JPH11113118A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a current path substantially and to decrease the electric resistance, by supplying power to a load side from a movable electrode through a fixed electrode and a flexible conductor. SOLUTION: A fixed electrode 5 is connected to a power-side conductor 8 through a connecting conductor 8A made of a flexible conductor, and a movable electrode 7 is connected to a load-side conductor (a cable head 10 outside a vacuum container) through a flexible conductor 34. And the movable electrode 7 is united to a movable blade 11 mechanically, and rotates and moves in the upward, downward, right and left directions by the rotation of the movable blade 11. Namely, the movable electrode 7 stops at either one of a make position, a break position, a disconnection position, and a grounding position, when it moves from the position of the fixed electrode 5 up to a grounding electrode 6. At the making position, the movable electrode 7 touches the fixed electrode 5, and is connected to the load-side conductor 9 as well. On this occasion, power is supplied through the flexible conductor 34 without passing the movable blade 11. Accordingly, it becomes possible to shorten the current path substantially, and to suppress the power loss and heat generation to an extent corresponding to the reduction of its electric resistance.

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 the formation of equipment. For this reason, it is necessary to reduce the size of the 22KV distribution equipment to about 6KV.

[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 separately 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.
In the vacuum circuit breaker described in Japanese Patent Publication No. 143727, the movable electrode is rotated left and right about the main shaft so as to be in contact with and separated from the fixed electrode, and is turned on and off.

[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 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.

[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. doing. When a vacuum circuit breaker is used as a circuit breaker, a movable electrode in a vacuum vessel is moved up and down with respect to a fixed electrode by an operating device to make and break a circuit, or described in Japanese Patent Application Laid-Open No. 55-143727. In this vacuum circuit breaker, a movable lead wire corresponding to a movable blade and a movable electrode in a vacuum vessel are rotated left and right with a main shaft as a fulcrum, and come into contact with and separate from a fixed electrode, thereby closing and closing. . Further, JP-A-59-75527
A rod extends from the back surface of the movable electrode and the fixed electrode in the vacuum container described in Japanese Patent Application Laid-Open Publication No. H11-139,073 to the outside of the vacuum container.

However, in each of these publications, a rod extends from the back of the movable electrode and the fixed electrode to the outside of the vacuum vessel, and a power supply side conductor and a load side conductor are connected to the rod.
The electrical system connected from these conductors to the power supply-side bus and the cable head becomes longer. Further, the electric system is determined by a rod from the back of the movable electrode and the fixed electrode to the outside of the vacuum vessel, and the degree of design freedom is lacking.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a switchgear in which an electric system from a back surface of a movable electrode and a fixed electrode in a vacuum vessel to a power supply side conductor and a load side conductor extending to the outside of the vacuum vessel is shortened to reduce heat generated by the electric power. Is to provide.

Another object of the present invention is to provide a switchgear capable of securing a so-called design freedom in which a power-supply-side conductor and a load-side conductor extending outside a vacuum vessel are provided at positions different from those of a movable electrode and a fixed electrode. Is to do.

[0009]

According to a first aspect of the present invention, there is provided a switchgear comprising a fixed electrode, a ground electrode and a load-side conductor disposed in a vacuum grounded container, and a movable electrode which comes into contact with and separates from the fixed electrode and the ground electrode. And a movable blade provided on a vacuum grounding vessel for moving the movable electrode between the two electrodes via a fulcrum connected to the movable electrode, and fixed to a power supply side conductor connected to an external conductor from inside the vacuum grounding vessel. The electrodes may be connected to each other by electrical means.

According to a second aspect of the present invention, there is provided a switchgear comprising a fixed electrode, a ground electrode and a load-side conductor disposed on one side and the other side in a longitudinal direction in a vacuum grounded vessel, and a contact between the fixed electrode and the ground electrode. A movable electrode that is separated and connected to the load-side conductor by electrical means, and is provided in a direction orthogonal to the longitudinal direction of the vacuum grounding container that moves and moves the movable electrode between the two electrodes via a fulcrum connected to the movable electrode. And a movable blade.

