JP7653889B2 - Gas insulated switchgear - Google Patents

Description

An embodiment of the present invention relates to a gas-insulated switchgear.

Gas-insulated switchgear is used to interrupt the current flowing through the power supply lines of a power system. The gas-insulated switchgear is placed on the power supply lines to interrupt the current flowing when disconnecting the system in which the fault occurred in the event of a system fault or when switching between systems. The gas-insulated switchgear has a pair of electrodes arranged to face each other in an airtight container filled with insulating gas. This pair of electrodes is driven to open and close by a drive unit arranged outside the gas-insulated switchgear. When the gas-insulated switchgear is in an open-contact state, the pair of electrodes is driven by the drive unit and mechanically separated. However, because the voltage in the power system is high, the interrupting current continues to flow due to arc discharge even after the pair of electrodes is mechanically separated.

As a gas-insulated switchgear, there is a gas-insulated switchgear of a magnetic field arc-extinguishing type that generates a magnetic flux interlinked with the arc and rotates and cools the arc to extinguish it. Here, generally, each electrode of the gas-insulated switchgear is provided with a current-carrying contact and an arc contact that are mutually conductive. The current-carrying contacts of the pair of electrodes contact each other in a closed state, and current flows between the pair of electrodes. The arc contacts of the pair of electrodes contact each other from the closed state to the early stage of the opening operation, and current flows between the pair of electrodes. Then, during the opening operation, the opening of the pair of arc contacts is delayed compared to the opening of the pair of current-carrying contacts, and an arc discharge occurs between the arc contacts during the opening operation. For example, in a gas-insulated switchgear of a magnetic field arc-extinguishing type, a magnetic flux is generated using a current flowing through the arc contact. Specifically, a magnetic field generating unit such as a coil is provided in the arc contact, and the interrupting current that flows through the arc contact in association with the arc discharge is passed through the magnetic field generating unit to generate a magnetic flux. In this case, the structure of the arc contact may become complicated by providing an insulating section so that the interrupting current flows through the magnetic field generating section.

Special Publication No. 1-24334

The problem that this invention aims to solve is to provide a gas-insulated switchgear with magnetic arc extinction that can suppress the complexity of the structure.

The gas-insulated switchgear of the embodiment has a contact section, an arc contact, a current path member, and a magnetic flux generating member. The contact section is disposed in an airtight container filled with insulating gas. The arc contact is disposed in the airtight container. The arc contact contacts the contact section in a closed state. The arc contact is separated from the contact section during an opening operation, and an arc discharge is generated between the contact section and the arc contact. The current path member is disposed in the airtight container. The current path member is provided separately from the arc contact. The current path member has a current contact. The current contact contact contacts the contact section in a closed state. The current contact is separated from the contact section earlier than the arc contact during an opening operation. The current path member forms a current path that passes through the current contact in a closed state. The magnetic flux generating member is provided separately from the arc contact and the current path member. The magnetic flux generating member is coupled and electrically connected to the arc contact and the current path member. The magnetic flux generating member generates a magnetic flux that interlinks with the arc when current is applied.

1 is a longitudinal sectional view showing a gas-insulated switchgear according to a first embodiment; FIG. 2 is a vertical cross-sectional view showing the movable contact portion of the first embodiment. FIG. 4 is a diagram showing the movable contact portion of the first embodiment as viewed in the separation direction. FIG. 2 is a longitudinal sectional view showing the gas insulated switchgear of the first embodiment during a contact opening operation. FIG. 2 is a longitudinal sectional view showing the gas insulated switchgear of the first embodiment during a contact opening operation. FIG. 11 is a vertical cross-sectional view showing a movable contact portion of a modified example according to the first embodiment. FIG. 13 is a view showing a movable contact portion of a modified example according to the first embodiment, viewed in the separation direction. FIG. 11 is a vertical cross-sectional view showing a movable contact portion of the second embodiment. FIG. 11 is a view showing a movable contact portion of the second embodiment as viewed in the separation direction. FIG. 13 is a vertical cross-sectional view showing a movable contact portion of a first modified example according to the second embodiment. FIG. 13 is a vertical cross-sectional view showing a movable contact portion of a second modified example according to the second embodiment. FIG. 11 is a vertical cross-sectional view showing a movable contact portion according to a third embodiment. FIG. 13 is a vertical cross-sectional view showing a movable contact portion of a modified example according to the third embodiment. FIG. 13 is a vertical cross-sectional view showing a movable contact portion of the fourth embodiment. FIG. 13 is a vertical cross-sectional view showing a movable contact portion of the fifth embodiment. FIG. 13 is a vertical cross-sectional view showing a movable contact portion of a first modified example according to the fifth embodiment. FIG. 13 is a vertical cross-sectional view showing a movable contact portion of a second modified example according to the fifth embodiment. FIG. 13 is a longitudinal sectional view showing a main part of a gas-insulated switchgear according to a sixth embodiment. FIG. 13 is a longitudinal sectional view showing a main part of a gas-insulated switchgear according to a seventh embodiment. FIG. 13 is a longitudinal sectional view showing a main part of a gas-insulated switchgear according to an eighth embodiment. FIG. 13 is a longitudinal sectional view showing a main part of a gas-insulated switchgear according to a ninth embodiment.

The gas-insulated switchgear of the embodiment will be described below with reference to the drawings. In the following description, components having the same or similar functions will be given the same reference numerals. Furthermore, duplicate descriptions of those components may be omitted.

First Embodiment
FIG. 1 is a vertical sectional view showing a gas-insulated switchgear according to a first embodiment.
1, the gas-insulated switchgear 1 is a switchgear for switching an electric circuit of a power system. The gas-insulated switchgear 1 includes a sealed container 10 filled with insulating gas, and a fixed unit 20 and a movable unit 40 disposed within the sealed container 10.

The sealed container 10 has an internal space in which the current flowing through the electric circuit is interrupted. The sealed container 10 comprises a metal tube 11 with both ends open, and insulating spacers 12 joined to the edges of both ends of the opening of the metal tube 11. The metal tube 11 is grounded.

The insulating spacers 12 are hermetically joined to the entire periphery of the opening edge of the metal tube 11. The insulating spacers 12 seal the inside of the sealed container 10. The insulating spacers 12 are made of an insulating material except for the center. The insulating spacer 12 has electrodes in its center that connect to the conductors 3 and 4 inside the sealed container 10. The conductors 3 and 4 are each connected to, for example, a power transmission line via the electrodes of the insulating spacer 12.

The insulating gas is a gas with excellent arc-extinguishing and insulating properties, such as sulfur hexafluoride (SF ₆ ) gas. However, the insulating gas may be a substance with a smaller global warming potential than sulfur hexafluoride. Examples of substances with a smaller global warming potential than sulfur hexafluoride include air, carbon dioxide, oxygen, nitrogen, and mixtures thereof.

The fixed unit 20 and the movable unit 40 constitute a part of an electric circuit. The fixed unit 20 has a fixed contact portion 23 that is electrically connected to the first conductor 3. The movable unit 40 has a movable contact portion 43 that is electrically connected to the second conductor 4. The gas-insulated switchgear 1 opens and closes an electric circuit and conducts or interrupts a current by bringing the fixed contact portion 23 and the movable contact portion 43 into contact with or separating from each other. In the following description, the state in which the fixed contact portion 23 and the movable contact portion 43 are in contact with each other is referred to as a closed state, and the state in which the fixed contact portion 23 and the movable contact portion 43 are separated from each other is referred to as an open state. In addition, among the closed states, the state that is applied in a steady state is particularly referred to as a closed state. In addition, among the open states, the state in which the current interruption operation is completed is particularly referred to as an interruption state. In addition, the operation of opening the fixed contact portion 23 and the movable contact portion 43 from each other from the closed state to the interruption state is referred to as an opening operation. In the following explanation of the fixed contact portion 23 and the movable contact portion 43, unless otherwise specified, the fixed contact portion 23 and the movable contact portion 43 will be described in the closed state.

