JP2000082367A - Switch and switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a current passage and reduce an electric resistance and a power loss and generated heat by feeding a power from a movable electrode to a conductive body on the load side through a fixed electrode and a flexible conductive body. SOLUTION: A movable electrode 7 is disposed between an earth device 6 and a fixed electrode 5 and is moved in the arrow X1 direction from this position. When the movable electrode 7 is contacted with an earth electrode 39, the earth electrode 39 is pressed toward the movable electrode 7 by a spring 36. When the movable electrode 7 is moved in the arrow X2 direction, it is contacted with a fixed electrode 5 and is also connected to a load side conductive body 9. In this case, a tip end of the movable electrode 7 and the load side conductive body 9 are connected by a flexible conductive body 22. Accordingly, since a power is fed from the fixed electrode 5 to the load side conductive body through the movable electrode 7 and the flexible conductive body 22, a current passage can be shortened and an electric resistance becomes small. Therefore, a power loss, i.e., generated heat becomes small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch and a switchgear using the switch, and more particularly to a small and inexpensive new vacuum switch and vacuum switchgear.

[0002]

2. Description of the Related Art In response to an increasing demand in an area where power consumption is concentrated in an urban area, the distribution voltage has been reduced due to difficulties in locating distribution substations, lack of room for distribution pipes, and demands for a high supply facility operation rate. , That is, actively absorbing the load to a higher voltage system capable of increasing the capacity per line leads to the formation of an efficient power supply facility. For this reason, it is necessary to further reduce the size of distribution equipment and power receiving and transforming equipment.

[0003] As a power receiving and transforming device for downsizing, for example, an SF ₆ gas insulated switchgear described in Japanese Patent Application Laid-Open No. 3-273804 can be considered. In this switchgear, a circuit breaker, two disconnectors, and a grounding switch are individually manufactured and housed in a unit room and a bus room in which a distribution box is filled with insulating gas. When using a vacuum circuit breaker as a circuit breaker,
The movable electrode moves up and down with respect to the fixed electrode by the operation device of the vacuum circuit breaker, and is turned on and off.
As in the vacuum circuit breaker described in Japanese Patent No. 143727, the movable electrode is turned right and left around the main shaft as a fulcrum, and comes into contact with and separates from the fixed electrode, thereby closing and closing.

[0004] The gas insulated switchgear receives, for example, electric power from a power company by a disconnector and a gas circuit breaker, changes the voltage to a voltage optimal for a load by a transformer, and supplies the load, for example, a motor. To maintain and inspect the substation equipment,
After turning off the gas circuit breaker, open the disconnector provided separately from the gas circuit breaker, and further ground the ground switch to allow residual charge and induced current to flow to the ground and prevent re-application from the power supply And keep the safety of workers. Further, if the grounding switch is grounded while the bus is charged, an accident may occur. Therefore, an interlock is provided between the disconnecting switch and the grounding switch.

[0005]

Problems to be Solved by the Invention For example, Japanese Patent Application Laid-Open No. 3-27380
The SF ₆ gas insulated switchgear described in Japanese Patent Publication No. 4 is separately manufactured and accommodated with a gas circuit breaker, two disconnectors and a grounding switch in a unit room and a bus room filled with SF ₆ gas in a distribution box. are doing. When a vacuum circuit breaker is used as a circuit breaker, the movable electrode is moved up and down with respect to the fixed electrode by the operation device of the vacuum circuit breaker.
In the vacuum circuit breaker described in Japanese Patent Application Laid-Open No. 55-143727, a movable lead wire and a movable electrode corresponding to a movable blade are rotated left and right with a main shaft as a fulcrum so as to come into contact with and separate from a fixed electrode, thereby closing and closing. ing.

However, in these vacuum circuit breakers, after the movable electrode is applied to the fixed electrode, the movable electrode is connected to the power source and the cable head on the load side via rods which are the movable and fixed lead wires connected to both electrodes. Therefore, the connection distance becomes longer, and power loss and generated heat increase.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum switchgear in which the distance between the movable electrode and the fixed electrode to the power supply and the cable head on the load side is shortened to reduce power loss and generated heat, thereby reducing the size. It is in.

