EP2740137B1 - Arrangement comprising a circuit breaker interrupter unit - Google Patents

Description

The invention relates to an arrangement comprising a circuit breaker interrupter unit with a arranged between a first and a second arcing contact switching path and an opening in the switching path and on the other hand in a Schaltgasausströmöffnung the circuit breaker unit switching gas channel, which at least partially from a first and a second pipe section, the one another in axial Overlap direction in an overlap section is limited and each have relief openings in their lateral surfaces, wherein freely continuous relief openings in the first and in the second pipe section are arranged axially offset from each other.

An arrangement with a circuit breaker breaker unit is for example from the German utility model DE 1 889 068 known. There, a circuit breaker breaker unit is referred to as a tube extinguishing chamber, which has a switching path between arcing contact pieces. In order to allow switching gas generated in the switching path to escape to the outside, the arrangement there is equipped with a switching gas channel which, on the one hand, opens into the switching path and, on the other hand, in a switching gas outlet opening of the local tube extinguishing chamber. The switching gas channel is partially bounded by a plurality of pipe sections which overlap each other in an axial direction and form an overlapping section. In the lateral surfaces of the pipe sections discharge openings are arranged in each case.

In this case, the use of a plurality of pipe sections is provided in the known arrangement, which each have a number of relief openings, each arranged in the axial direction in alignment in the respective lateral surface are. The pipe sections are arranged coaxially to an axis, wherein the discharge openings of the individual pipe sections are rotated about the axis to each other. An immediate violation of switching gas from a discharge opening into another discharge opening is prevented. Thus, a frequent deflection of the switching gas is enforced. Although this achieves a good swirling of the switching gas, the flow resistance of the switching gas channel also increases with it.

A high flow resistance precludes rapid discharge of large amounts of switching gas.

From the document CA 913 152 A a circuit breaker unit is known, which has a switching gas channel which is limited in sections by a first and a second pipe section which overlap each other in the axial direction. The lateral surfaces of the pipe sections each have discharge openings, wherein the discharge openings in the first and in the second pipe section are arranged axially offset from one another. An axial offset is achieved by a different perforation of the pipe sections, so that a certain flow path is set for flowing within the Schaltgaskanales switching gas. Such a configuration of the pipe sections forces for a modification of the flow path, vorzuhalten variously perforated pipe sections and, if necessary, combine them together. Making different types of pipe sections and storage of the same leads to increased costs.

In this respect, it is an object of the invention to provide an arrangement with a circuit breaker breaker unit such that the course of the switching gas channel can be inexpensively and easily modified.

According to the invention this object is achieved in an arrangement of the type mentioned in that at least in one of the pipe sections one, in particular a plurality of relief openings are closed by a valve body.

A circuit breaker breaker unit is the part of an electrical switching device. The circuit breaker breaker unit has active parts of the electrical switching device to interrupt an electric current or turn on an electric current. For this purpose, the circuit breaker interrupter unit has, for example, arcing contact pieces on which switching-on or switching-off light bulges, which typically occur during switching operations, are guided. In addition to the arcing contact pieces, it is also possible to provide rated current contact pieces, so that the functionality of current carrying and arc guiding is divided between the rated current contact pieces and the arcing contact pieces. Between the arcing contact pieces a switching path is formed, within which a switch-off or Einschaltlichtbogen is performed. The switching path is used to bring about a galvanic contacting of the arcing contact pieces or a separation of the arcing contact pieces. The arcing contact pieces are designed to be movable relative to each other. The switching gas channel opens doing in the switching path, so that in the switching path resulting switching gas can be removed from the switching path. In the absence of such a switching gas channel, an undesired pressure increase could occur when generating switching gas in the switching path, which could ultimately lead to destruction of the circuit breaker interrupter unit. Switching gas can be generated, for example, due to the thermal effect of an arc of an insulating fluid. Furthermore, the switching gas can also be generated by evaporation of solids such as insulating materials or conductor materials. The switching gas is usually excessive in its temperature and undergoes an increase in volume due to the temperature increase.

