EP2801100B1 - Switchgear arrangement - Google Patents

Description

The invention relates to a switching device arrangement comprising an interrupter unit having a first switching contact piece and a second switching contact piece, which are movable relative to each other, as well as with an emerging in a formable between the switching contact pieces switching path switching gas channel which passes through the interrupter unit and the switching path with the environment of Interrupter unit connects and at least partially limited by embracing elements in the manner of an annular channel.

A switchgear assembly according to the preamble of claim 1 is known from DE 10 2009 057 703 A1 known.

Another switching device arrangement is for example from the patent DE 102 21 580 B3 known. The local switching device arrangement has an interrupter unit with a switching path, which can be formed between a first and a second switching contact piece. A switching gas gas channel originates in the switching path. The switching gas channel extends through the interrupter unit and connects the switching path to an environment surrounding the interrupter unit. The switching gas channel is formed in sections from each other encompassing elements, whereby the switching gas channel is partially formed in the manner of an annular channel.

In order to extend the flow path with axial limitation, a change of direction of the switching channel is provided in the known arrangement. In order to effect the change of direction, different elements overlap each other, wherein in each case in the region of the overlap each screwing and connecting the elements is provided. As a result, a warp-resistant structure is created, which gives the interrupter unit stability. However, in the connection region, the cross section of the switching gas channel is reduced. Thus arise in the course of the switching gas channel sections with an increased Flow resistance. At these points, it comes to congestion of outflowing switching gas, which can develop backwash within the interrupter unit. Such backwater waves can strike back into the switching path, whereby the switching behavior of the switching device arrangement is affected.

Thus, it is an object of the invention to provide a switching device arrangement which allows an improved outflow of switching gas from the switching path.

This is achieved according to the invention in a switching device arrangement according to claim 1.

An annular channel is a channel which, for the flow of a gas, provides a cross-section which is closed in a closed ring around a central section. Such annular channels may, for example, have an annular cross-section, but in addition also have arbitrarily otherwise shaped strip-shaped self-contained cross sections. For example, an annular channel can also have an oval ring cross section, a polygonal ring cross section or other ring shapes in cross section. An annular channel offers the possibility to centrally provide a space for receiving assemblies and to coat these modules on all sides with the switching gas channel, so that the largest possible cross section for discharging switching gas from the switching path is available. The switching gas channel has an inlet opening in the region of the switching path in order to be able to absorb switching gas from the switching path. Through the inlet opening, switching gas flows into the switching gas channel. An inlet opening may for example be at least partially bounded by one of the switching contact pieces.

It is also possible to entangle the switching gas channel in itself and, for example, by reversing the direction of the switching gas channel from a central area in the annular area to redirect and to achieve a flow path extension. It can also be provided that a plurality of successive annular sections of the switching gas channel encompass each other.

About the switching gas channel occurring switching gases can be derived during a switching operation in the switching path. The switching section is the section / space of the interrupter unit within which a contacting / disconnection of contact areas of the relatively movable switching contact pieces takes place. The switching path may be surrounded by a switching chamber, so that an optionally burning in the switching path arc is covered by a wall.

A switching operation is initiated by a relative movement of the switching contact pieces to each other. The switching contact pieces are, for example, movable relative to one another in order to interrupt a current path or to produce a current path. For this purpose, the switching contact pieces for interrupting an existing galvanic contacting are removed from each other and moved toward a switching to each other until a sufficient galvanic contacting of the switching contact pieces is present. During a switching process, an arc can be ignited. The switching contact pieces may preferably be formed as power contact pieces. Power contact pieces are switching contact pieces, which are adapted to guide an arc on their surfaces, the choice of material for the switching contact pieces is such that a thermal action of the arc is possible resisted. For example, it can be provided that the switching contact pieces are designed as so-called arcing contact pieces, which are arranged electrically parallel to rated current contact pieces. The arc contact pieces have the task at a switch-on Contact each other in time before the rated current contact pieces and to disconnect at a turn-off time after the rated current contact pieces. This ensures that during a switch-on a Einschaltlichtbogen preferably occurs at the arcing contact pieces / switching contact pieces and resulting in a Ausschaltvorgang Ausschaltlichtbögen are also preferably performed on the arcing contact pieces / switching contact pieces.

