ARRANGEMENT AND METHOD FOR DAMPING CONTACT BLOCKING IN HIGH-VOLTAGE POWER SWITCHES

Description

[0001] The invention relates to an arrangement and a method for damping contact bounce in high-voltage circuit breakers, comprising a vacuum switching tube and a holder for the vacuum switching tube, wherein the vacuum switching tube comprises a housing, at least one movable contact piece and at least one fixed contact piece.

[0002] Vacuum interrupters for high-voltage circuit breakers are known, for example, from EP 0 102 317 A2. The vacuum interrupter comprises a housing in the form of a circular, straight cylinder, which is evacuated internally. The housing is constructed from two identical, straight cylindrical halves made of ceramic or ceramic parts, which are joined in the middle of the housing by a metal cylinder or metal part with transition pieces. The transition pieces are designed as shielding electrodes or shielding within the housing. An electrical contact is arranged inside the housing, comprising two contact pieces. One contact piece is fixed to the housing, the second contact piece is movably guided through the housing by a bellows. At their ends, the two contact pieces inside the housing are designed as discs or circular cylinders, respectively, with a base or...The cylinder covers are in contact with each other and pressed together to ensure good electrical and / or mechanical contact. Vacuum switching tubes are also known from GB 1 157 015 A, JP 2011 076758 A and JP 2010 272445 A.

[0003] To form a high-voltage circuit breaker, particularly an outdoor high-voltage circuit breaker, the vacuum interrupter tube is arranged in an insulator, which mechanically supports the vacuum interrupter tube and protects it from external weather conditions. Insulators are made, for example, of ceramics, silicone, and / or composite materials and have a ribbed outer surface, particularly with ribs arranged in a ring around the circumference of a cylinder. The ribs improve the electrical insulation along the longitudinal axis on the outer surface of the insulator. At the top of the insulator is an electrical connection for a power line, e.g., from a power grid, an electrical load, and / or a generator. At the bottom of the insulator is a second electrical connection for a power line, e.g., from a power grid, an electrical load, and / or a generator.The vacuum switching tube switches the current path between the two terminals, i.e., connects and / or disconnects it.

[0004] The insulator is, for example, mounted on a support which is arranged on the foundation of a high-voltage circuit breaker. Three insulators, each with one or more vacuum interrupters, can be arranged side by side to switch multiple poles of a high-voltage circuit breaker. A drive, in particular a spring-loaded drive, and / or one drive per pole, is provided to actuate the movable contact of a vacuum interrupter during switching via elements of a kinematic chain. The drive is, for example, located on the support outside the insulator. The kinetic energy for switching is transmitted from the drive, for example, via gear elements and / or a switching rod, to the movable contact of the vacuum interrupter inside the insulator. High forces must be applied, particularly to overcome frictional forces, to move the elements of the kinematic chain.to accelerate within milliseconds, and to accelerate the moving contact piece.

[0005] For switching high voltages, especially voltages up to 1200 kV and / or currents in the range of several hundred amperes, vacuum interrupters with large dimensions, both spatially and in terms of mass, are used. The contacts can have a mass in the range of several kilograms, which, in the case of the moving contact, must be accelerated, particularly within milliseconds. The vacuum interrupter is arranged in the insulator, e.g., a hollow-tube insulator filled with insulating gas, especially SF6, and is spatially fixed or attached, e.g., by a suspension or bracket at the upper end of the insulator. The fixed contact of the vacuum interrupter is arranged towards the upper side of the insulator, and the moving contact is arranged towards the lower side of the insulator. The moving contact is driven, e.g., by a switching rod.mounted via sealing elements of the insulator and / or a bellows of the vacuum switching tube.

