Abstract:
A metal-encapsulated, gas-insulated high-voltage switchgear assembly includes a three-phase encapsulated busbar housing, at least one busbar disposed in the housing, and at least three single-phase-encapsulated circuit breakers disposed horizontally. The assembly further includes a busbar splitting module having at least one three-phase connecting flange configured to connect to the busbar housing and at least three single-phase connecting flanges pointing downward configured to connect to the at least three single-phase-encapsulated circuit breakers and an outgoer splitting module having at least one three-phase flange and at least three single-phase flanges pointing downward and configured to connect the at least three single-phase-encapsulated circuit breakers to a three-phase-encapsulated outgoer housing.

Description:
This is a U.S. National Phase Application under 35 U.S.C. §371 of International Application PCT/EP2008/004167, filed on May 26, 2008, which claims priority to German Application No. DE 10 2007 025 536.7, filed on May 31, 2007 and German Application No. DE 10 2007 047 200.7, filed on Oct. 2, 2007. The International Application was published in German on Dec. 4, 2008 as WO 2008/145324 under PCT Article 21 (2). 
     The invention relates to a metal-encapsulated, gas-insulated high-voltage switchgear assembly. 
     BACKGROUND 
     It is known for single-phase-encapsulated circuit breakers which each have a separate encapsulating housing and a separate drive to be used in gas-insulated high-voltage assemblies with rated voltages of 200 kV and more. 
     Such a metal-encapsulated, gas-insulated high-voltage switchgear assembly is known from EP 0872931 A2 which has single-phase-encapsulated circuit breakers and single-phase-encapsulated busbars. The circuit breakers are in this case arranged horizontally on a plane, with the housing of the busbars being arranged above the circuit breakers. Each busbar comprises three housings which are arranged parallel to one another, specifically in each case one housing for each phase conductor, with the longitudinal axes of these housings running at right angles to the longitudinal axes of the circuit breakers. 
     A high-voltage switchgear assembly such as this occupies a relatively large amount of space, in particular because an unusable empty space remains between the individual components. 
     SUMMARY OF THE INVENTION 
     An aspect of the invention is to design a high-voltage switchgear assembly of the type mentioned initially such that the space requirement is minimized. 
     According to the invention, the at least one busbar is arranged in a three-phase-encapsulated busbar housing, that is to say that all three phase conductors of the busbar are located in common encapsulation. A busbar splitting module which has three single-phase connecting flanges for connecting the circuit breakers and at least one three-phase connecting flange for connecting the busbar housing is provided for connection of the circuit breakers to the busbar housing. An outgoer splitting module which has three single-phase connecting flanges and at least one three-phase flange is provided for connection of the circuit breakers to a three-phase-encapsulated outgoer housing. The busbar splitting module and the outgoer splitting module are in this case arranged such that the single-phase connecting flanges point downward. 
     In this context, a single-phase connecting flange means a connecting flange through which a single phase conductor is passed. In this context, a three-phase connecting flange means a connecting flange through which three phase conductors of a three-phase system are passed. 
     This arrangement advantageously reduces the space requirement of the high-voltage switchgear assembly. 
     Isolators and grounding means associated with the at least one busbar are advantageously arranged in the busbar housing. These mechanically moving elements are therefore relatively easily accessible for maintenance or repair purposes. No mechanically moving elements that require maintenance are provided in the busbar splitting module, which is surrounded by other components such as busbar housings and circuit breakers and to which access is therefore relatively difficult. 
     According to one advantageous refinement of the invention, one extension tube is provided in each case for each phase, between the outgoer splitting module and the circuit breakers. The use of extension tubes such as these allows variable-height positioning the flange for connection of the outgoer housing. This is advantageous, for example, for use in a cable outgoer panel, since the connecting flange of a cable outgoer housing is located at a predetermined minimum height above the ground, by virtue of its design. A further advantage is that a current transformer can be provided in each of the extension tubes. 
     Alternatively or in addition to the extension tubes, an angle module is provided on the outgoer splitting module on which an adaptor flange for connection of a voltage converter or of a test adaptor, as well as an outgoer flange for connection of the outgoer housing are provided. 
     According to a further advantageous refinement of the invention, a gangway is provided between the busbar splitting module and the outgoer splitting module, and extends parallel to the busbar housing. A gangway such as this simplifies the access to further components of the high-voltage switchgear assembly, such as drive boxes or current transformers. 
