WO2012169346A1

WO2012169346A1 - Switch and switch gear

Info

Publication number: WO2012169346A1
Application number: PCT/JP2012/063109
Authority: WO
Inventors: 美稀山崎; 土屋　賢治; 歩森田; 小林　将人
Original assignee: 株式会社日立製作所
Priority date: 2011-06-07
Filing date: 2012-05-23
Publication date: 2012-12-13
Also published as: JP2012252968A; JP5544329B2

Abstract

The purpose of the present invention is to provide a switch and the like that guides an operating rod over a long distance and permits inclination when motionless. In order to solve the problem described above, the switch in the present invention is provided, for example, with: a fixed electrode (4); a movable electrode (3) that faces the fixed electrode (4) and contacts and separates therefrom; an operating instrument (14) that generates an operating force that operates the movable electrode (3); an operating rod (5) that transfers the operating force from the operating instrument (14) to the movable electrode (3); and a guide (6e) that is in contact with the operating rod (5) and guides the operating rod (5) such that an operating rod (5) drive operation is along the direction of a drive shaft. The switch is characterized by the guide (6e) guiding the operating rod (5) over a distance longer than the length in the axial direction of the guide (6e) itself, which is in contact with the operating rod (5), at the same time.

Description

Switch and switchgear

The present invention relates to a switch and a switch gear, and more particularly to a guide mechanism for an operating rod of a movable electrode in the switch.

A switch having a fixed electrode and a movable electrode is provided with a guide for guiding the driving direction so that the movable electrode can properly contact the fixed electrode.

In a switch with one-point cutting or more that repeatedly turns on and off, such as a circuit breaker, there is a possibility that a convex is formed on the electrode surface due to local welding to a part of the electrode at the time of breaking, and the electrode surface is not horizontal after breaking There is. Therefore, at the time of the next injection after the interruption, the movable electrode connected to the operation rod is aligned with the convexity of the electrode surface in order to ensure a current-carrying area (contact area) even if the convexity remains on the electrode surface. A guide needs to be formed to tilt.

In addition, the operating rod is suspended from the operating device at the breaking position, etc., away from the fixed contact. At this time, there is no problem as long as the force applied to the operating rod is only in the driving direction, but in reality, a force other than the driving direction due to the positional deviation or dimensional error of the operating device link mechanism is applied to the operating rod. Is held tilted. In this case, since the guide is directed in the driving direction, the operating rod is caught by the inner peripheral end portion of the guide, and stress is concentrated at the hooked portion. In order to prevent stress concentration on the guide due to this catch, it is necessary for the guide to allow the tilt of the operating rod and absorb these forces.

Therefore, it is desirable that the guide allows the tilt of the operation rod when the movable electrode is stationary.

On the other hand, if an operation such as closing and closing is performed while the operating rod is tilted, a local contact pressure with the operating rod is applied to the inner peripheral end of the guide, which may cause the guide to break. In addition, a large operating force is required to overcome the local contact pressure as the operating force to the operating rod, leading to an increase in the size of the operating device.

Therefore, it is desirable that the guide guides the operating rod straight in the driving direction when the movable electrode operates.

Here, as a conventional guide mechanism, there is one described in Patent Document 1, for example. In Patent Document 1, means for allowing misalignment is provided between the guide portion and the operation rod. According to Patent Document 1, it is possible to generate an equal contact force with respect to the two contact points constituting the two-point cut by allowing the operation rod to be misaligned.

JP 2009-32611 A

According to the contents described in Patent Document 1 described above, the tilt of the operating rod is allowed, but the distance for guiding the operating rod is short. Therefore, when the stroke length for moving the movable electrode becomes longer, it is necessary to lengthen the guide in the axial direction in order to increase the distance for guiding the operation rod. On the other hand, if the guide is lengthened in the axial direction, an angle for tilting the operation rod cannot be obtained, and it is difficult to tilt this time.

The present invention has been made in view of the above points, and an object of the present invention is to provide a switch or the like that guides the operating rod over a long distance and allows tilting at rest.