[0006] During the switching process of the vacuum interrupter, the movable contact strikes or collides with the fixed contact. This transfers kinetic energy, or momentum, from the movable to the fixed contact. With a high mass of the movable contact, particularly in the kilogram range, and high speeds, especially when switching across large contact gaps in the off state, and particularly with high switching voltages and switching times in the millisecond range, large momentum pulses are transmitted. The fixed contact is held in place on the vacuum interrupter housing, for example, by a metal plate or is otherwise rigidly fixed. This plate is pushed outwards by a large momentum pulse and rebounds. This causes the fixed contact to begin a pendulum-like motion, resulting in contact bounce. The movable contact bounces against the fixed contact and transmits a portion of its momentum.The fixed contact piece oscillates along the longitudinal axis of the vacuum switching tube and rebounds onto the movable contact piece, which is pressed back towards the fixed contact piece, e.g. by a spring.

[0007] A movement of the contact pieces occurs, with each contact piece colliding with the other and a transfer of momentum. The second contact piece is accelerated away from the first, creating a gap between them. Then, the second contact piece is decelerated by a restoring force, for example, a spring in the case of a movable contact piece, or by the metal plate to which it is attached in the case of a fixed contact piece. It is then accelerated in the opposite direction towards the opposing contact piece. The contact pieces collide, and the movement is repeated, but in the opposite direction. This contact bouncing, in which the contact pieces periodically come into mechanical contact and a gap subsequently forms again, is called contact rebound until the kinetic energy is dissipated during the damped movement.The fact that the energy is completely converted into heat means that an arc burns between the contact pieces in the gap with the high voltage applied.

[0008] The longer the contact bounce lasts, the greater the arc duration and the associated wear on the contacts, as well as the heating of the contacts by the arc. At high contact temperatures, the contacts can stick or weld together, which can lead to failure of the vacuum interrupter tube. Optimizing the kinematic chain, e.g., via gear elements and / or adjusting the mass of the kinematic chain elements, can reduce contact bounce. Such optimization is complex, costly, and can lead to changes or deterioration of switching characteristics, e.g., longer switching times and / or an increase in the kinetic energy required for switching of the high-voltage circuit breaker. This may necessitate a larger drive unit, which entails additional costs and effort.

[0009] The object of the present invention is to provide an arrangement for a high-voltage circuit breaker and a method for damping contact bounce in high-voltage circuit breakers, which solve the problems described above. In particular, it is an object to reduce or suppress contact bounce of the contacts of the vacuum interrupter in a simple and cost-effective manner and / or to increase the service life or reliability of a high-voltage circuit breaker with a vacuum interrupter.

[0010] The stated problem is solved according to the invention by an arrangement for a high-voltage circuit breaker with the features of claim 1 and / or by a method for dampening contact bounce in high-voltage circuit breakers in the arrangement described above according to claim 9. Advantageous embodiments of the arrangement according to the invention for a high-voltage circuit breaker and / or of the method for dampening contact bounce in high-voltage circuit breakers, particularly in the arrangement described above, are specified in the dependent claims. The subject matter of the main claims can be combined with each other and with features of the dependent claims, as well as with features of the dependent claims themselves.

[0011] An arrangement according to the invention for a high-voltage circuit breaker comprises a vacuum interrupter tube and a holder for the vacuum interrupter tube. The vacuum interrupter tube comprises a housing, a movable contact piece, and a fixed contact piece. A mass is mechanically connected to the fixed contact piece in order to dampen the contact bounce between the fixed and movable contact pieces during the switching operation of the high-voltage circuit breaker.

[0012] The mass element reduces or completely prevents contact bounce. The momentum transferred from the moving contact to the fixed contact can be absorbed by the mass element, thus diverting kinetic energy from the fixed contact. As a result, the fixed contact rebounds with minimal kinetic energy and does not rebound against the moving contact. Instead, it can approach the moving contact with minimal kinetic energy until a mechanical and electrical, and especially gentle, contact is established. The moving contact essentially receives no momentum transfer and is not moved away from the fixed contact. Contact bounce is thus prevented.