The fixed unit 20 and the movable unit 40 each include a plurality of cylindrical members. The cylindrical members are arranged with a common central axis C. The fixed unit 20 and the movable unit 40 are arranged to face each other in the axial direction of the axis C. In the following description, the axial direction of the axis C is simply referred to as the axial direction. The direction going around the axis C is referred to as the circumferential direction. The direction perpendicular to the axis C is referred to as the radial direction. The axial direction in which the movable unit 40 is displaced relative to the fixed unit 20 during the contact opening operation is defined as the opening direction.

The fixed unit 20 includes a shield 21 and a fixed contact portion 23. The shield 21 and the fixed contact portion 23 are formed symmetrically with respect to the axis C.

The shield 21 is formed in a cylindrical shape. The shield 21 is formed in a cylindrical shape with a bottom and is open in the separation direction. The shield 21 is made of a metal material. The shield 21 is electrically connected to the first conductor 3. In the illustrated example, the bottom of the shield 21 is directly connected to the first conductor 3.

The fixed contact portion 23 includes a fixed current-carrying contact 30 and a fixed arc contact 35 .
The fixed current-carrying contactor 30 is disposed along the circumferential direction. For example, the fixed current-carrying contactor 30 is formed in a circular ring shape coaxial with the shield 21. The fixed current-carrying contactor 30 is formed of a metal material. The fixed current-carrying contactor 30 is electrically connected to the shield 21. In this embodiment, the fixed current-carrying contactor 30 is directly connected to the shield 21. Furthermore, in this embodiment, the fixed current-carrying contactor 30 is connected to a portion of the inner peripheral surface of the shield 21 near the opening end. In this case, the fixed current-carrying contactor 30 protrudes radially inward from the inner peripheral surface of the shield 21, for example, and is capable of contacting a movable current-carrying contactor 50 described later. The fixed current-carrying contactor 30 is electrically connected to the first conductor 3 via the shield 21.

The fixed arc contactor 35 is formed in a cylindrical shape coaxial with the fixed current-carrying contactor 30. The fixed arc contactor 35 is disposed inside the shield 21. The fixed arc contactor 35 is disposed in the opening direction from the bottom of the shield 21. The fixed arc contactor 35 is formed of a metal material. The fixed arc contactor 35 is electrically connected to the shield 21. In this embodiment, the end of the fixed arc contactor 35 on the bottom side of the shield 21 is directly connected to the bottom of the shield 21. The fixed arc contactor 35 is electrically connected to the first conductor 3 via the shield 21. The end of the fixed arc contactor 35 in the opening direction protrudes radially outward.

The movable unit 40 is disposed in an opening direction relative to the fixed unit 20. The movable unit 40 includes a shield 41, a movable contact portion 43, an operating rod 70, and an operating mechanism 80. The shield 41, the movable contact portion 43, and the operating rod 70 are formed symmetrically with respect to the axis C.

The shield 41 is formed in a cylindrical shape. The shield 41 is formed in a cylindrical shape with a bottom, and is open on the side opposite the opening direction. The edge of the opening of the shield 41 is arranged to be spaced apart in the axial direction from and facing the edge of the opening of the shield 21 of the fixed unit 20. The shield 41 is formed of a metal material. The shield 41 is electrically connected to the second conductor 4. In the illustrated example, the bottom of the shield 41 is directly connected to the second conductor 4.

A slider 42 that slides against the movable contact portion 43 is provided on the inner peripheral surface of the shield 41. The slider 42 is made of a metal material. The slider 42 is electrically connected to the main body of the shield 41. The slider 42 is arranged along the circumferential direction. For example, the slider 42 is formed in a circular ring shape that is coaxial with the shield 41. The slider 42 is provided on a portion of the inner peripheral surface of the shield 41 near the opening end. For example, the slider 42 protrudes radially inward from the inner peripheral surface of the shield 41.

Fig. 2 is a vertical cross-sectional view showing the movable contact portion of the first embodiment, and Fig. 3 is a view showing the movable contact portion of the first embodiment as viewed in the separation direction.
As shown in FIGS. 2 and 3 , the movable contact portion 43 includes a movable current-carrying contact 50 , a movable arc contact 55 , and a current-carrying coil 60 .

The movable current contactor 50 is formed in a cylindrical shape that opens on the opposite side to the opening direction. The movable current contactor 50 has a peripheral wall portion 50a extending in the axial direction and a bottom portion 50b extending radially inward from the peripheral wall portion 50a. The peripheral wall portion 50a extends in the opening direction from an opening end portion 50c on the opposite side of the opening direction of the movable current contactor 50. The bottom portion 50b is arranged at a distance in the opening direction from the opening end portion 50c. The movable current contactor 50 is formed of a metal material. The movable current contactor 50 is inserted into the shield 41 so that at least the end portion in the opening direction is always positioned inside the shield 41. The movable current contactor 50 is displaceable along the axial direction inside the shield 41. The outer peripheral surface of the movable current contactor 50 is in sliding contact with the slider 42 of the shield 41. As a result, the movable current-carrying contact 50 is always electrically connected to the shield 41. The movable current-carrying contact 50 is electrically connected to the second conductor 4 through the shield 41.

The movable current-carrying contactor 50 is formed so that the open end 50c can be inserted inside the fixed current-carrying contactor 30. The outer diameter of the peripheral wall portion 50a of the movable current-carrying contactor 50 is approximately equal to the inner diameter of the fixed current-carrying contactor 30. The movable current-carrying contactor 50 is in contact with the fixed current-carrying contactor 30 and is electrically connected to the fixed current-carrying contactor 30.

The movable arc contactor 55 is formed in a cylindrical shape coaxial with the movable current contactor 50. Both ends of the movable arc contactor 55 are open in the axial direction. The outer diameter of the movable arc contactor 55 is smaller than the inner diameter of the open end 50c of the movable current contactor 50. The movable arc contactor 55 is arranged inside the open end 50c of the movable current contactor 50 when viewed from the axial direction. The movable arc contactor 55 overlaps the open end 50c of the movable current contactor 50 when viewed from the radial direction. The movable arc contactor 55 is surrounded by the movable current contactor 50. The movable arc contactor 55 is arranged at a radial interval around the entire circumference of the movable current contactor 50. The movable arc contactor 55 is formed of a metal material. The movable arc contactor 55 is electrically connected to the movable current contactor 50. The movable arc contact 55 is provided separately from the movable current contact 50 and is supported by the movable current contact 50 via the current coil 60.

The movable arc contactor 55 is formed so that its tip on the side opposite to the opening direction can be inserted inside the shield 21 of the fixed unit 20. The inner diameter of the movable arc contactor 55 is approximately the same as the outer diameter of the fixed arc contactor 35. When inserted inside the shield 21, the movable arc contactor 55 is fitted over and comes into contact with the fixed arc contactor 35. The movable arc contactor 55 comes into contact with the fixed arc contactor 35 and is electrically connected to the fixed arc contactor 35.

The energizing coil 60 is provided separately from the movable energizing contact 50 and the movable arc contact 55. The energizing coil 60 is disposed inside the peripheral wall portion 50a of the movable energizing contact 50. The energizing coil 60 is disposed between the movable arc contact 55 and the bottom portion 50b of the movable energizing contact 50. The energizing coil 60 extends around the axis C. The energizing coil 60 extends in a spiral shape centered on the axis C. The energizing coil 60 is formed of a conductive material such as a metal material. The energizing coil 60 is coupled to and electrically connected to the movable arc contact 55 and the movable energizing contact 50. As a result, the energizing coil 60 electrically connects the movable arc contact 55 and the movable energizing contact 50.

The energized coil 60 has a first end 61 on the opposite side to the opening direction and a second end 62 in the opening direction. The first end 61 is directly connected to the edge of the movable arc contact 55 in the opening direction. The first end 61 is fastened to the movable arc contact 55 by a fastening member 63. The second end 62 is directly connected to a surface facing the opposite side to the opening direction in the bottom 50b of the movable energized contact 50. The second end 62 is fastened to the bottom 50b of the movable energized contact 50 by a fastening member 64. In this embodiment, the energized coil 60 extends less than 360° around the axis C. As a result, the energized coil 60 extends in an arc shape so as not to overlap when viewed from the axial direction. The energized coil 60 generates a magnetic flux when energized. The outer diameter of the energized coil 60 is smaller than the inner diameter of the peripheral wall portion 50a of the movable energized contact 50. The entire energized coil 60 overlaps the movable arc contact 55 when viewed from the axial direction. The energized coil 60 is not in contact with any member other than the movable arc contact 55, the bottom 50b of the movable energized contact 50, and the fastening members 63 and 64.

