AU2013245603B2

AU2013245603B2 - Circuit breaker arrangement having a metal-encapsulated circuit breaker housing

Info

Publication number: AU2013245603B2
Application number: AU2013245603A
Authority: AU
Inventors: Frank Ehrlich; Peter Gronbach; Bachir MAHMOUDI; Stefan ROSSA; Anne Schmidt; Jurgen Schops
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2012-04-13
Filing date: 2013-03-27
Publication date: 2016-11-03
Anticipated expiration: 2033-03-27
Also published as: EP2820730A1; WO2013152954A1; CN104205538B; DE102012206084A1; CN104205538A; RU2014145354A; AU2013245603A1

Abstract

The invention relates to a circuit breaker arrangement (1) having a metal-encapsulated circuit breaker housing (2) in which three switching units (5) are arranged, wherein the circuit breaker housing (2) has openings through which first and second connection lines (6, 7) of the switching units (5) pass, and wherein a fixed contact side (5.2) of the switching units (5) is mechanically held in the circuit breaker housing (2) solely by the first connection lines (6) which are connected to said fixed contact side. According to the invention, a drive contact side (5.1) of the switching units (5) is mechanically held in the circuit breaker housing (2) by means of a holder (11) which is mechanically coupled to the circuit breaker housing (2) and is composed of an electrically insulating material.

Description

1 2013245603 16 Sep 2016

CIRCUIT BREAKER ARRANGEMENT HAVING A METAL-ENCAPSULATED CIRCUIT BREAKER HOUSING

The invention relates to a circuit breaker arrangement. A high-voltage switch panel is known from the prior art, such as that described in EP 0 563 803 Al. In this encapsulated, gas-insulated high-voltage switch panel, the three switch poles are accommodated in a cylindrical switch housing. Tubular attachments are integrally formed on opposite outer sides of said switch housing, conductors which are arranged in the comers of a triangle being introduced by means of said tubular attachments. The switch poles are arranged one behind the other on one line and are supported in a load-bearing manner only by means of the conductors.

The invention is based on the object of specifying an improved circuit breaker arrangement. A circuit breaker arrangement has a metal-encapsulated circuit breaker housing in which three switching units are arranged, wherein the circuit breaker housing has openings through which first and second connection lines of the switching units are routed, and wherein a fixed contact side of the switching units is mechanically held in the circuit breaker housing solely by the first connection lines which are connected to said fixed contact side. A drive contact side of the switching units is mechanically held in the circuit breaker housing by means of a holder which is mechanically coupled to the circuit breaker housing and is composed of an electrically insulating material, the drive contact side and fixed contact side are free of any insulating connection between voltage carrying parts of the said sides for transmission of mechanical forces.

On account of the above arrangement, an electrically insulating connection is not required between the voltage-carrying parts of the fixed contact side and the drive contact side of the respective switching unit. In the prior art, connections of this kind are required in order to transmit forces and torques between the two sides of the respective switching unit, for example forces owing to thermal expansion, electromagnetic forces and switching forces. Furthermore, a AH25(11771101_l):dah 2 2013245603 16 Sep 2016 supporting insulator, which connects the fixed contact side of the respective switching unit to the circuit breaker housing, is not required.

Instead, in the above arrangement, the fixed contact side of the switching unit is mechanically held in the circuit breaker housing solely by the first connection lines which are connected to it, that is to say preferably by busbar conductors, and the drive contact side of the respective switching unit may have, in the form of the holder, an insulated support in respect of the circuit breaker housing, which insulated support can be produced in a simple and very cost-effective manner. As a result, cost savings are made compared to circuit breakers known from the prior art, and a simple, compact and cost-effective design of the circuit breaker arrangement is possible.

The drive contact side of the respective switching unit is advantageously suspended in said holder, that is to say said drive contact side is preferably fastened to the holder by way of an upper region. A lower region of the drive contact side of the respective switching unit is then arranged such that it is suspended freely in the circuit breaker housing. The second connection lines are advantageously connected in a central or lower region of the drive contact side of the respective switching unit, so that the drive contact side of the respective switching unit is then, for example, also additionally supported by said second connection lines, in particular laterally supported, that is to say in the transverse direction in relation to a longitudinal extent of the switching unit. Since the drive contact side of the switching units is not held in the circuit breaker housing by said second connection lines, but rather by the holder, and can be secured and supported by the second connection lines solely additionally against lateral movements, said second connection lines can be designed to be less solid, so that the installation space required by the circuit breaker arrangement is reduced.