[0013] Optimization of the contact element movements to dampen contact bounce is achieved via the mass element, thus eliminating the need for complex and costly optimization of the movement via elements of the kinematic chain. This saves costs and effort, resulting in a simple and cost-effective design of the arrangement according to the invention. By reducing or even completely suppressing contact bounce, the arc duration and thus the wear on the contact elements are reduced, and the service life of the vacuum interrupter or the arrangement is increased.

[0014] The mass body is mechanically connected to the holder, specifically positioned within the holder. This results in a simple design with a stable, durable mounting of the mass body, particularly space-saving within the vacuum switching tube holder.

[0015] The vacuum switching tube can be suspended from the holder. This allows the vacuum switching tube to be fixed in a spatially stable manner, for example, within an insulator, in a simple, cost-effective, and long-term stable way. Impulses, which are transmitted to the vacuum switching tube by the movement of the movable contact piece (generated by a drive and transmitted via elements of a kinematic chain), can be compensated or absorbed via the holder and, for example, via an external, particularly solid, insulator.

[0016] The mounting can be tubular, with an intermediate section through which the fixed contact piece is guided via a connecting element, and / or on which a mass is mounted. This results in a simple, cost-effective design, while ensuring long-term stability of the mass.

[0017] The fixed contact piece has the same mass as the moving contact piece. "Same mass" here means essentially the same mass; minor deviations within tolerances, such as manufacturing tolerances, are permissible. This allows the momentum of the fixed contact piece after impact with the moving contact piece to be completely absorbed by the moving contact piece, without any rebound from the fixed contact piece to the moving contact piece. This makes it simple and cost-effective to optimize the rebound behavior of the contact pieces, independent of the kinematic chain and the drive system.

[0018] At least one damping element can be included, particularly between the mounting and the mass, especially in the form of a spring and / or a hydraulic damper. The momentum of the movement of the fixed contact piece, transmitted to the mass, can be completely absorbed by the damping element and, for example, converted into heat. This prevents the momentum of the mass from being transmitted back to the fixed contact piece, and contact bounce, especially rebound of the fixed contact piece onto the movable contact piece, can be completely and easily prevented.

[0019] At least one guide can be included for guiding the movement of one mass body and / or for spatially fixing one mass body along a longitudinal axis, in particular at least one guide which is attached to the holder. This allows an impulse from the fixed contact piece to be effectively absorbed by the mass body, particularly through guided movement of the mass body, and transferred, for example, to a damping element, whereby the mass body returns to its initial position via the guide. Damage, in particular to the holder, or irreversible changes in the position of the mass body are prevented, and the arrangement according to the invention is designed with a simple and cost-effective structure and is stable over the long term.

[0020] The mass element can be solid and / or formed from a single piece, particularly in a substantially cylindrical shape. This allows for a form-fitting, space-saving arrangement of the mass element, especially with cylindrical vacuum switching tubes and / or cylindrical contact pieces and / or cylindrical mounting brackets and / or, in particular, cylindrical outer insulators. A solid, single-piece mass element results in a compact, long-term stable mass element that is well-suited to absorbing large impulses.

[0021] The mass can weigh several kilograms. This allows it to absorb large impulses. With a solid contact piece of several kilograms, the rebound behavior can be optimized, resulting in good damping and / or suppression of contact rebound.

[0022] The mass element can be made of a metal, in particular steel, lead, or copper. The mass element can comprise a metal, in particular steel, copper, lead, and / or alloys of these or other materials. This allows for a large mass to be achieved in a compact form, with high long-term mechanical stability.

[0023] A method according to the invention for damping contact bounce in high-voltage circuit breakers, particularly in a previously described arrangement, comprises the movement of at least one movable contact element when a vacuum interrupter is switched on, which strikes against at least one fixed contact element with a pulse, the pulse being transferred to one of the mass elements. This partially or completely dampens contact bounce, particularly with damping according to the aperiodic limiting case.

