CN1256503A - Vacuum switch device - Google Patents

Abstract

A vacuum switchgear, comprising a vacuum tube (20) at both ends of an insulating container (21) hermetically sealed with an insulating medium by first and second metal components (22, 23), the vacuum tube (20) having: The fixed electrode (24) on the above-mentioned first metal member (22), and the movable electrode ( 26); and an operating mechanism (60, 90) that linearly moves the movable electrode (26) in three positions: a closed position, an open position, and a disconnected position.

Description

Vacuum Switchgear

The present invention relates to a vacuum switchgear using SF ₆ gas as an insulating medium, and more particularly to a vacuum switchgear in harmony with the environment in which the usage of SF ₆ or other insulating medium is suppressed.

Taking 22/33kV and 66/77kV class ultra-high transformation equipment as an example, the existing switchgear will be described.

For switchgears of this level, miniaturization and airtightness of the switchgear are required due to problems such as construction costs, high land prices, pollution of the charging part, safety, and noise, so people have been working on gas-insulated switchgears ( GIS: Gas Insulated Switchgear) or box-type gas insulated switchgear (C-GIS: Cubicle-type GIS) development.

In GIS, each electrical equipment is covered with a tubular metal container, and high-pressure SF ₆ gas is sealed as an insulating medium to make it miniaturized and sealed.

Compared with GIS, C-GIS has higher reliability, safety, and easier maintenance and inspection. At the same time, it can also be constructed on a narrow land in a short period of time, and it is in harmony with the surrounding environment. Requirements can also be developed to meet the switchgear.

This C-GIS is a device that stores all electrical equipment in a box-type container using low-pressure insulating gas near atmospheric pressure, and divides the interior into each constituent unit. The appearance is the same as other closed switchboards. of.

As described above, recently, switchgears using SF ₆ gas as an insulating medium are frequently operated.

Fig. 1 is a longitudinal sectional view showing a configuration example of such a typical box-type gas insulated switchgear.

In FIG. 1 , SF ₆ gas 2 is sealed inside a box 1 whose outer periphery is airtightly enclosed with a mild steel plate. The gas compartment of the box body 1 is divided into a power receiving room 1a, a circuit breaker room 1b and a bus bar room 1c.

In the power receiving room 1a, the cable head 3 is attached to the side surface of the box 1. As shown in FIG. The lightning arrester 4 housed in the power receiving room 1 a and the detection insulator 5 are connected by a connecting conductor 7 . In addition, the electric power that passes through the converter 8 is connected to the cable 9 .

In addition, in the breaker chamber 1b, a lower insulating gasket 10a that separates the gas from the power receiving chamber 1a is interposed to house a breaker 11 that houses a vacuum tube (not shown). This circuit breaker 11 is connected to an upper insulating liner 10b that is gas-divided from the bus chamber 1c via a connection conductor 7 therebetween.

The circuit breaker 11 uses a high vacuum as an insulating and arc-extinguishing medium. On the other hand, the isolator 6 uses SF ₆ gas as an insulating and arc-extinguishing medium.

In addition to the electromagnet and the movable iron core, the so-called stable solenoid mechanism equipped with a permanent magnet has the function of maintaining the position of the moving end of the movable iron core by the attractive force of the permanent magnet. In addition, in this stable type solenoid mechanism, there is a mechanism called a monostable type that can hold a position at one end portion of the moving range of the movable core, and a mechanism that can hold positions at both ends of the moving range of the movable core. A mechanism that maintains a position at one end is called a bistable mechanism.

Since the movable iron core attracted by the magnet can be held stably up to the limit of the attractive force, it has been proposed to use a solenoid as the operating mechanism of the vacuum circuit breaker.

The solenoid mechanism that can be used in the operating mechanism of the vacuum circuit breaker is ideally a stable mechanism that can maintain the position of the electrode even when the electromagnet is in a de-energized state. This solenoid mechanism has a small number of components, a simple structure, and operates only linearly. Since there are few parts where a large stress is generated or a large contact surface pressure is applied to slide, there is an advantage that reliability can be easily ensured.

However, in the switchgear having such a configuration, the isolator 6 uses SF ₆ gas as an insulating and arc-extinguishing medium. It is known that the SF ₆ gas has about 100 times the arc extinguishing performance and about 3 times the insulating performance compared with air. Moreover, the SF ₆ gas is a colorless, odorless, tasteless, non-combustible, very stable gas in a normal state, and is non-toxic.

However, when _arc discharge occurs in the SF ₆ gas, decomposition products or decomposition gases of SOF ₂ , SO ₂ , SO ₂ F ₂ , SOF ₄ , HF, SiF _{4 ,} etc. are generated in the SF 6 gas. Since the decomposition product or decomposition gas of the SF ₆ gas is highly toxic, special treatment or management is required when recovering the decomposed gas.

Since the breaker 11 is used to break the emergency current, there is no risk of decomposition products or gas. However, the isolator 6 is used for bus switching or line switching in the substation.

Therefore, the isolator 6 is required to have the breaking duty of the loop current. This loop current will be a current value close to the rated current. At this time, a decomposition product or a decomposition gas occurs in the separator 6 . Therefore, when recovering the gas in such a separator, a method such as absorption by an adsorbent is adopted, but the operation requires great effort.

In addition, SF ₆ gas is a greenhouse gas that causes global warming, and its greenhouse effect coefficient is 24,000 times that of carbon dioxide. Therefore, SF ₆ gas is also a gas to be reduced, and it is required to take measures for emission suppression and reduction. In this way, from the viewpoint of environmental requirements, it is ideal not to use SF ₆ gas as the insulating and arc-extinguishing medium of the isolator.

Therefore, people consider a vacuum isolator that turns the insulating medium of the isolator into a vacuum. However, there is a problem that the price of the switchgear increases.

In addition, in the switchgear shown in FIG. 1, the temperature rise of the connection conductor 7 by the heat generated from the contact point of 11 and the isolator 6 will become a problem. In this way, since the heat generation of the contacts of the circuit breaker 11 or the isolator 6 is caused by Joule heat generated by the contact resistance of this part, it can be seen that some kind of countermeasure for reducing the contact resistance must be taken.

On the other hand, in order to solve such a problem, for example, Japanese Patent Application Laid-Open No. 9-153320 discloses a vacuum switchgear as follows. In this vacuum switchgear, a fixed electrode and a ground electrode are provided at both ends of a cross-shaped vacuum tube, and a energizing shaft and a movable electrode are provided with a vertical position as a fulcrum.

However, in this vacuum switchgear, since the structure of the vacuum tube is complicated, the number of components increases, and the price of the vacuum tube becomes very high. In addition, since the structure is complicated, the assembly of the vacuum tube is not easy, so it is difficult to obtain a highly reliable vacuum tube. In addition, since the movable shaft moves in the circumferential direction via the bellows, an excessive load in the bending direction is applied to the bellows, which lacks long-term reliability in terms of strength. For this reason, a vacuum leak of the vacuum tube will be caused. Furthermore, when performing a short-time current test, in order to suppress the rebound of the movable electrode caused by the electromagnetic force, although the load is usually loaded with a spring, it is difficult to add such a load in the vacuum tube of such a structure. question.

For the above reasons, it becomes difficult to realize a switchgear that does not use SF ₆ gas.

In addition, from the viewpoint of the operating mechanism, if a solenoid mechanism is used, the position of the movable iron core can be maintained only at the end of the operating range, and cannot be kept stable at the middle position. Therefore, the closed position (the position where the contact of the movable electrode contacts the contact of the fixed electrode), the three positions of the open position, the disconnection position, and the four positions including the ground position cannot be stably maintained.

In addition, since the attractive force obtained by the magnet is greatly affected by the gap between the magnet and the magnetic body, if the gap is widened, the attractive force will decrease sharply. For this reason, it is difficult to achieve sufficient travel required to maintain the 3-position or 4-position. In addition, in order to increase the stroke, the magnetic force of the electromagnet or the permanent magnet must be large, and there is a problem that the size of the device is increased or the electromagnet needs to be driven with a large current.

Overview of the invention

The object of the present invention is to provide a vacuum tube with simple structure and high reliability, and a highly reliable operating mechanism that can realize three positions of closed position, open position, and disconnected position, or four positions including the ground position. , A vacuum switchgear in harmony with the environment that suppresses the usage of insulating media such as SF ₆ gas.

The vacuum switchgear of the present invention has

A vacuum tube at both ends of an insulating container in which an insulating medium is hermetically sealed with the first and second metal members. The vacuum tube has: a fixed electrode penetrating through the first metal member and fixed on the first metal member; At the same time as the second metal member, it is fixed to the above-mentioned second metal member through a bellows and is arranged as a movable electrode facing the above-mentioned fixed electrode;

And an operating mechanism that linearly moves the movable electrode to three positions of the closed position, the open position, and the disconnected position.

In the hermetically sealed vacuum tube body, a fixed electrode and a movable electrode are arranged opposite to each other on a pair of energized shafts that pass through the metal member and can move in the axial direction through the bellows. The contact point of the movable electrode is connected to the fixed electrode. The position of the contact contact of the vacuum tube is defined as the closed position, and the three positions of the closed position, the open position and the disconnected position are continuously moved in a straight line, and the movable electrode in the vacuum tube body is moved to the disconnected position. The contacts operate, so the contacts of the isolator can be accommodated in the vacuum tube body for the circuit breaker.