The holder is expediently formed from a plastic. It is also possible for only subregions of the holder to be formed in an insulating manner, that is to say preferably from plastic, and for other subregions, for example fastening units by means of which the drive contact sides of the switching units can be connected or are connected to the holder, to be formed from metal for example, in order to thereby allow the drive contact sides of the switching units to be fastened to the holder better. In this case, it is only necessary to ensure that electrically insulating regions of the holder are arranged between the fastening units and the circuit breaker housing, that is to say that there is no electrically conductive connection from the switching units, via the holder, to the AH25(11771101 l):dah 3 2013245603 16 Sep 2016 circuit breaker housing. As a result, the holder can be manufactured in a simple, rapid and cost-effective manner, for example in a casting process, for example in an injection-molding process. Furthermore, the plastic ensures the electrically insulating effect of the holder. Suitable plastics of this kind for producing the holder are, preferably, a cast resin, in particular an epoxy resin.

The holder is advantageously in the form of an insulating plate or the holder is particularly preferably in the form of a framework structure which has a plurality of webs for holding AH25(11771101_l):dah

PCT/EP2013/056539 2012P02808WOIN 3a fastening units for the drive contact side of the switching units. The insulating

PCT/EP2013/056539 2012P02808WOIN 4 plate can be produced in a particularly simple and cost-effective manner. However, designing the holder in the form of the framework structure is particularly advantageous. Said framework structure extends in one plane, wherein the fastening units are connected by means of the webs to one another and to fastening points by means of which the holder is mechanically connected to the circuit breaker housing. The framework structure can likewise be mass-produced in a very simple and cost-effective manner, for example, by means of a correspondingly shaped casting mold. In this case, material is saved on account of the framework structure. In addition, forces which have a very powerful impact, for example forces owing to thermal expansion, electromagnetic forces and switching forces, can be absorbed and dissipated by means of the webs of the framework structure. In this case, the framework structure and, in particular, the webs of said framework structure, that is to say the number, profile and design of said webs, can be dimensioned to meet the respective requirements, in order to be able to absorb the occurring forces in an optimum manner and to dissipate said forces to the circuit breaker housing. A further great advantage of said framework structure is a substantially smaller surface in comparison to an insulating plate, in particular on a top side of the holder, so that an accumulation of particles on the surface is greatly reduced. An accumulation of particles of this kind, this forming, for example, due to friction owing to movements of the moving contacts of the circuit breaker arrangement, that is to say the drive contact side of the switching units, due to decomposition products caused by an arc between the electrical contacts and/or due to an insulating gas of the circuit breaker arrangement and also being called switching dust, can result in an electrically conductive connection being formed between the switching units and the circuit breaker housing. This danger is

PCT/EP2013/056539 2012P02808WOIN 4a greatly reduced by the surface of the holder being considerably reduced on account of the framework structure.

PCT/EP2013/056539 2012P02808WOIN 5

In order to further reduce the surface, in particular the top side of the holder, and as a result the accumulation of particles on the holder, a cross section of the webs preferably reduces from a bottom side in the direction of a top side, in particular the cross section reduces in a substantially uniform manner. This ensures a requisite stability of the holder by the webs being designed to be sufficiently strong, and a surface of the top side of the holder which is as small as possible for the respectively required stability is achieved. Furthermore, in this way, side walls of the webs are oriented at an angle of greater than 0° and less than 90° with respect to the horizontal, that is to say the webs have sloping side walls on which particles do not accumulate, but rather said particles slide off the side walls. A top-most region of each web is advantageously rounded or tapers to a point at the top. In this way, the top side of the holder does not have a horizontally oriented surface on which particles could accumulate, or the horizontally oriented surface is at least minimized.

Expediently, the cross section of the webs is substantially triangular. As a result, both the stability of the webs is optimized and also the horizontally oriented surface on the top side of the holder is minimized.