An arc / switching arc heats its surroundings. Overheating and expansion of gases and / or evaporation of solids or liquids can occur. The heated medium is called switching gas and preferably discharged via the switching gas channel from the switching path. The switching gas channel discharges the switching gas from the interior of the interrupter unit into the vicinity of the interrupter unit. This ensures that the switching gas, which may also contain burn-off products, soot particles and other undesirable impurities, does not settle anywhere within the interrupter unit. Preferably, a large proportion, if possible the entire switching gas, is led out of the interrupter unit. The switching gas channel is arranged within the interrupter unit.

For example, it can be provided that the switching contact pieces are surrounded by an electrically insulating fluid. In this case, for example, insulating liquids such as oils and esters but also insulating gases such as sulfur hexafluoride gas and nitrogen gas can be used. Advantageously, the fluid which surrounds the switching contact pieces can be under an overpressure. Due to the overpressure, the electrical strength of the electrically insulating fluid can be additionally increased. It can be provided that the interrupter unit is surrounded by an encapsulating housing, within which the electrically insulating fluid is enclosed. Thus, an uncontrolled volatilization of the electrically insulating fluid from the interrupter unit is difficult. The environment of the interrupter unit is limited by the encapsulating housing, ie, the interrupter unit itself is arranged within the encapsulating housing. The electrically insulating fluid flows around and flushes through the interrupter unit. There is an insulation gap between the interrupter unit and the encapsulating housing which acts as an electrical insulator by the electrically insulating fluid. The area for receiving the fluid between the interrupter unit and the encapsulating housing is the environment of the interrupter unit. Thus, it is possible to derive the contaminated switching gas via the switching gas channel from the interrupter unit in its environment and there to allow swirling and mixing there befindlichem electrically insulating fluid. Thereby, a weakening of the electrical insulation of the interrupter unit can be reduced to an acceptable level.

Due to the pipe socket-like design of a first body, which is clamped at the end, it can protrude with its free end as self-supporting and free of other attachments with its free end in the direction of the switching path. As a result, a wall is provided, on which the switching gas can flow as low as possible inside and / or outer shell side along. An end-side clamping is given when the body, based on a longitudinal axis, outside of a central region is clamped and held on one side. The first body is supported and supported by the restraint. Preferably, the first body is positioned exclusively via an end clamping. A holding of the first body is preferably carried out at a front end. Thus, the pipe socket-like first body can freely project into a volume which is flooded, for example, with electrically insulating fluid. If the first body carries itself exclusively, this can only contribute to a limited mechanical stabilization or stiffening of the interrupter unit. The body can provide a wall for limiting the switching gas channel inside the interrupter unit. The resistance of the first body is to be designed such that a sufficient resistance to the inflowing or inflowing switching gas is given. This switching gas can have a temperature increase of several 100 ° C and also bounce with an overpressure against the first body.

By way of example, the first body can have a hollow-cylindrical structure, wherein a cylinder axis corresponds to the longitudinal axis of the body. The first body may be formed of electrically conductive material. Preferably, the body can be designed rotationally symmetrical cylindrical, so that it substantially corresponds to a hollow cylinder with circular cross-section, which is clamped at the end and projects as a nozzle freely into a room. Preferably, a pipe socket both inner shell side and outer shell side define the path of the switching gas channel. A flow through a hollow cylindrical body may be provided on the inner shell side as well as on the outer shell side with an opposite sense of direction (for example along a cylinder axis). In addition, unlike a cylindrical shape may be provided any other shape of the body, which extends along an axis of its clamping in the direction of the switching path and between the first body and a encompassing element or an encompassed element an annular channel of any cross-section is limited.