In the switching path, for example, an electrically insulating fluid is located, which flows through the switching path and surrounds the electrically active parts of the interrupter unit. The electrically insulating fluid serves to electrically isolate the active parts and flows through the circuit breaker breaker unit. Such a fluid has the advantage that after the occurrence of an arc, an arc channel is automatically filled again with uncontaminated electrically insulating fluid. One speaks of a so-called self-healing electrical isolation. As an electrically insulating fluid, for example, electrically insulating gases or electrically insulating liquids such as oils, esters, etc. can be used. Suitable electrically insulating gases have proven to be sulfur hexafluoride, nitrogen and mixtures with these gases. Advantageously, the electrically insulating fluid should flow around the circuit breaker interrupter unit under an overpressure. The overpressure increases the electrical insulation strength of the fluid.

The switching gas channel opens into the switching path and connects the switching path with a Schaltgasausströmöffnung, which is located in the periphery of the circuit breaker breaker unit. This can be located in the switching path under pressurized switching gas are passed through the switching gas channel through the interrupter unit through a defined way up to a Schaltgasausströmöffnung to flow there into the environment of the circuit breaker breaker unit. The environment of the circuit breaker breaker unit is filled, for example, with a fluid, with which the flowing out of the Schaltgasausströmöffnung switching gas can be swirled and mixed. This fluid may be identical to and in communication with the fluid within the circuit breaker unit. The switching gas channel can be guided inside the circuit breaker interrupter unit, for example, within an overlapping section, which is formed by overlapping two pipe sections. The overlapping portion extends in an axial direction. In this case, a first pipe section has a smaller cross section than a second pipe section, so that the outer shell side on the inner first pipe section and inner shell side on the outer second pipe section, an annular portion of the switching gas channel is limited, which can serve to guide and directing switching gas. Thus, the switching gas channel in the overlapping region of the pipe sections on an annular cross-section. Advantageously, the pipe sections should each have similar cross sections, so that an annular cross section is formed with parallel body edges. Preferably, the pipe sections should each have annular cross-sections, so that the limited in the overlap region portion of the switching gas channel has a circular cross-section. The pipe sections should have similar cross-sections in the region of their overlap. By an arrangement of relief opening in the lateral surfaces of the pipe sections, the possibility is given to allow in addition to an axial guiding of switching gas within the pipe sections and a radial outflow of the switching gas through the walls of the pipe sections therethrough. An axial offset of the discharge openings in the first and in the second pipe section to each other, allows a radial escape of switching gas through the discharge openings, wherein a direct escape of switching gas from a discharge opening of a pipe section is prevented in a discharge opening of the other pipe section. This ensures that a discharge opening, which is freely continuous, is covered by a wall of the other pipe section. It is further ensured that the switching gas is deflected radially before flowing into a discharge opening, or that the switching gas is deflected axially after emerging from a discharge opening.
In a projection in the direction of a direction of passage of a discharge opening so a cover is always given by a wall of the other pipe section. Thus, in the direction of passage in front of / behind each freely continuous discharge opening, a baffle surface is provided. Thus, an effective swirling and mixing of the switching gas is ensured with located within the switching gas channel insulating fluid. An axial offset can be designed such that over almost the entire length of the pipe sections each discharge openings are arranged, wherein an axial displacement is enforced by a demand-based closing of individual discharge openings. In addition, it can also be provided that a group of relief openings in the first or in the second pipe section is arranged axially spaced from a group of relief openings in the second or in the first pipe section.

By an axial offset, a flow of switching gas in radial directions is made possible, so that increased quantities of gas can be passed through the Schaltgaskanal through within short time intervals, despite a turbulence and deflection of the switching gas, the flow resistance undergoes only a limited flow resistance increase. It can be provided that the freely continuous discharge openings are in the axial sequence several times alternately in the first and in the second pipe section. It can also be provided that at the pipe sections only at an end face of the overlapping section the one pipe section has freely continuous discharge openings, whereas the other pipe section at the other front end of the overlap region has freely continuous discharge openings. Groups of free-passage discharge openings in the first or in the second pipe section can be located at each of the front ends.

A further advantageous embodiment can provide that with respect to the axial direction within the overlapping section on an azimuthal path only one of the pipe sections has freely continuous discharge openings.

