JP3402135B2 - Vacuum switch and 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 switch and a vacuum switchgear, and is applied to , for example, a power receiving and transforming device.
It relates to a preferred vacuum switch and a vacuum switchgear.

[0002]

2. Description of the Related Art In response to increasing demand in urban areas where power consumption is concentrated, distribution voltage has been reduced due to difficulty in locating distribution substations, lack of allocation of distribution pipes, and demand for high utilization rate of supply equipment. The positive boosting, that is, the active absorption of load in a higher voltage system that can increase the capacity per line, leads to the efficient formation of power supply equipment. For this reason, it is necessary to make the distribution equipment and power receiving and transforming equipment even more compact.

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. In this switchgear, a circuit breaker, two disconnecting switches , 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 moves up and down with respect to the fixed electrode by an operating device so that the circuit breaker is turned on and off, or is disclosed in Japanese Patent Laid-Open No.
As in the vacuum circuit breaker described in Japanese Patent Publication No. 143727,
The movable electrode turned to the right and left of the main shaft as a fulcrum, introduced by and away with respect to the fixed electrode, blocking.

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 ground the grounding switch to allow residual charge and induced current to flow to the ground and prevent re-application from the power supply. And, the worker's safety is protected. 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]

However, as described above,
In the conventional vacuum circuit breaker, the movable electrode is inserted into the fixed electrode.
After that, with the movable side and fixed side lead wires connected to both electrodes
Connect to the power supply and the cable head on the load side via a rod.
Since the movable electrode is connected to the power source and load from the fixed electrode
Distance to be connected to the side of the cable head becomes long, becomes large correspondingly <br/> power loss and heat generated.

The object of the present invention is to solve the above-mentioned problems,
Of course, it should be miniaturized by reducing power loss and heat generation.
Of course, it has high mechanical strength and is easy to operate.
It is to provide a vacuum switch and a vacuum switchgear that are convenient .

[0007]

The present invention has achieved the above objects.
Part of it is formed into a spherical or curved shape to
In the grounded vacuum container, the grounding device and the grounding device
They are arranged opposite to each other and are electrically connected to the bus bar.
Fixed electrode supported in an empty container through an insulator, and the fixed
A movable battery that rotates between the electrode and the grounding device to contact and separate
A pole is connected to the movable electrode and rotates the movable electrode
Movable blade and current from the movable electrode to the movable blade
Insulating means to prevent the flow of electricity, and the movable electrode and the frame.
With a load-side conductor that is electrically connected through a kisible conductor
And the movable blade is rotated through the main shaft.
Movably disposed in the vacuum container, and the grounding device,
The fixed electrode facing the grounding device and the movable
A movable electrode connected to the blade, the movable electrode and the flexible electrode.
The load-side conductor that is electrically connected through the sibble conductor
V-shaped vacuum switch or grounded
It is attached to the common conductor on the load side, which is placed in the vacuum vessel.
The ground side contact and the load side contact, and both contacts are separated.
The ground side movable electrode and the movable electrode,
Arranged at a right angle to the contact and separation direction with the load side contact,
A fixed electrode electrically connected to the
Flexibu for electrically connecting the fixed electrode and the movable electrode
A vacuum switch equipped with a conductor
To do.

Another embodiment of the present invention is a vacuum switch as described above.
One of the switches is stored in the switchboard and movable
Stores the operation mechanism that rotates the movable electrode via the blade.
Operating compartment, connected to the load-side conductor
Conductor compartment containing a cable head
The operating compartment above the vacuum vessel.
The conductor compartment of the vacuum vessel.
It is characterized in that it is a vacuum switchgear arranged on the front side
It

[0009]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The circuit diagram of FIG. 1 shows the whole collective switchgear, and FIG. 2 shows an electric circuit adapted to the structure of the circuit switchgear for one circuit of FIG. 1, and FIG.
3 and 4 show the structure of the circuit switchgear for one circuit. FIG. 5 shows a relay terminal plate 27 for connecting the respective phases of the circuit switch gear with a bus bar.

