Vacuum circuit breaker unit and vacuum circuit breaker

Abstract

The present invention relates to a vacuum interruption unit (1) of a vacuum circuit breaker (50). This vacuum interruption unit (1) includes one vacuum interruption valve (3), one insulating sleeve (5) that is cylindrically wound around the longitudinal axis of the vacuum interruption valve (3) and is made of an insulating material and surrounds the vacuum interruption valve (3), and a plurality of capacitor electrodes (7, 8, 9) incorporated within the insulating sleeve (5).

Description

Technical Field

[0001] The present invention relates to a vacuum interruption unit and a vacuum circuit breaker of a vacuum circuit breaker.

[0002] A vacuum circuit breaker is a power breaker in which a plurality of opening and closing contacts that can move relative to each other are arranged in a vacuum interruption valve (vacuum interruption chamber). Vacuum circuit breakers are particularly easy to maintain, durable, and easy to operate. To meet voltage requirements, a vacuum circuit breaker can have a plurality of vacuum interruption valves, and their opening and closing paths are electrically connected in series. In this case (when the opening and closing path of the vacuum interruption valve is open), in order to avoid overloading of individual vacuum interruption valves, it is necessary to apply a voltage distribution suitable for the vacuum interruption valve to these vacuum interruption valves. For example, when a plurality of vacuum interruption valves formed in the same manner are connected in series, it is required to perform as uniform a voltage distribution as possible to these vacuum interruption valves.

[0003] In order to perform a desired voltage distribution to a plurality of vacuum interruption valves, for example, passive electrical components such as a control capacitor and / or a control resistor are connected in parallel to the vacuum interruption valve. However, these components increase the installation space required for the vacuum circuit breaker. In particular, in the case of a vacuum circuit breaker having compressed air that has been cleaned and dehumidified as an insulating medium surrounding the vacuum interruption valve, and further having a conventional control capacitor, a relatively large insulation distance is required between the vacuum interruption valve and the control capacitor, and between the control capacitor and the metal breaker housing of the vacuum circuit breaker. This is because the insulation strength of compressed air is relatively low (compared to other insulating gases such as sulfur hexafluoride).

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to enable voltage control in a vacuum circuit breaker by a plurality of control capacitors that can be installed in a narrow space.

Means for Solving the Problems

[0005] This problem is solved by the present invention with a vacuum circuit breaker having the features of claim 1 and a vacuum circuit breaker having the features of claim 14.

[0006] An advantageous embodiment of the present invention is the subject matter of the dependent claims.

[0007] The vacuum circuit breaker unit according to the present invention includes one vacuum circuit breaker valve, one insulating sleeve that is cylindrical in shape around the long axis of the vacuum circuit breaker valve and is made of an insulating material, surrounding the vacuum circuit breaker valve, and a plurality of capacitor electrodes incorporated within the insulating sleeve.

[0008] Therefore, the vacuum shutoff unit according to the present invention has a number of capacitor electrodes incorporated within an insulating sleeve surrounding the vacuum shutoff valve, instead of a conventional single control capacitor or multiple such control capacitors. In other words, according to the present invention, the capacitance of a conventional set of control capacitors is divided among a number of capacitor electrodes incorporated within an insulating sleeve. As a result, the insulation distance from the vacuum shutoff valve and from the metal circuit breaker housing of the vacuum circuit breaker to the number of capacitor electrodes can be reduced compared to a conventional control capacitor, thereby saving installation space, especially when the circuit breaker housing is filled with cleaned and dehumidified compressed air as an insulating gas. Furthermore, this insulating sleeve advantageously acts as a solid insulator that enhances the effect of the insulating gas.

[0009] In one embodiment of the vacuum shutoff unit according to the present invention, a plurality of capacitor electrodes are arranged in a ring shape or partially in a ring shape around the long axis of the vacuum shutoff valve. This preferably achieves a uniform distribution of capacitance of the plurality of capacitor electrodes around the vacuum shutoff valve.

