Z. The axis of direction. The current passage 26 constituting the concave surface of the fixed side spiral electrode 2a and the movable side spiral electrode 2b has a spiral shape in the same direction when viewed from the origin of the axis Z. Therefore, the magnetic fields B generated by the currents of the fixed side spiral electrode 2a and the movable side spiral electrode 2b are in the same direction.

In this figure, the fixed-side arc electrode 1a and the movable-side arc electrode 1b are arranged so as to face each other with the axis Z as the center. The current I flows from the rod 3 to the fixed side arc electrode 1a via the current passage 26 of the fixed side spiral electrode 2a, and flows as an arc 19 between the fixed side arc electrode 1a and the movable side arc electrode 1b. .. Then, the current I flows from the movable side arc electrode 1b to the movable element 13 via the current passage 26 of the movable side spiral electrode 2b.

In the current passage 26 of the fixed-side spiral electrode 2a, a current I flows in the direction above the axis Z toward the reader of the drawing and below the axis Z in the direction away from the reader in the drawing. On the other hand, in the current passage 26 of the movable side spiral electrode 2b, a current I flows in the upper part of the axis Z in the direction away from the reader of the drawing and in the lower part of the axis Z in the direction toward the reader of the drawing.

The current I flowing through the fixed-side spiral electrode 2a and the movable-side spiral electrode 2b forms a magnetic field B from the axis Z toward the outer peripheral portion in the radial direction of the fixed-side arc electrode 1a. Since the arc 19 is a current I from the fixed side arc electrode 1a to the movable side arc electrode 1b, a magnetic driving force F acts on the arc 19.

According to the configuration of this figure, for the arc 19, the fixed side spiral electrode 2a is covered by the fixed side arc electrode 1a, and the movable side spiral electrode 2b is covered by the movable side arc electrode 1b. It is possible to prevent the generation of a direct arc in the movable side spiral electrode 2b. Further, in the fixed side spiral electrode 2a and the movable side spiral electrode 2b, since the arc heat is blocked by the fixed side arc electrode 1a and the movable side arc electrode 1b, damage due to the arc heat can be prevented. As a result, stable energization performance and magnetic driving force can be maintained for a long period of time.

FIG. 10 is a graph showing the distribution of the magnetic field in the radial direction generated by the current in the spiral electrode of the contact of this embodiment. The horizontal axis is the axis R in FIG. 9, and the vertical axis is the position where Z = 0 in FIG. 9, that is, the distance to the fixed arc electrode 1a and the distance to the movable arc electrode 1b are equal (intermediate position). The magnetic field B in the radial direction is taken. In addition, in order to clarify the actual position corresponding to the horizontal axis, a cross-sectional view of the contact is also shown.

The spiral electrode 2 shown in the cross-sectional view has a spiral current passage 26 from the start point 21 to the end point 22, and a current I flows along the spiral electrode 2.

As shown in FIG. 10, the magnetic field B becomes zero on the central axis (R = 0), but the magnetic field B is generated in the region 24 closer to the outer periphery of the arc electrode 1 than the wall surface position 23 of the through hole 51 of the arc electrode 1. appear.

In the opening operation, the electric field when the two arc electrodes in contact start to separate is concentrated in the vicinity of the contacted portion, and an arc is likely to be generated in the region in the vicinity thereof. On the other hand, in the region of the through hole 51, the electric field is weak and it is difficult for an arc to occur. Therefore, the magnetic field B can be generated in the region where the arc is likely to be generated, and the magnetic driving force for the arc can be secured. Further, since the arc is not generated in the region where the magnetic field B is weak, the stagnation of the arc can be prevented and the breaking performance can be improved.

Since the strength of the magnetic field B depends on the number of turns of the current passage 26, the magnetic driving force can be increased by increasing the number of turns of the current passage 26.

The diameter of the through hole 51 shall be at least twice the distance from the central axis of the innermost part of the spiral of the current passage 26 (minimum radius of the spiral) corresponding to the starting point 21 of the spiral-shaped current passage 26. Is preferable. This is to prevent an arc from being generated in a region where the magnetic field B is weak in the arc electrode 1. However, if the diameter of the through hole 51 is too large, the possibility of an arc being generated toward the current passage 26 of the spiral electrode 2 increases. Therefore, the diameter of the through hole 51 is the first winding from the inside of the spiral of the current passage 26. It is preferable that the distance from the central axis of the end portion (the portion farthest from the central axis) near the outer periphery of the above is twice or less.

As described above, in this embodiment, most of the spiral electrode 2 of the contact is covered with the arc electrode 1, and the arc electrode 1 and the spiral electrode 2 are electrically connected at the outer peripheral portions thereof. When an arc is generated, it is possible to prevent the arc from coming into contact with the spiral electrode 2 and to allow a current to flow through the entire current passage 26 of the spiral electrode 2. Further, by providing the through hole 51, it is possible to prevent the arc from being generated in the region where the magnetic field B is weak, and it is possible to apply a magnetic driving force to the generated arc to rotate the arc. As a result, it is possible to promote the extinction of the arc and maintain stable current cutoff performance.

FIG. 11 is a cross-sectional view of a main part showing an open pole state of the gas-insulated switch of this embodiment.

In this figure, in the state where the opening operation is completed, the mover 13 is housed in the electric field relaxation shield 12, and the movable arc electrode 1b is stopped at the position of the opening of the electric field relaxation shield 12. There is. The fixed-side arc electrode 1a and the movable-side arc electrode 1b have a shape in which an electric field is more easily concentrated than the tip of the mover 13, but the fixed-side arc electrode 1a and the movable-side arc electrode 1b are stopped in the open pole state. By aligning the positions with the positions of the openings of the electric field relaxation shields 11 and 12, respectively, the electric field around the fixed side arc electrode 1a and the movable side arc electrode 1b is suppressed to a low level, and the insulation between the arc electrodes is maintained. Can be done.

