JP7567045B2 - High-voltage circuit breaker with contact sleeve and method for manufacturing the same - Google Patents

Description

The present invention relates to a high-voltage circuit breaker having at least one vacuum shutoff valve supported by at least one holder of the high-voltage circuit breaker, and a method for manufacturing the high-voltage circuit breaker, in which the vacuum shutoff valve has at least two contacts, which are coupled to at least one holder.

The high-voltage circuit breaker is designed to switch voltages in the voltage range up to 1200 kV and current range up to several thousand amperes. It comprises, for example, a housing with at least one switching contact on a support. The housing is, for example, an insulator, in particular made of ceramic, silicone and/or composite material, which is, for example, a cylindrical hollow body, in particular provided with a number of umbrella-shaped ribs on the outer periphery in order to extend the creepage current. In contrast to the insulator-type high-voltage circuit breaker, the tank-type high-voltage circuit breaker has a grounded housing, which is, for example, a hollow cylindrical metal tank, in whose interior at least one switching contact is arranged.

The switching contacts include at least two contacts, for example one fixed contact and one movable contact, which are made of a conductive material, for example steel, aluminum and/or copper. Alternatively or additionally, a switching contact can include, for example, at least two movable contacts. In this case, an embodiment with two movable contacts is similar to the one fixed contact and one movable contact of the present invention and will not be described further below for the sake of simplicity. The contacts of the switching contacts are arranged in the high-voltage circuit breaker or are supported by a number of holders, in particular movably or fixedly supported, and in particular hermetically sealed by a housing.

The housing is filled with an insulating or interrupting gas, in particular _SF6 and/or clean air. These switching contacts, which include, for example, rated current contacts and/or arcing contacts, are electrically insulated by the interrupting gas from certain devices and surroundings of the high-voltage circuit breaker, such as the drive device. Interrupting gases, such as _SF6, can be harmful to the climate and/or contain toxic components. To prevent the interrupting gas from escaping from the high-voltage circuit breaker, a gas-tight and permanent seal of the housing is necessary, which is complex, expensive and costly. The environmentally friendly disposal of the interrupting gas, in particular, at the end of the life of the high-voltage circuit breaker, is also complex and costly. An environmentally friendly alternative is to use a vacuum valve in the typical housing described above.

The use of the exemplary housing as described above allows for simple and cost-effective replacement of high voltage circuit breakers in power systems, and particularly simple and cost-effective manufacture of large numbers of high voltage circuit breakers. In order to replace environmentally harmful interrupting gases, such as _SF6 , with environmentally friendly interrupting gases, such as clean air, i.e., air that is dried and purified, it is necessary to replace the rated current system and the arcing contact system with a vacuum interrupter in order to maintain the required insulation distance in the exemplary housing.

The vacuum shutoff valve is arranged and connected in a mechanically stable and electrically conducting manner between at least two external electrical connections inside the housing, where the electrical connections are formed, for example, in the form of connection terminals for the connection of high-voltage cables, generators and/or power users. The construction of a vacuum shutoff valve for a high-voltage circuit breaker is known, for example, from DE 10 200 43 336 A1. The vacuum shutoff valve comprises a circular, straight cylindrical housing, the inside of which is evacuated. The housing is made up of two identical halves, for example straight cylindrical, made of ceramic or of ceramic parts, which are connected in the middle of the housing with transition pieces via a metal cylinder or a metal part. The transition pieces are formed as shield electrodes or shields in the housing.

The vacuum shutoff valve has at least one electrical contact for opening and closing, which has one fixed contact and one movable contact. The contacts are configured in a dish-like manner in the vacuum shutoff valve and are vacuum-sealed. The contacts are guided outwardly in the form of a bolt and are each connected to an external electrical connection, for example in the form of a connection terminal of a high-voltage circuit breaker. The movable contact is guided and supported movably in the vacuum shutoff valve in a vacuum-tight manner via a bellows.

