EP2390890A1 - Switching chamber isolation assembly for a circuit breaker - Google Patents

Abstract

The arrangement has a bar assembly (100) provided with a set of bars (10-40), where each bar includes base areas (11, 13, 21, 23) and central areas (12, 22) lying between the base areas. The bars are arranged around a longitudinal extending axis (L) of the bar assembly along a periphery (U). The bar assembly includes two mechanical coupling regions (101, 103) present on a side of the respective base areas for coupling to respective switch contact poles of a circuit-breaker. Each bar exhibits an elongated cross-section within the central areas. An independent claim is also included for a circuit-breaker comprising a field control cover connected with a switch contact pole.

Description

Field of the invention

The present invention relates to a switching chamber isolation device, and more particularly to a switching chamber isolation device for a circuit breaker having improved heat dissipation capability.

Background of the invention

Circuit breakers for switching high voltages or high currents usually have elaborately designed contact poles, which can be moved relative to each other to make an on or off. Due to the high voltages or currents occurring, it is generally necessary to position the two switch contact poles in a defined manner relative to one another so that the corresponding contact surface can be contacted or disconnected in a predetermined manner. In order to ensure proper positioning of the two switch contact poles, a switching chamber insulation arrangement is provided which positions the two switching contact poles in such a way that a geometrically predetermined opening and closing of the contact surfaces of the switch contact poles is ensured to one another. However, such a switching chamber insulation arrangement must not only ensure a mechanical stabilization of the two switch contacts to each other, but also have a dielectric strength, which withstands the occurring voltages, in particular in the opened state of the switch contacts. For this purpose, hitherto substantially closed pipe arrangements have been used, on which the two switch contact poles are fixed, so that moving parts of the switch contact poles can move toward one another in a defined manner. However, such pipe arrangements have a spatial foreclosure of the contact surfaces of the Switch contact poles result, so that an occurring heat generation can not be reliably dissipated at the contacts of the switch contact poles in certain operating conditions.

Summary of the invention

In view of the above-mentioned problems, it may be considered to provide a switching chamber isolation device with a switching chamber isolation arrangement that enables improved heat dissipation in the area of the switch contact poles.

The object of the present invention is achieved by a switching chamber insulation arrangement or a circuit breaker according to the subject of the independent claims, wherein exemplary embodiments are embodied in the dependent claims.

According to an exemplary embodiment of the invention, there is provided a switching chamber isolation assembly comprising a strut assembly having a plurality of struts, each strut having a first leg region, a second foot region, and a midregion located between the first root region and the second root region, the struts being about a longitudinal axis of extension Struts arrangement along a circumference are arranged, wherein the strut arrangement has a first mechanical coupling portion on the side of the first foot portions for coupling to a first pole of a circuit breaker and a second mechanical coupling portion on the side of the second foot portions for coupling to a second pole of a circuit breaker. The term 'first pole' or 'first contact pole' and 'second pole' or 'second contact pole' of a circuit breaker in the following description does not mean two poles of different electrical phases, but rather a first contact part and a second contact part of a single circuit breaker, wherein the first contact part and the second contact part are electrically separable from each other.

Due to the strut arrangement, the region of the contacting of the two switch contacts is no longer spatially sealed off from the remaining volume of the switch, but communicates with the remaining volume of the switch. In particular, it is possible for gas-insulated circuit breakers that a gas exchange takes place in the region of the switch contact poles with the remaining gas volume, whereby improved heat dissipation in the region of the contact points of the switch contact poles can be achieved. Nevertheless, the strut arrangement allows sufficient positioning and force absorption, so that a reliable opening and closing of the contact of the switch contact poles is ensured. In this case, a corresponding mechanical coupling to corresponding regions of the switch contact poles can be achieved via the mechanical coupling regions of the strut arrangement.

According to an exemplary embodiment of the invention, the struts have an elongate cross-section in the middle region.

