JP7695345B2 - High-voltage circuit breaker using shrink-fit joint 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, which is low in cost, 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 patent claim 1 and/or by a method for producing a high-voltage circuit breaker, in particular the aforementioned high-voltage circuit breaker, according to patent claim 14. Advantageous configurations of the high-voltage circuit breaker according to the invention and/or of the method for producing 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 one another and with the features of the dependent claims, and the features of the dependent claims can be combined with one another.

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 directly connected to the at least one holder by a shrink-fit connection.

The shrink-fit connection allows 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, low heating at the connection surfaces and/or the contact, as well as the holder and their interface, and allows in particular currents in the range of up to several hundred amperes to be passed.

Clamped connections via screwed joints, as is common in the prior art, have two or more joining surfaces with high contact resistance at these surfaces, high power losses and less mechanical stability than connections where one element is shrunk onto the other. The pre-shrink temperature of the heated elements or parts creates a direct, inseparable bond by a diffusion process at and beyond the joining surfaces, with good electrical conductivity and low resistance. The good thermal conductivity of the shrink-fit joint allows good evacuation of excess heat from the vacuum interrupter, especially when opening and closing. This reduces the probability of damage to and destruction of the high-voltage circuit breaker and increases its durability.

These at least two contacts can be connected to at least one holder, in particular each to one holder, via a shrink-fit connection, so that 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. This shrink-fit connection results in high mechanical stability and the above-mentioned good electrical properties, which have the above-mentioned advantages.

This shrink-fit connection can be produced by thermal shrinkage. Thermal shrinkage can be carried out simply and inexpensively by heating and then cooling at least one element or part. In particular, a cold, e.g. room temperature, component can be inserted into an opening of a heated component, and when the heated component cools down, the dimensions of the heated component and thus the opening shrink. In this way, a simple, inexpensive, mechanically strong and electrically conductive connection can be achieved between the cooled component and, in particular, the room temperature component. It is likewise effective to cool one component and then heat the cooled component, e.g. inserted into an opening of the room temperature component, as well as a combination of cooling one component and heating the other. By this definition, the connection thus produced is also described below as a shrink-fit connection.

This shrink-fit connection can be formed in such a way as to create 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 at least one holder can be shrink-fitted onto the at least one contact. This is preferably the case when the contact is at least partially, e.g. at its end, smaller in dimensions, e.g. diameter, than the at least one holder, especially when the opening inside the holder has approximately the same dimensions as that part of the contact.

The at least one holder may have an opening, in particular a cylindrical or frustoconical opening, in the interior, in particular a central opening. The opening of the at least one holder may be a through opening. The at least one contact connected to the at least one holder may at least partially have the shape of the opening. The at least one contact connected to the at least one holder may be arranged through the opening. This can be technically easily implemented and makes it possible to use, in particular, long contacts with large manufacturing tolerances.

Alternatively or additionally, one side of the opening of the at least one holder can be closed. The shape of the at least one contact that can be coupled to the at least one holder can be at least partially the shape of the opening. The at least one contact that can be coupled to the at least one holder can be arranged to protrude into the opening. This allows for a mechanically stable arrangement with an additional contact area for good electrical and/or thermal contact, which is present on the closing side.

The contact can be a movable contact and the holder can be a holder for a movable contact, which includes a fixed holder sleeve and a sliding piece movably supported in the holder sleeve, the sliding piece being shrink-fitted on the movable contact. The mechanically stable connection between the movable contact and the sliding piece allows reliable opening and closing and fast movements without the connection being destroyed, and also allows good electrical and/or thermal conduction, in particular from the contact across the sliding piece and the holder sleeve, in particular by means of, for example, spring contacts and/or electrical sliding contacts, between the sliding piece and the holder sleeve.

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. Aluminum is cheap, lightweight, and has high electrical conductivity, high thermal conductivity and high mechanical strength, which are lower than those of copper. The low weight, especially for holders for moving contacts, allows high opening and closing speeds with low energy consumption, especially for the sliding pieces of the holder.