The operating rod 70 is made of a metal material. The operating rod 70 is disposed inside the shield 41. The operating rod 70 is connected to the movable conductive contact 50. The operating rod 70 extends in the opening direction from the connection to the movable conductive contact 50.

The operating mechanism 80 displaces the operating rod 70 in the axial direction. The operating mechanism 80 includes a drive unit 81 connected to the operating rod 70 and an electric motor 82 that drives the drive unit 81. The drive unit 81 is formed in an axial shape. The drive unit 81 is connected to the operating rod 70 inside the shield 41. The drive unit 81 displaces the operating rod 70 in the axial direction by rotating. The drive unit 81 is inserted into the through hole of the shield 41 and is airtightly inserted into the through hole of the sealed container 10. The drive unit 81 is connected to the electric motor 82 outside the sealed container 10. The electric motor 82 is fixedly disposed outside the sealed container 10 with respect to the sealed container 10. However, the operating mechanism 80 is not limited to this configuration and may be, for example, an electromagnetic repulsion mechanism.

Next, the interruption operation of the gas-insulated switchgear 1 will be described.
1 , in the closed state, the movable current-carrying contactor 50 is inserted into and in contact with the fixed current-carrying contactor 30, and the fixed arc contactor 35 is inserted into and in contact with the movable arc contactor 55. This establishes electrical continuity between the fixed unit 20 and the movable unit 40, forming an electrical path between the pair of conductors 3, 4. Of the electrical paths in the fixed unit 20, the electrical path that passes through the fixed current-carrying contactor 30 is formed in the fixed current-carrying contactor 30 and the shield 21. Of the electrical paths in the movable unit 40, the electrical path that passes through the movable current-carrying contactor 50 is formed in the movable current-carrying contactor 50 and the shield 41.

When the gas-insulated switchgear 1 interrupts current, it displaces the operating rod 70 in the opening direction, separating the fixed contact portion 23 and the movable contact portion 43 from each other. When the operating rod 70 is displaced in the opening direction, the movable contact portion 43 is displaced in the opening direction in conjunction with the operating rod 70.

4 and 5 are longitudinal sectional views showing the gas insulated switchgear of the first embodiment during a contact opening operation.
As shown in Fig. 4, when the operating rod 70 is displaced in the opening direction from the closed state, the movable current-carrying contact 50 opens from the fixed contact portion 23 earlier than the movable arc contact 55. As a result, the current path passing through the fixed current-carrying contact 30 in the fixed unit 20 is interrupted, and the current path passing through the movable current-carrying contact 50 in the movable unit 40 is interrupted. Meanwhile, since the fixed arc contact 35 and the movable arc contact 55 are in contact with each other and are conductive, a current path for an interrupting current is formed between the pair of conductors 3 and 4. In this state, the only current path between the pair of conductors 3 and 4 passes through the fixed arc contact 35, the movable arc contact 55, and the current-carrying coil 60.

As shown in FIG. 5, when the operating rod 70 is further displaced in the opening direction, the fixed arc contact 35 and the movable arc contact 55 are opened, and the state transitions from the closed state to the open state. When the fixed arc contact 35 and the movable arc contact 55 are opened, an arc discharge occurs between the fixed arc contact 35 and the movable arc contact 55. In this state, the only current path between the pair of conductors 3 and 4 is maintained, and an interrupting current continues to flow through the current-carrying coil 60.

When a current flows through the energized coil 60, the energized coil 60 functions as an air-core coil. The energized coil 60 generates a magnetic flux such that the magnetic field lines extending from the inside of the energized coil 60 due to the interruption current pass between the fixed arc contact 35 and the movable arc contact 55. The magnetic flux is interlinked with the arc generated between the fixed arc contact 35 and the movable arc contact 55. The plasma on the arc discharge path rotates in the circumferential direction due to the electromagnetic force. That is, the arc rotates in the circumferential direction between the fixed arc contact 35 and the movable arc contact 55 and is cooled by the surrounding insulating gas. As a result, the arc discharge is extinguished and the current is interrupted. Then, the gas-insulated switchgear 1 reaches a completely open state and completes the interruption operation.

As described above, the gas-insulated switchgear 1 of this embodiment includes an energized coil 60 that generates a magnetic flux that interlinks with the arc generated between the fixed arc contact 35 and the movable arc contact 55. The energized coil 60 is provided separately from the movable energized contact 50 and the movable arc contact 55, and is coupled and electrically connected to the movable energized contact 50 and the movable arc contact 55. According to this configuration, the energized coil 60 conducts the movable energized contact 50 and the movable arc contact 55, so that an interruption current flows through the energized coil 60 in a state in which an arc discharge is generated. This allows the energized coil 60 to generate a magnetic flux, so that the magnetic flux interlinks with the arc, thereby extinguishing the arc discharge. Here, since the energized coil 60 is coupled to the movable energized contact 50 and the movable arc contact 55, the structure of the movable arc contact 55 can be prevented from becoming complicated, compared to a configuration in which a means for generating a magnetic flux is provided within the movable arc contact. That is, compared to a configuration in which both ends of the movable arc contact are connected to each other via a current-carrying coil and an insulating member is provided in the middle of the movable arc contact to insulate both ends, the mechanical joints around the movable arc contact can be reduced and the structure of the movable arc contact can be simplified. Also, compared to a configuration in which the movable arc contact itself is formed into a coil shape, the structure of the movable arc contact can be simplified. Therefore, the complexity of the structure of the magnetic field extinction type gas-insulated switchgear 1 can be suppressed.

The surface of the energized coil 60, except for the joints with the movable arc contact 55 and the movable energized contact 50, may be insulated by coating with an insulating paint or by attaching an insulating tube. This can prevent current flow when the coil makes contact with itself due to vibration during opening operations. Even if a carbonized conductive path (tracking) is formed on the insulating coating of the energized coil 60, the windings of the energized coil 60 are insulated by insulating gas, so creeping current flow is suppressed.

The shape of each contact is not limited to the above-mentioned shape. For example, each contact may be arranged along the circumferential direction. That is, it may include a cylindrical contact, or a cylindrical contact with a slit at the tip. It may also include a contact that is divided in the circumferential direction.

A modification of the first embodiment will be described.
Fig. 6 is a vertical cross-sectional view showing a movable contact portion of a modified example according to the first embodiment. Fig. 7 is a view showing the movable contact portion of the modified example according to the first embodiment as viewed in the separation direction.
6 and 7, the movable contact portion 43 may include, instead of the current-carrying coil 60, a current-carrying coil 60A extending 360° or more around the axis C. This increases the magnetic flux generated by the current-carrying coil 60A, thereby improving the arc-extinguishing capability.

Second Embodiment
Fig. 8 is a vertical cross-sectional view showing the movable contact portion of the second embodiment. Fig. 9 is a view showing the movable contact portion of the second embodiment as viewed in the separation direction.
8 and 9 is different from the first embodiment in that a fixed portion 45A to which a movable current-carrying contact 50A and a movable arcing contact 55A are fixed to each other is provided on a movable contact portion 43A. Note that the configuration other than that described below is the same as that of the first embodiment.

As shown in Figures 8 and 9, the movable current contactor 50A has a bulge 51 that bulges radially inward at the end opposite the opening direction. The bulge 51 is located on the opposite side of the opening direction from the current coil 60 and is not in contact with the current coil 60. The inner surface of the bulge 51 extends in the axial direction with a constant radius of curvature. The inner surface of the bulge 51 is in close contact with the inner surface of the movable arc contactor 55A. The movable current contactor 50A directly supports the outer surface of the movable arc contactor 55A at the fixed portion 45A.