An elongated cross-section is understood to be an elongation substantially orthogonal in the direction of a circumference, ie, azimuthal to a longitudinal axis of the struts or the strut arrangement. Elongated may be, inter alia, but not exclusively, oval, elliptical or kidney-shaped. By an elongated cross-section can be achieved that the struts have a sufficient bending moment, but only small dimensions in a radial direction with respect to the longitudinal axis of the strut arrangement have, so that ensures both a sufficient distance to the live parts of the switch contact poles and to an outer housing can be, and at the same time the radial dimensions can be kept low.

In the case of an embodiment as outdoor switch (AIS), the outer housing is formed as an insulator. In the case of embodiments as a gas-insulated switchgear (GIS) or as a tank switch (DTB), the outer housing is metallic or at least metal-encapsulated.

According to an exemplary embodiment of the invention, the respective first foot regions or the respective second foot regions are offset from the corresponding central regions in a radial direction of the switching chamber insulation arrangement by a distance with respect to the longitudinal extension axis.

Cranked means that the two central axes, d. H. the central axes of the foot areas and the central axes of the central areas are shifted from each other. In particular, the center regions can be located radially further outside than the foot regions. In this way it can be achieved that the foot portions can be attached closer to the switch contact poles, but a sufficient dielectric distance between the contact surfaces or live parts of the switch contact poles is ensured to the central regions. This is particularly relevant if the foot areas of the switching chamber insulation arrangement are covered by field-controlling elements. Thus, a compact design of a circuit breaker with a corresponding switching chamber isolation arrangement can be ensured.

According to an exemplary embodiment of the invention, in the strut arrangement, the first foot region of a respective strut is shifted relative to the associated second foot region in this strut along the circumference, so that the struts are inclined with respect to the longitudinal extension axis.

In particular, the struts can be shaped similarly to a helix section in order to ensure the sufficient distance to the switch poles. In this way, the effective length of the strut lengthens with the same distance the two fastening planes, which extend orthogonally with respect to the longitudinal extension direction of the switching chamber insulation arrangement and in which in each case the first and the second foot areas can lie. In this way, an elongated creepage path along the surface of the respective strut results, so that such a strut arrangement has a higher surface discharge resistance compared to a strut arrangement with struts which extend parallel to a longitudinal extension direction.

According to an exemplary embodiment of the invention, the strut arrangement thereby has at least three struts.

In this way, a stable positioning of the two switch contact poles to each other can be realized, in particular if the at least three struts have a substantially equal distance from each other. In particular, bends along the longitudinal axis can be substantially prevented. If, in this case, the struts are inclined with respect to the longitudinal axis of extension, this inclination can run in the same direction in all struts, so that a symmetrical helical strut profile can be achieved.

According to an exemplary embodiment of the invention, the strut assembly at least four struts, wherein the struts are alternately inclined in opposite directions to the longitudinal direction, such that a stiffening results in the circumferential direction about the longitudinal axis.

In this way, a tordierende displacement of the two switch contact poles to each other can be avoided, this torsion is achieved essentially by the alternately oppositely inclined struts. The degree of inclination depends on the degree of required connection stiffness. A bending and thus geometric deformation of the struts, in particular in Longitudinal direction occurring forces, such as when opening or closing, can be avoided.

According to an exemplary embodiment of the invention, in each case a field control electrode is embedded in the first foot regions or the second foot regions, wherein a force receiving device is arranged within the field control electrode.

Such a force-absorbing device may for example be a thread or a bolt, but also a bayonet connection or a clamping connection. In this case, the field control electrode can bring about a field-optimized geometry so that the field elevations can be kept substantially below a critical range. In particular, in the foot areas a field-optimized regarding the outer contour metal part may be provided in the interior, for example, the force receiving device is in the form of a thread or other attachment, so that the force receiving device and the field control electrode are integrally formed.

The elements of the field control electrode can be made of metal as well as of another potential-carrying material, such as a plastic, the potential-carrying additive, such as carbon or graphite is mixed.

