JP3374723B2 - Vacuum switchgear - Google Patents

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 vacuum switchgear in which breakage of an arc generated when opening a fixed electrode and a movable electrode is improved.

[0002]

2. Description of the Related Art It is difficult to locate a distribution substation with a 6KV supply in response to an increasing demand in a city where power consumption is concentrated.
Efficient power supply by boosting the distribution voltage, that is, by positively absorbing the load in the 22KV system whose capacity per line is larger than 6KV, due to the lack of allocation of distribution pipes and the increased utilization rate of the 6KV supply facility. It leads to equipment formation.
For this reason, it is necessary to make 22KV power distribution equipment compact as much as 6KV.

As a power receiving and transforming device for downsizing,
For example, the SF described in JP-A-3-273804
₆ Gas insulated switchgear is possible. This Japanese Patent Laid-Open No. 3-
The SF ₆ gas insulated switchgear described in Japanese Patent No. 273804 has a gas circuit breaker, two disconnecting switches and a grounding switch individually provided in a unit chamber and a bus chamber in which a distribution box is filled with SF ₆ gas. It is manufactured and stored. When using a vacuum circuit breaker as the circuit breaker ,
The movable electrode moves up and down with respect to the fixed electrode,
Blocking or, or as in the vacuum circuit breaker as described in JP 55-143727 and JP-movable spindle as a fulcrum
Contact or away with respect to the fixed electrode movable electrode of the movable leads and vacuum chamber corresponding to the blade is rotated to the left and right, up, there is to block.

The gas insulated switchgear receives electric power from a power company, for example, by a disconnecting switch and a gas circuit breaker, converts it into an optimum voltage for a load by a transformer, and supplies electric power to a load such as a motor. To maintain and inspect the power receiving and transforming equipment,
After turning off the gas circuit breaker, open the disconnecting switch provided separately from the gas circuit breaker, and further ground the switch to ground the residual charge and induced current on the power supply side, and re-apply from the power supply. To protect workers' safety. Further, if the grounding switch is grounded while the bus bar is charged, an accident may occur, so an interlock is provided between the disconnector and the grounding switch.

[0005]

The object of the invention is to be Solved However, JP
Vacuum circuit breaker described in Japanese Patent No. 55-143727
Then, the arc that occurs when the movable electrode touches and separates from the fixed electrode
Isn't consideration given to efficiently extinguishing arcs?
It was.

The present invention has been made in view of the above points,
The place of interest, provide a vacuum scan <br/> Itchigiya improves the current interrupting performance an arc generated when the movable electrode toward or away from the fixed electrode and efficiently extinguish the vacuum earthing vessel can be miniaturized To do.

[0007]

In the present invention, the above object is achieved.
Fixed electrode placed in a vacuum grounded container to achieve
And the fixed electrode and the movable electrode contacting and separating from the ground electrode face each other.
A plurality of spiral grooves are provided on the electrode surface to
A ring-shaped running surface is formed on the electrode surface on the outer peripheral edge side of the groove
And the gap width at which the fixed electrode and the movable electrode face each other.
Through the fulcrum connected to the movable electrode,
And a movable blade side which is rotated to extend outside the vacuum grounding container.
Is gradually narrowed from the opposite side toward the movable blade side
Is characterized by.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention with reference to FIG. 1 to FIG. The circuit diagram of FIG. 1 shows the entire collective switchgear, and an electric circuit adapted to the structure of the circuit switchgear for one circuit of FIG. 1 is shown in FIG. 2, and the circuit switch for one circuit of FIG. The structure of the gear is shown in FIGS. 3 and 4. Figure 5 shows the relay terminal plate 27 connected by bus between circuits Suitchigi ya phases.

As shown in FIG . 1, multi-phase , for example, three switch circuit gears 1, 2 and 3 for three circuits are arranged in a vacuum grounding container 4 which is grounded E. Switch gear for each 3 circuits 1,
Since the configurations 2 and 3 are the same, the switch gear 2 for the second three circuits will be described here, and description of the other circuit switch gears will be omitted. The second circuit switch gear 2 is an assembly of three phases of the phase switch gears 2X, 2Y and 2Z. Since the switch gears 2X, 2Y, 2Z for each phase have the same configuration,
Here, only the first-phase phase switch gear 2X will be described, and description of the other phase switch gears 2Y and 2Z will be omitted.