In addition, another vacuum switchgear of the present invention has

The first and second metal components are used to hermetically seal the vacuum tubes at both ends of the insulating container filled with an insulating medium, and the above-mentioned vacuum tube has a fixed electrode that penetrates through the above-mentioned first metal component and is fixed on the above-mentioned first metal component; At the same time as the metal member, the movable electrode is fixed to the second metal member through a bellows and is arranged to face the fixed electrode; and the ground electrode is arranged on the opposite side of the movable electrode to the fixed electrode;

And an operating mechanism that linearly moves the above-mentioned movable electrode in the four positions of the closed position, the open position, the disconnection position and the ground position.

In the above-mentioned vacuum tube body, a ground electrode is arranged at a position opposite to the energization shaft connected to the movable electrode. The inner diameter of the ground electrode opposite to the energization axis is smaller than the inner diameter of the movable electrode. Insulation cylinders are respectively arranged between the end plates, and the position where the movable electrode contacts the fixed electrode is defined as the closed position, and the four positions of the closed position, the open position, the disconnection position and the grounding position can be continuously moved in a straight line. The contact for the isolator and the contact for the grounding device are accommodated in the vacuum tube body for the circuit breaker.

On the other hand, in the case where d ₁ is the gap length between the contacts at the open position and d 2 _is the gap length between the contacts at the open position, the relationship between the gap lengths d ₁ and d ₂ is defined as The method of d ₂ =(1.3～2.6)·d ₁ can reduce the insulation breakdown rate between the contacts at the disconnection position, and can realize coordination of the insulation at the disconnection position and the open position.

In addition, an arc shield made of metal is provided so as to surround the fixed electrode and the movable electrode, and the length of each gap between the arc shield and the fixed electrode and the movable electrode is set to d ₃ , and the gap between the contacts at the disconnection position is set to When the length is set to _d2 , the relationship between the gap lengths _d2 and _d3 can be determined as _d3 = (0.35～0.8)· _d2 , and the arc shielding can be determined when viewed from the insulating surface The optimal position can reduce the electric field strength of the movable electrode and the fixed electrode.

In addition, the second shield surrounding the fixed electrode and the third shield surrounding the movable electrode are provided, and the second shield and the third shield are supported by metal plates at both ends, so that the size of the movable side and the fixed side can be reduced. Electric field strength at the joint or movable and fixed electrodes.

On the other hand, by supporting the second shield with the current-carrying shaft connected to the fixed electrode, it is possible to reduce the electric field strength of the movable side and the fixed side contact or the movable electrode and the fixed electrode while reducing the The electric field strength at the upper end of the arc shield.

In addition, by using the fixed electrode to support the second shield, the electric field strength at the upper end of the arc shield can be reduced while reducing the electric field strength between the movable side and the fixed side contact or the movable electrode and the fixed electrode.

Furthermore, in the case where d ₄ is the gap length between the second shield and the third shield and d 2 is the gap length between the contacts at the disconnected position, the relationship between the respective gap lengths d ₂ and _{d 4 is} determined. The method of d ₄ =(0.6～0.95)·d ₂ can reduce the electric field strength of the movable side and the fixed side contact or the movable electrode and the fixed electrode, and can also make the electric field strength of these various parts optimization.

On the other hand, the material of the above-mentioned second shield and third shield is made of stainless steel.

In addition, the material of the above-mentioned second shield and third shield is set to tungsten.

Using stainless steel or tungsten as the material of the second shield and the third shield can reduce the electric field intensity of the movable side and the fixed side contact or the movable electrode and the fixed electrode, and can also improve the second shield. Insulation performance between the shield and the 3rd shield.

On the other hand, composite electrolytic polishing is performed on the surfaces of the second mask and the third mask.

In addition, a reforming layer formed by irradiation of electron beams is provided on the surfaces of the second mask and the third mask.

The surface of the second shield and the third shield is subjected to composite electrolytic grinding treatment or electron beam treatment, which can reduce the electric field intensity of the movable side and the fixed side contact or the movable electrode and the fixed electrode at the same time. The insulation performance between the second shield and the third shield can be improved.

Furthermore, when d ₅ is the gap length between the energized shaft fixed to the movable electrode and the ground electrode facing it, and d ₁ is the gap length between the contacts in the open position, the The relationship between the gap lengths d ₁ and d ₅ is set as d ₅ =(1.3～1.8)·d ₁ , so that the insulation between the contacts at the open position on the movable side and the insulation at the ground position can be coordinated. Reliability can be improved.

On the other hand, in the vacuum switchgear of the present invention, the operating mechanism has a breaking mechanism part and an isolating mechanism part arranged in series and each linearly operates between two positions; the frame of the breaking mechanism part is connected to the isolating mechanism On the movable part of the part, the above-mentioned isolating mechanism part performs the switching operation from the above-mentioned gap length _d1 to the above-mentioned gap length _d2 .

The disconnecting mechanism part that requires high-speed operation for switching from the closed position to the open position and the isolation mechanism part that does not require high-speed operation for switching from the open position to the disconnecting position are arranged in series. 3-position switch action can be realized with a reliable and inexpensive operating mechanism.

In addition, in the vacuum switchgear of the present invention, the operating mechanism includes a breaking mechanism portion arranged in series and linearly operating between two positions, and an isolating mechanism linearly operating between three positions including an intermediate point. Part; the frame of the above-mentioned isolation mechanism part is connected to the above-mentioned movable electrode, and the switching action of the above-mentioned gap length _d1 is performed; the frame of the above-mentioned breaking mechanism part is connected to the movable part of the above-mentioned isolation mechanism part, and the above-mentioned isolation mechanism part performs from Two-stage switching operation from the gap length _d1 to the gap length _d2 , and from the gap length _d2 to the gap length _d3 .

Use the breaking mechanism part to perform the switching action from the closed position to the open position that requires high-speed action, and use the isolation mechanism part that is arranged in series to the breaking mechanism part to perform the switching action from the open position to the breaking position that does not require high-speed action In addition to the two-stage operation method of the switching operation from the disconnection position to the grounding position, it is possible to realize the four-position switching operation with a reliable and inexpensive operating mechanism.

Furthermore, in the vacuum switchgear of the present invention, the operating mechanism has a breaking mechanism part, an isolating mechanism part, and a grounding mechanism part arranged in series and linearly operating between two positions; the frame of the breaking mechanism part is connected to On the above-mentioned movable electrode, the switching action of the above-mentioned gap length _d1 is performed; the frame of the above-mentioned breaking mechanism part is connected to the movable part of the above-mentioned isolating mechanism part, and the above-mentioned isolating mechanism part performs the switching operation from the above-mentioned gap length _d1 to the above-mentioned gap length Switching action up to _d2 : the frame of the isolation mechanism part is connected to the movable part of the grounding mechanism part, and the grounding mechanism part performs the switching action from the gap length _d2 to the gap length _d3 .

Adopt the breaking mechanism part that requires high-speed action to perform switching action from the closed position to the open position, and the isolation mechanism part that does not need high-speed action to perform switching action from the open position to the breaking position By arranging the grounding mechanism part in series for the switching operation from the disconnection position to the grounding position, it is possible to realize the switching operation at 4 positions with a reliable and inexpensive operating mechanism.

On the other hand, each of the above-mentioned breaking mechanism part and the above-mentioned isolating mechanism part uses a solenoid mechanism provided with an electromagnetic coil, a yoke, a movable iron core, and a permanent magnet, or a solenoid mechanism provided with a spring if necessary. Composition; the movable part of the above-mentioned breaking mechanism part is the movable iron core of the first solenoid mechanism, the frame of the above-mentioned breaking mechanism part is the yoke of the first solenoid mechanism, and the movable part of the above-mentioned isolating mechanism part is the second The movable iron core of the solenoid mechanism, the frame of the isolation mechanism part is the yoke iron of the second solenoid mechanism; each of the above-mentioned movable iron cores relies on the magnetic force of the above-mentioned electromagnetic coil and permanent magnet, or as required While reciprocating under the restoring force of the spring, the position is held at both ends of the moving range of the movable core by the attractive force of the permanent magnet or by the restoring force of the spring as necessary.

The switch operation between the closed position and the open position is performed at a high speed by using the breaking mechanism part with a small weight of the movable part, while maintaining each position stably, and the switch between the open position and the breaking position is reliably performed by the isolation mechanism part Action, while stably maintaining their respective positions, can use a reliable and cheap operating mechanism to realize the switch action.

In addition, the above-mentioned circuit breaking mechanism part is constituted by a solenoid mechanism provided with an electromagnetic coil, a yoke, a movable iron core, and a permanent magnet, or a solenoid mechanism provided with a spring if necessary; The movable iron core of the wire tube mechanism, the frame of the above-mentioned breaking mechanism part is the above-mentioned yoke; the above-mentioned movable iron core performs reciprocating action by means of the magnetic force of the above-mentioned electromagnetic coil and permanent magnet, or by means of the restoring force of the above-mentioned spring, At the same time, the position is maintained at both ends of the moving range of the movable iron core by the attractive force of the permanent magnet or by the restoring force of the spring if necessary; A yoke, an electromagnetic actuator with a movable iron core and a permanent magnet forming a convex portion opposite to the convex portion of the yoke, the movable part of the above-mentioned isolating mechanism part is the movable iron core of the above-mentioned electromagnetic actuator; The frame of the mechanism part is the yoke of the above-mentioned electromagnetic actuator; while the above-mentioned movable iron core reciprocates with the help of the attraction force of the above-mentioned electromagnetic coil and the permanent magnet, at the two ends of the moving range of the above-mentioned movable iron core At the same time, the convex portion of the yoke and the convex portion of the movable core are held in position facing each other by the attractive force of the permanent magnet at the middle position of the operation range.

