TWI797809B - 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 concerns gas-insulated switching devices.

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

The snap-action mechanism has: a shaft electrically connected to the fixed-side terminal; an electrode for interrupting an arc generated when the tip of the shaft receives an interrupting current; and a fitting for engaging the shaft with the movable electrode device; and an opening spring that drives the blocking electrode together with the shaft rod in the direction opposite to the movable electrode rod.

It has the following structure: When closing the circuit between the fixed side terminal and the movable side terminal by the movable electrode rod, the movable electrode rod is engaged with the shaft rod, and when the circuit is opened, the shaft rod is pulled by the movable electrode rod In this way, the opening spring accumulates energy, and the engaging device is separated at a predetermined position, and the opening spring releases energy to drive the shaft rod, so that the blocking electrode is separated in the direction opposite to the movable electrode rod to block current.

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent No. 519278

In Patent Document 1, the fixed-side terminal and the movable-side terminal are open-circuited to form an open-circuit pole. Therefore, compared with the ground (against ground) and phase-to-phase (between phases), it must 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 after the current is interrupted when the current is interrupted, it is necessary to ensure that the recovery voltage that rises from the movable electrode rod and the electrode for interruption is required. withstand voltage performance.

As one of the measures to ensure the withstand voltage performance, there is a proposal of accommodating the blocking electrode inside the fixed-side terminal to relax the electric field between the terminals. However, as described above, since the disconnecting electrodes are far apart, it is necessary to drive the blocking electrodes quickly in order to accommodate them in the fixed-side terminals in a short time. In particular, when performing interruption with relatively high return voltage, such as cable charging current interruption, it is necessary to drive the electrode for interruption more quickly.

This project was developed to solve such problems, and the purpose is to provide a gas insulated switchgear that can drive the blocking electrode at a lower speed than conventional technology even when the switching is performed with recovery voltage. composition.

The gas insulated switchgear disclosed in this case is provided with: the fixed side terminal is arranged in an airtight container formed by sealing insulating gas; the movable side terminal is arranged opposite to the fixed side terminal, and has a The movable electrode rod to ensure electrical conduction; and the driving mechanism are to interrupt the electrical conduction between the movable side terminal and the fixed side terminal; wherein, the fixed side terminal has a movable type of blocking that engages with the movable electrode rod when the circuit is closed Use electrodes and movable shields for electric field relaxation, and when the movable electrode rod and the electrode for blocking are engaged and separated, the shielding system for electric field relaxation and the movement of the electrodes for blocking will act in conjunction with the movement of the electrodes for blocking. It is housed inside the shield for electric field relaxation.

According to the gas insulated switchgear disclosed in this case, by accommodating the blocking electrode in the electric field relaxation shield, the electric field of the blocking electrode can be relaxed at a position where the distance between the movable side terminal and the fixed side terminal is relatively short, and the electric field caused by the rising The back arc caused by the recovery voltage of the device can reduce the speed of driving the blocking electrode.

1: Fixed side terminal

2: Movable side terminal

2a: Through hole

3: Movable electrode rod

3a: The engaging part on the female side

4: Contact piece for movable electrode rod

5a, 5b: base conductor

6: Piston

7: Cylinder

8: Electrode for blocking

8a: Shaft stop

8b: shaft rod

8c: Contact pressure spring

8d: Male side engaging part

8e: Auxiliary electrode

8f, 8g: contact end face

8h: Inclined contact surface

9: Contact piece for piston

10: pole opening spring

11: Cylindrical conductor

12: Shielding unit for electric field relaxation

12a: Shield stop for electric field relaxation

12b: Pillar

12c: shielding spring

12d: Shielding for electric field relaxation

12e, 12f: contact end face

12g: Hole

12h: Inclined contact surface

13: Protrusion

14: stop part

Fig. 1 is a sectional view of an essential part of a gas insulated switchgear of Embodiment 1 in an open state of a circuit breaker.

Fig. 2 is a sectional view of essential parts of a breaking electrode mounted in a circuit breaker of a gas insulated switchgear according to Embodiment 1.

Fig. 3 is a cross-sectional view of essential parts of a shielding unit for electric field relaxation mounted in a circuit breaker of a gas insulated switchgear according to Embodiment 1.

Fig. 4 is a sectional view of essential parts in a closed state of a circuit breaker of the gas insulated switchgear of Embodiment 1.