[0010] In another embodiment of the vacuum shutoff unit according to the present invention, a plurality of electrode pairs of capacitor electrodes are formed from a plurality of capacitor electrodes, each having opposing electrode surfaces and circulating concentrically. These electrode pairs of concentrically circulating capacitor electrodes are spaced apart from each other in the axial direction with respect to the long axis of the vacuum shutoff valve. For example, each electrode pair of the concentrically circulating capacitor electrodes is formed of one capacitor electrode circulating on the surface of an insulating sleeve facing the vacuum shutoff valve and one capacitor electrode circulating on the surface of an insulating sleeve on the opposite side of the vacuum shutoff valve. Here, the concentrically circulating capacitor electrodes are formed, for example, from a conductive coating layer attached to the insulating sleeve.

[0011] In the above-described embodiment of the present invention, at least a portion of the plurality of capacitor electrodes forms a plurality of ring-shaped or partially ring-shaped capacitors having a plurality of concentric electrode surfaces, and these capacitors are spaced apart from each other in the axial direction. By arranging the plurality of capacitor electrodes on both opposite surfaces of the insulating sleeve, the assembly of the plurality of capacitor electrodes into the insulating sleeve is advantageously and easily performed, especially when the plurality of capacitor electrodes are formed of a conductive coating layer.

[0012] In another embodiment of the vacuum shutoff unit according to the present invention, a plurality of capacitor electrodes orbit around an insulating sleeve, spaced apart from each other in the axial direction with respect to the long axis of the insulating sleeve, and having electrode surfaces facing each other. That is, in this embodiment of the vacuum shutoff unit according to the present invention, at least a portion of the plurality of capacitor electrodes form a plurality of capacitors having a plurality of electrode surfaces spaced apart from each other in the axial direction.

[0013] In another embodiment of the vacuum shutoff unit according to the present invention, multiple electrode pairs of capacitor electrodes form multiple capacitors by their opposing electrode surfaces, and these capacitors are connected in series by multiple electrical conductors incorporated within an insulating sleeve. That is, in this embodiment of the vacuum shutoff unit according to the present invention, in addition to the multiple capacitor electrodes, multiple electrical conductors are incorporated within an insulating sleeve, and these electrical conductors electrically connect the multiple capacitors formed by the multiple capacitor electrodes in series. Similarly, multiple capacitors formed by multiple capacitor electrodes can be connected in parallel by multiple electrical conductors incorporated within an insulating sleeve, particularly when the capacitor electrodes of these capacitors are partially formed in a ring shape.

[0014] In another embodiment of the vacuum interruption unit according to the present invention, at least one electrical resistor is incorporated within an insulating sleeve, and these electrical resistors are connected in series or in parallel with at least one capacitor formed of two capacitor electrodes by a plurality of electrical conductors incorporated within the insulating sleeve. That is, in this embodiment of the vacuum interruption unit according to the present invention, in addition to the plurality of capacitor electrodes, at least one electrical resistor is incorporated within an insulating sleeve and connected in series or in parallel with at least one of these capacitors.

[0015] In another embodiment of the vacuum shutoff unit according to the present invention, the vacuum shutoff valve has at least one shield electrode, which is conductively connected to and / or capacitively coupled to one capacitor electrode. That is, in this embodiment of the vacuum shutoff unit according to the present invention, a plurality of capacitor electrodes incorporated within an insulating sleeve are directly connected to and / or capacitively coupled to a potential applied to the shield electrode of the vacuum shutoff valve.

[0016] In another embodiment of the vacuum shutoff unit according to the present invention, the insulating sleeve is formed from a thermoplastic resin such as polyoxymethylene (POM), polyethylene terephthalate (PETP), polyvinylidene fluoride (PVDF), or polyamide (PA6.6), or from an epoxy resin having a dielectric constant increasing filler such as barium titanate (BaTiO3). In this embodiment of the vacuum shutoff unit according to the present invention, the insulating sleeve is manufactured by a conventional method, such as injection molding. This embodiment is suitable for easily assembling a plurality of capacitor electrodes within the insulating sleeve, for example, on its surface.