Multiple circuits, for example, three circuits of switchgear 1,
2 and 3 were placed in a vacuum container 4 which was grounded E. Since the circuit switch gears 1, 2 and 3 have the same configuration, the second circuit switch gear 2 will be described, and the description of the other circuit switch gears will be omitted. Circuit switch gear 2 is phase switch gear 2
It is a collection of three phases of X, 2Y and 2Z. Since the phase switch gears 2X, 2Y, 2Z have the same configuration, only the first phase switch gear 2X will be described and the other phase switch gears 2Y, 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 switch gear 2X is mainly composed of the fixed electrode 5 and the movable electrode 7 that moves between the grounding device 6.
The fixed electrode 5 is connected to the internal bus bar 8. The movable electrode 7 is connected to the load side conductor 9, and the load side conductor 9 is connected to the cable head 10 extending outside the vacuum container. The movable electrode 7 is mechanically connected to a movable blade described later, and is rotated in the up-down direction or the left-right direction by the rotation of the movable blade driven by an operation mechanism unit (not shown). Movable electrode 7
2 moves from the fixed electrode 5 to the grounding device 6, the
Stop in position. In addition, the circuit switch gear 1 has a movable electrode 7
It is electrically connected to the system power supply 12 by the power supply side cable 11 connected to.

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 and the like, and to provide an insulation distance at which the worker is not electrocuted on the load conductor side. Movable electrode 7 further below
Rotates to bring the movable electrode 7 into contact with the grounding device 6 at the grounding position Y4. Incidentally, even if the disconnection position Y3 is omitted and the disconnection position Y2 is moved to the ground contact position Y4, the following effects of the present invention are not impaired. In a vacuum, which is a high insulator, while the movable electrode 7 rotates from the fixed electrode 5 to the grounding device 6, it is possible to continuously have four positions, that is, a plurality of functions by one operation, so that the operation is easy and convenient. Is good . The movable electrode 7,
Since the fixed electrode 5 and the grounding device 6 are integrated in one place, the size can be further reduced as compared with the above-mentioned conventional technique. When the disconnection position Y3 is further provided, in the case of different power supply matching, for example, two-line power reception with two system power supplies, the phase switch gear 2X of any one line is in operation at the closing position Y1 and the phase 2X of the other line is in the disconnection position. It is safe for a worker to come into contact with the load-side conductor 9 of this circuit when waiting at Y3 . Even when switching from standby to operation or from operation to standby, continuous operation is possible, so the work speed is fast and the operation is easy. Further, by detecting the energizing current with the current transformer 13, the protection relay 14 is operated, and the operation mechanism section (not shown) is tripped, thereby dealing with a system accident.

The grounded vacuum container 4 is made of a stainless steel member, and a part thereof is formed into a spherical or curved shape to increase the mechanical strength of the vacuum container 4 and reduce the thickness of the vacuum container wall. To reduce weight. Vacuum container 4 is switchboard 1
It is stored in 6. The switchboard 16 is provided with an operation compartment 17 and a conductor compartment 18 above and below the vacuum container 4. The operation compartment 17 is arranged on the right side, that is, on the depth side of the vacuum container 4 so as to be recessed, and a door 19 that can be opened and closed is attached to the front side. The conductor compartment 18 is arranged on the left side of the vacuum container 4, that is, on the front side. The operating compartment 17 and the conductor compartment 18 are obliquely arranged symmetrically with respect to each other via the vacuum container 4. The operation compartment 17 houses the movable blade and an operation mechanism portion for rotating the movable electrode 17. The conductor compartment 18 houses the load-side conductor 9 and the cable head 10. A tool or the like for maintenance and inspection of the inside of the operation compartment can be placed on the vacuum container on the front side of the operation compartment 17, and the maintenance and inspection is easy. 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.

Nine bushings 21 are attached to the wall on the front side of the vacuum container. In the first circuit switch 1, one side of the three-phase power source side cable 11 is connected to an external system power source 12 through a bushing 21. Any second and third circuit switch 2, one side load side conductor 9 of the three phases are connected to the cable head 10 through the bushing 21. When connecting, the cable head 10 provided on the load-side conductor 9 is inserted. A flexible conductor 22 is used as the load-side conductor 9 in the bushing 21 and is connected to a load such as a transformer or a motor. To each phase of the second circuit switch cable head 10 of the switch 2, it passes through provided current transformer 13 as shown in FIG. Provided in accordance with current transformer 13 required such as load conditions in other circuit switches 1,3.

