TW202228174A - Switch and gas insulated switching device - Google Patents

Abstract

A switch (100) including a fixed side terminal (2) having a shaft rod (9) and a spring (10) for urging the shaft rod (9), and a movable side terminal (1) arranged to face the fixed side terminal (2) and having a movable electrode rod (3) that is connectable and detachable to ensure electrical continuity with the fixed side terminal (2), wherein the fixed side terminal (2) is supported by a plurality of insulating support portions (5, 7, 15) with one end fixed and provided at positions symmetrical with respect to the moving axis of the movable electrode rod (3), so as to disperse the impact force at the time of opening a circuit.

Description

Switches and gas-insulated switchgear

The present disclosure relates to switchgear and gas insulated switchgear.

There is known a technique in which a snap-action mechanism (quick-cut mechanism) is provided as an arc-extinguishing structure in order to improve the current blocking performance of the switch. The quick-action mechanism is a technology that increases the speed of the contact loop when the contact forms a loop, and extends the arc to the length necessary for arc suppression within the time without contact damage, so as to improve the blocking performance. .

The applicant has proposed a switch having a structure in which a snap-action mechanism is not provided in a limited space on the movable electrode rod side (for example, refer to Patent Document 1). The switch disclosed in Patent Document 1 operates in such a manner that, when the circuit is closed, the movable electrode rod provided inside the movable terminal arranged opposite to the fixed terminal is moved, thereby securing the fixed terminal and the fixed terminal. When the conduction between the movable side terminals is opened, the current between the stationary side terminals and the movable electrode rod is blocked by the snap action mechanism provided in the stationary side terminals. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 5179278

[The problem to be solved by the invention]

The quick-action mechanism system described in Patent Document 1 includes a shaft rod electrically connected to a fixed side terminal, a contact point for receiving an arc generated when an open circuit occurs at the tip of the shaft rod, and a coupler for coupling the shaft rod and a movable electrode rod. , and a spring that drives the shaft in the opposite direction to the movable terminal. In addition, there is a structure in which the movable electrode rod and the shaft rod are coupled when the circuit between the fixed-side terminal and the movable-side terminal is closed, and when the circuit is opened, the spring is released at a predetermined position, whereby the movable electrode rod is energized. Separate from the shaft rod to block the current. Therefore, by releasing the energy of the spring when the open circuit is performed, after the movable electrode rod and the shaft rod are separated from each other, a shock force is generated when the movable contact and the fixed-side terminal abut. Conventionally, the movable-side terminal and the fixed-side terminal were supported in a cantilever state, and a large load was generated in the direction of the support portion of the fixed-side terminal and the movable-side terminal due to the shock force generated during switching. Therefore, in order to correspond to the blocking current of a level capable of withstanding the shock force, or due to the increase of the shock force, there are restrictions such as limitations on the speed-up of the snap-action mechanism.

The present application discloses a technique for solving the above-mentioned problems, and aims to provide a switch which disperses the impulse generated when the current is interrupted and has a stable current interrupting function. [Means of Solving Problems]

The switch disclosed in the present application includes: a fixed-side terminal having a movable contact; and a movable-side terminal arranged opposite to the fixed-side terminal, and the movable-side terminal has a function to ensure electrical properties with the fixed-side terminal A movable electrode rod that can be connected/separated through conduction; the movable side terminal is fixed on the opposite side of the side opposite to the fixed side terminal; the movable contact point is provided with: a shaft rod, which is coaxial with the movable electrode rod and a spring to push the shaft rod; when the fixed side terminal and the movable side terminal are closed, one end of the movable electrode rod is coupled to the movable contact point; between the fixed side terminal and the movable side terminal When the side terminal is open, the movable electrode rod moves in the direction of the movable side terminal in a state of being coupled to the movable contact, thereby accumulating the energy of the spring, and when the movable electrode rod reaches a predetermined position, The spring will release energy to move the shaft rod toward the fixed-side terminal, thereby separating the movable contact from the movable electrode rod; wherein the fixed-side terminal is supported by a plurality of insulating support parts, the A plurality of insulating support parts are arranged at positions symmetrical with respect to the axis of movement of the movable electrode rod, and one end is fixed. [Inventive effect]

According to the switch disclosed in the present application, the fixed-side terminal can be supported from a plurality of directions symmetrical in the axial direction, thereby dispersing the impulse generated when the current is interrupted (when the circuit is closed), so that a stable current interrupting function can be obtained. .