[0017] In an alternative embodiment of the vacuum shutoff unit according to the present invention, the insulating sleeve is formed together with the plurality of capacitor electrodes by 3D printing. For example, the insulating sleeve is printed from polylactide (PLA), acrylonitrile butadiene styrene copolymer (ABS), PVDF, or chlorinated polyethylene (CPE), and the plurality of capacitor electrodes are printed from conductive filament. In this embodiment of the vacuum shutoff unit according to the present invention, the insulating sleeve and the plurality of capacitor electrodes are manufactured together by 3D printing. This embodiment is suitable when the insulating sleeve and / or the plurality of capacitor electrodes have a geometrically complex structure, particularly when the plurality of capacitor electrodes are embedded within the insulating sleeve.

[0018] In another embodiment of the vacuum shutoff unit according to the present invention, at least one area of ​​the surface of the vacuum shutoff valve facing the insulating sleeve, and / or at least one area of ​​the surface of the insulating sleeve facing the vacuum shutoff valve, is covered, and this covering makes the electric field between the insulating sleeve and the vacuum shutoff valve uniform. Such a covering is formed from, for example, a semiconductor material. This embodiment of the vacuum shutoff unit according to the present invention makes it possible to avoid, or at least reduce, partial discharge between the insulating sleeve and the vacuum shutoff valve.

[0019] In another embodiment of the vacuum shutoff unit according to the present invention, the insulating sleeve is composed of at least two sleeve components. This embodiment of the vacuum shutoff unit according to the present invention is advantageous when the outer diameter of the vacuum shutoff valve varies along its long axis. In this case, by constructing the insulating sleeve with multiple sleeve components, it becomes possible to assemble an insulating sleeve having a geometric shape that conforms to the shape of the vacuum shutoff valve.

[0020] The vacuum circuit breaker according to the present invention comprises at least one vacuum interruption unit according to the present invention. In particular, this vacuum circuit breaker may have a plurality of vacuum interruption units according to the present invention in which the switching circuits are electrically connected in series. As already mentioned above, in the case of a vacuum circuit breaker having a plurality of vacuum interruption valves in which the switching circuits are electrically connected in series, voltage distribution to the plurality of vacuum interruption valves is important, thereby preventing overloading of individual vacuum interruption valves. Therefore, the vacuum interruption unit according to the present invention is particularly suitable for such a vacuum circuit breaker having a plurality of vacuum interruption valves.

[0021] The above-mentioned characteristics, features, and advantages of the present invention, as well as the methods by which they are achieved, will be described in more detail, along with the drawings, to allow for a clearer understanding of the following embodiments. [Brief explanation of the drawing]

[0022] [Figure 1] Cross-sectional view of the first embodiment of the vacuum shutoff unit. [Figure 2] Cross-sectional view of a second embodiment of the vacuum shutoff unit. [Figure 3] Cross-sectional view of a third embodiment of a vacuum shutoff unit. [Figure 4] Cross-sectional view of a fourth embodiment of the vacuum shutoff unit. [Figure 5] Block diagram of a vacuum circuit breaker equipped with two vacuum interruption units. Corresponding components are denoted by the same reference numeral in the diagram. [Modes for carrying out the invention]

[0023] Figure 1 (FIG1) is a cross-sectional view of a first embodiment of a vacuum interruption unit 1 according to the present invention of a vacuum circuit breaker. This vacuum interruption unit 1 includes one vacuum interruption valve 3, one insulating sleeve 5 surrounding this vacuum interruption valve 3, and a plurality of capacitor electrodes 7, 8 incorporated in the insulating sleeve 5.

