JP2002165319A - Vacuum switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome the problem of a prior art such that a vacuum breaker has fed a current to an external power source and a load, via a rod, from backsides of a movable electrode and a fixed electrode that contact with each other, and then, a big power loss has been induced since a current path has been necessarily prolonged and electric resistance has been accordingly increased. SOLUTION: A load-side conductor 9 and a movable blade 30 are linearly disposed on a movable electrode 7 disposed between a grounding device 6 and a fixed electrode 5, and the movable electrode 7 and the load-side conductor 9 are connected with a flexible conductor 22. Due to the minimum-distance connection available between the movable electrode 7 and the load-side conductor 9 and between the movable electrode and a cable head 10, a current path can be shortened and electric resistance can be reduced to allow switchgear for a circuit to be reduced in size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switch, and more particularly to a vacuum switch suitable for use in, for example, power receiving and transforming equipment.

[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, distribution voltage has been reduced due to difficulties in locating distribution substations, lack of room for distribution pipes, and demands for a high availability of supply facilities. Step-up, that is, actively absorbing the load to a higher voltage system capable of increasing the capacity per line leads to the formation of efficient power supply equipment. 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 Publication No. 143727, the movable electrode is turned left and right around the main shaft, comes into contact with and separates from the fixed electrode, and is closed and closed.

[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 miniaturized vacuum switch 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. is there.

[0008]

According to the present invention, there is provided a ground-side conductor, a load-side conductor, a fixed electrode connected to a multi-phase bus, and a fixed electrode connected to a plurality of phases of a bus arranged in a grounded vacuum vessel. A movable electrode that rotates and comes into contact with and separates from the fixed electrode and the ground-side conductor; a flexible conductor connects between the movable electrode and the load-side conductor; and a movable electrode between the fixed electrode and the ground-side conductor is provided. A vacuum switch is characterized in that the movable electrode, the movable blade, the load side, and the conductor flexible conductor are positioned substantially in a straight line when in the cutoff position.

The movable electrode has a cut-off position and a disconnection position while moving from the input position of the fixed electrode to the ground position of the grounding device.

Further, according to the present invention, a load-side conductor disposed in a grounded vacuum vessel, a fixed electrode connected to a bus of a plurality of phases, and a main shaft that rotates to contact and separate from the fixed electrode. A movable electrode, and the movable electrode and the load-side conductor are connected by a flexible conductor. When the movable electrode between the fixed electrode and the ground-side conductor is at the cutoff position, the movable electrode, the movable blade and the load side are connected. And a flexible switch in which the conductor and the flexible conductor are positioned substantially in a straight line.

[0011]

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, switch gears 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 circuit switch gears will be omitted. Circuit switchgear 2 is phase switchgear 2
It is a set of three phases X, 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 description of the other phase switch gears 2Y, 2Z will be 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 switchgear 1 is electrically connected to a system power supply 12 by a power supply side cable 11 connected to the movable electrode 7.

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 and the movable electrode 7 is separated from the fixed electrode 5 at the disconnection position Y3. 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 or 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 and easy to use. Not only is it good, but also because the movable electrode 7, 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, if the disconnection position Y3 is provided, in the case of different power supply matching, e.g.
When the phase switch gear 2X of the line is operating at the closing position Y1 and the phase 2X of the other line is waiting at the disconnection position Y3, it is not only safe for workers to touch the load side conductor 9 of this circuit. In addition, since the operation can be performed continuously even when switching from standby to operation or from operation to standby, the operation 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 is provided with an operation compartment 17 and a conductor compartment 18 above and below 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. The conductor compartment 18 is disposed on the front side before the operation compartment 17 so that the cable head 10 can be safely mounted.

The wall on the front side of the vacuum vessel has nine buttings 2
1 is attached. One side of the three-phase power supply side cable 11 in the first circuit switch gear 1
1 and connected to an external system power supply 12. Second
In each of the third circuit switch gears 2 and 3, the three-phase one-side load-side conductor 9 passes through the butzing 21 and is connected to the cable head 10. At the time of connection, the cable head 10 provided on the load side conductor 9 is inserted. The load-side conductor 9 in the butzing 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
As shown in FIG. 4, a current transformer 13 is provided and penetrates. 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 grounding conductor 38, and the current transformer 13 can all be viewed from the front side to prevent forgetting to attach, and to make the attaching and detaching work easier for the worker, thereby improving the work efficiency. Is being planned.