When closing, the movable contact moves towards the fixed contact until mechanical and electrical contact between them is established. When breaking, the movable contact is moved away from the fixed contact until electrical contact between the contacts is interrupted and the distance between them is sufficient to avoid electrical flashover at the applied voltage. A large distance between the contacts is necessary at high voltages. The vacuum interruption valve is made long in order to ensure a sufficient distance inside. The straight cylindrical half of the vacuum interruption valve, made of ceramic or ceramic parts, consists of several parts, for example, which are connected to several transitions via several metal parts. These transitions are each made as a shield electrode or shield in the housing. The joining of the ceramic parts of the housing via metal parts, made of, for example, copper and/or steel, is performed, for example, by brazing.

The connection of the contacts of the vacuum interrupter to, in particular, the holders for supporting the contacts, and thus to the drive and/or to the fixed conductive parts of the high-voltage circuit breaker, is effected by clamping connections. These holders are, for example, made of aluminum and/or steel. Aluminum has a low mass, which allows the acceleration of the drive to be transmitted to the moving contact with low energy consumption, and moreover the fixed contacts can be fixed simply and inexpensively in the high-voltage circuit breaker in a lightweight holder. The contacts of the vacuum interrupter are, for example, made of copper for high current carrying capacity. The connection of the contacts to the respective holders is effected by clamping connections, in particular between the aluminum and the copper parts. The interlocking clamping connections involve two electrical contact points, which lead to excessive heating and electrical losses in the circuit breaker. At very high currents, which can reach several thousand amperes, very high electrical losses can occur and high temperatures in the circuit breaker can lead to damage and/or destruction. Clamping connections, which are, for example, crimped by screwing, are detachable and technically complex, which leads to a high failure rate and high costs.

European Patent Application Publication No. EP 0 102 317 A2

The object of the present invention is to provide a high-voltage circuit breaker that solves the above-mentioned problems, and a method for manufacturing the high-voltage circuit breaker, particularly the above-mentioned high-voltage circuit breaker. In particular, the object is to provide a high-voltage circuit breaker in which at least one vacuum shutoff valve is arranged and supported in a mechanically stable manner, has a low failure rate, has small electrical loss in the closed state, and generates little heat, particularly when a large current flows.

This problem is solved by a high-voltage circuit breaker having the features of claim 1 and/or by a method for manufacturing a high-voltage circuit breaker, in particular the aforementioned high-voltage circuit breaker, according to claim 15. Advantageous configurations of the high-voltage circuit breaker according to the invention and/or of the method for manufacturing a high-voltage circuit breaker according to the invention, in particular the aforementioned high-voltage circuit breaker, are set out in the dependent claims. The subject matter of the main claims can be combined with each other and with the features of the dependent claims, and the features of the dependent claims can be combined with each other.

The high-voltage circuit breaker according to the present invention comprises at least one vacuum shutoff valve, which is supported by at least one holder of the high-voltage circuit breaker, and in this case, the vacuum shutoff valve has at least two contacts, which are connected to the at least one holder. At least one contact is connected to the at least one holder via a contact sleeve.

The contact sleeve allows for a mechanically stable and well-conductive connection between the at least one contact and the at least one holder, which connection can be permanent, simple and cost-effectively implemented. The low contact resistance through the interface of the contact sleeve with the at least one contact and the at least one holder results in, in particular, less heating in the contact sleeve and/or the contact, as well as in the holder and their interface, and in particular allows currents in the range of up to several thousand amperes to flow.

These at least two contacts can be connected to at least one holder, in particular one each to one holder, via a contact sleeve in each case. This results in a good conductive connection through the high-voltage circuit breaker, in particular through both contacts and their holders, in the closed state of the high-voltage circuit breaker. This contact sleeve results in high mechanical stability and the above-mentioned good electrical properties, which have the above-mentioned advantages.