     In one advantageous development, at least four three-phase connecting flanges, in each case for the connection of one busbar housing, are provided on the busbar splitting module. A busbar splitting module such as this, which is also referred to as a quadruple busbar splitting module, allows comparatively flexible operation of the high-voltage switchgear assembly. For example, all four connected busbars can be switched independently of one another. In this case, by way of example, three busbars may be in operation while the fourth busbar is used as a spare. It is also feasible for two busbars to be connected in parallel in each case, and to be operated as a busbar pair. This results in the high-voltage switchgear assembly having two busbar pairs, with the advantage that the rated current of a busbar pair is twice as high as the rated current of a single busbar. 
     The busbar splitting module normally has an cylindrical housing body and at least four three-phase connecting stubs, which project out of the housing body of the busbar splitting module in the radial direction. As used herein, cylindrical means approximately cylindrical. One three-phase connecting flange is in this case attached to each connecting stub. 
     Each of the three-phase connecting stubs of the busbar splitting module is in this case arranged offset with respect to the respectively adjacent three-phase connecting stub, both in the axial direction and in the circumferential direction with respect to the housing body. This offsetting of the three-phase connecting stubs in the axial direction and in the circumferential direction prevents the three-phase connecting flanges from colliding with one another. 
     Further advantageous refinements of the invention can be found in the dependent claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention, advantageous refinements and improvements of the invention, as well as further advantages will be explained and described in more detail with reference to the drawings, in which exemplary embodiments of the invention are illustrated, and in which: 
         FIG. 1  shows a first cable outgoer panel of a switchgear assembly according to the invention, 
         FIG. 2  shows a second cable outgoer panel of a switchgear assembly according to the invention, in the form of a perspective illustration, 
         FIG. 3  shows a third cable outgoer panel of a switchgear assembly according to the invention, 
         FIG. 4  shows a front view of the first cable outgoer panel from  FIG. 1 , 
         FIG. 5  shows a side view of a quadruple busbar splitting module, 
         FIG. 6  shows a quadruple busbar splitting module with connected busbars, and 
         FIG. 7  shows a front view of a quadruple busbar splitting module. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a first cable outgoer panel of a switchgear assembly according to the invention. Three single-phase-encapsulated circuit breakers  11 ,  12 ,  13 , of which only the first circuit breaker  11  can be seen in the illustration shown, are arranged such that their longitudinal axes run parallel to one another and parallel to the ground. Expressed in other words, the single-phase circuit breakers  11 ,  12 ,  13  are arranged horizontally. The distance between the circuit breakers  11 ,  12 ,  13  and the ground is in this case the same. 
     The circuit breakers  11 ,  12 ,  13  are arranged close to the ground, and this is referred to in the following text as “bottom”. The position of the components arranged at a distance from the ground is correspondingly referred to as “top”. 
     The first circuit breaker  11  has an input flange  21 , which is adjacent to the front face of the cable outgoer panel, and an output flange  22 , which is adjacent to the rear face of the cable outgoer panel, which flanges are aligned parallel to the ground and point upward. 
     A busbar splitting module  31  is provided for connection of the circuit breakers  11 ,  12 ,  13  to a first busbar housing  51  and to a second busbar housing  52 . The busbar splitting module  31  has three single-phase connecting flanges  41 ,  42 ,  43 , of which only the first single-phase connecting flange  41  can be seen in this illustration. Furthermore, the busbar splitting module  31  has a first three-phase connecting flange  61  for connection of the first busbar housing  51 , and a second three-phase connecting flange  62  for connection of the second busbar housing  52 . 
     The first single-phase connecting flange  41  of the busbar splitting module  31 , which points downward, is connected to the input flange  21  of the first circuit breaker  11 . The other single-phase connecting flanges of the busbar splitting module  31  are likewise connected to the input flanges of the second circuit breaker  12  and of the third circuit breaker  13 . 
     The busbar splitting module  31  is mounted on the circuit breakers  11 ,  12 ,  13  such that the single-phase connecting flanges  41 ,  42 ,  43  point downward. Expressed in other words, the busbar splitting module  31  is arranged vertically on the circuit breakers  11 ,  12 ,  13 . 