A further advantageous embodiment may provide that the first body is encompassed by a collar acting as an element, which spans the free end of the first body.

A wrap surrounds and covers the first body on the outer shell side, so that the first body is protected against direct access from the outside. Advantageously, the cap should limit the outer contour of the interrupter unit at least in sections, wherein the switching gas channel in the environment of the interrupter unit opens. The wrap surrounds a longitudinal axis of the first body. The cap extends beyond in the axial direction at least the free end of the first body. In particular, the cover can completely overhang / span the first body in the axial direction. The throw-over can in particular advantageously be designed bell-shaped, so that in a bottom area a further radial extent of the throw is given as at an opposite tapered end, so that the throw covers the first body on the shell side and on the other at the tapered end at least partially frontally , The cover may have a conical contour. In addition, the bottom region may have a radially expanding projection. The cover can be formed substantially rotationally symmetrical and be aligned substantially coaxially to a longitudinal axis of the interrupter unit. The throw-over can serve, for example, to open the switching gas channel in the vicinity of the interrupter unit. A mouth opening of the switching gas channel can thus be arranged on the cover, so that the mouth opening has a, for example, substantially annular or ring-segment-shaped form. The mouth opening may preferably be aligned coaxially to the longitudinal axis of the interrupter unit. A leakage of switching gas into the environment should preferably take place in the direction of the longitudinal axis. Advantageously, the first body and the cover should be rotationally symmetrical. By a coaxial arrangement of the first body and union so a uniform shaping of the cross section of the switching gas channel can be done. At the free end of the first body, which is surmounted, for example, by the throw both in the axial and in the radial direction, it is possible to redirect the switching gas channel in its direction sense and make a deflection by, for example, twice 90 °. For example, the switching gas channel may extend substantially along a longitudinal axis, wherein alternately an extension of the switching gas channel may be provided with different sense of direction along the longitudinal axis. For example, a meandering of the switching gas channel be effected. It may also be provided, in particular in a coaxial design of the structures, to initially run the switching gas channel concentric and to force a radial jump of the switching gas channel with a change in direction, so that, starting from a center, for example, a plurality of hollow cylindrical sections of the switching gas channel are arranged in a shell shape following one another , Thus, for example, the wall of the first body on the inner shell side and outer shell side drive the switching gas channel in a first direction (for example, in the direction of the longitudinal axis), wherein the inner shell side and outer shell side of the switching gas channel extends with opposite sense of direction.

A further advantageous embodiment may provide that on the union a second body acting as an element is clamped, which protrudes pipe-socket-like with a free end in the direction of the first body.

By a second body, which is also formed like a pipe socket, the possibility is given to clamp the first body and the second body each end, wherein free ends of the first and second bodies zuagen on each other. Thus, it is possible to design a shell-like, radially expanding switching gas channel. The walls of the first and the second body, which serve to divide the interior of the throw in different distances of the switching gas channel, so freely against each other protrude. The interior of the throw remains free of holding and supporting elements. Thus, the switching gas channel between the end-side restraints of the first and second body can be formed according to low flow resistance. The restraint of the second body serves to support and position the second body on the cap. Advantageously, this is the only holder for the second body. The end clamps may be positioned at opposite ends of the two bodies. Especially when using rotationally symmetric structures for the first and the two bodies, the two bodies can be aligned coaxially to one another, so that holding and positioning of the two bodies is provided at opposite ends on the first body and on the second body. Thus, the space located between the end-holding points of the first and second body space can be filled almost freely selectable with walls for shaping the switching gas channel. The design of the second body is not limited to a pipe socket. For example, only a portion of the second body may be formed like a pipe socket, wherein the pipe socket-like portion of the second body of the clamping freely protrudes into the room. On the second body, moreover, further moldings can be provided beyond that. The same applies to the first body. The second body, like the first body, may be electrically conductive. Body castings have proved to be advantageous.