In order to solve the above problems, a switch according to the present invention includes a fixed electrode, a movable electrode facing and separating from the fixed electrode, an operating device for generating an operating force for operating the movable electrode, An operating rod that transmits the operating force from the operating device to the movable electrode, and a guide that contacts the operating rod and guides the operating rod so that the driving operation of the operating rod is along the drive axis direction. A switch, wherein the guide guides the operating rod over a distance longer than the axial length of the guide itself simultaneously contacting the operating rod.

According to the present invention, it is possible to provide a switch or the like that guides the operating rod over a long distance and permits tilting when stationary.

Issues, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is a side view of the switch in Example 1. It is a figure explaining the guide mechanism in Example 1, and shows an injection state. The side view and side sectional view of a fixed guide in Example 1 are shown. The side view and sectional side view of the movable guide 6e in Example 1 are shown. It is a figure which shows the movable conductor 5 which attached the stopper in Example 1. FIG. It is the figure which looked at the movable conductor 5 in Example 1 from the axial direction. It is a figure explaining the procedure which assembles the guide mechanism in Example 1. FIG. It is a figure which shows the transient state at the time of the drive of the movable conductor 5 in Example 1. FIG. It is a figure explaining the guide mechanism in Example 1, and shows the interruption | blocking state. It is a figure explaining the inclination at the time of injection in Example 1. FIG. It is a figure explaining the inclination at the time of interruption | blocking in Example 1. FIG. It is a figure explaining the guide mechanism in Example 2. FIG. It is a side view of the switchgear in Example 3.

Hereinafter, embodiments suitable for carrying out the present invention will be described with reference to the drawings. The following are examples, and are not intended to limit the content of the present invention to the following embodiments. The present invention is defined by the description of the scope of claims, and can be modified into various modes in order to satisfy such contents.

Example 1 will be described with reference to FIGS.

As shown in FIG. 1, the switch according to the present embodiment is roughly constituted by a vacuum vessel 1, an operation mechanism 14, and a link mechanism 16 that couples both.

The vacuum vessel 1 is composed of an insulating cylinder 2 and an end plate 17, and a guide holding portion 6 d is fixed to an opening at the top of the end plate 17 via a fixing bracket 7. Inside the vacuum vessel 1, a fixed electrode 4 and a movable electrode 3 facing the fixed electrode 4 are arranged, and the movable electrode 3 is a movable conductor (also operating rod) 5 reinforced with a metal that is not annealed at a high temperature such as stainless steel. The fixed electrode 4 is fixed to the tip of the fixed conductor 18, respectively. The movable conductor 5 is led out of the vacuum vessel 1 and is connected to the link mechanism 16 by the operation pin 8. The switch described in the present embodiment is a two-position type switch for closing and closing (or disconnection, grounding, etc.), and switches each position by driving a movable electrode.

The link mechanism 16 includes a connection portion 19 connected to the movable conductor 5 by an operation pin 8 and an insulating operation rod that is connected to the connection portion 19 and insulates the high voltage on the main circuit side from being applied to the operation device side. 9, a lever connecting portion 10 and a connecting portion 20 that connect the insulating operating rod 9 and the operating lever 11, a shaft 12 that is disposed in the middle of the operating lever 11 and serves as a rotation axis of the operating lever 11, and the operating lever 11 The connecting rod 13 is connected to the other end of the lever connecting portion 10, and the connecting portion 21 connects the connecting rod 13 and the operation mechanism 14.

The operation mechanism 14 generates an operation force for driving the movable electrode 3 by an electromagnet or the like.

The movable electrode 3 is stopped at a closing (closed) position for energization by the clockwise or counterclockwise rotation of the operating lever 11 by the operating mechanism 14, and the current is cut off at a position closer to the operating device than the closed position. Stopped at the disconnection (open) position for stopping or at the position closer to the controller side than this open position, and stopped at the disconnection position or grounding position to ensure the safety of the inspection operator against surge voltage such as lightning Is done.

The structure of the guide portion will be described with reference to FIGS. As shown in FIG. 2, the guide portion includes the guide pressing portion 6d, which is the above-described fixing member, the movable guide 6e, and

stoppers

5a and 5b that are fixed to the movable conductor 5 at both ends in the axial direction of the movable guide 6e. It consists of. The movable conductor 5 is guided by the movable guide 6e when the movable contact is moved, so that the outer peripheral length 5-wi of the movable conductor 5 is approximately the same as the minimum inner peripheral length 6-wi of the movable guide 6e, and It is provided to be slightly smaller. The movable guide 6e is in sliding contact with the inner diameter side of the guide pressing portion 6d when passing through the inside of the guide pressing portion 6d. In order to realize such a mechanism, the inner diameter of the guide pressing portion 6d is formed to be smaller than the maximum value of the outer diameter of the movable guide 6e and larger than the minimum value.