Hereinafter, the present embodiment will be described with reference to the drawings. In addition, in each figure, the same code|symbol shows the same or a corresponding part. The switchgear of the present embodiment is used for a gas-insulated switchgear installed in, for example, a substation of a power company and a power receiving point of a general customer.

Embodiment 1. Hereinafter, the switch according to the first embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a main part showing the structure of the switch according to the first embodiment. In the figure, the switch 100 is in an open state. In the switch 100, the upper part of each of the movable-side terminal 1 and the fixed-side terminal 2 is supported by a first insulating support part 5 having one end fixed to the flange 4, and the movable-side terminal 1 and the fixed-side terminal 2 are opposed to each other. configuration. The lower part of the movable side terminal 1 is supported by the support conductor 6 connected to the movable side of the flange 4, and the lower part of the fixed side terminal 2 is provided with a connecting part 13 for connecting with the second insulating support part 7, and is fixed to the support conductor. The second insulating support portion 7 of 6 is connected to the connecting portion 13 to support the fixed-side terminal 2 . Furthermore, the support conductor 6 is provided with a conductor at the center, the periphery is covered with an insulator, and is supported by being connected to a bushing 16 fixed to the flange 4 . Inside the connecting portion 13 , countersunk holes are provided in two orthogonal directions, one of the countersunk holes connects the fixed-side terminal 2 and the connecting portion 13 , and the other orthogonal countersunk hole connects the second insulating support portion 7 to the connecting portion 13 . connecting part 13 . The bolts used for these connections protrude from the connecting portion 13 to suppress the occurrence of electric field concentration.

The fixed-side terminal 2 has a cylindrical outer shape, a shaft rod 9 of the movable contact 8 is arranged along the axis of the cylinder on the movable-side terminal 1 side, and a spring 10 is provided around the shaft rod 9 . The movable side terminal 1 is provided with a movable electrode rod 3 in a coaxial manner with the shaft rod 9 of the fixed side terminal 2, and the switch 100 is closed by coupling one end of the movable electrode rod 3 with the movable contact 8. The coupling between the movable electrode rod 3 and the movable contact 8 is released, and the switch 100 is opened. Moreover, the other end of the movable electrode rod 3 is connected to the movable shaft 11, and the movable shaft 11 is connected to the operation mechanism part 12 outside the flange 4 via, for example, bellows. The movable shaft 11 , the movable electrode rod 3 and the shaft rod 9 are coaxial.

Next, a snap-action mechanism having a current blocking function in the switch 100 will be described. FIG. 2 is a partial enlarged view of the fixed-side terminal 2 , and is a diagram showing the structure of the movable contact 8 . As mentioned above, the movable contact 8 has the shaft rod 9 and the spring 10 provided around it. As described below, when the circuit is closed, one end of the movable electrode rod 3 is coupled to the movable contact 8 and electrically connected to the shaft rod 9 . connect. Furthermore, the shaft rod 9 is positioned by the stationary end 14 in the open circuit position. FIG. 3 is a diagram showing that the switch 100 is in a closed state. FIG. 4 is a diagram showing a state in transition from the closed circuit state of FIG. 3 to the open circuit state of FIG. 1 , that is, an open circuit operation.

In FIG. 3 , when the circuit is closed, the movable electrode rod 3 is moved in the direction of the fixed-side terminal 2 via the movable shaft 11 by the operation mechanism portion 12 . Then, the movable electrode rod 3 is inserted into the fixed-side terminal 2 , and the spring 10 is pushed in and coupled to the movable contact 8 , so that the movable-side terminal 1 and the fixed-side terminal 2 are electrically connected.

In FIG. 4 , when the switch 100 starts to perform the open-circuit operation, the movable electrode rod 3 is moved to the movable side terminal 1 side by the operation mechanism part 12 , and the shaft rod 9 of the movable contact 8 is maintained in contact with the movable electrode rod 3 In the coupled state, it moves toward the movable terminal 1 side, and the spring 10 constituting the movable contact 8 is charged in an extended manner. When the movable electrode rod 3 or the shaft rod 9 reaches a predetermined predetermined position, the coupling between the movable contact point 8 and the movable electrode rod 3 will be released, so that the spring 10 is released. The movable contact 8 is accommodated in the fixed-side terminal 2, and the movable electrode rod 3 is accommodated in the movable-side terminal 1, and the open-circuit operation is completed, and the open-circuit state in FIG. 1 is achieved.