The switchgear according to a third aspect of the present invention is that the fixed electrode and the power supply side conductor are connected by a connection conductor, and the fixed electrodes of the switchgear of each phase are arranged at the same position.

According to a fourth aspect of the present invention, there is provided a switchgear in which the power supply-side conductor extending outside the vacuum grounding vessel of each phase and the power supply bus of each phase are connected at different positions at the connection portions of the switchgears of the respective phases. It is in.

According to a fifth aspect of the present invention, there is provided a switchgear of each phase to which a power supply-side conductor extending out of the vacuum grounding vessel of each phase and a power supply bus extending along the longitudinal direction of the vacuum grounding vessel are connected. It is to arrange a connection part in the same place.

According to a sixth aspect of the present invention, there is provided a switch gear for vacuum-insulating a power supply bus.

A switchgear according to a seventh aspect of the present invention is that a current blocking means is provided on a part of the movable electrode, the movable blade and the fixed electrode which are connected to the load-side conductor by electric means.

In the switchgear according to the present invention, the movable electrode has the disconnection position while moving from the closing position to the grounding position.

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

According to a tenth aspect of the present invention, there is provided a switchgear comprising: a fixed electrode, a ground electrode and a load-side conductor in a vacuum grounded container;
The two electrodes and the movable electrode that comes in contact with and separated from each other are arranged, and the vacuum ground container is configured such that the volume of one side of one side in the vacuum ground container is larger than the volume of the other side from the central movable electrode between the two electrodes. It is in.

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

[0020]

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 a block skeleton in which phase-separated ground vacuum switchgears are assembled. FIG. 2 shows an electric circuit adapted to the structure of the phase-separated ground vacuum switchgear for one phase in FIG. FIGS. 3 and 4 are top views of the phase-separated ground vacuum switchgear and the vacuum bus for the three phases shown in FIG. 1. FIG. The structure is shown in FIGS.
It was shown to. The connection structure of the vacuum bus is shown in FIGS.

The switchboard 100 shown in FIG.
A power-supply-side compartment 102 and a conductor compartment 103 are provided above and below the cut-off section compartment 101 that houses the power supply. Power supply side compartment 1
The vacuum bus 12 disposed inside the vacuum switch 02 is connected to three phase-separated ground type vacuum switch gears 1, 2, and 3 (hereinafter, referred to as a vacuum switch gear) inside the vacuum ground container 4 in the cut-off section compartment 101, and a vacuum is provided. The switchgear 2 is connected to the load-side conductor 9 and the cable head 10 in the conductor compartment 103.

That is, the vacuum grounding container 4 is grounded E, and three-phase vacuum switchgears 1, 2, and 3 are disposed inside the container. Since the vacuum switch gears 1 to 3 of each phase have the same configuration, the vacuum switch gear 2 will be described, and the description of the other vacuum switch gears will be omitted. The vacuum switchgear 2 is formed by integrally integrating a shutoff function, a disconnection function, a grounding function, and a bus. That is, the vacuum switch gear 2 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 power supply side conductor 8 via a connection conductor 8A made of a flexible conductor. The movable electrode 7 is connected to the load-side conductor 9 via the flexible conductor 34.
, And the load-side conductor 9 is connected to a cable head 10 outside the vacuum grounding vessel. The movable electrode 7 is mechanically connected to a movable blade 11 to be described later, and rotates vertically or horizontally by the rotation of the movable blade 11 driven by the operation mechanism 31. When the movable electrode 7 moves from the fixed electrode 5 to the ground electrode 6, it stops at the four positions in FIG.

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. Four positions can be continuously performed by one operation while the movable electrode 7 rotates from the fixed electrode 5 to the ground electrode 6 in a vacuum, which is 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 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, by detecting the energized current by the current transformer 13 and operating the protection relay 14 to trip the operation mechanism (not shown), it is possible to cope with a system failure.