At least one contact can be coated with silver, in particular electrochemically deposited. At least one holder can be coated with silver, in particular electrochemically deposited. These silver coatings allow good electrical and/or thermal contact and can lead to integration of contact and holder, in particular during heat treatment, when using different materials, in particular when both materials are coated, in particular with silver. This results in a bond with good electrical, thermal and mechanical properties, which has the advantages mentioned above.

The vacuum interrupter valve includes at least one fixed contact and at least one movable contact, the fixed contact being connectable to a fixed holder by shrink fitting and/or the movable contact being connectable to a movable slide piece of a holder by shrink fitting, the movable slide piece being disposed 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, the high-voltage circuit breaker having good electrical properties, in particular 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, and the contacts being configured to be coupled to at least one holder, includes that the coupling between at least one contact and at least one holder is performed directly by shrink fitting, in particular so as to have good electrical conductivity and mechanical stability.

This shrink fitting can in particular be performed by thermal cooling of a heated holder onto the contacts, in particular onto the contacts at room temperature, and/or by thermal cooling of a heated contact onto the holder, in particular onto the holder at room temperature.

The advantages of the high-voltage circuit breaker, and in particular the manufacturing method of the above-mentioned high-voltage circuit breaker according to claim 14, are similar to the advantages of the high-voltage circuit breaker according to claim 1, and vice versa.

Below, Figures 1 to 4 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 interrupter valve 2 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 shutoff valve 2, the vacuum shutoff valve 2 being supported by a holder (5, 6) via its two contacts (3, 4), the contacts (3, 4) being connected to the respective holders (5, 6) by shrink-fit connection. FIG. 3 is a schematic cross-sectional view of a portion of the high-voltage circuit breaker 1 of FIG. 2 having a movable sliding piece 7, the movable sliding piece 7 being connected to a movable contact 4 by a shrink-fit connection, the contact 4 being disposed within an opening of the sliding piece 7 that is closed on one side. FIG. 4 is a schematic cross-sectional view of a portion of a high-voltage circuit breaker 1 similar to that of FIG. 3, and includes a movable contact 4. However, unlike FIG. 3, this movable contact 4 is disposed within an opening that penetrates a movable slide piece 7.

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 6 by a clamp that can be repeatedly attached and detached via a screw 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, plated with silver.

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, as shown in the unhatched upper half of the holder 6 in FIG. 1. To clamp, the e.g. cylindrical end of the contact 4 is inserted into the opening of the holder 6. The gap is closed by pressing the gap of the holder 6, e.g. by screwing the hole shown as a circle in the upper half of FIG. 1, and the contact 4 is clamped by the releasable clamping device in a mechanically stable and conductive manner.

The above-mentioned clamping connections are detachable and technically complex, which therefore leads to a high failure rate and high costs. The mating and/or material bond between the holder 6 and the contact 4 is not formed in an area-like manner in the case of a clamping connection, because surface irregularities and air inclusions prevent an area-like mating connection even with high clamping forces. High clamping forces, especially non-uniformly distributed clamping forces, lead in particular to material fatigue and/or breakage of the holder 6, which reduces the durability and/or reliability of the high-voltage circuit breaker 1.

2 shows a schematic cross-section of a high-voltage circuit breaker 1 according to the invention. The high-voltage circuit breaker 1 has a vacuum interruption valve 2, which is supported by the holders 5, 6 via its two contacts 3, 4. The contacts 3, 4 are directly connected to the respective holders 5, 6 via a shrink-fit connection. The shrink-fit is formed, for example, by shrinking the respective holders 5, 6 onto the respectively assigned contacts 3, 4. The holders 5, 6 are, for example, heated and expanded, and the contacts 3, 4 are inserted, in particular pressed, into the openings of the holders 3, 4. The holders 5, 6 are then cooled, in particular to room temperature, or cooled. On cooling, the holders 5, 6, i.e. the openings of the holders 5, 6, shrink and a connection with the contacts 3, 4 is formed. This connection is formed, in particular by a mating connection and, for example, by a material connection, when, for example, due to the high temperature during the shrinking process, in particular the holder material and/or the contact material diffuses into the corresponding other material. The strong and uniform force acting between the holders 5, 6 and the contacts 3, 4 via the bonding surfaces allows for a mechanically strong, stable, permanent, inseparable, and especially materially bonded bond, which has good electrical properties, i.e., low contact resistance through the bond.