The circuit breaker housing preferably has at least one molding on which the holder rests. Said molding can, for example, be in the form of a circumferential web, or a plurality of moldings on which the holder rests by way of different regions are formed on an inner face of the circuit breaker housing. The molding or the plurality of moldings can be formed in a simple manner in the circuit breaker housing during production of the circuit breaker housing, for example by shaping of the circuit breaker housing or as early as

PCT/EP2013/056539 2012P02808WOIN 6 during formation of the circuit breaker housing, for example in a casting process.

The holder is expediently connected to the circuit breaker housing in an interlocking, force-fitting and/or cohesive manner. In this case, the holder can be placed, for example, solely on one or more moldings of the circuit breaker housing. However, the holder is advantageously fastened to moldings of this kind in such a way that movements of the holder are prevented. Therefore, the holder is preferably screwed to the circuit breaker housing. However, said holder can, for example, also be riveted, adhesively bonded or caulked to the circuit breaker housing. A combination of several of such fastening methods is also possible.

The drive contact side of the switching units is expediently fastened to the holder in an interlocking, force-fitting and/or cohesive manner. Said fastening can likewise be performed, for example, by screwing, riveting, adhesive bonding and/or by caulking. Drive elements for closing and opening the switching units are expediently routed through openings in the holder and, for example, routed upward out of the circuit breaker housing, so that they can be coupled or are coupled to a corresponding drive.

An interior of the circuit breaker housing is expediently filled with an insulating gas. This increases a dielectric strength and allows a compact design of the circuit breaker arrangement. As an alternative, it is possible, in order to achieve these advantages, for the interior of the circuit breaker housing to also be filled with air for example, wherein in this case an air pressure of the air in the circuit breaker housing is advantageously higher than an ambient air pressure of the circuit breaker arrangement.

PCT/EP2013/056539 2012P02808WOIN 7

The circuit breaker housing is preferably cylindrical, wherein the switching units are arranged in the circuit breaker housing in the axial direction of said circuit breaker housing. This allows a design of the circuit breaker housing which is compact, installation space-saving and at the same time stable and can be produced in a simple manner. The connection lines or at least some of the connection lines can be arranged in the circuit breaker housing so as to run parallel to the switching units at least in regions, for example. A requisite installation space is available in the case of a cylindrical circuit breaker housing.

The three switching units are preferably arranged parallel to one another and next to one another on one line. This ensures the requisite installation space in the circuit breaker housing for the connection lines.

In one possible embodiment, the circuit breaker arrangement comprises at least one bushing-type current transformer, the active parts of said bushing-type current transformer extending from the circuit breaker housing into an opening in the circuit breaker housing. A current intensity of a current respectively flowing through the connection lines can be ascertained using said bushing-type current transformer.

The above-described properties, features and advantages of this invention and also the way in which said properties, features and advantages are achieved will become clearer and easier to understand in connection with the following description of exemplary embodiments which will be explained in greater detail in connection with the drawings, in which: figure 1 schematically shows a longitudinal sectional illustration of a circuit breaker arrangement,

PCT/EP2013/056539 2012P02808WOIN 7a figure 2 schematically shows a circuit breaker arrangement in plan view from above with the circuit breaker housing open,

PCT/EP2013/056539 2012P02808WOIN figure 3 figure 4 figure 5 figure 6 figure 7 figure 8 figure 9 figure 10 schematically shows a perspective illustration of a circuit breaker arrangement from above with the circuit breaker housing open, schematically shows a perspective illustration of a holder of a drive contact side of switching units of a circuit breaker arrangement, schematically shows an illustration of a holder of a drive contact side of switching units of a circuit breaker arrangement in plan view, schematically shows a side view of a holder of a drive contact side of switching units of a circuit breaker arrangement, schematically shows a sectional illustration of a holder of a drive contact side of switching units of a circuit breaker arrangement along section line VII-VII in figure 5, schematically shows a sectional illustration of a holder of a drive contact side of switching units of a circuit breaker arrangement along section line VIII-VIII in figure 5, schematically shows a sectional illustration of a holder of a drive contact side of switching units of a circuit breaker arrangement along section line IX-IX from figure 5, and schematically shows a sectional illustration of a holder of a drive contact side of switching units of a circuit breaker arrangement along section line X-X from figure 5.