[0024] This vacuum interruption valve 3 has one interruption valve housing, and this interruption valve housing is formed of one central region 13 made of metal, two end regions 15, 17 made of metal, and two insulating regions 19, 21. The central region 13 has a larger diameter than the end regions 15, 17 and the insulating regions 19, 21, and is disposed between the insulating regions 19, 21. The insulating regions 19, 21 are each formed of a non-conductive material, for example, a ceramic material. In the illustrated embodiment, each insulating region 19, 21 is composed of three ring-shaped insulating segments 23. The end regions 15, 17 form the end faces of the interruption valve housing facing each other.

[0025] Furthermore, the vacuum interruption valve 3 has two electrically conductive opening and closing contacts 25, 27. Here, the first opening and closing contact 25 is fixedly connected to the first end region 15 of the interruption valve housing and extends into the central region 13 of the interruption valve housing through the first insulating region 19. The second opening and closing contact 27 is movable with respect to the first opening and closing contact 25 by a mechanism not shown between a first opening and closing position where the opening and closing contacts 25, 27 contact each other and a second opening and closing position shown in FIG. 1 where the opening and closing contacts 25, 27 are separated from each other. The second opening and closing contact 27 is drawn out from the interruption valve housing through an opening in the second end region 17 and protrudes into the central region 13 of the interruption valve housing through the second insulating region 21. One end of a metal bellows 29 is attached to the second opening and closing contact 27, and the other end of the metal bellows 29 is connected to the second end region 17 of the interruption valve housing and surrounds the second opening and closing contact 27 between its both ends.

[0026] Furthermore, the vacuum shut-off valve 3 has a plurality of shield electrodes 31 to 34. The first shield electrode 31 is located in the first end region 15 of the shut-off valve housing and protrudes from the first end region 15 into the interior of the shut-off valve housing, where it surrounds the first on / off contact 25 in a ring shape. The second shield electrode 32 is located at the end of the central region 13 of the shut-off valve housing on the side of the first end region 15, where it surrounds the first on / off contact 25 in a ring shape.

[0027] The third shield electrode 33 is located in the second end region 17 of the shut-off valve housing, protruding from the second end region 17 into the interior of the shut-off valve housing, where it surrounds the second on / off contact 27 and the bellows 29 in a ring shape. The fourth shield electrode 34 is located at the end of the central region 13 of the shut-off valve housing on the side of the second end region 17, where it surrounds the second on / off contact 25 in a ring shape.

[0028] The inner surface of the central region 13 of the shut-off valve housing and the shield electrodes 32 and 34 form a vapor shield, which absorbs material evaporating from the switching contacts 25 and 27, preventing this material from accumulating on the inner walls of the insulating regions 19 and 21 and impairing their electrical insulation effect.

[0029] The insulating sleeve 5 extends cylindrically around the long axis 37 of the vacuum shut-off valve 3. This insulating sleeve 5 is composed of two sleeve components 5.1 and 5.2. The first sleeve component 5.1 orbits the first insulating region 19 and the first portion of the central region 13 of the shut-off valve housing. The second sleeve component 5.2 orbits the second insulating region 21 of the shut-off valve housing and the second portion of the central region 13. During the manufacture of the vacuum shut-off unit 1, the first sleeve component 5.1 is pushed out onto the shut-off valve housing from the side of the first end region 15, and the second sleeve component 5.2 is pushed out onto the shut-off valve housing from the side of the second end region 17.

[0030] Each capacitor electrode 7, 8 is embedded inside the insulating sleeve 5, i.e., within the insulating sleeve 5, and is arranged in a ring shape around the long axis 37. In this embodiment of capacitor electrodes 7, 8, the six electrode pairs 41-46 of the concentrically circulating capacitor electrodes 7, 8 are formed with opposing electrode surfaces. Therefore, each electrode pair 41-46 has an inner capacitor electrode 7 and an outer capacitor electrode 8 that surrounds and circulates the inner capacitor electrode 7. The electrode pairs 41-46 are spaced apart from each other axially with respect to the long axis 37, with three electrode pairs 41-43 surrounding a first insulating region 19, and three more electrode pairs 44-46 surrounding a second insulating region 21.