     The second three-phase connecting flange  62  of the busbar splitting module  31 , which points upwards, is connected to the second busbar housing  52 . The first three-phase connecting flange  61  of the busbar splitting module  31 , which points toward the front face, is connected to the first busbar housing  51 . 
     The first busbar housing  51  is therefore located at the side of the busbar splitting module  31 , while the second busbar housing  52  is located above the busbar splitting module  31 . The circuit breakers  11 ,  12 ,  13  are located underneath the busbar splitting module  31 . 
     A respective drive  14 ,  15 ,  16  is fitted on the front face to each of the circuit breakers  11 ,  12 ,  13 , of which drives only the first drive  14  of the first circuit breaker  11  can be seen in this illustration. The drives  14 ,  15 ,  16  are located under the first busbar housing  51 . 
     A control cabinet  35 , which contains components, which are not annotated in any more detail here, for controlling and monitoring the first cable outgoer panel, has an L-shaped housing and is arranged such that it partially clasps the first busbar housing  51 . The long limb of the L-shaped control cabinet  35  in this case extends at right angles to the ground on the front face alongside the first busbar housing  51  and further upward, while the short limb of the L-shaped control cabinet  35  extends parallel to the ground above the first busbar housing  51 , and further toward the front face. The control cabinet  35  therefore partially fills the space above the first busbar housing  51  and at the front alongside the second busbar housing  52 , matching the switchgear assembly contour. 
     An outgoer splitting module  32  is provided for connection of the circuit breakers  11 ,  12 ,  13  to an outgoer housing  71 . The outgoer splitting module  32  has three single-phase connecting flanges  44 ,  45 ,  46 , of which only the fourth single-phase connecting flange  44  can be seen in this illustration. Furthermore, the outgoer splitting module  32  has a three-phase connecting flange  65 , which points upward and is connected to an angle module  72 . 
     The fourth single-phase connecting flange  44  of the outgoer splitting module  32 , which points downward, is connected to the output flange  22  of the first circuit breaker  11 . The other single-phase connecting flanges of the outgoer splitting module  32  are likewise connected to the output flanges of the second circuit breaker  12  and of the third circuit breaker  13 . 
     The outgoer splitting module  32  is mounted on the circuit breakers  11 ,  12 ,  13  such that the single-phase connecting flanges  44 ,  45 ,  46  point downward. Expressed in other words, the outgoer splitting module  31  is arranged vertically on the circuit breakers  11 ,  12 ,  13 . 
     The angle module  72  has a three-phase adaptor flange  66  which points upward and is closed in the illustration shown. By way of example, a voltage converter or a test adaptor can be connected to this adaptor flange  66 , in order to carry out a high-voltage test. 
     The angle module  72  is located above the outgoer splitting module  32  and, at the rear, alongside the second busbar housing  52 . 
     The angle module  72  furthermore has a three-phase outgoer flange  67  which points to the rear face and to which the outgoer housing  71  is connected. In this case, a voltage converter  75  and a quick-action grounding means  73  are attached in a known manner to the outgoer housing  71 , with the voltage converter  75  pointing upward and the quick-action grounding means  73  pointing to the rear face. 
     Three single-phase high-voltage cables  81 ,  82 ,  83  are furthermore attached in a known manner to the outgoer housing  71 , although the third high-voltage cable  83  cannot be seen in this illustration. The high-voltage cables  81 ,  82 ,  83  point downward. 
     A three-phase high-voltage cable is also feasible, instead of the three single-phase high-voltage cables  81 ,  82 ,  83 . 
     A respective partition insulator is provided between each two connecting flanges of components of the switch panel which are connected to one another. A partition insulator such as this ensures that a module, for example the first busbar housing  51 , can be opened and/or removed for repair or maintenance purposes, with the adjacent module, for example the busbar splitting module  31 , remaining uninfluenced. This means that the insulating gas can remain in the busbar splitting module  31 , since the partition insulator seals the first three-phase connecting flange  61 . 
     The first busbar housing  51  is suspended at the front on the busbar splitting module  31 , and the second busbar housing  52  rests on the busbar splitting module  31 . The drives  14 ,  15 ,  16  of the circuit breakers  11 ,  12 ,  13  are located underneath the first busbar housing  51 . The control cabinet  35  is L-shaped, and partially fills the space above the first busbar housing  51  and alongside the second busbar housing  52 . 
     The angle module  72 , to which the outgoer housing  71  and the other components of a cable outgoer are connected in a known manner at the rear, is located on the outgoer splitting module  32 . 
