JP2001297665A - Multifunctional vacuum valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multifunctional vacuum valve, capable of making the overall equipment shape malle as a whole by providing the second electrode, for example, a ground electrode for multifunctional operation in addition to the switching function of the vacuum valve between main electrodes. SOLUTION: A pair of main electrodes 13, 14 and are approachable or separable with respect to each other are provided in an insulating container 10, constituting a vacuum container. The first opening operation of the main electrodes 13, 14 in the closed condition performs shutoff, and the second opening operation for further opening operation causes the movement of an electrode plate provided on the movable main electrode 14, and an electrode panel is put in contact with an intermediate electrode 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-function vacuum valve in which a high-voltage circuit is opened / closed and a function such as a grounding operation is added in addition to the opening / closing operation.

[0002]

2. Description of the Related Art A large number of vacuum valves are used for circuit breakers in a medium voltage circuit having a rated voltage of 33 kV or less. FIG. 6 shows a typical configuration of this vacuum valve. A pair of electrodes 4 are attached to the fixed shaft 2 and the movable shaft 3 of the vacuum valve 1 at their ends, and these are housed in a high vacuum insulating container 5 made of, for example, ceramic. Flanges 6 are attached to the upper and lower sides of the insulating container 5 by silver brazing, the fixed shaft 2 is fixed on the fixed shaft 2 side, and the movable shaft 3 is movably supported on the movable shaft 3 side via a telescopic bellows 7. I have. In some vacuum valves, the inside of the insulating container 5 has a high dielectric strength at a high vacuum, but the outside is exposed to a general aerial atmosphere, which is a weak point for insulation. In some cases, the body 8 is molded and attached. The surface of the insulating container 5 is apparently elongated by the insulator 8, and external insulation is reinforced.

[0003]

In such a configuration, the vacuum valve 1 is turned on and off, ie, energized and de-energized, by opening and closing the pair of electrodes 4. When a general power supply system is configured using the vacuum valve 1, a disconnecting device for disconnecting a circuit and a grounding device to be operated at the time of inspection and the like are required in addition to the vacuum valve 1. Therefore, when these electric devices are connected, the overall size naturally increases. Recently, although miniaturization of each electric device has been attempted, there is a limit to miniaturization of the entire device constituting the power supply system. This goes against the recent trend of downsizing electrical equipment. The present invention has been made in view of the above points, and in addition to the opening / closing function between main electrodes as a vacuum valve, for example, a second electrode such as a ground electrode is provided so as to be multifunctional to reduce the overall shape of the device. It is an object of the present invention to obtain a multifunctional vacuum valve that can be used.

[0004]

In order to achieve the above object, the invention according to claim 1 is provided in an insulating container having a vacuum inside and opposed to the respective electrode shafts so as to contact and separate from each other in the axial direction. A pair of main electrodes, an intermediate electrode provided at an axially intermediate portion of the insulating container and electrically led out of the insulating container, and provided on one of the main electrodes and operated by axial movement of the main electrode. An electrode plate, wherein the first operation of the electrode axis of the main electrode provided with the electrode plate brings the main electrodes into and out of contact with each other, and the second operation makes the electrode plate of the main electrode provided with the electrode plate an intermediate electrode. Is characterized by being brought into contact with. Therefore,
According to the first aspect of the present invention, the electric device is obtained by combining a circuit breaker that constitutes a switching device of a power supply system with one vacuum valve and, for example, a grounding device, so that the overall shape can be reduced. In the invention according to claim 2, the intermediate electrode is a ground electrode. Claim 3
The described invention is characterized in that the electrode plate is constituted by a plurality of unit electrode plates arranged on the outer periphery of the main electrode. Therefore, in the third aspect of the invention, the contact resistance can be reduced and the current carrying capacity can be increased. According to a fourth aspect of the present invention, the facing surfaces of the pair of main electrodes are characterized in that one main electrode has a conical convex shape and the other main electrode has a conical concave shape.

Therefore, according to the invention of claim 4, even if the gap between the main electrodes increases, it is possible to prevent the electrode axis from being displaced at the time of contact. According to a fifth aspect of the present invention, there is provided a pair of main electrodes provided opposite to each of the electrode shafts such that the insides thereof come into contact with and separate from each other in the axial direction in a vacuum insulated container, and at an axially intermediate portion of the insulated container. An intermediate electrode that is provided and is electrically led out of the insulating container, an intermediate shield disposed in the insulating container so as to surround the main electrode in a closed state of the pair of main electrodes, and one of the main electrodes. An electrode plate that is provided in accordance with the axial movement of the main electrode, and separates the main electrodes by a first operation of the electrode axis of the main electrode provided with the electrode plate,
The second operation is such that the electrode plate of the main electrode provided with the electrode plate is brought into contact with the intermediate electrode. According to the fifth aspect of the present invention, coordination of insulation can be achieved in external insulation of the insulating container. The invention according to claim 6 is characterized in that a pair of main electrodes provided opposite to the respective electrode shafts so that the insides thereof come into contact with and separate from each other in the axial direction in a vacuum insulating container, and an intermediate portion in the axial direction of the insulating container. A main electrode comprising: an intermediate electrode provided and electrically led out of the insulating container; and an electrode plate provided on one of the main electrodes and operated in accordance with the axial movement of the main electrode. The first operation of the electrode shaft of the first embodiment causes the main electrodes to contact and separate from each other, and the second operation causes the electrode plate of the main electrode provided with the electrode plate to come into contact with the intermediate electrode. It is characterized by being connected to an electric circuit different from the pair of main electrodes.