The good electrical properties result in low power losses through the high voltage circuit breaker 1 and low heat generation, especially at high currents in the range of several amperes to several hundred amperes. The low heat generation increases the durability and reliability of the high voltage circuit breaker 1 and reduces the probability of damage or destruction of the high voltage circuit breaker 1 due to high temperatures or high waste heat. The shrink fit bond is mechanically stable, permanent, particularly inseparable, and furthermore materially bonded, which results in high reliability of the high voltage circuit breaker 1.

Figure 3 shows an enlarged view of the movable contact 4 of the vacuum interruption valve 2, which is coupled to the movable sliding piece 7 of its holder. The holder 6 of the movable contact 4, as shown in Figure 2, 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. For the sake of simplicity, the housing is not shown in the drawing. Inside the fixed holder sleeve 8, a sliding piece 7, for example in the form of a sliding disk and/or a sliding cylinder, is arranged. The movable contact 4 is directly fixed to this sliding piece 7 in a mechanically fixed and electrically conductive manner. This movable sliding piece 7 is movably arranged inside the fixed holder sleeve 8 and is conductively coupled to the fixed holder sleeve 8, for example via sliding contacts. The movable contact 4 can be driven, in particular when opening and closing the high-voltage circuit breaker 1, by the movable sliding piece 7, which is movable, for example, via a drive and/or via several elements of a movement mechanism. The elements of the movement mechanism and the drive are not shown in the drawing for the sake of simplicity.

In the embodiment of FIG. 3, one end of the movable contact 4 is formed cylindrically. The movable slide piece 7 is formed in the form of a slide disk and/or a slide cylinder with an internal disk, for example with a cylindrical protrusion, especially in the middle. A recess is formed in this protrusion, the shape of which is especially the cylindrical end of the movable contact 4. The size of this recess is slightly smaller than or almost the same as the size of the movable contact 4. When the slide piece 7 is heated, the slide piece 7 and thus the recess expand, and the end of the movable contact 4 can be inserted into this recess. When the slide piece 7 cools, the recess contracts, and the slide piece 7 is mechanically firmly fixed to the contact 4. Alternatively or additionally, the contact 4 can be cooled and inserted into the recess. When the contact 4 is heated, it expands and a strong mechanical connection with the slide piece 7 is formed. In the following, the above-mentioned alternatives are also called shrink fitting, but only the first one will be described in detail. In this case, all alternatives are included in the combination.

In Figure 3, the recess in the slide piece 7 is shaped like a pot with a bottom. Figure 4 shows an alternative embodiment, which has a pipe-shaped recess open on both sides. In this case, the end of the contact 4 passes through this recess and one end protrudes from this recess on the side opposite the vacuum shutoff valve 2. The shrink fitting method described above is the same as in the example of Figure 3.

As in the example shown in Figures 3 and 4, the ends of the fixed contacts 3 can be coupled to a fixed holder 5. This is not shown in the drawings for the sake of simplicity, since the basic principle is the same as in Figures 3 and 4 and the advantages are as described above. Combinations of more than two holders 5, 6 and/or combinations of more than two movable holders 6, as well as combinations of multiple holders with fixing devices according to the prior art, are also not shown in the drawings for the sake of simplicity.

The contacts 3, 4 are made of a material with good electrical conductivity, for example copper. The holders 5, 6, in particular the movable holder 7, are for example made of aluminium. By shrink fitting, a fixed and good electrical connection is formed between the two different materials. Alternatively, other materials can be used. For example, the contacts 3, 4 and the holders 5, 6, in particular the sliding piece 7, can be of the same material, for example copper or aluminium. These materials can also include and/or be steel or can include, for example, a copper alloy, an aluminium alloy and/or a steel alloy.

The above-mentioned embodiments can be combined with each other and/or with the prior art, i.e. the recesses of the holders 5, 6 and/or the ends of the contacts 3, 4 can be cylindrical, frustoconical and/or rectangular, in particular cubic. Combinations of these shapes are also possible. One or several vacuum shutoff valves 2, for example connected in series and/or in parallel, can be used.

