TW202228350A - Gas insulation switching apparatus - Google Patents

Abstract

According to the present invention, an electric field relaxation shield (12d) is provided at the portion of a fixed side terminal (1) facing to a movable side terminal (2). Further, the electric field relaxation shield unit (12) is arranged as a structure that is capable of moving toward the direction of the movable side terminal (2), and a function of energizing is distributed to the fixed side terminal (1), a function of relaxing the electric field between terminals is distributed to the electric field relaxation shield unit (12). The electric field of a breaking electrode (8) is relaxed at a position relatively closer than the distance between the movable side terminal (2) and the fixed side terminal (1), so that the re-ignition due to the recovery voltage rising at the time of opening circuit can be suppressed. Therefore, it is capable of reducing the speed for driving the blocking electrode (8).

Description

Gas insulated switchgear

This case is about gas-insulated switchgear.

In many cases, a circuit breaker housed in a gas-insulated switchgear does not have a function of interrupting current. For example, in Patent Document 1, in a circuit breaker in which a fixed-side terminal and a movable-side terminal including a movable electrode rod are arranged to face each other, the fixed-side terminal is provided with a snap-action mechanism for interrupting current.

The snap-action mechanism includes: a shaft rod electrically connected to the fixed side terminal; an electrode for interrupting an arc generated when the front end of the shaft rod receives a blocking current; an engagement for engaging the shaft rod with the movable electrode rod and an open-pole spring that drives the interrupting electrode together with the shaft rod in the opposite direction to the movable electrode rod.

It has the following structure: when the movable electrode rod closes the circuit between the fixed side terminal and the movable side terminal, the movable electrode rod is engaged with the shaft rod, and when the circuit is opened, the movable electrode rod pulls the shaft rod. By this, the open-pole spring accumulates energy, the latch is separated at a predetermined position, and the open-pole spring releases energy to drive the shaft rod, whereby the blocking electrode is separated in the opposite direction to the movable electrode rod and blocked current. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 519278

[The problem to be solved by the invention]

In Patent Document 1, the connection between the fixed-side terminal and the movable-side terminal is in an open state to form between the disconnecting poles. Therefore, compared with the ground (against ground) and the phase-to-phase (between phases), it is necessary to have a higher withstand voltage performance. . Therefore, the distance between the fixed-side terminal and the movable-side terminal is long.

In addition, in order to suppress the reverse arc (reignition) caused by the recovery voltage that occurs when the current is interrupted and after the current is interrupted, it is necessary to ensure that the recovery voltage that rises immediately after the movable electrode rod and the interrupting electrode are separated. withstand voltage performance.

As a measure to ensure the withstand voltage performance, there is a proposal to accommodate the blocking electrode inside the fixed-side terminal to reduce the electric field between the terminals. However, as described above, since the disconnecting electrodes are far apart, in order to be accommodated in the fixed-side terminal in a short period of time, it is necessary to rapidly drive the disconnecting electrodes. In particular, it is necessary to drive the electrode for interrupting more quickly when performing the interrupting with a relatively high recovery voltage, such as the interrupting of the charging current of the cable.

This application was developed in order to solve such a problem, and the object is to provide a gas-insulated switchgear that can lower the speed of driving the electrode for interruption even when interruption with a recovery voltage is performed compared to the conventional technique. composition. [means to solve the problem]

The gas-insulated switchgear disclosed in the present application is provided with: a fixed-side terminal, which is provided in an airtight container sealed with insulating gas; a movable-side terminal, which is arranged opposite to the fixed-side terminal and has a function for contacting and separating from the fixed-side terminal. The movable electrode rod to ensure electrical conduction; and the driving mechanism are to block the electrical conduction between the movable side terminal and the fixed side terminal; wherein, the fixed side terminal has a movable type of interruption that engages with the movable electrode rod when the circuit is closed. The electrode and the movable shield for electric field relaxation, and when the engagement between the movable electrode rod and the electrode for interruption is disconnected, the shield for electric field relaxation operates in conjunction with the action of the electrode for interruption, and the electrode for interruption is moved. It is housed inside the shield for electric field mitigation. [Inventive effect]

According to the gas insulated switchgear disclosed in the present application, by accommodating the blocking electrode in the shield for electric field relaxation, the electric field of the blocking electrode can be moderated at a position where the distance between the movable side terminal and the fixed side terminal is relatively short, and the increase of the electric field can be suppressed. The reverse arc caused by the recovery voltage can reduce the speed of driving the interrupting electrode.

