JPH11113116A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a switchgear which uses a switchboard of the same size, even if the capacity of a breaker is increased. SOLUTION: A switchboard containing a phase switchgear, which is provided with a fixed electrode 5 arranged inside a vacuum ground container, a ground electrode 6, moving electrode 7 arranged between the two electrodes, a main shaft which makes the moving electrode 7 contact or disconnect from the two electrodes via a fulcrum connected to the moving electrode 7, and a load side conductor 9 supported with the vacuum ground container electrically connected to the moving electrode 7, and the vacuum ground container, in which this phase switchgear is arranged for three phases, is identical in size as a conventional switchgear of a rated voltage of 6 kV, even when used for a rated voltage of 24 kV.

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 novel switchgear in which at least one of a circuit breaker, a disconnector, a load switch, and a grounding device is assembled.

[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 individually 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 rotated left and right with the main shaft as a fulcrum, and comes into contact with and separates from the fixed electrode, thereby closing and closing.

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 the gas circuit breaker is turned off, the disconnecting switch provided separately from the gas circuit breaker is opened, and the grounding switch is grounded, so that the residual charge and the induced current on the power supply side flow to the ground, and the power supply from the power supply is restored. The application of voltage is prevented to protect the worker's safety. Also,
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 in the vacuum vessel moves up and down with respect to the fixed electrode by the operating device, and is turned on and off.
The vacuum circuit breaker described in 55-143727 publication has a movable lead wire corresponding to a movable blade and a movable electrode in a vacuum vessel pivoting left and right with a main shaft as a fulcrum, and comes into contact with and separates from a fixed electrode. It is turned on and off.

However, in these publications, especially in the former publication, the cable head, the grounding device, and the operating device are provided on the back surface of the switchboard, so that the switchboard cannot be avoided from being enlarged, and the capacity of the circuit breaker increases. If the size of the switchboard is unavoidable, the number of switchboard types will increase.

An object of the present invention is to provide a switchgear that can use a switchboard of the same size even when the capacity of a circuit breaker increases.

[0007]

According to a first aspect of the present invention, there is provided a switchgear comprising: a switchboard having an interrupting section compartment and an operating section compartment; a vacuum earthing container housed in the interrupting section compartment; A fixed electrode and a ground electrode disposed, a movable electrode disposed between the two electrodes, a movable blade that contacts and separates the movable electrode between the two electrodes via a fulcrum connected to the movable electrode, and a movable electrode electrically connected to the movable electrode. A phase switchgear having a load-side conductor supported by a connected vacuum grounding container, and a switchboard containing three phases of the phase switchgear in a vacuum grounding container and storing the vacuum grounding container in a cut-off compartment. And rated voltage 24K
V, a rated current of 600 A and a rated breaking capacity of 25 KA, a three-phase switchgear having a width of 1100 mm and a height of 150 mm.
It is intended to be used for a switchboard of 0 mm and depth of 450 mm.

A switchgear according to a second aspect of the present invention is to provide a current blocking means on a part of the movable electrode and the blade.

In a third aspect of the present invention, the switch gear has a disconnection position while the movable electrode moves from the closing position to the ground position.

A switchgear according to a fourth aspect of the present invention is to use a flexible conductor for the electric means.

According to a fifth aspect of the present invention, there is provided a switchgear provided with an operation section compartment and support means above and below the shutoff section compartment.

A switchgear according to a sixth aspect of the present invention is used for a switchgear in which one or more of a circuit breaker, a disconnector, a load switch, and a grounding device are assembled.

A switchgear according to a seventh aspect of the present invention is to use a closed container having an insulating medium instead of the vacuum grounding container.

According to a eighth aspect of the present invention, there is provided a switchgear comprising: a ground-side fixed electrode and a movable-side fixed electrode disposed in a vacuum grounding container; and a ground-side movable electrode and a movable electrode which are in contact with and separate from each of the two electrodes. It is another object of the present invention to provide a vacuum grounding container that is disposed so that the volume in the movable electrode side vacuum grounding container from the center between the two electrodes is larger than the volume in the ground electrode side vacuum grounding container.