FIG. 3 shows the guide pressing portion 6d. The inner diameter of the guide pressing portion 6d is a uniform length in the axial direction, and a wide portion 6f having a wide outer diameter is formed so that the fixing bracket 7 is not removed. The fixing bracket 7 is disposed between the wide portion 6 f and the end plate 17, and fixes the guide pressing portion 6 d to the vacuum vessel 1.

FIG. 4 shows the movable guide 6e. The movable guide 6e is provided with a plurality of cuts equally in the circumferential direction from both ends in the axial direction of the movable guide 6e toward the center in the axial direction, and a piece that is divided on the end side is opened (like a petal). It has become. Here, if there is only one notch, a plurality of notches are provided when the 180 ° back side on the side where the notch is provided cannot be properly opened and is not pressed by the guide pressing portion 6d. This is because a space for allowing inclination cannot be provided. Evenly, when the notch is evenly provided, the force is applied from any direction (that is, tilted in any direction). This is because it can be inserted and removed.

The notch is not provided in the central portion in the axial direction, and the movable guide 6e is not completely separated but is composed of one member. Hereinafter, the portion having the cut on the axial end side is referred to as the movable guide

first regions

6a and 6b, and the portion having no cut in the central portion in the axial direction is referred to as the second region 6c. The movable guide 6e is made of an elastic member (for example, a stainless steel material for a spring), and the divided pieces function like a leaf spring, and are open in a natural state where no force is applied. That is, the outer peripheral lengths of the movable guide

first regions

6a and 6b are formed so as to change to different peripheral lengths depending on whether or not they are in sliding contact with the guide pressing portion 6d.

Then, as shown in FIG. 2, the outer peripheral lengths 6a-wo and 6b-wo are formed so as to gradually spread from the movable guide second region 6c to the movable guide both ends

first regions

6a and 6b. In the drawings, for the convenience of illustration, the outer peripheral length is represented by the outer diameter of the movable guide. Further, the diameter may be compared instead of the circumference. When the guide is held inside the guide pressing portion 6d, the movable guide 6e is closed, and the inner peripheral side thereof is in contact with the movable conductor 5 to perform a guide function.

The thickness of the movable guide 6e is not constant. As a result, the force pressed by the guide pressing portion 6d is weak (except for the portion where the thickness is maximum) (becomes supported at a point when viewed from the axial direction), and the movable guide 6e is positioned inside the guide pressing portion 6d. In this case, the inclination described later is easily made.

Further, the thickness of the movable guide 6e is maximized from the axial center of the movable guide 6e in a state of being held by the guide holding portion 6d so that the guide holding portion 6d can slide (smoothly) without colliding with the movable guide 6e. The inclination of the outer diameter in the range up to the position becomes 0 ° in any part when the axis in the driving direction of the movable conductor 5 (the movable electrode 3 side when turned on, the actuator side when cut off) is 0 °. The angle is less than 90 °.

FIG. 5 shows the state of the

stoppers

5a and 5b which are located at both ends of the movable guide 6e and are fixed to the movable conductor 5. In this embodiment, although the movable guide 6e is not fixed to the movable conductor 5, one or more stoppers are provided, and the outer peripheral lengths 5b-wo (5a-wo) of the

stoppers

5a and 5b at both ends as shown in FIG. Is larger than the maximum value of the outer peripheral length of both ends of the movable guide in the axial direction, the movable guide 6e is supported by being sandwiched between the

stoppers

5a and 5b at both ends without falling off. Thereby, the movable guide 6e can be driven in the axial direction together with the movable conductor 5 while being sandwiched between the

stoppers

5a and 5b in accordance with the drive of the movable conductor 5.