The contact sleeve can be formed in such a way that it creates a mechanically stable direct electrical contact between at least one contact and at least one holder. A direct contact results in a particularly high mechanical stability and particularly good electrical properties. In this way, in the closed state of the high-voltage circuit breaker, a good conductive connection is obtained through the high-voltage circuit breaker, in particular through both contacts and their holders, which has the advantages mentioned above.

The contact sleeve can be connected to the at least one holder by a welded connection, in particular an electron beam welded connection. A welded connection, in particular an electron beam welded connection, has a high mechanical stability, can be easily and inexpensively performed, and allows a good electrical flow with low electrical losses and low heat generation through the welded connection, especially at high currents.

The contact sleeve can be applied on at least one contact, in particular by spraying and/or by pressing and/or by sputtering and/or electrochemically. The contact sleeve can be applied in a snap-fit manner. This results in a high mechanical strength of the contact sleeve and the contact with a high electrical conductivity through this connection, i.e. a low contact resistance. This allows a low-cost attachment of the contact sleeve with high strength and good electrical properties, whereby contact sleeves of various shapes can be produced simply and at low cost. A connection of the contact sleeve and the contact without air-like inclusions is also possible, which has the advantages mentioned above. In this case, spraying is particularly cost-effective, pressing allows the production of a large number of shapes, in particular by three-dimensional printing, sputtering results in a contact sleeve with high strength and good electrical properties, electrochemical deposition is very low-cost and results in good electrical properties and high strength of the contact sleeve, and the combination of these methods allows contact sleeves with precisely defined properties to be obtained, as well as specific, desired and/or prescribed properties to be obtained in suitable materials.

The contact sleeve can be shrink fitted onto at least one contact. The contact sleeve can be shrink fitted in a telescopic manner. Shrink fitting is a simple, low-cost and short process, which allows the use of prefabricated contact sleeves made of suitable materials that provide low electrical resistance and particularly high mechanical stability. Telescopic shrink fitting has the advantages already described for telescopic installation.

The contact sleeve can be screwed onto at least one contact. A screw connection can be repeatedly attached and detached and has high mechanical stability. Even with a screw connection, the large contact area provides good electrical conductivity and reduces heat generation at high currents.

The contact sleeve may contain and/or be made of aluminum. Aluminum is cheap, lightweight, has high electrical conductivity, high thermal conductivity and high mechanical strength. The low weight, especially for the moving contacts, allows for fast opening and closing speeds with low energy consumption. The at least one contact may contain and/or be made of copper. Copper has a very high electrical conductivity and therefore generates little heat at high currents. Copper has a high thermal conductivity and is mechanically stable. The at least one holder may contain and/or be made of aluminum, which leads to the advantages mentioned above for the contact sleeve.

The contact sleeve can be a hollow cylinder, in particular a straight cylinder. Cylinders are easy to manufacture, have high stability and, moreover, have a large outer surface area, which serves as a contact area, thereby reducing current losses and heat generation at high currents.

The contact sleeve can be in the form of a hollow frusto-cone, in particular a straight frusto-cone, which provides a larger surface area than a cylindrical contact sleeve and thus provides the advantages mentioned above. In particular, the cylindrical outer shape and the frusto-conical inner shape provide a contact sleeve which has a large contact surface area with the contact and which is easy to manufacture and to connect to the holder, for example by welding.

The contact sleeve is shaped like a pipe and has, in particular, one through opening, which allows it to be mounted on the contacts easily and quickly, has high mechanical stability and, in particular by the shrink fitting method, a large contact area.

The contact sleeve can be in the form of a pipe, which is open on one side and closed or sealed on the other side, the closed side of the pipe being in particular in the form of a flat bottom plate, by means of which the contact sleeve can be attached to the holder, in particular by being welded and/or brazed in an area-wise manner, and has a high mechanical stability and good electrical properties.

