Bypass switch with two-part closing plunger

Abstract

The invention relates to a switch (1) for bypassing a submodule of a current converter, wherein the switch (1) has a first contact element (5) and a second contact element (7) which lies opposite the first contact element (5) along a contacting direction (9) and is spaced apart from the first contact element (5), wherein the two contact elements (5, 7) are immovable relative to one another, and wherein a closing plunger (27) is provided, which, in a separated position (3), is held in a channel (11) in the first contact element (5) and, in a contact position (97), protrudes from the first contact element (5) into the second contact element (7) and electrically conductively interconnects the two contact elements (5, 7), wherein a detonative propellant charge (37) is provided in order to move the closing plunger (27) out of the separated position (3) and into the contact position (97). In order to allow the switch (1) to be closed quickly and safely, the closing plunger (27) is composed of a sabot (31) and an electrically conductive connecting element (33), wherein, at least in the separated position (3), the sabot (31) faces the detonative propellant charge (37) and the connecting element (33) faces the second contact element (7).

Description

[0001] 2024 PF00756

[0002] 1

[0003] Description

[0004] Bypass switch with two-part closing piston

[0005] The invention relates to a switch for bridging a submodule of a power converter, wherein the switch has a first contact element and a second contact element opposite the first contact element along a contacting direction and spaced apart from the first contact element, wherein the two contact elements are immovable relative to each other, and wherein a closing piston is provided which is held in a disconnected position in a channel in the first contact element and projects from the first contact element into the second contact element in a contact position and electrically connects both contact elements to each other, wherein a detonative drive charge is provided to move the closing piston from the disconnected position into the contact position.

[0006] Power converters can be used to convert direct current (DC) to alternating current (AC) and vice versa. They are essential components for high-voltage direct current (HVDC) transmission systems. Power converters typically consist of multiple modules, called submodules, several of which are connected in series. If a submodule fails, it can be bypassed using bypass switches. To prevent damage to the power converter system, the bypassing of the submodule must be performed quickly enough.

[0007] Switches for bypassing submodules, so-called bypass switches, are known. These serve to quickly disconnect submodules in power converters, especially in the event of a fault. Triggering the switch causes a closing piston to move from the disconnect position to the contact position. In the contact position, the closing piston connects the first submodule to the second submodule.

[0008] 2

[0009] The second contact element is arranged such that the two contact elements are electrically connected to each other by the contacting piston. During the movement of the closing piston from the open position to the closed position, an arc typically forms between the second contact element and the approaching closing piston, which is electrically connected to the first contact element. This generates strong forces acting on the closing piston, particularly Lorentz forces. These forces can cause the closing piston to deflect perpendicular to the direction of contact during its movement. This deflection can slow down the closing piston or cause it to become jammed in the switch. Both of these effects result in a longer duration of the arc, meaning the arc is not without external effects.

[0010] The object of the invention is to provide a switch for bridging a sub-module of a power converter, by which the sub-module can be bypassed quickly and safely.

[0011] This problem is solved by a switch having the features of independent claim 1. In addition, the problem is solved by a submodule with at least one such switch and by a power converter with at least one submodule equipped with at least one switch according to the invention.

[0012] According to the invention, the closing piston is composed of a propellant mirror and an electrically conductive connecting element, wherein, at least in the separation position, the propellant mirror faces the detonative propellant charge and the connecting element faces the second contact element.

[0013] The two-part design of the locking piston has several advantages. Firstly, the two parts of the locking piston, namely the drive mirror and the 2024 PF00756

[0014] 3

[0015] The connecting elements must be movable relative to each other. This allows the closing piston to move through the channel without jamming, even under lateral forces. Furthermore, the two-part design offers the possibility of selecting the materials for the drive mirror and connecting element according to the specific requirements.

