JP2022012663A - Ground switch - Google Patents

Abstract

To provide a ground switch that can prevent the occurrence of charging defects and shorten a charging time at the time of short-circuit charging.SOLUTION: A ground switch (10) includes a movable element (12) and a stator (14) that are provided detachably to energize in a contact state and cut off the energization in a separated state, and the movable element includes a blade member (12a) that moves in the direction of contact and separation with respect to the stator, and a plurality of conductive members (20) fixed to the blade member and capable of contacting the stator. The conductive member has a flexibility in which the base is connected to the blade member and can be deformed by contact with the stator.SELECTED DRAWING: Figure 1

Description

The present invention relates to a grounding switch having a function of inputting a short-circuit current.

Conventionally, in switchboards and the like, a grounding switch having a stator and a mover that can be connected and detached to ground the main circuit has been used (see Patent Document 1). In a grounded switch, a short-circuit input may be performed in which a circuit or the like to which a stator is connected operates a mover in a charged state to close the circuit. In Patent Document 1, the mover is formed by a pair of rotatable blades, while the stator is provided with a contactor that comes into contact with the stator while being sandwiched between the tips of the blades. A bolt is pierced in each blade, and a compression coil spring is loosely fitted in the outer position of the blade in this bolt to press the tip of the blade against the contact.

Japanese Unexamined Patent Publication No. 8-153445

Patent Document 1 has a problem that the mover and the stator repel each other due to a large current generated at the moment when the mover and the stator come into contact with each other when short-circuiting is performed. .. Therefore, in the grounding switch, there is a problem that the grounding failure occurs such that the grounding becomes impossible or the arc progresses.

Here, in order to solve this problem, it is conceivable to increase the urging force with the compression coil spring described above, but in this case, the mover is inserted during normal operation (when the bus is not charged). The operation load of is high. For this reason, there is a problem that the closing time at the time of short-circuit closing becomes long, and the time for the grounding state where the energization is unstable becomes long.

The present invention has been made in view of such a point, and an object of the present invention is to provide a grounding switch capable of preventing the occurrence of charging failure and shortening the charging time at the time of short-circuit charging.

The grounding switch of the present invention is a grounding switch provided with a stator and a mover which are provided so as to be connectable and detachable and which energize in a contact state and cut off the energization in a separated state. A movable element main body that moves in a direction of contacting and separating from a child, and a plurality of conductive members that are fixed to the movable element body and can come into contact with the stator are provided, and the base of the conductive member is the movable element main body. It is characterized in that it is connected to the stator and has flexibility that can be deformed by contact with the stator.

Further, the grounding switch of the present invention is a grounding switch provided with a stator and a mover which are provided so as to be detachable and energize in a contact state and cut off the energization in a separated state. A stator body and a plurality of conductive members fixed to the stator body and capable of contacting the mover are provided. The conductive member has a base connected to the stator body and is in contact with the mover. It is characterized by having flexibility that can be deformed.

According to the present invention, the flexible conductive member rubs against the stator and the mover and slides relatively when the short-circuit is turned on, so that they can be brought into contact with each other at multiple points. At this time, the plurality of conductive members come into contact with at least a part of the stator and the movable element to be slid without being separated from each other, and the energized state thereof can be stably secured. As a result, it is possible to prevent the occurrence of input failure due to the inability to touch the ground or the progress of the arc. Further, since the contact by the conductive member is performed at many points, it is easy to maintain the contact even if the contact pressure of the stator and the mover is reduced as compared with the conventional structure in which the contact is performed at one place. As a result, it is possible to shorten the charging time at the time of short-circuit charging, and it is possible to shift to a grounded state with high energization stability in a short time.

It is the schematic perspective view of the state in which the mover in the grounding switch which concerns on 1st Embodiment becomes a moving process. It is a schematic perspective view of the closed state of the grounding switch which concerns on 1st Embodiment. It is a partially enlarged view of FIG. It is a partial front sectional view of a mover and a stator in a state where a mover is in a moving process. It is a partial front sectional view of a mover and a stator in a closed state. It is the same schematic perspective view as FIG. 1 of the grounding switch which concerns on 2nd Embodiment.