The switch operation between the closed position and the open position is performed at a high speed by using the breaking mechanism part with a small weight of the movable part, while maintaining each position stably, and the switch between the open position and the breaking position is reliably performed by the isolation mechanism part Action, while maintaining their respective positions stably, using the grounding mechanism part to reliably perform the switching action between the disconnected position and the grounding position, while stably maintaining their respective positions, the switching action can be realized with a reliable and cheap operating mechanism.

In addition, each of the above-mentioned breaking mechanism portion, the above-mentioned isolating mechanism portion, and the grounding mechanism portion uses a solenoid mechanism equipped with an electromagnetic coil, a yoke, a movable iron core, and a permanent magnet, or a solenoid mechanism equipped with a spring as required. The movable part of the above-mentioned breaking mechanism part is the movable iron core of the first solenoid mechanism, the frame of the above-mentioned breaking mechanism part is the yoke of the first solenoid mechanism, and the movable part of the above-mentioned isolating mechanism part is The movable iron core of the second solenoid mechanism, the frame of the isolation mechanism part is the yoke of the second solenoid mechanism, the movable part of the grounding mechanism is the movable iron core of the third solenoid mechanism, and the grounding mechanism Part of the frame is the yoke of the third solenoid mechanism; each of the above-mentioned movable iron cores reciprocates by means of the magnetic force of the above-mentioned electromagnetic coil and permanent magnet, or by the restoring force of the above-mentioned spring as required, and at the same time, Both ends of the moving range of the movable core are held in position by the attractive force of the permanent magnet or, if necessary, by the restoring force of the spring.

The switch operation between the closed position and the open position is performed at a high speed by using the breaking mechanism part with a small weight of the movable part, while maintaining each position stably, and the switch between the open position and the breaking position is reliably performed by the isolation mechanism part Action, while maintaining their respective positions stably, using the grounding mechanism part to reliably perform the switching action between the disconnected position and the grounding position, while stably maintaining their respective positions, the switching action can be realized with a reliable and cheap operating mechanism.

In addition, when any one of the electromagnetic coil of the solenoid mechanism or the electromagnetic coil of the electromagnetic actuator is excited to move the iron core, the other electromagnetic coil is excited to reinforce the other movable iron core that does not move. The holding force of the position can be strengthened even if there is a reaction force acting on other series-arranged mechanism parts by making the movable iron core of any one of the breaking mechanism part, the isolating mechanism part, or the grounding mechanism part act. The force to maintain the position, so it can maintain its position stably, which can prevent malfunction and improve reliability.

As described in detail above, if the vacuum switchgear of the present invention is used, a vacuum tube with a simple structure and high reliability can be provided, and three positions of the closed position, the open position and the disconnection position can be realized, or the grounding position can also be included. A highly reliable operating mechanism with 4 positions including one position, and an environment-friendly vacuum switchgear that suppresses the usage of insulating media such as SF ₆ gas.

A brief description of the drawings

FIG. 1 is a longitudinal sectional view showing a configuration example of a typical conventional box-type gas insulated switchgear.

Fig. 2 is a longitudinal sectional view showing Embodiment 1 of the vacuum tube of the vacuum switchgear of the present invention.

Fig. 3 is a longitudinal sectional view showing Embodiment 2 of the vacuum tube of the vacuum switchgear of the present invention.

FIG. 4 is a characteristic diagram for respectively explaining the effects of the above-mentioned Embodiment 1 and Embodiment 2. FIG.

FIG. 5 is a characteristic diagram for respectively explaining the effects of the above-mentioned Embodiment 1 and Embodiment 2. FIG.

Fig. 6 is a longitudinal sectional view showing Embodiment 5 of the vacuum tube of the vacuum switchgear of the present invention.

Fig. 7 is a longitudinal sectional view showing Embodiment 6 of the vacuum tube of the vacuum switchgear of the present invention.

Fig. 8 is a longitudinal sectional view showing Embodiment 7 of the vacuum tube of the vacuum switchgear of the present invention.

FIG. 9 is a characteristic diagram for respectively explaining the effects of the above-mentioned Embodiment 5, Embodiment 6, and Embodiment 7. FIG.

FIG. 10 is a characteristic diagram for respectively explaining the effects of the above-mentioned Embodiment 5, Embodiment 6, and Embodiment 7. FIG.

FIG. 11 is a characteristic diagram for respectively explaining the effects of the above-mentioned Embodiment 5, Embodiment 6, and Embodiment 7. FIG.

Fig. 12 is a characteristic diagram for respectively explaining the actions of the above-mentioned Embodiment 5, Embodiment 6, and Embodiment 7.

13A to 13C are longitudinal sectional views showing Embodiment 12 of the operating mechanism of the vacuum switchgear of the present invention.

Fig. 14 is a longitudinal sectional view showing a fourteenth embodiment of the operating mechanism of the vacuum switchgear of the present invention.

15A to 15C are longitudinal sectional views showing Embodiment 15 of the operating mechanism of the vacuum switchgear of the present invention.

16A to 16D are longitudinal sectional views showing Embodiment 16 of the operating mechanism of the vacuum switchgear of the present invention.

Fig. 17 is a longitudinal sectional view showing a seventeenth embodiment of the operating mechanism of the vacuum switchgear of the present invention.

Embodiments of the present invention will be described in detail below with reference to the drawings.

(Example 1)

Fig. 2 is a longitudinal sectional view showing a configuration example of the vacuum tube 20 of the vacuum switchgear according to the first embodiment of the present invention.

An insulating cylinder 21 made of ceramics or glass has openings at both ends sealed with a fixed end plate 22 and a movable end plate 23 to form an airtight container.

A fixed current conduction shaft 25 to which a fixed electrode 24 is joined is supported and fixed on the fixed side end plate 21 . A movable electrode 26 is fixed to a movable energization shaft 27 facing the fixed electrode 24 . The movable energizing shaft 27 is connected to an operating mechanism to be described later.

Further, on the side where the fixed electrode 24 and the movable electrode 26 are in contact, contacts 28a and 28b made of various materials according to the application of the vacuum tube 20 are arranged on the respective electrodes.

On the other hand, a bellows 29 is provided between the movable energization shaft 27 and the movable side cover 23 so that the movable electrode 26 can move linearly.

In addition, an arc shield 32 is provided in an electrically insulated state around the fixed electrode 24 and the movable electrode 26 to prevent dirt from adhering to the insulating cylinder 21 brought by metal vapor when the current is interrupted.

The position where the contacts 28a and 28b are in contact is defined as the closed position. The movable electrode 26 is moved, and the position at which the gap length between the respective contacts is _d1 is defined as the open position. The movable electrode 26 is moved, and the position at which the gap length between the respective contacts is _d2 is defined as the disconnection position.

In the vacuum tube 20 of this embodiment, when there is a command from the control circuit of the vacuum switching device not shown, the movable electrode 26 moves to a position where the gap length between the contact points 28a and 28b is _d1 . (open position).

When the control circuit of the vacuum switchgear issues an open pole (open circuit) command for the isolator, the movable electrode 26 is further moved, and the gap length between the respective contacts 28a and 28b becomes the position _d2 (open circuit position) .

In this way, the contact point 28b provided on the movable electrode 26 linearly moves continuously among the three positions of the closed position, the open position, and the disconnection position.

In this case, since the contacts of the isolator are housed in a vacuum container, even if a current close to the rated current such as the circuit current is disconnected, since SF ₆ gas is not used, no decomposition gas or decomposition products will be generated. .

In other words, as mentioned above, as the insulating and arc-extinguishing medium of the isolator, SF ₆ gas which itself is a greenhouse gas is not used, and a high vacuum is used, so it is in line with the latest market demand from the environmental point of view.

In addition, since the contact point of the circuit breaker and the isolator becomes one, the contact resistance is reduced, and the temperature rise of the main circuit can be reduced.

Furthermore, since the contacts of the circuit breaker and the isolator are housed in the same vacuum container and the structure is simple, the vacuum tube 20 can be mass-produced, and the vacuum switchgear can be miniaturized and reduced in price.

As mentioned above, in this embodiment, a circuit breaker and an isolator can be formed by continuously moving linearly at the three positions of the closed position, the open position and the disconnected position, so they can be operated with one operating mechanism. action. Therefore, also from this point of view, it is possible to reduce the size and cost of the vacuum switchgear.

(Example 2)

Fig. 3 is a longitudinal sectional view showing an example of the configuration of the vacuum tube 20 of the vacuum switchgear of the second embodiment, the same parts as in Fig. 2 are given the same reference numerals and their descriptions are omitted, and only the parts different from Fig. 2 will be described here. .

The vacuum tube 20 of this embodiment, as shown in FIG. The inner diameter of 35 is smaller than the outer diameter of movable electrode 26 .

Between the ground electrode 35 and the metal end plates 22, 23 at both ends, insulating cylinders 21, 36 are disposed, respectively. The position where the contact point 28b of the movable electrode 26 is in contact with the contact point 28a of the fixed electrode 24 is the closed position, and the position where the gap length between the contact points 28a and 28b is _d6 is the ground position.

With the above-mentioned structure, in this embodiment, the movable electrode can move linearly continuously among the four positions of the closed position, the open position, the disconnection position and the ground position.

In the vacuum tube 20 of this embodiment, the movable electrode 26 moves when a command to change from the disconnected state to the grounded state is issued from the control circuit of the vacuum switchgear (not shown) during maintenance of the vacuum switchgear. , the ground is grounded at the position (ground position) where the gap length between the contacts 28a, 28b becomes _d6 .

With this, linear movement is continuously performed at the four positions of the closed position, the open position, the disconnection position, and the grounded position.

In this case, since the grounding device is housed in the vacuum tube 20, the vacuum switchgear can be downsized.