Fig. 5 is a cross-sectional view of the essential parts immediately after the engaging part is engaged during the transition from the circuit breaker closed state to the open state of the gas insulated switchgear of Embodiment 1.

Fig. 6 is a cross-sectional view of essential parts just before the engaging part of the circuit breaker of the gas insulated switchgear of Embodiment 1 is opened and separated.

Fig. 7 is a sectional view of main parts immediately after the engaging part of the circuit breaker of the gas insulated switchgear of Embodiment 1 is opened and separated.

8 is a cross-sectional view of a main part immediately after the breaking electrode mounted in the circuit breaker of the gas insulated switchgear according to Embodiment 1 is accommodated inside the shield for electric field relaxation.

9 is a cross-sectional view of essential parts of the shaft end and the shield end for electric field relaxation mounted on the circuit breaker of the gas insulated switchgear of Embodiment 2.

Hereinafter, preferred implementation forms of the gas insulated switchgear of the present invention will be described with reference to the drawings. In addition, the same symbols are assigned to the same contents and corresponding parts, and detailed description thereof will be omitted. In the subsequent embodiments, similarly, overlapping descriptions of components with the same symbols will be omitted.

Implementation type 1.

Fig. 1 is a sectional view of an essential part of a gas insulated switchgear of Embodiment 1 in an open state of a circuit breaker. The basic functions required to open and close the circuit are composed of fixed side terminal 1, movable side terminal 2, and Movable electrode rod 3 constitutes. These structures are arranged in a gas-enclosed airtight container. Each configuration will be described in detail below.

One end surface of the cylindrical conductor 11 is mechanically and electrically connected to one end of the fixed-side terminal 1 coaxially. In addition, the other end surface is connected to the base conductor (base conductor) 5b mechanically and electrically. As far as the mechanical connection method is concerned, bolting can be carried out, 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 with a curved surface is fixed so as to cover the base conductor 5b.

The piston 6 is coaxially connected mechanically and electrically to the opening formed in the fixed-side terminal 1 perpendicular to the base conductor 5b. According to this, the piston 6 is of course fixed against movement. As far as the mechanical connection method is concerned, bolting can be carried out, and the contact surface can also be plated with silver to obtain electrical connection.

The cylindrical cylinder 7 is provided for inserting the piston 6 , and the electrical conduction between them is ensured by the contact piece 9 for the piston. This cylinder body 7 is contact-sliding along piston 6, and its detailed action is stated later.

A protruding portion 13 is formed or disposed on the outer peripheral portion of the opening end portion of the cylinder 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 as the cylinder 7 moves.

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 . This predetermined position is determined by the elastic force of the opening spring 10 and the like. In addition, a helical pole-opening spring 10 is arranged along the outer circumference of the cylinder body 7, one end of which is fixed to the spring receiving part provided on the extension part 13, and the other end is fixed to the cylinder on the fixed side terminal 1 side. Internal spring receiving part.

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

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

The auxiliary electrode 8e has a ring shape in which a hole through which the shaft rod 8b passes 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 described later moves from right to left on the paper of FIG. The contact pressure spring 8c is compressed, and the auxiliary electrode 8e is moved toward the end of the shaft rod 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). The contact pressure spring 8 c is compressed to apply a load that brings the auxiliary electrode 8 e into contact with the movable electrode rod 3 , and the auxiliary electrode 8 e takes charge of electrical conduction from the movable electrode rod 3 to the blocking electrode 8 .

FIG. 3 is a sectional view of essential parts of the shielding unit 12 for electric field relaxation. The shield unit 12 for electric field relaxation is configured to include: a shield end 12a for electric field relaxation as a pedestal, a support 12b extending from the shield end 12a for electric field relaxation, a shield spring 12c arranged around the support 12b, and a shield spring 12c attached to the support. Shield 12d for electric field relaxation at the front end of 12b.

A hole 12g through which the cylinder 7 can pass is formed at the center of the shield stopper 12a for electric field relaxation. Furthermore, in the open circuit shown in FIG. 1, the end portion of the electric field relaxation shielding end 12a is in contact with the cylindrical conductor 11, and the spring force of the opening spring 10 is set to be larger than the spring force of the shielding spring 12c. The engagement is performed in a state where the contact end surface 8g formed on the shaft end 8a presses the contact end surface 12f. The support 12b penetrates through the fixed-side terminal 1, and a shield 12d for electric field relaxation is attached to the front end. One end of the shield spring 12 c is coupled to the 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 relax the concentration of the electric field, the shield 12d for electric field relaxation is formed by a gently curved surface, and after the open circuit shown in FIG. 1 and the disconnection shown in FIG. It is arranged on the side of the movable-side terminal 2 from the front end of the auxiliary electrode 8e, and the blocking electrode 8 is accommodated inside the shield 12d for electric field relaxation.