By the definition of one or more azimuthal webs with respect to the axial direction, to which, for example, hollow cylindrical shaped pipe sections can be arranged coaxially and permitting continuous discharge openings only at one of the two pipe sections, the assurance is given that radially aligned relief openings in the Both pipe sections are prevented. In order for a baffle over / in front of a respective continuous discharge opening is provided at which from a discharge opening leaking switching gas is deflected or an inflow of switching gas takes place in a discharge opening with change of the flow direction. Thus, an effective swirling and cooling of the switching gas is possible. Furthermore, there is the possibility of allowing a plurality of relief openings on the azimuthal path within a tubular body and thus to enable a redirecting of switching gas in many radial directions on the azimuthal path. Thus, a large overall cross-section can be provided by a plurality of relief openings to allow large volumes of switching gas to flow through the switching gas channel and thereby to effect a favorable cooling. For example, it may be provided that a plurality of azimuthal webs are arranged in the two mutually encompassing pipe sections, which are a radial Allow outgassing of switching gas. These azimuthal webs can be arranged alternately offset in axial direction in the first or the second pipe section. However, it can also be provided that groups of discharge openings in the first and in the second pipe section are arranged axially offset from one another, so that a deflection of the switching gas is forced in the radial direction on the first pipe section and then takes place a further steering of the switching gas in the axial direction, to then then again in the radial direction to be able to flow through the discharge opening of the second pipe section.

In addition to the use of two mutually encompassing pipe sections which define a switching gas duct on the shell side within an overlapping section, it is also possible to use a further number of overlapping pipe sections, so that a plurality of shell-like successive sections of the switching gas duct are present, which are in the same axially extending overlapping area follow each other radially. Correspondingly, when more than two pipe sections are used, the axial offset of freely interspersed relief openings may relate to the pipe sections immediately adjacent to one another, which together delimit a section of a switching gas channel. Further pipe sections which are not immediately adjacent may optionally have a relief opening arranged in alignment on the same azimuthal path, wherein a baffle wall is formed by an interposed pipe section, which may be arranged directly adjacent to the other two pipe sections.

A further advantageous embodiment can provide that at least one of the pipe sections, in particular a plurality of relief openings are closed by a valve body.

By using a fitting body, it is possible to close discharge openings in at least one of the pipe sections. For example, it may be provided that a different number of discharge openings should be effective depending on the expected switching gas volumes or the cooling capacity to be achieved. By using valve bodies, it is possible to restrict the free passage of discharge ports and to operate only a limited number of discharge ports in the circuit breaker breaker unit. By adapting the fitting body, it is possible to vary their cooling capacity by changing cover or by a variable covering of relief openings at constant pipe sections. Furthermore, by covering discharge openings, the flow pattern of switching gas within the switching gas channel can be controlled. As a fitting body, for example, annular body can be used, which on / or. be pushed into the pipe sections, so that at least one or in particular both pipe sections are partially covered by one or more annular bodies. In this case, the cross section of the tubular body is to be selected as complementary as possible to the respective pipe section. Thus, a fitting body, for example, outer shell side sit on a pipe section. However, it can also be provided that a valve body is inserted on the inner shell side into a tubular body. Due to the shape complementarity is a flush concern the fitting body given to the respective pipe section, so that the most possible sealing completion and closure of relief openings. By varying the dimension of the fitting body, the number of sealed relief openings can be varied. Furthermore, the position of the fitting body can vary relative to the tubular body. Furthermore, it can be provided that at least one fitting body serves to hold or position a pipe section on the circuit breaker breaker unit.

Furthermore, it can be advantageously provided that the pipe sections are each encompassed by a fitting body end and the fitting body protrude from opposite directions in the overlapping portion such that the valve bodies end at a common circumferential around the axial direction of the web.