[0008]

SUMMARY OF THE INVENTION The present invention provides a grounding device arranged in a grounded vacuum vessel, a load-side conductor, a fixed electrode connected to a multi-phase bus, and the fixed electrode and the grounding device. The present invention relates to a switchgear having a movable electrode that comes into contact with and separates from a movable electrode, and a flexible conductor that electrically connects the movable electrode to a load-side conductor.

The present invention also provides a load-side conductor disposed in a grounded vacuum vessel, a fixed electrode electrically connected to a bus of a plurality of phases, a movable electrode which comes into contact with and separates from the fixed electrode, and Provided is a switchgear having a flexible electrode that electrically connects a movable electrode and a load-side conductor. While the movable electrode moves from the input position of the fixed electrode to the grounding position of the grounding device, it can take a blocking position and a disconnection position. Most of the vacuum container is made of stainless steel so that it can be grounded.

The present invention further provides a load-side conductor disposed in a grounded vacuum vessel, a fixed electrode electrically connected to the buses of a plurality of phases, a movable electrode which comes into contact with and separates from the fixed electrode, Provided is a switch having a flexible conductor that electrically connects a movable electrode and a load-side conductor. The present invention relates to a ground-side contact and a load-side contact attached to a load-side common conductor disposed in a grounded vacuum vessel, a ground movable electrode and a movable electrode that come into contact with and separate from both contacts, respectively, and a multi-phase bus. A switch having a fixed electrode connected to the fixed electrode and a flexible conductor electrically connecting the fixed electrode and the movable electrode.

The present invention further provides a vacuum switchgear having an operation compartment containing an operation mechanism, a switch provided with a conductor compartment accommodating a load-side conductor, and a vacuum vessel, wherein the switch is grounded. A vacuum container, a fixed electrode disposed in the vacuum container, a movable electrode disposed in the vacuum container, and a fixed electrode disposed in the vacuum container to electrically insulate the vacuum container from the fixed electrode. There is provided a switchgear including an insulating cylinder, a movable insulating cylinder disposed in the vacuum vessel and electrically insulating the vacuum vessel and the movable electrode, and a bus bar electrically connected to the fixed electrode. The present invention also provides a grounded vacuum vessel, a fixed electrode disposed in the vacuum vessel, a movable electrode grounded in the vacuum vessel, and a movable electrode disposed in the vacuum vessel. A fixed insulating cylinder that insulates the fixed electrode, a movable insulating cylinder that is disposed in the vacuum vessel and insulates the vacuum vessel and the movable electrode, a bus bar connected to the fixed electrode, and is insulated from the vacuum vessel A switch including a load-side conductor, a flexible conductor connecting the load conductor and the movable electrode, and a switchgear including an operation compartment and a conductor compartment.

According to the present invention, a fixed electrode, a movable electrode, a load-side conductor and a bus bar electrically connected to the fixed electrode, and the fixed electrode and the vacuum vessel are electrically connected in a grounded vacuum vessel. A fixed insulating cylinder to insulate, a plurality of switches including a movable insulating cylinder to electrically insulate the movable electrode from the vacuum vessel, a conductor compartment for accommodating a plurality of conductors corresponding to the load-side conductor, Provided is a switchgear including an operation compartment having a built-in operation mechanism for a movable electrode, and the conductor compartment.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The circuit diagram of FIG. 1 shows the entirety of the collective switchgear, and FIG. 2 shows an electric circuit adapted to the structure of the circuit switchgear for one circuit of FIG.
3 and 4 show the structure of the circuit switchgear for one circuit. FIG. 5 shows a relay terminal plate 27 for connecting each phase of the circuit switchgear with a bus.

For example, switchgears 1 for multiple circuits for three circuits
2 and 3 were placed in a vacuum vessel 4 grounded E. Since the circuit switch gears 1, 2, and 3 have the same configuration, the second circuit switch gear 2 will be described, and the description of the other switch gears will be omitted. The circuit switchgear 2 is a phase switchgear 2X,
It is a set of three phases 2Y and 2Z. Since each phase switch gear 2X, 2Y, 2Z has the same configuration, only the first phase switch gear 2X will be described, and other phase switch gears 2X, 2Y, 2Z will be described.
The description of Y and 2Z is omitted.