According to a ninth aspect of the present invention, in the switchgear, distances from the center between the two electrodes to the inner surface of the movable electrode side vacuum grounding container and the center to the inner surface of the grounding electrode side vacuum grounding container are L1 and L.
If it is set to 2, the vacuum grounding container is configured so that L1> L2.

[0016]

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 of one circuit of FIG. 1, and the circuit switchgear of one circuit of FIG. Figure 3 shows the structure of
FIG. FIG. 5 shows a relay terminal plate 27 for connecting each phase of the circuit switchgear with a bus.

The switch gears 1, 2 and 3 for three circuits, for example, three phases, are arranged in a vacuum grounded container 4 which is grounded. Since the three circuit switchgears 1, 2, and 3 have the same configuration, the second circuit switchgear 2 will be described, and the description of the other circuit switchgears will be omitted. The circuit switchgear 2 is a set of three phases of phase switchgears 2X, 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 ground electrode 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 grounding container. 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 ground electrode 6, FIG.
Stop at 4 positions.

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 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.
The movable electrode 7 contacts the ground electrode 6 at the ground 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 perform four positions in one operation while rotating from the fixed electrode 5 to the ground electrode 6 in a vacuum that is a high insulator, the operation is easy and the usability is good. In addition, since the movable electrode 7, the fixed electrode 5, and the ground electrode 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 two-line power reception having two system power supplies, the phase switch gear 2X of one of the lines is operating at the closing position Y1, and the phase switch gear 2Y of the other line is in operation. When the operator is in standby at the disconnection position Y3, it is not only safe for the worker to come into contact with the load-side conductor 9, but also the operation can be continuously performed when switching from standby to operation or from operation to standby. Fast speed and easy operation.

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 grounded vacuum grounding container 4 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 grounding container 4 or to improve the vacuum grounding container wall. The thickness is reduced to reduce the weight. The vacuum grounding container 4 is housed in a switchboard 16. Switchboard 1
6 is provided with an operation section compartment 17 and a conductor compartment 18 on the upper and lower sides of the vacuum grounding container 4. The operation section compartment 17 is disposed so as to be recessed on the right side, that is, the depth side of the vacuum grounding container 4, and has a door 19 that can be opened and closed on the front side. Also conductor compartment 1
Reference numeral 8 is arranged on the left side of the vacuum grounding container 4, that is, on the near side.

The operation section compartment 17 and the conductor compartment 18 are disposed obliquely symmetrically via the vacuum grounding container 4. The operation section compartment 17 houses an operation mechanism section 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 maintaining and inspecting the inside of the operation section compartment can be placed on the vacuum container on the front side of the operation section compartment 17, and maintenance and inspection are easy. The conductor compartment 18 is disposed on the front side before the operation section compartment 17 so that the cable head 10 can be safely mounted.

Nine bushings 21 are mounted on the front wall of the vacuum grounding container. 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 the second and third three-circuit switch gears 2 and 3 as well, the one-side load-side conductor 9 of each of the three phases passes through the bushing 21 and is 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. Each phase of the cable head 10 of the second circuit switchgear 2 is provided with a current transformer 13 as shown in FIG. A current transformer 13 connected to another circuit switchgear 2 is also provided as necessary, such as load conditions.

The ground electrodes 6 correspond to the nine cable heads 10 and are disposed above the cable heads 10, and connect the common ground conductor 24 to the common ground conductor 24. Both ends of the common ground conductor 24 are fixed to the switchboard 16 by ground screws 25. These cable head 10, ground cable 38, current transformer 1
3 can be viewed from the front side to prevent forgetting to attach, and to make the attaching and detaching work easier for the operator, thereby improving work efficiency.

In FIG. 1, the internal bus 8 directly connects the circuit switch gears between the three circuit switch gears, but this is because the circuit switch gears are directly connected for easy understanding of the embodiment. . 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. When arranging, the internal bus 8 of each circuit switchgear is arranged while wrapping the one-phase 1X, 2X, 3X on one side while wrapping the two-phase and three-phase 2X-2Z, 3X-3Z on the other side. In addition, measures such as prevention of thermal deterioration and the like are provided by simplifying the wiring and preventing the wiring errors and distributing the internal buses.