FIG. 6 shows how the

stoppers

5a and 5b are fixed (FIG. 6 (b)) and when they are not fixed (FIG. 6 (a)) as viewed from both ends in the axial direction. Yes. As can be seen from the figure when the

stoppers

5a and 5b are not fixed (FIG. 6A), when the first region 6a of the movable guide 6e is located inside the guide pressing portion 6d, the first region of the movable guide 6e. The plurality of cuts in 6a are in a closed state. On the other hand, the second region 6b of the movable guide 6e not located inside the guide pressing portion 6d is in a state opened from a plurality of cuts. Thereby, the case where the first region 6a or the second region 6b of the movable guide 6e is located inside the guide pressing portion 6d and the case where the first region 6a and the second region 6b perform the guide function are not satisfied. It turns out that it switches in case.

Fig. 7 shows the procedure for assembling the guide section. First, the movable guide 6e, which is composed of an elastic member or the like and has a piece that is equally divided into a plurality in the circumferential direction, is brought into sliding contact with the inner periphery of the guide pressing portion 6d. Thereafter, the guide pressing portion 6d in which the movable guide 6e is slidably contacted from the direction in which the stopper is not provided is inserted into the movable conductor 5 provided with the stopper 5b (or 5a) at one place on the outer periphery of the movable conductor 5. . Finally, a stopper 5 a is provided on the outer periphery of the movable conductor 5 on the side where the guide pressing portion 6 d is inserted, and the guide pressing portion 6 d is fixed to the end plate 17 of the vacuum vessel 1 with a fixing bracket 7 such as a bolt. The

stoppers

5a and 5b are formed in a ring shape from a material such as austenitic stainless steel, and a screw structure (not shown) is formed on the inner periphery of the ring. The screw structure and a screw structure (not shown) formed on the outer periphery of the movable conductor are fixed to the outer periphery of the movable conductor.

The switch configured as described above will be described with reference to FIG. 2 and FIGS. First, a mechanism for guiding the movable conductor 5 during operation will be described.

FIG. 2 shows the state of the movable conductor 5 and the guide portion when in the closing state. From this state, a transitional state is passed as shown in FIG. 8, and finally a transition is made to a cutoff state as shown in FIG. To do. In the present embodiment, the case of two positions of closing dredging interruption (or disconnection, grounding, etc.) has been described, and the guide distance (L, l ₁ , l ₂ in FIG. 2) of the movable guide 6e is the movable electrode 3 side ( l ₂ ) and the operation mechanism 14 side (l ₁ ) may be the same length, but a three-position type switch (for example, “turning on, breaking, disconnecting” of the disconnecting disconnection part) )), The guide distance (l ₂ ) on the movable electrode side is longer than the guide distance (l ₁ ) on the operating device side, and the tilt is also applied when the actuator is stopped in a shut-off state. It is necessary to make the movable electrode 3 side (l ₂ ) of the movable guide 6e longer than the operation mechanism 14 side (l ₁ ).

In the inserted state, only the portion on the operating unit side of the movable guide 6e is located in the guide pressing portion 6d. Therefore, movable guide 6e, the inner peripheral that is in contact with the movable conductor 5 (at the time of stop) at the same time, is only part of the operating-side and its length is l _1.

From this state, when going to the shut-off state, it goes through a transient state as shown in FIG. This transient state is described for the sake of explanation, and does not indicate that the vehicle actually stops. In this transient state, part of the operating device side and the movable electrode 3 side is also located in the guide pressing portion 6d. Therefore, in the movable guide 6e, the inner periphery of the movable guide 6e is in contact with the movable conductor 5 as well as the portion on the movable electrode 3 side in addition to the above-described portion on the operating device side. That is, at this time, it is necessary to add up the total axial length L of the movable guide 6e (more precisely, 1 / cos θ, etc., but in this specification, the change in length when opened and closed is complicated. In order to prevent this, the description is omitted.) Is in contact with the movable conductor 5.

The transition to the shut-off state is finally made via the transient state, and at this time, only the portion on the movable electrode 3 side of the movable guide 6e is located in the guide pressing portion 6d. It is. Therefore, movable guide 6e, the inner peripheral that is in contact with the movable conductor 5 (at the time of stop) at the same time, is only part of the movable electrode side and its length is l _2.