4 to the state of FIG. 1, when the spring 10 releases energy, the movable contact 8 moves into the fixed side terminal 2, and the shaft rod 9 abuts against the stationary end 14, thus causing a shock force. The switch must be constructed to withstand this shock. FIG. 5 is a diagram corresponding to a comparative example of Embodiment 1, and is different from FIG. 1 in that the second insulating support portion 7 is not provided, and the fixed-side terminal 2 is not supported from below. In the case of the structure shown in Fig. 5, when the circuit is open, the movable contact 8 is accommodated in the fixed side terminal 2. When the shaft rod 9 abuts against the stationary end 14, an impact force is generated, and a load acts on the fixed side in the horizontal direction. As for the terminal 2 , since the fixed-side terminal 2 is supported by the first insulating support portion 5 using a cantilever structure, there will be a load acting upward on the first insulating support portion 5 as indicated by the arrow in the figure. In this structure, in order to improve the current blocking performance, it is conceivable to increase the load of the spring 10 to increase the switching speed. However, depending on the increase of the shock force of the stored energy of the spring 10 , there is a possibility that the first insulating support portion 5 may be deformed or broken.

In the first embodiment, as shown in FIGS. 1 , 3 and 4 , the upper portion of the fixed-side terminal 2 is supported by the first insulating support portion 5 , and the upper portion of the fixed-side terminal 2 is supported by the second insulating support portion 7 , which is symmetrical with respect to the movable shaft 11 . The lower part of the terminal 2 on the fixed side of the position. The first insulating support portion 5 and the second insulating support portion 7 are symmetrical and parallel with respect to the movable shaft 11 to support the fixed-side terminal 2 . That is, the first insulating support portion 5 and the The second insulating support portion 7 .

In addition, in this Embodiment 1, although the structure of the switch for single-phase is shown in FIG. 1, FIG. 3, and FIG. 4, in the switch for three-phase, three of these devices are arranged in the horizontal direction. That is, the switch is constituted by arranging three of them in the depth direction in the drawing. In this case, by arranging the first insulating support portion 5 and the second insulating support portion for supporting the fixed-side terminal 2 in the vertical direction, the distance between the three-phase devices can be reduced.

It is preferable to form the following structure: the first insulating support portion 5 and the second insulating support portion 7 are formed by using, for example, epoxy resin, etc., to support the first insulating support portion 5 and the second insulating support portion 5 when a switch shock occurs. The amount of elastic deformation of the portion 7 is adjusted to be equal, so that the load does not act so as to be biased toward either one of the first insulating support portion 5 and the second insulating support portion 7 . By setting it as such a structure, it can suppress that a shock force propagates to the flange 4 which supports the switch 100. Therefore, the switching speed can be increased without increasing the strength of the flange 4, and the current blocking performance can be improved.

As described above, according to the switch 100 of the first embodiment, the fixed-side terminal 2 can be supported by the first insulating support portion 5 and the second insulating support portion 7 at positions symmetrical with respect to the movable shaft 11, and the first insulating support portion 5 And the second insulating support portion 7 is parallel to the movable shaft 11 and has one end fixed to the flange 4, so the impact of the switching action of the switch 100 can be dispersed by the first insulating support portion 5 and the second insulating support portion 7 It can provide a switch with stable current blocking function.

In addition, since the fixed-side terminal 2 is supported by the first insulating support portion 5 and the second insulating support portion 7 to disperse the load, the mechanical The strength is designed to be lower than before, and the miniaturization of the switch can be realized, and the reduction of the installation space of the switch and the reduction of the cost of the switch can be expected.

Embodiment 2. Hereinafter, the switch according to the second embodiment will be described with reference to FIG. 6 . FIG. 6 is a cross-sectional view of a main part showing the structure of the switch according to the second embodiment. In the figure, the switch 100 is in an open state. The difference from FIG. 1 is that the lower portion of the fixed-side terminal 2 is supported by the second insulating support portion 15 directly fixed to the flange 4 . Since the other structures are the same as those of the first embodiment, descriptions thereof will be omitted.