[0016] The motive mirror can also be referred to as the drive element. The motive mirror can be subjected to the pressure generated by the detonation of the detonative propellant charge, thereby moving the closing piston in the contact direction towards the second contact element. The motive mirror itself does not need to be electrically conductive, as the electrical connection between the two contact elements can be established by the connecting element. A further advantage of the invention lies in the use of a detonative propellant charge. Compared to the commonly used deflagrative propellant charge, a detonative propellant charge has the advantage of a stronger acceleration of the closing piston. Thus, switching times of less than 100 ps can be achieved.

[0017] In contrast, with lagrative propellant charges, switching times can only be achieved that are in the range of 750 ps.

[0018] The closing piston typically has an elongated shape, with one longitudinal axis of the closing piston running coaxially to a longitudinal axis of the channel that accommodates the closing piston. Both longitudinal axes run parallel to the contact direction.

[0019] The solution according to the invention can be further improved by various embodiments, each advantageous in itself and arbitrarily combinable with one another. These embodiments and their associated advantages are discussed below.

[0020] To obtain a compact closing piston whose two parts are nevertheless movable relative to each other, it is advantageous if the drive mirror and the connecting element are movable. 2024 PF00756

[0021] 4

[0022] are connected to each other. In particular, the driving mirror and the connecting element can be mechanically decoupled.

[0023] Preferably, the driving mirror and the connecting element are articulated together, particularly preferably by a ball joint connection.

[0024] In particular, the driving mirror and the connecting element itself can form a ball joint. One of the two parts can have a concave recess and the other part a convex bulge complementary to the concave recess. The convex bulge is preferably arranged within the concave recess.

[0025] For example, the connecting element can have a concave recess and the driving mirror the complementary convex bulge.

[0026] Igniting the propellant charge produces combustion gases. If these combustion gases enter the arc, they can be blown out of the switch. To prevent this, the closing piston can be provided with at least one elastically deformable sealing element that rotates along one of the piston's circumferences. This elastically deformable sealing element can, in particular, be an O-ring.

[0027] To ensure a secure hold for the elastically deformable sealing element, the at least one elastically deformable sealing element can be received in a sealing receptacle in the closing piston, which runs along the circumferential direction of the closing piston and is particularly radially symmetrical. The sealing receptacle is preferably formed as a groove extending in an outer wall of the closing piston.

[0028] The at least one elastically deformable sealing element can, for example, be used as an O-ring in the seal receptacle. Alternatively, the elastically deformable 2024 PF00756

[0029] 5

[0030] The sealing element can be manufactured by injection molding, with suitable material injected directly into the sealing receptacle. This allows for better adhesion of the sealing element to the closing piston. If, on the other hand, the sealing element is prefabricated as an O-ring and inserted into the sealing receptacle, it can be bonded to the closing piston, particularly by adhesive bonding. It is especially preferred that at least one sealing receptacle is formed in the drive plate. This allows the at least one sealing element to be located near the point where the combustion gases are generated. Furthermore, this prevents combustion gases from damaging the surface of the connecting element. Another advantage is that the entire length of the connecting element can be used to establish the electrically conductive connection between the two contact elements.

[0031] Alternatively or in addition to at least one elastically deformable sealing element, the closing piston can be provided with at least one plastically deformable sealing element rotating along the circumference of the closing piston. The at least one plastically deformable sealing element can deform from the separation position to the contact position during the movement of the closing piston and subsequently retain this shape.

[0032] The at least one plastically deformable sealing element can project radially beyond the rest of the closing piston, at least in the separation position. In other words, the plastically deformable sealing element can have a larger diameter than the rest of the closing piston, at least in a region of the closing piston adjacent to the plastically deformable sealing element.

[0033] To achieve a simple design, at least one plastically deformable sealing element can be designed as a circular disk arranged between the propellant mirror and the connecting element. 2024 PF00756

[0034] 6

[0035] The desired plastic deformability combined with good sealing effect can be achieved, for example, by making at least one plastically deformable sealing element from a metal.