According to an exemplary embodiment of the invention, the first foot portions of the struts are each formed integrally with a first carrier ring and the second foot portions are each formed integrally with a second carrier ring.

In this case, the carrier rings can extend along a circumference, which essentially corresponds to the outer dimensions of the switch contact poles. In this way, a substantially integral switching chamber isolation arrangement may be provided can be easily attached to the corresponding switch contact poles, without having to make a separate alignment of the individual struts to each other. At the same time, however, a corresponding heat dissipation or a gas exchange in a gas-insulated circuit breaker is maintained by the strut arrangement. The cranking can take place both in the region of the struts, ie between the foot region and middle part, as well as in the region of the carrier rings.

According to an exemplary embodiment of the invention, the strut arrangement comprises a polymer resin and has a metal-oxide-filled polymer resin in at least one section of an electrical insulating section.

Polymer resins ensure reliable dielectric strength and, at the same time, mechanical stability. A corresponding metal oxide filling can bring about an increase in the mechanical stability, as well as represent an improved thermal property. As the polymer resins, for example, but not limited to, an epoxy resin, a polyurethane resin or a phenol resin may be used. So metal oxide can be used for example alumina Al2O3. In addition, titanium dioxide or magnesium oxide can also be used. A suitable combination may consist, for example, of an aluminum oxide-filled epoxy resin, with aluminum oxide having a certain resistance to SF6 and SF4, which occur in particular in gas-insulated circuit breakers. The strut assembly may have a homogeneous structure, for example, be a homogeneous potting compound, or machined from a homogeneous material. In particular, it is possible to dispense with longitudinal structures such as fiber inserts, in particular if they allow a discharge or partial discharge problem to be expected.

According to an exemplary embodiment of the invention, the middle region of at least one strut has a shell which is radially outer with respect to the respective strut and a filling which is radially inward with respect to the respective strut.

In this case, the outer shell may completely comprise the respective strut on the outside or may also be designed only as a half shell. A shell can absorb corresponding tensile forces, in particular when using corresponding tensile-stable materials, while an internal filling can absorb compressive forces. Furthermore, a shell can also provide mechanical protection for the internal filling. In this way, a particularly tensile and compressive force becomes stable, i. also provides a flexible strut arrangement for a switching chamber isolation arrangement.

According to an exemplary embodiment of the invention, the circumference is circular and / or the switching chamber insulation arrangement can be installed in a single-phase encapsulated circuit breaker.

A circular circumference allows a simplified assembly of the switching chamber insulation arrangement or the circuit breaker, since a corresponding radial alignment does not have to be considered.

According to an exemplary embodiment of the invention, at least part of the strut arrangement is coated, in particular with a diffusion barrier.

Such a diffusion barrier may be, for example, a titanium dioxide coating or an epoxy coating. In this way it can be prevented, in particular, that aggressive decomposition products that can occur in a gas-insulated circuit breaker due to the action of arcing attack or even destroy the structure of the strut arrangement or the switching chamber insulation arrangement.

However, instead of a homogeneous material structure, the middle part of the strut may also have a supporting and stabilizing core insert, such as a composite tube, a composite strip or a rod, whereby the filling or strut can be cast around the corresponding tube, strip or rod. In particular, the middle part of the strut may also have a fiber reinforcement insert, in particular the form that no discharge or partial discharge operations are to be feared.

According to an exemplary embodiment of the invention, a circuit breaker is provided with a switching chamber isolation arrangement according to the invention, a first switch contact pole and a second switch contact pole, wherein the circuit breaker is a single-phase encapsulated power switch. The switching chamber insulation arrangement and the first and second switch contact pole are connected to one another in such a way that the first or second switch contact pole are aligned and defined in a defined manner with respect to one another.