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 the second and third phases 2X to 2Z and 3X to 3Z are wrapped on the other side to facilitate wiring, prevent mistakes in wiring, and disperse the internal bus to reduce thermal degradation. We take measures such as prevention.

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 made of a flexible conductor, and can be electrically connected even when the ground-side conductor 37 moves. A ground electrode 39 is fixed to the ground conductor 37 on the opposite side. 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 spring 36 always presses the ground electrode 39 toward the movable electrode 7 by the contracted force.

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
A fixed relay fitting 41 and a fixed support fitting 43 are previously attached to both ends of.

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 an extendable 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. To be able to The movable blade 30 rotates in the direction of the arrow with the main shaft 49 as a fulcrum, and
Contact with and away from.

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 operation 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. The ceramic surface of the load-side bushing 21 exposed between the heads 10 is provided with a ground metal layer 54 so that leakage current flows to the ground E via the vacuum vessel 4 so that an operator can move around the cable head 10. Safety measures are in place to prevent danger from contact.

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 the arrow X1, and the place where the movable electrode 7 comes into contact with the ground electrode 39 as shown in FIG. Are pressed by the spring 36 in the direction of the movable electrode. Further, the movable electrode 7 rotates in the arrow direction X2, and
As shown in the figure, the position where the movable electrode 7 is in contact with the fixed electrode 5 and also connected to the load-side conductor 9 is 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 with 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. As a result, the movable electrode 7 and the load-side conductor 9 are easily welded. As a result, in order to separate the welded movable electrode 7 and the load-side conductor 9 from each other, it is possible to use the operation mechanism unit at a minimum if the rotation power of the operation mechanism unit is increased, but it is possible to avoid the enlargement of the operation mechanism unit. Instead, the vacuum circuit breaker becomes large and expensive.

Sliding during the generated heat causes severe wear and short life. Further, when the movable electrode 7 slides on the load-side conductor 9, fine metal particles generated from the movable electrode 7 and the load-side conductor 9 diffuse and remain in the vacuum vessel, so that dielectric breakdown is easily caused.

On the other hand, in the present invention, the movable electrode 7 and the movable electrode 7 are connected between the load-side conductor 9 and the movable electrode 7 by the flexible conductor 22 which does not slide directly on the load-side conductor 9. The welding of the side conductor 9 does not occur, the rotating force of the operating mechanism is not increased as described above, and the operating mechanism can be downsized, and the life of the movable electrode 7 and the load-side conductor 9 is also longer than the above. It is longer and economically advantageous. The flexible conductor 22 connects the load-side conductor 9 and the movable electrode 7 to each other. As described above, the movable electrode 7 does not generate metal fine particles when sliding on the load-side conductor 9 and is insulated. It is clear that the performance is greatly improved compared to the above, and the vacuum vessel 4 can be downsized accordingly.

Further, the present invention can be used even if the grounding device and the disconnection position 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.

The movable electrode 7 disposed between the grounding device 6 and the fixed electrode 5 is connected to the load-side conductor 9 and the movable blade 30.
Are arranged on a straight line, the movable electrode 7 and the load-side conductor 9
The flexible conductor 22 connecting between the movable electrode 7
And the load side conductor 9 and the cable head 10 can be connected in the shortest distance, so that 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. A load-side common conductor 56 is mounted in the grounding type vacuum vessel 4. The load-side common conductor 56 is connected to the load-side conductor 9, and a ground-side contact 57 and a load-side contact 58 are mounted thereon. The ground movable electrode 59 and the movable electrode 7 supported by the vacuum vessel 4 are connected to the ground contact 57 and the load contact 5.
8 are arranged. When the movable electrode 7 is in contact with the load-side contact 58, the movable electrode 59 is separated from the ground-side contact 57, and performs operations opposite to each other. Outside the two electrodes, a flexible conductor 22 is connected between the fixed electrode 5 and the ground-side conductor 37 connected to the multi-phase bus 8 and the two electrodes.
Connected by

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 electrode 5 connected to the buses 8 of a plurality of phases is arranged in a direction perpendicular to the movable electrode 7 and the load-side contact 58, that is, in the lateral direction. It can also be used for a switchgear in which the flexible conductor 22 connects the electrode 59 and the ground contact 58. In addition, if the flexible conductor 22 is used between the fixed electrode 5 and the movable electrode 7, the same effect as that of the present invention can be obtained even when the flexible electrode 22 is connected to something other than the load-side conductor 9 such as a fixed or movable electrode. .