[0024] A movement of one mass body in the direction of the fixed contact piece can be damped by a damping element, in particular by a damping element attached to a holder of the vacuum switching tube.

[0025] A movement of one mass body with a mass of the fixed contact piece can cause a complete absorption of the momentum which is transferred when the movable contact piece strikes the fixed contact piece when the vacuum switching tube is switched on.

[0026] The advantages of the inventive method for damping contact bounce in high-voltage circuit breakers in the previously described arrangement according to claim 9 are analogous to the previously described advantages of the inventive arrangement for a high-voltage circuit breaker according to claim 1 and vice versa.

[0027] An embodiment of the invention is shown schematically in the single figure below and described in more detail below.

[0028] This shows A schematic cross-sectional view of an arrangement 1 according to the invention for a high-voltage power switch, comprising a vacuum switching tube 18 and a mass body 12, which, during a switching-on process, dampens the contact bounce between a fixed contact piece 4 and a movable contact piece 3 of the vacuum switching tube 18.

[0029] In Figure 1Figure 1 schematically illustrates a sectional view of an arrangement 1 according to the invention for a high-voltage circuit breaker. The arrangement 1 according to the invention comprises a vacuum interrupter 18, a holder 10 for the vacuum interrupter 18, and a mass 12. The vacuum interrupter 18 has a housing 2, at least one movable contact 3, and at least one fixed contact 4. On the side of the fixed contact 4, the vacuum interrupter 18 is attached to the holder 10, in particular suspended downwards from the holder 10. The mass 12 is arranged in the holder 10 and is in mechanical contact, in particular in direct mechanical contact, with the fixed contact 4.

[0030] The housing 2 of the vacuum switching tube 18 comprises two hollow cylindrical, i.e., tubular, ceramic parts 8, which are connected to each other via a hollow cylindrical, i.e., tubular, metal part 9. The housing parts can be connected, for example, by soldering, welding, and / or gluing. The ceramic parts 8 and the metal part 9 have essentially the same diameter, with the metal part 9 extending at its ends into the inner diameter of the ceramic parts 8 and comprising curved, annular shields 7. At the upper and lower ends of the vacuum switching tube 18, the ceramic parts 8 are each vacuum-tightly sealed by end caps 15, e.g., made of circular or hat-shaped sheet metal. The end caps 15 each have curved, annular shields 7 on their outer circumference, which project into the inner diameter of the ceramic parts 8 and are arranged opposite the shields 7 of the metal part 9.The shields 7 and the metal part 9 shield electromagnetic fields of the contact pieces 3, 4 to the outside and protect the ceramic parts 8 from particles which are caused, for example, by arcs between the contact pieces 3, 4 during switching or by burning off the contact pieces 3, 4.

[0031] The movable contact piece 4 is guided vacuum-tight through the lower end cap 15 of the housing 2 of the vacuum switching tube 18 via a bellows 5. In particular, the movable contact piece 3 can be moved during switching via a switching rod 6 and other elements of the kinematic chain, which are not shown in the figure for the sake of simplicity. This movement is accelerated towards the fixed contact piece 3 when switching on and accelerated away from the fixed contact piece 3 when switching off. The kinetic energy for this movement is provided, for example, by a drive, in particular a spring-loaded drive. Movements with large forces, large accelerations, and large momentum for switching times in the millisecond range can thus be generated and transferred to the movable contact piece 3.