[0031] The outer capacitor electrodes 8 of the first electrode pair 41 and the second electrode pair 42 are electrically connected to each other by an electrical conductor 47 incorporated within the insulating sleeve 5. Similarly, the inner capacitor electrodes 7 of the second electrode pair 42 and the third electrode pair 43 are electrically connected to each other, and thus the electrode pairs 41-43 form a plurality of capacitors electrically connected in series. Furthermore, similar to the embodiment shown in Figure 3, a plurality of electrical resistors 49 incorporated within the insulating sleeve 5 can be connected between these capacitors and / or in parallel with these capacitors.

[0032] Furthermore, the inner capacitor electrode 7 of the first electrode pair 41 is conductively connected to the first end region 15 of the shut-off valve housing, and the outer capacitor electrode 8 of the third electrode pair 43 is conductively connected to the central region 13 of the shut-off valve housing. Instead of this conductive connection, these capacitor electrodes 7 and 8 can also be simply capacitively coupled to the potentials applied to the first end region 15 and the central region 13, respectively.

[0033] Correspondingly, the outer capacitor electrodes 8 of the fourth electrode pair 44 and the fifth electrode pair 45, and the inner capacitor electrodes 7 of the fifth electrode pair 45 and the sixth electrode pair 46 are electrically connected to each other, and thus the electrode pairs 44-46 also form a plurality of electrically series-connected capacitors. A plurality of electrical resistors 49, incorporated within the insulating sleeve 5, can also be connected between these capacitors and / or in parallel with these capacitors.

[0034] Furthermore, the inner capacitor electrode 7 of the fourth electrode pair 44 is conductively connected to the second end region 17 of the shut-off valve housing, and the outer capacitor electrode 8 of the sixth electrode pair 46 is conductively connected to the central region 13 of the shut-off valve housing. Here again, instead of conductive connections, these capacitor electrodes 7 and 8 could simply be capacitively coupled to the potentials applied to the second end region 17 and the central region 13, respectively.

[0035] The sleeve components 5.1 and 5.2 of the insulating sleeve 5 are manufactured, for example, by 3D printing, together with the capacitor electrodes 7 and 8, the electrical conductor 47, and optionally the electrical resistor 49, which are each incorporated within the sleeve. In this case, the sleeve components 5.1 and 5.2 are printed using materials such as PLA, ABS, PVDF, or CPE, while the capacitor electrodes 7 and 8, the electrical conductor 47, and optionally the electrical resistor 49 are printed using conductive filament.

[0036] The interaction between capacitor electrodes 7 and 8 enables the realization of a controllable capacitance in the range of, for example, 10 pF to 500 pF.

[0037] Figure 2 (FIG2) is a cross-sectional view of a second embodiment of the vacuum shutoff unit 1 according to the present invention. This vacuum shutoff unit 1 also includes one vacuum shutoff valve 3, one insulating sleeve 5 surrounding the vacuum shutoff valve 3, and a plurality of capacitor electrodes 7, 8 incorporated within the insulating sleeve 5. The only substantially different aspects of the embodiment of the vacuum shutoff unit 1 according to the present invention shown in Figure 2 from the embodiment shown in Figure 1 are the arrangement of the capacitor electrodes 7, 8 and the electrical coupling between them and the shield electrodes 31-35 of the vacuum shutoff valve 3, where the vacuum shutoff valve 3 has a further plurality of shield electrodes 35 in addition to the shield electrodes 31-34 of the embodiment shown in Figure 1, and these shield electrodes each orbit in a ring shape between two adjacent insulating segments 23 of the insulating regions 19, 21 of the shutoff valve housing.