Therefore, according to the invention of claim 6, if the movable electrode side is the load side, the power supply on the load side is divided into two systems: a power supply on the fixed side of the main electrode and an electric circuit connected to the intermediate electrode. Switching can be used.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows an opening / closing operation in which a multi-functional vacuum valve is opened and closed between a pair of movable and fixed main electrodes and a movable main electrode and a ground electrode. Is shown. A plurality of cylindrical insulating containers 10a, 10b, 10c
A fixed shaft 11 and a movable shaft 1 are placed in an insulating container 10 composed of
2 are arranged on the same axis, and a fixed main electrode 13 and a movable main electrode 14 which can be brought into contact with and separated from each other are attached to opposite ends of these axes. The surface of the fixed main electrode 13 facing the movable main electrode 14 is formed in a conical convex shape.
The facing surface is formed in a concave shape. Fixed shaft 11 is flange 1
5a, the movable shaft 12 is movably supported via a flange 15b and a bellows 16, and the insulating container 1
The inside of 0 is kept in a vacuum. An intermediate shield 17 supported between the joints of the insulating containers 10a and 10b surrounds the fixed main electrode 13 and the movable main electrode 14. Insulated containers 10b and 10
The ground electrode 18 is arranged and fixed between the c-joints. Reference numeral 18a is a ground electrode terminal. One end of flange 1 in insulating container 10
5b, an electrode tube 19 whose other end extends to near the rear surface of the movable main electrode 14 is arranged. A plurality of slits, which will be described in detail later, are provided at the tip of the electrode tube 19.

Next, details of each section will be described. A ground electrode plate 21 constituted by arranging a plurality of unit electrode plates 20 having a substantially L-shaped cross section as shown in detail in FIGS. 2 and 3 is arranged on the outer peripheral portion in the axial direction of the main electrode 14. That is, a step portion 14 a for housing and disposing the spring 22 is formed on the outer peripheral portion in the axial direction of the movable main electrode 14. Further, a plurality of spring supporting projections 14b extending in the radial direction below the outer peripheral portion in the axial direction are provided apart from each other in the circumferential direction. In the embodiment, three are provided. The arc-shaped pin 23 is inserted between the spring supporting projections 14b by the substantially L
The unit electrode plate 20 is rotatably inserted into a pin hole provided at a bent portion of the unit electrode plate 20 and attached. Thus, the spring 22 is housed and arranged in a space surrounded by the unit electrode plate 20 and the step portion 14a. And the spring supporting projection 14
As shown in FIG. 4, a slit 19a at the tip of the electrode tube 19 is located so as to oppose b. That is, the three slits are opposed to the respective spring supporting protrusions 14b, and the spring supporting protrusions 14b enter the slits 19a when the movable main electrode 14 is moved to a position where it is grounded. ing. The spring supporting projection 14b has a slit 19a.
The projections 19b on both sides of the slit come into contact with the bottom 20a of the L-shaped unit electrode plate 20 when the unit electrode plate 20 enters the unit electrode. become.

The movable shaft 12 is driven by a first operation of the operating mechanism from a state where the main electrodes 13 and 1 are not inserted between the main electrodes 13 and 1 (not shown).
The gap between the four is opened as shown in FIG. FIG. 5 shows a ground contact state in which the movable shaft 12 has been moved by the second operation of the operation mechanism.
When the bottom 20a of the unit electrode plate 20 constituting the ground electrode plate 21 provided on the movable main electrode 14 abuts on the projection 19b of the electrode tube 19, and when the movement of the movable shaft 12 is further advanced, the bottom 20a of the unit electrode plate The free end is expanded in the circumferential direction while compressing the spring 22 as a fulcrum. Then, the free end of the unit electrode plate 20 comes into contact with the ground electrode 18, and grounding is performed. When the movable shaft 12 is moved by the closing operation between the main electrodes, the electrode cylinder 19 is moved.
The contact between the projection 19b and the bottom 21a of the unit electrode plate 20 is released, and the free end of the unit electrode plate 20 is separated from the ground electrode by the repulsive force of the spring 22, and is located on the outer peripheral portion of the movable main electrode 14. As described above, according to the present invention, the function of the circuit breaker by opening and closing the main electrodes 13 and 14 and the function of the grounding device by contact and separation between the ground electrode plate 21 provided on the movable main electrode 14 and the ground electrode 18 are integrated. Can be. These opening and closing are linear operations, and two functions can be performed by one vacuum valve with little loss in transmitting the operating force. By forming the ground electrode plate 21 with a plurality of unit electrode plates 20, the number of points of contact with the ground electrode 18 is increased, and the capacity of the main circuit for supplying a ground current such as a charging current can be increased.