The phase switchgear 2X is a combination of a breaking function, a disconnecting function, a grounding function and a bus. That is, the phase switch gear 2X mainly includes the movable electrode 7 that moves between the fixed electrode 5 and the grounding device 6.
The fixed electrode 5 is connected to the internal bus 8. The movable electrode 7 is connected to a load-side conductor 9, and the load-side conductor 9 is connected to a cable head 10 extending outside the vacuum vessel. In addition, the movable electrode 7 is mechanically connected to a movable blade described later, and is rotated vertically or horizontally by rotation of a movable blade driven by an operation mechanism (not shown). Movable electrode 7
Moves from the fixed electrode 5 to the grounding device 6, 4 in FIG.
Stop in position. The circuit switch gear 1 has a movable electrode 7
Is electrically connected to the system power supply 12 by the power supply side cable 11 connected to the power supply.

That is, as the movable electrode 7 rotates,
The movable electrode 7 is energized at the input position Y1 where the movable electrode 7 contacts the fixed electrode 5, and rotates below the input position Y1 to separate the movable electrode 7 from the fixed electrode 5 at the cutoff position Y2 and cut off the current. Further, the movable electrode 7 is rotated downward to separate the fixed electrode 5 from the fixed electrode 5 at the disconnection position Y3, so that insulation is not broken by lightning or the like, and an insulation distance is provided so that the worker is not electrocuted on the load conductor side. The movable electrode 7 is further below.
Rotates, and the movable electrode 7 contacts the grounding device 6 at the grounding position Y4. It should be noted that omitting the disconnection position Y3 and moving from the interruption position Y2 to the ground contact position Y4 does not impair the following effects of the present invention. Since the movable electrode 7 can continuously have four positions, that is, a plurality of functions by one operation while the movable electrode 7 rotates from the fixed electrode 5 to the grounding device 6 in a vacuum, which is a high insulator, it is easy to operate. Is good. The movable electrode 7,
Since the fixed electrode 5 and the grounding device 6 are integrated in one place, the size can be further reduced as compared with the above-described conventional technology. Further, when the disconnection position Y3 is provided, in the case of different power supply matching, for example, in a two-line power receiving having two system power supplies, the phase switch gear 2X is operating at one of the lines at the closing position Y1, and the phase 2X of the other line is in the disconnection position. During standby at Y3, it is safe even if an operator contacts the load-side conductor 9 of this circuit. When switching from standby to driving or from driving to standby, the operation can be performed continuously, so that the working speed is high and the operation is easy. Further, the current flowing through the current transformer 13 is detected by the current transformer 13, and the protection relay 14 is operated to trip an operation mechanism (not shown), thereby coping with a system failure.

The vacuum vessel 4 which is grounded E is made of a stainless steel member, a part of which is formed in a spherical or curved shape to increase the mechanical strength of the vacuum vessel 4 and reduce the thickness of the vacuum vessel wall. To reduce weight. The vacuum vessel 4 is the switchboard 1
6 is stored. The switchboard 16 has an operation compartment 17 and a conductor compartment 18 on the upper and lower sides of the vacuum vessel 4. The operation compartment 17 is disposed so as to be recessed on the right side, that is, the depth side of the vacuum vessel 4, and has a door 19 which can be opened and closed on the front side. The conductor compartment 18 is disposed on the left side of the vacuum vessel 4, that is, on the near side. The operation compartment 17 and the conductor compartment 18 are arranged obliquely and symmetrically via the vacuum container 4. The operation compartment 17 houses an operation mechanism for rotating the movable blade and the movable electrode 17. The conductor compartment 18 houses the load-side conductor 9 and the cable head 10. A tool or the like for maintenance and inspection of the inside of the operation compartment can be placed on the vacuum container on the front side of the operation compartment 17 and maintenance and inspection is easy. Further, the conductor compartment 18 is arranged on the front side before the operation compartment 17 so that the cable head 10 can be safely mounted.