Hereinafter, with reference to the drawings, the preferred embodiments of the gas-insulated switchgear of the present application will be described. In addition, the same code|symbol is attached|subjected to the same content and an equivalent part, and the detailed description is abbreviate|omitted. In the following embodiments, the same description is omitted for the configuration with the same reference numerals.

Implementation type 1. FIG. 1 is a cross-sectional view of a main part of the gas-insulated switchgear of Embodiment 1 in an open state of a circuit breaker. The basic functions required for opening and closing the circuit are constituted by the fixed-side terminal 1 , the movable-side terminal 2 , and the movable electrode rod 3 . These structures are arranged in an airtight container in which gas is enclosed. Each configuration will be described in detail below.

One end surface of the cylindrical conductor 11 is mechanically and electrically connected coaxially with one end of the fixed-side terminal 1 . In addition, the other end surface is mechanically and electrically connected to the base conductor 5b. As far as the mechanical connection method is concerned, it can be bolted, and the contact surface can also be plated with silver to obtain electrical connection. In addition, the base conductor 5a whose outer periphery is formed of a curved surface is fixed so as to cover the base conductor 5b.

The piston 6 is mechanically and electrically connected coaxially to an opening formed in the fixed-side terminal 1 perpendicular to the base conductor 5b. Accordingly, the piston 6 is of course fixed and does not move. As far as the mechanical connection method is concerned, it can be bolted, and the contact surface can also be plated with silver to obtain electrical connection.

The cylindrical cylinder 7 is provided to insert the piston 6, and electrical conduction between them is ensured by the contact 9 for the piston. The cylinder 7 is in contact and slides along the piston 6, the detailed action of which will be described later.

A protruding portion 13 is formed or disposed on the outer peripheral portion of the opening end portion of the cylinder block 7 . The outer diameter of the protruding portion 13 is substantially the same as the inner diameter of the cylindrical conductor 11 , and can move left and right on the inner peripheral surface of the cylindrical conductor 11 along with the movement of the cylinder 7 .

The inner diameter of the stopper portion 14 is smaller than the outer diameter of the protruding portion 13 , and the stopper portion 14 is formed at a predetermined position inside the cylinder of the cylindrical conductor 11 . The predetermined position is determined by the elastic force of the open-pole spring 10 and the like. In addition, a coil-shaped open-pole spring 10 is arranged along the outer circumference of the cylinder 7, one end of which is fixed to the spring receiving portion provided in the extension portion 13, and the other end is fixed to the cylinder on the side of the fixed-side terminal 1. Internal spring mount.

A rod-shaped blocking electrode 8 that is mechanically and electrically connected to the cylinder 7 coaxially is connected to the front end portion of the cylinder 7 on the side of the fixed-side terminal 1 . FIG. 2 is a cross-sectional view of an essential part of the blocking electrode 8 . The blocking electrode 8 is configured to include a shaft rod end 8a serving as a base, a shaft rod 8b extending from the shaft rod end 8a, a contact pressure spring 8c disposed around the shaft rod 8b, and a shaft rod 8b attached to the shaft rod 8b. The male side engaging portion 8d and the auxiliary electrode 8e which can contact and slide on the shaft rod 8b. The contact pressure spring 8c has a helical shape, and is arranged around the shaft rod 8b coaxially with the male side engaging portion 8d. Auxiliary electrode 8e. A contact end face 8f, which will be described later, is formed on the shaft rod end stop 8a, and the contact end face 8f is in contact with a contact end face 12e provided in the shield stop end 12a for electric field relaxation described later in accordance with the state of the open spring 10.

One end of the male-side engaging portion 8d is inserted into the shaft rod 8b and attached. The other end of the male-side engaging portion 8d is engaged with the female-side engaging portion 3a of the movable electrode rod 3 to be described later when the circuit is closed. Further, in the open state of the contact pressure spring 8c, the front end portion of the male-side engaging portion 8d is positioned further inward than the auxiliary electrode 8e.

The auxiliary electrode 8e has an annular shape in which a hole portion through which the shaft rod 8b can pass through is formed in the center, and can contact and slide on the shaft rod 8b in the axial direction. With this structure, when the movable electrode rod 3, which will be described later, moves from the right to the left in the drawing of FIG. 1 to come into contact with the auxiliary electrode 8e, and further pushes the auxiliary electrode 8e, one end is attached to the side of the auxiliary electrode 8e. The contact pressure spring 8c compresses and moves the auxiliary electrode 8e toward the shaft rod end stop 8a, whereby the male-side engaging portion 8d protrudes from the opening of the auxiliary electrode 8e and engages with the female-side engaging portion 3a ( Refer to Figure 4) described later. When the contact pressure spring 8c is compressed, a load is applied to abut the auxiliary electrode 8e against the movable electrode rod 3 , and the auxiliary electrode 8e serves as electrical conduction from the movable electrode rod 3 to the blocking electrode 8 .