On the other hand, outside the insulated container 10, both ends of the fixed and movable shafts 11 and 12 are at 100% of the main circuit potential, but the intermediate shield 17 and the ground electrode 18 at the ground potential are provided between them. When the main electrodes 13 and 14 are opened, a ground potential exists between the poles. By the way, as compared with the vacuum state inside the insulating container, the aerial insulation lowers the dielectric strength depending on the environment. However, according to the configuration of the present invention, the main circuit potential is always between the electrodes via the ground potential, so the dielectric strength is lower. The distance between the poles is much higher than that between the ground, and insulation can be emphasized. Further, by forming the contact surfaces of the pair of main electrodes into a conical convex and concave shape, the contact area can be made larger than that of a flat plate type electrode as compared with an electrode having the same outer diameter, and the energizing current can be increased. In the two-stage operation, the gap between the main electrodes is increased to, for example, about 20 mm in a 24 kV class, and it is necessary to suppress the lateral vibration of the movable shaft 12. However, the axial vibration can be suppressed by the uneven contact. (Second Embodiment) Hereinafter, a second embodiment of the present invention will be described. In the first embodiment, the ground electrode is arranged at the joint of the insulating container.
If an electric circuit of another system (not shown) is connected instead of the terminal of the ground electrode, the main circuit power supply on the movable side can be switched. That is, it is possible to switch the two systems of the main circuit power supply using the movable side and the ground electrode from the main circuit power supply on the movable side and the fixed side. Thus, the overall shape of the electric device can be reduced by increasing the functions of the vacuum valve.

[0011]

As described above, according to the present invention, a pair of main electrodes which can be brought into contact with and separated from each other are provided in an insulating container constituting a vacuum container, and the first electrode opening operation of the main electrode in a closed state is performed. The electrode plate provided on the main electrode on the movable side is moved by the second opening operation where the opening operation is further advanced, and the electrode plate is brought into contact with the intermediate electrode. Since the shape can be formed, the overall shape of the power supply system can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first opening state of a multifunction vacuum valve according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an electrode plate mounting state in FIG. 1;

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a perspective view of an electrode tube provided on a movable shaft side in the multifunctional vacuum valve according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing a contact state with an intermediate electrode in a second opened state in the multifunctional vacuum valve according to the first embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a conventional vacuum valve.

[Explanation of symbols]

10: insulating container, 11: fixed shaft, 12: movable shaft, 1
3 fixed main electrode 14 ... movable main electrode, 15a, 15b ... flange, 18
... ground (intermediate) electrode 19 ... electrode cylinder, 19a ... slit, 19b ... projection,
Reference numeral 20: unit electrode plate 21a: bottom part, A21: ground electrode plate, 22: spring, 2
3 ... Pin

Claims (6)

[Claims] 1. A pair of main electrodes provided inside a vacuum insulated container so as to be opposed to and separated from each other in an axial direction in an axial direction, and a pair of main electrodes provided at an axially intermediate portion of the insulated container. An intermediate electrode electrically led out of the container, and an electrode plate provided on one of the main electrodes and operated by axial movement of the main electrode, the electrode axis of the main electrode provided with the electrode plate A multi-function vacuum valve in which the main electrodes are brought into contact with and separated from each other by a first operation, and an electrode plate of the main electrode provided with the electrode plate is brought into contact with an intermediate electrode by a second operation. 2. The multifunctional vacuum valve according to claim 1, wherein the intermediate electrode is a ground electrode. 3. The multi-function vacuum valve according to claim 1, wherein the electrode plate is constituted by a plurality of unit electrode plates arranged on the outer periphery of the main electrode. 4. The multi-function vacuum valve according to claim 1, wherein the pair of main electrodes have opposing surfaces, one main electrode having a conical convex shape and the other main electrode having a conical concave shape. 5. A pair of main electrodes provided inside a vacuum insulated container so as to be opposed to and separated from each other in an axial direction so as to be in contact with each other in an axial direction, and an insulating member provided at an axially intermediate portion of said insulated container. An intermediate electrode electrically led out of the container, an intermediate shield disposed in an insulating container so as to surround the main electrode in a closed state of the pair of main electrodes, and provided on one of the main electrodes. An electrode plate that operates by moving the main electrode in the axial direction; the first operation of the electrode axis of the main electrode provided with the electrode plate brings the main electrodes into and out of contact with each other; and the second operation includes the electrode plate. A multifunctional vacuum valve in which an electrode plate of a main electrode is brought into contact with an intermediate electrode. 6. A pair of main electrodes provided inside a vacuum insulating container so as to be opposed to and separated from each other in an axial direction in an axial direction, and an insulating member provided at an axially intermediate portion of the insulating container. An intermediate electrode electrically led out of the container, and an electrode plate provided on one of the main electrodes and operated by axial movement of the main electrode, the electrode axis of the main electrode provided with the electrode plate The first operation separates the main electrodes from each other, and the second operation brings the electrode plate of the main electrode provided with the electrode plate into contact with the intermediate electrode. A multi-function vacuum valve characterized in that it is connected to an electric circuit different from the above.