PCT/EP2013/056539 2012P02808WOIN 9

Parts which correspond to one another are provided with the same reference symbols throughout the figures.

Figures 1 to 3 show a circuit breaker arrangement 1 having a substantially cylindrical, metal-encapsulated circuit breaker housing 2. This is shown in a longitudinal sectional illustration in figure 1, and from above in plan view and, respectively, in a perspective illustration in figures 2 and 3. In the views from above, an upper covering 3 and a drive unit 4 of the circuit breaker arrangement 1 are removed, so that it is possible to look into an interior of the circuit breaker housing 2.

Three switching units 5 are arranged in the circuit breaker housing 2. Said switching units 5, which are also called interrupter units or circuit breaker poles, are arranged parallel to one another and next to one another on a line and are oriented in the axial direction of the circuit breaker housing 2. The circuit breaker housing 2 is closed in a gas-tight manner and filled with an insulating gas in an operating state of the circuit breaker arrangement 1.

The circuit breaker housing 2 has, on opposite longitudinal sides, openings through which first connection lines 6 and second connection lines 7 of the switching units 5 can be routed. The second connection lines 7 are in each case electrically connected to a drive contact side 5.1, and the first connection lines 6 are in each case electrically connected to a fixed contact side 5.2 of the respective switching unit 5, for example by means of corresponding plug contacts which allow both electrical and also mechanical connection of the connection lines 6, 7 to the respective switching unit 5. The first and second connection lines 6, 7 are routed out of the circuit breaker housing 2 in a gas-tight manner through said openings, and connected, for example, to connection conductors, not illustrated here.

PCT/EP2013/056539 2012P02808WOIN 10

In this case, the connection lines 6, 7 are expediently routed through the openings in such a way that they are arranged in the respective opening at corner points of a triangle, that is to say in each case two connection lines 6, 7 are arranged next to one another in the respective opening and a further connection line 6, 7 is arranged above the two lower connection lines 6, 7 and on a vertical plane which runs through between the two lower connection lines 6, 7. The openings are in the form of tubular attachments 8 which are closed by insulating bushing-type plates 9 in order to close the circuit breaker housing 2 in a gas-tight manner. One of said tubular attachments 8, through which no connection lines 6, 7 are routed in this exemplary embodiment, is closed in a gas-tight manner by a cover 10.

The fixed contact side 5.2 of the switching units 5 is mechanically held in the circuit breaker housing 2 solely by the first connection lines 6 which are connected to said fixed contact side. The drive contact side 5.1 of the switching units 5 is mechanically held in the circuit breaker housing 2 by means of a holder 11 which is mechanically coupled to the circuit breaker housing 2 and is composed of an electrically insulating material. An exemplary embodiment of a holder 11 of this kind is schematically illustrated in figures 4 to 10.

Owing to this design of the circuit breaker arrangement 1, no electrically insulating connection is required between voltagecarrying parts of the fixed contact side 5.2 and the drive contact side 5.1 of the respective switching unit 5. In the prior art, connections of this kind are required in order to transmit forces and torques between the two sides of the respective switching unit 5, for example forces owing to thermal expansion, electromagnetic forces and switching forces. Furthermore, a supporting insulator, which connects the fixed contact side 5.2 of the respective switching unit 5 to the circuit breaker housing 2, is not required.

PCT/EP2013/056539 2012P02808WOIN 11

Instead, in the illustrated circuit breaker arrangement 1, the fixed contact side 5.2 of the respective switching unit 5 is mechanically held in the circuit breaker housing 2 solely by the first lines 6 which are connected to it, that is to say by busbar conductors, and the drive contact side 5.1 of the respective switching unit 5 has, in the form of the holder 11, an insulated support in respect of the circuit breaker housing 2, which insulated support can be produced in a simple and very cost-effective manner. As a result, cost savings are made compared to circuit breakers known from the prior art, and a simple, compact and cost-effective design of the circuit breaker arrangement 1 is possible.