A further advantageous embodiment can provide that mutually facing free ends of the first and second body overlap each other.

If the first and second bodies overlap one another with their free ends, an additional travel extension of the switching gas channel in the interior of the interrupter unit is made possible in a simple manner. For example, the second body may be surrounded on the outer shell side of the first body. However, it can also be provided that the first body is surrounded on the outer shell side of the second body. In the axial direction, there is an overlap of the two bodies, so that here a section can be formed, in which the switching gas channel is limited in the manner of an annular channel between the first and second body. Advantageously, it should be provided that both the first body and the second body and the throw are arranged so as to be stationary relative to one another. As a result, the geometry of the switching gas channel is maintained and switching gas can be removed along the Schaltgaskanals from the switching path in the environment of the interrupter unit.

Overlapping of the two bodies can be more or less pronounced as needed, so that a ring-channel-shaped portion of the switching gas channel between the first and second body in the axial direction can be made more or less long.

A further advantageous embodiment may provide that the cap is supported on the first body.

Supporting the cap makes it possible, for example, to support the first body in an electrically insulated manner, the cap in turn being supported on the first body. Thus, the attachment of the first body and the attachment of the throw can be made in each case on the same end region of the throw or the first body. The cap and the first body may have the same electrical potential. An opening of the switching gas channel can be provided in the region of the support of the throw on the first body. Advantageously, the mouth opening between the first body and cover of these can be limited. Advantageously, the cover can be supported exclusively on the first body and be supported by this.

Furthermore, it can be advantageously provided that the second body carries a contact piece.

The second body can advantageously serve as a contact carrier for switching contact pieces, so that the switching path, ie, the region in which a switching path is located between the switching contact pieces, extend to / in the first body and may be limited by the first body. The second body may, as well as the throw, be part of the current path to be switched by the switching device arrangement. A switching contact piece carried by the second body may be designed as a rated current contact piece, arcing contact piece, etc.

A support of the second body on the cap makes it possible to use the cap as a supporting structure for the second body, the cap itself is stored stationary. For example, it is possible to connect at opposite ends (relative to a longitudinal axis) of the throw over the union at one end with the first body, clamp and connect the second body at the other opposite end of the throw with the cover and clamp. Thus, the cover can form a portion of the interrupter unit as an outer envelope contour. The cap may serve as a supporting structure for the second body and further provide a wall for forming the switching gas channel.

According to the invention, it is provided that the first body has on the shell side at least one recess which is covered by the union in the radial direction.

By introducing at least one recess into the first body, it is possible to arrange bypasses in the course of the switching gas channel, so that parts of the switching gas channel passing switching gas are passed on shortened distances from the switching path in the direction of the mouth opening of the switching gas channel of the interrupter unit. Thus, it is possible, for example, within the switching gas channel prior to the occurrence of a switching action existing electrically insulating gas swirl as quickly as possible on a large length of the switching gas channel with the outflowing switching gas and to put. The shell-side recess may extend, for example, in the form of a slot or a circular recesses through the first body, wherein due to the arrangement of the throw in the radial direction, ie, in Schaltgasdurchtrittsrichtung through the recess, the recess is covered spaced from the cap. Thus, a deflection and deflection of the switching gas is given and prevents direct radial outflow of the switching gas into the environment.

A further advantageous embodiment can provide that the first body is supported electrically insulated on a housing surrounding the interrupter unit.

A support of the first body to a housing surrounding the interrupter unit makes it possible to position further modules starting from the first body. Thus, for example, be supported on the first body of the cap, which in turn is supported on the throw of the second body. This results in a chain of support points, which are indeed spaced from each other, but are arranged on one and the same common support mechanism angularly rigid to each other. For electrically insulated support, the use of an insulating body may be provided. For example, a columnar post insulator may be used. By way of example, the housing may be an encapsulating housing which encapsulates and hermetically seals a fluid which surrounds the interrupter unit and flushes through it. The electrically insulating insulator extends through the surroundings of the interrupter unit, which is located between interrupter unit and encapsulating housing and is filled with the electrically insulating fluid.