The vacuum interrupter valve includes at least one fixed contact and at least one movable contact, the fixed contact being capable of being coupled to a fixed holder, in particular via a contact sleeve, and/or the movable contact being coupled to a movable slide piece of a holder, in particular via a contact sleeve, the movable slide piece being arranged in a fixed holder sleeve of the holder. This allows for a mechanically stable high-voltage circuit breaker with easily movable contacts with low energy consumption when opening and closing, which has good electrical properties, in particular a high electrical conductivity and low resistance through the high-voltage circuit breaker in the closed state.

The high voltage circuit breaker can be configured to switch voltages ranging from a few kilovolts up to 1200 kilovolts. The above-mentioned advantages are particularly advantageous at high currents and/or voltages.

The method for manufacturing a high-voltage circuit breaker, in particular the method for manufacturing a high-voltage circuit breaker as described above, which comprises at least one vacuum shutoff valve supported by at least one holder of the high-voltage circuit breaker, the vacuum shutoff valve having at least two contacts, which are configured to be coupled to at least one holder, includes that the coupling of the at least one contact with the at least one holder is performed in a particularly electrically conductive and mechanically stable manner via a contact sleeve, in particular via a contact sleeve having a welded connection between the contact sleeve and the at least one holder, and/or via a contact sleeve which is coupled to the at least one contact by spraying, pressing, sputtering, electrochemical deposition, screwing and/or shrink fitting onto the at least one contact.

The advantages of the manufacturing method according to claim 15 of the high-voltage circuit breaker, in particular the above-mentioned high-voltage circuit breaker, are similar to the advantages of the high-voltage circuit breaker according to claim 1 and vice versa.

Below, Figures 1 to 10 show schematic diagrams of a high-voltage circuit breaker according to the prior art and an embodiment of the present invention, and will be described in more detail.

1 is a schematic partial cross-sectional side view of a portion of a high-voltage circuit breaker 1 according to the prior art, which includes a vacuum shutoff valve 2, the vacuum shutoff valve 2 being fixed to a holder 3 by a clamp. FIG. 1 is a schematic cross-sectional view of a high-voltage circuit breaker 1 according to the present invention, which is provided with a vacuum shut-off valve 2, which is supported by a holder (5, 6) via its two contacts (3, 4), which are connected to the respective holders (5, 6) via cylindrical contact sleeves 9. FIG. 3 is a schematic cross-sectional view of a portion of the high-voltage circuit breaker 1 of FIG. 2, which comprises a holder 5 for a fixed contact 3, the holder having a fixed holder sleeve 8 which is connected to the fixed contact 3 via a contact sleeve 9. FIG. 3 is a schematic cross-sectional view of a portion of the high-voltage circuit breaker 1 of FIG. 2, which comprises a holder 6 for a movable contact 4, the holder having a movable slide piece 7 which is connected to the movable contact 4 via a contact sleeve 9. FIG. 1 is a schematic cross-sectional view of a high-voltage circuit breaker 1 according to the present invention, which is provided with a vacuum shut-off valve 2, which is supported by a holder (5, 6) via its two contacts (3, 4), which are connected to the respective holders (5, 6) via contact sleeves 9 having an internal frusto-conical shape. FIG. 6 is a schematic cross-sectional view of a portion of the high-voltage circuit breaker 1 of FIG. 5, which comprises a holder 5 for a fixed contact 3, the holder having a fixed holder sleeve 8 which is connected to the fixed contact 3 via a contact sleeve 9. FIG. 5 is a schematic cross-sectional view of a portion of the high-voltage circuit breaker 1, which comprises a holder 6 for a movable contact 4, the holder having a movable slide piece 7 which is connected to the movable contact 4 via a contact sleeve 9. FIG. 1 is a schematic cross-sectional view of a high-voltage circuit breaker 1 according to the present invention, which is provided with a vacuum shut-off valve 2, which is supported by a holder (5, 6) via its two contacts (3, 4), which are connected to the respective holders (5, 6) by screwing via cylindrical contact sleeves 9. FIG. 9 is a schematic cross-sectional view of a portion of the high-voltage circuit breaker 1 of FIG. 8. The high-voltage circuit breaker has a holder 5 for a fixed contact 3, which has a holder sleeve 8 to which the holder is fixed, which is connected to the fixed contact 3 via a contact sleeve 9. FIG. 9 is a schematic cross-sectional view of a portion of the high-voltage circuit breaker 1 of FIG. 8, which has a holder 6 for a movable contact 4, which has a movable slide piece 7 that is connected to the movable contact 4 via a contact sleeve 9.

