JPH1189027A - Switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a distance for connecting a movable electrode to a fixed electrode to a cable head on power supply and load side for minimum power loss, and to reduce generated heat and size reduction, by fitting the movable electrode which is connected and disconnected to/from the fixed electrode and a grounded device, and connecting a section between the movable electrode and load side conductor through a flexible conductor. SOLUTION: A movable electrode 7 connects a section between a load side conductor 9 and the movable electrode 7 through a flexible conductor 22 not sliding directly on the load side conductor 9, so that no deposits occur at the movable electrode 7 and the load side conductor 9, the rotational force of an operating mechanism part does not increase, the size of the operating mechanism part can be reduced, and the service life of the movable electrode 7 and the load side conductor 9 becomes longer. By connecting a section between the load side conductor 9 and the movable electrode 7, no metallic vapor occurs when the movable electrode 7 slides on the load side conductor 9, so that current cut-off characteristics can be improved, thereby attaining size reduction in a vacuum container 4. Even if a grounded device and isolation position are eliminated, it is possible to make use of it and attain size reduction in the vacuum container and operating mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switchgear, and more particularly to a new hybrid type vacuum switchgear in which at least one of a circuit breaker, disconnector, load switch, and grounding device is assembled. Regarding the structure.

[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, it is difficult to locate a substation for distribution with 6 KV supply.
Due to the lack of room for distribution pipes and an increase in the operation rate of the 6KV supply facility, it is possible to efficiently increase the distribution voltage, that is, actively absorb the load to a 22KV system having a larger capacity per line than 6KV, which results in efficient power supply. It leads to equipment formation.
For this reason, it is necessary to reduce the size of the 22KV distribution equipment to about 6KV. As the receiving and transforming equipment for downsizing, for example, the S described in JP-A-3-273804 is disclosed.
F ₆ gas insulated switchgear can be considered. In this switchgear, a circuit breaker, two disconnectors, and a grounding switch are separately manufactured and housed in a unit room and a bus room in which a distribution box is filled with insulating gas. When a vacuum circuit breaker is used as the 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, and the movable electrode is turned on and off, or described in JP-A-55-143727. In the vacuum circuit breaker, the movable electrode is turned right and left around the main shaft, and comes into contact with and separates from the fixed electrode, and is turned on and off.

A gas insulated switchgear receives, for example, electric power from an electric 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 electric power to a load, such as a motor. To maintain and inspect the substation equipment,
After disconnecting the gas circuit breaker, open the disconnector provided separately from the gas circuit breaker, and further ground the grounding switch, so that the residual charge and the induced current on the power supply side flow to the ground, and The application of voltage is prevented to protect the worker's safety. 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.

[0004]

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. 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 pivoted right and left around a main shaft to contact and separate from a fixed electrode.
It is shut off.

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 lead wires on the movable side and the fixed side connected to both electrodes. Therefore, the connection distance becomes longer, and power loss and generated heat increase.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vacuum switchgear in which the distance between the movable electrode and the fixed electrode connected 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.

[0007]

According to a first aspect of the present invention, there is provided a grounding device disposed in a grounded vacuum vessel, a fixed electrode connected to a load-side conductor and a multi-phase bus, and a main shaft. A movable electrode that comes into contact with and separates from the fixed electrode and the grounding device,
A vacuum switchgear characterized by connecting a movable electrode and a load-side conductor with a flexible conductor.

According to a second aspect of the present invention, there is provided a vacuum switchgear according to the first aspect, wherein the movable electrode has a cutoff position and a disconnection position while moving from the input position of the fixed electrode to the grounding position of the grounding device. .

According to a third aspect of the present invention, there is provided a fixed electrode connected to a load-side conductor and a bus of a plurality of phases disposed in a grounded vacuum vessel, and a movable electrode which comes into contact with and separates from the fixed electrode via a main shaft. Wherein the movable electrode and the load-side conductor are connected by a flexible conductor.

According to a fourth aspect of the present invention, there is provided a fixed electrode connected to a load-side conductor and a bus of a plurality of phases arranged in a grounded vacuum vessel, and linearly moving and approaching and separating from the load-side conductor. A vacuum switchgear, comprising: a movable electrode, and a fixed conductor arranged in a direction perpendicular to the movable electrode and a movable electrode connected by a flexible conductor.