The grounding device 6 corresponds to nine cable heads, is arranged on the upper part thereof, and is connected to the common ground conductor 24 by the ground conductor 38. Both ends of the common ground conductor 24 are fixed to the switchboard 16 by ground screws 25. All of these cable heads 10, ground conductors 38, and current transformers 13 can be seen from the front side to prevent forgetting to attach them, and at the same time, the worker can perform attachment / detachment work well to improve work efficiency. I am trying to

In FIG. 1, the internal busbar 8 directly connects between the circuit switch gears for each of the three circuit switches, but this is because the circuit switch gears are directly connected for easy understanding of the embodiment. is there. In practice, the relay terminal plate 27 of FIG. 1 is mounted on the inner wall surface of the vacuum container having the relay terminal 26 configured by a part of the nine fixed electrodes 5 of FIG. The internal bus bar 8 is connected. When arranging each internal bus bar 8 on the relay terminal board 27, the relay terminal board 27 is sequentially arranged from the left side to the right side.
The internal busbars 8 of the first and second circuit switch gears are arranged. At the time of arrangement, the internal bus bar 8 of each circuit switchgear has the first phase 1X, 2X, 3X.
Is placed on one side while wrapping the second phase and the third phase 2X to 2Z, 3X to 3Z on the other side to facilitate wiring, and to prevent wiring mistakes and prevent thermal deterioration by distributing internal busbars. Etc. are taken.

First to third circuit switch gears 1 to 3
Is arranged in a vacuum container grounded E and has the following configuration. However, since each phase switch gear 2X to 2Z has the same configuration, only the configuration of the phase switch gear 2X for one phase will be described. The description of the other phase switch gears 2Y and 2Z will be omitted.
Inside the vacuum container 4 which is grounded E, a movable electrode 7 which rotates between a grounding device 6 and a fixed electrode 5 which is arranged correspondingly is arranged, and a cable head 10 is arranged correspondingly to the movable electrode 7. , These are arranged in a cross shape as a whole. The grounding device 6, the movable blade 30, and the load-side conductor 9 penetrating through three through holes (not shown) formed in the vacuum container 4 are extended outside the vacuum container.

The grounding device 6 has a grounding side bottom metal fitting 31 on one end side, a grounding side bushing 32 made of a ceramic material having an opening on the other end side, and a flange 33 on the outer circumference of the grounding side bushing 32. The grounding side metal fitting 34 attached to 33 is welded to the vacuum container 4. A grounding side bellows 35, a spring 36 and a grounding side conductor 37 are arranged in the grounding side bushing. The ground-side conductor 37 extends through the ground-side bottom metal fitting 31 to the outside, 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 composed of a flexible conductor,
Even when the ground side conductor 37 moves, it can be electrically connected.
In addition, the ground electrode 39 is provided on the ground side conductor 37 on the opposite side.
Is fixed. When the ground electrode 39 is pushed toward the ground side bottom metal fitting, the ground side bellows 35 as well as the spring 36 contract, but at that time, the spring 36 constantly presses the ground electrode 39 toward the movable electrode 7 due to the contracting force.

The fixed electrode 5 arranged corresponding to the grounding device 6 is connected to the three-phase internal bus bar 8. The three-phase internal busbars 8 are arranged as shown in FIG. The fixed electrode 5 and the relay terminal 26 are supported by a fixed insulating cylinder 42 made of a ceramic material via a fixed relay metal fitting 41. The fixed support fitting 43 that supports the other end of the fixed insulating cylinder 42 is fixed to the vacuum container by a brazing material. That is, the fixed insulating tube 42
A fixed relay metal fitting 41 and a fixed support metal fitting 43 are previously attached to both ends of the.

The movable electrode 7 is arranged between the grounding device 6 and the fixed electrode 5, and the movable electrode 7 is supported by a movable insulating cylinder 45 made of a ceramic material via a movable relay metal fitting 44. One end is supported by the movable support fitting 46 as in the above, and 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 container 4. The movable blade 30 is surrounded by an extendable movable bellows 48, one end of which is attached to the movable support fitting 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 spindle 49.
Is rotated in the direction of the arrow with the fulcrum as a fulcrum to contact and separate the grounding device 6 and the fixed electrode 5.