[0036] The at least one plastically deformable sealing element, particularly if it is made of metal, preferably has a thickness of 0.1 to 0.5 mm, more preferably 0.2 to 0.4 mm, and most preferably 0.3 ± 0.05 mm. To ensure that the at least one plastically deformable sealing element has sufficient space for deformation, the propellant mirror can be provided with a circumferential chamfer on its side facing the connecting element, against which at least an edge region of the plastically deformable sealing element can be applied during plastic deformation. The propellant mirror is preferably made of a high-performance plastic, preferably a plastic from the polyetherketone group, most preferably PEEK (polyetheretherketone). This ensures that the hot explosion gases do not destroy the propellant mirror.

[0037] For further explanation of the invention, reference is made in the following part of the description to figures from which further advantageous details and possible areas of application of the invention can be derived. The figures are to be understood as exemplary and are intended to illustrate the character of the invention, but in no way to restrict or even exhaustively represent it. The same reference numerals are always used for elements with the same structure and / or the same function.

[0038] They show:

[0039] Fig. 1 shows a schematic representation of an advantageous embodiment of the switch according to the invention in the disconnect position in a sectional view; and 2024 PF00756

[0040] 7

[0041] Fig. 2 shows a schematic representation of the switch from Fig. 1 in the contact position in a sectional view.

[0042] First, the construction of an advantageous embodiment of a switch 1 according to the invention is described with reference to Fig. 1. Fig. 1 shows the switch 1 in the disconnect position 3.

[0043] Switch 1 has a first contact element 5 and a second contact element 7. The two contact elements 5 and 7 are positioned opposite each other along a contact direction 9 and are spaced apart. The two contact elements 5 and 7 are fixed relative to each other. A submodule (not shown) typically has two submodule terminals. The two contact elements 5 and 7 can each be connected to one (other) of the two submodule terminals. An electrical connection between the contact elements 5 and 7 would then electrically connect the two submodule terminals to each other, thus bridging the submodule.

[0044] The first contact element 5 has a channel 11, the longitudinal axis 13 of which defines the contact direction 9. The channel 11 is enclosed by a wall 15, which is formed integrally with the first contact element 5 or electrically connected to it. The wall 15 is part of the first contact element 5 and is made of an electrically conductive material.

[0045] In contact direction 9, channel 11 narrows.

[0046] Preferably, but not necessarily, the channel 11 is divided into three sections arranged in the contact direction 9. In a first section 17, the channel 11 has a substantially cylindrical shape.

[0047] In a second section 19, which adjoins the first section 17 in contact direction 9, the channel 11 has a conical shape, tapering in contact direction 9. 2024 PF00756

[0048] 8

[0049] In a third section 21, which connects to the second section 19 in the contacting direction 9, there is again a cylindrical shape.

[0050] The conical second section 19 transforms the diameter 23 of the first section 17 into the diameter 25 of the third section 21. The diameter 25 is smaller than the diameter 23. Due to the described shape, the channel 11 can represent a conical barrel, as known from firearms.

[0051] The closing piston 27 is housed in channel 11. In the separation position 3, the closing piston 27 is spaced apart from the second contact element 7. The closing piston 27 can protrude from channel 11.

[0052] The closing piston 27 can be moved from the disconnect position 3 to a contact position 97, which is shown in Fig. 2. In the contact position 97, the closing piston 27 establishes an electrically conductive connection between the first contact element 5 and the second contact element 7.

[0053] The closing piston 27 is composed of several parts. At a rear end 29, which points away from the second contact element 7 in the contact direction 9, the closing piston 27 has a drive mirror 31.

[0054] Furthermore, the closing piston 27 has a connecting element 33 which extends from the drive mirror 31 in the contacting direction 9 and forms a front end 35 of the closing piston 27.

[0055] The propellant mirror 31 can also be referred to as the drive element. After the detonation of the detonative propellant charge 37, the propellant mirror 31 can be subjected to the pressure generated by the explosion and move the closing piston 27 towards the second contact element 7.