Nine bushings 21 are mounted on the wall on the front side of the vacuum vessel. In the first circuit switchgear 1, one side of the three-phase power supply side cable 11 is connected to an external system power supply 12 through a bushing 21. In each of the second and third circuit switchgears 2 and 3, the three-phase one-side load-side conductors 9 pass through the bushings 21 and are connected to the cable head 10. When connecting, load side conductor 9
This is performed by inserting the cable head 10 provided in the above. The load-side conductor 9 in the bushing 21 uses a flexible conductor 22 and is connected to a load such as a transformer or a motor. Second
For each phase of the cable head 10 of the circuit switchgear 2
A current transformer 13 is provided as shown in FIG. Current transformers 13 are provided in other circuit switchgears 1 and 3 as needed, such as load conditions.

The grounding devices 6 correspond to the nine cable heads, are arranged above the cable heads, and connect the common grounding conductor 24 with the grounding conductor 38. Both ends of the common ground conductor 24 are fixed to the switchboard 16 by ground screws 25. The cable head 10, the ground conductor 38, and the current transformer 13 can all be viewed from the front side to prevent forgetting to attach, and to facilitate the attaching and detaching work by the worker, thereby improving work efficiency. Is being improved.

In FIG. 1, the internal bus 8 directly connects the circuit switch gears between the switch gears for each of the three circuits. However, this is because the circuit switch gears are directly connected for easy understanding of the embodiment. is there. In practice, the relay terminal plate 27 of FIG. 1 has a relay terminal plate 27 having a relay terminal 26 constituted by a part of the nine fixed electrodes 5 of FIG. The internal bus 8 is connected. When arranging each internal bus 8 on the relay terminal plate 27, the order goes from the left side to the right side of the relay terminal plate 27,
Internal buses 8 from the first circuit switchgear to the second and third circuit switchgears are arranged. In the arrangement, the internal bus 8 of each circuit switchgear is connected to the first phase 1X, 2X, 3X.
Are arranged on one side while wrapping the second and third phases 2X to 2Z and 3X to 3Z on the other side to facilitate wiring, to prevent wiring mistakes, and to prevent thermal deterioration by dispersing the internal buses. And other measures.

First to third circuit switch gears 1 to 3
Is disposed in a vacuum vessel grounded E and has the following configuration. However, since the phase switch gears 2X to 2Z have the same configuration, only the configuration of the phase switch gear 2X for one phase will be described. The description of the other phase switch gears 2Y and 2Z is omitted.
A movable electrode 7 that rotates between a grounding device 6 and a fixed electrode 5 disposed corresponding to the grounding device 6 is disposed inside the vacuum vessel 4 that is grounded E, and a cable head 10 is disposed corresponding to the movable electrode 7. , Are arranged in a cross shape as a whole. The grounding device 6, the movable blade 30, and the load-side conductor 9 that extend through three through holes (not shown) formed in the vacuum vessel 4 extend outside the vacuum vessel.

The grounding device 6 has a grounding-side bottom fitting 31 at one end, a grounding-side bushing 32 made of a ceramic material having an open end at the other end, and a flange 33 provided on the outer periphery of the grounding-side bushing 32. The ground-side sealing fitting 34 attached to the reference numeral 33 is welded to the vacuum container 4. A grounding bellows 35, a spring 36, and a grounding conductor 37 are arranged in the grounding bushing. The ground-side conductor 37 extends to the outside through the ground-side bottom fitting 31, and the end of the ground-side conductor 37 is connected to the above-mentioned common ground conductor 24 by a screw. The ground conductor 38 is formed of a flexible conductor,
Even when the ground-side conductor 37 moves, it can be electrically connected.
A ground electrode 39 is provided on the ground conductor 37 on the opposite side.
Is fixed. When the ground electrode 39 is pushed toward the ground-side bottom metal fitting, the spring 36 contracts together with the ground-side bellows 35. At this time, the ground electrode 39 is constantly pressed in the direction of the movable electrode 7 by the force of contracting the spring 36.

The fixed electrode 5 corresponding to the grounding device 6 is connected to the internal bus 8 of three phases. The three-phase internal buses 8 are arranged as shown in FIG. The fixed electrode 5 and the relay terminal 26 are supported by a fixed insulating cylinder 42 made of a ceramic material via a fixed relay fitting 41. A fixed support 43 supporting the other end of the fixed insulating cylinder 42 is fixed to the vacuum vessel with a brazing material. That is, the fixed insulating cylinder 42
The fixed relay fittings 41 and the fixed support fittings 43 are attached to both ends in advance.