     In this illustration, the voltage converter  75  is connected to the outgoer housing  71 . The voltage converter  75  can also be connected to the three-phase adaptor flange  66 , which points upward, of the angle module  72 . In this case, the outgoer housing  71  has a free flange, which points upward, for connection of a test adaptor in order to carry out a high-voltage test. 
     This arrangement of the components in the cable outgoer panel as described here optimally utilizes the available space and thus allows a relatively compact and space-saving design. 
     A cable outgoer panel is illustrated in this example, that is to say a switch panel for connection to a high-voltage cable. However, the described arrangement can also be used for switch panel types to which, for example, an overhead line, a transformer or the like can be connected. 
     In this case, corresponding components are provided instead of the high-voltage cables  81 ,  82 ,  83 , with the outgoer housing  71  being designed for connection of these components. 
       FIG. 2  shows a perspective illustration of a second cable outgoer panel of a switchgear assembly according to the invention. The second cable outgoer panel illustrated here is similar to the first cable outgoer panel as shown in  FIG. 1 , for which reason the differences will primarily be described here. Furthermore, features are described which can be seen better in this illustration. The control cabinet  35  is not shown in this illustration. 
     A respective extension tube  91 ,  92 ,  93  is provided for each phase between the circuit breakers  11 ,  12 ,  13  and the outgoer splitting module  32 . The first extension tube  91  is in this case connected to the fourth single-phase connecting flange  44  of the outgoer splitting module  32  and to the output flange  22  of the first circuit breaker  11 . The second extension tube  92  and the third extension tube  93  are connected in a similar manner to the second circuit breaker  12  and, respectively, to the third circuit breaker  13  and the outgoer splitting module  32 . 
     The outgoer splitting module  32  is therefore mounted on the extension tubes  91 ,  92 ,  93 , which themselves are mounted on the circuit breakers  11 ,  12 ,  13 , such that the single-phase connecting flanges  44 ,  45 ,  46  point downward. Expressed in other words, the outgoer splitting module  31  is arranged vertically on the circuit breakers  11 ,  12 ,  13 , with the extension tubes  91 ,  92 ,  93  being arranged between the circuit breakers  11 ,  12 ,  13  and the outgoer splitting module  32 . 
     The angle module  72  from  FIG. 1  is missing. By way of example, a voltage converter or a test adaptor for carrying out a high-voltage test can be connected to the three-phase connection flange  65  of the outgoer splitting module  32 , which is closed in the illustration shown. 
     The outgoer splitting module  32  has a three-phase output flange  68 , which points toward the rear face. The outgoer housing  71  is connected in a known manner to this output flange  68 . 
     A first drive box  94  is arranged on the first busbar housing  51 . This first drive box  94  contains the drives and indication elements for the isolators/grounding means which are located in the first busbar housing  51 . 
     A second drive box  95  is arranged at the front on the second busbar housing  52 . This second drive box  95  contains the drives and indication elements for the isolators/grounding means which are located in the second busbar housing  52 . 
     An outgoer drive box  97  is arranged at the side on the outgoer housing  71 . This outgoer drive box  97  contains the drives and indication elements for the isolators/grounding means which are located in the outgoer housing  71 . 
     Said drive boxes  94 ,  95 ,  97  are arranged such that they are relatively easily accessible and can be seen. 
       FIG. 3  shows a third cable outgoer panel of a switchgear assembly according to the invention. The third cable outgoer panel shown here is similar to the first cable outgoer panel shown in  FIG. 1 , for which reason the differences will primarily be described here. 
     A triple busbar splitting module  33  which is located on the circuit breakers has—in comparison to the busbar splitting module  31  shown in FIG.  1 —a further, third three-phase connecting flange  63 , which points toward the rear face and is therefore opposite the first three-phase connecting flange  61 . 
     A third busbar housing  53  is attached to the third three-phase connecting flange  63 . The third busbar housing  53  is therefore suspended at the rear on the triple busbar splitting module  33 . 
     The circuit breakers  11 ,  12 ,  13  have a greater axial extent than that shown in the illustration in  FIG. 1 , that is to say they are longer. Space for the third busbar housing  53  is therefore created between the triple busbar splitting module  33  and the outgoer splitting module  32 . 
     A gangway  101  is provided above the third busbar housing  53 , and rests on stilts  102 . An operator can access all the parts of the third busbar housing  53  and all the angle modules  72  of all the switch panels in the switchgear assembly via this gangway  101 , which extends parallel to the busbar housings  51 ,  52 ,  53 . 
     In general, current transformers are integrated in the busbar splitting module  31 , in the outgoer splitting module  32 , in the triple busbar splitting module  33 , and in the extension tubes  91 ,  92 ,  93 . The connecting boxes of these current transformers can likewise be accessed via the gangway  101 . 