[0056] In the separation position 3, the propellant charge 37 is contained in a cavity 39. The cavity 39 is located on the 2024 PF00756

[0057] 9

[0058] end of the propellant mirror 31 pointing towards the contact direction 9. In other words, the cavity 39 extends from the rear end 29 into the propellant mirror 31 in the contact direction 9.

[0059] The propellant charge 37 can be ignited by a detonator 41 (indicated by hatching), which can be activated by appropriate control signals.

[0060] The propulsive mirror 31 is preferably made of a high-performance plastic, in particular PEEK.

[0061] (Polyethylethylketone) manufactured to withstand the detonation of the propellant charge and the intense heat generated.

[0062] The propulsion mirror 31 can have an essentially cylindrical shape, with an outer diameter 43 of the propulsion mirror 31 corresponding approximately to the inner diameter 23 of the first section 17 of the channel 11 .

[0063] At one end of the propellant mirror 31 opposite the connecting element 33, it can have a contact surface 45. The contact surface 45 has an outer diameter 47, which is larger than the outer diameter 43 of the rest of the propellant mirror 31.

[0064] The contact surface 45 can, in the separation position 3, bear against a stop 49 formed in the channel 11, thus preventing movement of the closing piston 27 towards the second contact element 7 before ignition of the propellant charge 37. The stop 49 can be formed by a step between the first section 17 and a further section 51 adjoining the first section 17 in the opposite direction of contact 9, the further section 51 having an inner diameter 53 that is larger than the inner diameter 23 of the first section 17.

[0065] During the movement of the closing piston 27 from the separating position 3 to the contact position 97, the contact surface 45 can be deformed or destroyed. The contact surface 45 can be a 2024 PF00756

[0066] 10

[0067] This represents a predetermined breaking point, because in contact position 97 the contact surface 45 is no longer needed.

[0068] The driving mirror 31 can have at least one, preferably several, sealing receptacles 57 in an outer wall 55. In the exemplary embodiment shown, the driving mirror 31 is provided with two sealing receptacles 57.

[0069] The sealing receptacles 57 are preferably each formed as a groove extending from the outside into the material of the drive mirror 31. Alternatively or additionally, a sealing receptacle 57 can be arranged in the connecting element 33. Preferably, however, the sealing receptacles 57 are part of the drive mirror 31.

[0070] The sealing receptacles 57 can rotate along a circumferential direction of the closing piston 27. Preferably, each sealing receptacle contains an elastically deformable sealing element 59, in particular an O-ring 61, which is elastically compressed between the drive mirror 31 and the wall 15 of the channel 11.

[0071] The closing piston 27 is preferably provided with a plastically deformable sealing element 63. In the exemplary embodiment shown, the plastically deformable sealing element 63 is provided in addition to the elastically deformable sealing elements 59, but can also be provided as an alternative to them. More than one plastically deformable sealing element 63 can also be provided. The plastically deformable sealing element 63 is preferably made of metal. It is particularly preferably made as a circular metal disc. The preferred thickness is 0.3 ± 0.05 mm. However, other thicknesses are also possible.

[0072] Preferably, the plastically deformable sealing element 63 is arranged between the drive mirror 31 and the connecting element 33. It can be clamped between the drive mirror 31 and the connecting element 33. The plastically 2024 PF00756

[0073] 11

[0074] The deformable sealing element 63 preferably projects radially beyond the drive mirror 31, at least in the separation position 3. That is, the plastically deformable sealing element 63 preferably has a diameter 65 that is larger than the diameter 43 of the drive mirror 31.

[0075] In order to provide space for the deformation of the plastically deformable sealing element 63, the drive mirror 31 can be provided on its side facing the connecting element 33 with a circumferential chamfer 67, to which at least an edge region of the plastically deformable sealing element 63 can be applied during plastic deformation.

[0076] The driving mirror 31 is preferably provided with a convex protrusion 69 at its end facing the connecting element 33. Preferably, the protrusion 69 extends over the entire diameter 43 of the driving mirror 31.