The movable electrode 7 is disposed between the grounding device 6 and the fixed electrode 5, and the movable electrode 7 is supported by a movable insulating cylinder 45 made of a ceramic material via a movable relay fitting 44. One end is supported by the movable support bracket 46 as described above, and the movable support bracket 46 is supported by the movable blade 30. The movable blade 30 extends outside through the movable support plate 47. The movable support plate 47 is fixed to the vacuum container 4. The movable blade 30 is surrounded by a telescopic movable bellows 48, one end of which is attached to the movable support bracket 46 and the other end of which is attached to the movable support plate 47, and the movable blade 30 rotates left and right and up and down. To be able to The movable blade 30 has a main shaft 49.
Is rotated in the direction of the arrow with the fulcrum as a fulcrum, and comes into contact with and separates from the grounding device 6 and the fixed electrode 5.

The movable blade 30 is rotated about a main shaft 49 as a fulcrum by the driving of an operating mechanism (not shown) connected to the tip of the movable blade 30. The operation shaft 50 connects the movable blade 30 and the operation mechanism. Note that a structure in which only the movable electrode is provided at the tip of the movable blade 30 may be used. In this case, any one of the movable blade and the operating mechanism needs an insulating means for cutting off the voltage.

The tip of the movable electrode 7 and the load-side conductor 9 are connected by a flexible conductor 22. Load side conductor 9
Are connected to the cable head 10 through a load side bushing 21 made of a ceramic material. A load-side sealing fitting 53 is provided at an end of the load-side bushing 21, and the load-side sealing fitting 53 is welded to a brazing material around an opening opened in the vacuum vessel 4 and supported, and a cable is connected to the outside of the vacuum vessel 4. The ceramic surface of the load side bushing 21 exposed between the heads 10 is provided with a ground metal layer (not shown),
Allowing the leakage current to flow to ground E via vacuum vessel 4;
Safety measures are taken so that no danger arises even if an operator comes into contact with the periphery of the cable head 10.

Next, the operation of the phase switch gear will be described with reference to FIGS. The movable electrode 7 is disposed between the grounding device 6 and the fixed electrode 5 as shown in FIG.
And the disconnection position Y3. From this position, the movable electrode 7 is rotated in the direction of arrow X1, and the place where the movable electrode 7 contacts the ground electrode 39 as shown in FIG. Are pressed by the spring 36 in the direction of the movable electrode. The movable electrode 7 rotates in the arrow direction X2, and as shown in FIG. 8, the movable electrode 7 is in contact with the fixed electrode 5 and is also connected to the load-side conductor 9 at the closing position Y1.

At the input position Y1, the movable electrode 7 is
And is connected to the load-side conductor 9.
In this case, unlike the related art, power is supplied from the movable electrode 7 to the load-side conductor 9 via the fixed electrode 5 and the flexible conductor 22 without passing through the movable blade 30. Compared to this, the power consumption can be greatly reduced, the electric resistance is reduced, and the power loss and the generated heat can be reduced accordingly.

On the other hand, power is always supplied to the load at the input position Y1, the operation time is longer than the operation time at other positions, and if the flexible conductor 22 is not used, the movable electrode 7 is directly connected to the load. Sliding contact with the conductor 9 is conceivable. This means that the movable electrode 7 is in direct sliding contact with the load-side conductor 9 and the current continues to flow while the movable electrode 7 and the load-side conductor 9 are in contact with each other. Accordingly, the movable electrode 7 and the load-side conductor 9 are easily welded. As a result, the welded movable electrode 7
If the rotating force of the operating mechanism is increased to separate the load-side conductor 9 and the operating mechanism, it can be used at a minimum, but the size of the operating mechanism cannot be avoided, and the vacuum circuit breaker is increased in size and cost. Get high.