The fitting body can be arranged, for example at the two pipe sections each end, the fitting body can serve to hold and positioning the pipe sections. Thus, it is possible to align the two pipe sections, for example by means of the fitting body coaxial with each other and set the course of the switching gas channel. If the pipe sections are each equipped at the end with fitting bodies, the fitting bodies being respectively arranged at opposite ends with respect to the axial direction of the pipe bodies, then it is possible to arrange a region of the fitting bodies closing off discharge openings from opposite ends into one between the ends of the pipe bodies. run in the central region of the overlap section. Thus, in each case opposite ends aligned, namely each end sides of the pipe sections spanned or covered by the valve body, so that only the not facing away from the valve body sections of the tubular body with the discharge openings located there can serve a radial passage of switching gas. The circulating track can be self-contained around the axial direction and have different shapes. For example, the web may have a circular shape, an elliptical shape, a corrugated shape, a sawtooth shape, etc. The faucets collide from opposite directions in a complementary shape against this path and end at her. For example, the web can circulate azimuthally. Due to the spacing of the tubular body to each other, a juxtaposition of the web is only transverse in one projection, in particular determine radially to the axial direction. The web thus represents a virtual complementary shape shock edge. Schaltgas can so in the area of the circulating path over a short distance from a discharge opening of a pipe section in a discharge opening of the other pipe section, wherein the switching gas flow is impressed at a crossing an axial flow direction. Thus, in a juxtaposition on a path given the opportunity to lead the switching gas, for example, first within the first pipe section centric, since the switching gas due to the covering of the relief openings by means of a fitting body initially can not be redirected in radial directions and only at the following section can flow in the radial direction. A further radial flow of the switching gas is prevented by the second pipe section or by the fitting body, which covers discharge openings located in the second pipe section. Thus, an axial flow is first forced again. Accordingly, after passing through the cover of the second fitting body, in turn, a radial deflection can be provided through relief openings within the second tubular body. Thus, a deflection of the switching gas can be forced by 180 °, wherein the switching gas channel has a meandering course.

By using fitting bodies, it is possible, for example, to partially cover discharge openings having tubular body by means of the fitting body, wherein the fitting body each span only a portion of the entire overlap portion of the two pipe sections in the axial direction.

A further advantageous embodiment can provide that at least one of the pipe sections has a perforated plate with relief openings located symmetrically in the pipe section.

The use of perforated plates makes it possible to form tubular body standardized and in the lateral surface as symmetrical as possible distributing a variety of relief openings make. For example, relief openings can pattern the perforated plate in a lattice-like manner, so that a large number of intersecting webs arise between the discharge openings, which ensure torsional stiffness of the tubular body. For example, the relief openings may each be arranged symmetrically distributed on azimuthal paths, wherein the discharge openings are aligned linearly aligned in the axial direction. In this case, the webs cross at right angles. However, it can also be provided that the distribution of relief openings on immediately adjacent azimuthal paths is offset relative to one another. In this case, the webs do not cross at right angles. A tubular body can be formed, for example, by rolling, bending, etc. of a perforated sheet metal plate.

A further advantageous embodiment can provide that the circuit breaker interrupter unit is surrounded by an encapsulating housing.

The arrangement of a circuit breaker interrupter unit within an encapsulating housing makes it possible to design the encapsulating housing in a fluid-tight manner, so that an electrically insulating fluid flushing through the circuit breaker unit is encapsulated and sporadic volatilization of this electrically insulating fluid is largely suppressed. The encapsulating housing thus constitutes a barrier to the electrically insulating fluid and can also be designed as a pressure-resistant encapsulating housing, so that an electrically insulating fluid enclosed in the interior of the encapsulating housing can also be acted upon with an increased pressure relative to the surroundings of the encapsulating housing. The encapsulating housing surrounds the circuit breaker interrupter unit, the interior of the encapsulating housing defining the surroundings of the circuit breaker interrupter unit. The switching gas channel, which connects the switching path to an environment of the circuit breaker unit, thus provides a compound of Switching path via the switching gas channel and the Schaltgasausströmöffnung with the interior of the hermetically sealed Kapselungsgehäuse is thus given a way to flow from the interior of the circuit breaker breaker unit switching gas relatively quickly into the environment of the circuit breaker breaker unit and pre-cool the switching gas in this way, so that outside the circuit breaker breaker unit within the encapsulating a further swirling, mixing and cooling of the already pre-cooled switching gas can be carried out with the located in the encapsulating housing electrically insulating fluid.

The encapsulating case should be designed in such a way that phase conductors can be inserted electrically insulated through the encapsulating housing into the interior of the same, in order to be contacted with the arcing contact pieces, so that a current path can be interrupted or switched on, the arrangement with the Circuit breaker interrupter unit is located in an electric power transmission network. The circuit breaker breaker unit should be electrically insulated supported on the encapsulating. For this purpose, the encapsulating housing can be embodied, at least in sections, for example, even in an electrically insulating manner. However, it can also be provided that the encapsulating housing is at least partially formed of electrically conductive material preferably earth potential leading, with respect to these electrically conductive sections, the circuit breaker breaker unit should be electrically isolated, for example by means of post insulators.