First to third circuit switch gears 1 to 3
Are arranged in a vacuum grounded container and have the following configuration. However, since the respective 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 switch gears 2Y and 2Z is omitted. A movable electrode 7 that rotates between a ground electrode 6 and a fixed electrode 5 corresponding to the ground electrode 6 is disposed inside the vacuum ground container 4, and a cable head 10 is arranged corresponding to the movable electrode 7. They are arranged in a cross shape as a whole. The ground electrode 6, the movable blade 30, and the load-side conductor 9 that pass through three through holes (not shown) formed in the vacuum grounding container 4 extend outside the vacuum grounding container.

The ground electrode 6 has a ground-side bottom metal fitting 31 at one end, a ground-side bushing 32 made of a ceramic material having an open end at the other end, and a flange 33 provided around the outer periphery of the ground-side bushing 32. The ground-side sealing fitting 34 attached to 33 is welded to the vacuum grounding 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 grounding-side cable 38 is formed of a flexible conductor, and can be electrically connected even when the grounding-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 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. Although the ground conductor 37 and the ground electrode 39 are distinguished from each other, they may be integrally referred to as a ground electrode.

The fixed electrode 5 corresponding to the ground electrode 6 is connected to the three-phase internal bus 8. 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 member 43 supporting the other end of the fixed insulating cylinder 42 is fixed to the vacuum grounding container by 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 ground electrode 6 and the fixed electrode 5. 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 a
It is fixed to. 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 has a main shaft 4
It rotates in the direction of the arrow with 9 as a fulcrum, and comes into contact with and separates from the ground electrode 39 and the fixed electrode 5. The electrodes 5 to 7 are made of an alloy containing Cu as a main component and other Cr-W-Pb, Cu-C
A high melting point metal member such as an r alloy, a Cu-Ag alloy, or a Cu-Ni 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 welded to a brazing material around an opening provided in the vacuum grounding container 4 to be supported. The ground surface metal layer 54 is provided on the ceramic surface of the load side bushing 21A which is exposed to the outside, so that leakage current flows to the ground E via the vacuum grounding container 4, and there is a danger even if an operator comes into contact with the cable head 10. Safety measures are taken to prevent this from happening.

Next, the operation of the phase switch gear will be described with reference to FIGS. The movable electrode 7 is disposed between the ground electrode 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 arrow direction X1 as shown in FIG. 6, and the movable electrode 7 is in contact with the ground electrode 39, that is, the so-called ground position Y4. It is pressed by a spring 36 in the electrode direction.
The movable electrode 7 is moved from the ground position Y4 in the arrow direction X as shown in FIG.
2, the movable electrode 7 is in contact with the fixed electrode 5 and is also connected to the load-side conductor 9, which is a so-called closing position Y1.

At the input position Y1, the movable electrode 7 is
And is also 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 use time at other positions, and if the flexible conductor 22 is not used, the movable electrode 7 is directly connected to the load. Sliding on the conductor 9 is conceivable. This means that the movable electrode 7 slides directly on the load-side conductor 9,
The current continues to flow while the movable electrode 7 and the load-side conductor 9 are in contact with each other, and the generated heat may cause the movable electrode 7 and the load-side conductor 9 to be welded. As a result,
Since the welded movable electrode 7 and the load-side conductor 9 are separated from each other, the rotating force of the operating mechanism increases, and the operating mechanism cannot be increased in size, and the vacuum circuit breaker is increased in size and cost. Get high.

In addition, sliding during the generation of heat causes severe wear and shortens the life of both electrodes. 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 the dielectric breakdown easily occurs.

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 at the shortest distance, and as described above, the movable electrode 7 may generate metal vapor when sliding on the load-side conductor 9. However, it is clear that the current interruption characteristics are significantly improved as compared with the above, and the vacuum grounding container 4 can be downsized accordingly.