The vacuum grounded container 4 which is grounded E uses a stainless steel member, and has a rectangular cross section in which one side (depth portion, longitudinal direction) 4A is longer than the other side (high portion) 4B,
The width portion 4C is formed into a curved shape as shown in FIG. 3 to increase the mechanical strength of the vacuum grounding container 4 and to reduce the thickness of the vacuum grounding container wall to reduce the weight. Vacuum buses 12 of each phase extend in a direction perpendicular to one side (depth portion) 4A of each phase vacuum switch gear 1, 2, 3. An operating chamber 104 for driving the movable blade 11 is disposed at one end of the width portion 4C of the vacuum switch gears 1, 2, 3 of each phase.

The insides of the vacuum grounding vessels of the vacuum switch gears 1 to 3 have the following configuration. However, since the vacuum switch gears 1 to 3 of each phase have the same configuration, the vacuum switch gear 2 for one phase is used. Only the configuration of the other vacuum switchgears 2, 3
Is omitted. The inside of the vacuum grounding container 4 has a fixed electrode 5 and a ground electrode 6 on one side 4A, that is, on the upper side and the lower side of the depth.
In addition to the arrangement of the load-side conductor 9, the size of the other side 4B, that is, the height of the vacuum grounding container 4 can be reduced, and the flexible conductor 34 can move the movable electrode 7 to the load-side conductor 9 and the cable head 10. Can be greatly reduced as compared with the above-described conventional technology, so that the electric resistance is reduced, the generated heat is reduced, and the size of the vacuum switchgear 1 can be reduced. The fixed electrode 5 and the ground electrode 6 are arranged corresponding to each other, and the movable electrode 7 is arranged between the fixed electrode 5 and the ground electrode 6. The movable electrode 7 rotates between the two electrodes and comes into contact with and separates from the two electrodes.

The grounding electrode 6 has a grounding-side bottom fitting 15 at one end and a grounding-side bushing 16 made of a ceramic material having an open end at the other end, and is attached to a flange 17 provided on the outer periphery of the grounding-side bushing 16. The ground-side sealing metal fitting 18 is welded to the vacuum grounding container 4 to support the ground electrode 6 on the vacuum grounding container 4. Grounding bellows 1 in grounding bushing
9 and a spring 20 and a ground electrode 6 are arranged. The ground electrode 6 extends to the outside through the ground-side bottom bracket 15, and its end is connected to the ground-side cable 22 with a screw, and the ground-side cable 22 is connected to the switchboard 100.

When the ground electrode 6 on the opposite side is pushed toward the bottom metal fitting on the ground side, the spring 20
At this time, the spring 20 always presses the ground electrode 6 in the direction of the movable electrode due to the contracted force.

The fixed electrode 5 corresponding to the ground electrode 6 is supported by a fixed insulating cylinder 25 made of a ceramic material. The fixed-side sealing metal fitting 26 that supports the other end of the fixed-side insulating cylinder 25 is fixed to the vacuum grounding container 4 with a brazing material. That is, the fixed-side fitting 24 and the fixed sealing fitting 26 are attached to both ends of the fixed-side insulating cylinder 25 in advance. Since the three-phase fixed electrode 5 and the three-phase power supply side conductor 8 are arranged at different locations and are connected by the connection conductor 8A, the fixed electrode 5 can be arranged at the same location, and the fixed electrode 5 is used as a reference. As a position, the power supply-side conductor 8 can be arranged at an arbitrary position, so that not only the degree of freedom of design can be secured, but also the power supply-side conductor 8 can be arranged at a place where assembly is easy. The same can be said for the relationship between the flexible conductor 34 and the load-side conductor 9 described above.