[First Embodiment]
Hereinafter, the grounding switch according to the first embodiment will be described with reference to the accompanying drawings. FIG. 1 is a schematic perspective view of a state in which a mover in the grounding switch according to the first embodiment is in a moving process. FIG. 2 is a schematic perspective view of a closed state of the grounding switch according to the first embodiment. The grounding switch is not limited to the configuration shown in FIGS. 1 and 2. The grounding switch shown in FIGS. 1 and 2 is only an example and can be changed as appropriate.

As shown in FIGS. 1 and 2, the grounding switch 10 includes a mover 12 and a stator 14 provided so as to be connectable and detachable. Three sets of the mover 12 and the stator 14 are provided as three phases, and in the present embodiment, the three sets of the mover 12 and the stator 14 have substantially the same structure. The mover 12 and the stator 14 are energized (closed) in a contact state (see FIG. 2) and cut off (open) in a separated state. Here, in the present embodiment, the grounding switch 10 is an aerial switch that cuts off the current in the air (in the atmosphere), and is installed inside the switchboard or the like. Further, in the present embodiment, it is possible to short-circuit the ground from the open state to the closed state in the power application state at high voltage and high current.

The grounding switch 10 includes three insulators 16 provided at positions corresponding to the three sets of movers 12 and stators 14, and a base member 17 on which the three insulators 16 are erected. Further, the grounding switch 10 includes a bracket-shaped support member 18 provided on the upper end side of the three insulators 16 and a rotation support portion provided on the base member 17 to rotatably support the mover 12. It is equipped with 19. The support member 18 is formed to include a support wall 18a that supports the proximal end side of the stator 14.

The base member 17 is formed with a raised portion 17a so that the installation portion of the insulator 16 is raised. Further, three upright walls 19a forming the rotation support portion 19 are formed in a row on the upper surface side of the base member 17 which is the front side of the raised portion 17a. The rotation support portion 19 includes three rotating walls 19b rotatably connected to each upright wall 19a, and the base end side of the mover 12 is supported by the rotation wall 19b.

The mover 12 includes a pair of blade members 12a formed of a conductor such as copper, and the pair of blade members 12a constitutes a mover main body. The pair of blade members 12a are formed to be bent in a substantially crank shape so that the separation width on the distal end side is larger than the separation width on the proximal end side.

In the mover 12, the pair of blade members 12a are connected and integrated on the proximal end side by the connecting plate 12g. One of the pair of blade members 12a of the mover 12 is connected to the rotating wall 19b, and the mover 12 can move (rotate) in a direction in which the stator 14 is brought into contact with and separated from the stator 14. Specifically, when the mover 12 is rotated from a state in which it is laid down in the lateral direction, the tip side rises along the trajectory of the rotation, and as shown in FIG. 1, the mover 12 is moved from the tip side of the stator 14. Approach the tip side of 12. Then, the rotation further progresses, and after the tip end side of the mover 12 passes through the tip end side of the stator 14, the mover 12 stands upright in the vertical direction shown in FIG. 2 and moves to the base side of the stator 14. Contact. In this state, the pair of blade members 12a are arranged so as to sandwich the stator 14.

The three movers 12 are connected via the connecting shaft portion 21 on the proximal end side thereof, and rotate at the same timing and at the same rotation angle. Further, the connecting shaft portion 21 is formed of a conductor such as copper and is electrically conductive with the three movers 12. The connection shaft portion 21 is grounded via wiring or the like (not shown), and the mover 12 is set to the ground potential.

The stator 14 includes a flat plate-shaped connecting portion 14a and a sliding contact portion 14b formed in a row on the lower surface of the connecting portion 14a and with which the mover 12 comes into contact. The tip side of the connecting portion 14a protrudes from the sliding contact portion 14b, and a circuit, a bus, or the like (not shown) is connected at this protruding portion.

The sliding contact portion 14b has a shape extending in a linear direction in a direction along the rotation direction of the tip of the mover 12. Further, the sliding contact portion 14b has a shape in which the contact portion of the mover 12 swells in a substantially semi-cylindrical shape. The sliding contact portion 14b of the stator 14 is formed to include a first region 14A forming the distal end side and a second region 14B forming a predetermined region from the proximal end side other than the first region 14A. ..