In addition, since the structure of the vacuum tube 20 is simple, the assembly of the vacuum tube 20 becomes easy, enabling mass production.

Furthermore, since the number of parts is reduced, it is possible to reduce the price of the vacuum switchgear.

In this embodiment, the four positions of the closed position, the open position, the disconnection position and the grounding position are continuously moved linearly, so that they can be operated by one operating mechanism. Therefore, also from this point of view, it is possible to reduce the size and cost of the vacuum switchgear.

(Example 3)

In the vacuum tube 20 of the present embodiment 3, in the vacuum tube 20 of FIG. 2 described above, the gap length between the contacts 28a and 28b at the closed position is defined as _d1 , and the gap length between the contacts 28a and 28b at the disconnected position When d ₂ is defined, the relationship between the respective gap lengths d ₁ and d ₂ is defined as d ₂ =(1.3 to 2.6)·d ₁ .

In the vacuum tube 20 of this embodiment, by setting the length of each gap as d ₂ =(1.3-2.6)·d ₁ , the probability of insulation breakdown between the contacts at the disconnected position can be reduced, and the disconnected position and Coordination of the insulation in the open position.

Generally speaking, the relationship between the breakdown voltage Vb between electrodes in vacuum and the gap length d can be expressed by Vb=a·b ⁿ . Although this value of n varies depending on the electrode material, it is known that n=0.6 roughly.

In addition, the probability distribution of insulation breakdown in vacuum is a normal distribution, and the standard deviation σ at this time represents the dispersion of the breakdown voltage.

Here, the margin of insulation performance at the open position of the contact _28b provided on the movable electrode ₂₆ shown in FIG. For the aim. In this regard, since the margin of the insulation performance at the disconnected position must be considered in terms of reliability and safety, _V50 is specified so as to have a margin of 3σ. The probability of failure for 3σ is about 0.1%.

The dispersion σ of the breakdown voltage between the contacts 28a and 28b is generally considered to be 10 to 23%, although it varies greatly depending on the contact material, surface state, and breaking current.

The characteristic diagram of Fig. 4, starting from the above-mentioned relationship between the breakdown voltage and the gap length, shows the ratio of the gap length providing 3σ to the gap length providing 2σ (i.e. the ratio of _d2 and _d1 ) and the breakdown voltage An example of the relationship between the dispersion (standard deviation) σ.

If the standard deviation is 10%, the gap length ratio d ₂ /d ₁ is about 1.3, and if the standard deviation is 23%, the gap length ratio d ₂ /d ₁ is about 2.6.

As described above, by setting the gap length to d ₂ <d ₁ =1.3 to 2.6, an economical vacuum switchgear with high insulation reliability can be obtained.

(Example 4)

In the vacuum tube 20 of the fourth embodiment, in the vacuum tube 20 of _FIG . When the length of the gap between the shield 32 and the fixed electrode 24 and the movable electrode 26 is _d3 , and the length of the gap between the contacts 28a and 28b at the disconnected position is _d2 , the relationship between _d2 and _d3 is d ₃ =(0.35˜0.8)·d ₂ .

In the vacuum tube 20 of this embodiment, by setting the relationship between the gap lengths d ₂ and d ₃ to be d ₃ =(0.35-0.8)·d ₂ , the arc shielding when viewed from the insulating surface can be determined. The optimum position can reduce the electric field strength of the fixed electrode.

The characteristic diagram of FIG. 5 shows an example of the relationship between the aforementioned ratio of d ₃ and d ₂ and the electric field intensity E1 at the end of the fixed electrode 24 .

In FIG. 5 , the electric field intensity Ec on the vertical axis is the breakdown electric field intensity when the material of the fixed electrode 24 is copper.

When the gap length ratio d ₃ /d ₂ becomes less than 0.5, since the electric field intensity at the electrode end is determined by the gap length between the fixed electrode 24 and the arc shield 32, the smaller the gap length ratio d ₃ /d ₂ is, the greater the electric field intensity is. The electric field strength is higher at the extreme ends.

When the gap length ratio d ₃ /d ₂ is 0.35, the electric field strength at the end of the fixed electrode 24 reaches the breakdown electric field strength.

When the gap length ratio d ₃ /d ₂ is equal to or greater than 0.8, the electric field intensity at the end of the fixed electrode 24 is determined by the electrode interval, and therefore does not become so low.

Also, when the ratio d ₃ /d ₂ of the gap length becomes larger, since the diameter of the vacuum tube 20 becomes larger, it is desirable that the ratio d ₃ /d ₂ of the gap length be as small as possible from the viewpoint of cost.

Therefore, by setting the ratio d ₃ /d ₂ of the gap length to 0.35 to 0.8, the outer diameter of the vacuum tube 20 can be suppressed, and the vacuum tube 20 with excellent insulating properties can be obtained.

(Example 5)

FIG. 6 is a longitudinal sectional view showing a configuration example of the vacuum tube 20 of the vacuum switchgear of this embodiment. In FIG. 6 , the same reference numerals are assigned to the same parts as those in FIG. 2 and their descriptions are omitted, and only the different parts will be described here.

The vacuum tube 20 of the fifth embodiment has, as shown in FIG. 6 , a second shield 33 surrounding the fixed electrode 24 and a third shield 34 surrounding the movable electrode 26 . The second shield 33 and the third shield 34 are supported and fixed by metal end plates at both ends.

In the vacuum tube 20 of this embodiment, the second shield 33 surrounding the fixed electrode 24 and the third shield 34 surrounding the movable electrode 26 are provided, and the metal end plates at both ends are used to support and fix the second shield 33 and the third shield. 34 can reduce the electric field intensity between the movable side contact 28b and the fixed side contact 28a, or the movable electrode 26 and the fixed electrode 24.

That is, in FIG. 6, the insulation performance between the respective contacts 28a, 28b is determined by the microscopic surface state of the contacts as described above. Therefore, the insulation performance is much lowered depending on the breaking condition of the current. In addition, even if the switch is performed under no load, a part of the contact facing the cold welding is peeled off, becoming a protrusion on the surface or detached in the form of particles, so the insulation performance is lowered.

Therefore, by providing the second shield 33 surrounding the fixed electrode 24 and the third shield 34 surrounding the movable electrode 26, the electric field intensity on the surface of each contact 28a, 28b is reduced, and as a result, the insulating performance is not affected by the disconnection of the current. conditions or no-load switching effects.

As described above, by providing the second shield 33 surrounding the fixed electrode 24 and the third shield 34 surrounding the movable electrode 26, a vacuum switchgear having excellent insulation performance can be obtained.

(Example 6)

Fig. 7 is a longitudinal sectional view showing a configuration example of the vacuum tube 20 of the vacuum switchgear of this embodiment. In FIG. 7 , the same reference numerals are assigned to the same parts as in FIG. 6 and their descriptions are omitted, and only the different parts will be described here.

In the vacuum tube 20 of this embodiment, as shown in FIG. 7 , the second shield 33 surrounding the fixed electrode 24 is supported and fixed by the fixed energization shaft 25 .

In the vacuum tube 20 of this embodiment, the second shield 33 surrounding the fixed electrode 24 is supported and fixed by the fixed energizing shaft 25, so that the movable side contact 28b and the fixed side contact 28a, or the movable electrode can be reduced. 26 and the electric field intensity of the fixed electrode 24, meanwhile, the electric field intensity at the upper end of the arc shield can also be reduced.

That is, in the vacuum tube 20 of FIG. 6 in which the second shield 33 is provided, the electric field intensity at the upper end portion of the arc shield becomes high.

Therefore, by supporting and fixing the second shield 33 surrounding the fixed electrode 24 with the fixed energizing shaft 25, the electric field intensity at the upper end of the arc shield can be reduced, and the insulation performance between the arc shield and the second shield 33 can be improved. In addition, with regard to the insulation performance between the respective contacts 28a, 28b, the same effect as that of the fifth embodiment described above can be obtained.

(Example 7)

Fig. 8 is a longitudinal sectional view showing a configuration example of the vacuum tube 20 of the vacuum switchgear of this embodiment. In FIG. 8 , the same reference numerals are assigned to the same parts as those in FIGS. 6 and 7 , and description thereof will be omitted, and only the different parts will be described here.

In the vacuum tube 20 of this embodiment, as shown in FIG. 8 , the second shield 33 surrounding the fixed electrode 24 is supported and fixed by the fixed electrode 24 .

In the vacuum tube 20 of this embodiment, by using the fixed electrode 24 to support and fix the second shield 33 surrounding the fixed electrode 24, the same effect as that of the above-mentioned embodiment 6 can be obtained, and a vacuum with excellent insulation performance can be obtained. switchgear.

(Embodiment 8)

In the vacuum tube 20 of this embodiment, in the vacuum tube 20 of Fig. 6, Fig. 7 and Fig. 8 mentioned above, the gap length between the second shield 33 and the third shield 34 is set as d ₄ , and the distance between the disconnection position When the gap length between the contacts 28a and 28b is _d2 , the relationship between the respective gap lengths _d2 and _d4 is defined as _d4 =(0.6 to 0.95)· _d2 .

In the vacuum tube 20 of this embodiment, by setting the relationship between the lengths d ₂ and d ₄ of the respective gaps as d ₄ =(0.6-0.95)·d ₂ , the movable side contact 28b and the fixed side contact 28b can be reduced in size. The contact 28a, or the electric field strength of the movable electrode 26 and the fixed electrode 24, can also optimize the electric field strength of these parts.

The characteristic diagram in FIG. 9 shows an example of the electric field strength around the second shield 33 or the third shield 34 determined by the presence or absence of these shields.