The phase switch gear 2X is a combination of a breaking function, a disconnecting function, a grounding function and a bus bar.
That is, the phase switchgear 2X is composed of a movable electrode 7 for mainly moving between the stationary electrode 5 and the ground electrode 6 and the electrodes. The fixed electrode 5 is connected to the power supply side conductor 8. The movable electrode 7 is connected to the load-side conductor 9,
Is connected to a cable head 10 extending outside the vacuum grounding container 4 . Further, the movable electrode 7 is mechanically connected to the movable blade to be described later, allowed by the operation mechanism (not shown)
The moving blade is rotated, and by the rotation of the movable blade , it is rotated in the vertical direction or the horizontal direction. In addition, 3 circuits
The switch gear 1 is a power supply side cable 1 connected to the movable electrode 7.
1 electrically connects to the system power supply 12 . When the movable electrode 7 moves from the fixed electrode 5 to the ground electrode 6, FIG.
Stop at position 4.

That is, as the movable electrode 7 rotates,
The movable electrode 7 is energized at the closing position Y1 where it contacts the fixed electrode 5, and is rotated below the closing position Y1 to separate the movable electrode 7 from the fixed electrode 5 at the cutoff position Y2 to cut off the current. Further, the movable electrode 7 separates from the fixed electrode 5 at the disconnection position Y3 by rotating further downward so as to prevent insulation breakdown due to lightning or the like and to provide an insulation distance on the load side conductor side where an operator is not electrocuted. Further, the movable electrode 7 rotates further downward so that the movable electrode 7 comes into contact with the ground electrode 6 at the ground position Y4. Even if the disconnection position Y3 is omitted and the disconnection position Y2 is moved to the ground contact position Y4 , the effect thereof is not impaired.

In a vacuum, which is a high insulator, 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, so that the operation is easy. Easy to use . Further, since the movable electrode 7, the fixed electrode 5, and the ground electrode 6 are gathered in one place, the size can be further reduced as compared with the prior art. Furthermore, the disconnection position Y
When 3 is provided, when different power supplies are matched, for example, when receiving two lines with two system power sources, the phase switch gear 2X of any one line is operating at the closing position Y1 and the phase switch gear 2Y of the other line is in the disconnection position. In the standby mode at Y3, it is not only safe for workers to contact the load-side conductor 9, but also when switching from the standby mode to the operating mode or from the operating mode to the standby mode, continuous operation is possible. Is fast and easy to operate.

Further, the current flowing through the current transformer 13 is detected by the current transformer 13 to maintain it.
Operate the protection relay 14 to operate the operation mechanism section (not shown).
Corresponding to an accident in the grid by trippingCan
It

[0014] vacuum earthing vessel 4 that is grounded E uses stainless steel member, the formation of a portion of a spherical or curved shape
Accordingly , the mechanical strength of the vacuum grounded container 4 is increased, and the wall of the vacuum grounded container 4 is thinned to reduce the weight. Vacuum earthing container 4 is accommodated in the switchboard 16 as shown in FIG. 3. Switchboard 16 is operated above and below the vacuum earthing vessel 4 compartments 17 and conductor compartments 18 are provided. Operating compartment 17
Is recessed on the right side of the vacuum grounding container 4, that is, on the depth side, and has an openable door 19 attached to the front side. The conductor compartment 18 is arranged on the left side of the vacuum grounding container 4, that is, on the front side.

The operation compartment 17 and the conductor compartment 18 are arranged obliquely symmetrically with respect to each other via the vacuum grounding container 4. The operation compartment 17, housing an operating mechanism unit for rotating the movable blade and the movable electrode 7
I am doing . The conductor compartment 18 houses a load-side conductor 9 and the cable head 10. On the operating compartment 1 7 hand front side of the vacuum earthing container 4, such as can put a tool for maintenance of the operating compartment 17, it is easy maintenance. Further, the conductor compartment 18 is arranged on the front side in front of the operation compartment 17 so that the work of attaching the cable head 10 can be performed safely.