     The gangway  101  therefore improves the accessibility to various components of the switchgear assembly. 
     The switchgear assembly shown here may, of course, also be designed without a gangway. 
     Furthermore, it is feasible for the third busbar and therefore the third busbar housing  53  to be omitted, as a result of which the cable outgoer panel is similar to that shown in  FIG. 1 . In this case, the gangway  101  may be arranged at a lower level, for example directly above the circuit breakers  11 ,  12 ,  13 . 
       FIG. 4  shows a front view of the first cable outgoer panel from  FIG. 1 . The first busbar housing  51  runs horizontally above the drives  14 ,  15 ,  16  of the circuit breakers  11 ,  12 ,  13 , which cannot be seen here. The second busbar housing  52  runs parallel to and above the first busbar housing  51 . 
     Instead of said cable outgoer panel, it is, of course, also possible to provide some other switch panel, for example a feed panel or an overhead-line outgoer panel. 
     Both busbar housings  51 ,  52  are partially concealed by the control cabinet  35 . The control cabinet  35  occupies only a part, for example half, of the width of the switch panel. The busbars are therefore accessible in the area at the side of the control cabinet  35 . In particular, the first drive box  94  of the first busbar housing  51  and the second drive box  95  of the second busbar housing  52  can be seen and are accessible. 
       FIG. 5  shows a side view of a quadruple busbar splitting module  110 . The quadruple busbar splitting module  110  has an cylindrical housing body  120 , whose circular end face can be seen in this illustration. As used herein, circular means approximately circular. 
     The quadruple busbar splitting module  110  is used for connection of three single-phase circuit breakers, which are not illustrated here, to up to four busbars, which are not illustrated here. 
     The quadruple busbar splitting module  110  for this purpose has four three-phase connecting flanges  161 ,  162 ,  163 ,  164  for connection of a respective busbar, and three single-phase connecting flanges  141 ,  142 ,  143  for connection of a respective single-phase circuit breaker. 
     The single-phase connecting flanges  141 ,  142 ,  143  are attached to a respective single-phase connecting stub  151 ,  152 ,  153 , which project in the radial direction from the cylindrical housing body  120  of the quadruple busbar splitting module  110 . 
     The three-phase connecting flanges  161 ,  162 ,  163 ,  164  are attached to a respective three-phase connecting stub  171 ,  172 ,  173 ,  174 , which likewise project in the radial direction from the cylindrical housing body  120  of the quadruple busbar splitting module  110 . 
     In this context, a single-phase connecting stub means a connecting stub through which a single phase conductor is passed. In this context, a three-phase connecting stub means a connecting stub through which three phase conductors of a three-phase system are passed. 
     The single-phase connecting stubs  151 ,  152 ,  153  are arranged on an envelope line of the cylindrical housing body  120 . 
     In the illustration shown, the second single-phase connecting flange  142 , which is attached to the second single-phase connecting stub  152 , as well as the third single-phase connecting flange  143 , which is attached to the third single-phase connecting stub  153 , are concealed by the first single-phase connecting flange  141 . In the illustration shown, the second single-phase connecting stub  152  and the third single-phase connecting stub  153  are likewise concealed by the first single-phase connecting stub  151 , to which the first single-phase connecting flange  141  is attached. 
     The three-phase connecting stubs  171 ,  172 ,  173 ,  174  are arranged on different envelope lines of the cylindrical housing body  120 . 
     The first three-phase connecting stub  171 , to which the first three-phase connecting flange  161  is attached, is in this case arranged on an envelope line which is offset through 90° in the clockwise sense in the circumferential direction with respect to the envelope line on which the single-phase connecting stubs  151 ,  152 ,  153  are arranged. 
     The second three-phase connecting stub  172 , to which the second three-phase connecting flange  162  is attached, is arranged on an envelope line which is offset through 150° in the clockwise sense in the circumferential direction with respect to the envelope line on which the single-phase connecting stubs  151 ,  152 ,  153  are arranged. 
     The third three-phase connecting stub  173 , to which the third three-phase connecting flange  163  is attached, is arranged on an envelope line which is offset through 210° in the clockwise sense in the circumferential direction with respect to the envelope line on which the single-phase connecting stubs  151 ,  152 ,  152  are arranged. 
     The fourth three-phase connecting stub  174 , to which the fourth three-phase connecting flange  164  is attached, is arranged on an envelope line which is offset through 270° in the clockwise sense in the circumferential direction with respect to the envelope line on which the single-phase connecting stubs  151 ,  152 ,  153  are arranged. 