The drive contact side 5.1 of the respective switching unit 5 is advantageously suspended in said holder 11, that is to say said drive contact side is fastened to the holder 11 by way of an upper region, as illustrated in this exemplary embodiment. A lower region of the drive contact side 5.1 of the respective switching unit 5 is then arranged such that it is suspended freely in the circuit breaker housing 2. The second connection lines 7 are advantageously connected in a central or lower region of the drive contact side 5.1 of the respective switching unit 5, so that the drive contact side 5.1 of the respective switching unit 5 is then, for example, also additionally supported by said second connection lines 7, in particular laterally supported, that is to say in the transverse direction in relation to a longitudinal extent of the switching unit 5. Since the drive contact side 5.1 of the switching units 5 is not held in the circuit breaker housing 2 by said second connection lines 7, but rather by the holder, and can be secured and supported by the second connection lines 7 solely additionally against lateral movements, said second connection lines 7 can be designed to be less solid, so that the installation space required by the circuit breaker arrangement 1 is reduced.

PCT/EP2013/056539 2012P02808WOIN 12

The holder 11 is expediently formed from a plastic. It is also possible for only subregions of the holder 11 to be formed in an insulating manner, that is to say preferably from plastic, and for other subregions, for example fastening units 12 by means of which the drive contact sides 5.1 of the switching units 5 can be connected or are connected to the holder 11, to be formed from metal for example, in order to thereby allow the drive contact sides 5.1 of the switching units 5 to be fastened to the holder 11 better. In this case, it is only necessary to ensure that electrically insulating regions of the holder 11 are arranged between the fastening units 12 and the circuit breaker housing 2, that is to say that there is no electrically conductive connection from the switching units 5, via the holder 11, to the circuit breaker housing 2.

As a result, the holder 11 can be manufactured in a simple, rapid and cost-effective manner, for example in a casting process, for example in an injection-molding process. Furthermore, the plastic ensures the electrically insulating effect of the holder 11. Suitable plastics of this kind for producing the holder 11 are, preferably, a cast resin, in particular an epoxy resin.

The holder 11 is advantageously in the form of an insulating plate or the holder 11 is, as in the exemplary embodiment illustrated here, particularly preferably in the form of a framework structure which has a plurality of webs 13 for holding the fastening units 12 for the drive contact side 5.1 of the switching units 5. The embodiment of the insulating plate, not illustrated here, can be produced in a particularly simple and cost-effective manner.

However, designing the holder 11 in the form of the framework structure illustrated here is particularly advantageous. Said framework structure extends in one plane, wherein the fastening

PCT/EP2013/056539 2012P02808WOIN 12a units 12 are connected by means of the webs 13 to one another and to fastening points 14 by means of which the

PCT/EP2013/056539 2012P02808WOIN 13 holder 11 is mechanically connected to the circuit breaker housing 2. The framework structure can likewise be mass-produced in a very simple and cost-effective manner, for example by means of a correspondingly shaped casting mold. In this case, material is saved on account of the framework structure. In addition, forces which have a very powerful impact, for example forces owing to thermal expansion, electromagnetic forces and switching forces, can be absorbed and dissipated by means of the webs 13 of the framework structure. In this case, the framework structure and, in particular, the webs 13 of said framework structure, that is to say the number, profile and design of said webs, can be dimensioned to meet the respective requirements, in order to be able to absorb the occurring forces in an optimum manner and to dissipate said forces to the circuit breaker housing 2. A further great advantage of said framework structure is a substantially smaller surface in comparison to an insulating plate, in particular on a top side of the holder 11, so that an accumulation of particles on the surface is greatly reduced. An accumulation of particles of this kind, this forming, for example, due to friction owing to movements of the moving contacts of the circuit breaker arrangement, that is to say the drive contact side 5.1 of the switching units 5, due to decomposition products caused by an arc between the electrical contacts and/or due to an insulating gas of the circuit breaker arrangement 1 and also being called switching dust, can result in an electrically conductive connection being formed between the switching units 5 and the circuit breaker housing 2. This danger is greatly reduced by the surface of the holder 11 being considerably reduced on account of the framework structure.