Next, the movable-side terminal 2 in FIG. 1 will be described. The movable electrode rod 3 mounted on the movable-side terminal 2 is formed hollow, and the female-side engaging portion 3 a is disposed in the hollow portion. The female-side engaging portion 3 a is provided with a movable electrode rod contact 4 on an 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 sheet of FIG. 1 . As stated later by referring to FIG. 4, with this configuration, when the circuit is closed, the movable electrode rod 3 moves to the inner side of the fixed side terminal 1, so that the female side engaging part 3 a engages with the male-side engaging portion 8 d on the side of the fixed-side terminal 1 , and electrically connects the movable-side terminal 2 to the fixed-side terminal 1 to form a circuit.

The operation of the circuit breaker of the gas insulated switchgear configured as described above will be described.

In the open circuit state shown in FIG. 1, the spring force of the open pole spring 10 is set to be stronger than that of the shield spring 12c in the compressed state. Thereby, a force in the direction of the left side of the drawing is generated at the end 8a of the shaft rod mechanically connected to the cylinder 7 receiving the elastic force of the opening spring 10, so that the electrode 8 for blocking and the shielding unit 12 for relieving the electric field are held together near the end face of the cylindrical conductor 11 . In addition, the shield spring 12c is in a compressed state. In addition, the piston 6 is inserted into the deepest position of the cylinder 7, the auxiliary electrode 8e is located at the front end of the shaft rod 8b, and the male-side engaging portion 8d is arranged inside the auxiliary electrode 8e.

Fig. 4 shows that the driving device not shown drives the movable electrode rod 3 to move from the through hole 2a of the movable side terminal 2 toward the fixed side terminal 1 on the left side of the paper, so that the movable electrode rod 3 and the auxiliary electrode 8e Closed circuit state of abutment. In this state, the auxiliary electrode 8e is pushed by the movable electrode rod 3 to the left side of the paper and moves on the shaft rod 8b, and the contact pressure spring 8c with one end fixed to the auxiliary electrode 8e also moves along with the auxiliary electrode 8e. The left side of the paper is pushed in and compressed. At this time, the male-side engaging portion 8 d protrudes from the auxiliary electrode 8 e and enters into 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 will not penetrate into the movable electrode rod 3 under pressure. In this closed circuit state, the main circuit current flows to the movable terminal 2 , the movable electrode rod 3 , and the fixed terminal 1 .

Next, the opening operation will be described. FIG. 5 shows that the movable electrode rod 3 is moved toward the movable side terminal 2 in the right direction of the paper when returning from the closed circuit state in FIG. 4 to the open circuit state. in keeping public When the side engaging portion 8d is engaged with the female-side engaging portion 3a, the blocking electrode 8 also moves toward the movable terminal 2 until the moving of the movable electrode rod 3 toward the movable terminal 2 is completed. In addition, the movable electrode rod 3 is in contact with the blocking electrode 8 to maintain a state of being electrically connected. 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 side of the movable side terminal 2, and a series of parts fixed by the male-side engaging portion 8d is then That is to say, the shaft rod 8b, the auxiliary electrode 8e, the contact pressure spring 8c, and the cylinder 7 also move to the right side in the figure together with the movable electrode rod 3 and the female-side engaging portion 3a. Then, with the movement of the cylinder 7, the opening spring 10 is compressed to store energy. In addition, with the movement of the blocking electrode 8, the shielding end 12a for electric field relaxation is released from the force received from the shaft rod end 8a. Therefore, the shielding spring 12c releases energy to move the shielding unit 12 for electric field relaxation. Side terminal 2 side movement.