[0077] The connecting element 33 is provided at its end facing the driving mirror 31 with a concave recess 71 for the convex bulge 69. The convex bulge 69 and the concave recess 71 are preferably formed to be complementary in shape to each other.

[0078] The plastically deformable sealing element 63 between the drive mirror 31 and the connecting element 33 preferably has a shape that follows the curvature of the protrusion 69 and the receptacle 71.

[0079] The mutually complementary bulges 69 and 71 form a ball joint connection 73, which connects the drive mirror 31 to the connecting element 33 in a pivotal manner.

[0080] To prevent the connecting element 33 from detaching from the driving mirror 31, the driving mirror 31 can have a projection 75 that is received in a receptacle 77 in the connecting element 33. The projection 75 and receptacle 77 can form a plug connection between the driving mirror 31 and the connecting element 33. The plastically deformable 2024 PF00756

[0081] 12

[0082] The sealing element 63 can be provided with an opening through which the projection 75 protrudes.

[0083] The plug connection can be designed in such a way that it does not impede the relative movement of the driving mirror 31 and the connecting element 33. This can be achieved, for example, by making the projection 75 sufficiently flexible to allow the relative movement between the driving mirror 31 and the connecting element 33.

[0084] Alternatively or additionally, the projection 75 can serve as a predetermined breaking point and break upon ignition of the propellant charge 37 and movement of the closing piston 27 in the contact direction 9, so that the relative movement between the propellant mirror 31 and the connecting element 33 is not impeded. The projection 75 and the receptacle 77 are preferably arranged coaxially with the closing piston 27.

[0085] The connecting element 33 has an overall elongated shape and extends along the contact direction 9. The connecting element 33 can be divided into three sections, which are discussed below.

[0086] Starting from the driving mirror 31, the connecting element 33 has a first section 79 in which it tapers conically in the contact direction 9. The largest diameter 81 of the connecting element 33 in the first section 79 corresponds approximately to the inner diameter 23 of the first section 23 of the channel 11, wherein the first section 79 of the connecting element 33 is preferably received without play in the first section 17 of the channel 17 in the separation position.

[0087] A cylindrical second section 83 adjoins the first section 79 without any jumps or steps in the contact direction 9. The second section 83 of the connecting element 33 preferably has a diameter 85, which allows it to be received without play in the third section 21 of the channel 11. In the separation position 3, the 2024 PF00756

[0088] 13

[0089] second section 83 of the connecting element 33 from the first section 17 of the channel 11 through its second section 19 to the third section 21 .

[0090] At the end 87 of the connecting element 33, which points towards the second contact element 7 and simultaneously forms the front end 35 of the closing piston 27, a third section 89 is present. At this section, the connecting element 33 again has a conical shape and tapers towards the end 35. The third section 89 also joins the second section 83 of the connecting element 33 without any breaks or steps. In the disconnected position 3, the third section 89 can protrude at least partially from the channel 11 in the contacting direction 9.

[0091] The second contact element 7 is preferably provided with a conical receptacle 91 for the connecting element 33. The receptacle 91 is preferably shaped to be complementary to the third section 89 of the connecting element 33. The receptacle 91 tapers in the contact direction 9. The receptacle 91 is preferably arranged coaxially with the longitudinal axis 13 of the channel 11. The receptacle 91 may be closed off to the outside of the switch 1.

[0092] An electrically insulating enclosure 93 preferably extends between the first contact element 5 and the second contact element 7. This enclosure can seal the interior 95 of the switch 1 from the outside, preventing combustion gases generated by the detonation of the propellant charge 37 from escaping. It also prevents contamination of the interior 95 from the outside. The contact elements 5 and 7 can be screwed to the enclosure 93.

[0093] To close switch 1, the propellant charge 37 is ignited by the detonator 41 and detonated. The detonator 41 can receive a suitable control signal for this purpose. The detonation of the propellant charge 37 acts on the propellant mirror 31 and exerts pressure on the propellant mirror 31 in the contact direction 9. The propellant mirror 31 then moves 2024 PF00756

[0094] 14

[0095] the entire locking piston 27 in the contact direction 9. The locking piston 27 thereby moves into the contact position 97 .