FIG. 3 is a partially enlarged view of FIG. As shown in FIG. 3, the first region 14A is a region that first contacts when the mover 12 separated from the stator 14 moves (rotates) in the contact direction in which the stator 12 approaches and contacts the stator 14. Will be done. The second region 14B is adjacent to the first region 14A in the contact direction, and is a region that comes into contact with the first region 14A after contact with the mover 12 in the contact direction, and when the movement is completed. It is a region where the mover 12 comes into contact. The second region 14B is a region where the mover 12 and the stator 14 are energized in a normal closed state.

At the sliding contact portion 14b of the stator 14, both the first region 14A and the second region 14B are formed in a shape that swells in a substantially semi-cylindrical shape, but the sizes (formation regions) are different. Specifically, the second region 14B is formed smaller than the first region 14A in both the vertical direction and the lateral direction (the direction in which the stator 14 is sandwiched by the pair of blade members 12a).

The tip end side of the pair of blade members 12a in the mover 12 has a shape bulging in a direction approaching each other, and the bulging portion is a movable contact portion 12b in contact with the stator 14. The movable contact portion 12b is formed at the center position in the rotation direction of the tip of the mover 12 on the tip end side of the pair of blade members 12a.

The mover 12 includes a pressure spring (elastic member) 12c configured by a compression coil spring. The contact pressure spring 12c applies an elastic force in a direction in which the pair of blade members 12a are close to each other, and brakes against the displacement of the pair of blade members 12a in the direction in which they are separated from each other.

Specifically, the pressure contact spring 12c is provided on the outer surface side of one of the pair of blade members 12a, and is inserted into a bolt 12d penetrating the pair of blade members 12a. A nut 12e (see FIG. 4, not shown in FIG. 3) is screwed to the tip side of the bolt 12d, and a pressure spring 12c is compressed between the head of the bolt 12d and the outer surface of the blade member 12a. It is arranged in a state. Further, a connecting cylinder 12f is interposed between the inner surfaces of the pair of blade members 12a on the distal end side, and the bolt 12d is inserted into the connecting cylinder 12f. The positional relationship between the head of the bolt 12d and the nut 12e may be reversed.

The mover 12 includes a plurality of conductive members 20 at positions in the vicinity of the movable contact portion 12b. Specifically, the conductive member 20 is provided on the inner surface side of the tip of the pair of blade members 12a at positions adjacent to each other on both sides of the movable contact portion 12b in the rotation direction of the mover 12.

The conductive member 20 is made of a linear body such as a copper wire, and has flexibility that can be deformed by contact with the stator 14. The base of the conductive member 20 is fixed to the blade member 12a and electrically connected. Therefore, when the conductive member 20 comes into contact with the sliding contact portion 14b of the stator 14, a current flows from the sliding contact portion 14b to the blade member 12a via the conductive member 20.

A plurality of conductive members 20 are provided in a state of being densely packed at narrow intervals, and are provided so as to have a brush shape. The conductive member 20 is formed to be longer than the protrusion amount of the movable contact portion 12b in a state where the pair of blade members 12a are linearly extended in the direction of sandwiching the stator 14.

Here, the positional relationship between the movable contact portion 12b, the conductive member 20, and the sliding contact portion 14b of the stator 14 will be described. FIG. 4 is a partial front sectional view of the mover and the stator in a state where the mover is in the moving process. As shown in FIG. 4, in a state where the mover 12 faces the first region 14A of the sliding contact portion 14b, the conductive member 20 in the central portion in the vertical direction in FIG. 4 abuts on the sliding contact portion 14b, and the sliding contact portion 14b It is pushed by and deforms so that it falls or bends. Therefore, the conductive member 20 comes into contact with the outer surface of the first region 14A, and the contact state between them is maintained so that the conductive member 20 is electrically conductive. In this state, the movable contact portion 12b is separated from the first region 14A and becomes non-contact, and is not energized between them.

FIG. 5 is a partial front sectional view of a mover and a stator in a closed circuit state. When the movable element 12 is further rotated and the movable element 12 faces the second region 14B of the sliding contact portion 14b, the movable contact portion 12b comes into contact with the second region 14B as shown in FIG. At this time, the conductive member 20 is further pushed by the sliding contact portion 14b to be deformed, and the conductive member 20 is attached to the outer surface of the second region 14B. Therefore, the contact state of both the movable contact portion 12b and the conductive member 20 is maintained with respect to the sliding contact portion 14b, and the state is electrically conductive.