[0038] The capacitor electrodes 7 and 8 here also form electrode pairs 41 to 46, and the capacitor electrodes 7 and 8 of each electrode pair 41 to 46 are concentrically arranged and have electrode surfaces facing each other. However, unlike the embodiment shown in Figure 1, the capacitor electrodes 7 and 8 are not located inside the insulating sleeve 5, that is, they are not embedded in the insulating sleeve 5. The inner capacitor electrode 7 extends in a ring shape around the long axis 37 on the surface of the insulating sleeve 5 on the side facing the vacuum shut-off valve 3, and the outer capacitor electrode 8 extends in a ring shape around the long axis 37 on the surface of the insulating sleeve 5 on the side facing the vacuum shut-off valve 3. Furthermore, unlike the embodiment shown in Figure 1, the capacitor electrodes 7 and 8 are not connected to each other by an electrical conductor 47. Instead, the multiple inner capacitor electrodes 7 of electrode pairs 42, 43, 45, and 46 are each electrically connected to a shield electrode 35 located between two adjacent insulating segments 23.

[0039] Furthermore, the surface area of ​​the insulating sleeve 5 not covered by the capacitor electrode 7 (the area on the vacuum shut-off valve 3 side), and the surface area of ​​the vacuum shut-off valve 3 on the opposite side (the area on the insulating sleeve 5 side), can have a coating 48 containing, for example, a semiconducting material. These coatings equalize the electric field in the space between the insulating sleeve 5 and the vacuum shut-off valve 3. Such coatings 48 can also be provided in the embodiments shown in Figures 1, 3, or 4.

[0040] The sleeve components 5.1 and 5.2 of the insulating sleeve 5 of the vacuum shutoff unit 1 shown in Figure 2 are manufactured using conventional methods such as injection molding, from thermoplastic resins such as POM, PETP, PVDF, or PA6.6, or from epoxy resins having a dielectric constant increasing filler such as barium titanate (BaTiO3). Subsequently, capacitor electrodes 7 and 8 are attached to the insulating sleeve 5, for example, as metal electrodes or as a conductive coating layer.

[0041] Figure 3 (FIG3) is a cross-sectional view of a third embodiment of the vacuum shutoff unit 1. This vacuum shutoff unit 1 comprises one vacuum shutoff valve 3, one insulating sleeve 5 surrounding the vacuum shutoff valve 3, and a plurality of capacitor electrodes 9 incorporated within the insulating sleeve 5. The vacuum shutoff valve 3 and the insulating sleeve 5 are formed as shown in the embodiment in Figure 1, so they will not be described again here.

[0042] Each capacitor electrode 9 is embedded inside the insulating sleeve 5, i.e., within the insulating sleeve 5, and is arranged in a ring shape around the long axis 37. In each sleeve component 5.1, 5.2 of the insulating sleeve 5, six capacitor electrodes 9 are arranged axially spaced apart from each other with respect to the long axis 37, forming three electrode pairs 41, 42, 43 and 44, 45, 46, respectively, which form multiple capacitors electrically connected in series by electrical conductors 47 incorporated within the sleeve components 5.1, 5.2. Furthermore, multiple electrical resistors 49 incorporated within the insulating sleeve 5 can be connected between these capacitors and / or in parallel with these capacitors.

[0043] Furthermore, each end region 15, 17 of the shut-off valve housing is electrically connected to the nearest capacitor electrode 9, and each end of the central region 13 of the shut-off valve housing on the end region 15, 17 side is electrically connected to the nearest capacitor electrode 9. Similar to the embodiment shown in Figure 1, the conductive connection between the end region 15, 17 and the central region 13 of the shut-off valve housing and the capacitor electrode 9 can be discontinued, and in that case, these capacitor electrodes 9 are replaced by simple capacitive coupling with the respective potentials applied to the end region 15, 17 and the central region 13.