[0096] Fig. 2 shows the switch 1 with the closing piston 27 in contact position 97. Compared to the disconnect position 3, the closing piston 27 is displaced in contact position 97 in the contacting direction 9.

[0097] The third section of the connecting element 33 is received in the contact position 97 in the receptacle 91 of the second contact element 7 .

[0098] Due to the high velocity generated by the detonation of the propellant charge 37, the connecting element 33 is pressed into the receptacle 91 with its third section 89. This allows a mechanically stable and electrically conductive connection to be established between the connecting element 33 and the second contact element 7. With its second section 83, the connecting element 33 rests against the conversion 15 in the third section 21 of the channel 11. Furthermore, the conical first section 79 of the connecting element 33 is received in the conical second section 19 of the channel 11 and can be pressed into it there.

[0099] By attaching the connecting element 33 to the conversion 15 of the channel 11, a good electrical connection is established between the connecting element 33 and the first contact element 5. In summary, in contact position 97, the first contact element 5 is electrically connected to the second contact element 7 via the connecting element 33 of the closing piston 27.

[0100] Both during the movement from the separation position 3 to the contact position 97 and in the contact position 97 itself, both the elastically deformable sealing elements 59 and the plastically deformable sealing element 63 retain their sealing effect. 2024 PF00756

[0101] 15

[0102] The elastically deformable sealing elements 59 are compressed between the drive mirror 31 and the wall 15 of the channel 11 in its first section 17. Likewise, the plastically deformable sealing element 63 is compressed between the closing piston 27 and the wall 15, forming a further barrier against combustion gases.

[0103] The sealing elements prevent combustion gases from entering the area between the connecting element 33 and the second contact element 7 at a time after the ignition of the propellant charge 31 but before the contact position 97 is reached. In this area, an arc is generated when the connecting element 33, which is already in contact with the first contact element 3, approaches the second contact element 7. If the combustion gases were to reach the arc, they could be forced out of the switch 1 due to further heating by the arc. This could damage other components of the power converter. The solution according to the invention prevents this. 2024 PF00756

[0104] 16

[0105] Reference sign

[0106] I Switch

[0107] 3 Separation position

[0108] 5 first contact element

[0109] 7 second contact element

[0110] 9 Contact direction

[0111] Channel II

[0112] 13 Longitudinal axis of the canal

[0113] 15. Conversion of the canal

[0114] 17 first section of the canal

[0115] 19 second section of the canal

[0116] 21 third section of the canal

[0117] 23 Inner diameter of the first section

[0118] 25 Inner diameter of the third section

[0119] 27 locking pistons

[0120] 29 rear end of the locking piston

[0121] 31 Driving mirrors

[0122] 33 Connecting element

[0123] 35 front end of the locking piston

[0124] 37 propellant charge

[0125] 39 Cavity

[0126] 41 detonators

[0127] 43 Outer diameter of the driving mirror

[0128] 45 m² of installation area

[0129] 47 Outer diameter in the area of ​​the contact surface

[0130] 49 attacks

[0131] 51 further section of the canal

[0132] 53 Inner diameter of the further section

[0133] 55 Outer wall of the driving mirror

[0134] 57 Seal receptacle

[0135] 59 elastically deformable sealing element

[0136] 61 O-ring

[0137] 63 plastically deformable sealing element

[0138] 65 Diameter of the elastically deformable sealing element 67 Circumferential chamfer of the driving mirror

[0139] 69 Convex bulge of the driving mirror

[0140] 71 Concave recess of the connecting element 2024 PF00756

[0141] 17

[0142] 73 Ball joint connection

[0143] 75 Lead of the driving mirror

[0144] 77 Intake in the connecting element

[0145] 79 first section of the connecting element

[0146] 81 largest diameter of the connecting element in the first section

[0147] 83 second section of the connecting element

[0148] 85 Diameter of the second section of the connecting element

[0149] 87 End of the connecting element pointing towards the second contact element