FIG. 12 is a cross-sectional view of a main part showing the contactor of the second embodiment.

Hereinafter, only the differences between this embodiment and the first embodiment will be described.

In this figure, an insulating member 25 is provided between the arc electrode 1 and the spiral electrode 2. The electrical connection between the outer peripheral portion of the arc electrode 1 and the outer peripheral portion of the spiral electrode 2 is maintained. It is desirable that the insulating member 25 is made of polytetrafluoroethylene (PTFE) or the like.

As a result, the rod connecting portion 101, which is the central portion of the spiral electrode 2, is covered with the insulating member 25, and the generation of an arc toward the spiral electrode 2 (rod connecting portion 101) can be reliably prevented. Further, when the gas-insulated switchgear is changed from the open electrode state to the closed electrode state, the impact propagating from the arc electrode 1 to the spiral electrode 2 can be alleviated, and the durability can be improved.

FIG. 13 is a cross-sectional view of a main part showing an open pole state of the gas-insulated switch of the third embodiment.

Hereinafter, only the differences between this embodiment and the first embodiment will be described.

In this figure, a movable side arc electrode 1b is attached to the tip of the movable element 13. The movable side spiral electrode 2b shown in FIG. 11 is not provided.

Even with such a configuration, the arc receives a magnetic driving force from the magnetic field generated by the current of the fixed-side spiral electrode 2a, so that the arc can be rotated. When the magnetic driving force is insufficient, the magnetic driving force can be increased by increasing the number of turns of the current passage 26 (FIG. 4) of the fixed side spiral electrode 2a.

FIG. 14 is a cross-sectional view of a main part showing an open pole state of the gas-insulated switch of the fourth embodiment.

Hereinafter, only the differences between this embodiment and the first embodiment will be described.

In this figure, an insulating support member 71 is provided between the fixed-side spiral electrode 2a and the gantry 17. In other words, the support member 71 is arranged on the surface opposite to the side where the fixed side contactor and the movable side contactor of the fixed side spiral electrode 2a come into contact with each other. It is desirable that the support member 71 is made of polytetrafluoroethylene (PTFE) or the like. In this embodiment, the fixed-side arc electrode 1a is not essential as long as the fixed-side spiral electrode 2a has sufficient arc resistance.

As a result, it is possible to prevent deformation of the fixed-side spiral electrode 2a due to an impact from the fixed-side arc electrode 1a when the gas-insulated switchgear is changed from the open-pole state to the closed-pole state, and the durability can be improved. can.

Although not shown, an insulating member may be provided between the movable side spiral electrode 2b and the movable element 13. As a result, deformation of the movable side spiral electrode 2b can be prevented, and durability can be improved.

In the above embodiment, the case where the approximate shapes of the arc electrode and the spiral electrode are disk-shaped has been described, but the shapes of the arc electrode and the spiral electrode are not limited to this, and are square or rectangular. It may be a plate-shaped member having a shape, an ellipse shape, or the like.

1: Arc electrode, 1a: Fixed arc electrode, 1b: Movable arc electrode, 2: Spiral electrode, 2a: Fixed spiral electrode, 2b: Movable spiral electrode, 3: Rod, 4: Spiral groove, 5: Space , 6: Closed container, 7: Insulation spacer, 8: Embedded conductor, 9, 10: High voltage conductor, 11, 12: Shield for electric current relaxation, 13: Movable element, 14: Insulation operation rod, 15: Fixed side main contact Child, 16: movable side main contactor, 17: mount, 18: spring, 19: arc, 21: start point, 22: end point, 25: insulating member, 26: current passage, 71: support member.

Claims (9)

With a fixed side contactor and a movable side contactor,
At least one of the fixed-side contactor and the movable-side contactor has a rod, an arc electrode, and a spiral electrode.
The arc electrode is placed between the spiral electrode and another contact.
The arc electrode and the spiral electrode are electrically connected at their outer peripheral portions, and are electrically connected to each other.
The arc electrode has a through hole and has a through hole.
The spiral electrode and the rod are connected by a rod connection portion.
The through hole is provided, et al are at a position facing the rod connecting portion,
The spiral electrode has a planar spiral shape from the outer peripheral portion to the rod connecting portion.
A gas-insulated switchgear in which the diameter of the through hole of the arc electrode is equal to or larger than the diameter of the rod connection portion. The gas-insulated switchgear according to claim 1, wherein the arc electrode is made of a metal having arc resistance. The gas-insulated switchgear according to claim 1 or 2, wherein a space is formed between the arc electrode and the spiral electrode. The gas-insulated switchgear according to any one of claims 1 to 3, wherein a spiral groove forming a gap in the conductor portion is formed in the spiral electrode from the outer peripheral portion toward the rod connecting portion. .. The gas-insulated switchgear according to any one of claims 1 to 4 , wherein the spiral electrode has an annular portion to which the rod is connected. The spiral electrode is fixed to the rod and
The gas-insulated switchgear according to any one of claims 1 to 5 , wherein the diameter of the through hole of the arc electrode is equal to or larger than the diameter of the rod. The gas-insulated switchgear according to any one of claims 1 to 6 , wherein an insulating member is arranged between the arc electrode and the spiral electrode. The gas-insulated switchgear according to any one of claims 1 to 7 , wherein the spiral electrode is provided only on the fixed-side contactor. On the opposite side of the fixed-side contact and said movable contact is in contact side before Symbol spiral electrodes, insulating support member are disposed, any one of the preceding claims The gas-insulated switchgear described in.

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