[0016] Returning to FIG. 1, on the front side of the <br/> wall of vacuum earthing vessel 4, nine bushing 21 is mounted.
In the first circuit switch gear 1, one side of the three-phase power supply side cable 11 penetrates the bushing 21 and is connected to the external system power supply 12. Also in the second and third circuit switch gears 2 and 3, the load side conductor 9 on one side of each of the three phases is
It penetrates through the bushing 21 and is connected to the cable head 10. When connecting, the load side conductor 9 is inserted into a connector (not shown) provided on the cable head 10.
The load-side conductor 9 of the cable head 10 using the full <br/> Rekishiburu conductor 22 shown in FIG. 3, the transformer TR, other circuits,
It is connected to a load such as a motor. The phases of the second circuit cable head 10 of the switchgear 2, which only set the current transformer 3, as shown in FIG. The transformer 3 is also provided to other circuit switch gears as required such as load conditions.

The ground electrode 6 includes nine cable heads 10.
In response to being placed on the top, it connects the common ground conductor 24 in the ground conductor 38. Both ends of the common ground conductor 24 are fixed to the switchboard 16 by ground screws 25. These cable head 10, ground conductor 38, current transformer 13
All of them can be seen from the front side to prevent forgetting to attach them, and to make the attachment and detachment work easier for the worker to improve work efficiency.

Between the three circuit switch gears, the power source side conductor 8 directly connects between the circuit switch gears in FIG.
It is also to that connected between the circuit switch gear directly to easily understand the embodiment. The relay terminal board 27 of FIG.
As shown in FIG. 5, 9 supports nine fixed electrodes 5 and is attached to the inner wall surface of the vacuum grounding container 4 . When placing the power supply side conductor 8 to the relay terminal plate 27 sequentially as it goes from the left to the right relay terminal plate 27, the first circuit switchgear 1 from the second, third circuit switchgear 2 The power supply side conductor 8 is arranged. When arranging, the power supply side conductor 8 of each circuit switch gear has two-phase and three-phase 1Y-3Y, 1Z- with the fixed electrode 5 of 1-phase 1X, 2X, 3X on one side.
The 3Z fixed electrode 5 is arranged while being wrapped on the other side to facilitate wiring, and measures are taken to prevent wiring mistakes and to prevent thermal deterioration due to the dispersed arrangement of internal busbars.

Switch gears 1 to 3 for the first to third circuits
3 is arranged in the vacuum grounding container 4 and has the following configuration . Since each phase switchgear 2X~2Z configuration is the same, here shown and described only the configuration of the phase switchgear 2X for one phase in FIG. 6, the other phase switchgear 2Y, a description of 2Z omitted.

[0020] As FIG. 6, the interior of the vacuum earthing container 4,
A fixed electrode 5 which is disposed opposite to the ground electrode 6, the solid
And the movable electrode 7 to pivot between a constant electrode 5 and the ground electrode 6 is <br/> arranged, via a flexible conductor 22 to the movable electrode 7
Then, the load-side conductors 9 are connected and arranged, and these are arranged in a cross shape as a whole. Vacuum earthing container 4 (not shown) formed of three through-holes ground electrode 6 extending through the movable blade 30 and the load-side conductor 9 to rotate the movable electrode 7, vacuum earthing vessel 4 at one end and it extends to the outside of.

The ground electrode 6 is provided with a ground-side bottom metal fitting 31 on one end side, and has a ground-side bushing 32 made of a ceramic material whose other end side is open. A flange 32 is provided on the outer circumference of the ground-side bushing 32. The ground side sealing metal fitting 34 attached to 32 is welded to the vacuum ground container 4. A grounding side bellows 35, a spring 36, and a grounding side conductor 37 are arranged in the grounding side bushing 32 . The ground-side conductor 37 extends to the outside through the ground-side bottom metal fitting 31, and the end of the ground-side conductor 37 is connected to the common ground conductor 24 by the screw. The ground conductor 38 is made of a flexible conductor and can be electrically connected even when the ground-side conductor 37 moves.

In addition, the side to which the ground conductor 38 is connected
A ground electrode 39 is fixed to the ground side conductor 37 on the opposite side. When the ground electrode 39 is pushed to the ground side bottom metal fitting 31 side,
The spring 36 shrinks together with the ground-side bellows 35, but the spring 36 constantly presses the ground electrode 39 toward the movable electrode 7 due to the contracting force.