The tip of the movable blade 30 is driven by an operating mechanism (not shown) connected to the movable blade 30 to rotate the movable blade 30 about a main shaft 49 as a fulcrum. The operation shaft 50 connects the movable blade 30 and the operation mechanism section. It should be noted that the movable blade 30 may have a structure in which a movable electrode is simply provided at the tip thereof. In this case, any one of the movable blade and the operating mechanism section needs an insulating means for interrupting the voltage.

The tip of the movable electrode 7 and the load-side conductor 9 are connected by a flexible conductor 22. Load side conductor 9
Is connected to the cable head 10 through the load side bushing 21 made of a ceramic material. A load-side sealing metal fitting 53 is provided at the end of the load-side bushing 21, and the load-side sealing metal fitting 53 is welded to and supported by a brazing material around the opening formed in the vacuum container 4, and the outside of the vacuum container 4 and the cable. A ceramic surface of the load side bushing 21 exposed between the heads 10 is provided with a ground metal layer (not shown) ,
Leakage flow through the vacuum vessel 4 to so that is flow to the ground E,
Safety measures are taken to prevent danger even if an operator touches the area around the cable head 10.

Next, the operation of the phase switch gear will be described with reference to FIGS. The movable electrode 7 is disposed between the grounding device 6 and the fixed electrode 5 as shown in FIG.
And the disconnection position Y3, the movable electrode 7 is rotated from this position in the arrow direction X1 and the position where the movable electrode 7 contacts the ground electrode 39 is the ground position Y4 as shown in FIG. Is pressed by a spring 36 toward the movable electrode. In addition, the movable electrode 7 rotates in the arrow direction X2,
As shown in FIG. 3, the movable electrode 7 is in contact with the fixed electrode 5 and is also connected to the load-side conductor 9 at the closing position Y1.

At the loading position Y1, the movable electrode 7 is the fixed electrode 5
, And is 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 changed to that of the prior art. Compared with this, it is possible to greatly reduce the electric resistance, and the electric resistance is reduced, so that the power loss and the generated heat can be reduced accordingly.

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 will be directly on the load side. Sliding contact with the conductor 9 is conceivable. This means that the movable electrode 7 is in direct sliding contact with the load-side conductor 9 and the current continues to flow in the state where the movable electrode 7 and the load-side conductor 9 are in contact with each other, and this generated heat is generated in the vacuum inside the vacuum container 4. As a result, the movable electrode 7 and the load-side conductor 9 are easily welded. As a result, the welded movable electrode 7
In order to separate the load side conductor 9 from the load side conductor, it can be used at a minimum if the turning force of the operating mechanism is increased, but the operating mechanism cannot be increased in size, and the vacuum circuit breaker is increased in size and cost. Get high

Sliding in the generated heat causes severe wear and has a short life. Further, when the movable electrode 7 slides on the load-side conductor 9, the metal fine particles generated from the movable electrode 7 and the load-side conductor 9 diffuse and remain in the vacuum container, so that dielectric breakdown easily occurs. On the other hand, in the present invention, the movable electrode 7
Flexible conductor 22 in which the member does not slide directly on the load-side conductor 9
Since the load side conductor 9 and the movable electrode 7 are connected with each other, welding of the movable electrode 7 and the load side conductor 9 does not occur,
The turning force of the operating mechanism does not become larger than that described above, and the operating mechanism 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. The flexible conductor 22 connects between the load-side conductor 9 and the movable electrode 7, and the movable electrode 7 is connected to the movable electrode 7 as described above.
There can no that generates fine metal particles when sliding on the load side conductor 9, it is clear that the insulation performance is greatly improved Ri by the foregoing, this amount, it is possible to reduce the size of the vacuum chamber 4.

Further, the present invention can be used even if the grounding device and the disconnecting position are removed, and when removed, the vacuum container and the operating mechanism can be further miniaturized, so that the circuit switch gear can be naturally miniaturized . Further, when the movable electrode 7 arranged between the grounding device 6 and the fixed electrode 5 is arranged in line with the load side conductor 9 and the movable blade 30 , the flexible conductor 22 becomes the movable electrode 7 and the load side conductor 9. Also, since the cable heads 10 can be connected to each other at the shortest distance, the electric resistance is reduced, and the heat generated in the vacuum container can be reduced accordingly. Further, since the flexible conductor 22 is used, the movable electrode 7 can be rotated left and right while being electrically connected to the load side conductor 9.