In order to further reduce the surface, in particular the top side of the holder 11, and as a result the accumulation of particles on the holder 11, a cross section of the webs 13 reduces from a bottom side in the direction of a top side, in

PCT/EP2013/056539 2012P02808WOIN 13a particular the cross section reduces in a substantially uniform manner. This ensures a requisite stability

PCT/EP2013/056539 2012P02808WOIN 14 of the holder 11 by the webs 13 being designed to be sufficiently strong, and a surface of the top side of the holder 11 which is as small as possible for the respectively required stability is achieved. Furthermore, in this way, side walls 13.1 of the webs 13 are oriented at an angle of greater than 0° and less than 90° with respect to the horizontal, that is to say the webs 13 have sloping side walls 13.1 on which particles do not accumulate, but rather said particles slide off the side walls 13.1. A top-most region of each web 13 is rounded or tapers to a point at the top. In this way, the top side of the holder 11 does not have a horizontally oriented surface on which particles could accumulate, or the horizontally oriented surface is at least minimized.

The cross section of the webs 13 is substantially triangular. As a result, both the stability of the webs 13 is optimized and also the horizontally oriented surface on the top side of the holder 11 is minimized.

In this exemplary embodiment, the circuit breaker housing 2 has, as illustrated in figures 2 and 3, four moldings 15 on an inner face, the holder 11 resting on said four moldings by way of a fastening point 14 in each case. Webs 13 of the framework structure which are relatively strong meet at said fastening points 14 of the holder 11, so that the fastening units 12 are supported and mechanically held on the moldings 15 of the circuit breaker housing 2 by means of said relatively strong webs 13.

In other exemplary embodiments, not illustrated here, the circuit breaker housing 2 can also have, for example, a molding 15 which is, for example, in the form of a circumferential edge in this case. The molding 15 or the plurality of moldings 15 can be formed in a simple manner in the circuit breaker housing

PCT/EP2013/056539 2012P02808WOIN 14a 2 during production of said circuit breaker housing 2, for example by shaping of the circuit

PCT/EP2013/056539 2012P02808WOIN 15 breaker housing 2 or as early as during formation of the circuit breaker housing 2, for example in a casting process.

The holder 11 is expediently connected to the circuit breaker housing 2 in an interlocking, force-fitting and/or cohesive manner. In this case, the holder 11 can be placed, for example, solely on the moldings 15 of the circuit breaker housing 2. However, the holder 11 is, as illustrated in figures 2 and 3, preferably fastened to the moldings 15 in such a way that movements of the holder 11 are prevented. Therefore, in this exemplary embodiment, the holder 11 is screwed to the circuit breaker housing 2. However, in other embodiments not illustrated here, said holder can, for example, also be riveted, adhesively bonded or caulked to the circuit breaker housing 2. A combination of several of such fastening methods is also possible.

The drive contact side 5.1 of the switching units 5 is expediently fastened to the holder 11 in an interlocking, force-fitting and/or cohesive manner. In this exemplary embodiment, said fastening is performed, as illustrated in figures 2 and 3, by screwing a cast body 16, that is to say a unit of the respective drive contact side 5.1, which unit is cast from metal, to the respective fastening unit 12 of the holder 11, but can also be performed, for example, by riveting, adhesive bonding and/or by caulking in further embodiments.

The cast bodies 16 have a hollow interior in which a movable pole contact bar 17 of the drive contact side 5.1 of the switching unit 5 is arranged in each case. Since said pole contact bars run in the interior of the respective cast body 16, they are not illustrated in any detail in figure 1. Said pole contact bars 17 are, at a top side, in each case coupled to a drive element 18, which is in the form of an insulating bar, for closing and opening an electrical

PCT/EP2013/056539 2012P02808WOIN 16 contact between the fixed contact side 5.2 and the drive contact side 5.1 of the switching units 5. The drive elements 18 are routed through openings in the holder 11, specifically through openings in the fastening units 12, upward through the upper covering 3 and out of the circuit breaker housing 2, and coupled to a corresponding drive unit 4 outside the circuit breaker housing 2. Said drive unit 4 is in the form of a stored-energy spring mechanism in the example illustrated here.

The switching units 5 furthermore have a plurality of gas nozzle units 19 for guiding the insulating gas to an arc which is formed during closing and opening of the contacts, and outlet openings 20 for insulating gas which is heated by the arc .