[0044] Therefore, the only substantial difference between the embodiment of the vacuum shutoff unit 1 shown in Figure 3 and the embodiment shown in Figure 1 is that the two capacitor electrodes 9 of each electrode pair 41-46 are not arranged concentrically, but rather have electrode surfaces that face each other in the axial direction and are spaced apart from each other in the axial direction. As in the embodiment shown in Figure 1, the sleeve components 5.1 and 5.2 of the insulating sleeve 5 are manufactured, for example, by 3D printing, together with the capacitor electrodes 9, the electrical conductors 47, and optionally, the electrical resistors 49 incorporated within the sleeve components 5.1 and 5.2.

[0045] Figure 4 (FIG4) is a cross-sectional view of a fourth embodiment of the vacuum shutoff unit 1. This embodiment differs substantially from the embodiment shown in Figure 3 in the number and spacing of the multiple capacitor electrodes 9 incorporated within the sleeve components 5.1, 5.2, and in that none of the capacitor electrodes 9 are electrically conductively connected to each other by the electrical conductors 47 incorporated within the insulating sleeve 5. Thus, the electrical coupling of the multiple capacitor electrodes 9 here is solely capacitive, in which case one capacitor electrode 9 placed between two other capacitor electrodes 9 forms a capacitor with each of these two adjacent capacitor electrodes 9.

[0046] Figure 5 (FIG5) shows a block diagram of a vacuum circuit breaker 50 according to the present invention. This vacuum circuit breaker 50 has one circuit breaker housing 51, and two vacuum circuit breaker units 1, formed as any of the vacuum circuit breaker units 1 shown in Figures 1 to 4, are arranged inside this circuit breaker housing, and their switching circuits 52 and 53 are electrically connected in series. The circuit breaker housing 51 is filled with, for example, cleaned and dehumidified compressed air. Multiple movable switching contacts 27 of these vacuum circuit breaker units 1 can be driven synchronously, for example, by a common circuit breaker drive (not shown) to open and close the switching circuits 52 and 53.

[0047] Although the present invention has been illustrated and described in detail with respect to several preferred embodiments, the present invention is not limited to the disclosed embodiments, and other modifications can be derived therefrom by those skilled in the art without departing from the scope of protection of the present invention.

Claims

1. A method for manufacturing a vacuum circuit breaker (50) vacuum circuit breaker unit (1), The vacuum shutoff unit (1) Vacuum shutoff valve (3), The vacuum shut-off valve (3) has a cylindrical shape that circulates around its long axis (37), is made of insulating material, and has one insulating sleeve (5) that surrounds the vacuum shut-off valve (3), Multiple capacitor electrodes (7, 8, 9) are incorporated within the insulating sleeve (5), Includes, A method for manufacturing a vacuum shutoff unit (1), characterized in that the insulating sleeve (5) is manufactured together with the plurality of capacitor electrodes (7, 8, 9) by 3D printing.

2. At least one area of ​​the surface of the vacuum shut-off valve (3) facing the insulating sleeve (5), and / or at least one area of ​​the surface of the insulating sleeve (5) facing the vacuum shut-off valve (3) has a covering (48), The method for manufacturing a vacuum shutoff unit (1) according to claim 1, characterized in that the covering (48) equalizes the electric field between the insulating sleeve (5) and the vacuum shutoff valve (3).

3. The method for manufacturing a vacuum shutoff unit (1) according to claim 1, characterized in that the insulating sleeve (5) is composed of at least two sleeve components (5.1, 5.2).

4. A vacuum circuit breaker (50) comprising at least one vacuum circuit breaker (1) formed by the manufacturing method described in any one of claims 1 to 3.

5. A vacuum circuit breaker (50) comprising a plurality of vacuum circuit breaker units (1), each formed by a manufacturing method described in any one of claims 1 to 3, wherein the switching paths of these units are electrically connected in series.

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