Here, the dotted line line _E0 shown at the upper end represents the electric field strength on the surface of the contact 28a or 28b when there is no second shield 33 or the third shield 34, and the curve _E1 represents the electric field intensity of the second shield 33 or the third shield 34. The electric field strength at the tip, curve _E2, represents the electric field strength at the surface of the contact 28a or 28b at the open circuit position.

The curve E ₁ is inversely proportional to the ratio d ₄ /d ₂ of the gap length, and the curve E ₂ is directly proportional to the ratio d ₄ /d ₂ of the gap length.

In addition, the breakdown electric field intensity Ea is a value when the material of the second shield 33 and the third shield 34 is stainless steel, and the breakdown electric field intensity Eb is a value when the material of the contacts 28a and 28b is copper-chromium alloy. .

The reason why the breakdown electric field intensity Eb of the contact is lower than Ea is not only due to a difference in material, but it is also considered to be due to the decrease caused by various switches such as current breaking as described above.

Therefore, as shown in FIG. 9, by setting the relationship between the gap lengths d ₂ and d ₄ as d ₄ =(0.6-0.95)·d ₂ , the electric field intensity of each contact 28a and 28b can be reduced, and a small size can be obtained. And vacuum switchgear with excellent insulation performance.

(Example 9)

In the vacuum tube 20 of this embodiment, the material of the second shield 33 and the third shield 34 is stainless steel or tungsten in the vacuum tube 20 shown in FIGS. 6 , 7 and 8 above.

In the vacuum tube 20 of this embodiment, the second shield 33 and the third shield 34 are made of stainless steel or tungsten to reduce the size of the movable side contact 28b and the fixed side contact 28a, or the size of the movable electrode. 26 and the electric field strength of the fixed electrode 24 can also improve the insulation performance between the second shield 33 and the third shield 34.

The characteristic diagram of FIG. 10 shows a comparative example of the lightning withstand voltage performance due to the difference in the material of the second shield 33 and the third shield 34 performed by the present inventors.

Materials are copper (oxygen-free copper), stainless steel (SUS34), and tungsten. In addition, the shape of the electrode used in the experiment is a flat plate electrode with a diameter of 34 mm and a gap length of 1.5 mm.

In Fig. 10, compared with copper, the withstand voltage is 1.7 times that of stainless steel and 1.9 times that of tungsten.

However, even on the surface of copper, the same effect can be obtained by coating tungsten by means of vacuum evaporation or the like, so it is only necessary to set the surface material of the shield to stainless steel or tungsten.

As described above, by using stainless steel or tungsten as the material of the second shield 33 and the third shield 34, in addition to the above-mentioned effect of relaxing the electric field, the vacuum switchgear can be miniaturized.

(Example 10)

In the vacuum tube 20 of this embodiment, in the vacuum tube 20 shown in FIGS. 6, 7 and 8, the surfaces of the second shield 33 and the third shield 34 are subjected to composite electrolytic polishing treatment or electron beam treatment (using electron beam irradiated modified layer).

In the vacuum tube 20 of this embodiment, the surface of the second shield 33 and the third shield 34 is subjected to composite electrolytic grinding treatment or electron beam treatment, so that the movable side contact 28b and the fixed side contact 28a can be reduced. Or the electric field intensity of the movable electrode 26 and the fixed electrode 24 can also improve the insulation performance between the second shield 33 and the third shield 34 .

The characteristic diagram of FIG. 11 shows a comparative example of the lightning pulse breakdown voltage due to the difference in the material of the second shield 33 and the third shield 34 performed by the present inventors.

The lightning pulse withstand voltage characteristics of the electrode ground to about 1 micron and the electrode subjected to composite electrolytic grinding treatment were compared. In addition, the electrolyte is a mixture of phosphoric acid and sulfuric acid.

Generally speaking, for insulation breakdown in vacuum, it can be seen from Figure 11 that the breakdown voltage will increase every time insulation breakdown is repeated. This is called a tuning effect, and tuning processing utilizing this phenomenon is performed in the final process of manufacturing a vacuum tube.

It can be seen from Fig. 11 that the method of composite electrolytic grinding treatment shows high insulation performance with a small number of breakdown times, and the final breakdown voltage is about 20kV higher.

As described above, by performing the composite electrolytic polishing treatment, the advantage of shortening the time required for the conditioning treatment can be obtained.

In addition, the same effect of improving the withstand voltage performance can be obtained even if this composite electrolytic polishing treatment is performed on the arc shield 32 shown in FIGS. 2 , 3 , 6 , 7 , and 8 .

The characteristic diagram in FIG. 12 shows a comparative example of withstand voltage characteristics in the case where the second shield 33 and the third shield 34 are subjected to electron beam processing for the composite electrolytic polishing process.

As can be seen from FIG. 12, the method of electron beam treatment shows high insulation performance with a small number of failures, and the final breakdown voltage becomes about 20kV higher.

As described above, by performing the electron beam treatment, an advantage of shortening the time required for the conditioning treatment can be obtained.

(Example 11)

In the vacuum tube 20 of this embodiment, in the vacuum tube 20 of _FIG . When the gap length between 27 and the ground electrode 35 is d ₅ , the relationship between the respective gap lengths d ₅ and d ₁ is defined as d ₅ =(1.3˜1.8)·d ₁ .

In the vacuum tube 20 of this embodiment, by setting the relationship between the gap lengths d ₅ and d ₁ as d ₅ =(1.3-1.8)·d ₁ , it is possible to realize the open position of the movable side contact 28b. The coordination of the insulation between the contacts and the insulation of the grounding device can improve reliability.

That is, if the 50% breakdown voltage is V ₅₀ for the margin of insulation performance at the grounded position as in the disconnected position, a margin of 3σ is required for V ₅₀ . As mentioned above, the margin of insulation performance at the open position is roughly based on 2σ for V ₅₀ . Since the ground electrode 35 does not have the duty of breaking the current, the damage on the electrode surface is relatively small.

An experiment was conducted to obtain the degree of dispersion of the breakdown voltages of the ground electrode 35 and the movable current-carrying shaft 27, and the degree of dispersion was 10 to 18% in terms of standard deviation.

From the relationship between the ratio of the gap length providing 3σ and the gap length providing 2σ (ie d ₅ /d ₁ ) and the dispersion (standard deviation) of the breakdown voltage shown in Figure 4, it can be seen that the ratio of the gap length d ₅ /d ₁ becomes 1.3 to 1.8.

With this, the insulation between the ground electrode 35 and the movable energization shaft 27 can be coordinated with the insulation of the disconnection position, and an economical and highly reliable vacuum switchgear can be obtained.

(Example 12)

13A to 13C are longitudinal sectional views showing configuration examples of the operating mechanism of the vacuum switchgear of this embodiment, respectively showing configurations at the closed position and the open position at the disconnecting position.

In FIGS. 13A to 13C , the operation mechanism 50 is configured by arranging two sets of mechanism parts 60 and 90 in series.

Here, from the side close to the vacuum tube 20, the breaking mechanism part 60 and the isolating mechanism part 90 are defined.

That is to say, the movable shaft 61 of the breaking mechanism part 60 is connected with the movable energizing shaft 27 of the vacuum tube 20 through the insulating rod 36, and the rotating shaft 91 of the isolating mechanism part 90 is engaged with the frame 62 of the breaking mechanism part 60 by the bolt part 91a. .

In addition, the breaking mechanism part 60 is a mechanism for breaking operation (switching from the closed position to the open position) requiring high-speed switching operation, and the isolation mechanism part 90 is a mechanism for switching operation from the open position to the closed position. .

Here, the breaking mechanism part 60 can use, for example, a proposed solenoid type operating mechanism, which has a permanent magnet 63 fixed on the inner periphery of the frame 62, a movable iron core 64 fixed on the movable shaft 61, and an electromagnet. A coil 65, is engaged to a coil spring 66 on the movable shaft.

The isolation mechanism part 90 accommodates the rotating shaft 91 and the motor 93 integrated therewith in the frame 92 .

In addition, the bolt portion 91a of the rotating shaft 91 is engaged with the frame 62 of the breaking mechanism portion 60 such that the engaging length S shown in FIG. 13 is greater than (d ₂ -d ₁ ).

In addition, although not shown, the frame 62 is configured so that only relative movement in the axial direction is possible with respect to the frame 92, and relative rotation is not possible.

The action of the operating mechanism of the vacuum switchgear of this embodiment will be described.

First, the operation of the breaking mechanism section 60 will be described.

In the position shown in FIG. 13A, the closed position is maintained by making the attractive force between the flange portion of the movable iron core 64 and the permanent magnet 63 exceed the compression force of the coil spring 66.

Now, in such a state, when an electric current flows in the positive direction to the electromagnetic coil 65 from an external power source not shown, the attractive force between the permanent magnet 63 and the flange of the movable iron core 64 decreases, and the rebound force of the coil spring 66 When the suction force is exceeded, the movable shaft 61 is driven toward the open position.

In the open position of Fig. 13B, the movable iron core 64 and the permanent magnet 63 have separated, for this reason, the attractive force between the two is small, and the rebound force of the coil spring 66 exceeds the attractive force to keep the open position.

The disconnection operation is completed by the above operation.

Secondly, when a reverse current flows in the electromagnetic coil 65, the electromagnetic force generated by the electromagnetic coil 65 and the permanent magnet 63 exceeds the rebound force of the coil spring 66, and the movable shaft 61 compresses the coil spring 66 while moving in the direction of the closed position. It is driven and held at the position shown in FIG. 13A by the attractive force of the permanent magnet 63, and the turning-on operation is completed.