Fixed electrode 5 arranged opposite to ground electrode 6
Is connected to the three-phase power source side conductor 8. The three-phase power supply side conductors 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 metal fitting 41. The fixed support fitting 43 that supports the other end of the fixed insulating cylinder 42 is fixed to the vacuum grounding container 4 by a brazing material. That is, the fixed insulating cylinder 4
A fixed relay metal fitting 41 and a fixed support metal fitting 43 are previously attached to both ends of 2. In the case of the phase switchgear for one phase, the power source side conductor 8 may be directly connected to the fixed electrode 5 without passing through the relay terminal 27.

The movable electrode 7 is arranged between the ground electrode 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 metal fitting 44. One end of the movable support metal fitting 46 is
The movable support fitting 46 is supported by the movable blade 30. The movable blade 30 penetrates the movable support plate 47 and extends to the outside. The movable support plate 47 is fixed to the vacuum ground container 4. Movable blade 30 is surrounded by a telescopic movable bellows 48, at one end the movable support bracket 46 of the movable bellows 48, the other end is attached respectively to the movable support plate 47, the movable blade 30 is left, to pivot up and down I am able to Movable blade 30
Rotates about the spindle 49 as a fulcrum and moves with this rotation
When the electrode 7 moves in the direction of arrow X1 or X2, the ground electrode 39
Alternatively, it is brought into contact with or separated from the fixed electrode 5.

The tip of the movable blade 30 is connected to an operating mechanism (not shown), the driving of the operation mechanism unit, the movable blade 30 pivots spindle 49 as a fulcrum. The operation shaft 50 connects the movable blade 30 and the operation mechanism section. The movable electrode is attached to the tip of the movable blade 30.
A structure in which only 7 is provided may be used. In this case, an insulating means for interrupting the electric current is required in any one of the movable blade 30 and the operating mechanism section.

The tip of the movable electrode 7 and the load-side conductor 9 are connected by a flexible conductor 22. Load side conductor 9 is connected to the cable head 10 through the load-side bushing 21A made Ri by a ceramic material. A load-side sealing metal fitting 53 is provided at the end of the load-side bushing 21A, and a brazing material is welded and supported around the opening formed in the vacuum grounding container 4 to support the load-side sealing metal fitting 53. A grounding metal layer 54 is provided on the ceramic surface of the load side bushing 21A exposed inside so that an eddy current flows to the grounding E through the vacuum grounding container 4 and even if an operator contacts the cable head 10. Safety measures are taken to prevent danger.

Next, the operation of the phase switch gear will be described with reference to FIGS. The movable electrode 7 is arranged between the ground electrode 6 and the fixed electrode 5 as shown in FIG. 6, and from the positions of the interruption position Y2 and the disconnection position Y 3 shown in FIG. 2, as shown in FIG.
The state of FIG. 7 in which the movable electrode 7 is rotated in the arrow direction X1 and the movable electrode 7 contacts the ground electrode 39 is the so-called ground position Y4, and the ground electrode 39 is always in the direction of the movable electrode 7 by the spring 36.
Is pressed by . As shown in FIG. 8, the movable electrode 7 rotates in the arrow direction X2 from the ground position Y4, the movable electrode 7 is in contact with the fixed electrode 5, and is also connected to the load-side conductor 9.
This is the so-called loading position Y1.

As described above, at the closing position Y, the movable electrode 7 is in contact with the fixed electrode 5 and also connected to the load side conductor 9. In this case, unlike the prior art, electric 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, so that the current path is connected to the above-described conventional art. Compared with that, the electric resistance was reduced correspondingly , and it was possible to reduce the power loss and the generated heat.

On the other hand, at the closing position Y1, electric power is constantly supplied to the load, and this operating time is longer than the operating time at other positions, and if the flexible conductor 22 is not used, the movable electrode 7 is directly on the load side. Sliding contact with the conductor 9 is conceivable. This is because the movable electrode 7 slides directly on the load side conductor 9.
The movable electrode 7 and the load-side conductor 9 are in contact with each other, and the current continues to flow, and the heat generated at this time may cause the movable electrode 7 and the load-side conductor 9 to be welded. As a result, the movable electrode 7 and the load-side conductor 9 that are welded
Although it can be used at least if the turning force of the operating mechanism is increased in order to separate and, the size of the operating mechanism is inevitable, and the vacuum circuit breaker becomes large and costly.
Further, to slide in generating heat stroke, wear life of intense Ku electrodes thus kept short. Further, when the movable electrode 7 slides in contact with the load side conductor 9 may fine metal particles generated from the movable electrode 7 and load-side conductor 9, remains inside diffuses into vacuum earthing vessel 4, an insulating It is easily destroyed.