Furthermore, it can be advantageously provided that the cover is supported in an electrically isolated manner on a housing surrounding the interrupter unit.

The cap can be supported directly on the surrounding housing. In this case, the union can be supported directly on the housing. However, it may be provided an indirect support of the cap on the housing. For example, the union may be formed as part of a current path for supplying an electric current to the switching contact pieces, wherein the union angle is rigidly connected to further current path sections, which in turn are supported on the encapsulating. Thus, the union can also be indirectly supported via other modules electrically isolated from the housing.

In the following, an embodiment of the invention is shown schematically in a drawing and described in more detail below.

Figur

einen Schnitt durch eine Schaltgeräteanordnung mit einer Unterbrechereinheit.

It shows the

figure

a section through a switching device arrangement with an interrupter unit.

The switching device arrangement has a housing 1. In the present case, the housing 1 is designed as a hermetically sealable encapsulating housing, which accommodates an interrupter unit 2 in its interior. In the present case, the housing 1 is designed as a metallic cast housing, which provides a fluid-tight wall. The interior of the housing 1 is filled with an electrically insulating fluid, for example an electrically insulating gas, such as sulfur hexafluoride or nitrogen. Preferably, the housing 1 should be formed as a pressure vessel, so that the fluid located in the interior can also be placed under an overpressure. The housing 1 has a first neck 3 and a second neck 4. It is possible, through the sockets 3, 4, a first and a second current path section 5a, 5b, each electrically isolated and spaced to introduce the housing 1 in the interior of the housing 1. The current path sections 5a, 5b can be electrically contacted with one another via the interrupter unit 2 of the switching device arrangement, or a connection between the two current path sections 5a, 5b can be interrupted by means of the interrupter unit 2. Not shown in the figure is the fluid-tight closure of the housing 1 with respect to the current path sections 5a, 5b. For example, the sockets 3, 4 can be closed by means of electrically insulating subassemblies (which are respectively penetrated by the current path sections 5a, 5b), so that the interior of the housing 1 is hermetically sealed. As electrically insulating assemblies, for example, outdoor bushings can be provided which an integration enable the switching device arrangement, for example in an outdoor switchgear.

The housing 1 is subjected to ground potential and supported by support feet on a foundation. Inside the housing 1, the interrupter unit 2 is arranged. The interrupter unit 2 extends along a longitudinal axis 6. The interrupter unit 2 has a first switching contact piece 7 and a second switching contact piece 8. The first switching contact piece 7 is formed here bolt-shaped and aligned substantially coaxially to the longitudinal axis 6. The second switching contact piece 8 is formed bush-shaped and also arranged coaxially to the longitudinal axis 6. The contact areas of the first and second switching contact piece 7, 8 are facing each other, the dimensioning of the first and second switching contact piece 7, 8 is selected such that in a relative movement of the two switching contact pieces 7, 8 along the longitudinal axis 6, the bolt-shaped first switching contact piece 7 in the socket-shaped second switching contact piece 8 is retractable.

The two switching contact pieces 7, 8 are formed as arcing contact pieces of the switching device arrangement. Accordingly, the first switching contact piece 7 is supplemented by a first rated current contact piece 9. The second switching contact piece 8 is supplemented by a second rated current contact piece 10. The first switching contact piece 7 and the first rated current contact piece 9 and the second switching contact piece 8 and the second rated current contact piece 10 are electrically contacted with each other, so that associated contact pieces permanently lead the same electrical potential. In the present case, the rated current contact pieces 9, 10 are tubular and aligned coaxially to the longitudinal axis 6, wherein the switching contact pieces 7, 8 are encompassed by their respective associated rated current contact piece 9, 10 outer jacket side. During a switch-on process, it is provided that firstly the switch contact pieces 7, 8 contact one another, whereupon subsequently the two rated current contact pieces 9, 10 contact one another. At a Switching operation, a separation of the rated current contact pieces 9, 10 is initially provided, followed temporally following a separation of the switching contact pieces 7, 8 takes place. During a switch-on process, the switching contact pieces 7, 8 are in front of the rated current contact pieces 9, 10. When switching off the switching contact pieces 7, 8 with respect to the two rated current contact pieces 9, 10 after. The switching contact pieces 7, 8 and the rated current contact pieces 9, 10 are each held electrically isolated from the housing 1 spaced.