Next, the operation of the isolation mechanism section 90 will be described.

When the rotating shaft 91 is rotationally driven by the motor 93, together with the frame 62 of the breaking mechanism part which is bolted, the movable energizing shaft 27 of the vacuum tube 20 starts to open the electrode from the open position of FIG. 13B to the breaking position of FIG. 13C.

Next, when the motor 73 is reversely rotated, the breaking mechanism part 60 and the movable energizing shaft 27 of the vacuum tube 20 move from the breaking position of FIG. 13C to the opening position of FIG.

As described above, in this embodiment, the operating mechanism of the vacuum switchgear of the first embodiment described above can be realized with a simple configuration.

In other words, by adopting a configuration in which a mechanism suitable for high-speed switching is used for the operating part of the circuit breaker and a mechanism suitable for low-speed switching is used for the operating part of the isolator, a low-cost operating mechanism can be obtained as a whole.

In addition, by combining the independent actions of the two sets of mechanism parts 60 and 90 , it is possible to obtain an operating mechanism that reliably maintains the closed position, the open position, and the disconnected position, and has high reliability.

(Modification of Embodiment 12)

In addition, in the present embodiment, the description is the case of directly combining the vacuum tube, the breaking mechanism part and the isolating mechanism part in series, but the present invention is not limited thereto, and it can also be made into such a structure that the vacuum tube It is connected and engaged in series with the breaking mechanism part or between the breaking mechanism part and the isolation mechanism part through a lever or a connecting rod.

(Example 13)

The operating mechanism of the vacuum switchgear of this embodiment is such that, in the operating mechanism of the vacuum switchgear shown in FIG. 13A to FIG. The joining length S becomes larger than (d ₃ -d ₁ ).

In the operating mechanism of the vacuum switchgear of this embodiment, the breaking mechanism part 60, as described in the twelfth embodiment mentioned above, performs breaking and closing operations from the closed position to the open position, isolating The mechanism part 90, as described in the twelfth embodiment mentioned above, performs the electrode pulling action from the open position to the closed position, but adopts the way to further rotate the motor 93, and starts from the disconnected position to the grounded position. The breaking mechanism part 60 and the movable energizing shaft 27 of the vacuum tube 20 are driven so far.

As described above, in this embodiment, the operating mechanism of the vacuum switchgear of the second embodiment described above can be realized with a simple configuration.

In other words, by adopting a configuration in which a mechanism suitable for high-speed switching is used for the operating part of the circuit breaker and a mechanism suitable for low-speed switching is used for the operating part of the isolator, a low-cost operating mechanism can be obtained as a whole.

In addition, by combining the independent actions of the two sets of mechanism parts 60 and 90 , it is possible to obtain an operating mechanism that reliably maintains the closed position, the open position, and the disconnected position, and has high reliability.

(Example 14)

Fig. 14 is a longitudinal sectional view showing a configuration example of the operating mechanism of the vacuum switchgear of this embodiment, and Fig. 14 shows the configuration at the closed position.

In FIG. 14 , the operating mechanism 50 is configured such that three sets of mechanism parts 60 , 70 , and 80 are arranged in series.

Here, from the side close to the vacuum tube 20, the breaking mechanism part 60, the isolation mechanism part 70, and the grounding mechanism part 80 are defined.

In the present embodiment, the breaking mechanism section 60, the disconnecting mechanism section 70 and the grounding mechanism section 80 are all constituted by the solenoid type operating mechanism explained in Figs. 13A to 13C.

That is to say, the movable shaft 61 of the breaking mechanism part 60 is connected with the movable energizing shaft 27 of the vacuum tube 20 through the insulating rod 36, the movable shaft 71 of the isolating mechanism part 70 is engaged with the frame 62 of the breaking mechanism part 60, and the grounding mechanism The movable shaft 81 of the part 80 engages with the frame 72 of the isolation mechanism part 70 .

In the operating mechanism of the vacuum switchgear of the present embodiment, the solenoid type operating mechanism of the breaking mechanism portion 60 performs breaking and connecting from the closed position to the open position by means of a current from an external power source not shown. pass action.

Also, by similarly driving the solenoid operating mechanism of the isolating mechanism portion 70, the movable energizing shaft 27 of the vacuum tube 20 and the breaking mechanism portion 60 perform switching operations from the open position to the breaking position.

In addition, by driving the solenoid-type operating mechanism of the grounding mechanism part 80, the movable energizing shaft 27 of the vacuum tube 20, the breaking mechanism part 60 and the isolating mechanism part 70 perform switching operations from the breaking position to the grounding position.

As described above, in this embodiment, the operating mechanism of the vacuum switchgear of the second embodiment described above can be realized with a simple configuration.

In addition, by combining the independent actions of the three sets of mechanism parts 60, 70, and 80, it is possible to securely maintain the closed position, the open position, the disconnected position, and the grounded position, and operate with high reliability. mechanism.

(Modification of Embodiment 14)

In addition, in the present embodiment, although the description is the situation in which three sets of solenoid operating mechanisms are arranged in series to form the operating mechanism, the present invention is not limited thereto, and may also be made into such a configuration: A solenoid operating mechanism suitable for high-speed switches is used in the operating part of the circuit breaker, and other operating mechanisms suitable for low-speed switches are used in the operating part of the isolator and grounding device. In this case, as All can get the operating mechanism at a low price.

(Example 15)

15A to 15C are longitudinal sectional views showing configuration examples of the operating mechanism of the vacuum switchgear of this embodiment, respectively showing the configurations at the closed position, the open position, and the disconnection position.

In addition, in FIG. 15A to FIG. 15C, the same reference numerals are assigned to the same elements as in the above-mentioned embodiment.

In FIG. 15A, the operating mechanism 150 is arranged in series with a breaking mechanism part 160 close to the vacuum tube 20 and an isolation mechanism part 170 far from the vacuum tube 20, and each mechanism part is constituted by a bistable solenoid operating mechanism.

That is, a movable shaft 161a made of a nonmagnetic material such as stainless steel is mounted on the movable iron core 161 of the breaking mechanism part 160, and the movable shaft 161a is slidably supported in a guide member 166a made of a nonmagnetic material. And it is assembled on the movable electric shaft 27 through the insulating rod 36 .

In addition, electromagnetic coils 165a and 165b are arranged around the movable iron core 161, and a yoke 162 is arranged outside the electromagnetic coils 165a and 165b.

Furthermore, a permanent magnet 163 is fitted in the yoke 162 between the electromagnetic coils 165a and 165b, and the permanent magnet 163 is magnetized in the inner and outer directions so that, for example, the inner side becomes an N pole and the outer side becomes an S pole.

In addition, inside the permanent magnet 163, a guide yoke 167 is mounted.

On the other hand, the isolating mechanism part 170 has the same structure as the above-mentioned breaking mechanism part 160, and the movable shaft 171a made of a non-magnetic material is assembled on the movable iron core 171, and the movable shaft 171a is fixed to the yoke of the breaking mechanism part 160. 162 , the top end portion freely slides to guide the movable shaft 161b of the breaking mechanism portion 160 .

In addition, around the movable iron core 171, electromagnetic coils 175a, 175b, and a permanent magnet 173 magnetized in the inner and outer directions are arranged, and around the electromagnetic coils 175a and 175b, a yoke 172 is assembled, and the yoke 172 is fixed to the operating mechanism 150. on an undrawn pedestal.

In the operating mechanism of the vacuum switchgear of this embodiment, in the closed position shown in FIG. 15A, no matter which electromagnetic coil is in the unexcited state, the upper end of the movable iron core 161 of the circuit breaking mechanism part 160, by means of a permanent The magnetic force of the magnet 163 is attracted to the upper side of the yoke 162, forming a closed magnetic circuit in the direction indicated by the arrow in FIG. 15A.

Also, in the isolation mechanism portion 170 , the movable core 171 is attracted to the yoke 172 .

Next, in this state, when the electromagnetic coils 165b and 175b are excited so that magnetic flux is generated in the direction of the arrow shown in FIG. 162, the movable electrode 26 reaches the open position d ₁ .

In this case, although the impact when the movable core 161 and the yoke 162 collide is transmitted to the movable shaft 171b of the isolating mechanism portion 170, the position maintaining force of the movable core 172 of the isolating mechanism portion 170 is suppressed. The excitation of the electromagnetic coil 175a is strengthened, so the movable iron core 171 is held securely. In this way, after the electrodes are driven, if the excitation of the electromagnetic coil is stopped, the position can be held by the action of the permanent magnet 163 and the permanent magnet 173 in the same manner as above.

In addition, in order to perform a closed-circuit operation, as long as the electromagnetic coil 165a and the electromagnetic coil 175b are simultaneously excited so as to generate magnetic flux in the direction shown in FIG. Closed circuit action.

Furthermore, for the breaking operation, as long as the electromagnetic coil 175b of the isolation mechanism part 170 and the electromagnetic coil 165a of the breaking mechanism part 160 are simultaneously excited so as to generate magnetic flux in the direction shown in FIG. With the position of the movable core 161 of the isolating mechanism section 160 maintained, the position of the movable electrode 27 is brought to the disconnection position d ₂ .

In addition, the operation of returning to the open circuit position _d1 from such a state can also be reliably performed in the same manner.

As described above, in this embodiment, since the movement between the open position and the closed position can be realized by only a high-speed reciprocating movement of the movable electrode, the opening and closing operations can be reliably performed. In addition, since the bistable solenoid operating mechanism is arranged in series, the three positions of the closed position, the open position, and the disconnected position can be reliably held by the attractive force of the permanent magnet. In addition, since the position holding force of the other movable iron core is strengthened when one movable iron core is driven, the position can be reliably maintained even if an impact force or the like acts. Therefore, a compact and highly reliable vacuum switchgear can be realized.