Of the movable guide 6e, the portion where the inner peripheral side is in contact with the movable conductor 5 serves as a guide function for guiding the driving direction of the movable conductor 5, so that the distance that the movable guide 6e can guide after all is the movable guide 6e. Thus, the inner circumference is not L ₁ or l ₂ which is in contact with the movable conductor 5 at the same time, but L of the entire length. As described above, the movable guide 6e is changed in the contact portion, so that the movable conductor 6e has a movable conductor 6e whose inner periphery is longer than l ₁ and l ₂ that are in contact with the movable conductor 5 at the same time. 5 can be guided.

Next, it will be described with reference to FIGS. 10 and 11 that the movable guide 6e is allowed to tilt when it is stationary.

(B) of FIG. 10 shows the inclination in the input state. In the throwing state, the movable guide 6e has its inner circumference simultaneously in contact with the movable conductor 5 only at the portion on the operating device side, and since the movable electrode 3 side is open, the movable conductor 5 is inclined. An angle can be secured (it is allowed to incline within the range indicated by S in FIG. 10B). Therefore, the convexity remains on the electrode surface due to local welding to a part of the electrode, so that the electrode is disconnected after being cut off. Even when the horizontal state is lost, the movable conductor 5 can be tilted, so that a contact area can be secured.

Further, in this embodiment, the movable guide 6e is formed of an elastic member, and the entire surface of the movable guide 6e that contacts the movable conductor 5 can be inclined, the catch itself can be prevented, and the stress concentration can be further reduced. Thereby, the gap between the movable conductor 5 on the operating device side and the guide pressing portion 6d can be minimized, and it is possible to suppress the generation of local contact pressure due to catching at the next disconnection.

(B) of FIG. 11 shows the inclination in the shut-off state. In the cut-off state, the movable guide 6e has its inner periphery simultaneously in contact with the movable conductor 5 only at the movable electrode 3 side, and since the operating device side is open, the movable conductor 5 is inclined. An angle can be secured (inclination within a range indicated by S in FIG. 11B is allowed). Therefore, the movable conductor 5 is suspended from the operating device, and the movable conductor 5 is allowed to be held in an inclined state by applying a force to the movable conductor 5 other than the driving direction due to the positional deviation or dimensional error of the link mechanism. Thus, stress concentration can be prevented.

Further, in this embodiment, the movable guide 6e is formed of an elastic member, and the entire surface of the movable guide 6e that contacts the movable conductor 5 can be inclined, the catch itself can be prevented, and the stress concentration can be further reduced. As a result, the gap between the movable conductor 5 on the operating device side and the guide pressing portion 6d can be minimized, and it is possible to suppress the generation of local contact pressure due to catching at the next charging.

In the present embodiment, the guide pressing portion 6d is fixed (with respect to the vacuum vessel 1), but is not necessarily fixed for achieving the effects of the invention. The movable guide 6e may be allowed to move relatively in the axial direction.

Example 2 will be described with reference to FIG. In addition, about the location which overlaps with Example 1, the description is abbreviate | omitted. In this embodiment, instead of using the

stoppers

5 a and 5 b, the second region 26 c at the center of the movable guide 6 e is lengthened and the second region 26 c is fixed to the movable conductor 5. For example, the second region 26c of the movable guide is fixed to the movable conductor 5 by, for example, a convex screw structure (not shown) formed at the center of the inner periphery of the second region 26c of the movable guide and a screw formed at the outer periphery of the movable conductor. Depending on the structure (not shown).

Securing the second region without a cut does not hinder the realization of the mechanism of the first embodiment, and the same effect can be obtained. Thereby, a mechanism for mounting the movable guide 6e on the movable conductor 5 itself to be guided is realized.

In addition, according to this mechanism, there is no need for a stopper, and the number of parts can be reduced.

In each of the above-described embodiments, the movable electrode 3 and the fixed electrode 4 are disposed in the vacuum vessel 1 having a vacuum inside, and the switch is a vacuum-insulated switch. It is not limited and it is possible to use any insulated switch. In particular, when an air-insulated switch is used, the stroke distance becomes longer and the guiding distance becomes longer, so it is beneficial to use the above-described guide.

Example 3 will be described with reference to FIG. In the present embodiment, an example in which the switch described in the first embodiment is applied to a switch gear will be described.