As described above, the movable contact portion 12b is not in contact with the first region 14A but is in contact with the second region 14B, whereas the conductive member 20 is provided so as to be able to contact both the first region 14A and the second region 14B. ing.

Subsequently, the short-circuit closing operation of the grounding switch 10 will be described. When the switchboard on which the grounding switch 10 is installed is maintained in the open state, the mover 12 is moved in the contact direction in contact with the stator 14 via a drive mechanism (not shown) or the like. At this time, from the state where the mover 12 is separated from the stator 14 and the energization is cut off, as shown in FIG. 1, the tip end side of the mover 12 is the first sliding contact portion 14b of the stator 14. First contact with region 14A. Immediately before such contact, a reverse current is generated between the first region 14A of the sliding contact portion 14b and the mover 12, and the generation of this reverse current generates a repulsive force in the direction in which the mover 12 separates from the stator 14.

In the present embodiment, in the initial stage of contact between the first region 14A of the sliding contact portion 14b and the mover 12, a plurality of flexible conductive members 20 are rubbed and slid against the first region 14A. They can be brought into contact at multiple points. Even if a part of the plurality of conductive members 20 deviates from the first region 14A due to such contact at multiple points, the other conductive members 20 maintain the contact state with the conductive member 20 and the sliding contact portion 14b. It is possible to secure the energization with. As a result, it is possible to prevent the grounding from being impossible and the occurrence of an arc between the stator 14 and the mover 12, and it is possible to avoid the occurrence of input failure.

Further, since the conductive member 20 is a linear body, the diameter of the portion in contact with the stator 14 can be sufficiently reduced, and the electromagnetic repulsive force acting on the conductive member 20 due to the generation of a reverse current can be reduced. can. Therefore, this also contributes to maintaining the contact between the conductive member 20 and the first region 14A of the sliding contact portion 14b, and it is possible to better avoid the occurrence of charging defects.

Here, in order to prevent arcing between the stator 14 and the mover 12, as a conventional structure, the elastic force of the pressure contact spring 12c is strengthened without using the conductive member 20 of the present embodiment, and the mover and the mover are fixed. A configuration was adopted to increase the contact pressure with the child. However, in such a conventional structure, the friction when the mover slides with the stator becomes large, so it is necessary to increase the throwing input of the mover in order to shorten the charging time. Therefore, there is a problem that the throwing mechanism becomes large and costly, and the mover bounces and ignites due to the impact when the mover first contacts the stator.

In this respect, in the present embodiment, the movable element 12 is provided with a plurality of conductive members 20 and comes into contact with the stator 14 at many points. As a result, even if the contact pressure of the stator 14 and the mover 12 is reduced without increasing the elastic force of the pressure contact spring 12c as compared with the conventional structure, it is easy to maintain the contact between them and prevent arcing. Can be done. As a result, it is possible to shorten the charging time at the time of short-circuit charging while reducing the size and cost of the charging mechanism and the like, and it is possible to shift to a grounded state with high energization stability in a short time.

Further, during the grounding energization shown in FIG. 2, the second region 14B of the sliding contact portion 14b and the movable contact portion 12b of the mover 12 are in contact with each other to energize, so that the heat capacity in them can be increased and a large current at the time of a short circuit can be obtained. Welding due to contact melting can be avoided even if energization occurs for several seconds. Further, also in this case, the current can be diverted from the second region 14B to the plurality of conductive members 20 to reduce the current between the second region 14B and the movable contact portion 12b which are the main contacts, and the heat generation can be suppressed.

Further, during the grounding energization shown in FIG. 2, an electromagnetic attraction force acts in the contraction direction so that the plurality of conductive members 20 cover the second region 14B of the sliding contact portion 14b, and the electromagnetic attraction is greater than the electromagnetic repulsion force due to the concentrated current. It can be expected that forces will be generated, and the adhesion between them can be improved.

Further, since the plurality of conductive members 20 are brush-shaped, the contact region of the sliding contact portion 14b with the first region 14A and the second region 14B can be secured over a wide range.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same reference numerals may be used for the same or equivalent components as those in the first embodiment, and the description may be omitted or simplified.