(Modification of Embodiment 15)

In addition, in this embodiment, although the case where the electromagnetic coil is excited to strengthen the holding force of the movable iron core on the non-driven side is described, it is not limited to this, and the permanent magnet is used only for the attraction force. Excitation may not be performed if sufficient holding is possible.

In addition, although the case where the movable electrode and the breaking mechanism part 160 and the isolating mechanism part 170 are arranged in series is described, the present invention is not limited thereto. Even if the arrangement itself is not in series, as long as the force transmission is in series, even The same action and effect can also be obtained by making it a lever or connecting rod that can swing freely, as already mentioned.

In addition, a configuration may be adopted in which a wipe spring mechanism for generating a force for pressing the closed electrode in the closing direction may be further provided between the movable shaft of the breaking mechanism 160 and the movable electrode.

Furthermore, although it has been described as a configuration in which the permanent magnet is mounted on the yoke, the present invention is not limited thereto, and may be mounted on the movable iron core as long as it is at both ends of the moving range of the movable iron core. A bistable solenoid operating mechanism capable of holding the position by the attractive force of the permanent magnet is sufficient.

(Example 16)

16A to 16D are longitudinal sectional views showing an example of the configuration of the operating mechanism of the vacuum switchgear of the embodiment, respectively showing the configurations at the closed position, the open position, the disconnected position and the grounded position.

In Fig. 16A, the operating mechanism 350 is composed of: an isolation mechanism part 360 composed of the bistable solenoid operating mechanism described in Figs. The isolation mechanism part 370 constituted by the device is arranged in series.

That is, the movable iron core 361 of the breaking mechanism part 360 is assembled to the movable current-carrying shaft 27 through the insulating rod 36, and the electromagnetic coils 365a and 365b are assembled around the electromagnetic coil 361, and the yokes are assembled around the electromagnetic coils 365a and 365b. 362.

In addition, the permanent magnet 363 is attached to the inside of the yoke 362 in the same manner as in the states described in FIGS. 15A to 15C .

Furthermore, on the movable iron core 371 of the isolation mechanism part 370 connected to the yoke 362 of the circuit breaking mechanism part 360, convex parts 371a, 371b, 371c, 371d are formed, and electromagnetic coils 375a, 375b are mounted on the outside thereof. Around 375a, 375b, yoke 372 is attached.

On the other hand, on the inside of the yoke 372, permanent magnets 363a, 363b, 363c, 363d are installed on the positions facing the above-mentioned convex parts 371a, 371b, 371c, 371d of the movable iron core 371, respectively, and the permanent magnets 373a and 373b are magnetized. The permanent magnets 373c and 373d are magnetized so that the inside becomes the N pole and the outside becomes the S pole, so that the inside becomes the S pole and the outside becomes the N pole.

In addition, a yoke 372 is fixed to an unillustrated base of the operating mechanism 350 .

In the operating mechanism of the vacuum switchgear of this embodiment, at the closed position shown in FIG. 16A, the movable core 361 and the movable core 371 are attracted to the yoke 362 by the magnetic forces of the permanent magnet 363 and the permanent magnets 373a, 373b, respectively. And on the yoke 372.

Next, in such a state, when the electromagnetic coil 365b of the movable iron core 361 is excited so as to generate a magnetic flux in the direction indicated by the arrow in FIG. Then only the movable iron core 361 moves to the lower side in the drawing at high speed to perform the open circuit operation, and at the same time, the position of the movable iron core 371 can be reliably maintained to realize the reliable open circuit operation.

Furthermore, if in such a state, while exciting the electromagnetic coil 375a of the isolation mechanism portion 370 so as to generate a magnetic flux in the direction opposite to the arrow shown in FIG. 16B, the electromagnetic coil b is excited so as to reinforce the breaking mechanism. The position holding force of the movable iron core 361 of the part 360, the movable iron core 371 moves to the lower side in the figure, and reaches the state of FIG. 16C, realizing the circuit breaking operation.

In the state of Fig. 16C, the permanent magnets 373a, 373b, 373c, 373d, and the convex parts 371a, 371b, 371c, 371d of the movable iron core face each other to form a closed magnetic circuit shown by the arrows in Fig. 16C, which can be stably maintained. Location.

Furthermore, in such a state, while exciting the electromagnetic coils 375a, 375b of the isolation mechanism part 370 so as to generate magnetic fluxes in the directions shown in FIG. 16D, the electromagnetic coil 375b is excited to strengthen The electromagnetic coil 375b and the position holding force of the movable iron core 361 of the circuit breaking mechanism part 360, then the movable iron core 371 will further move to the lower side in the figure to reach the state of FIG. 16D and realize the grounding action.

In the state of FIG. 16D, the movable iron core 371 is attracted to the yoke 372 by the magnetic force of the permanent magnets 373c and 373d, and the position can be stably maintained.

As described above, in this embodiment, the movement between the open position and the closed position can be reliably performed only by the high-speed reciprocating movement of one movable electrode. In addition, since the electromagnetic actuators for stably maintaining the three positions are arranged in series, the four positions of the closed position, the open position, the disconnection position and the ground position can be reliably maintained by the attractive force of the permanent magnet. In addition, since the position holding force of the other movable iron core is strengthened when one movable iron core is driven, the position can be reliably maintained even when an impact force or the like acts. Therefore, a vacuum switchgear having a simple and highly reliable operating mechanism can be realized.

(Modification of Embodiment 16)

Although the case of driving the movable iron core is mainly described in this embodiment, the present invention is not limited thereto, and a sensor for detecting the position of the movable iron core may also be provided to further improve reliability.

(Example 17)

Fig. 17 is a longitudinal sectional view showing a configuration example of the operating mechanism of the vacuum switchgear of this embodiment, and Fig. 17 shows the configuration at the closed position.

In Fig. 17, the operating mechanism 250 starts from the side close to the vacuum tube 20 and consists of a breaking mechanism part 260, an isolating mechanism part 270, and a grounding mechanism part 280. type solenoid operating mechanism.

That is to say, the movable iron core 261 of the breaking mechanism part 260 is connected to the movable energizing shaft 27 through the insulating rod 36, the movable iron core 271 of the isolating mechanism part 270 is connected to the yoke iron 262 of the breaking mechanism part 260, and the grounding mechanism part 280 The movable core 281 is connected to the yoke 272 of the isolation mechanism part 270 .

Electromagnetic coils 265a, 265b, 275a, 275b, 285a, 285b and permanent magnets 263, 273, 283 are respectively mounted on the above-mentioned three mechanism parts.

In addition, a yoke 282 of the ground mechanism portion 280 is fixed to an unillustrated base of the operating mechanism 250 .

In the operation mechanism of the vacuum switchgear of the present embodiment, the operation is almost the same as that described with reference to Figs. 15A to 15C.

That is to say, the switching action between the closed position and the open position is performed by means of the action of the breaking mechanism part 260, the switching action between the open position and the breaking position is performed by means of the action of the isolation mechanism part 270, and the switching action is performed by means of the action of the grounding mechanism part 280. Switching action between open position and ground position.

In addition, when the movable iron core of one mechanism part is driven, each electromagnetic coil is excited, so that the holding force of the positions of the other two movable iron cores is enhanced.

As mentioned above, in this embodiment, since three solenoid operating mechanisms of the bistable type are arranged in series, the four positions of the closed position, the open position, the disconnection position and the ground position can be controlled by permanent magnets. Attractiveness is maintained surely. In addition, since the position holding force of the other movable iron cores is strengthened when one movable iron core is driven, the position can be reliably maintained even when an impact force or the like acts. Therefore, a vacuum switchgear having a simple and highly reliable operating mechanism can be realized.

Claims (20)

1. a vacuum switching device has

Enclosed the vacuum tube (20) at two ends of the insulating vessel (21) of dielectric with the 1st and the 2nd hardware (22,23) gas-tight seal, above-mentioned vacuum tube (20) has: connect above-mentioned the 1st hardware (22), and be fixed on the fixed electrode (24) on above-mentioned the 1st hardware (22); When connecting above-mentioned the 2nd hardware (23), be fixed to above-mentioned the 2nd hardware (23) by bellows (29) and go up and be set to and said fixing electrode (24) movable electrode (26) in opposite directions,

And make above-mentioned movable electrode (26) close the operating mechanism (60,90) that moves to linearity on position, open position, these 3 positions of off position.

2. a vacuum switching device has

The two ends of insulating vessel (21) of having enclosed dielectric are with the vacuum tube (20) of the 1st and the 2nd hardware (22,23) gas-tight seal, above-mentioned vacuum tube (20) has above-mentioned the 1st hardware (22) of perforation, and is fixed on the fixed electrode (24) on above-mentioned the 1st hardware (22); When connecting above-mentioned the 2nd hardware (23), be fixed to above-mentioned the 2nd hardware (23) by bellows (29) and go up and be set to and said fixing electrode (24) movable electrode (26) in opposite directions; Be located at above-mentioned movable electrode (26) and grounding electrode (35) the opposite side of fixed electrode (24),

And make above-mentioned movable electrode (26) close the operating mechanism (60,70,80) that moves to linearity on these 4 positions of position, open position, off position and earthing position.