As described above, according to the present invention, the fixed electrode 5 and the ground electrode 6 disposed in the vacuum ground container, the movable electrode 7 disposed between the two electrodes, and the movable electrode 7 via the fulcrum connected to the movable electrode 7 are provided. A movable blade 30 for bringing an electrode into and out of contact between both electrodes
And a phase switchgear including a load-side conductor 9 supported by a vacuum grounding vessel electrically connected to the movable electrode 7, and the performance of storing three phases of the phase switchgear in the vacuum grounding vessel is as follows: A switchboard having a rated voltage of 24 KV, a rated current of 600 A, and a rated breaking capacity of 25 KA. A switchboard in which this vacuum grounding container is housed in a breaking section compartment has a width of 1100 mm and a height of 1 mm.
Used for a switchboard of 500mm and depth of 450mm. This is the same size as the field switchboard of a distribution substation with a rated voltage of 6 KV, which conventionally used three independent vacuum circuit breakers. In other words, the vacuum circuit breaker of the conventional rated voltage of 6 KV can be used for the same switchboard even if the rated voltage of the three-phase switchgear of the present invention is increased by 24 KV, so that there is compatibility.

Further, since the present invention can be used even if the grounding device and the disconnecting position are removed, the vacuum grounding vessel and the operating mechanism can be further downsized, so that the circuit switchgear can of course be downsized.

Further, the volume 5C of the fixed-electrode-side vacuum grounding container from the center of the movable electrode 7 located at the center between the grounding electrode 6 and the fixed electrode 5 is made larger than the volume 6C of the grounding-electrode-side vacuum grounding container. In order to make the volume 5C larger than the volume 6C, distances from the center 0 of the movable electrode 7 located at the center between the ground electrode 39 and the fixed electrode 5 to the vacuum ground containers on the fixed electrode side and the ground electrode side are L1 and L2. Then, the vacuum grounding container 4 may be configured so that L1> L2.

As a result, when the movable electrode 7 comes into contact with or separates from the ground electrode 6 or the fixed electrode 5, the ground electrode 6 only flows the residual charge on the power supply side and the induced current to the ground. Since the ground electrode 6 is much smaller than the ground electrode 6, the volume 6C may be smaller than the volume 5C. Since more metal fine particles from the electrodes 5 and 7 are generated than the ground electrode 6, the volume 5C is made wider than the volume 6C, and most of the metal vapor diffuses in the volume 5C, thereby reducing the residual ions and reducing the current. The breaking performance can be improved, and the switchgear can of course be downsized accordingly. Next, another embodiment will be described with reference to FIGS. A load-side common conductor 56 is mounted in the vacuum grounding container, and the load-side common conductor 56 is connected to the load-side conductor 9 and has a ground-side contact 57 thereon.
And the load side contact 58 is attached. A part of the ground-side conductor 37 connected to the load-side conductor 9 and the ground electrode 39 is provided on the front side of the switchboard, so that the same effect as described above can be achieved. When the movable electrode 7 and the load-side contact 57 are in contact with each other, the load-side contact 58
Is moved upward, and at the same time, the ground movable electrode 59 moves downward to come into contact with the ground contact 58 to be in the ground state. 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. Electrode 5
It can also be used for a one-circuit switchgear in which the flexible conductor 22 connects the contact 9 and the ground contact 58. In addition, the fixed electrode 5 and the movable electrode 7 are connected by the flexible conductor 22 and can be used as a one-circuit switch gear.

A central portion 0 is provided between the movable electrode 7 and the ground movable electrode 59 in the vacuum grounding vessel, and the central portion 0 and the movable electrode 7
The distance between the side, the ground movable electrode 59 side and the inner surface of the vacuum grounding container is L1 and L2. The volumes in the right and left vacuum grounded containers via the center portion 0 are denoted by C5 and C6. The relationship between these L1 and L2 and C5 and C6 is L1>
L2 and C5> C6, and the same effect as described above can be achieved.

In addition to the above, the circuit switchgear of the present invention may be a circuit breaker in which the movable electrode opens and closes to 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.