Figure 1 is a schematic partial cross-sectional side view of a part of a high-voltage circuit breaker 1 according to the prior art. This high-voltage circuit breaker 1 has one vacuum shutoff valve 2, which is fixed to a holder 3 by a clamp. Figure 1 shows one side of the vacuum shutoff valve 2 with a movable contact 4, particularly made of copper, and a holder 6 for this movable contact 4, particularly made of aluminum, for example silver-plated.

The holder 6 is formed in the form of or includes a clamping device, which mechanically fixes the cylindrical end of the contact 4 to the holder 6 by a releasable clamping and allows electrical conduction between the contact 4 and the holder 6. In the unclamped state, the holder is open or has a gap. For clamping, the e.g. cylindrical end of the contact 4 is inserted into the opening of the holder 6. By pressing the holder 6, e.g. by screwing the hole shown circularly in the upper half of FIG. 1, the gap is closed and the contact 4 is mechanically stable and electrically conductively clamped by the releasable clamping device.

Figure 2 shows a schematic cross-section of a high-voltage circuit breaker 1 according to the invention. This high-voltage circuit breaker 1 has a vacuum shut-off valve 2, which is supported by holders 5, 6 via its two contacts 3, 4. The contacts 3, 4 are connected to the respective holders 5, 6, in particular via cylindrical contact sleeves. In Figure 3, the fixed contact 3 of the vacuum shut-off valve 2 is shown enlarged, which is connected to the holder 5 of the fixed contact 3. The holder 5 is, for example, formed as a flange, which is fixed to the housing of the high-voltage circuit breaker 1. For the sake of simplicity, this housing is not shown in these figures.

In FIG. 4, the movable contact 4 of the vacuum interrupter valve 2 is shown enlarged, which is connected to the holder 6 of the movable contact 4. The holder 6 of the movable contact 4 comprises a fixed holder sleeve 8 or a holder flange, which is fixed, for example, to the housing of the high-voltage circuit breaker 1. In the fixed holder sleeve 8, a movable sliding piece 7, for example in the form of a sliding disk and/or a sliding cylinder, is arranged. The movable contact 4 is mechanically rigidly and electrically conductively fixed to the movable sliding piece 7. The movable sliding piece 7 is movably arranged in the fixed holder sleeve 8 and is electrically conductively connected to the fixed holder sleeve 8, for example via a sliding contact.

The contacts 3 and 4 each have one, in particular a hollow cylindrical contact sleeve 9, the cylinder of which is closed on one side by a disk-shaped cylindrical bottom plate. The contact sleeve 9 is, for example, cylindrical on the inside and outside, the inside shape being the same as the outside, only smaller, and the inside shape being the same as the shape of the respective ends of the contacts 3 and 4. On the side of the disk-shaped cylindrical bottom plate of the contact sleeve 9, the holders 5, 6 are fixed to the contact sleeve 9, for example by welding, in particular by electron beam welding.

On the side of the fixed contact 3, the holder 5 is in the form of a sleeve or a hollow cylinder and/or pipe, which in particular has a flange on the side opposite the vacuum shutoff valve 2 and on the inside is formed, for example, a disk with a number of ventilation holes and a cylindrical projection in the middle. The contact sleeve 9 is fixed to the projection of the holder 5, in particular by electron beam welding. The holder 5 and the contact sleeve 9 are, for example, made of the same material, in particular aluminum and/or contain aluminum, in particular an aluminum alloy. The contact sleeve 9 is matingly arranged on the end of the fixed contact 3. This contact sleeve 9 is, for example, shrink-fitted, sprayed, pressed, sputtered and/or electrochemically applied.