The fixed portion 45A includes a fastening member 46 that fastens the movable current contactor 50A and the movable arc contactor 55A. That is, the movable current contactor 50A and the movable arc contactor 55A are fixed to each other by the fastening force of the fastening member 46 at the fixed portion 45A. As a result, the fixed portion 45A fastens the movable current contactor 50A and the movable arc contactor 55A by a structure different from that of the current coil 60. The fastening member 46 is arranged so that the head fits into a recess formed on the outer circumferential surface of the movable current contactor 50A. The fastening member 46 is arranged so that the shaft does not protrude inside the movable arc contactor 55A. The fastening members 46 are arranged at equal angular intervals (90° intervals in this embodiment) around the axis C.

According to the present embodiment described above, in addition to the same advantageous effects as those of the first embodiment, the following advantageous effects are achieved.
The gas-insulated switchgear 1 of the present embodiment includes a fixed portion 45A, to which the movable arc contact 55A and the movable current-carrying contact 50A are fixed to each other, which is different from the current-carrying coil 60. With this configuration, the fixing strength of the movable arc contact 55A to the movable current-carrying contact 50A can be improved, and therefore durability against impact when the movable arc contact 55A is electrically connected to the fixed arc contact 35 can be further improved.

The movable current contactor 50A also directly supports the outer peripheral surface of the movable arc contactor 55A at the fixed portion 45A. This improves the radial fixing strength of the movable arc contactor 55A relative to the movable current contactor 50A.

A first modification of the second embodiment will be described.
FIG. 10 is a vertical cross-sectional view showing a movable contact portion of a first modified example according to the second embodiment.
10 differs from the second embodiment in that the fixed portion 45B includes a resistive film 47 interposed between the movable current-carrying contact 50A and the movable arc contact 55A. Note that the configuration other than that described below is the same as that of the second embodiment.

10, the resistive film 47 is in contact with the inner circumferential surface of the bulging portion 51 of the movable current-carrying contact 50A and the outer circumferential surface of the movable arc contact 55A. However, the resistive film 47 does not have to be arranged without gaps around the entire circumference, as long as it regulates the direct contact between the movable current-carrying contact 50A and the movable arc contact 55A. The resistive film 47 is formed of a material having a higher electrical resistivity than the material forming the current-carrying coil 60. The electrical resistance of the resistive film 47 is greater than the electrical resistance of the current-carrying coil 60. The resistive film 47 is formed by applying a material to at least one of the inner circumferential surface of the bulging portion 51 of the movable current-carrying contact 50A and the outer circumferential surface of the movable arc contact 55A. For example, the material forming the resistive film 47 is epoxy resin.

According to this modification, the flow of current between the movable current-carrying contact 50A and the movable arc contact 55A in the fixed portion 45B can be suppressed by the resistive film 47. This allows the interrupting current to flow more actively through the current-carrying coil 60, thereby increasing the magnetic flux generated by the current-carrying coil 60.

In this modified example, it is preferable that the fastening member 46 is made of a material having a higher electrical resistivity than the material that forms the current-carrying coil 60. This makes it possible to suppress the flow of electricity between the movable current-carrying contact 50A and the movable arc contact 55A through the fastening member 46.

A second modification of the second embodiment will be described.
FIG. 11 is a vertical cross-sectional view showing a movable contact portion of a second modified example according to the second embodiment.
11 differs from the second embodiment in that the fixed portion 45C includes an intermediate member 48 interposed between the movable current-carrying contact 50A and the movable arc contact 55A. Note that the configuration other than that described below is the same as that of the second embodiment.

11, the intermediate member 48 is formed in a cylindrical shape coaxial with the movable current-carrying contact 50A and the movable arc contact 55A. The intermediate member 48 is in contact with the inner peripheral surface of the bulging portion 51 of the movable current-carrying contact 50A and the outer peripheral surface of the movable arc contact 55A. The fastening member 46 penetrates the intermediate member 48. The intermediate member 48 is sandwiched and fixed between the movable current-carrying contact 50A and the movable arc contact 55A by the fastening force of the fastening member 46. However, the intermediate member 48 does not need to be arranged without gaps around the entire circumference, as long as it regulates the direct contact between the movable current-carrying contact 50A and the movable arc contact 55A. The intermediate member 48 is formed of a material having a higher electrical resistivity than the material forming the current-carrying coil 60. The electrical resistance of the intermediate member 48 is greater than the electrical resistance of the current-carrying coil 60.

According to this modified example, the intermediate member 48 can suppress the flow of current between the movable current-carrying contact 50A and the movable arc contact 55A in the fixed portion 45C. This allows the interrupting current to flow more actively through the current-carrying coil 60, thereby increasing the magnetic flux generated by the current-carrying coil 60.

As with the first modification of the second embodiment, in this modification, it is desirable that the fastening member 46 be made of a material with a higher electrical resistivity than the material that forms the current-carrying coil 60.

Third Embodiment
FIG. 12 is a vertical cross-sectional view showing a movable contact portion of the third embodiment.
In the second embodiment shown in Fig. 8, the movable current-carrying contact 50A and the movable arc contact 55A are fixed to each other at the fixed portion 45A by the fastening force of the fastening member 46. In contrast, the third embodiment shown in Fig. 12 differs from the second embodiment in that the movable current-carrying contact 50D and the movable arc contact 55D are fixed to each other by being screwed to each other at the fixed portion 45D. Note that the configuration other than that described below is the same as that of the second embodiment.

As shown in FIG. 12, an internal thread 52 is formed on the inner peripheral surface of the movable current contactor 50D. An external thread 56 is formed on the outer peripheral surface of the movable arc contactor 55D. The external thread 56 of the movable arc contactor 55D screws into the internal thread 52 of the movable current contactor 50D. As a result, the movable current contactor 50D directly supports and fixes the outer peripheral surface of the movable arc contactor 55D at the fixed portion 45D.

According to the present embodiment described above, in addition to the same advantageous effects as those of the second embodiment, the following advantageous effects are achieved.
In this embodiment, an internal thread 52 is formed on the inner peripheral surface of the movable current-carrying contactor 50D, and an external thread 56 is formed on the outer peripheral surface of the movable arc contactor 55D, which is screwed into the internal thread 52. This configuration can improve the axial fixing strength of the movable arc contactor 55D to the movable current-carrying contactor 50D.

A modification of the third embodiment will now be described.
FIG. 13 is a vertical cross-sectional view showing a movable contact portion of a modified example according to the third embodiment.
13, the fixed portion 45E may include a resistive film 47E interposed between the movable current-carrying contact 50D and the movable arc contact 55D, similar to the first modified example of the second embodiment. The resistive film 47E is in contact with the female thread 52 of the movable current-carrying contact 50D and the male thread 56 of the movable arc contact 55D. However, the resistive film 47E does not need to be disposed without gaps over the entire circumference, and it is sufficient that the resistive film 47E regulates the direct contact between the movable current-carrying contact 50D and the movable arc contact 55D.

According to this modification, the resistive film 47E can suppress the flow of current between the movable current-carrying contact 50D and the movable arc contact 55D in the fixed portion 45E. This allows the interrupting current to flow more actively through the current-carrying coil 60, thereby increasing the magnetic flux generated by the current-carrying coil 60.

Fourth Embodiment
FIG. 14 is a vertical cross-sectional view showing a movable contact portion of the fourth embodiment.
In the third embodiment shown in Fig. 12, the movable current-carrying contact 50D and the movable arcing contact 55D are fixed to each other by screwing them together at the fixed portion 45D. In contrast, the fourth embodiment shown in Fig. 14 differs from the third embodiment in that the movable current-carrying contact 50D and the movable arcing contact 55D are fixed to each other by screwing them together at the fixed portion 45F to the intermediate member 48F. Note that the configuration other than that described below is the same as that of the third embodiment.