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 Anordnung mit einer Leistungsschalterunterbrechereinheit, die in einem Kapselungsgehäuse angeordnet ist.

It shows the

figure

a section through an arrangement with a circuit breaker breaker unit, which is arranged in a Kapselungsgehäuse.

The figure shows a partially cutaway arrangement with a circuit breaker breaker unit, which is arranged within a capsule housing 1. In the present case, the encapsulating housing 1 has a metallic cast body which carries ground potential. The interior of the encapsulating housing 1 is filled with an electrically insulating fluid, preferably an electrically insulating gas such as sulfur hexafluoride or nitrogen or a mixture with the gases. The electrically insulating fluid is subjected to overpressure. Due to the hermetically sealed design of the encapsulating housing 1, sporadic volatilization of the electrically insulating fluid under overpressure is only possible with difficulty.

The encapsulating housing 1 extends essentially in a tubular manner coaxially to a longitudinal axis 2, wherein the end faces of the encapsulating housing 1 are closed by hood-shaped closure elements. The longitudinal axis 2 defines an axial direction. Furthermore, the encapsulating housing 1 has connecting flanges, of which an exemplary connecting flange 3 is shown in the figure. By means of the connecting flanges, it is possible to gain access to the interior of the encapsulating housing 1, wherein all connecting flanges are sealed fluid-tight under operating conditions.

In the interior of the encapsulating housing 1 extends substantially coaxially with the longitudinal axis 2, a circuit breaker breaker unit. The circuit breaker breaker unit has a first arcing contact piece 4 and a second arcing contact piece 5. The two arcing contact pieces 4, 5 are formed opposite to each other and displaceable along the longitudinal axis 2, wherein the arcing contact pieces 4, 5 aligned substantially coaxially to the longitudinal axis 2 are. The first arcing contact piece 4 is formed bolt-shaped. The second arcing contact piece 5 is shaped like a bush in opposite directions. The first arcing contact piece 4 is assigned a first rated current contact piece 6. The second arcing contact piece 5 is assigned a second rated current contact piece 7. The two rated current contact pieces 6, 7 are arranged coaxially to the two arcing contact pieces 4, 5 and have shape-complementary contact areas. The first arcing contact piece 4 and the second rated current contact piece 7 and the second arcing contact piece 5 and the second rated current contact piece 7 are permanently contacted with each other electrically conductive, so that the first arcing contact piece 4 and the first rated current contact piece 6 and the second arcing contact piece 5 and the second rated current contact piece 7 permanently the same lead electrical potential.

The two arcing contact piece 4, 5 are arranged displaceable relative to the longitudinal axis 2. For this purpose, it is provided that the first arcing contact piece 4 is equipped with a gear 8, so that the two arcing contact pieces 4, 5 are always movable in the opposite direction. The first rated current contact piece 6 is not displaceably mounted with respect to the longitudinal axis 2. Only the second rated current contact piece 7 is arranged displaceably along the longitudinal axis 2. A relative movement of the arcing contact pieces 4, 5 and the rated current contact pieces 6, 7 to each other is synchronized such that initially contact the arcing contact pieces 4, 5 at a power-up and then the Nennstromkontaktstücke 6, 7 contact each other. In the case of a switch-off operation, a separation of the rated current contact pieces 6, 7 takes place at first, whereas a separation of the arcing contact pieces 4, 5 takes place in chronological succession. Such a synchronization of the movements of arcing contact pieces 4, 5 and rated current contact pieces 6, 7 ensures that an arc is preferably conducted between the arcing contact pieces 4, 5. An arc can be a Einschaltlichtbogen or a Ausschaltlichtbogen, which optionally ignites at a switch-on or a switch-off. In order for the arcing contact pieces 4, 5 protect the rated current contact pieces 6, 7 against erosion by an arc.

Coaxial with the two arcing contact pieces 4, 5, a Isolierstoffdüse 9 is arranged. The insulating material nozzle 9 is connected in a rigid angle with the second arcing contact piece 5 and has an insulating nozzle channel. The Isolierstoffdüsenkanal limited between the arcing contact pieces 4, 5 formed switching path 10. In the off state, as shown in the figure, the first arcing contact piece 4 protrudes at least partially into the Isolierstoffdüsenkanal the Isolierstoffdüse 9 inside. In a switching operation, it is thus preferable to guide an arc limited by the insulating material nozzle 9 in the switching path. Generated by an arc, heated and enlarged in volume switching gas preferably flows from the switching path 10 in the direction of the first arcing contact piece 4. In order to convey an outflow in this direction, the Isolierstoffdüsenkanal the insulating material 9 is funnel-shaped in the direction of the first arcing contact piece 4 expanded.