3. claim 1 or 2 described vacuum switching devices is characterized in that: the gap length between the contact of above-mentioned open position is being decided to be d ₁, the gap length between the contact of above-mentioned off position is decided to be d ₂Situation under, each gap length d ₁, d ₂Relation be set at d ₂=(1.3～2.6) d ₁

4. claim 1 any one resembles described vacuum switching device in the claim 3, it is characterized in that:

Also possess be provided with arc shield (32) that said fixing electrode (24) and above-mentioned movable electrode (26) are surrounded,

Gap length separately between above-mentioned arc shield (32) and said fixing electrode (24) and movable electrode (26) is being decided to be d ₃, the gap length between the contact of above-mentioned off position is decided to be d ₂Situation under, above-mentioned each gap length d ₂, d ₃Relation be set at d ₃=(0.35～0.8) d ₂

5. claim 1 any one described vacuum switching device in the claim 4 is characterized in that:

Also possess the inside of being located at above-mentioned arc shield (32), and the 3rd shielding (34) of surrounding the 2nd shielding (33) of said fixing electrode (24) and surrounding above-mentioned movable electrode (26),

Above-mentioned the 2nd shielding (33) and above-mentioned the 3rd shielding (34) support are fixed on the above-mentioned the 1st and the 2nd hardware (22,23).

6. the described vacuum switching device of claim 5 is characterized in that: above-mentioned the 2nd shielding (33) support is fixed on the energising axle (25) that is connected on the said fixing electrode (24).

7. the described vacuum switching device of claim 5 is characterized in that: shield (33) to the above-mentioned the 2nd and support to be fixed to be connected on the said fixing electrode (24).

8. the described vacuum switching device of any one in the claim 5 to 7 is characterized in that: the gap length between above-mentioned the 2nd shielding (33) and above-mentioned the 3rd shielding (34) is being decided to be d ₄, the gap length between the above-mentioned contact of above-mentioned off position is decided to be d ₂Situation under, above-mentioned each gap length d ₂, d ₄Relation be set at d ₄=(0.6～0.95) d ₂

9. the described vacuum switching device of any one in the claim 5 to 8 is characterized in that: the material of above-mentioned the 2nd shielding (33) and the 3rd shielding (34) is decided to be stainless steel.

10. the described vacuum switching device of any one in the claim 5 to 8 is characterized in that: the material of above-mentioned the 2nd shielding (33) and the 3rd shielding (34) is decided to be tungsten.

11. the described vacuum switching device of any one in the claim 5 to 9 is characterized in that: the combined electrolysis milled processed is carried out on the surface to above-mentioned the 2nd shielding (33) and above-mentioned the 3rd shielding (34).

12. the described vacuum switching device of any one in the claim 5 to 9 is characterized in that: the upgrading layer that setting is formed by the irradiation of electron beam on the surface of above-mentioned the 2nd shielding (33) and above-mentioned the 3rd shielding (34).

13. the described vacuum switching device of claim 2 is characterized in that: be fixed on the above-mentioned movable electrode (26) the energising axle and with it the gap length between in opposite directions the grounding electrode (35) be decided to be d ₅, the gap length between the contact of above-mentioned open position is decided to be d ₁Situation under, above-mentioned each gap length d ₁, d ₅Relation be set at d ₅=(1.3～1.8) d ₁

14. the described vacuum switching device of any one in the claim 1,3～13 is characterized in that:

Aforesaid operations mechanism has in series configuration and disconnecting mechanism part (60) of moving to linearity respectively and interrupter part (90) between 2 positions,

The framework of above-mentioned disconnecting mechanism part (60) is attached on the moving part of above-mentioned interrupter part (90), and above-mentioned interrupter part (90) is carried out from above-mentioned gap length d ₁Begin to above-mentioned gap length d ₂Till switch motion.

15. the described vacuum switching device of any one in the claim 2,3～13 is characterized in that:

Aforesaid operations mechanism has in series configuration and respectively in the disconnecting mechanism part (60) of linearity ground action between 2 positions with comprising the interrupter part (90) of linearity ground action between 3 positions of intermediate point,

The framework of above-mentioned interrupter part (60) is attached on the above-mentioned movable electrode (26), carries out above-mentioned gap length d ₁Switch motion,

The framework of above-mentioned disconnecting mechanism part (60) is attached on the moving part of above-mentioned interrupter part (90), and above-mentioned interrupter part (90) is carried out from above-mentioned gap length d ₁Begin to above-mentioned gap length d ₂Till and from above-mentioned gap length d ₂Begin to above-mentioned gap length d ₃Till the switch motion in 2 stages.

16. the described vacuum switching device of any one in the claim 2,3～13 is characterized in that:

Aforesaid operations mechanism has in series configuration and the disconnecting mechanism part (60) of moving to linearity respectively and interrupter part (70) and earthing mechanism part (80) between 2 positions,

The framework of above-mentioned disconnecting mechanism part (60) is attached on the above-mentioned movable electrode (26), carries out above-mentioned gap length d ₁Switch motion,

The framework of above-mentioned disconnecting mechanism part (60) is attached on the moving part of above-mentioned interrupter part (70), and above-mentioned interrupter part (70) is carried out from above-mentioned gap length d ₁Begin to above-mentioned gap length d ₂Till switch motion,

The framework of above-mentioned interrupter part (70) is attached on the moving part of above-mentioned earthing mechanism part (80), and above-mentioned earthing mechanism part (80) is carried out from above-mentioned gap length d ₂Begin to above-mentioned gap length d ₃Till switch motion.

17. the described vacuum switching device of claim 14 is characterized in that:

Each side in above-mentioned disconnecting mechanism part (160) and the above-mentioned interrupter part (170), solenoid mechanism of apparatus power backup magnetic coil, yoke, movable core and permanent magnet all perhaps also possesses the solenoid mechanism formation of spring as required,

The moving part of above-mentioned disconnecting mechanism part (160) is the movable core of the 1st solenoid mechanism, the framework of above-mentioned disconnecting mechanism part (160) is the yoke of the 1st solenoid mechanism, the moving part of above-mentioned interrupter part (170) is the movable core of the 2nd solenoid mechanism, the framework of above-mentioned interrupter part (170) is the yoke of the 2nd solenoid mechanism

Above-mentioned each movable core, all by means of above-mentioned solenoid and permanent magnet magnetic force, perhaps also carry out reciprocating action as required by means of the recuperability of above-mentioned spring, simultaneously, at the two ends of the actuating range of above-mentioned movable core by means of the attraction of above-mentioned permanent magnet or also come the holding position as required by means of the recuperability of above-mentioned spring.

18. the described vacuum switching device of claim 14 is characterized in that:

The solenoid mechanism of apparatus power backup magnetic coil, yoke, movable core and permanent magnet, the solenoid mechanism that perhaps also possesses spring as required constitutes above-mentioned disconnecting mechanism part (360),

The moving part of above-mentioned disconnecting mechanism part (360) is the movable core of above-mentioned solenoid mechanism, and the framework of above-mentioned disconnecting mechanism part (360) is above-mentioned yoke,

Above-mentioned movable core, by means of above-mentioned solenoid and permanent magnet magnetic force, perhaps also carry out reciprocating action as required by means of the recuperability of above-mentioned spring, simultaneously, at the two ends of the actuating range of above-mentioned movable core by means of the attraction of above-mentioned permanent magnet or also come the holding position as required by means of the recuperability of above-mentioned spring

Above-mentioned interrupter part (370) be possess solenoid, formed protuberance yoke, formed the movable core of protuberance and the electromagnetic actuators of permanent magnet opposite to each other with the protuberance of above-mentioned yoke, the moving part of above-mentioned interrupter part (370) is the movable core of above-mentioned electromagnetic actuators

The framework of above-mentioned interrupter part (370) is the yoke of above-mentioned electromagnetic actuators,

Above-mentioned movable core is when carrying out reciprocating action by means of the attraction of above-mentioned solenoid and permanent magnet, when the holding position was come by means of the attraction of above-mentioned permanent magnet in the two ends of the actuating range of above-mentioned movable core, the protuberance that makes the protuberance of above-mentioned yoke and above-mentioned movable core by means of the attraction of above-mentioned permanent magnet at the place, centre position of above-mentioned actuating range is the holding position opposite to each other.

19. the described vacuum switching device of claim 16 is characterized in that:

Each side in above-mentioned disconnecting mechanism part (260) and above-mentioned interrupter part (270) and the earthing mechanism part (280), solenoid mechanism of apparatus power backup magnetic coil, yoke, movable core and permanent magnet all, the solenoid mechanism that perhaps also possesses spring as required constitutes

Above-mentioned disconnecting mechanism part, (260) moving part is the movable core of the 1st solenoid mechanism, above-mentioned disconnecting mechanism part, (260) framework is the yoke of the 1st solenoid mechanism, above-mentioned interrupter part, (270) moving part is the movable core of the 2nd solenoid mechanism, above-mentioned interrupter part, (270) framework is the yoke of the 2nd solenoid mechanism, the moving part of above-mentioned earthing mechanism is the movable core of the 3rd solenoid mechanism, above-mentioned earthing mechanism part, (280) framework is the yoke of the 3rd solenoid mechanism

Above-mentioned each movable core, all by means of above-mentioned solenoid and permanent magnet magnetic force, perhaps also carry out reciprocating action as required by means of the recuperability of above-mentioned spring, simultaneously, at the two ends of the actuating range of above-mentioned movable core by means of the attraction of above-mentioned permanent magnet or also come the holding position as required by means of the recuperability of above-mentioned spring.

20. the described vacuum switching device of any one in the claim 16 to 19 is characterized in that:

Make under the situation that movable core moves in the solenoid of the solenoid of above-mentioned solenoid mechanism or above-mentioned electromagnetic actuators any one being carried out excitation, solenoid to other carries out excitation, strengthens other the not confining force of the position of mobile movable core.

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