As shown in FIG. 14, the fixed portion 45F includes an intermediate member 48F interposed between the movable energized contact 50D and the movable arc contact. The intermediate member 48F is formed in a cylindrical shape coaxial with the movable energized contact 50D and the movable arc contact 55D. A male thread 48a is formed on the outer peripheral surface of the intermediate member 48F. A female thread 48b is formed on the inner peripheral surface of the intermediate member 48F. The male thread 48a of the intermediate member 48F screws into the female thread 52 of the movable energized contact 50D. The female thread 48b of the intermediate member 48F screws into the male thread 56 of the movable arc contact 55D. As a result, the movable energized contact 50D and the movable arc contact 55D are fixed to each other at the fixed portion 45F. The intermediate member 48F is formed of a material having a higher electrical resistivity than the material forming the energized coil 60. The electrical resistance of the intermediate member 48F is greater than the electrical resistance of the energized coil 60.

According to the present embodiment described above, in addition to the same advantageous effects as those of the third embodiment, the following advantageous effects are achieved.
In this embodiment, since the intermediate member 48F is interposed between the movable current-carrying contact 50D and the movable arc contact 55D, the intermediate member 48F can suppress the current flow between the movable current-carrying contact 50D and the movable arc contact 55D at the fixed portion 45F. This makes it possible to more actively flow the breaking current to the current-carrying coil 60, thereby increasing the magnetic flux generated by the current-carrying coil 60.

Furthermore, since the movable current-carrying contact 50D is screwed to the intermediate member 48F, and the intermediate member 48F is screwed to the movable contact 55D, the axial fixing strength of the movable arc contact 55D relative to the movable current-carrying contact 50D can be improved.

Fifth Embodiment
FIG. 15 is a vertical cross-sectional view showing a movable contact portion of the fifth embodiment.
15, the fifth embodiment differs from the first embodiment in that a fixed portion 45G, to which a movable current-carrying contact 50 and a movable arcing contact 55G are fixed to each other, is provided on a movable contact portion 43G. Note that the configuration other than that described below is the same as that of the first embodiment.

As shown in FIG. 15, the movable arc contactor 55G is located at the end of the movable arc contactor 55G opposite the opening direction and has a tip 57 that contacts the fixed arc contactor 35, and a leg 58 that extends from the tip 57 in the opening direction. The movable arc contactor 55G is a single member in which the tip 57 and the leg 58 are continuously integrated. However, the movable arc contactor 55G may have a configuration in which the tip 57 and the leg 58 are provided separately from each other and fastened together. The tip 57 is formed in the same manner as the movable arc contactor 55 in the first embodiment. The first end 61 of the current-carrying coil 60 is joined to the edge of the tip 57 in the opening direction.

The leg 58 extends inside the energized coil 60. The leg 58 is not in contact with the energized coil 60. The leg 58 includes a flange 58a fixed to the movable energized contact 50 and a connecting portion 58b connecting the flange 58a and the tip 57. The connecting portion 58b is disposed inside the energized coil 60. The connecting portion 58b extends in the axial direction. The connecting portion 58b is formed in a cylindrical shape coaxial with the tip 57. The end of the connecting portion 58b opposite to the opening direction is connected to the inner periphery of the end face of the tip 57 in the opening direction. The flange 58a extends radially inward from the end of the connecting portion 58b in the opening direction. The flange 58a is formed in a disk shape that closes the opening of the connecting portion 58b. The flange 58a abuts against the bottom 50b of the movable conductive contact 50 from the side opposite the opening direction.

The fixed portion 45G includes a fastening member 46G that fastens the bottom portion 50b of the movable current contactor 50 and the flange 58a of the movable arc contactor 55G. That is, the movable current contactor 50 and the movable arc contactor 55G are fixed to each other at the fixed portion 45G by the fastening force of the fastening member 46G. The fastening member 46G is arranged along the axis C. The fastening member 46G is arranged so that its head fits inside the leg portion 58 of the movable arc contactor 55G.

According to the present embodiment described above, in addition to the same advantageous effects as those of the first embodiment, the following advantageous effects are achieved.
The gas-insulated switchgear 1 of the present embodiment includes a fixed portion 45G, to which the movable arc contact 55G and the movable current-carrying contact 50 are fixed to each other, and which is different from the current-carrying coil 60. With this configuration, the fixing strength of the movable arc contact 55G to the movable current-carrying contact 50 can be improved, and therefore durability against impact when the movable arc contact 55G is electrically connected to the fixed arc contact 35 can be further improved.

The movable arc contactor 55G has a tip 57 that is disposed inside the peripheral wall 50a of the movable current contactor 50 and contacts the fixed arc contactor 35, and a leg 58 that extends from the tip 57 in the opening direction, abuts against the bottom 50b of the movable current contactor 50, and is fixed to the bottom 50b. With this configuration, the movable arc contactor 55G is supported from the opening direction by the bottom 50b of the movable current contactor 50. This improves the fixing strength of the movable arc contactor 55G to the movable current contactor 50 in the opening direction.

In addition, the legs 58 extend inside the energized coil 60. This allows the legs 58 to function as the iron core of the energized coil 60. This allows the magnetic flux generated by the energized coil 60 to be increased.

The shape of the leg 58 of the movable arc contact 55G is not limited to the above shape. The leg needs only to extend from the tip 57 in the opening direction and be fixed to the bottom 50b of the movable current contact 50.

A first modification of the fifth embodiment will be described.
FIG. 16 is a vertical cross-sectional view showing a movable contact portion of a first modified example according to the fifth embodiment.
16 differs from the fifth embodiment in that a fixed portion 45H includes a resistive film 47H interposed between the movable current-carrying contact 50 and the movable arcing contact 55G. The resistive film 47H is formed in the same manner as the resistive film 47 in the first modified example of the second embodiment. The other configurations are the same as those in the fifth embodiment.

According to this modification, the resistive film 47H can suppress the flow of current between the movable current-carrying contact 50 and the movable arc contact 55G in the fixed portion 45H. This allows the interrupting current to flow more actively through the current-carrying coil 60, thereby increasing the magnetic flux generated by the current-carrying coil 60.

In this modified example, it is preferable that the fastening member 46G is made of a material having a higher electrical resistivity than the material that forms the current-carrying coil 60. This makes it possible to suppress the flow of electricity between the movable current-carrying contact 50 and the movable arc contact 55G through the fastening member 46G.

A second modification of the fifth embodiment will be described.
FIG. 17 is a vertical cross-sectional view showing a movable contact portion of a second modified example according to the fifth embodiment.
17 is different from the fifth embodiment in that the fixed portion 45I includes an intermediate member 48I interposed between the movable current-carrying contact 50 and the movable arcing contact 55G. Note that the configuration other than that described below is the same as that of the fifth embodiment.

As shown in FIG. 17, the intermediate member 48I is formed in a flat plate shape. The intermediate member 48I is formed in a disk shape with approximately the same diameter as the flange 58a of the movable arc contact 55G. The intermediate member 48I is formed of a material with a higher electrical resistivity than the material forming the energized coil 60. The intermediate member 48I is in contact with the bottom 50b of the movable energized contact 50 and the flange 58a of the movable arc contact 55G. The fastening member 46G penetrates the intermediate member 48I. The intermediate member 48I is sandwiched between the movable energized contact 50 and the movable arc contact 55G by the fastening force of the fastening member 46G.

According to this modification, the intermediate member 48I can suppress the passage of current between the movable current-carrying contact 50 and the movable arc contact 55G in the fixed portion 45I. This makes it possible to more actively pass an interrupting current through the current-carrying coil 60, thereby increasing the magnetic flux generated by the current-carrying coil 60.
In this modification, it is desirable that the fastening member 46G be made of a material having a higher electrical resistivity than the material from which the current-carrying coil 60 is made, as in the first modification of the fifth embodiment.

Sixth Embodiment
FIG. 18 is a vertical sectional view showing a main part of a gas-insulated switchgear according to the sixth embodiment.
In the first embodiment shown in Fig. 1, the movable contact portion 43 is provided with a current-carrying coil 60. In contrast, the sixth embodiment shown in Fig. 18 differs from the first embodiment in that the fixed contact portion 123 is provided with a current-carrying coil 160. Note that the configuration other than that described below is similar to that of the first embodiment.