The state shown in FIG. 6 is the state just before the movable electrode rod 3 moves toward the movable side terminal 2 side with the blocking electrode 8 and returns to the predetermined open circuit position, that is, the state just before the engaging part is separated. It shows the final position of the open-circuit action of the male-side engaging portion 8 d and the female-side engaging portion 3 a in the engaged state, and the stopper portion 14 is in contact with the protruding portion 13 . At this moment, the pole-opening spring 10 is in the most compressed state. Even if the movable electrode rod 3 intends to move further to the right in the figure, the cylinder 7 will be blocked by the stopper 14 and cannot move to the right. The stopper portion 14 and the protruding portion 13 function as a releaser, 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 current path of the main circuit in the state of FIG. 6 is the movable side terminal 2, the movable electrode rod 3, the auxiliary electrode 8e, the male side engaging part 8d, the shaft rod 8b, the cylinder body 7, the piston 6, the base conductors 5b, 5a, Cylindrical conductor 11 , fixed-side terminal 1 .

Fig. 7 shows the 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 opening spring 10 releases energy and begins to stretch. The male-side engaging part 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, during the period until the contact pressure spring 8c is fully extended, the auxiliary electrode 8e to which the contact pressure is applied toward the movable electrode rod 3 by the contact pressure spring 8c is in contact with the movable electrode rod 3 to maintain an electrically connected state. In addition, the shield unit 12 for electric field relaxation is maintained in a state where the shield end 12a for electric field relaxation is separated from the shaft end 8a, and therefore does not change from the position shown in FIG. state. When the contact pressure spring 8c is fully stretched, 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, and the return voltage rise sequence ( Timing) is delayed to increase the initial velocity of the breaking electrode.

8 further shows that the opening spring 10 releases energy, so that the blocking electrode 8 separated from the movable electrode rod 3, including the auxiliary electrode 8e, moves toward the inner side of the shield 12d for electric field relaxation, and the shield end 12a for electric field relaxation is connected to the shielding end 12a. When the butt end 8a of the shaft comes into contact. Although the recovery voltage rises due to the separation of the auxiliary electrode 8e from the movable electrode rod 3, the blocking electrode 8 is accommodated inside the shield 12d for electric field relaxation. With this arrangement, the surface of the shield 12d for relieving the electric field on the side of the fixed terminal 1 that faces the surface of the movable terminal 2 is in a state of facing each other with gentle metal surfaces. The rise of the electric field is suppressed, reducing the possibility of back arcing. Thereafter, the pole opening spring 10 is released to release energy, and the shielding stop 12a for electric field relaxation is pushed into the end face of the cylindrical conductor 11 by the shaft stop 8a, returning to the open circuit state shown in FIG. 1 .

As described above, according to the present embodiment, by accommodating the blocking electrode 8 inside the shield 12d for relieving the electric field that moves to a predetermined position, even when the distance between the fixed-side terminal 1 and the movable-side terminal 2 is compared, The close position can relax the electric field of the blocking electrode 8 and suppress the back arc caused by the rising return voltage, so that the driving speed of the blocking electrode 8 can be reduced. By reducing the driving speed of the blocking electrode 8, the spring force of the opening spring 10 can be reduced, and the shock caused by the operation can be reduced along with the reduction of the spring force of the opening 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 structure simplification and cost reduction can be expected more than the conventional structure.

Implementation Type 2

As shown in FIG. 1, in the open state, the shaft end 8a of the blocking electrode 8 in FIG. 2 and the shielding end 12a for electric field relaxation of the shielding unit 12 for electric field relaxation in FIG. It is assembled as a cylindrical base with a bottom part. That is, when referring to FIG. 2 and FIG. 3 , the contact end surface 8f formed at the shaft end 8a and the contact end surface 12e formed at the shield end 12a for electric field relaxation are in contact with each other with respective surfaces parallel to the moving direction. , and the contact end surface 8g formed on the bottom of the shaft end 8a and the contact end surface 12f formed on the bottom of the shield end 12a for electric field relaxation are in contact with each other in a plane perpendicular to the moving direction. In this case, the elastic force of the opening spring 10 and the shielding spring 12c is applied only to the contact end surface 8g and the contact end surface 12f, and therefore, there is a risk of damage due to repeated open-circuit state and closed-circuit state.

On the other hand, the contact surfaces of the shaft end 8a and the shield end for electric field relaxation are in contact with each other on inclined surfaces as if two truncated cone-shaped pedestals are superimposed, and the elastic force is dispersed in two directions. Specifically, as shown in FIG. 9 , by making the inclined contact surface 8h formed on the shaft end 8a and the inclined contact surface formed on the electric field relaxation shield end 12a 12h engagement can make the elastic force disperse towards the moving direction and the parallel and vertical directions. Such an inclined surface, for example, can be formed by cutting off a part of the vertical surface of the shaft rod end 8a in the prior art, and can also reduce the weight of the shaft rod end 8a, and can also help to improve the blocking function. The driving speed of the electrode 8.