FIG. 3 is a cross-sectional view of an essential part of the shield unit 12 for electric field relaxation. The shield unit 12 for electric field relaxation includes a shield stop 12a for electric field relaxation as a pedestal, a support 12b extending from the shield stop 12a for electric field relaxation, a shield spring 12c disposed around the support 12b, and a support attached to the support Shield 12d for electric field relaxation at the tip of 12b.

A hole 12g through which the cylinder 7 can penetrate is formed in the center of the shield stop 12a for electric field relaxation. Furthermore, when the circuit is open as shown in FIG. 1, the end of the shield stop 12a for electric field relaxation is in contact with the cylindrical conductor 11, and the spring force of the open pole spring 10 is set to be larger than the spring force of the shield spring 12c. The engagement is performed in a state where the contact end surface 8g formed on the shaft rod end stop 8a is pressed against the contact end surface 12f. The support column 12b penetrates the fixed-side terminal 1, and the shield 12d for electric field relaxation is attached to the front-end|tip part. One end of the shield spring 12 c is coupled to the support post 12 b , and the other end is coupled to a recess formed on the outer periphery of the fixed-side terminal 1 . In order to alleviate the concentration of the electric field, the shield 12d for electric field relaxation is formed of a curved surface with a gentle surface, and the front end of the shield 12d for electric field relaxation is formed by the open circuit shown in FIG. 1 and after the cut-off shown in FIG. 8 . It is arrange|positioned at the side of the movable side terminal 2 rather than the front-end|tip part of the auxiliary electrode 8e, and the electrode 8 for blocking is accommodated inside the shield 12d for electric field relaxation.

Next, the movable-side terminal 2 of FIG. 1 will be described. The movable electrode rod 3 mounted on the movable-side terminal 2 is formed in a hollow shape, and a female-side engaging portion 3 a is arranged in the hollow portion. The female-side engaging portion 3 a is provided with a movable electrode rod contact 4 on the outer peripheral surface, and is electrically connected to the movable-side terminal 2 . The movable electrode rod 3 is configured to be able to contact and slide inside the through-hole 2 a penetrating the movable-side terminal 2 in the left-right direction of the drawing of FIG. 1 . As will be described later with reference to FIG. 4 , with such a configuration, when the circuit is closed, the movable electrode rod 3 moves to the inside of the fixed-side terminal 1 so that the female-side engaging portion 3 a and the male side of the fixed-side terminal 1 side The engaging portion 8d is engaged, and the movable-side terminal 2 and the fixed-side terminal 1 are electrically connected to form a circuit.

The operation of the circuit breaker of the gas-insulated switchgear constructed as described above will be described. In the open state shown in FIG. 1, the open-pole spring 10 is set to have a stronger elastic force than the elastic force of the shield spring 12c in a compressed state. As a result, a force in the left direction of the drawing is generated at the shaft end 8a of the cylinder 7 that is mechanically connected to the cylinder 7 that receives the elastic force of the open-pole spring 10, so that the blocking electrode 8 and the shielding unit 12 for alleviating the electric field interact with each other. Together, they are held in the vicinity of the end face of the cylindrical conductor 11 . In addition, the shielding spring 12c is in a compressed state. In addition, the piston 6 is inserted to the deepest position of the cylinder 7, the auxiliary electrode 8e is located at the front end portion of the shaft rod 8b, and the male-side engaging portion 8d is arranged inside the auxiliary electrode 8e.

FIG. 4 shows that the movable electrode rod 3 is driven by a driving device (not shown) to move from the through hole 2a of the movable side terminal 2 to the direction of the fixed side terminal 1 in the left direction of the drawing, so that the movable electrode rod 3 and the auxiliary electrode are moved. 8e is a closed circuit state in contact. In this state, the auxiliary electrode 8e is pushed by the movable electrode rod 3 and is pushed toward the left side of the drawing and moves on the shaft rod 8b, and the contact pressure spring 8c whose one end is fixed to the auxiliary electrode 8e is also moved together with the auxiliary electrode 8e. The left side of the page is pushed in and compressed. At this time, the male-side engaging portion 8d protrudes from the auxiliary electrode 8e and enters the inside of the hollow portion of the movable electrode rod 3 . Since the outer diameter of the male-side engaging portion 8d is smaller than the inner diameter of the female-side engaging portion, it penetrates into the movable electrode rod 3 without being subjected to pressure. In this closed circuit state, the main circuit current flows to the movable side terminal 2 , the movable electrode rod 3 , and the fixed side terminal 1 .