As shown in FIG. 18, the gas-insulated switchgear 101 includes a fixed unit 120 and a movable unit 140 arranged in a sealed container 10 (see FIG. 1).

The fixed unit 120 includes a shield 121 and a fixed contact portion 123 .
The shield 121 is formed in a cylindrical shape. The shield 121 is open in the separation direction. The shield 121 includes a peripheral wall 121a extending in the axial direction and a bottom wall 121b extending radially inward from the peripheral wall 121a. The bottom wall 121b is disposed on the opposite side to the separation direction with a gap therebetween with respect to the opening edge of the peripheral wall 121a in the separation direction.

The fixed contact portion 123 includes a fixed current-carrying contact 130 , a fixed arc contact 135 , and a current-carrying coil 160 .
The fixed current-carrying contact 130 is disposed along the circumferential direction. For example, the fixed current-carrying contact 130 is formed in a circular ring shape coaxial with the shield 121. The fixed current-carrying contact 130 is formed of a metal material. The fixed current-carrying contact 130 is electrically connected to the shield 121. In this embodiment, the fixed current-carrying contact 130 is directly connected to the shield 121. Furthermore, in this embodiment, the fixed current-carrying contact 130 is connected to a portion of the inner peripheral surface of the shield 121 near the opening end. In this case, the fixed current-carrying contact 130 protrudes radially inward from the inner peripheral surface of the shield 121, for example, and is capable of contacting the movable current-carrying contact 150. The fixed current-carrying contact 130 is electrically connected to the first conductor 3 (see FIG. 1 ) via the shield 121.

The fixed arc contactor 135 is formed in a cylindrical shape. Both ends of the fixed arc contactor 135 are open in the axial direction. The fixed arc contactor 135 is arranged inside the shield 121. The fixed arc contactor 135 is arranged in the opening direction from the bottom wall 121b of the shield 121. The outer diameter of the fixed arc contactor 135 is smaller than the inner diameter of the fixed current-carrying contactor 130. The fixed arc contactor 135 is arranged inside the fixed current-carrying contactor 130 when viewed from the axial direction. The fixed arc contactor 135 overlaps the fixed current-carrying contactor 130 when viewed from the radial direction. The fixed arc contactor 135 is surrounded by the peripheral wall 121a of the shield 121 and the fixed current-carrying contactor 130. The fixed arc contactor 135 is arranged at a radial interval around the entire circumference with respect to the peripheral wall 121a of the shield 121 and the fixed current-carrying contactor 130. The fixed arc contact 135 is made of a metal material. The fixed arc contact 135 is electrically connected to the fixed current-carrying contact 130. The fixed arc contact 135 is provided separately from the fixed current-carrying contact 130 and is supported by the shield 121 via the current-carrying coil 160.

The energized coil 160 is provided separately from the fixed energized contact 130, the fixed arc contact 135, and the shield 121. The energized coil 160 is disposed inside the peripheral wall 121a of the shield 121. The energized coil 160 is disposed between the fixed arc contact 135 and the bottom wall 121b of the shield 121. The energized coil 160 extends around the axis C. The energized coil 160 extends in a spiral shape centered on the axis C. The energized coil 160 is formed of a conductive material such as a metal material. The energized coil 160 is coupled to and electrically connected to the fixed arc contact 135 and the shield 121. As a result, the energized coil 160 electrically connects the fixed arc contact 135 and the shield 121.

The energized coil 160 has a first end 161 in the opening direction and a second end 162 opposite the opening direction. The first end 161 is directly connected to the edge of the fixed arc contact 135 opposite the opening direction. The first end 161 is fastened to the fixed arc contact 135 by a fastening member 163. The second end 162 is directly connected to a surface of the bottom wall 121b of the shield 121 facing the opening direction. The second end 162 is fastened to the bottom wall 121b by a fastening member 164. In this embodiment, the energized coil 160 extends less than 360° around the axis C. The energized coil 160 generates a magnetic flux when energized. The outer diameter of the energized coil 160 is smaller than the inner diameter of the peripheral wall 121a of the shield 121. The current-carrying coil 160 is not in contact with any components other than the fixed arc contact 135, the bottom wall 121b of the shield 121, and the fastening members 163 and 164.

The movable unit 140 includes a shield 41, a movable contact portion 143, and an operating rod 70. As in the first embodiment, the operating rod 70 is connected to an operating mechanism (not shown).

The movable contact portion 143 includes a movable current-carrying contact 150 and a movable arc contact 155 .
The movable current-carrying contactor 150 is formed in a cylindrical shape. The movable current-carrying contactor 150 includes a peripheral wall portion 150a extending in the axial direction, and a bottom portion 150b extending radially inward from the peripheral wall portion 150a. The bottom portion 150b is disposed at a distance in the separation direction from an open end portion 150c of the peripheral wall portion 150a on the opposite side to the separation direction. The outer peripheral surface of the movable current-carrying contactor 150 is in sliding contact with the slider 42 of the shield 41. The movable current-carrying contactor 150 is constantly electrically connected to the shield 41.

The movable current-carrying contactor 150 is formed so that the open end 150c can be inserted inside the fixed current-carrying contactor 130. The outer diameter of the peripheral wall portion 150a of the movable current-carrying contactor 150 is approximately equal to the inner diameter of the fixed current-carrying contactor 130. The movable current-carrying contactor 150 is in contact with the fixed current-carrying contactor 130 and is electrically connected to the fixed current-carrying contactor 130.

The movable arc contactor 155 is formed in a cylindrical shape coaxial with the movable current contactor 150. The movable arc contactor 155 is disposed inside the movable current contactor 150. The movable arc contactor 155 is disposed on the opposite side of the opening direction from the bottom 150b of the movable current contactor 150. The movable arc contactor 155 is disposed at a radial interval around the entire circumference of the movable current contactor 150. The movable arc contactor 155 is electrically connected to the movable current contactor 150. In this embodiment, the end of the movable arc contactor 155 in the opening direction is directly connected to the bottom 150b of the movable current contactor 150. The end of the movable arc contactor 155 opposite the opening direction protrudes radially outward.

The movable arc contactor 155 is formed so that its tip on the side opposite to the opening direction can be inserted inside the shield 121 of the fixed unit 120. The outer diameter of the movable arc contactor 155 is approximately the same as the inner diameter of the fixed arc contactor 135. When inserted inside the shield 121, the movable arc contactor 155 is inserted inside the fixed arc contactor 135 and makes contact. The movable arc contactor 155 makes contact with the fixed arc contactor 135 and is electrically connected to the fixed arc contactor 135.

Next, the interruption operation of the gas-insulated switchgear 101 will be described.
In the closed state, the movable current-carrying contactor 150 is inserted into and in contact with the fixed current-carrying contactor 130, and the movable arc contactor 155 is inserted into and in contact with the fixed arc contactor 135. This establishes electrical continuity between the fixed unit 120 and the movable unit 140, forming a current path between the pair of conductors 3, 4 (see FIG. 1 ). Of the current paths in the fixed unit 120, the current path that passes through the fixed current-carrying contactor 130 is formed in the fixed current-carrying contactor 130 and the shield 121. Of the current paths in the movable unit 140, the current path that passes through the movable current-carrying contactor 150 is formed in the movable current-carrying contactor 150 and the shield 41.

When the movable unit 140 is displaced in the opening direction from the closed state, the fixed current-carrying contact 130 opens from the movable contact portion 143 earlier than the fixed arc contact 135. This cuts off the current path through the fixed current-carrying contact 130 in the fixed unit 120, and cuts off the current path through the movable current-carrying contact 150 in the movable unit 140. Meanwhile, the fixed arc contact 135 and the movable arc contact 155 are in contact with each other and are conductive, so a current path for the interrupting current is formed between the pair of conductors 3, 4. In this state, the only current path between the pair of conductors 3, 4 passes through the current-carrying coil 160, the fixed arc contact 135, and the movable arc contact 155.