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 22 which does not slide directly on the load-side conductor 9. The welding of the side conductor 9 does not occur, the turning force of the operating mechanism portion does not become larger than that described above, and the operating mechanism portion can be downsized . In addition, the movable electrodes 7 and the load-side conductors 9 also have a longer life than the above, which is economically advantageous. Moreover, a flexible conductor 22 connects the load-side conductor 9 and the movable electrode 7, without generating a fine metal particles as described above, the current interruption characteristic is clear that rather than above greatly improved this minute, vacuum earthing vessel 4 <br/> miniaturization.

Further, as shown in FIG. 5, when the movable electrode 7 moves from the insertion position Y1 in contact with the fixed electrode 5, both electrodes (both electrodes have the same structure, so the movable electrode 7 will be described as an example). An arc A is generated in the arc as shown in FIGS. The arc A magnetically drives along the spiral groove 7A of the movable electrode 7 from the electrode center portion O toward the electrode outer peripheral end side, and reaches the ring-shaped running surface 7B at the outer peripheral end. The arc A is extinguished by magnetically rotating along the traveling surface 7B. This is because the gap width G between the fixed electrode 5 and the movable electrode 7, because the movable blade 30 side becomes successively narrower toward the movable blade 30 side of the opposite side.

If Atehamere [0032] This is the electromagnetic force, electromagnetic force will be going to become successively stronger towards from the opposite side to the movable blade 30 side of the movable blade 30 side. Generally, an arc has a property of moving in the direction of strong magnetic flux. Therefore, for example, the arc A1 on the upper traveling surface 7U is magnetically driven toward the lower traveling surface 7W by being attracted by the electromagnetic force on the movable blade 30 side, and is lowered by the acceleration force of the arc A1 which is rotationally magnetically driven. The arc A2 on the side traveling surface 7W is also the upper side traveling surface 7U.
It is presumed that the arc is extinguished while magnetically driving toward the side.

[0033] Thus, since the arc A is efficiently extinguishing while rotating magnetic driving the running surface 7B, interruption performance is remarkably improved as compared with the electrodes of the prior art. Also, arc A
1 and A2 are less likely to jump out of the traveling surface 7B, and there is no danger of punching out the inner surface of the vacuum grounding container 4, and the countermeasure is to be taken.
I no longer need it . In this case, the electromagnetic force is generated by the movable blade 30.
It suffices that the movable blade 30 and the side opposite thereto are strengthened sequentially toward the movable blade 30 side.

Further, in the case of adjusting the electromagnetic force, that by changing the length of the movable blade 30 of the vacuum earthing vessel 4, to varying strong point adjust the gap width G between the fixed electrode 5 and the movable electrode 7 You can For example, the gap width G is adjusted by the movable insulating cylinder 45.
The length can be changed, or the position of the main shaft 49 can be changed to easily perform the operation. The angle of inclination, the gap width G is inclined to become successively narrower toward an opposite direction of the movable blade 30 side of the movable blade 30 side. The gap width G is also adjusted by providing the movable blade 30 and the gap width G in the larger area or volume in the vacuum grounding container 4, so that the gap width G can be easily adjusted without changing the design.

The spiral groove 7A of the above is not limited thereto and may be, for example, a groove for the arc A on the running surface 7B from the electrode center O magnetic driven (e.g. linear shape). Although a possibility that the arms A alone providing the straight-line-shaped grooves punched inner surface of the vacuum earthing container 4 is eliminated, even in this case,
It is important that the electromagnetic force is configured to be sequentially stronger toward an opposite direction of the movable blade 30 side of the movable blade 30 side. This groove may be formed on the contact surface of the ground electrode.

Furthermore, since the present invention can also be used to remove ground device and the disconnected position, this minute, vacuum earthing vessel, it can compact the operation mechanism unit, can of course be appreciated miniaturization circuit switchgear.