According to a fifth aspect of the present invention, the movable electrode and the load-side conductor arranged between the vacuum vessel ground conductor and the fixed electrode are arranged in a cross shape.
The described vacuum switchgear.

According to a sixth aspect of the present invention, there is provided a ground-side contact and a load-side contact attached to a load-side common conductor disposed in a grounded vacuum vessel, and a movable-side ground electrode and a movable-side ground electrode which come into contact with and separate from both contacts. An electrode, wherein the movable-side ground electrode and the movable electrode are connected to the ground conductor and a fixed electrode connected to the multi-phase bus via a flexible conductor.

A seventh aspect of the present invention is the vacuum switchgear according to any one of the first to sixth aspects, wherein most of the vacuum container is formed of a stainless steel member.

According to an eighth aspect of the present invention, there is provided the switchgear according to any one of the first to seventh aspects, wherein a bushing made of a ceramic member is used for the entrance and exit of the vacuum vessel.

A ninth aspect of the present invention is the vacuum switchgear according to any one of the first to seventh aspects, wherein a high melting point metal member is used for the electrode.

According to a tenth aspect of the present invention, there is provided a fixed electrode connected to a load-side conductor and a plurality of phase buses disposed in a container having a grounded insulating medium; And used for a switchgear in which one or more of a circuit breaker, a disconnector, a load switch, and a grounding device in which a movable electrode and a load-side conductor are connected by a flexible conductor are assembled. And vacuum switchgear.

According to a eleventh aspect of the present invention, there is provided a fixed electrode connected to a load-side conductor and a bus of a plurality of phases disposed in a grounded container having an insulating medium, and a movable electrode contacting and separating from the fixed electrode. Wherein the movable electrode and the load-side conductor are connected by a flexible conductor.

[0018]

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 entire hublit type switchgear, and FIG. 2 is viewed from the front side of the drawing, for example, from the paper surface side. FIGS. 3 and 4 show one circuit switchgear of FIG. It is. FIG. 5 shows a relay terminal plate that connects the switch gears of each phase circuit with a bus.

The switch gears 1, 2, 3 for three circuits, for example, three phases, are arranged in the vacuum vessel 4 which is grounded. Since the switch gears 1, 2 and 3 for the three circuits have the same configuration,
The switch gear 2 for three circuits will be described, and the description of the switch gears for the other three circuits will be omitted. The switch gear 2 for three circuits is a group of three circuit switches 2X, 2Y and 2Z. Since the switch gears 2X, 2Y, 2Z for the respective circuits have the same configuration, only the switch gear 2X for the circuit will be described, and the description of the switch gears 2Y, 2Z for the other three circuits will be omitted.

The circuit-specific switchgear 2X is formed by integrally integrating a shutoff function, a disconnection function, a grounding function, and a bus.
That is, the circuit-specific switch gear 2 </ b> X 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). When the movable electrode 7 moves from the fixed electrode 5 to the grounding device 6, it stops at the four positions in FIG. The switch gear 1 for three circuits is connected to the system power supply 1 by a power supply side bus 11 connected to the movable electrode 7.
2 is electrically connected.

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. Four positions can be continuously performed by one operation while the movable electrode 7 rotates from the fixed electrode 5 to the grounding device 6 in a vacuum of a high insulator, so that the operation is easy and the usability is good. In addition, since 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, when the disconnection position Y3 is provided, the switchgear 2X for one circuit is switched to the closing position Y1 in different power supply butting, for example, two lines.
When the switchgear 2Y for the circuit of the other line is in standby at the disconnection position Y3, it is not only safe for an operator to come into contact with the load-side conductor 9, but also during operation or during operation. Since the work can be performed continuously even when switching to standby, the work speed is fast and the operation is easy.

Further, as described above, when the insulation performance deteriorates due to the vacuum leak in the vacuum vessel 4 and the positive discharge occurs to the ground, the current is detected by the current transformer 13 and the protection relay 14 is operated to operate the movable electrode. By tripping the operating mechanism (not shown) so as not to operate the vacuum valve 7, damage to the vacuum valve is prevented. Of course, this can be similarly applied to a system short circuit accident.