When the movable unit 140 is further displaced in the opening direction, the fixed arc contact 135 and the movable arc contact 155 are opened, and the state transitions from the closed state to the open state. When the fixed arc contact 135 and the movable arc contact 155 are opened, an arc discharge occurs between the fixed arc contact 135 and the movable arc contact 155. In this state, the only current path between the pair of conductors 3, 4 passes through the current-carrying coil 160, the fixed arc contact 135, and the movable arc contact 155. Therefore, when an arc discharge is occurring, an interrupting current flows through the current-carrying coil 160.

When a current flows through the energized coil 160, the energized coil 160 functions as a coil. In this embodiment, the energized coil 160 functions as an air-core coil. The energized coil 160 generates a magnetic flux such that the magnetic field lines extending from the inside of the energized coil 160 due to the interruption current pass between the fixed arc contact 135 and the movable arc contact 155. The magnetic flux interlinks with the arc generated between the fixed arc contact 135 and the movable arc contact 155. As a result, the arc discharge is extinguished and the current is interrupted, as in the first embodiment. Then, the gas-insulated switchgear 101 completes the interruption operation.

As described above, the gas-insulated switchgear 101 of this embodiment includes an energized coil 160 that generates a magnetic flux that interlinks with the arc that has been generated between the fixed arc contact 135 and the movable arc contact 155. The energized coil 160 is provided separately from the shield 121, the fixed energized contact 130, and the fixed arc contact 135, and is coupled to and electrically connected to the shield 121 and the fixed arc contact 135. According to this configuration, the energized coil 160 conducts the shield 121 and the fixed arc contact 135, so that an interrupting current flows through the energized coil 160 in a state in which an arc discharge has been generated. This allows the energized coil 160 to generate a magnetic flux, so that the magnetic flux interlinks with the arc, thereby extinguishing the arc discharge. Here, since the energized coil 160 is coupled to the shield 121 and the fixed arc contact 135, the structure of the fixed arc contact 135 can be prevented from becoming complicated, compared to a configuration in which a means for generating a magnetic flux is provided within the fixed arc contact. That is, compared to a configuration in which both ends of the fixed arc contact are connected to each other via a current-carrying coil and an insulating member is provided in the middle of the fixed arc contact to insulate both ends, the mechanical joints around the fixed arc contact can be reduced and the structure of the fixed arc contact can be simplified. Also, compared to a configuration in which the fixed arc contact itself is formed into a coil shape, the structure of the fixed arc contact can be simplified. Therefore, the complexity of the structure of the magnetic field extinction type gas-insulated switchgear 101 can be suppressed.

Seventh Embodiment
FIG. 19 is a vertical sectional view showing a main part of a gas-insulated switchgear according to the seventh embodiment.
The seventh embodiment shown in Fig. 19 differs from the sixth embodiment in that a fixed portion 145A, to which a shield 121 and a fixed arc contact 135A are fixed to each other, is provided on a fixed contact portion 123A. Note that the configuration other than that described below is the same as that of the sixth embodiment.

The fixed arc contactor 135A has a tip portion 136 located at the end of the fixed arc contactor 135A in the opening direction and in contact with the movable arc contactor 155, and a fitting portion 137 located radially outward of the tip portion 136. The fixed arc contactor 135A is a single member in which the tip portion 136 and the fitting portion 137 are continuously integrated. The tip portion 136 is formed in the same manner as the fixed arc contactor 135 in the sixth embodiment. A first end portion 161 of the current-carrying coil 160 is connected to the edge of the tip portion 136 on the opposite side to the opening direction.

The fitting portion 137 is continuously connected to the tip portion 136. The fitting portion 137 is connected to the end of the outer peripheral surface of the tip portion 136 on the opposite side to the opening direction. The fitting portion 137 extends from the connection portion with the tip portion 136 in the opposite side to the opening direction. As a result, the fitting portion 137 forms a gap between the tip portion 136 and the fixed current-carrying contact 130. The fitting portion 137 extends radially outward of the current-carrying coil 160. The fitting portion 137 is not in contact with the current-carrying coil 160. The fitting portion 137 is formed in a cylindrical shape coaxial with the tip portion 136. The outer peripheral surface of the fitting portion 137 extends in the axial direction with a constant radius of curvature. The outer diameter of the fitting portion 137 is approximately the same as the inner diameter of the peripheral wall 121a of the shield 121. The outer peripheral surface of the fitting portion 137 is in close contact with the inner peripheral surface of the peripheral wall 121a of the shield 121. The shield 121 directly supports the outer peripheral surface of the fixed arc contact 135A at the fixed portion 145A. In addition, the edge of the fitting portion 137 on the opposite side to the separation direction abuts against the bottom wall 121b of the shield 121.

The fixed portion 145A includes a fastening member 146 that fastens the peripheral wall 121a of the shield 121 to the fitting portion 137 of the fixed arc contact 135A. That is, the shield 121 and the fixed arc contact 135A are fixed to each other at the fixed portion 145A by the fastening force of the fastening member 146. As a result, the fixed portion 145A fastens the shield 121 and the fixed arc contact 135A by a structure different from that of the current-carrying coil 160. The fastening member 146 is arranged so that its head fits into a recess formed in the outer peripheral surface of the shield 121. The fastening members 146 are arranged at equal angular intervals around the axis C.

According to the present embodiment described above, in addition to the same advantageous effects as those of the sixth embodiment, the following advantageous effects are achieved.
The gas-insulated switchgear 101 of the present embodiment includes a fixed portion 145A, in which the fixed arc contact 135A and the shield 121 are fixed to each other, and which is different from the energized coil 160. With this configuration, the fixing strength of the fixed arc contact 135A to the shield 121 can be improved, and therefore durability against impact when the fixed arc contact 135A is electrically connected to the movable arc contact 155 can be further improved.

The shield 121 also directly supports the outer peripheral surface of the fixed arc contact 135A at the fixed portion 145A. This improves the radial fixing strength of the fixed arc contact 135A to the shield 121.

In this embodiment, a resistive film or intermediate member may be provided on the fixed portion, as in the modified example of the second embodiment.

Eighth embodiment
FIG. 20 is a vertical sectional view showing a main part of a gas-insulated switchgear according to the eighth embodiment.
In the seventh embodiment shown in Fig. 19, the shield 121 and the fixed arc contact 135A are fixed to each other at a fixing portion 145A by the fastening force of a fastening member 146. In contrast, the eighth embodiment shown in Fig. 20 differs from the seventh embodiment in that the shield 121B and the fixed arc contact 135B are fixed to each other by being screwed together at a fixing portion 145B. Note that the configuration other than that described below is the same as that of the seventh embodiment.

As shown in FIG. 20, a female thread 122 is formed on the inner peripheral surface of the peripheral wall 121Ba of the shield 121B. A male thread 138 is formed on the outer peripheral surface of the fitting portion 137B of the fixed arc contactor 135B. The male thread 138 of the fixed arc contactor 135B screws into the female thread 122 of the shield 121B. As a result, the shield 121B and the fixed arc contactor 135B are fixed to each other at the fixing portion 145B.

According to the present embodiment described above, in addition to the same advantageous effects as those of the seventh embodiment, the following advantageous effects are achieved.
In this embodiment, an internal thread 122 is formed on the inner peripheral surface of the shield 121B, and an external thread 138 is formed on the outer peripheral surface of the fixed arc contact 135B, which is screwed into the internal thread 122. This configuration can improve the axial fixing strength of the fixed arc contact 135B to the shield 121B.

In this embodiment, a resistive film or intermediate member may be provided on the fixed portion, as in the modified example of the third embodiment or the fourth embodiment.

Ninth embodiment
FIG. 21 is a vertical sectional view showing a main part of a gas-insulated switchgear according to the ninth embodiment.
The ninth embodiment shown in Fig. 21 differs from the sixth embodiment in that a fixed portion 145C, to which a shield 121 and a fixed arc contact 135C are fixed to each other, is provided on a fixed contact portion 123C. Note that the configuration other than that described below is the same as that of the sixth embodiment.