Further, the sliding during the generated heat means that the wear is severe and the life is short, and when the movable electrode 7 slides on the load side conductor 9, the metal fine particles generated from the movable electrode 7 and the load side conductor 9 are evacuated. Since it is diffused and remains in the container, dielectric breakdown easily occurs. In contrast, in the present invention, the movable electrode 7
Flexible conductor 22 which does not slide directly on the load side conductor 9
The connection between the load-side conductor 9 and the movable electrode 7 is established by the above, so that welding of the movable electrode 7 and the load-side conductor 9 does not occur.
The turning power of the operating mechanism is not greater than that described above, and the operating mechanism can be downsized. Further, the lives of the movable electrode 7 and the load-side conductor 9 are longer than those described above, which is economically advantageous. The flexible conductor 22 connects the load-side conductor 9 and the movable electrode 7 to each other.
It is evident that the metal particles do not generate metal particles when sliding on the load-side conductor 9, and the insulation performance is significantly improved as compared with the above, and the vacuum vessel 4 can be downsized accordingly.

Furthermore, the present invention can be used even if the grounding device and disconnecting device are removed, and when removed, the vacuum vessel and the operating mechanism can be further reduced in size, so that the circuit switchgear can of course be reduced in size. In addition, the movable electrode 7 disposed between the grounding device 6 and the fixed electrode 5 may be arranged such that the load-side conductor 9 and the movable blade 30 are arranged in a straight line. In addition, since the cable heads 10 can be connected at an optimum distance, the electric resistance is reduced, and the heat generated in the vacuum vessel can be reduced accordingly. Further, since the flexible conductor 22 is used, the movable electrode 7 can be rotated left and right while being electrically connected to the load-side conductor 9.

Next, another embodiment will be described with reference to FIGS. The load-side common conductor 56 is mounted in the grounded vacuum vessel 4. The load-side common conductor 56 is connected to the load-side conductor 9 and has a ground contact 57 and a load-side contact 5 thereon.
8 is installed. The ground movable electrode 59 and the movable electrode 7 supported by the vacuum vessel 4 are arranged corresponding to the ground contact 57 and the load contact 58. When the movable electrode 7 is in contact with the load contact 58, the movable electrode 59 is separated from the ground contact 57, and the movable electrode 59 is separated from the ground contact 57.
When the movable electrode 7 is in contact with the load-side contact 58, the movable electrode 7 is separated from the load-side contact 58. Outside the two electrodes, a flexible conductor 22 connects between the fixed electrode 5 and the ground-side conductor 37 connected to the multi-phase bus 8 and both electrodes.

That is, when the movable electrode 7 and the load contact 57 are in contact with each other, the movable electrode 7 is moved upward from the load contact 58, and at the same time, the ground movable electrode 59 is moved downward and the ground contact 58 is moved. To ground. In the former case, the state is changed from the closed state to the closed state. In this embodiment, the fixed electrodes 5 connected to the buses 8 of a plurality of phases are arranged in a direction perpendicular to the direction in which the movable electrode 7 and the load-side contact 58 contact and separate, that is, in the lateral direction. A flexible conductor 2 is connected between the fixed electrode 5 and the movable electrode 7 and between the ground movable electrode 59 and the load side contact 58.
It can also be used for switchgear connected by 2. Further, the fixed electrode 5 and the movable electrode 7 are connected by a flexible conductor 22 and can be used as a switch gear. Further, if the flexible conductor 22 is used, the same effect as that of the present invention can be obtained even when the flexible conductor 22 is connected to anything other than the load-side conductor 9 such as a fixed or movable electrode. In addition to the above, the circuit switch according to the present invention includes a circuit breaker in which the movable electrode opens and closes with the fixed electrode, a switch such as a vacuum circuit breaker,
It can also be used as a stand-alone product such as a disconnector, ground switch, switch, etc., in which the fixed electrode and the movable electrode come and go.

[0034]

As described above, according to the switch and switchgear of the present invention, power is supplied to the load-side conductor from the movable electrode via the fixed electrode and the flexible conductor.
The current path can be greatly reduced compared to the prior art.
As a result, the electric resistance is reduced, and the power loss and the generated heat can be reduced accordingly. In addition, since the movable electrode and the load-side conductor are electrically connected by a flexible conductor so as not to slide, welding does not occur on the load-side conductor and the movable electrode.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a collective switchgear according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a circuit switchgear of FIG. 1;

FIG. 3 is a side sectional view showing a configuration of a circuit switchgear used in FIG. 1;

FIG. 4 is a front view of FIG. 2 as viewed from the left side.