The circuit switchgear of the present invention may be a circuit breaker in which the movable electrode opens and closes with the fixed electrode, a switch such as a vacuum circuit breaker, a disconnector in which the fixed electrode contacts and separates from the movable electrode, and a ground switch. It can also be used as a stand-alone product such as a switch.

[0037]

As described above, according to the present invention, power is supplied from the fixed electrode via the movable electrode to the load-side conductor via the flexible conductor. , The electric resistance is reduced, and the power loss and the generated heat can be reduced accordingly. Also, the movable electrode is connected to the movable electrode with a flexible conductor that does not slide directly on the load-side conductor, so that no welding occurs on the load-side conductor and the movable electrode. Not only can be reduced in size, but also the insulation performance can be improved, so that the vacuum vessel can be further reduced in size. Further, the present invention can be used for a switch from which a grounding device is removed, and the vacuum vessel and the operating mechanism can be reduced in size by removing the grounding device. Therefore, it goes without saying that the vacuum switch can be reduced in size.

If the movable electrode, the load-side conductor, and the movable blade disposed between the grounding device and the fixed electrode are arranged substantially in a straight line, the flexible conductor connecting between the movable electrode and the load-side conductor is Since the movable electrode and the load side conductor and the cable head can be connected with the shortest distance,
The electric resistance is small, and the heat generated in the vacuum vessel is reduced accordingly, so that the size of the vacuum switch can be reduced.

[Brief description of the drawings]

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

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

FIG. 3 is a side sectional view showing the configuration of the circuit switch used in FIG.

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 switch shown in FIG. 3 in a cutoff / disconnection position.

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

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

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

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

[Explanation of symbols]

1-3 circuit switches, 2X-2Y phase switches, 4 ...
Vacuum vessel, 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 on the front page (72) Inventor Makoto Terai 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 Inside Hitachi, Ltd. Power and Electricity Development Division (72) Inventor Minoru Suzuki 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture F-term in Hitachi, Ltd. Kokubu Factory 5G017 AA22 AA23 AA27 BB01 BB02 BB03 BB10 JJ01 5G026 CA02 5G028 GG24

Claims (5)

[Claims] A fixed-side electrode connected to a ground-side conductor, a load-side conductor, and a plurality of phases of buses disposed in a grounded vacuum vessel, and pivots via a main shaft to form the fixed-side electrode. A movable electrode that comes into contact with and separates from the ground-side conductor, a flexible conductor connects the movable electrode and the load-side conductor, and the movable electrode between the fixed electrode and the ground-side conductor is in a blocking position. A vacuum switchgear, wherein the movable electrode, the movable blade, the load side, and the conductor flexible conductor are positioned substantially in a straight line. 2. The vacuum switchgear according to claim 1, wherein said movable electrode has a cut-off position and a disconnection position while moving from a position where the fixed electrode is turned on to a ground position of the grounding device. 3. A fixed electrode disposed in a grounded vacuum vessel, and a movable electrode which rotates through a main shaft and comes into contact with and separates from the fixed electrode, and a flexible connection is provided between the movable electrode and the load-side conductor. Connected by a conductor, when the movable electrode between the fixed electrode and the ground-side conductor is in the cutoff position, the movable electrode and the movable blade and the load side and the conductor flexible conductor are located substantially in a straight line, Vacuum switchgear. 4. The vacuum container according to claim 1, wherein said vacuum vessel is made of a stainless steel member.
The vacuum switchgear according to the item. 5. The vacuum switchgear according to claim 1, wherein a butting of a ceramic member is used at the entrance and exit of the vacuum vessel.