Next, another embodiment will be described with reference to FIGS. A load-side common conductor 56 is mounted in the vacuum container 4 which is grounded . The load-side common conductor 56 is connected to the load-side conductor 9, and the ground-side contact 57 and the load-side contact 58 are mounted thereon. Ground movable electrode 59 and the movable electrode 7 is supported on the vacuum chamber 4 are arranged corresponding to the ground contact 57 and load side contact 58. When the movable electrode 7 is in contact with the load side contact 58, the ground movable electrode 5
9 is separated from the ground side contact 57, and the ground movable electrode 59 is
When it is in contact with the ground side contact 57, the movable electrode 7 is negative.
It is separated from the load side contact 58. Outside of both electrodes, multiple phases
Fixed electrode 5 and ground side conductor 37 connected to the busbar 8 of
Fixed electrode 5, movable electrode 7, and ground-side conductor
The flexible conductor 22 is provided between 37 and the movable ground electrode 59.
Connected by.

[0029] That is, in a closed state with the movable electrode 7 and the load side contact 5 8 are in contact, moves from the load side contact 58 of the movable electrode 7 upwards simultaneously, the ground-side contact ground movable electrode 59 moves downward 5 7 in contact with a ground state. Also,
The former changes from the closed state to the closed state. In this embodiment, the fixed electrode 5 connected to the busbars 8 of a plurality of phases is arranged in the direction perpendicular to the movable electrode 7 and the load side contact 58, that is, in the lateral direction.
It Between the fixed electrode 5 and the movable electrode 7, and the ground side conductor 37
It can also be used for a switchgear in which the flexible conductor 22 connects between the ground movable electrode 59 and the ground movable electrode 59 .

[0030]

According to the present invention described above, since the structure can be simplified and electric power can be supplied from the movable electrode to the load side conductor via the flexible conductor, the current path can be shortened significantly compared to the conventional one. The resistance is reduced ,
Power loss and heat generation can be reduced .

[Brief description of drawings]

FIG. 1 is a circuit diagram of a collective switchgear that is an embodiment of the present invention.

FIG. 2 is a circuit diagram showing the configuration of the circuit switchgear of FIG.

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

FIG. 4 is a front view of FIG. 2 seen from the left side.

5 is a plan view of the busbar connecting terminal plate shown in FIGS. 1 and 3. FIG.

FIG. 6 is a side sectional view of the circuit switchgear shown in FIG. 3 at a cutoff and disconnection position.

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

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

FIG. 9 is a side sectional view showing the configuration of a circuit switchgear that is another embodiment of the present invention.

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

[Explanation of symbols]

1-3 ... circuit switches, 2X, 2Y ... phase switch, 4 ...
Vacuum container, 5 ... Fixed electrode, 6 ... Grounding device, 7 ... Movable electrode, 8 ... Internal bus bar, 9 ... Load side conductor, 11 ... Power source side cable, 22 ... Flexible conductor, 30 ... Movable blade.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H02B 13/04 M (72) Inventor Ayumu Morita 7-2-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi, Ltd. Headquarters (72) Inventor Minoru Suzuki 1-1-1 Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Co., Ltd. Kokubun factory (56) References JP-A-9-153320 (JP, A) JP-A-8- 306269 (JP, A) JP-A-8-336214 (JP, A) JP-B-49-41903 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02B 13 / 02,13 / 075 H01H 35 / 66,33 / 42

Claims (2)

(57) [Claims] 1. A load side arranged in a grounded vacuum container.
Ground side contact and load side contact mounted on common conductor
And the movable electrode on the ground side that moves close to and away from both contacts
The electrode and the contact and separation direction of the movable electrode and the load side contact are
A solid wire that is placed at a right angle and is electrically connected to the busbar.
The constant electrode, the conductor on the ground side, the fixed electrode and the movable electrode are electrically charged.
That it has a flexible conductor that makes a physical connection.
Characteristic vacuum switch. 2. The vacuum switch according to claim 1 in a switchboard.
It is housed and movable via the movable blade.
The operation compartment that houses the operation mechanism that rotates the
The cable head connected to the load side conductor.
The operating compartment is equipped with a conductor compartment
Place the compartment on the upper depth side of the vacuum vessel,
Place the conductor compartment in front of the vacuum vessel.
Vacuum switchgear characterized by