The vacuum vessel 4 which is grounded E uses a stainless steel member, and a part thereof is formed in a spherical or curved shape to increase the mechanical strength of the vacuum vessel 4 or reduce the thickness of the vacuum vessel wall. To reduce weight. The vacuum vessel 4 is housed in a switchboard 16. The switchboard 16 has an operation compartment 17 and a conductor compartment 18 on the upper and lower sides of the vacuum vessel 4. Operation compartment 1
7 is recessed and arranged on the right side, that is, the depth side of the vacuum vessel 4,
An openable and closable door 19 is mounted on the front side. The conductor compartment 17 is arranged 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 vessel 4. The operation compartment 17 houses an operation mechanism for rotating the movable blade and the movable electrode 7. 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 operated in the operation compartment 1
The cable head 10 is disposed on the front side before 7 so that the cable head 10 can be mounted safely.

The front wall of the vacuum container has nine bushings 2
1 is attached. One side of the three-phase power supply side bus 11 of the switch gear 1 for the first three circuits is provided with a bushing 21.
And is connected to an external system power supply 12. The switch gears 2 and 3 for the second and third circuits, each of the three-phase one-side load-side conductors 9 penetrate the bushing 21 and are connected to the cable head 10. The connection is performed by inserting the load-side conductor 9 into a connector provided on the cable head 10. The load-side conductor 9 in the cable head uses a flexible conductor 22 and is connected to loads such as a transformer TR, other circuits, and a motor. Switchgear 2 for the second three circuits
Each of the phases of the load-side conductor 9 of FIG.
Are connected. The current transformer 13 is also connected to the switch gear 2 for the other three circuits.

The grounding terminals 23 correspond to the nine cable heads, are disposed directly above the cable heads, and are fixed to the common grounding metal fitting 24 by grounding screws 25. Both ends of the common grounding bracket 24 are fixed to the switchboard 16 by grounding screws 25. The cable head 10, the ground terminal 23, and the current transformer 13 can all be seen from the front side to prevent forgetting to attach, and to make the attaching and detaching work easier for the worker, thereby improving work efficiency. Is wearing.

In FIG. 1, the internal bus 8 directly connects the switch gears for three circuits between the switch gears for three circuits. However, in order to easily understand the embodiment, the internal bus 8 connects the switch gears for three circuits. Although they were directly connected, actually 9 in FIG.
A relay terminal plate 27 having a plurality of relay terminals 26 is attached to the inner wall surface of the vacuum vessel, and each of the internal buses 8
Are connected. When each internal bus 8 is arranged on the relay terminal board 27, the switch gears for the first three circuits are sequentially shifted from the left to the right of the relay terminal board 27 from the left to the right.
The internal bus 8 of the switchgear is arranged for three circuits. In the arrangement, the internal bus 8 of the switchgear for each of the three circuits is
One-phase 1X, 2X, 3X with two-phase and three-phase 2X-2 on one side
Z, 3X to 3Z are arranged while being wrapped on the other side to facilitate wiring, and to take measures such as prevention of wiring mistakes and prevention of thermal deterioration by distributed arrangement of internal buses.

Switchgear 1 for first to third three circuits
Are arranged in a vacuum vessel grounded E and have the following configuration. However, since the switch gears 2X to 2Z for each circuit have the same configuration, only the configuration of the switch gear 2X for one circuit will be described. The description of the switchgears 2Y and 2Z for other circuits is omitted. The inside of the vacuum vessel 4 grounded E is provided with a grounding device 6.
The movable electrode 7 which rotates between the fixed electrode 5 and the fixed electrode 5 is disposed, and the cable head 10 is disposed corresponding to the movable electrode 7, and these 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 metal 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 grounding-side conductor 37 extends to the outside through the grounding-side bottom fitting 31, and an end of the grounding conductor 37 is connected to the grounding terminal 23 by a screw. A ground electrode 39 is provided on the ground side conductor 37 on the opposite side.
Is fixed. When the ground electrode 39 is pushed toward the ground-side bottom fitting, the spring 36 also contracts together with the ground-side bellows 35. At this time, the spring 36 always presses the ground electrode 39 in the direction of the movable electrode due to 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 is 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 relay fitting 41 and the fixed support fitting 43 are attached to both ends of the fixed insulating cylinder 42 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 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 the grounding device 6 and the fixed electrode 5
Contact with and away from. For the electrodes 5 to 7, a high melting point metal member containing Cu as a main component, such as a Cr-W-Pb alloy, a Cu-Ni alloy, a Cu-Cr alloy, or a Cu-Ag alloy, is used.