According to an exemplary embodiment of the invention, the power switch comprises a first field control cover disposed at a nominal contact, the first field cover being connected to the first switch contact pole and / or the second switch contact potential, and wherein the first mechanical coupling region is at the first switch contact pole or the second switch contact pole under the first field control cover is mechanically connected to the first switch contact pole.

In this way, the critical with respect to an electric field fasteners can be covered by a field control cover such that essentially no critical field peaks are to be expected.

It should be noted that the embodiments of the invention described below relate equally to the switching chamber isolation arrangement as well as the power switch. Of course, the individual features can also be combined with each other, which can also be partially beneficial effects that go beyond the sum of the individual effects. These and other aspects of the present invention are illustrated and clarified by reference to the exemplary embodiments described hereinafter.

Brief description of the drawings

Figur 1

zeigt eine Schaltkammerisolationsanordnung mit einer Strebenanordnung gemäß einer beispielhaften Ausführungsform der Erfindung.

Figur 2

zeigt eine detaillierte Ansicht eines Mittelteils und eines Fußbereiches einer Strebe mit entsprechenden Querschnittansichten gemäß einer beispielhaften Ausführungsform der Erfindung.

Figuren 3 bis 9

zeigen unterschiedliche Ausgestaltungen einer Schaltkammerisolationsanordnung beziehungsweise einer Strebenanordnung gemäß unterschiedlicher Ausführungsformen der vorliegenden Erfindung.

Figur 10

zeigt eine detaillierte Ansicht eines Fußbereiches und eines Mittelbereiches einer Strebenanordnung mit eingelegten Elementen gemäß einer beispielhaften Ausführungsform der Erfindung.

Figur 11

zeigt eine Schaltkammerisolationsanordnung mit Trägerringen gemäß einer beispielhaften Ausführungsform der Erfindung.

Figur 12

zeigt eine Schnittansicht durch einen Teil eines gasisolierten Leistungsschalters mit einer Schaltkammerisolationsanordnung gemäß einer beispielhaften Ausführungsform der Erfindung.

Figuren 13 und 14

zeigen eine Schnittansicht, der in Figur 12 gezeigten Schnittachse gemäß unterschiedlichen Ausführungsformen der Erfindung

Exemplary embodiments will be described below with reference to the following drawings.

FIG. 1

shows a switching chamber insulation assembly with a strut assembly according to an exemplary embodiment of the invention.

FIG. 2

shows a detailed view of a central portion and a foot portion of a strut with corresponding cross-sectional views according to an exemplary embodiment of the invention.

FIGS. 3 to 9

show different embodiments of a switching chamber isolation arrangement or a strut assembly according to different embodiments of the present invention.

FIG. 10

shows a detailed view of a foot region and a central region of a strut assembly with inlaid Elements according to an exemplary embodiment of the invention.

FIG. 11

shows a switching chamber isolation assembly with carrier rings according to an exemplary embodiment of the invention.

FIG. 12

shows a sectional view through a portion of a gas-insulated circuit breaker with a switching chamber isolation arrangement according to an exemplary embodiment of the invention.

FIGS. 13 and 14

show a sectional view, which in FIG. 12 shown section axis according to different embodiments of the invention

Detailed description of exemplary embodiments

FIG. 1 shows a switching chamber insulation assembly with a strut assembly 100, which consists in the embodiment shown here of four struts 10, 20, 30, 40, in longitudinal section. In the embodiment shown here, each of the struts has a central region 12, 22 and corresponding first foot regions 11, 21 as well as second foot regions 13, 23 FIG. 1 Switching chamber insulation arrangement 100 shown here has a first coupling region 101 and a second coupling region 103. The struts are arranged substantially parallel to a longitudinal axis L, wherein the individual struts or their bases are arranged along a circumference U. The distance of the struts along the circumference is uniform in the embodiment shown here, but may also be uneven as needed. In the FIG. 1 shown switching chamber isolation assembly comprises struts with a crank, with reference to FIG. 2 will be described below.