A good electrical and thermal contact between the holder 5 and the vacuum cutoff valve 2 is obtained by the contact sleeve 9 fixed on the fixed contact 3, for example by shrink fitting, spraying, pressing, sputtering and/or electrochemical deposition, so as to be mechanically strong and have good electrical and thermal conductivity. The contact sleeve 9 is fixed to the holder 5 of the fixed contact 3, in particular by electron beam welding, so as to be mechanically strong and have good electrical and thermal conductivity. As a result, even if a large current flows, in particular in the range of several amperes to several hundred amperes, there is no significant electrical loss or heat due to heating of the contact part. In particular, if a high temperature or a large amount of heat is generated due to a large contact resistance of the contact part, this may lead to damage or destruction of the high-voltage circuit breaker 1.

On the side of the movable contact 4, as shown in FIG. 4, the holder is in the form of a fixed holder sleeve or a hollow cylinder and/or a pipe, which has, in particular, a flange on the side opposite the vacuum shut-off valve 2. In the fixed holder sleeve 8, a movable sliding piece 7 is arranged as described above and is movably supported. This sliding piece 7 is moved by elements of the drive and/or movement mechanism, in particular when opening and closing the high-voltage circuit breaker 1. This is not shown in the drawings for the sake of simplicity. For example, the sliding piece 7 in the form of a sliding cylinder with a sliding disk and/or inner disk has, in particular, a cylindrical projection in the middle. The contact sleeve 9 is fixed to the projection of the sliding piece 7, in particular by electron beam welding.

The holder sleeve 8 and/or the sliding piece 7 and the contact sleeve 9 are, for example, made of the same material, in particular aluminum, and/or contain aluminum, in particular an aluminum alloy. The contact sleeve 9 is matingly arranged on the end of the movable contact 4. The contact sleeve 9 is, for example, shrink-fitted, sprayed, pressed, sputtered and/or electrochemically deposited.

A good electrical and thermal contact between the holder 6 and the vacuum cutoff valve 2 is obtained by the contact sleeve 9, which is fixed to the movable contact 4 mechanically and with good electrical and thermal conductivity, for example by shrink fitting, spraying, pressing, sputtering, and/or electrochemical deposition. The contact sleeve 9 is fixed to the holder 6 or the slide piece 7 of the movable contact 4 mechanically and with good electrical and thermal conductivity, in particular by electron beam welding. As a result, as described above for the contact portion between the fixed contact 3 and the holder 5, no significant electrical loss or heat is generated by the heating of this contact portion, even when a large current flows, particularly in the range of several amperes to several hundred amperes, which has the advantages described above.

Figures 5 to 7 show another embodiment of a high voltage circuit breaker 1 according to the invention. This high voltage circuit breaker 1 is similar to the high voltage circuit breaker 1 of Figures 2 to 4, but in this case the inner contact sleeve 9 and the ends of the contacts 3 and 4 are frustoconical rather than cylindrical. As a result, the contact area between the contact sleeve 9 and each contact 3, 4 is enlarged compared to the embodiment of Figures 2 to 4. The enlarged contact area reduces the contact resistance and therefore the electrical losses and heat generation, with the advantages mentioned above.

8 to 10 show another embodiment of the high-voltage circuit breaker 1 according to the invention. This high-voltage circuit breaker 1 is similar to the high-voltage circuit breaker 1 of FIGS. 2 to 4 and 5 to 7, but in this case the respective contact sleeve 9 and the end of the respective contact 3, 4 are connected to one another by a screw connection. These contact sleeves 9 are screwed to the respective ends of the contacts 3 and 4. The ends of the contacts 3 and 4 are formed in a threaded form for this purpose, and these contact sleeves 9 have a particularly fitting thread on the inside. In a first step, the contact sleeves 9 can be fixed to the holders 5 and 6 or to the movable slide piece 7, for example by welding, in particular by electron beam welding. In a second step, the contacts 3 and 4 can be screwed to the respective holders 5 and 6 or to the movable slide piece 7, without damaging or destroying the vacuum interruption valve 2, for example by the high temperatures that occur during welding.