Further, vacuum earthing vessel fixed electrode side from the center of the movable electrode 7 positioned between the fixed electrode 5 and the ground electrode 6
4 is the volume C5 of the vacuum ground container 4 on the side of the ground electrode C6
Make it wider. In order to make the volume C5 larger than the volume C6 , the distances from the center O of the movable electrode 7 located at the center between the ground electrode 39 and the fixed electrode 5 to the vacuum ground containers 4 on the fixed electrode side and the ground electrode side are L1 and L2. Then L1> L2
The vacuum grounding container 4 may be configured so that

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 electric charge and the induced current on the power source side to the ground, so that the on / off of the current is fixed. Since the ground electrode 6 is much smaller than the ground electrode 6, the volume C6 may be smaller than the volume C5 . By the way
However, compared with the ground electrode 6 , the fixed electrode 5 frequently turns on and off a large current, and both electrodes 5 and 7 are turned on and off at the time of turning on and off.
Since a larger amount of metal fine particles are generated from the ground electrode 6,
By making the volume C5 wider than the volume C6 , most of the metal fine particles diffuse in the volume C5 . This allows
Residual ions is reduced, it is possible to prevent decrease in current breaking performance due to a delay of the insulation recovery, since it is possible to improve the current interrupting performance, small even this amount switchgear
Can be converted .

Further, fine metal particles, it is possible to diffuse the vacuum earthing container 4 of the fixed electrode side, there is no compromising dielectric strength. Furthermore, this volume C5 can also cool the heat generated when a large current is interrupted.

Another embodiment of the present invention will be described with reference to FIG. As shown in FIG. 11, the substantially rectangular vacuum grounding container 4 having a depth D longer than the height H has a fixed electrode 5 inside.
And the movable electrode 7 in contact with the fixed electrode 5 is housed.
At the same time, the same spiral groove and running surface as in FIG. 9 are formed on the facing surfaces of both electrodes. Fixed electrode 5 is a connecting conductor 8A
Is connected to the power source side conductor 8 through the through hole of the insulating ceramic member 60 fixed to the vacuum grounding container 4, and is connected to the three-phase power source side busbar 61.
3-phase power supply side busbar 61 extends perpendicularly to the power supply side conductor 8. The connecting rod 62 is inserted into the through holes provided in the power source side conductor 8 and the power source side bus bar 61, and the insulating fastening means 63 attached to the connecting rod 62 is rotationally moved to fasten both. A connection portion near the connection rod 62 and the like is surrounded by an insulating cover 64. 50A is an operation device box which houses the operating mechanism unit 50B.

The arc generated when the movable electrode 7 is turned on or off to the fixed electrode 5 is formed on the opposing surfaces of both electrodes.
Extinguishes arc with the spiral groove and running surface. And,
The power supply side conductor 8 can be placed at any point of the vacuum earthing container 4 by connecting conductors 8A solid a constant electrode 5 as the reference position.
That is, since the connection parts near the three-phase power source side conductor 8 and the connecting rod 62 can be arranged at different positions from those of the three phases, the design can be easily changed.

[0042]

The vacuum switchgear of the present invention described above
According to the method, an error that occurs when the movable electrode comes into contact with and separates from the fixed electrode.
The current interruption performance is improved by extinguishing the arc efficiently.
In addition to being able to reduce the size of the vacuum grounded container,
There is a fruit.

[Brief description of drawings]

1 is a circuit diagram showing a vacuum switchgear of the aggregated according to an embodiment of the present invention.

[2] In the circuit diagram showing the construction of a vacuum switchgear FIG. 1
There is .

FIG. 3 is a side sectional view showing the structure of the vacuum switchgear of FIG.
Is .

FIG. 4 is a diagram of FIG. 3 viewed from the left side.

5 is a plan view of the busbar connection terminal block shown in FIGS. 1 and 3. FIG.
Is .

FIG. 6 shows the unloaded state of the vacuum switchgear shown in FIG.
It is a side sectional view showing.

FIG. 7 shows a grounded state of the vacuum switchgear shown in FIG.
It is to the side sectional view.

FIG. 8 shows a closed state of the vacuum switch gear shown in FIG.
It is to the side sectional view.

9 is a plan view showing a movable electrode adopted in the vacuum switch gear shown in FIG .