FIG. 2 shows a detailed view of a foot portion 11 of a strut 10 and a central region 12 of a strut. The central axis M _{F of} the foot region 11 is shifted relative to the central axis M _{M of} the central region 12 by a distance d, wherein in the embodiment shown here the two central axes M _F and M _M run parallel.

In the cross sections drawn with I-I and II-II it is visible that, for example, in a foot region 11, an example circular cross-section can be selected, while in an intermediate region 12 an elongated, for example an oval or kidney-shaped cross section can be selected. The round cross-section is favorable for attachment, while the elongated cross-section in the central region allows a space-optimized strut arrangement in this central region.

FIG. 3 shows a strut assembly with three struts 10, 20, 30, which are arranged uniformly along a circumference U in this embodiment. In the FIG. 3 struts shown here are similar, as in FIG. 1 , cranked, such that a central region of the struts is located radially farther outside than a corresponding base region.

FIG. 4 shows an analogous arrangement with three struts 10, 20, 30, which are also regularly arranged along a circumference U, but the struts are provided without cranking, which of course simplifies the production of the struts as such. Such an arrangement can be used in particular when it does not depend on a space-saving arrangement. It should be understood that the struts may be circular cylindrical, but may also have a cylindrical shape with an elongated cross-section or a circular-cylindrical foot region and an elongated central region.

FIG. 5 also shows a strut assembly with three struts 10, 20, 30, wherein, however, the corresponding foot portions 11, 21 relative to the associated foot portions 13, 23 are displaced along the circumference. This causes the Struts 10, 20, 30 obliquely or inclined with respect to the longitudinal axis L extend. In this way, the creepage path is extended along the surface of the struts, wherein the distance between the two planes in which the base points 11, 21 and 13, 23 open substantially have an unchanged distance. Of course, the in FIG. 5 struts shown also be executed cranked.

FIG. 6 shows an arrangement with four struts of a strut assembly, wherein the four struts 10, 20, 30, 40 are also arranged uniformly along a circumference U. This allows a higher stability and also a certain redundancy in a butt break, without losing a three-point hitch.

FIG. 7 shows an analog arrangement with four struts, the analog FIG. 5 to each other twisted foot points 11, 21 on the one hand and 13, 23 on the other. In this way, the struts 10, 20, 30, 40 are inclined relative to the longitudinal axis U.

FIG. 8 also shows a strut assembly with four struts 10, 20, 30, 40, but the respective struts are alternately mutually inclined so that the foot points 11, 21 and 13, 23 are no longer uniformly distributed along the circumference. In this way, however, arises a relatively torsionally stable strut arrangement, since the struts are loaded alternately to train and pressure at a torsional load.

FIG. 9 shows an arrangement with a total of five struts 10, 20, 30, 40, 50, wherein in the in FIG. 9 As shown, the foot points are in turn distributed uniformly along the circumference U. In this way, for example, the struts can be made thinner, and a redundant system can be provided with respect to a fracture fracture. It should be understood that, of course, more than five struts can be used.

FIG. 10 shows a detailed view of a foot portion of a strut 10, wherein the foot portion 11 is offset from the central region 12. In the foot area 11, there is a field control arrangement 14 in the form of an outer surface with low surface curvature and without sharp edges. Within this arrangement, a mechanical fastening 15 is provided, which represents a cut thread in the arrangement shown here. Of course, the mechanical fastening can also consist of a bayonet closure or a clamping connection, as well as a bolt that projects axially out of the strut base area. Such an arrangement with a mechanical attachment 15 and a field control surface 14 may for example be designed in one piece. This can be done for example by a metal part, but also by a plastic part, which is provided with a conductive additive, so that certain field control properties can be obtained. The central region 12 can also be provided with a mechanical reinforcement 99, which can be, for example, a fiber reinforcement insert or a composite material tube or a strut or the like. It should be understood that in a strut not necessarily the reinforcement 99 and the field control assembly 14 must be provided simultaneously, but also only one of the two arrangements can be provided. In addition, it should be understood that the field control device 14 or the reinforcement assembly 99 can also be used with non-cranked struts. The reinforcement assembly may also be connected to the field control assemblies on either side of the strut to ensure positioning of the foot portions, for example, before and during a potting process. The strut may additionally be provided with a coating 98 which, for example, represents a diffusion barrier. The coating can cover both the surface of the strut entirely, as well as be provided only in areas of the struts or the strut assembly.