[0150] 89 third section of the connecting element

[0151] 91 Receptacle for the connecting element

[0152] 93 electrically insulating coating

[0153] 95 Inside of the switch

[0154] 97 Contact Position

Claims

2024 PF00756 18 Patent claims 1. Switch (1) for bridging a submodule of a power converter, wherein the switch (1) has a first contact element (5) and a second contact element (7) opposite the first contact element (5) along a contacting direction (9) and spaced apart from the first contact element (5), wherein the two contact elements (5, 7) are immovable relative to each other, and wherein a closing piston (27) is provided which, in a disconnected position (3), is held in a channel (11) in the first contact element (5) and, in a contact position (97), projects from the first contact element (5) into the second contact element (7) and electrically connects both contact elements (5, 7) to each other, wherein a detonative drive charge (37) is provided to to move the closing piston ( 27 ) from the separating position ( 3 ) to the contact position ( 97 ), characterized in that ,the closing piston ( 27 ) is composed of a propellant mirror ( 31 ) and an electrically conductive connecting element ( 33 ), wherein, at least in the separation position, ( 3 ) the propellant mirror ( 31 ) faces the detonative propellant charge ( 37 ) and the connecting element ( 33 ) faces the second contact element ( 7 ).

2. Switch ( 1 ) according to claim 1 , characterized in that the drive mirror ( 31 ) and the connecting element ( 33 ) are articulated together .

3. Switch (1) according to claim 2, characterized in that the drive mirror (31) and the connecting element (33) are connected to each other by a ball joint connection (73).

4. Switch (1) according to claim 3, characterized in that the connecting element (33) has a concave recess (71) and the driving mirror has a complementary convex protrusion (69), wherein the convex protrusion (69) is arranged in the concave recess (71). 2024 PF00756 19 5. Switch (1) according to one of claims 1 to 4, characterized in that the closing piston (27) is provided with at least one elastically deformable sealing element (59) circumferentially along a circumferential direction of the closing piston (27).

6. Switch ( 1 ) according to claim 5 , characterized in that the at least one elastically deformable sealing element ( 59 ) is received in a sealing receptacle ( 57 ) circumferentially in the closing piston ( 27 ).

7. Switch ( 1 ) according to claim 6 , characterized in that the at least one sealing receptacle ( 57 ) is arranged in the drive mirror ( 31 ).

8. Switch (1) according to one of claims 1 to 7, characterized in that the closing piston (27) is provided with at least one plastically deformable sealing element (63) circumferentially along the circumferential direction of the closing piston (27).

9. Switch (1) according to claim 8, characterized in that the at least one plastically deformable sealing element (63) projects radially beyond the remaining closing piston (27) at least in the separating position (3).

10. Switch ( 1 ) according to claim 8 or 9 , characterized in that the at least one plastically deformable sealing element ( 63 ) is designed as a circular disk arranged between the drive mirror ( 31 ) and the connecting element ( 33 ).

11. Switch ( 1 ) according to one of claims 8 to 10 , characterized in that the at least one plastically deformable sealing element ( 63 ) is made of a metal .

12. Switch (1) according to one of claims 8 to 11, characterized in that the drive mirror (31) is provided on its side facing the connecting element (33) with a circumferential chamfer (67) to which at least one 2024 PF00756 20 The edge area of ​​the plastically deformable sealing element ( 63 ) can be applied during plastic deformation.

13. Switch ( 1 ) according to one of claims 1 to 12 , characterized in that the driving mirror (31 ) is made of a high-performance plastic, preferably of a plastic from the group of polyetherketones, particularly preferably of PEEK (polyetheretherketone) .

14. Submodule for a power converter comprising at least one switch ( 1 ) according to any one of claims 1 to 13.

15. Power converter with at least one submodule according to claim 14.

Images