In FIG. 6 , the second insulating support portion 15 is directly fixed to the flange 4 , and the movable side support conductor 6 is fixed to the flange 4 independently of the second insulating support portion 15 . As in the first embodiment, the second insulating support portion 15 and the first insulating support portion 5 are formed such that the distance L1 between the movable shaft 11 and the first insulating support portion 5 and the distance L2 between the movable shaft 11 and the second insulating support portion 15 are approximately In the same manner, it is arranged to be parallel to the movable shaft 11 at a position symmetrical with respect to the movable shaft 11 . In addition, the elastic deformation amounts of both the second insulating support portion 15 and the first insulating support portion 5 are adjusted to be equal. In this way, the lower portion of the fixed-side terminal 2 is directly supported by the second insulating support portion 15 , so that it is not necessary to provide the connecting portion 13 as in the first embodiment, and the number of parts can be reduced. Furthermore, the movable side terminal 1 is supported by the first insulating support portion 5 and the support conductor 6 fixed to the flange 4 .

As described above, according to the second embodiment, the same effect as that of the first embodiment can be achieved, and the fixed-side terminal 2 can be supported from two directions with a smaller number of parts, and the first insulating support portion 5 and the first insulating support portion 5 and the The switch of the structure of the load of the 2nd insulating support part 15.

other implementations. In the above-mentioned Embodiments 1 and 2, although the example in which the fixed-side terminal 2 is supported by the insulating support part from the upper and lower parts is shown as a symmetrical position with respect to the movable shaft 11, the load at the time of switching can be designed to be equal. The two supporting members supporting the fixed-side terminal 2 are not limited to the upper part and the lower part. The position may be symmetrical at the angle offset from the vertical direction, or may be the position in the horizontal direction with respect to the movable shaft 11 .

In addition, in the above-mentioned Embodiments 1 and 2, although the example in which the fixed-side terminal 2 is supported by the insulating support portion from the upper portion and the lower portion is shown as a symmetrical position with respect to the movable shaft 11, the insulating support portion is not limited to two. What is necessary is just to arrange|position at the periphery of the movable shaft 11 at an equal distance from the movable shaft 11 and at an equal angle so that the load can be distributed.

When the switchgear of the first and second embodiments described above and other embodiments are used in a gas-insulated switchgear, in addition to the operating mechanism part, the movable-side terminal, the fixed-side terminal, and each insulating support part are accommodated in the sealed SF ₆ gas. A closed container made of dry air or the like is opened and closed by an operating mechanism part from the outside of the closed container.

The present disclosure describes various illustrative embodiments and examples, but the various features, aspects, and functions described in one or more of the embodiments are not limited to the application of the specific embodiment, but can be applied alone or in various combinations. in the embodiment. Accordingly, innumerable modifications not illustrated can be conceived within the technical scope disclosed in the specification of the present application. Furthermore, for example, the case where at least one component is modified, the case where at least one component is added or omitted, and the case where at least one component is extracted and combined with the components of other embodiments are also included.

1: Movable side terminal 2: Fixed side terminal 3: Movable electrode rod 4: Flange 5: The first insulating support part 6: Support conductor 7,15: Second insulating support 8: Movable contact 9: Axle rod 10: Spring 11: Movable shaft 12: Operating Mechanism Department 13: Links 14: static end 16: Bushing 100: switch L1: The distance between the movable shaft and the first insulating support part L2: The distance between the movable shaft and the second insulating support part

FIG. 1 is a cross-sectional view of a main part of a switch (open state) according to Embodiment 1. FIG. 2 is a partial enlarged view of a fixed side terminal of the switch in Embodiment 1. FIG. 3 is a cross-sectional view of a main part of the switch (closed circuit state) according to Embodiment 1. FIG. 4 is a cross-sectional view of a main part of the switch (in the open-circuit operation) according to the first embodiment. 5 is a cross-sectional view of a main part of a switch according to a comparative example of Embodiment 1. FIG. 6 is a cross-sectional view of a main part of a switch (open state) according to Embodiment 2. FIG.