FIG. 6 is a schematic perspective view similar to FIG. 1 of the grounding switch according to the second embodiment. As shown in FIG. 6, in the second embodiment, a plurality of conductive members 30 are provided on the sliding contact portion 14b of the stator 14. Here, the sliding contact portion 14b is used as the stator main body.

Like the conductive member 20 of the first embodiment, the conductive member 30 is made of a linear body such as a copper wire and has flexibility that can be deformed by contact with the mover 12. The base of the conductive member 20 is fixed to the sliding contact portion 14b and electrically connected. When the conductive member 30 comes into contact with the tip end side of the blade member 12a in the mover 12, a current flows between them.

The conductive member 30 is continuously formed over the first region 14A and the second region 14B of the sliding contact portion 14b. The conductive member 30 is provided so as to have a brush shape, and is formed so that the pair of blade members 12a project linearly in parallel with the direction in which the stator 14 is sandwiched.

The sliding contact portion 14b is formed to have different sizes in the first region 14A and the second region 14B as in the first embodiment. Therefore, although the tip positions of the conductive members 30 are located within substantially the same vertical plane, the lengths of the conductive members 30 differ depending on the shape of the sliding contact portion 14b that swells in a substantially semi-cylindrical shape.

In the second embodiment, the conductive member 30 of the stator 14 and the mover 12 can be brought into contact with each other at multiple points at the initial stage of short-circuiting. As a result, it is possible to obtain the same operations and effects as those of the first embodiment, such as preventing the firing between the stator 14 and the mover 12 and avoiding the occurrence of input defects.

The present invention is not limited to each of the above embodiments, and can be modified in various ways. In the above embodiment, the size, shape, orientation, etc. shown in the attached drawings are not limited to this, and can be appropriately changed within the range in which the effect of the present invention is exhibited. In addition, it can be appropriately modified and implemented as long as it does not deviate from the scope of the object of the present invention.

Various changes can be made to the structure and orientation of the mover 12 and the stator 14 as long as they have the same functions as described above. For example, the movable element 12 can be operated in a linear direction so as to be detachable from the stator 14, depending on the installation space of the grounding switch 10 and the energization capacity.

Further, although the case where the grounding switch 10 is used as an aerial switch has been described, the switch shall be a switch that opens and closes the mover 12 and the stator 14 in an insulating gas (arc-extinguishing gas) or vacuum environment. Does not interfere with.

Further, the conductive members 20 and 30 may be linear bodies or may be flexible pieces that can be elastically deformed by the movement of the mover 12. In this case, by forming the tip shape of the flake into a tapered shape, it is advantageous in that the contact diameters of the conductive members 20 and 30 can be sufficiently reduced and the electromagnetic repulsive force can be suppressed.

10 Grounding switch 12 Movable element 12a Blade member (Movable element body)
12b Movable contact part 14 Stator 14A 1st area 14B 2nd area 14b Sliding part (stator body)
20 Conductive member 30 Conductive member

Claims (6)

It is a grounding switch equipped with a stator and a mover that are provided so as to be connectable and detachable, and energize in a contact state and shut off the energization in a separated state.
The mover includes a mover body that moves in a direction of contacting and separating from the stator, and a plurality of conductive members that are fixed to the mover body and can come into contact with the stator.
The conductive member is a grounding switch having a base connected to the movable element main body and having flexibility that can be deformed by contact with the stator. The stator includes a first region in which the separated mover moves in the contact direction and first contacts the stator, and a second region in which the mover moves in the contact direction and comes into contact with the stator.
The mover is characterized by having a movable contact portion that is non-contact with the first region while facing the first region and is in contact with the second region while facing the second region. The grounding switch according to claim 1. The grounding switch according to claim 2, wherein the conductive member is provided so as to be in contact with both the first region and the second region. It is a grounding switch equipped with a stator and a mover that are provided so as to be connectable and detachable, and energize in a contact state and shut off the energization in a separated state.
The stator includes a stator body and a plurality of conductive members fixed to the stator body and capable of contacting the mover.
The conductive member is a grounding switch having a base connected to the stator body and having flexibility that can be deformed by contact with the mover. The grounding switch according to any one of claims 1 to 4, wherein the conductive member is formed of a linear body or a flaky body having a tapered shape. The grounding switch according to any one of claims 1 to 5, wherein the conductive member is provided in a brush shape.

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