The first rated current contact piece 6 is supported by a pipe socket 11. The pipe socket 11 surrounds the first arcing contact piece 4. In the pipe socket 11 and the remote from the second arcing contact piece 5 free end of the insulating material 9 protrudes into it. In the switching path 10 opens a switching gas channel, which is continued after the Isolierstoffdüse 9 via the pipe socket 11 in the axial direction. The pipe socket 11 thus forms a coaxial with the longitudinal axis 2 lying portion of the switching gas channel, wherein projecting into this portion of the switching gas channel, the first arcing contact piece 4 and the transmission 8. At the pipe socket 11, a first pipe section 12 connects. The first pipe section 12 is formed as a hollow cylinder, wherein its lateral surfaces are penetrated by discharge openings. The first pipe section 12 and parts of the pipe socket 11 are encompassed by a second pipe section 13. Also, the second pipe section 13 has over its entire length on the shell side discharge openings. Both the first pipe section 12 and the second pipe section 13 are in turn surrounded by a third pipe section 14, wherein the third pipe section 14 serves as a phase conductor for contacting the first arcing contact piece 4 and the first rated current contact piece 6 and both the first arcing contact piece 4 and the first rated current contact piece 6 and enclosed components, such. B. the first and second pipe sections 12, 13, positioned. The third pipe section 14 is supported electrically insulated, for example, via a support insulator 15 on the encapsulating housing 1. Furthermore, the third pipe section 14 on the shell side on a radially outwardly projecting socket 16. By means of this socket 16, the third pipe section 14 can be electrically contacted via a connection phase conductor which is electrically insulated from the exemplary connection flange 3 and inserted into the interior of the encapsulation housing. For this purpose, for example, an electrically insulating and fluid-tight outdoor bushing can be placed on the exemplary connection flange 3. This makes it possible to integrate the circuit breaker interrupter unit under outdoor conditions in an electric power transmission network.

The interior of the third pipe section 14 is divided by the second pipe section 13 and by the first pipe section 12 into a plurality of hollow cylindrical sub-volumes that encompass each other. Between the first pipe section 12 and the second pipe section 13, a first hollow cylindrical partial volume 17 is arranged. Between the second pipe section 13 and the third pipe section 14, a second hollow cylindrical partial volume 18 is arranged. The two hollow cylindrical sub-volumes 17, 18 surround a centrally positioned, surrounded by the first pipe section 12 central cylinder volume 19th

The switching path 10 facing the end of the first pipe section 12 is frontally connected flush with the pipe socket 11. The end remote from the switching path 10 end of the first pipe section 12 is closed by a closure element 20 frontally. The closure element 20 serves as a deflecting body in order to redirect switching gas flowing into the switching gas channel in the axial direction along the longitudinal axis 2 from the switching path 10 into radial directions. At its end of the switching path 10 end of the first pipe section 12 is encompassed by a fitting body 21. The fitting body 21 serves to connect the first pipe section 12 to the pipe socket 11 and surrounds the pipe body to the outer shell side. The fitting body 21 is pushed onto the outer contour of the first pipe section 12 in such a hollow cylindrical manner that nearly half of the first pipe section 12 spans the fitting body 21 and relief openings lying in this section are closed by the fitting body 21. The fitting body 21 terminates at an azimuthal path 22. The region of the first pipe section 12, which is not spanned by the valve body 21, has at its end remote from the switching path 10 freely continuous discharge openings, which allow a radial deflection of switching gas.