1: Movable side terminal

2: Fixed side terminal

3: Movable electrode rod

4: Flange

5: The first insulating support part

6: Support conductor

7: Second insulating support part

8: Movable contact

9: Axle rod

10: Spring

11: Movable shaft

12: Operating Mechanism Department

13: Links

16: Bushing

100: switch

L1: The distance between the movable shaft and the first insulating support part

L2: The distance between the movable shaft and the second insulating support part

Claims (25)

A switch is provided with: fixed-side terminals having movable contacts; and The movable-side terminal is arranged opposite to the fixed-side terminal, and the movable-side terminal has a movable electrode rod that can be connected/separated to ensure electrical continuity with the fixed-side terminal; The movable side terminal is fixed on the side opposite to the side opposite to the fixed side terminal; The movable contact system has: a shaft rod, which moves in a coaxial manner with the movable electrode rod; and a spring, which pushes the shaft rod; When the fixed-side terminal and the movable-side terminal are closed, one end of the movable electrode rod is coupled to the movable contact; When the fixed-side terminal and the movable-side terminal are open-circuited, the movable electrode rod moves in the direction of the movable-side terminal in a state of being coupled to the movable contact, thereby accumulating the energy of the spring, and when the movable electrode is When the rod reaches a predetermined position, the spring will release energy to move the shaft rod toward the fixed side terminal, thereby separating the movable contact from the movable electrode rod; wherein, The fixed-side terminal is supported by a plurality of insulating support parts, which are arranged in symmetrical positions with respect to the axis of movement of the movable electrode rod, and one end thereof is fixed. The switch according to claim 1, wherein a plurality of the insulating support portions are arranged in parallel and equidistant with respect to the axis of movement of the movable electrode rod. The switch device according to claim 1 or 2, wherein the plurality of insulating support portions are made of resin, and are adjusted so that the amount of elastic deformation becomes equal. The switch according to claim 1 or 2, wherein one of the plurality of the insulating support portions supports both the fixed-side terminal and the movable-side terminal. The switch of claim 3, wherein one of the plurality of the insulating support portions supports both the fixed-side terminal and the movable-side terminal. The switch of claim 4, wherein, One of the plurality of the insulating support portions is provided at a position symmetrical with respect to the axis of movement of the movable electrode rod and the insulating support portion supporting both the fixed-side terminal and the movable-side terminal. The switch of claim 5, wherein, One of the plurality of the insulating support portions is provided at a position symmetrical with respect to the axis of movement of the movable electrode rod and the insulating support portion supporting both the fixed-side terminal and the movable-side terminal. The switch according to claim 1 or 2, comprising two of the insulating support portions, one of the insulating support portions supports the upper portion of the fixed-side terminal, and the other insulating support portion supports the lower portion of the fixed-side terminal . The switch according to claim 3 includes two insulating support portions, one of which supports the upper portion of the fixed-side terminal, and the other insulating support portion supports the lower portion of the fixed-side terminal. The switch according to claim 4 includes two insulating support portions, one of which supports the upper portion of the fixed-side terminal, and the other insulating support portion supports the lower portion of the fixed-side terminal. The switch according to claim 5 includes two insulating support portions, one of which supports the upper portion of the fixed-side terminal, and the other insulating support portion supports the lower portion of the fixed-side terminal. The switch according to claim 6 includes two insulating support portions, one of which supports the upper portion of the fixed-side terminal, and the other insulating support portion supports the lower portion of the fixed-side terminal. The switch according to claim 7 includes two insulating support portions, one of which supports the upper portion of the fixed-side terminal, and the other insulating support portion supports the lower portion of the fixed-side terminal. A gas insulated switchgear is provided with the switch according to claim 1 or 2. A gas insulated switchgear is provided with the switch according to claim 3. A gas insulated switchgear is provided with the switch according to claim 4. A gas-insulated switchgear is provided with the switch according to claim 5. A gas insulated switchgear is provided with the switch according to claim 6. A gas-insulated switchgear is provided with the switch according to claim 7. A gas insulated switchgear is provided with the switch according to claim 8. A gas insulated switchgear is provided with the switch according to claim 9. A gas insulated switchgear is provided with the switch according to claim 10. A gas insulated switchgear is provided with the switch according to claim 11. A gas insulated switchgear is provided with the switch according to claim 12. A gas-insulated switchgear is provided with the switch according to claim 13.

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