The movable electrode 7 disposed between the ground electrode 6 and the fixed electrode 5 is supported by a movable insulating cylinder 29 made of a ceramic material via a movable metal fitting 28. Movable insulation tube 2
The movable metal fittings 28 are attached to both ends of the movable member 9, and the movable blade 11 and the movable bellows 30 are attached to one of the movable metal fittings 28. The other side of the movable side bellows 30 is attached to the vacuum grounding container 4 and the movable blade 11 is surrounded by the movable movable bellows 30 and extends to the outside through the vacuum grounding container 4. Movable bellows 30
Functions to rotate the movable blade 11 right and left and up and down via a main shaft 11A provided on the movable blade 11. The movable blade 11 rotates with the main shaft 11A as a fulcrum, comes into contact with and separates from the ground electrode 6 and the fixed electrode 5, and electrically enters and turns off.

The tip of the movable blade 30 is driven by an operating mechanism 31 connected thereto, so that the movable blade 11 is moved to the main shaft 11A.
Rotate around the fulcrum. The operating axis 32 is the movable blade 11
And the operating mechanism 31 are connected. The operation mechanism unit 31 is disposed in the operation mechanism room described above. Note that a structure in which only a movable electrode is provided at the tip of the movable blade may be used. In this case, any one of the movable blade and the operation mechanism needs an insulating means for interrupting a current, for example, a movable-side insulating cylinder 29. As compared with the case where no electric current flows through the movable blade and the operation mechanism, there is an advantage that the mechanical strength can be weakened, for example, in consideration of thermal deformation.

The tip of the movable electrode 7 and the load-side conductor 9 are connected by a flexible conductor 34. Load side conductor 9
Are connected to the cable head 10 through a load side bushing 35 made of a ceramic material. A load-side sealing fitting 36 is provided at an end of the load-side bushing 35, and the load-side sealing fitting 36 is welded to a brazing material around an opening formed in the vacuum grounding container 4 to be supported. The ceramic surface of the load side bushing 35 exposed inside is provided with a ground metal layer 37 so that leakage current flows to the ground E via the vacuum ground container 4, and the worker operates the cable head 1.
Safety measures are taken so that danger does not occur even if 0 is touched.

Next, the operation of the vacuum switchgear 1 will be described with reference to FIG. 2 and FIGS. The movable electrode 7 is located at the cut-off position Y2 in FIG. 2 disposed between the ground electrode 6 and the fixed electrode 5 as shown in FIG. 5, and from this position the ground electrode 6 is at the disconnection position Y3. Since the switch DS functions, there is no need to provide the disconnector DS each time, and the vacuum switchgear 1 can be downsized. From this position, the movable electrode 7 is rotated as shown in FIG. 6, and this is a so-called ground position Y4 where the movable electrode 7 contacts the ground electrode 6, and the ground electrode 6 is always pressed by the spring 20 in the direction of the movable electrode. The movable electrode 7 is shown in FIG.
The movable electrode 7 is rotated in the opposite direction from the ground position Y4 as shown in FIG.

At the loading 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 input position Y1 where the fixed electrode 5 and the movable electrode 7 are in contact with each other to the load-side conductor 9 via the flexible conductor 34 without passing through the movable blade 11. Current path can be greatly reduced as compared with that of the prior art, the electric resistance is reduced, and the power loss and generated heat can be reduced correspondingly.

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 34 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 slides directly on 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.
In addition, the load side conductor 9 may be welded. As a result, since the movable electrode 7 and the load-side conductor 9 that have been welded are separated from each other, the rotating power of the operating mechanism 31 increases, and it is inevitable that the operating mechanism 31 becomes larger. 1 increases in size and cost. Also, sliding while heat is being generated 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 is connected between the load-side conductor 9 and the movable electrode 7 by the flexible conductor 34 that does not slide directly on the load-side conductor 9. The welding of the side conductor 9 does not occur, the rotational power of the operation mechanism 31 is not increased as described above, and the operation mechanism 31 can be reduced in size and the movable electrode 7 can be reduced.
In addition, the life of the load-side conductor 9 is longer than that described above, which is economically advantageous. Also, the load-side conductor 9 is
And the movable electrode 7 are connected at the shortest distance, and as described above, the movable electrode 7 does not generate metal vapor when sliding on the load-side conductor 9, and the current interruption characteristics are lower than those described above. Obviously, the improvement is remarkable, and the vacuum grounding container 4 can be downsized accordingly.