The above-mentioned embodiments can be combined with one another and/or with the prior art. For example, the contact sleeve 9 can be threaded and screwed into the contacts 3, 4, respectively. Combinations of shapes and connections are also possible. Instead of a welded connection, for example a brazed connection can be used. One or several vacuum shutoff valves 2 can be used, for example connected in series and/or in parallel.

The vacuum shutoff valve 2 is configured for switching up to 35 kV and/or 145 kV. For the sake of simplicity, the individual elements or parts of the vacuum shutoff valve 2 are not shown in detail in the drawings. The vacuum shutoff valve 2 is, for example, cylindrical and has a number of conductive contacts, in particular one movable contact and one fixed contact, for example made of copper, the ends of which protrude from a ceramic, evacuated hollow insulator. In this case, the movable contact side of the hollow insulator is hermetically sealed by a metal bellows, and the fixed contact side is hermetically sealed by a fixed metal disk or a fixed metal lid. The vacuum shutoff valve includes other elements or parts, such as, for example, a shield electrode, which will not be described in detail below.

The holders 5, 6 and the holder sleeve 8 are, for example, formed as hollow pipes and have fixing flanges at their ends that are guided towards the outside. Alternatively, these holders can be integral parts of the housing of the high-voltage circuit breaker 1. The holder 6 with the spatially fixed holder sleeve 8 and the movable slide piece 7, and the holder 5 are, for example, formed as hollow pipes into which the vacuum shut-off valve 2 is inserted and hermetically sealed, for example by means of a seal.

The high-voltage circuit breaker 1 can have a housing, which is filled with a breaker gas, in particular _SF6 and/or clean air, which is not shown in the drawings for the sake of simplicity. The housing is, for example, in particular a hermetically sealed hollow insulator, which is provided with a number of ribs made of ceramic, silicone and/or composite material on the outer periphery in order to reduce creepage currents. Alternatively, the housing is, for example, a hermetically sealed metal tank, which is electrically earthed. From these holders, connection terminals are guided outwardly from the housing for electrically connecting the high-voltage circuit breaker 1 to the power system, in particular to the generator and/or consumer and/or power cable. The high-voltage circuit breaker 1 furthermore has a support, in particular for arranging it on a foundation. The high-voltage circuit breaker 1 furthermore has a drive, in particular a spring-loaded drive, and elements of a kinematic mechanism for driving the movable contact when opening and closing, for example a gear and at least one drive rod.

The high voltage circuit breaker 1 is made of one moving contact and one fixed contact. Alternatively or additionally, it may comprise further contacts and/or it may comprise at least two moving contacts. The contacts are made of copper. Alternatively or additionally, it may comprise other materials, for example steel and/or aluminium. The contact sleeve is made of aluminium. Alternatively or additionally, it may comprise other materials, for example copper and/or steel. The holder is made of aluminium. Alternatively or additionally, it may comprise other materials, for example steel and/or copper.

A mechanically stable and well-conductive connection between the vacuum shutoff valve 2, in particular with the copper contacts 3, 4, and the holder 5, 6 or the movable slide piece 7 of the holder 6, in particular made of aluminum, is difficult to achieve with typical, in particular snap-on clamp connections. The use of the contact sleeve 9 according to the invention between the contacts 3, 4 and the holder 5, 6, in particular the slide piece 7, allows a transition or contact between the contacts 3, 4 of the vacuum shutoff valve 2 and the holder 5, 6 or the movable slide piece 7 that is mechanically stable, has good electrical conductivity and does not generate significant heat, in particular during fast drive operations. The good thermal conductivity allows in particular a good evacuation of waste heat from the vacuum shutoff valve 2. This reduces and/or eliminates the risk of damage and/or destruction of the vacuum shutoff valve 2.