The second rated current contact piece 10 is slidably mounted in a sliding bushing 11 along the longitudinal axis 6. The slide bushing 11 is electrically conductively connected to the second rated current contact piece 10. The sliding bush 11 is equipped with a circular cylindrical cross section and arranged coaxially to the longitudinal axis 6. Outer shell side, a first support insulator 12a is struck on the sliding bushing 11, which holds the sliding bush 11 on the shell side with respect to the housing 1 electrically isolated. The second rated current contact piece 10 and the second switching contact piece 8 are arranged rigidly in relation to each other. Accordingly, a movement of the second rated current contact piece 10 is accompanied by a movement of the second switching contact piece 8.

For coupling a movement into the interior of the housing 1 and for effecting a relative movement between the two switching contact pieces 7, 8, a wall of the housing 1 is penetrated by a shaft 13 in a fluid-tight manner. The shaft 13 is rotatably supported, so that a drive movement can be transmitted in a fluid-tight manner into the interior of the housing 1 via a drive device arranged on the outside of the encapsulation housing 1. On the shaft 13, a pivot lever 14 is arranged on the inside wall side. About the pivot lever 14 is by means of a connecting rod 15, a rotational movement of the shaft 13 in a linear movement along the longitudinal axis 6 changeable. The connecting rod 15 is connected to the second rated current contact piece 10. Thus, it is possible that second rated current contact piece 10 and the second switching contact piece 8 guided along the longitudinal axis 6 in the sliding bush 11 to move. On the slide bush 11, a contact region is arranged to electrically conductively contact the second current path section 5b via the sliding bush 11 with the second rated current contact piece 10 and the second switching contact piece 8, respectively.

For positioning the first rated current contact piece 9 and the first switching contact piece 7, a cap 16 is provided. The cap 16 has a bell-shaped structure, with the cap floor radially expanding at its end remote from the second rated current contact piece 10 and the second switching contact piece 8, respectively. On the jacket side, a contact region is arranged on the cap 16, into which the first current path section 5 a protrudes, so that the cap 16 can be electrically contacted. The cover 16 is thus part of a current path to be switched. The wrapper 16 is formed substantially rotationally symmetrical, wherein the axis of rotation is arranged congruent to the longitudinal axis 6.

Furthermore, a second support insulator 12b is provided, which in the present case is designed as a rotationally symmetrical hollow support and is arranged coaxially to the longitudinal axis 6. On the second support insulator 12b, a first body 17 is struck, wherein the first body 17 is formed substantially rotationally symmetrical and coaxial with the longitudinal axis 6 is aligned. On the first body 17 turn the cap 16 is struck. The cap 16 surrounds the first body 17 on the outer shell side. The cover 16 may also be supported directly on the second support insulator 12a and the first body 17 may be supported on the cover 16. It is also possible for both the union 16 and the first body 17 to be supported directly on the second support insulator 12a. The first body 17 is designed like a pipe socket, wherein the pipe socket is fixed end and with its free end in the direction of the switching path, which is formed between the switching contact pieces 7, 8 and the Nennstromkontaktstücken 9, 10, free in the interior of the cap 16 protrudes. The first body 17 is closed end face in the region of its clamping. Relative to the longitudinal axis 6, supporting of a second body 18 on the cap 16 is provided on the end opposite the connection of the cap 16 with the first body 17. The cap 16 surrounds the second body 18 on the outer shell side, wherein the second body 18 is partially formed as a pipe socket. The second body 18 or the pipe socket has an inlet opening of the switching gas channel. In the present case, the inlet opening is at least partially limited by the rated current contact piece 9. The second body 18 is clamped on the cap 16, so that a pipe socket-like portion is fixed. With a free end of the pipe socket-like portion of the second body 18 projects toward the free end of the first body 17th