As mentioned above, by forming the contact part in an inclined shape, when the opening spring releases energy and then contacts mechanically, the elastic force of the opening spring and the shielding spring can be directed toward the direction of movement of the spring and the direction perpendicular to the movement. Dispersion and reduction of the amount of material can be expected to increase the driving speed of the blocking electrode.

This document describes various exemplary implementation forms and embodiments, but the various features, aspects, and functions described in one or more implementation forms are not limited to the application of specific implementation forms, but can be used alone or in various combinations. to apply to the implementation type.

Accordingly, numerous modification examples not illustrated can be conceived within the technical scope disclosed in the present specification. For example, 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 are included.

1: Fixed side terminal

2: Movable side terminal

2a: Through hole

3: Movable electrode rod

3a: The engaging part on the female side

4: Contact piece for movable electrode rod

5a, 5b: base conductor

6: Piston

7: Cylinder

8: Electrode for blocking

9: Contact piece for piston

10: pole opening spring

11: Cylindrical conductor

12: Shielding unit for electric field relaxation

13: Protrusion

14: stop part

Claims (5)

A gas insulated switchgear, comprising: a fixed side terminal arranged in a sealed container filled with an insulating gas; a movable side terminal arranged opposite to the fixed side terminal and having a function for contacting the fixed side terminal The movable electrode rod is separated to ensure electrical conduction; and the driving mechanism is to interrupt the electrical conduction between the movable terminal and the fixed terminal; wherein the fixed terminal has a mechanism for engaging with the movable electrode rod when the circuit is closed The movable blocking electrode and the movable electric field relieving shield, and when the movable electrode rod is engaged with the blocking electrode, the electric field relieving shield and the blocking electrode operate together In conjunction with moving toward the movable side terminal, the blocking electrode is accommodated inside the shield for electric field relaxation. The gas insulated switchgear according to claim 1, wherein after the blocking electrode is housed inside the electric field relaxing shield, the blocking electrode and the electric field relaxing shield move toward the fixed terminal. The gas insulated switchgear according to claim 1 or 2, 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 engagement part which is in contact with the movable The female-side engaging portion in the electrode rod is engaged; and the contact pressure spring, when the engagement between the movable electrode rod and the aforementioned blocking electrode is cut off, even the aforementioned female-side engaging portion and the aforementioned male-side engaging portion Separated, it will still be spring pushed to keep the contact between the aforementioned auxiliary electrode and the end of the aforementioned movable electrode rod for a certain period of time. The gas insulated switchgear according to claim 1 or 2, wherein, The walls of the shaft end of the blocking electrode as a pedestal and the shield end of the electric field easing shield as a pedestal have inclined surfaces, and the shaft end and the shield for electric field easing When the stoppers are engaged, the aforementioned inclined surfaces are in contact with each other. A gas insulated switchgear, comprising: a fixed side terminal arranged in a sealed container filled with an insulating gas; a movable side terminal arranged opposite to the fixed side terminal and having a function for contacting the fixed side terminal The movable electrode rod is separated to ensure electrical conduction; and the driving mechanism is to interrupt the electrical conduction between the movable terminal and the fixed terminal; wherein the fixed terminal has a mechanism for engaging with the movable electrode rod when the circuit is closed The movable blocking electrode and the movable electric field relieving shield, and when the movable electrode rod is engaged with the blocking electrode, the electric field relieving shield and the blocking electrode operate together The aforesaid blocking electrodes are housed in the inner side of the shield for easing the electric field; the aforesaid blocking electrodes have: an auxiliary electrode, which is in contact with the end of the aforementioned movable electrode rod when the circuit is closed; Engage with the female-side engaging part in the aforementioned movable electrode rod; and contact the pressure spring, when the engagement between the aforementioned movable electrode rod and the aforementioned blocking electrode is cut off, even if the aforementioned female-side engaging part and the aforementioned male-side When the engaging part is separated, it will still be spring-pushed to keep the contact between the auxiliary electrode and the end of the movable electrode rod for a certain period of time; the stop end of the shaft rod used as the pedestal of the aforementioned blocking electrode and the aforementioned shield for electric field relaxation are used as a pedestal Each wall surface of the shield stop for electric field relaxation has an inclined surface, and the inclined surfaces are brought into contact with each other when the shaft end and the shield stop for electric field relaxation are engaged.

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