The tip of the movable blade 30 is driven by an operating mechanism (not shown) connected thereto, so that the movable blade 30 rotates about the main shaft 49 as a fulcrum. 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 interrupting the current.

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 the load side bushing 21A made of a ceramic material. A load-side sealing member 53 is provided at the end of the load-side bushing 21A, and the load-side sealing member 53 is supported by being welded to a brazing material around an opening opened in the vacuum container 4 and is exposed inside the vacuum container 4. The ceramic surface of the load side bushing 21A is provided with a ground metal layer 54, and the leakage current flows through the vacuum vessel 4 to the ground E.
And safety measures are taken so that no danger arises even if an operator touches the cable head 10.

Next, the operation of the switchgear for one circuit will be described with reference to FIGS. As shown in FIG. 6, the movable electrode 7 is moved from the position shown in FIG. 6 by moving the movable electrode 7 in the direction of the arrow X1 by the cutoff position Y2 and the disconnection position Y3 arranged between the grounding device 6 and the fixed electrode 5. The movable electrode 7 is in a so-called ground position Y4 where the movable electrode 7 contacts the ground electrode 39, and the ground electrode 39 is always pressed by the spring 36 in the direction of the movable electrode. The movable electrode 7 rotates from the ground position Y4 in the arrow direction X2 as shown in FIG. 8, so that the movable electrode 7 is in contact with the fixed electrode 5 and is also connected to the load-side conductor 9 in a so-called closing position Y.
It is one.

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, the power is always supplied to the load at the so-called input position Y1, the operation time is longer than the use time at other positions, and if the flexible conductor 22 is not used, the movable electrode 7 is directly loaded. Sliding on the side conductor 9 is conceivable. This means that the movable electrode 7 slides directly on the load-side conductor 9 and current continues to flow while the movable electrode 7 and the load-side conductor 9 are in contact with each other. May be welded. As a result, in order to separate the welded movable electrode 7 and the load-side conductor 9 from each other, if the rotating force of the operating mechanism is increased, the operating mechanism can be used at a minimum, but an increase in the size of the operating mechanism cannot be avoided. Instead, the vacuum circuit breaker becomes large and expensive.

Further, sliding during the generated heat causes severe wear, and the life of both electrodes is short. Further, when the movable electrode 7 slides on the load-side conductor 9, the fine metal particles generated from the movable electrode 7 and the load-side conductor 9 evaporate by an electric current to become a metal vapor, which is diffused in the vacuum vessel. After that, it remains between the two electrodes, so that the insulation recovery is delayed and the current interrupting characteristics are deteriorated.

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 power 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 that described above. It is longer and economically advantageous. The flexible conductor 22 connects between the load-side conductor 9 and the movable electrode 7, and does not generate metal vapor when the movable electrode 7 slides on the load-side conductor 9 as described above. It is clear that the cutoff characteristics are significantly improved as compared with the above, and the vacuum container 4 can be downsized accordingly. Further, since the present invention can be used even if the grounding device and the disconnection position are removed, the vacuum vessel and the operating mechanism can be further reduced in size, so that the switch gear for one circuit can of course be reduced in size.

Further, 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 a grounded vacuum vessel. 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. Ground movable electrode 5 supported by vacuum vessel 4
9 and the movable electrode 7 are a ground contact 57 and a load contact 58
It is arranged corresponding to. The movable electrode 7 is the load-side contact 5
8, the movable electrode 7 is connected to the ground contact 57.
Are apart from each other, and operate in opposite directions. Outside the two electrodes, there is a flexible conductor 22 between the fixed electrode 5 and the ground-side conductor 37 connected to the internal buses 8 of a plurality of phases and the two electrodes.
Connected by

That is, when the movable electrode 7 and the load-side contact 58 are in contact with each other, the movable electrode 7 is moved upward from the load-side contact 58, and at the same time, the ground movable electrode 59 is moved downward and the ground-side contact 57 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 internal bus 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 a lateral direction, and between the fixed electrode 5 and the movable electrode 7 and to the ground. Movable electrode 5
It can also be used as a switchgear for one circuit in which the flexible conductor 22 connects between the contact 9 and the ground contact 57. In addition, the fixed electrode 5 and the movable electrode 7 are connected by the flexible conductor 22 and can be used as a switchgear for one circuit.