Next, the open circuit operation will be described. In FIG. 5 , when returning to the open state from the closed state shown in FIG. 4 , the movable electrode rod 3 is moved toward the movable side terminal 2 in the right direction of the drawing. In a state where the engagement between the male-side engaging portion 8d and the female-side engaging portion 3a is maintained, the blocking electrode 8 also moves toward the movable-side terminal 2 until the movement of the movable electrode rod 3 toward the movable-side terminal 2 is completed. until. In addition, the movable electrode rod 3 is in contact with the blocking electrode 8 to maintain an electrically connected state. In this state, the movable electrode rod 3 and the blocking electrode 8 are moved from the state of FIG. 5 to the state of FIG. 6 toward the movable side terminal 2 side, and a series of parts fixed by the male side engaging portion 8d is followed. That is, the shaft rod 8b, the auxiliary electrode 8e, the contact pressure spring 8c, and the cylinder 7 also move to the right side of the drawing together with the movable electrode rod 3 and the female side engaging portion 3a. Then, along with the movement of the cylinder 7, the open-pole spring 10 is compressed to store energy. In addition, with the movement of the blocking electrode 8, the shield stop 12a for electric field relaxation is released from the force received from the shaft rod end 8a, so that the shield spring 12c releases energy to move the shield unit 12 for electric field relaxation toward the movable direction. The side terminal 2 side moves.

The state shown in FIG. 6 is the state just before the movable electrode rod 3 returns to the predetermined open position with the movement of the blocking electrode 8 toward the movable side terminal 2, that is, just before the engaging portion is separated. It shows the final position of the open-circuit action of the male-side engaging portion 8d and the female-side engaging portion 3a in the engaged state, and the blocking portion 14 is in contact with the protruding portion 13 . At this time, the open-pole spring 10 is in the most compressed state. Even if the movable electrode rod 3 tries to move further to the right in the drawing, the cylinder 7 is blocked by the stopper 14 and cannot move to the right. The stopper portion 14 and the extension portion 13 function as releasers, and the male-side engaging portion 8d and the female-side engaging portion 3a cannot maintain the engagement completely, and start to release the engagement.

The main circuit current path in the state shown in FIG. 6 is the movable side terminal 2, the movable electrode rod 3, the auxiliary electrode 8e, the male side engaging portion 8d, the shaft rod 8b, the cylinder 7, the piston 6, the base conductors 5b, 5a, Cylindrical conductor 11 and fixed side terminal 1 .

FIG. 7 shows a state immediately after the engaging portion is separated. The engagement between the male-side engaging portion 8d and the female-side engaging portion 3a is disengaged, so that the open-pole spring 10 releases energy and begins to expand. The male-side engaging portion 8d, the shaft rod 8b, the contact pressure spring 8c, and the cylinder 7 start to move to the left side of the drawing with energy. However, until the contact pressure spring 8c is fully extended, the auxiliary electrode 8e applied with the contact pressure to the movable electrode rod 3 side by the contact pressure spring 8c is in contact with the movable electrode rod 3, and the state of electrical connection is maintained. In addition, since the shield unit 12 for electric field relaxation is maintained in a state where the shield stop 12a for electric field relaxation is separated from the shaft rod stop 8a, it does not change from the position shown in FIG. 6, but becomes the closest to the movable side terminal 2 state. When the contact pressure spring 8c is fully extended, the movable electrode rod 3 starts to separate from the auxiliary electrode 8e. In this way, by using the contact pressure spring 8c, the electrical connection between the auxiliary electrode 8e and the movable electrode rod 3 is maintained for a certain period of time even after the engaging portion is opened and separated, so that the recovery voltage rise sequence ( timing) is delayed, and the initial separation speed of the blocking electrode is increased.