     The first three-phase connecting stub  171  and the fourth three-phase connecting stub  174  are therefore arranged on envelope lines of the cylindrical housing body  120  which are diametrically opposite. The envelope lines on which mutually adjacent three-phase connecting stubs are arranged are each offset through 60° with respect to one another in the circumferential direction. 
     The three-phase connecting stubs  171 ,  172 ,  173 ,  174  are also arranged offset with respect to one another in the axial direction. The first three-phase connecting stub  171  and the third three-phase connecting stub  173  are arranged on a circumferential line in the axial direction. The second three-phase connecting stub  172  and the fourth three-phase connecting stub  174  are arranged on a circumferential line in the axial direction, with this circumferential line being arranged offset to the rear in the illustration shown with respect to the circumferential line on which the first three-phase connecting stub  171  and the third three-phase connecting stub  173  are arranged. 
     In the illustration shown, the second three-phase connecting stub  172  and the fourth three-phase connecting stub  174  as well as the second three-phase connecting flange  162  and the fourth three-phase connecting flange  164  are therefore partially concealed by the first three-phase connecting stub  171  and the third three-phase connecting stub  173 , as well as by the first three-phase connecting flange  161  and the third three-phase connecting flange  163 . 
     Busbar splitting modules with five or more three-phase connecting flanges for connection of five or more busbars are, of course, also feasible. It is also feasible for the three-phase connecting stubs to be offset through a different angle, for example 45°, with respect to one another in the circumferential direction. 
       FIG. 6  shows the quadruple busbar splitting module  110 , as explained in  FIG. 5 , with connected busbars. In this case, a first busbar housing  51  is connected to the first three-phase connecting flange  161 , a second busbar housing  52  is connected to the second three-phase connecting flange  162 , a third busbar housing  53  is connected to the third three-phase connecting flange  163 , and a fourth busbar housing  54  is connected to the fourth three-phase connecting flange  164 . 
       FIG. 7  shows a front view of the quadruple busbar splitting module  110  as explained in  FIG. 5 . 
     The first single-phase connecting stub  151 , the second single-phase connecting stub  152  and the third single-phase connecting stub  153  project in the same direction from the housing body  120  of the quadruple busbar splitting module  110 . The first single-phase connecting stub  141  is attached to the first single-phase connecting stub  151 , the second single-phase connecting flange  142  is attached to the second single-phase connecting stub  152 , and the third single-phase connecting flange  143  is attached to the third single-phase connecting stub  153 . 
     The first three-phase connecting stub  171 , which cannot be seen in this illustration, is arranged with the first three-phase connecting flange  161  offset through 90° in the circumferential direction on the cylindrical housing body  120 . The second three-phase connecting stub  172  with the second three-phase connecting flange  162  is arranged offset through a further 60° in the circumferential direction on the cylindrical housing body  120 . The third three-phase connecting stub  173  with the third three-phase connecting flange  163  is arranged offset through a further 60° in the circumferential direction on the cylindrical housing body  120 . The fourth three-phase connecting stub  174 , which is arranged offset through a further 60° in the circumferential direction on the cylindrical housing body  120 , as well as the associated fourth three-phase connecting flange  164 , are concealed by the housing body  120  in this illustration, and therefore cannot be seen. 
     The first three-phase connecting stub  171  is arranged offset in the axial direction with respect to the adjacent second three-phase connecting stub  172 . The third three-phase connecting stub  173  is likewise arranged offset in the axial direction with respect to the adjacent second three-phase connecting stub  172 . Furthermore, the fourth three-phase connecting stub  174  is arranged offset in the axial direction with respect to the adjacent third three-phase connecting stub  173 . 
     In this example, the first three-phase connecting stub  171  and the third three-phase connecting stub  173  as well as the second three-phase connecting stub  172  and the fourth three-phase connecting stub  174  are each located on the same circumferential line. It is also feasible for each of the three-phase connecting stubs to be arranged on their own circumferential line, as a result of which each of the three-phase connecting stubs is offset in the axial direction with respect to each of the other three-phase connecting stubs. 
     Isolators and grounding means which are arranged in the housings of the busbars in a known manner, are not illustrated here. The phase conductors are likewise not illustrated here. 
     LIST OF DESIGNATIONS 
     