[0032] In the upper region of the vacuum switching tube 18, the fixed contact piece 4 is guided through the upper end cap 15 of the housing 2 of the vacuum switching tube 18 by a connecting element 11, forming a vacuum-tight, mechanically stable connection to the upper end cap 15. The end caps 15 are made, for example, of a sheet metal, in particular a steel sheet, which has a thickness of a few millimeters or less. When the fixed contact piece 4 moves, where "fixed" is used hereafter in the sense of being mechanically stable and fixed or attached to the end cap 15, the sheet metal of the end cap 15 can be bent, causing the fixed contact piece 4 to move slightly. Similar to a spring, a restoring force acts such that the sheet metal deforms back into its original shape, causing the fixed contact piece 4 to move back. Movements of the contact pieces 3 and 4 occur essentially along a central axis 16 of the arrangement 1 and 4, respectively.of the vacuum switching tube 18. Alternatively, the sheet metal of the end cap 15 can be mechanically stable and rigid, wherein the fixed contact piece 4 is immovably connected to the end cap 15, in particular via the connecting element 11. A pulse transmission from the fixed contact piece 4 to the mass body 12 then takes place without movement of the fixed contact piece 4, in particular via the connecting element 11 to the movably mounted mass body 12, and in particular without spring action of the end cap 15 or without bending of the end cap 15.

[0033] The holder 10, on which the vacuum switching tube 18 is arranged and / or attached, i.e., suspended as in the embodiment shown in the figure, is cylindrical, in particular hollow-tube, with an intermediate base 17 inside the holder 10. The holder 10 can be designed, for example, analogous to a hat with a brim, wherein the vacuum switching tube 18 is mechanically and stably attached, in particular, to the brim. The fixed contact piece 4 comprises a connecting element 11, which is, for example, cylindrical or bolt-shaped. The connecting element 11 is mechanically and stably attached to the upper end cap 15 of the vacuum switching tube 18 in a vacuum-tight manner, e.g., welded or soldered in place, and extends through the upper end cap 15, which is in particular sheet-metal-like. Inside the vacuum switching tube 18, a disc-shaped electrical contact piece 4 or an electrode is formed at one end of the connecting element 11.Parallel to the vacuum switching tube 18, a plate-shaped electrical contact piece 3 or a second electrode is formed at one end of, for example, an electrically conductive switching rod 6, which is encompassed by the movable contact piece 3.

[0034] Outside the vacuum switching tube 18, the mass 12 is arranged at the other end of the connecting element 11, in particular in direct mechanical contact with the connecting element 11. The connecting element 11 is movably guided by an opening in the intermediate floor 17, in particular a circular opening, and can be held, for example, by lateral clamps above the opening. The mass 12 is arranged above the connecting element 11, at its end on the intermediate floor 17 of the holder 10, inside the holder 10, which is in particular tubular. The mass 12 is, for example, positively locked to the inner diameter of the holder 10, in particular cylindrical or cap-shaped, and rests mechanically stable, in particular by its weight, on the end of the connecting element 11 and the intermediate floor 17.

[0035] In particular, at least one guide 14 is arranged laterally on the mass body 12, e.g., in the form of a bolt which is anchored in the intermediate floor 17, in particular screwed or welded in place, and which is guided through a bore through the mass body 12. For example, several, in particular three, guides 14 can be arranged at regular intervals from one another in the region of the outer circumference of the mass body 12 to prevent jamming during movement of the mass body 12. In particular, at least one damping element is arranged laterally on the mass body 12, e.g., in the form of a hydraulic damper which is anchored in the intermediate floor 17, in particular screwed or welded in place, and which acts from below, in particular, on a flange of the mass body 12 and / or is mechanically connected to the mass body 12, e.g., screwed or welded in place.In the area of ​​the outer circumference of the mass body 12, several, in particular three, dampers 13 are arranged at regular intervals from one another, in particular offset from the guides 14, in order to enable uniform damping of the movement of the mass body 12 in the direction of the intermediate floor 17.