FIG. 11 shows an exemplary embodiment of a switching chamber isolation arrangement, in which the struts each integral with a first Carrier ring 60 and a second carrier ring 70 are configured. The coupling region 101 can be designed in the region of the first carrier ring 60, while the second coupling region 103 can be configured in the region of the second carrier ring 70. The foot portions 11, 21 and 13, 23 of the struts may terminate in the corresponding support ring 60, 70 and be formed integrally with the corresponding central regions 12, 22. It should be understood that the cross section of the struts may also be round or elongated, as well as the struts may be oblique and not necessarily be configured parallel to the longitudinal direction of the switching chamber insulation arrangement.

FIG. 12 shows a sectional view through a portion of a gas-insulated circuit breaker. The circuit breaker in this case has a housing 111 which encloses a gas space. Within the gas space are the two contact poles 1 and 2 of the circuit breaker. In the embodiment shown here the FIG. 12 the first contact pole 1 has a movable part 1a, which is axially movable along a longitudinal extension direction L. During a movement of the movable part 1a, in the embodiment shown here, the rated current contacts 8 first open, so that the current commutates to the arcing contact 8a. In a further axial apart then opens the arcing contact 8a. In this way, the current can commute from the rated current contacts 8 at an opening on the arcing contact 8a and be reliably deleted in this area. In this way, the rated current contacts 8 are not claimed by the resulting arc when opening, which claimed only the arcing contacts 8a in the embodiment shown here. In this way, the heat development can be reduced by maintaining the contact surfaces of the rated current contacts 8. The struts 10, 20 each have central regions 12, 22, whose center axes are displaced radially outward relative to the central axes of the foot points 11, 21 and 13, 23. The bases are attached to the respective contact poles 1, 2 of the circuit breaker, here for example by a Screwing. The field increase by, for example, the screw edges can be compensated for by covering the base point regions 11, 21, 13, 23 by corresponding field control elements 4, 6, which are correspondingly conductively connected via a conductive connection 5 or 7 to the corresponding contact poles 1, 2. In this way, impermissible field increases, in particular with respect to the outer housing 102, can be substantially avoided.

FIG. 13 shows a sectional view through the switching chamber insulation assembly with the associated contacts along a parting line, which in FIG. 12 is drawn accordingly. In this case, the struts 10, 20 corresponding central portions 12, 22 which are elongated. The foot areas 13, 23 are offset from the central areas and thus have a center which lies radially further inwards. The struts can be made in the embodiment shown here from a polymer resin.

FIG. 14 shows a further embodiment of the invention, in which (analogous to FIG. 13 ) Middle portions 12, 22 of the struts 10, 20 displaced, ie cranked, are arranged. The central region 12, 22 can be provided, for example, with a shell 12b, 22b which lies radially on the outside. Radial outside means here with respect to the individual strut, but can also be understood with respect to the entire switching chamber insulation arrangement. In the first case, the shell 12b, 22b, for example, along the entire circumference of the central region of the strut may be arranged, but also designed as a half-shell, and in FIG. 14 is shown. The inner region, ie, radially inward, with respect to either the strut, but also within the switching chamber insulation assembly may be provided with a filler 12a, 22a. In this way, a particularly tensile and compressive force stable arrangement of the switching chamber isolation arrangement can be provided.