As a countermeasure against metal vapor, a fixed electrode 5, a ground electrode 6, a load-side conductor 9, and a movable electrode 7 which comes into contact with and separate from both electrodes are arranged on one side and the other side in a vacuum grounding vessel. The vacuum grounding container is configured such that one side of one side in the vacuum grounding container, that is, the upper side volume C1 from the movable electrode 7 at the center 0 between the electrodes is larger than the other side volume C2. This cuts off, for example, a short-circuit current flowing through the fixed electrode 5, the movable electrode 7, and the load-side conductor 9, whereas the ground electrode 6 only allows residual electric charges on the power supply side and induced current to flow to the ground. Since the generation of metal vapor is smaller than that of the
1> Volume C2, diffusion of metal vapor in volume C1 was facilitated, and insulation recovery was accelerated.

On the other hand, as a result of connecting the fixed electrode 5 and the power-supply-side conductor 8 with the connection conductor 8A, the fixed electrode 5 can be arranged at the same position in each phase. It is possible to arbitrarily determine whether to connect the power supply side conductor 8 and the vacuum bus 12 at the position. That is, the fixed electrode 5
The position where the power supply-side conductor 8 is to be arranged can be easily understood from the reference position, and there is an advantage that the design and manufacture are easy.

For example, as a result of connecting the fixed electrode 5 at the same position and the power supply side conductor 8 at a different position with the connection conductor 8A in each phase,
As shown in FIGS. 3 and 4, a plurality of power conductors 8 on the power supply side and a vacuum bus 12 connected to one side 4A of the vacuum grounding container 4 are arranged in a direction orthogonal to one side of the vacuum grounding container 4. Conductor 8
The connection 40 between the and the vacuum bus 12 is arranged in an inclined manner so that the connection 40 of each phase does not overlap so that the connection operation can be facilitated. In this case, when the vacuum bus bar 12 connected to the power source side conductors of a plurality of phases and one side of the vacuum grounding container extends along one side of the vacuum grounding container, the connecting portion 40 of each phase is connected.
Are arranged in parallel to reduce the movement during the connection work, thereby facilitating the connection work.

Next, the connection between the power supply side conductor 8 and the vacuum bus 12 will be described with reference to FIGS. The inner conductor 8 having one end connected to the connection conductor 8A penetrates the power supply side support portion 41 of the ceramic member and is connected to the power supply side conductor 8 at the connection portion 40.
And the vacuum bus 12 are connected. Sealing fittings 42 and 43 are provided at the front end and midway of the power supply side support portion 41. One sealing fitting 42 is connected to the power supply side conductor 8 and the other sealing fitting 43
Are connected to the peripheral edges of the through holes of the vacuum grounding container 4 by brazing materials, respectively, to maintain the vacuum in the vacuum grounding container 4.

A pair of vacuum buses 12 extending in a direction perpendicular to the end of the power supply-side conductor 8 extending in the vertical direction are supported by the connecting portion 40. That is, the connection portion 40 is provided with a screw hole at the tip of the power supply-side conductor 8, the tip ends of a pair of vacuum buses 12 having through holes corresponding to the screw holes are stacked and arranged, and the tip end of the vacuum bus 12 is arranged. Are provided with through holes corresponding to the screw holes. A screw rod 44 is inserted into these holes, and a nut 45 attached to the screw rod 44 is rotated and tightened.
A pair of vacuum buses 12 are supported on the distal end of the power supply-side conductor 8.