8 further shows that the opening spring 10 releases energy, so that the blocking electrode 8 including the auxiliary electrode 8e separated from the movable electrode rod 3 moves toward the inner side of the electric field relaxation shield 12d, and the electric field relaxation shield stop 12a and When the end stop 8a of the shaft rod is in contact. Although the recovery voltage rises because the auxiliary electrode 8e and the movable electrode rod 3 are separated from each other, the blocking electrode 8 is accommodated inside the electric field relaxation shield 12d. With such an arrangement, the surface of the shield 12d for electric field relaxation on the side of the fixed terminal 1 that faces the surface on the side of the movable terminal 2 becomes a state in which all the flat metal surfaces face each other. The rise of the electric field is suppressed, reducing the possibility of reverse arcing. After that, the open-pole spring 10 releases energy, and the shield stop 12a for field relaxation is pushed into the end face of the cylindrical conductor 11 by the shaft stopper 8a, and returns to the open state shown in FIG. 1 .

As described above, according to the present embodiment, by accommodating the blocking electrode 8 inside the electric field alleviation shield 12d that operates to a predetermined position, even the distance between the fixed-side terminal 1 and the movable-side terminal 2 can be compared. Even in a near position, the electric field of the blocking electrode 8 can be relaxed, and the reverse arc caused by the rising recovery voltage can be suppressed, so that the speed at which the blocking electrode 8 is driven can be reduced. By reducing the driving speed of the blocking electrode 8, the elastic force of the open-pole spring 10 can be reduced, and the shock caused by the operation can be reduced along with the reduction in the elastic force of the open-pole spring. When the shock during operation is reduced, the mechanical strength of each part of the circuit breaker can be designed to be relatively low, and the simplification of the structure and the reduction of the cost can be expected compared with the structure of the prior art.

Implementation Type 2 As shown in FIG. 1, in the open state, the shaft rod stop 8a of the blocking electrode 8 of FIG. 2 and the shield stop 12a of the electric field relaxation shielding unit 12 of FIG. A part is assembled so that a cylindrical pedestal has a bottom. 2 and 3, the contact end surface 8f formed on the shaft rod end stop 8a and the contact end surface 12e formed on the shield stop end 12a for electric field relaxation are in contact with each other by their respective surfaces parallel to the moving direction. And, the contact end surface 8g formed at the bottom of the shaft rod stop 8a and the contact end surface 12f formed at the bottom of the shield stop 12a for electric field relaxation are in contact with each other in a plane perpendicular to the moving direction. In this case, since the elastic forces of the open-pole spring 10 and the shielding spring 12c are only applied to the contact end face 8g and the contact end face 12f, there is a risk of damage due to repeated open and closed states.

On the other hand, the contact surfaces of the shaft rod end end 8a and the shield end end for alleviation of electric field are brought into contact with each other by inclined surfaces so that the two truncated cone-shaped pedestals are superimposed so as to disperse the elastic force in two directions. Specifically, as shown in FIG. 9 , by engaging the inclined contact surface 8h formed on the shaft rod stop 8a with the inclined contact surface 12h formed on the shield stop 12a for electric field relaxation, the elastic force can be caused to interact with the moving direction in the moving direction. Dispersion in parallel and vertical directions. Such an inclined surface can be formed by, for example, cutting a part of the vertical surface of the shaft rod end 8a of the prior art, thereby making the shaft rod end 8a light in weight, and also contributing to the lifting of the blocking device. The driving speed of the electrode 8 .

As described above, by forming the contact portion in an inclined shape, when the open-pole spring releases energy and makes mechanical contact, the elastic forces of the open-pole spring and the shield spring can be directed to the direction of movement of the spring and the direction perpendicular to the movement of the spring. It can be expected to increase the driving speed of the blocking electrode by dispersing and reducing the amount of material.

Various exemplary embodiments and examples are described in this case, but the various features, aspects, and functions described in one or more embodiments are not limited to the application of a specific embodiment, but can be used alone or in various combinations. to apply to the implementation type. Accordingly, innumerable modifications not illustrated can be conceived within the technical scope disclosed in the present specification. For example, it includes the case of deforming at least one constituent element, the case of adding or omitting at least one constituent element, and the case of extracting at least one constituent element and combining it with constituent elements of other embodiments.