It should be noted that the term "comprising" does not exclude other elements, just as the term "one" and "an" does not exclude multiple elements. The reference numerals used are for convenience of reference only and are not to be considered as limiting, the scope of the invention being indicated by the claims.

Claims (14)

1. switching chamber isolation arrangement with
a strut assembly (100) having a plurality of struts (10, 20), each strut having a first foot region (11, 21), a second foot region (13, 23), and a midregion (12, 12) located between the first foot region and the second foot region , 22),
wherein the struts are arranged about a longitudinal axis (L) of the strut arrangement along a circumference (U),
wherein the strut arrangement comprises a first mechanical coupling region (101) on the side of the first foot regions for decoupling to a first pole of a circuit breaker and a second mechanical coupling region (103) on the side of the second foot regions for coupling to a second pole of a circuit breaker. 2. switching chamber isolation arrangement according to claim 1, wherein the struts (10, 20) in the central region (12, 22) have an elongated cross-section. The switching chamber isolation device according to any one of claims 1 and 2, wherein the respective first leg portions (11, 21) and the respective second leg portions (13, 23) face the respective center portions (12, 22) in a radial direction of the switching chamber isolation assembly with respect to the longitudinal extension axis (L) are offset by a distance (d). 4. switching chamber isolation arrangement according to one of claims 1 to 3, wherein the first foot portion (11, 21) of a respective strut (10, 20) relative to the associated second foot portion (13, 23) of this strut along the circumference (U) is displaced, so the struts are inclined with respect to the longitudinal axis (L). 5. switching chamber isolation arrangement according to one of claims 1 to 4, wherein the strut assembly (100) at least three struts (10, 20, 30). 6. switching chamber isolation arrangement according to one of claims 1 to 4, wherein the strut assembly (100) at least four struts (10, 20, 30, 40), wherein the struts (10, 20, 30, 40) alternately in opposite directions with respect to the longitudinal direction (L ) are inclined, such that a stiffening results in the circumferential direction about the longitudinal axis of extension. 7. switching chamber isolation arrangement according to one of claims 1 to 6, wherein in the first foot areas (11, 21) and the second Fußbereichen (13,23) each having a field control electrode (14) is embedded, wherein disposed within the field control electrode, a force receiving device (15) is. 8. switching chamber isolation arrangement according to one of claims 1 to 7, wherein the first foot portions (11, 21) of the struts (10, 20) are each formed integrally with a first carrier ring (60) and the second foot portions (13, 23) in each case in one piece a second carrier ring (70) are formed. 9. A switching chamber isolation assembly according to any one of claims 1 to 8, wherein the strut assembly (100) comprises a polymer resin and has a metal oxide-filled polymer resin in at least a portion of an electrical insulation stretch. 10. switching chamber isolation arrangement according to one of claims 1 to 9, wherein the central region (12, 22, 32) of at least one strut (10, 20, 30) with respect to the respective strut radially outer shell (12b, 22b) and with respect to the respective strut radially inward filling (12a, 22b). 11. Switching chamber isolation arrangement according to one of claims 1 to 10, wherein the circumference (U) is circular and / or the switching chamber insulation arrangement can be installed in a single-phase encapsulated circuit breaker. 13. Switching chamber isolation arrangement according to one of claims 1 to 12, wherein at least a part of the strut arrangement (100) is coated, in particular with a diffusion barrier (98). 14. Circuit breaker with
a switching chamber isolation arrangement (9) according to one of claims 1 to 13,
a first switch contact pole (1), and
a second switching contact pole (2),
wherein the circuit breaker is a single-phase encapsulated circuit breaker. 15. A circuit breaker according to claim 14, comprising a first field control cover (4) arranged at a rated current contact junction,
wherein the first field control cover (4) is electrically connected to the first switch contact pole (1) and / or the second switch contact pole (2),
and wherein the first mechanical coupling portion (101) on the first switch contact pole (1) and / or the second switch contact pole (2) under the first field control cover (4) is mechanically connected to the first switch contact pole.

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