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 and the movable electrode come and go, and a ground switch. It can also be used as a stand-alone product such as a switch. Further, in addition to the above, the present invention can be applied to an insulating switch using an insulating medium such as SF ₆ gas.

[0043]

As described above, according to the switchgear of the present invention, power is supplied from the movable electrode to the load-side conductor via the fixed electrode and the flexible conductor. As a result, 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 the gear be reduced in size, but also the current interruption characteristics are improved, so that the vacuum vessel can be further reduced in size. Furthermore, it can also be used for a switchgear for one circuit from which the grounding device has been removed, and the vacuum container and the operating mechanism can be reduced in size by removing the grounding device, so that the switchgear for one circuit can be naturally reduced in size. Not even.

[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 used in FIG.

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. 3 as viewed from the left side.

FIG. 5 is a plan view of the bus connection terminal block shown in FIGS. 1 to 4;

6 is a side sectional view showing a configuration of a switchgear for a circuit shown in FIG. 3 in a cut-off and disconnection state.

FIG. 7 is a side sectional view showing a grounded state of the switchgear for the circuit of FIG. 6;

8 is a side sectional view showing a closed state of the switchgear for the circuit of FIG. 6;

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

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

[Explanation of symbols]

1 to 3 switch gears for 3 circuits, 2X to 2Y switch gears for circuits, 4 vacuum chambers, 5 fixed electrodes, 6 grounding devices, 7 movable electrodes, 8 internal buses, 9 load-side conductors, 1
Reference numeral 1 denotes a power supply side bus, 22 denotes a flexible conductor, and 30 denotes a movable blade.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuzo Shibata 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant of Hitachi, Ltd.

Claims (11)

[Claims] 1. A grounding device disposed in a grounded vacuum vessel, a fixed electrode connected to a load-side conductor and a bus of a plurality of phases, and a movable electrode which comes into contact with and separates from the fixed electrode and the grounding device via a main shaft. Wherein the movable electrode and the load-side conductor are connected by a flexible conductor. 2. The switchgear according to claim 1, wherein the movable electrode has a cut-off position and a disconnection position while moving from the input position of the fixed electrode to the grounding position of the grounding device. 3. A fixed electrode connected to a load-side conductor and a bus of a plurality of phases disposed in a grounded vacuum vessel, and a movable electrode which comes into contact with and separates from the fixed electrode via a main shaft. A switchgear wherein a flexible conductor is connected to a load side conductor. 4. A fixed electrode connected to a load-side conductor and a multi-phase bus arranged in a grounded vacuum vessel, and a movable electrode that moves linearly to and away from the load-side conductor. A switchgear, wherein a fixed conductor and a movable electrode arranged in a direction orthogonal to the movable electrode are connected by a flexible conductor. 5. The switchgear according to claim 1, wherein the movable electrode and the load-side conductor arranged between the vacuum vessel ground conductor and the fixed electrode are arranged in a cross shape. 6. A grounding contact, a load-side contact attached to a load-side common conductor disposed in a grounded vacuum vessel, and a movable-side ground electrode and a movable electrode that come into contact with and separate from both contacts.
A switchgear, wherein the movable-side ground electrode and the movable electrode are connected to the ground conductor and a fixed electrode connected to the multi-phase bus via a flexible conductor. 7. The switchgear according to claim 1, wherein most of the vacuum container is made of a stainless steel member. 8. The switchgear according to claim 1, wherein a ceramic member bushing is used for an entrance and an exit of said vacuum vessel. 9. The switchgear according to claim 1, wherein a refractory metal member is used for said electrode. 10. A fixed electrode connected to a load-side conductor disposed in a grounded vacuum vessel and a bus of a plurality of phases, and a movable electrode which comes into contact with and separates from the fixed electrode. A switchgear comprising at least one of a circuit breaker, a disconnector, a load switch, and a grounding device connected to each other by a flexible conductor. 11. A fixed electrode connected to a load-side conductor and a bus of a plurality of phases disposed in a grounded container having an insulating medium, and a movable electrode which comes into contact with and separates from the fixed electrode. A switchgear wherein a flexible conductor is connected to a load side conductor.