The second pipe section 13 is also held by a fitting body 23. The fitting body 23 is arranged at the end remote from the switching path 10 end of the second pipe section 13 and surrounds the second pipe section 13 outer jacket side, wherein the fitting body 23 extending in the direction of the contact gap 10, outer shell side flush against the second pipe section 13 and there located relief openings closes. The fitting body 23 extends in the direction of the switching path 10, up to the azimuthal path 22, at which the fitting body 21, which surrounds the first pipe section 12 ends. Thus, the free ends of the fitting body 21, 23, which respectively in the direction of a center of the overlapping portion the two tubular bodies 12, 13 protrude, ending on a vertical plane, abutting the azimuthal web 22. Thus, the discharge openings, which are arranged freely continuously on the first pipe section 12, spanned on the outside by a baffle, whereas the shell-side discharge openings located in the second pipe section 13 are in turn spanned in the radial direction on the inside by a baffle wall. This ensures that radial discharge openings, which are arranged in the first or in the second pipe section 12, 13, in the respective pipe section 12, 13 are arranged offset in the axial direction to each other.

In the present case, a plurality of groups of relief openings are formed in the first and second pipe sections 12, 13, wherein each individual relief opening of the respective group is offset axially relative to each individual relief opening of the respective other group with respect to the longitudinal axis 2. The relief openings themselves can be arranged in a plurality of radial directions in the lateral surface of the respective pipe section 12, 13.

The overlapping section between the first pipe section 12 and the second pipe section 13 is closed at the end, so that an entry or exit of switching gas in the section of the switching gas channel, which is formed in the overlapping section with annular cross section between the two pipe sections 12, 13 exclusively from the radial directions in the same inflow or in the radial directions can flow out of the same. An inflow and outflow into the section of the switching gas channel with annular cross sections takes place in radial directions. Thus, a deflection of the switching gas is forced at least once by 180 °, wherein in the interest of a large gas throughput abutting the axial offset of relief openings as possible limited to an azimuthal path 22, being on both sides of this azimuthal path 22 in the axial Direction the staggered free discharge openings extend.

After an exit of the switching gas through the discharge openings of the second pipe section 13 in radial directions, the switching gas radiates against the third pipe section 14, which in the present case has no outflow openings in the radial direction. Instead, an arrangement of a plurality of Schaltgasausströmöffnungen 24 is frontally provided at the end remote from the switching path 10 end, which allows leakage of switching gas from the circuit breaker breaker unit into the environment of the circuit breaker breaker unit. However, it can also be provided that radially oriented switching gas outflow openings are arranged in the third pipe section 14.

Thus, via the switching gas channel, which opens on the one hand in the switching path 10, via the discharge openings in the two pipe sections 12, 13, and the pipe sections 12, 13 even to the Schaltgasausströmöffnungen 24 is a direct path from the switching path to the environment of the circuit breaker breaker unit, d. h., Given to the capsule housing 1 encapsulated volume. Thus, relieving overpressures, which may occur during a switching operation in the switching path, take place in the vicinity of the circuit breaker interrupter unit, so that an irreversible influence on the circuit breaker interrupter unit is prevented.

Claims (5)

1. Arrangement comprising a circuit breaker interrupter unit having a breaker gap (10) arranged between a first and a second arcing contact piece (4, 5) and having a switching gas channel, which leads on the one hand to the breaker gap (10) and on the other hand to a switching gas outlet opening (24) of the circuit breaker interrupter unit and which is delimited, at least in portions, by a first and a second pipe portion (12, 13), which overlap one another in the axial direction (2) in an overlap portion and each have discharge openings in their lateral surfaces, wherein unobstructed discharge openings in the first and in the second pipe portion (12, 13) are offset axially in relation to one another,
   characterized in that
   one discharge opening, in particular a plurality of discharge openings, is/are closed at least in one of the pipe portions (12, 13) by a fitting body (21, 23).
2. Arrangement according to Claim 1,
   characterized in that,
   only one of the pipe portions (12, 13) has unobstructed discharge openings within the overlap portion over an azimuthal path (22), with respect to the axial direction.
3. Arrangement according to one of Claims 1 and 2,
   characterized in that
   the pipe portions (12, 13) are encompassed in each case at the end face by a fitting body (21, 23), and the fitting bodies (21, 23) protrude from opposite directions into the overlap portion in such a way that the fitting bodies (21, 23) end at a common path (22) running around the axial direction.
4. Arrangement according to one of Claims 1 to 3,
   characterized in that
   at least one of the pipe portions (12, 13) comprises a perforated plate with discharge openings arranged symmetrically in the pipe portion (12, 13).
5. Arrangement according to one of Claims 1 to 4,
   characterized in that
   the circuit breaker interrupter unit is surrounded by an encapsulating housing (1).

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