The pair of vacuum buses 12 penetrate through the bus bar-side support portion 46 of the ceramic member. Sealing fittings 47 and 48 are provided at the front end and midway of the busbar-side support portion 46. One of the sealing fittings 47 and the bellows 49 are connected by a brazing material, and the bellows 49 is connected to the other end 60 by welding. The sealing fitting 48 is attached between the busbar-side supporting portion 46 and the insulating holding portion 50. A relay portion 55 made of an elastic member is connected by brazing between a projection 53 provided on each vacuum bus bar 12 opposite to the connection portion 40 and a corresponding concave portion 54 of the other vacuum bus bar 12. .
The relay portion 55 expands and contracts in accordance with the increase and decrease of the current load flowing through the vacuum bus 12 and the relay portion 55. In particular, when the relay portion 55 expands, the projection portion 53 collides with the concave portion 54, and the metal cutting powder generated at this time becomes external. It is prevented from being discharged to.

At the outer end and the inner end of the insulating holding portion 50, a threaded adjusting portion 51 and a screw rod 44 projecting therefrom are mounted. The power supply side support portion 41 and the busbar side support portion 46 described above.
An insulating rubber cover 52 is fitted in close contact with the outside of the insulating holding portion 50. The insulating rubber cover 52 is formed integrally with four insertion holes into which the power supply side support 41 and the busbar side support 46 and the insulating holding part 50 are inserted. In addition, ground metal powder is mixed into the insulating rubber cover 52 to take measures to prevent electric shock even if an operator touches it.

When the adjusting portion 51 is rotated, the insulating holding portion 50 is pressed correspondingly and spreads outward so that the insulating holding portion 50 and the insulating rubber cover 52 are brought into close contact with each other. The close contact work and the tightening work can be performed easily only by rotating the adjustment unit 51. In other words, convenience is good.

In this state, the vacuum bus 12 and the periphery of the power supply-side conductor 8 are maintained in a vacuum. To create a vacuum,
A communication pipe (not shown) that penetrates through the insulation holding section 50 and reaches the vicinity of the nut 45 is provided in the insulation holding section 50, and the inside of the communication pipe is evacuated to a vacuum state, and then the communication pipe is sealed. Alternatively, a corrugated brazing material may be arranged between the corresponding vacuum bus bar 12 and the relay portion 55, and when vacuum brazing, the air inside the corrugated concave portion may be evacuated to evacuate.

As described above, the vacuum bus 12, the power supply-side conductor 8, the connecting portion 40, and the like maintain insulation by vacuum.
Since there is no need to cover the conductor with an insulating member such as a synthetic resin as in the prior art, cooling can be performed well and the size can be reduced.

Further, since the present invention can be used even if the grounding device and the disconnection position are removed, the vacuum grounding container and the operating mechanism can be further reduced in size, so that the circuit switchgear can of course be reduced in size. Also, three-phase vacuum switchgears may be assembled in one vacuum grounding vessel. Further, a normal conductor other than a vacuum state may be used from the vacuum grounding container to the vacuum bus. Needless to say, the fixed electrode 5 can be set at the reference position or the countermeasure against metal vapor can be applied to the case where electric power is supplied from the movable electrode 7 to the load-side conductor via the movable blade.

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 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, 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.

[0049]

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 is reduced, and the power loss and the generated heat can be reduced accordingly.

The movable electrode is connected between the load-side conductor and the movable electrode by a flexible conductor that does not slide directly on the load-side conductor, and no welding occurs on the load-side conductor and the movable electrode. Further, not only the size of the vacuum switchgear can be reduced, but also the current cutoff characteristics can be improved, so that the vacuum grounding container can be further reduced in size. This can be used for a switchgear for one circuit from which the grounding device is removed, and the vacuum vessel and the operating mechanism can be reduced in size by removing the grounding device.

Further, since the fixed electrode and the power supply side conductor are connected by the connection conductor, when connecting the fixed electrode at the same position and the power supply side conductor at a different position in each phase, the position from the reference position of the fixed electrode to any position. It is easy to determine whether to arrange the power supply side conductor, and it is easy to design and manufacture.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a three-phase vacuum switchgear according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a three-phase vacuum switchgear used in FIG.