The fixed conductor 18 is connected to a cable 15 that supplies power to the load side. The movable conductor 5 has a flexible conductor 30 disposed in the depth direction of the drawing, and the flexible conductor 30 is connected to the busbar side. The vacuum container 1 of the switch is housed in a resin container (solid insulator) whose surface is at ground potential. In other words, a solid insulator (resin container) whose surface is at ground potential is disposed around the fixed electrode and the movable electrode. These are housed in the housing 31.

As described in this embodiment, it is possible to apply the above-described switch to a switch gear, and it is possible to apply to various switch gears without being limited to the switch gear described here. . In addition, although the present Example demonstrated using the switch demonstrated in Example 1 as an example, of course, applying the various switches which can implement | achieve this invention including the switch demonstrated in Example 2 is applied. Is possible.

The present invention is not limited to the first to third embodiments described above, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

1 vacuum vessel, 2 insulating cylinder, 3 movable electrode, 4 fixed electrode, 5 movable conductor (operating rod), 6a, 6b first area, 6c, 26c second area, 6d guide holding part, 6e movable guide, 6f wide part , 7 Fixing bracket, 8 Operation pin, 9 Insulating operation rod, 10 Lever connection part, 11 Operation lever, 12 Shaft, 13 Connection rod, 14 Operation mechanism, 15 Cable, 16 Link mechanism, 17 End plate, 18 Fixed conductor, 19 , 20, 21 connection part, 30 flexible conductor, 31 housing

Claims

A fixed electrode;
A movable electrode facing and separating from the fixed electrode;
An operating device for generating an operating force for operating the movable electrode;
An operating rod for transmitting the operating force from the operating device to the movable electrode;
A switch that includes a guide that contacts the operation rod and guides the operation rod so that a drive operation of the operation rod is along a drive axis direction;
A switch that guides the operating rod over a distance that is longer than the axial length of the guide itself that contacts the operating rod at the same time.
The switch according to claim 1,
The guide is a guide in which a contact portion with respect to the operation rod changes with a drive operation of the operation rod,
The switch is configured to guide the operating rod over a distance longer than an axial length of the guide itself, which is in contact with the operating rod at the same time, by changing a contact portion with the operating rod. .
The switch according to claim 1 or 2,
The guide has a guide distance on the movable electrode side that is longer than a guide distance on the operating device side,
The switch is characterized in that the movable electrode moves to three positions with respect to the fixed electrode.
The switch according to any one of claims 1 to 3,
Furthermore, the guide passes through the inside, and when the guide passes through the inside, a guide pressing member that comes into sliding contact with the guide is provided.
The inner diameter of the guide pressing member is formed smaller than the maximum value of the outer diameter of the guide and larger than the minimum value,
The switch, wherein the guide moves relative to the guide pressing member in the axial direction.
The switch according to claim 4,
A switch according to claim 1, wherein the thickness of the guide is not constant.
The switch according to claim 5,
When the guide pressing member and the guide are in sliding contact,
The inclination of the outer diameter of the guide in the range from the center in the axial direction of the guide to the position where the outer diameter of the guide is the maximum inside the guide pressing member is:
In any part, when the axis in the drive direction of the operating rod is 0 °, the switch is 0 ° or more and less than 90 °.
The switch according to any one of claims 1 to 6,
The switch is characterized in that the guide is made of an elastic member.
The switch according to any one of claims 1 to 7,
The switch is characterized in that the guide has a plurality of cuts from the axial end toward the axial center.
The switch according to claim 8, wherein the plurality of cuts are evenly arranged in a circumferential direction of the guide.
The switch according to any one of claims 1 to 9,
A switch that is provided with stoppers that prevent the guide from coming off the operating rod at both ends in the axial direction of the guide in the operating rod.
The switch according to any one of claims 1 to 9,
The switch according to claim 1, wherein an axially central portion of the guide is fixed to the operation rod.
The switch according to any one of claims 1 to 11,
The switch is an air insulated switch.
The switch according to any one of claims 1 to 11,
The fixed electrode and the movable electrode are arranged in a vacuum container having a vacuum inside,
The switch is a vacuum insulated switch.
The switch according to claim 12 or 13, and a solid insulator disposed around the fixed electrode and the movable electrode and having a surface at a ground potential,
A busbar connected to the system side for supplying power to the switch, a cable for supplying power from the switch in the switch unit to the load side, and a housing for housing them integrally. Switch gear characterized by