The second body 18 serves as a carrier for at least one contact piece. In the present case, the first switching contact piece 7 and the second rated current contact piece 9 are supported on the second body 18. The second body 18 positions elastically deformable contact fingers so as to form a contact area of the first rated current contact piece 9. Accordingly, the second body 18 is part of a switching current path of the switching device arrangement. The two bodies 17, 18 overlap each other with their respective ends of their pipe socket-like sections free of their clamping points. It is provided that the second body 18 protrudes into the first body 17 and the outer shell side is encompassed by the first body 17. The second body 18 engages around a switching gas channel, which continues from the switching path and projects into the interior of the first body 17. In the region of the overlap of the two bodies 17, 18, a deflection of the switching gas channel is provided, wherein between the two bodies 17, 18 of the switching gas channel has a portion with ring-channel-shaped structure. Furthermore, between the outer shell of the second body 18 and the inner shell of the cap 16, a further portion of the switching gas channel is formed, which is formed annular channel-shaped. In the course of the switching gas channel, a portion of the switching gas channel is formed between the outer shell of the first body 17 and the inner surface of the cap 16, which also has a ring-channel-shaped structure. In the region of the attachment of the first body 17 to the second support insulator 2b, an opening of the switching gas channel is provided in the vicinity of the interrupter unit 2. The mouth opening of the switching gas channel is preferably formed annularly and preferably aligned coaxially to the longitudinal axis 6 lying. Instead of an annular structure and one or more segments of a circular ring can be used as a mouth opening.

The first body 17 has a plurality of recesses 19 on the shell side. The recesses 19 are aligned substantially radially to the longitudinal axis 6, so that a radial outflow direction is defined for emerging through the recesses 19 switching gas. The recesses 19 are each covered on the outer shell side of the cap 16, so that bouncing through the recesses 19 passing switching gas against the cap 16 and there swirled and deflected.