FIG. 3 is a plan view of the relationship between the three-phase vacuum switchgear of FIG. 1 and a vacuum bus seen from above.

FIG. 4 is a plan view of a relationship between a three-phase vacuum switchgear and a vacuum bus, which is another embodiment of FIG. 1, as viewed from above.

FIG. 5 is a side sectional view showing the configuration of the three-phase vacuum switchgear of FIGS. 1 and 2 in a no-load state.

FIG. 6 is a side sectional view showing a grounded state of the circuit switchgear of FIG. 3;

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

8 is a side sectional view showing the connection structure between the three-phase vacuum switchgear of the present invention and the vacuum bus of FIG. 5;

FIG. 9 is an enlarged sectional side view of FIG. 8;

FIG. 10 is an enlarged sectional side view of FIG. 8;

[Explanation of symbols]

1-3 ... 3-phase vacuum switchgear, 4 ... vacuum grounding vessel, 5
... fixed electrode, 6 ... ground electrode, 7 ... movable electrode, 8 ... power supply side conductor, 8A ... connection conductor, 9 ... load side conductor, 10 ... cable head, 11 ... movable blade, 12 ... vacuum busbar, 34
... flexible conductor.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuzo Shibata 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 In the Power & Electric Equipment Development Division, Hitachi, Ltd.

Claims (12)

[Claims] A fixed electrode, a ground electrode, and a load-side conductor disposed in a vacuum ground container, a movable electrode that comes into contact with and separates from the fixed electrode and the ground electrode, and a movable electrode that is connected via a fulcrum connected to the movable electrode. A movable blade provided in a vacuum grounding container to be brought into contact with and separated from the electrodes, and a power supply side conductor connected to an external conductor from the vacuum grounding container and a fixed electrode are connected by an electric means. Switchgear to do. 2. A fixed electrode, a ground electrode, and a load-side conductor disposed on one side and the other side in a longitudinal direction in a vacuum grounding container. A movable electrode connected to the movable electrode, and a movable blade provided in a direction perpendicular to the longitudinal direction of the vacuum grounding container for moving the movable electrode between the two electrodes via a fulcrum connected to the movable electrode. Switchgear characterized. 3. A switch gear, wherein the fixed electrode according to claim 1 and the power supply side conductor are connected by a connection conductor, and the fixed electrodes of each phase switch gear are arranged at the same position. 4. A connection portion of a switchgear of each phase in which a power supply-side conductor extending outside the vacuum grounding vessel of each phase and a power supply bus of each phase are orthogonal to each other, are arranged at different positions. Alternatively, the switchgear according to 2. 5. A connection portion of a switchgear of each phase for connecting a power supply side conductor extending outside the vacuum grounding container of each phase and a power supply bus extending along a longitudinal direction of the vacuum grounding container is arranged at the same place. The switchgear according to claim 1 or 2, wherein: 6. A switchgear, wherein the power supply bus according to claim 1 is insulated by vacuum means. 7. A switch gear comprising a movable electrode connected to the load-side conductor according to claim 1 or 2, and a movable plate and a part of the fixed electrode provided with a current blocking means. 8. A switchgear using a flexible conductor for said electric means according to claim 1. 9. A switchgear having a disconnection position while the movable electrode according to claim 1 or 2 moves from a closing position to a grounding position. 10. A fixed electrode, a ground electrode, a load-side conductor, and a movable electrode which comes in contact with and separates from both electrodes are disposed on one side and the other side in a vacuum grounding vessel. The switchgear according to claim 1 or 2, wherein the vacuum grounding container is configured such that one side of one side of the grounding container has a larger volume than the other side. 11. The switchgear according to claim 1, wherein one or more of a circuit breaker, a disconnector, a load switch, and a grounding device are used as a switchgear. 12. A switchgear, wherein a closed container having an insulating medium is used in place of the vacuum grounding container according to claim 1.