[0036] When the high-voltage circuit breaker, i.e., the vacuum interrupter 18, is switched on, the movable contact 3 is moved towards the fixed contact 4 until the gap between the two contacts 3 and 4 is closed, and the movable contact 3 is in mechanical and electrical contact with the fixed contact 4. The movement of the movable contact 3 along the central axis 16 is accelerated, particularly at the beginning, and occurs at high speeds to enable switching in the millisecond range. Upon switching on, the movable contact 3 impacts the fixed contact 4 at high speed, transmitting a large impulse to the fixed contact 4. This causes the fixed contact 4, which is rigidly attached to the upper end cap 15 of the vacuum interrupter 18, to move.The movement occurs along the central axis 16 away from the moving contact piece 3, causing the sheet metal of the upper end cap 15 to bulge outwards. The impulse of the fixed contact piece 4 is transferred to the mass body 12, i.e., the mass body 12 is moved along the central axis 16 with the fixed contact piece 4 away from the moving contact piece 3. The guide 14 secures the movement of the mass body 12 along the central axis 16.

[0037] A restoring force exerted by the upper end cap 15, acting analogously to a leaf spring, causes the fixed contact piece 4 to move back towards the movable contact piece 3. Alternatively or additionally, the weight of the mass 12 can cause the fixed contact piece 4 to move back towards the movable contact piece 3. The momentum from the movable contact piece 3, transferred to the fixed contact piece 4 and then to the mass 12, is absorbed by the mass 12, and the return movement of the mass 12 and the fixed contact piece 4 towards the movable contact piece 3 is dampened by the damping element(s) 13. The movement of the fixed contact piece 4 compared to the initial movement of the movable contact piece 3 is small or occurs over a small distance, e.g., in the range of millimeters, until the fixed contact piece 4 is in mechanical and electrical contact with the movable contact piece 3.Due to the short distance, the slow, decelerated movement of the fixed contact 4 towards the movable contact 3 does not result in a significant switching delay or prolonged arcing. The movement is brief and occurs only over this short distance. A large impulse transfer and movement of the movable contact 3 by the returning fixed contact 4 are essentially prevented by impulse absorption by the mass 12 and, in particular, by the decelerated return movement of the fixed contact 4 by the damping elements 13.

[0038] The movable contact piece 3 is held in its contact position with the fixed contact piece 4, for example, by a spring (not shown in the figure for simplicity), and pressed against the fixed contact piece 4. The fixed contact piece 4 is held in its contact position with the movable contact piece 3 and pressed against it by the restoring force of the upper end cap 15 and / or the weight of the mass 12. This ensures good mechanical and electrical contact between the movable and fixed contact pieces 3, 4 when the high-voltage circuit breaker, i.e., the vacuum interrupter 18, is switched on.A contact bounce with multiple, reciprocal collisions of the contact pieces 3, 4 and momentum transfers to each other does not occur, since after the first collision and momentum transfer of the movable contact piece 3 to the rebounding fixed contact piece 4, the momentum of the movement is absorbed by the mass body 12 and in particular transferred to the damping elements 13.

[0039] This prevents a prolonged arc duration between contacts 3 and 4 during switch-on, resulting in minimal erosion of contacts 3 and 4, thus reducing wear and preventing welding of contacts 3 and 4. The service life of contacts 3 and 4, and consequently of the high-voltage circuit breaker (i.e., the vacuum interrupter tube 18), is increased, ensuring long-term stable operation. Complex and costly optimization of the drive and / or kinematic chain to prevent or minimize contact bounce is unnecessary, as the mass element 12 enables simple and cost-effective optimization. A mass element 12 with the same mass as the fixed contact 4 can provide optimal absorption of the switching impulse, resulting in minimal contact bounce and / or minimal arc duration.