The second switching contact piece 8 is enclosed on the outer jacket side by an insulating material nozzle 20. The insulating material 20, in turn, is encompassed on the outer shell side by the second rated current contact piece 10. The insulating material nozzle 20 has an insulating material nozzle channel, in which the first switching contact piece 7 is movable in order to be able to come into contact with the socket-shaped contact region of the second switching contact piece 8. In the present case, it is provided that both the first and the second switching contact piece 7, 8 are mounted in a movable manner, in order to effect a relative movement of the switching contact pieces 7, 8 to each other. In the rated current contact pieces 9, 10, however, only a movable mounting of the second rated current contact piece 10 is provided, whereas the first rated current contact piece 9 is fixed in place on the cap 16. To drive the first switching contact piece. 7 a deflection gear 21 is provided, which is connected via a coupling rod 22 which is connected to the insulating material 20. A movement of the second rated current contact piece 10 leads to a movement of the coupling rod 22. A movement of the coupling rod 22 is transmitted to the first switching contact piece 7 via a coupling gear 21. The coupling gear 21 reverses the sense of direction of the movement of the coupling rod 22. The use of an insulating nozzle 20, which is movable together with the second rated current contact piece 10 and the second switching contact piece 8, can be used to transmit a movement to the first switching contact piece 7 in an electrically insulated manner. During a switch-on process, the second rated current contact piece 10 and the second switch contact piece 8 are moved in the direction of the first rated current contact piece 9 or of the first switch contact piece 7. About the Isolierstoffdüse 20, the coupling rod 22 and the reversing gear 21, a movement with opposite sense of direction is transmitted to the first switching contact piece 7, so that an increase in the contacting speed of the two switching contact pieces 7, 8 takes place. This ensures that the switching contact pieces 7, 8 in time before the Nennstromkontaktstücken 9, 10 touch each other, so that Einschaltlichtbögen are preferably performed on the switching contact pieces 7, 8. During a switch-off operation, the second rated current contact piece 10 and the second switch contact piece 8 and the insulating material nozzle 20 attached to it move away from the first switch contact piece 7 and the first rated current contact piece 9. In this case, there is first a separation of the two rated current contact pieces 9, 10 from each other and in time there is a separation of the two switching contact pieces 7, 8 from each other. Accordingly, a commutation of a breaking current of the rated current contact pieces 9, 10 takes place on the switching contact pieces 7, 8. A possibly igniting arc is performed between the switching contact pieces 7, 8. Due to the design of the insulating material 20, an arc is preferably held within this insulating material 20. Generating switching gas preferably flows in the direction of the first switching contact piece 7. The switching gas is flowed into the switching gas channel, which is initially limited by the second body 18. The switching gas is blasted in the direction of the longitudinal axis 6. By a further prevailing in the switching path pressure overflow, a return flow of the switching gas is prevented. The switching gas then flows along the path of the switching gas channel against a closed end face of the first body 17 and is deflected and directed on the one hand by the recesses 19 of the first body 17 radially outward. On the other hand, however, also pressed by the annular channel-shaped overlap region between the first and the second body 17, 18. From there, the switching gas continues to flow through the annular channel-shaped portion which is formed between the outer circumferential surface of the second body 18 and the inner circumferential surface of the cap 16 to flow from this area again by reversing the sense of direction through a ring-channel-shaped portion of the switching gas channel, which between the outer circumferential surface of the first body 17 and the inner circumferential surface of the cap 16 is limited. Finally, the switching gas flows from the interrupter unit 2 after a repeated change of the sense of direction and flows into the environment of the interrupter unit 2. There, the switching gas can be further mixed and swirled with electrically insulating fluid located in the vicinity of the interrupter unit 2.

Claims (8)

1. Switchgear arrangement having an interrupter unit (2) comprising a first switching contact piece (7, 9) and a second switching contact piece (8, 10), which are movable relative to one another, and comprising an arcing gas channel, which develops in an arc gap which can be formed between the switching contact pieces (7, 8, 9, 10), which arcing gas channel passes through the interrupter unit (2) and connects the arc gap to the surrounding environment of the interrupter unit (2) and is at least sectionally delimited by mutually encompassing elements in the manner of a ring channel, wherein a first body (17), clamped in at one end in the manner of a pipe connection piece, as one element protrudes with a free end towards the arc gap,
   characterized in that
   the first body (17) has, on the lateral surface side, at least one cutout (19) covered by a sheath (16) in the radial direction.
2. Switchgear arrangement according to Claim 1,
   characterized in that
   the first body (17) is encompassed by a sheath (16) acting as element, which sheath spans the free end of the first body (17).
3. Switchgear arrangement according to Claim 1 or 2,
   characterized in that
   a second body (18) acting as element is clamped in at the sheath (16), which second body protrudes in the manner of a pipe connection piece, with a free end in the direction of the first body (17).
4. Switchgear arrangement according to Claim 3,
   characterized in that
   free ends protruding towards one another of the first and second bodies (17, 18) overlap one another.
5. Switchgear arrangement according to one of Claims 2 to 4,
   characterized in that
   the sheath (16) is supported on the first body (17).
6. Switchgear arrangement according to one of Claims 3 to 5,
   characterized in that
   the second body (18) bears a contact piece (7, 9).
7. Switchgear arrangement according to Claims 1 to 6,
   characterized in that
   the first body (17) is supported, electrically insulated, on a housing (1) surrounding the interrupter unit (2).
8. Switchgear arrangement according to Claims 2 to 7,
   characterized in that
   the sheath (16) is supported, electrically insulated, on a housing (1) surrounding the interrupter unit (2).

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