FIG. 5 is a plan view of the bus connection terminal plate shown in FIGS. 1 and 3;

FIG. 6 is a side sectional view of the circuit switchgear shown in FIG.

7 is a side sectional view of the circuit switchgear shown in FIG. 3 at a ground position.

FIG. 8 is a side sectional view of the circuit switchgear shown in FIG. 3 in a closed position.

FIG. 9 is a side sectional view showing a configuration of a circuit switchgear according to another embodiment of the present invention.

FIG. 10 is a side sectional view showing a grounded state of the circuit switchgear of FIG. 9;

[Explanation of symbols]

1-3 circuit switches, 2X-2Z phase switches, 4 ...
Vacuum container, 5: fixed electrode, 6: grounding device, 7: movable electrode, 8: internal bus, 9: load side conductor, 11: power supply side cable, 22: flexible conductor, 30: movable blade.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Shuichi Kikugawa, Inventor 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Ayumu Morita 7-2, Omikamachi, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Power and Electricity Development Division (72) Inventor Minoru Suzuki 1-1-1, Kokubuncho, Hitachi City, Hitachi, Ibaraki, Japan Kokubu Plant, Hitachi, Ltd.

Claims (8)

[Claims] 1. A grounding device disposed in a grounded vacuum vessel, a load-side conductor, a fixed electrode electrically connected to a plurality of buses, and a contact / separation between the fixed electrode and the grounding device. A switch comprising: a movable electrode; and a flexible conductor that electrically connects the movable electrode and a load-side conductor. 2. The switch according to claim 1, wherein the movable electrode takes a cut-off position and a disconnection position while moving from the closing position of the fixed electrode to the grounding position of the grounding device. 3. A load-side conductor disposed in a grounded vacuum vessel, a fixed electrode electrically connected to a bus of a plurality of phases, a movable electrode which comes into contact with and separates from the fixed electrode, and And a flexible conductor for electrically connecting the load-side conductor to the load-side conductor. A ground-side contact and a load-side contact attached to a load-side common conductor disposed in a grounded vacuum vessel; a ground-side movable electrode and a movable electrode that are respectively connected to and separated from both contacts; A switch having a fixed electrode electrically connected to the bus bar, and a flexible conductor electrically connecting the fixed electrode and the movable electrode. 5. The switch according to claim 1, wherein a majority of said vacuum vessel is made of stainless steel. 6. A switchgear having an operation compartment containing an operation mechanism, a conductor compartment containing a load-side conductor, and a switch provided with a vacuum container, wherein the switch comprises a grounded vacuum container, A fixed electrode disposed in the vacuum vessel, a movable electrode disposed in the vacuum vessel, a fixed insulating cylinder disposed in the vacuum vessel and electrically insulating the vacuum vessel and the fixed electrode, A switchgear, comprising: a movable insulating cylinder disposed in the vacuum vessel to electrically insulate the vacuum vessel from the movable electrode; and a bus bar electrically connected to the fixed electrode. 7. A grounded vacuum vessel, a fixed electrode disposed in the vacuum vessel, a movable electrode grounded in the vacuum vessel, and a fixed electrode disposed in the vacuum vessel, wherein the vacuum vessel is fixed to the vacuum vessel. A fixed insulating cylinder that insulates the electrodes, disposed in the vacuum vessel,
A movable insulating cylinder that insulates the vacuum vessel and the movable electrode, a bus bar connected to the fixed electrode, a load-side conductor insulated from the vacuum vessel, and a flexible conductor that connects the load conductor and the movable electrode. And a switchgear having an operating compartment and a conductor compartment. 8. A fixed electrode, a movable electrode, a load-side conductor, and a bus electrically connected to the fixed electrode, and electrically insulate the fixed electrode from the vacuum container in a grounded vacuum vessel. A fixed insulating cylinder, a plurality of switches each including a movable insulating cylinder for electrically insulating the movable electrode from the vacuum vessel, a conductor compartment for accommodating a plurality of conductors corresponding to the load-side conductor, A switchgear including an operation compartment containing an operation mechanism and the conductor compartment.