As shown in FIG. 21, the fixed arc contactor 135C has a tip 136C in the opening direction that is located at the end of the fixed arc contactor 135C in the opening direction and contacts the movable arc contactor 155, and a leg 137C that extends from the tip 136C in the opposite direction to the opening direction. The fixed arc contactor 135C is a single member in which the tip 136C and the leg 137C are continuously integrated. The tip 136C is formed in the same manner as the fixed arc contactor 135 in the sixth embodiment. A first end 161 of the energized coil 160 is connected to the edge of the tip 136C opposite the opening direction.

The leg 137C extends inside the energized coil 160. The leg 137C is not in contact with the energized coil 160. The leg 137C includes a flange 137Ca fixed to the bottom wall 121b of the shield 121, and a connecting portion 137Cb connecting the flange 137Ca and the tip portion 136C. The connecting portion 137Cb is disposed inside the energized coil 160. The connecting portion 137Cb extends in the axial direction. The connecting portion 137Cb is formed in a cylindrical shape coaxial with the tip portion 136C. The end of the connecting portion 137Cb in the opening direction is connected to the inner periphery of the end face of the tip portion 136C opposite to the opening direction. The flange 137Ca extends radially inward from the end of the connecting portion 137Cb in the opening direction. The flange 137Ca is formed in a disk shape that closes the opening of the connecting portion 137Cb. The flange 137Ca abuts against the bottom wall 121b of the shield 121 from the opening direction.

The fixed portion 145C includes a fastening member 146C that fastens the bottom wall 121b of the shield 121 and the flange 137Ca of the fixed arc contact 135C. That is, the shield 121 and the fixed arc contact 135C are fixed to each other by the fastening force of the fastening member 146C at the fixed portion 145C. The fastening member 146C is arranged along the axis C. The fastening member 146C is arranged so that its head fits inside the leg portion 137C of the fixed arc contact 135C.

According to the present embodiment described above, in addition to the same advantageous effects as those of the sixth embodiment, the following advantageous effects are achieved.
The gas-insulated switchgear 101 of the present embodiment includes a fixed portion 145C, in which the shield 121 and the fixed arc contact 135C are fixed to each other, which is different from the energized coil 160. With this configuration, the fixing strength of the fixed arc contact 135C to the shield 121 can be improved, and therefore durability against impact when the fixed arc contact 135C is electrically connected to the movable arc contact 155 can be further improved.

The fixed arc contactor 135C has a tip 136C that is disposed inside the peripheral wall 121a of the shield 121 and contacts the movable arc contactor 155, and a leg 137C that extends from the tip 136C in the direction opposite to the opening direction, abuts against the bottom wall 121b of the shield 121, and is fixed to the bottom wall 121b. With this configuration, the fixed arc contactor 135C is supported by the bottom wall 121b of the shield 121 from the side opposite to the opening direction. This improves the fixing strength of the fixed arc contactor 135C to the shield 121 in the direction opposite to the opening direction.

In addition, the leg 137C extends inside the energized coil 160. This allows the leg 137C to function as the iron core of the energized coil 160. This allows the magnetic flux generated by the energized coil 160 to be increased.

In this embodiment, a resistive film or intermediate member may be provided on the fixed portion, as in the modified example of the fifth embodiment.

In each of the above embodiments and their modified examples, the energized coil 60, 60A, 160 is a solenoid that extends in a three-dimensional spiral shape, but is not limited to this configuration. The energized coil may be a coil that extends in a two-dimensional spiral shape. In addition, the energized coil does not have to extend in an arc shape, and may extend around the axis C while bending.

In each of the above embodiments and their modified examples, the energized coils 60, 60A, and 160 are fastened to other members, but this configuration is not limited thereto. For example, the energized coils may be welded to other members.

According to at least one embodiment described above, by having a current-carrying coil that is provided separately from the arc contactor and the current-carrying path member including the current-carrying contactor and the shield, that is coupled and electrically connected to the arc contactor and the current-carrying path member, and that generates a magnetic flux that interlinks with the arc, it is possible to prevent the structure of the arc contactor from becoming complicated, compared to a configuration in which a means for generating magnetic flux is provided within the arc contactor. Therefore, it is possible to prevent the structure of the magnetic field extinction type gas-insulated switchgear from becoming complicated.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are within the scope of the invention and its equivalents as set forth in the claims, as well as the scope and gist of the invention.

1, 101...gas-insulated switchgear, 10...sealed container, 45A, 45B, 45C, 45D, 45E, 45F, 45G, 45H, 45I, 145A, 145B, 145C...fixing portion, 46, 46G, 146, 146C...fastening member, 47, 47E, 47H...resistance film, 48, 48F, 48I...intermediate member, 48a...male thread (first male thread), 48b...female thread (second female thread), 50, 50A, 50D ... Movable current-carrying contact (current-carrying path member), 50a... peripheral wall portion, 50b... bottom portion, 52... female thread (first female thread), 56... male thread (second male thread), 57, 136C... tip portion, 58, 137C... legs, 60, 60A, 160... current-carrying coil (magnetic flux generating member), 121, 121B... shield (current-carrying path member), 122... female thread, 130... fixed current-carrying contact (current-carrying path member), 138... male thread, C... axis

Claims (10)

A contact portion disposed in a sealed container filled with an insulating gas;
an arc contact that is disposed within the sealed container, contacts the contact portion in a closed state, and separates from the contact portion during an opening operation to generate an arc discharge between the contact portion and the arc contact;
a current path member that is disposed within the sealed container, is provided separately from the arc contact, and includes a current-carrying contact that comes into contact with the contact portion in the closed state and separates from the contact portion earlier than the arc contact during the opening operation, and that forms a current path that passes through the current-carrying contact in the closed state;
a magnetic flux generating member that is provided separately from the arc contact and the current path member, that is coupled to and electrically connected to the arc contact and the current path member, and that generates a magnetic flux that interlinks with the arc when current is applied;
Equipped with
the current path member and the magnetic flux generating member are directly connected to each other,
The inner diameter of the magnetic flux generating member is smaller than the outer diameter of the arc contact.
Gas insulated switchgear. The arc contact and the current path member are fixed to each other by a fixing portion.
2. The gas-insulated switchgear according to claim 1. When the direction in which the arc contact and the current path member are displaced relative to the contact portion during the opening operation is defined as the opening direction,
The current path member is
a cylindrical peripheral wall portion extending in the separation direction from a contact portion with the contact portion;
a bottom portion extending radially inward from the peripheral wall portion;
having
The arc contact is
a tip portion disposed inside the peripheral wall portion and in contact with the contact portion;
a leg portion extending from the tip portion in the separation direction to come into contact with the bottom portion and be fixed to the bottom portion;
having
3. The gas-insulated switchgear according to claim 2. The tip portion is formed in an annular shape,
the magnetic flux generating member is connected to the tip portion and extends around a central axis of the tip portion in the separation direction relative to the tip portion;
The leg portion extends inside the magnetic flux generating member.
4. The gas-insulated switchgear according to claim 3. the current path member is formed so as to surround the arc contact and supports an outer surface of the arc contact at the fixing portion;
3. The gas-insulated switchgear according to claim 2. An internal thread is formed on an inner surface of the current path member,
An outer surface of the arc contact is formed with a male thread that screws into the female thread.
6. The gas-insulated switchgear according to claim 5. the fixed portion includes an intermediate member interposed between the current path member and the arc contact and having a higher electrical resistivity than the magnetic flux generating member,
A first internal thread is formed on an inner surface of the current path member,
a first male thread is formed on an outer surface of the intermediate member to be screwed into the first female thread;
A second internal thread is formed on an inner surface of the intermediate member,
A second male thread is formed on an outer surface of the arc contact to be screwed into the second female thread.
7. The gas-insulated switchgear according to claim 6. The fixed portion includes an intermediate member interposed between the current path member and the arc contact and having a higher electrical resistivity than the magnetic flux generating member.
The gas-insulated switchgear according to claim 4 or 5. the fixed portion is interposed between the current path member and the arc contact and includes a resistive film having a higher electrical resistivity than the magnetic flux generating member;
The gas-insulated switchgear according to any one of claims 3 to 6. the fixing portion has a higher electrical resistivity than the magnetic flux generating member and includes a fastening member that fastens the current path member and the arc contact.
The gas-insulated switchgear according to claim 8 or 9.

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