1: Fixed side terminal 2: Movable side terminal 2a: Through hole 3: Movable electrode rod 3a: Female side engaging part 4: Contacts for movable electrode rods 5a, 5b: base conductor 6: Piston 7: Cylinder block 8: Electrode for interruption 8a: End of shaft rod 8b: Axle bar 8c: Contact pressure spring 8d: male side engaging part 8e: auxiliary electrode 8f, 8g: Contact end face 8h: inclined contact surface 9: Contact for piston 10: Open pole spring 11: Cylinder conductor 12: Shielding unit for electric field relaxation 12a: Shield stop for electric field relaxation 12b: Pillar 12c: Shield spring 12d: Shielding for electric field mitigation 12e, 12f: Contact end face 12g: hole 12h: Inclined contact surface 13: Extension 14: Stopper

FIG. 1 is a cross-sectional view of a main part of the gas-insulated switchgear of Embodiment 1 in an open state of a circuit breaker. 2 is a cross-sectional view of a main part of an electrode for interruption mounted on a circuit breaker of the gas-insulated switchgear according to Embodiment 1. FIG. 3 is a cross-sectional view of a main part of a shielding unit for electric field relaxation mounted on a circuit breaker of the gas-insulated switchgear according to Embodiment 1. FIG. 4 is a cross-sectional view of a main part of a circuit breaker in a closed state of the gas-insulated switchgear of Embodiment 1. FIG. 5 is a cross-sectional view of an essential part immediately after engagement of the engagement portion in the middle of transition from the circuit breaker closed state to the open state of the gas-insulated switchgear according to the first embodiment. 6 is a cross-sectional view of the main part of the circuit breaker of the gas-insulated switchgear according to Embodiment 1, just before the engaging part is opened and separated. 7 is a cross-sectional view of the main part immediately after the engagement part of the circuit breaker of the gas-insulated switchgear according to Embodiment 1 is opened and separated. 8 is a cross-sectional view of an essential part immediately after the blocking electrode mounted on the circuit breaker of the gas-insulated switchgear according to Embodiment 1 is accommodated inside the electric field relaxation shield. 9 is a cross-sectional view of the essential parts of a shaft rod stop and an electric field relaxation shield stop mounted on a circuit breaker of the gas-insulated switchgear according to Embodiment 2. FIG.

1: Fixed side terminal

2: Movable side terminal

2a: Through hole

3: Movable electrode rod

3a: Female side engaging part

4: Contacts for movable electrode rods

5a, 5b: base conductor

6: Piston

7: Cylinder block

8: Electrode for interruption

9: Contact for piston

10: Open pole spring

11: Cylinder conductor

12: Shielding unit for electric field relaxation

13: Extension

14: Stopper

Claims (6)

A gas-insulated switchgear is provided with: The fixed side terminal is arranged in a closed container sealed with insulating gas; The movable-side terminal is disposed opposite to the fixed-side terminal, and has a movable electrode rod that can be used to contact and separate from the fixed-side terminal to ensure electrical continuity; and The driving mechanism is used to block the electrical conduction between the movable side terminal and the fixed side terminal; wherein, The fixed side terminal is provided with a movable blocking electrode and a movable shield for electric field relaxation which are engaged with the movable electrode rod when the circuit is closed. At this time, the shield for electric field relaxation operates in conjunction with the movement of the electrode for interruption, and the electrode for interruption is accommodated inside the shield for electric field relaxation. The gas-insulated switchgear as claimed in claim 1, wherein, When the engagement between the movable electrode rod and the blocking electrode is disconnected, the shield for electric field relaxation moves toward the movable side terminal. The gas-insulated switchgear as claimed in claim 2, wherein, After the electrode for interruption is accommodated inside the shield for electric field relaxation, the electrode for interruption and the shield for electric field relaxation move toward the fixed-side terminal. The gas-insulated switchgear according to any one of claims 1 to 3, wherein, The blocking electrode has: an auxiliary electrode, which is in contact with the end of the movable electrode rod when the circuit is closed; a male-side engaging portion is engaged with a female-side engaging portion in the movable electrode rod; and a contact pressure spring When the engagement between the movable electrode rod and the blocking electrode is disconnected, even if the female-side engaging portion and the male-side engaging portion are separated, the auxiliary electrode and the movable electrode will still be pushed by a spring. The contact of the rod ends is maintained for a certain period of time. The gas-insulated switchgear according to any one of claims 1 to 3, wherein, The respective wall surfaces of the shaft rod end as a pedestal of the interrupting electrode and the electric field relaxation shield end of the electric field relaxation shield as a pedestal have inclined surfaces, and the shaft rod end and the electric field relaxation shield have inclined surfaces. When the end stops are engaged, the inclined surfaces are brought into contact with each other. The gas-insulated switchgear according to claim 4, wherein, The respective wall surfaces of the shaft rod end as a pedestal of the interrupting electrode and the electric field relaxation shield end of the electric field relaxation shield as a pedestal have inclined surfaces, and the shaft rod end and the electric field relaxation shield have inclined surfaces. When the end stops are engaged, the inclined surfaces are brought into contact with each other.

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