[0045]

As described above, according to the switchgear of the present invention, electric 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 can be 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 grounding container can be further reduced in size. This can also be used for a switchgear for one circuit from which the grounding device has been removed, and the vacuum vessel and the operating mechanism can be reduced in size by removing the grounding device. Fixed electrode 5 and ground electrode 6 disposed on the movable electrode 7 and movable electrode 7 disposed between the electrodes.
And a main shaft for moving the movable electrode between the two electrodes via a fulcrum connected to the movable electrode 7, and a load-side conductor 9 supported by a vacuum grounded vessel electrically connected to the movable electrode 7. The switchgear and the three phases of the phase switchgear are housed in a vacuum grounded container, and have a performance of a rated voltage of 24 KV and a rated current of 6
00A, rated breaking capacity 25 KA, and a switchboard containing this vacuum grounded container in the breaking section compartment has a width of 1
Used for a switchboard of 100mm, height 1500mm and depth 450mm. This is the same size as the field switchboard of a distribution substation with a rated voltage of 6 KV, which conventionally used three independent vacuum circuit breakers. In other words, in contrast to the conventional vacuum circuit breaker with a rated voltage of 6 KV, even if the rated voltage of the three-phase switchgear of the present invention is increased by 24 KV, it can be used on the same switchboard.
Compatible.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view showing a configuration of a switchgear for one circuit used in FIG. 1;

FIG. 3 is a front view of FIG. 2 as viewed from the left side.

FIG. 4 is a plan view of the bus connection terminal block shown in FIGS. 1 and 3;

FIG. 5 is a side sectional view showing the configuration of the circuit switchgear shown in FIGS. 1 and 2;

6 is a side sectional view of the circuit switchgear shown in FIG. 3 in a no-load state.

FIG. 7 is a side sectional view showing a grounded state of the circuit switchgear of FIG. 3;

FIG. 8 is a side sectional view showing a closed state of the circuit switchgear of FIG. 3;

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 to 3 switch gears for 3 circuits, 2X to 2Z phase switch gears, 4 ground vacuum containers, 5 fixed electrodes, 6 ground electrodes, 7 movable electrodes, 8 internal buses, 9 load-side conductors, 1
DESCRIPTION OF SYMBOLS 1 ... Power supply side cable, 16A ... Interruption part compartment, 17 ... Operation part compartment, 18 ... Conductor compartment, 22 ... Flexible conductor, 30 ... Movable blade.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Ayumu Morita 7-2-1, Omika-cho, Hitachi City, Ibaraki Pref.

Claims (9)

[Claims] A switchboard having a cut-off section compartment and an operation section compartment, a vacuum ground container accommodated in the cut-off section compartment, a fixed electrode and a ground electrode disposed in the vacuum ground container, and disposed between the two electrodes. A movable electrode, a movable blade for moving the movable electrode between the two electrodes via a fulcrum connected to the movable electrode, and a load-side conductor supported by a vacuum grounding vessel electrically connected to the movable electrode. A phase switchgear, and a switchboard in which three phases of the phase switchgear are housed in a vacuum earthed container, and the vacuum earthed container is housed in a cut-off compartment, and has a rated voltage of 24K.
V, rated current 600A, rated breaking capacity 25KA, three-phase switchgear, width 1100mm, height 1500m
Switchgear characterized in that it is used for switchboards of m and 450mm depth. 2. The switch gear according to claim 1, wherein a current blocking means is provided on a part of said movable electrode and said movable blade. 3. A disconnecting position while the movable electrode moves from a closing position to a grounding position.
The described switchgear. 4. The switchgear according to claim 1, wherein a flexible conductor is used for said electric means. 5. The switchgear according to claim 1, wherein an operation section compartment and support means are provided above and below said blocking section compartment. 6. The switchgear according to claim 1, wherein at least one of a circuit breaker, a disconnector, a load switch, and a grounding device is used as a switchgear. 7. The switchgear according to claim 1, wherein a closed container having an insulating medium is used instead of the vacuum grounding container. 8. A ground-side fixed electrode and a movable-side fixed electrode arranged in a vacuum grounding container, and a ground-side movable electrode and a movable electrode that are in contact with and separated from each of the two electrodes, and are arranged from the center between the two electrodes. 2. The switchgear according to claim 1, wherein the vacuum grounding container is configured such that the volume in the movable electrode side vacuum grounding container is larger than the volume in the grounding electrode side vacuum grounding container. 9. If the distances from the center between the two electrodes to the inner surface of the movable electrode side vacuum grounding container and the center to the inner surface of the grounding electrode side vacuum grounding container are L1 and L2, the vacuum grounding container is set so that L1> L2. The switchgear according to claim 1, wherein the switchgear is configured.