Reference Signs List 1 High voltage circuit breaker 2 Vacuum shutoff valve 3 Fixed contact 4 Moving contact 5 Fixed contact holder 6 Moving contact holder 7 Moving slide piece 8 Fixed holder sleeve 9 Contact sleeve 10 Welded connection

Claims (13)

A high-voltage circuit breaker (1) comprising at least one vacuum shutoff valve (2), said vacuum shutoff valve (2) being supported by at least one holder (5, 6) of said high-voltage circuit breaker (1), said vacuum shutoff valve (2) having at least two contacts (3, 4) which are coupled to said at least one holder (5, 6),
At least one contact (3, 4) is connected to said at least one holder (5, 6) via a contact sleeve (9),
the contact sleeve (9) is shrink fitted onto the at least one contact (3, 4);
A high voltage circuit breaker (1). The high-voltage circuit breaker (1) according to claim 1, characterized in that the at least two contacts (3, 4) are connected to the at least one holder (5, 6) via one contact sleeve (9). The high-voltage circuit breaker (1) according to claim 1 or 2, characterized in that the contact sleeve (3, 4) is formed to create a mechanically stable direct electrical contact between the at least one contact (3, 4) and the at least one holder (5, 6). A high-voltage circuit breaker (1) according to any one of claims 1 to 3, characterized in that the contact sleeve (9) is connected to the at least one holder (5, 6) by a welded connection (10). A high-voltage circuit breaker (1) according to any one of claims 1 to 4, characterized in that the contact sleeve (9) is mounted on the at least one contact (3, 4). the contact sleeve (9) comprises and/or is made of aluminium,
and/or
said at least one contact (3, 4) comprises and/or is made of copper;
and/or
said at least one holder (5, 6) comprises and/or is made of aluminium,
A high voltage circuit breaker (1) according to any one of the preceding claims. 7. The high voltage circuit breaker (1) according to any one of claims 1 to 6 , characterized in that the contact sleeve (9) is hollow cylindrical. 8. High voltage circuit breaker (1) according to any one of claims 1 to 7 , characterized in that the contact sleeve (9) is hollow frusto-conical. 9. The high voltage circuit breaker (1) according to any one of claims 1 to 8 , characterized in that the contact sleeve (9) is shaped like a pipe. The contact sleeve (9) is formed in the shape of a pipe, one side of which is open and the other side is closed,
The closed side of the pipe is formed in the form of a flat bottom plate.
A high voltage circuit breaker (1) according to any one of the preceding claims. The vacuum shutoff valve (2) includes at least one fixed contact (3) and at least one movable contact (4),
The fixed contact (3) is connected to a fixed holder (5),
and/or
The movable contact (4) is coupled to a movable slide piece (7) of a holder (6), and the movable slide piece (7) is disposed in a fixed holder sleeve (8) of the holder (6).
A high voltage circuit breaker (1) according to any one of the preceding claims. 12. The high voltage circuit breaker (1) according to any one of the preceding claims, characterized in that it is adapted to switch voltages ranging from a few kilovolts up to 1200 kilovolts. A method for manufacturing a high-voltage circuit breaker (1) according to any one of claims 1 to 12 , comprising at least one vacuum shutoff valve (2) supported by at least one holder (5, 6) of the high-voltage circuit breaker (1), the vacuum shutoff valve (2) having at least two contacts (3, 4), the contacts being coupled to the at least one holder (5, 6),
The coupling between at least one contact (3, 4) and said at least one holder (5, 6) comprises:
via the contact sleeve (9),
and/or
via a contact sleeve (9) which is coupled to the at least one contact (3, 4) by spraying, pressing, sputtering, electrochemical deposition, screwing and/or shrink fitting onto the at least one contact (3, 4),
A method comprising:

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