The switching units 5 are in an open state in the example illustrated in figure 1. After a drive unit 4 which is in the form of a stored-energy spring mechanism is tripped, a connecting bar 21 moves, in a manner driven by said drive unit, in the direction of the circuit breaker housing 2 . Said connecting bar 21 is coupled to the drive elements 18, which are in the form of insulating bars, by means of a lever mechanism 22, so that the movement of the connecting bar 21 is deflected onto the drive elements 18 in such a way that the drive elements 18 move downward, that is to say into the circuit breaker housing 2. As a result, said drive elements push the pole contact bars 17 in the direction of the fixed contact side 5.2 of the switching units 5. This leads to the electrical contact between the fixed contact side 5.2 and the drive contact side 5.1 of the switching units 5 closing, that is to say to the circuit breaker closing. The circuit breaker is opened, that is to say the electrical contacts between the fixed contact side 5.2 and the drive contact side 5.1 of the switching units 5 are opened, in a correspondingly opposite way.

PCT/EP2013/056539 2012P02808WOIN 17

The circuit breaker arrangement 1 furthermore comprises a bushing-type current transformer 23, the active parts of said bushing-type current transformer extending from the cylindrical circuit breaker housing 2 into one of the openings in the circuit breaker housing 2 which is in the form of a tubular attachment 8 which adjoins the circuit breaker housing 2. A current intensity of a current respectively flowing through the connection lines 6, 7 can be ascertained using said bushing-type current transformer 23.

Although the invention has been illustrated and described in detail by a preferred exemplary embodiment, the invention is not limited by the disclosed examples, and other variations can be derived from said examples by a person skilled in the art, without departing from the scope of protection of the invention.

Claims

1. A circuit breaker arrangement having a metal-encapsulated circuit breaker housing in which three switching units are arranged, wherein the circuit breaker housing has openings through which first and second connection lines of the switching units are routed, and wherein a fixed contact side of the switching units is mechanically held in the circuit breaker housing solely by the first connection lines which are connected to said fixed contact side, wherein a drive contact side of the switching units is mechanically held in the circuit breaker housing by means of a holder which is mechanically coupled to the circuit breaker housing and is composed of an electrically insulating material, and wherein the drive contact side and fixed contact side are free of any insulating connection between voltage carrying parts of the said sides for a transmission of mechanical forces.

2. The circuit breaker arrangement as claimed in claim 1, wherein the holder is formed from a plastic.

3. The circuit breaker arrangement as claimed in claim 2, wherein the plastic is a cast resin in particular an epoxy resin.

4. The circuit breaker arrangement as claimed in claim 3, wherein the cast resin is an epoxy resin.

5. The circuit breaker arrangement as claimed in any one of claims 1 to 4, wherein the holder is in the form of an insulating plate or is in the form of a framework structure which has a plurality of webs for holding fastening units for the drive contact side of the switching units.

6. The circuit breaker arrangement as claimed in claim 5, wherein a cross section of the webs reduces from a bottom side in the direction of a top side.

7. The circuit breaker arrangement as claimed in claim 6, wherein an uppermost region of each web is rounded or tapers to a point at the top.

8. The circuit breaker arrangement as claimed in claim 6 or 7, wherein the cross section of the webs is substantially triangular.

9. The circuit breaker arrangement as claimed in any one of the preceding claims, wherein the circuit breaker housing has at least one molding on which the holder rests.

10. The circuit breaker arrangement as claimed in any one of the preceding claims, wherein the holder is connected to the circuit breaker housing in an interlocking, force-fitting and/or cohesive manner.

11. The circuit breaker arrangement as claimed in one of the preceding claims, wherein the holder is screwed to the circuit breaker housing.

12. The circuit breaker arrangement as claimed in any one of the preceding claims, wherein the drive contact side of the switching units is fastened to the holder in an interlocking, force-fitting and/or cohesive manner.

13. The circuit breaker arrangement as claimed in any one of the preceding claims, wherein an interior of the circuit breaker housing is filled with an insulating gas.

14. The circuit breaker arrangement as claimed in any one of the preceding claims, wherein the circuit breaker housing is cylindrical, wherein the switching units are arranged in the circuit breaker housing in the axial direction of said circuit breaker housing.

15. The circuit breaker arrangement as claimed in any one of the preceding claims, wherein the three switching units are arranged parallel to one another and next to one another on one line.

16. The circuit breaker arrangement as claimed in any one of the preceding claims, comprising at least one bushing-type current transformer, the active parts of said bushing-type current transformer extending from the circuit breaker housing into an opening in the circuit breaker housing.