       
         
               
               
             
           
               
                   
               
             
             
               
                 11 
                 First circuit breaker 
               
               
                 12 
                 Second circuit breaker 
               
               
                 13 
                 Third circuit breaker 
               
               
                 14 
                 First drive 
               
               
                 15 
                 Second drive 
               
               
                 16 
                 Third drive 
               
               
                 21 
                 Input flange of the first circuit breaker 
               
               
                 22 
                 Output flange of the first circuit breaker 
               
               
                 31 
                 Busbar splitting module 
               
               
                 32 
                 Outgoer splitting module 
               
               
                 33 
                 Triple busbar splitting module 
               
               
                 35 
                 Control cabinet 
               
               
                 41 
                 First single-phase connecting flange 
               
               
                 42 
                 Second single-phase connecting flange 
               
               
                 43 
                 Third single-phase connecting flange 
               
               
                 44 
                 Fourth single-phase connecting flange 
               
               
                 45 
                 Fifth single-phase connecting flange 
               
               
                 46 
                 Sixth single-phase connecting flange 
               
               
                 51 
                 First busbar housing 
               
               
                 52 
                 Second busbar housing 
               
               
                 53 
                 Third busbar housing 
               
               
                 54 
                 Fourth busbar housing 
               
               
                 61 
                 First three-phase connecting flange 
               
               
                 62 
                 Second three-phase connecting flange 
               
               
                 63 
                 Third three-phase connecting flange 
               
               
                 65 
                 Connection flange 
               
               
                 66 
                 Adaptor flange 
               
               
                 67 
                 Outgoer flange 
               
               
                 68 
                 Output flange 
               
               
                 71 
                 Outgoer housing 
               
               
                 72 
                 Angle module 
               
               
                 73 
                 Quick-action grounding means 
               
               
                 75 
                 Voltage converter 
               
               
                 81 
                 First high-voltage cable 
               
               
                 82 
                 Second high-voltage cable 
               
               
                 83 
                 Third high-voltage cable 
               
               
                 91 
                 First extension tube 
               
               
                 92 
                 Second extension tube 
               
               
                 93 
                 Third extension tube 
               
               
                 94 
                 First drive box 
               
               
                 95 
                 Second drive box 
               
               
                 97 
                 Outgoer drive box 
               
               
                 101 
                 Gangway 
               
               
                 102 
                 Stilt 
               
               
                 110 
                 Quadruple busbar splitting module 
               
               
                 120 
                 Housing body of the quadruple busbar splitting module 
               
               
                 141 
                 First single-phase connecting flange of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 142 
                 Second single-phase connecting flange of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 143 
                 Third single-phase connecting flange of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 151 
                 First single-phase connecting stub of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 152 
                 Second single-phase connecting stub of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 153 
                 Third single-phase connecting stub of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 161 
                 First three-phase connecting flange of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 162 
                 Second three-phase connecting flange of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 163 
                 Third three-phase connecting flange of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 164 
                 Fourth three-phase connecting flange of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 171 
                 First three-phase connecting stub of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 172 
                 Second three-phase connecting stub of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 173 
                 Third three-phase connecting stub of the quadruple busbar 
               
               
                   
                 splitting module 
               
               
                 174 
                 Fourth three-phase connecting stub of the quadruple busbar 
               
               
                   
                 splitting module