A 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 a moving contact 4 and a fixed contact 3, for example made of copper, the ends of which protrude from a ceramic, evacuated hollow insulator. In this case, the moving 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 comprises 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 on its outer periphery with a number of ribs made of ceramic, silicone and/or composite material for reducing 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 composed of one moving contact and one fixed contact. Alternatively or additionally, it may contain further contacts and/or at least two moving contacts. 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 and holder 6, i.e. the movable slide piece 7, in particular made of aluminum, is difficult to achieve with typical, in particular snap-fit clamp connections. The use of a direct shrink-fit connection 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, i.e. in particular the movable slide piece 7, which is mechanically stable, has good electrical conductivity and does not generate significant heat, in particular during high-speed 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.

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

Claims (15)

A high-voltage circuit breaker (1) having at least one vacuum shutoff valve (2), the at least one vacuum shutoff valve (2) being supported by at least one holder (5, 6) of the high-voltage circuit breaker (1),
The at least one vacuum shutoff valve (2) comprises at least two contacts (3, 4), and at least one of the at least two contacts (3, 4) (hereinafter referred to as "the at least one contact (3, 4)") is directly connected to the at least one holder (5, 6) by shrink-fitting. 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 a shrink-fit connection. A high-voltage circuit breaker (1) according to claim 1 or 2, characterized in that the shrink-fit joint is produced by thermal contraction. A high-voltage circuit breaker (1) according to any one of claims 1 to 3, characterized in that the shrink-fit joint 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 4, characterized in that the at least one holder (5, 6) is shrink-fitted onto the at least one contact (3, 4). A high-voltage circuit breaker (1) according to any one of claims 1 to 5, characterized in that at least one of the holders (5, 6) has an opening therein. the opening of the at least one holder (5, 6) being a through opening,
and/or
said at least one contact (3, 4) coupled to said at least one holder (5, 6) is at least partially shaped like said opening,
and/or
the at least one contact (3, 4) coupled to the at least one holder (5, 6) is disposed through the opening;
High voltage circuit breaker (1) according to claim 6. One side of the opening of the at least one holder (5, 6) is closed,
and/or
the shape of the at least one contact (3, 4) coupled to the at least one holder (5, 6) is at least partially the shape of the opening,
and/or
the at least one contact (3, 4) coupled to the at least one holder (5, 6) is disposed so as to protrude into the opening;
High voltage circuit breaker (1) according to claim 6. One contact (4) is a movable contact, one holder (6) is a holder for the movable contact (4), the holder includes one fixed holder sleeve (8) and further includes one slide piece (7) movably supported within the holder sleeve (8),
9. The high voltage circuit breaker (1) according to claim 1, wherein the movably supported sliding piece (7) is shrink-fitted onto the movable contact (4). said at least one contact (3, 4) containing and/or 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. said at least one contact (3, 4) being coated with silver;
and/or
said at least one holder (5, 6) being coated with silver;
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) by shrink fitting,
and/or
The movable contact (4) is connected to a movable slide piece (7) of a holder (6) by shrink fitting, 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. A high-voltage circuit breaker (1) according to any one of claims 1 to 12, characterized in that the high-voltage circuit breaker (1) is configured to switch voltages in the range of several kilovolts to 1200 kilovolts. A method for manufacturing a high-voltage circuit breaker (1) according to any one of claims 1 to 13, wherein the at least one vacuum shutoff valve (2) is supported by the at least one holder (5, 6) of the high-voltage circuit breaker (1),
13. The method of claim 12, wherein the at least one vacuum shutoff valve (2) comprises at least two contacts (3, 4), and the connection of at least one of the at least two contacts (3, 4) with the at least one holder (5, 6) is made directly by shrink fitting. The shrink fitting is
by thermal cooling of the heated holders (5, 6) onto the contacts (3, 4),
and/or
by thermal cooling of the heated contacts (3, 4) onto the holders (5, 6),
15. The method of claim 14.

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