[0040] The embodiments described above can be combined with one another and / or with the prior art. For example, springs can be used instead of hydraulic damping elements 13, which, for example, exert a contact pressure of the fixed contact piece 3, 4 on the movable contact piece 3, 4 when switched on. The mass body 12, elements of the holder 10 and / or shields 7 and / or the metal part 9, as well as the bellows 5, the end caps 15, the connecting element 11, the switching rod 6 and the movable and / or fixed contact piece 3, 4, can, for example, be made of steel and / or copper. The opposing surfaces of the contact pieces 3, 4, i.e., the contact surfaces, can be coated to prevent erosion and / or be slotted to selectively push an electric arc outwards and extinguish it using electric fields.The fixed contact piece 4 can be movably mounted in the upper end cap 15 via a bellows, whereby a restoring force in the direction of the movable contact piece 3 is not generated by a spring action of the end cap 15, but e.g. by the weight of the mass body 12 and / or e.g. springs as damping elements 13. Reference symbol list

[0041] 1. Arrangement with vacuum switching tube 2. Housing 3. Movable contact piece 4. Fixed contact piece 5. Bellows 6. Switching rod 7. Shielding 8. Ceramic part 9. Metal part 10. Mounting bracket 11. Connecting element, in particular bolt 12. Grounding element 13. Damping element 14. Guide 15. End cap 16. Central shaft 17. Intermediate base 18. Vacuum switching tube

Claims

1. Assembly (1) for a high-voltage circuit breaker, having a vacuum interrupter (18) and a holder (10) for the vacuum interrupter (18), wherein the vacuum interrupter (18) comprises a housing (2), a movable contact piece (3) and a fixed contact piece (4), and a mass body (12) is mechanically connected to the fixed contact piece (4) in order to effect damping of contact bounce between the fixed contact piece (4) and the movable contact piece (3) during a switch-on operation of the high-voltage circuit breaker, wherein the one mass body (12) is mechanically connected to the holder (10), characterized in that the fixed contact piece (4) has the same mass as the one mass body (12).

2. Assembly (1) according to Claim 1, characterized in that the one mass body (12) is arranged in the holder (10).

3. Assembly (1) according to either of the preceding claims, characterized in that the vacuum interrupter (18) is suspended from the holder (10).

4. Assembly (1) according to one of the preceding claims, characterized in that the holder (10) is of tubular design, with an intermediate floor (17) through which the fixed contact piece (4) is guided by means of a connecting element (11) comprised by the fixed contact piece (4) and / or on which the one mass body (12) is mounted.

5. Assembly (1) according to one of the preceding claims, characterized in that at least one damping element (13) is comprised, between the holder (10) and the one mass body (12), in particular in the form of a spring and / or a hydraulic damper.

6. Assembly (1) according to one of the preceding claims, characterized in that at least one guide (14) is comprised, for the purpose of guiding a movement of the one mass body (12) and / or for spatially fixing the one mass body (12) along a longitudinal axis (16), in particular at least one guide (14) which is fastened to the holder (10).

7. Assembly (1) according to one of the preceding claims, characterized in that the one mass body (12) is of solid design and / or is formed from one piece, in particular is of substantially cylindrical design.

8. Assembly (1) according to one of the preceding claims, characterized in that the one mass body (12) is composed of a metal, in particular steel, lead or copper, or in that the one mass body (12) comprises a metal, in particular steel, copper, lead and / or alloys.

9. Method for damping contact bounce in high-voltage circuit breakers, in an assembly (1) according to one of the preceding claims, comprising a movement of the movable contact piece (3) when the vacuum interrupter (18) is switched on, which movable contact piece strikes the fixed contact piece (4) with a pulse, wherein the pulse is transmitted to the one mass body (12), as a result of which contact bounce is damped.

10. Method according to Claim 9, characterized in that a movement of the one mass body (12) is damped in the direction of the fixed contact piece (4) by a damping element (13), in particular by a damping element (13) fastened to a holder (10) of the vacuum interrupter (18).

11. Method according to either of Claims 9 and 10, characterized in that a movement of the one mass body (12), with a mass of the one mass body (12) in the region of the mass of the fixed contact piece (4), effects absorption of the pulse which, when the movable contact piece (3) strikes the fixed contact piece (4), is transmitted when the vacuum interrupter (18) is switched on.