10 is a side sectional view of a variable dynamic electrode shown in FIG.

11 is a view <br/> to side cross-sectional view of another embodiment of a vacuum switchgear of the present invention.

[Explanation of symbols]

Switch gears for 1 , 2, 3, ... 3 circuits, 2X , 2Y, 2Z
... Phase switch gear, 4 ... Vacuum ground container, 5 ... Fixed electrode,
6 , 39 ... Ground electrode, 7 ... Movable electrode, 7A ... Spiral groove, 7B ... Traveling surface, 8 ... Power supply side conductor, 9 ... Load side conductor,
10 ... Cable head, 11 ... Power supply side cable, 12 ...
System power supply, 13 ... Current transformer, 14 ... Protection relay, 16 ... Distribution
Switchboard, 17 ... Operation compartment, 18 ... Conductor compartment
Statement, 21 ... Bushing, 21A ... Load side bush
, 22 ... Flexible conductor, 24 ... Common ground conductor,
27 ... Relay terminal board, 30 ... Movable blade , 32 ... Ground side
Bushing, 35 ... Grounding side bellows, 36 ... Spring, 37
... Grounding side conductor, 38 ... Grounding conductor, 41 ... Fixed relay metal fitting,
42 ... fixed insulating cylinder, 43 ... fixed support bracket, 44 ... variable Dochu
Joint fitting, 45 ... Movable insulating cylinder, 46 ... Movable support fitting, 47
... Movable support plate, 48 ... Movable bellows, 49 ... Main shaft, 50
... operating axis, 53 ... load side sealing metal fitting, 54 ... ground metal layer .

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ayu Morita 7-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi, Ltd. Electric Power & Electrics Development Division (72) Inventor Kazuhiro Oyama Ichi-Kokubuncho, Hitachi-shi, Ibaraki 1-chome No. 1 Share company Hitachi Kokubun factory (56) Reference JP-A-9-153320 (JP, A) JP-A-58-48319 (JP, A) JP-B 1-136222 (JP, B2) ) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02B 13/02 H01H 33/66

Claims (4)

(57) [Claims] 1. A vacuum grounded vessel, fixed electrodes arranged in the vacuum earthing vessel, ground electrodes, and the stationary electrode and the ground electrode
And toward and away from the movable electrode to the preparative, a movable blade extending outside the vacuum earthing vessel is rotated the movable electrode through a fulcrum coupled to said movable electrode, is connected through the movable electrode and the flexible conductor, the and a load-side conductor <br/> body extending outside the vacuum grounding container, multiple scan the electrode surface of the fixed electrode and the movable electrode are opposed to each other
The Pairaru groove is provided, each of said forms the running surface of the-ring shaped electrode surface of the outer peripheral end of the spiral groove, and a gap width of the fixed electrode and the movable electrode are opposed, the movable blade-side
The vacuum switchgear is characterized in that it is gradually narrowed from the opposite side to the movable blade side. 2. A cable head is connected to the load-side conductor.
Vacuum switchgear according to claim 1, characterized in that it is. 3. Located between the ground electrode and the fixed electrode
In the vacuum ground container on the fixed electrode side from the center of the movable electrode
Make the volume larger than the volume inside the vacuum grounding container on the grounding electrode side.
The vacuum switchgear according to claim 1 , wherein the vacuum grounding container is configured so that 4. A vacuum grounding container and an arrangement inside the vacuum grounding container.
Fixed electrode, ground electrode, and fixed electrode and ground electrode
A movable electrode that comes in and out of contact with a fulcrum connected to the movable electrode.
The movable electrode is rotated to extend outside the vacuum grounding container.
The movable blade, the movable electrode and the flexible conductor.
Load side conductor connected outside through the vacuum grounding container.
And a plurality of electrodes on the electrode surface where the fixed electrode and the movable electrode face each other.
An electrode on the outer peripheral end side of each spiral groove provided with a spiral groove
A ring-shaped running surface is formed on the surface, and the fixed electrode
The gap width between the movable electrode and the movable electrode
From the opposite side to the movable blade side, gradually narrowing
If the above-mentioned vacuum grounding container is stored in the switchboard,
With the conductor compartment on the upper depth side.
It is placed on the lower front side and both compartments
The vacuum switchgear is characterized by arranging the contacts in a diagonal symmetry .