| Title of Invention | CONNECTING PIECE FOR FITTING TO A FUSE HOUSING |
|---|---|
| Abstract | The invention relates inter alia to a connecting piece (50) having an electrical conductor (60) for fitting to a housing wall (130) of a protection housing (2) for an electrical switchgear installation (1), and for the electrical conductor to be passed through the housing wall electrically, with the connecting piece having a connecting area (80) on the housing wall side, and having a further connecting area (90) at a distance from the connecting area on the housing wall side. The invention provides for the connecting area on the housing wall side to be designed to be symmetrical such that when the connecting piece is fitted to the housing wall, at least two different alignments of the connecting piece are possioble by rotation about an axis at right angles to the housing wall. |
| Full Text | Description Connecting piece for fitting to a fuse housing Compact gas-insulated switchgear assemblies are used to carry out switching and protective tasks in the electrical distribution system in power distribution, particularly at the medium-voltage level. Particularly in the field of secondary distribution with relatively low rated currents up to a maximum of 1250 A and short-circuit currents up to a maximum of 25 kA, switchgear assemblies are used in a block form which means that a plurality of switching functions, such as load-break switches, circuit breakers and transformer outgoers, are arranged in a single gas container, which is generally filled with sulfur hexafluoride. These block containers can be connected by means of a busbar, which is passed out of the gas container, to form a relatively large switchgear assembly comprising a plurality of switchboards. Switchboards with a single switching function can also be connected to one another by means of a busbar that is passed out. A distinction is therefore drawn in the case of these switchgear assemblies between assembly types which can be extended and those which cannot. In addition to the gas container, these switchgear assemblies normally comprise the described busbar, an area of the cable connection and, when using high-voltage/high-power fuses, a fuse area. The Siemens NX PLUS C switchgear assembly, for example, uses a fuse fitting which is located in the cable connection area for the transformer outgoer. The bushings for connection of the transformer cable are loceted underneath the fuses. The present invention relates to a connecting piece having an electrical conductor for fitting to a housing wall of a fuse housing of an electrical switchgear assembly and for electrical bushing of the electrical conductor through the housing wall. A connecting piece such as this is disclosed, for example, in European Patent Specification EP 0 517 295. Against the background of a connecting piece such as this, the invention is based on the object of specifying a connecting piece of particularly simple design, which provides a high level of flexibility for installation of the connecting piece in an electrical switchgear assembly. According to the invention, this object is achieved by a connecting piece having the features of claim 1. Advantageous refinements of the connecting piece are specified in dependent claims. Accordingly, the invention provides that the connecting area on the housing wall side is designed to be symmetrical such that, when the connecting piece is being fitted to a housing wall, at least two different alignments of the connecting piece are possible by rotation about an axis at right angles to the housing wall. One major advantage of the connecting piece according to the invention is that it allows very flexible fitting of the connecting piece, to be precise matched to the free space available in the electrical switchgear assembly. The at least two different alignment options which are provided according to the invention for installation of the connecting piece specifically make it possible to flexibly deviate from an initially intended installation position for the connecting piece and to select a different installation position if this different installation position is found to be more suitable in the specific case. According to one particularly preferred embodiment, the connecting area on the housing wall side is designed to be rotationally symmetrical and, when the connecting piece is being fitted to the housing wall, any desired alignment of the connecting piece is possiole by rotation about the axis at right angles to the housing wall. This variant allows even greater installation flexibility because virtually any number of positions of the connecting piece relative to the fuse housing are possible. A particularly simple and low-cost design is achieved for the connecting piece if the connecting area has a flange area composed of electrically ;.nsulating material for an annular sealing washer to rest on, and if at its conductor end on the housing wall side, the electrical conductor has a bolt which projects from the flange area and has an internal or external thread, for example for holding an attachment screw or attachment nut. The bolt is preferably arranged centrally in the flange area and is of such a size that the annular sealing washer can be plugged onto the bolt. The connecting piece preferably has an attachment area between its connecting area on the housing wall side and its further connecting area, which attachment area allows the connecting piece to be attached by an (external) attachment means which is arranged outside the fuse housing. An attachment area such as this may, for example, have a groove which is arranged in an annular shape, at least in a ring section, around the electrical conductor. By way of example, an attachment ring or attachment ring segment may be inserted in this groove and its internal ring area facing the electrical conductor has a curved surface. The attachment ring or the attachment ring segment is preferably electrically conductive, and the radius of curvature of the curved surface in the internal ring area is preferably at least 1 mm. This is because an embodiment of the attachment ring or segment such as this makes it very simple to achieve electrical shielding between the electrical conductor of the connecting piece and the external attachment means, on the other hand. For example, such shielding makes it possible to avoid the possibility of an electrical field strength increase in the area of the groove, causing premature material ageing of the insulation material; this effect will be explained in more detail further below ir conjunction with the exemplary embodiments. The attachment ring or the attachment ring segment particularly preferably has a U-shaped cross section, with the bottom area of the U-shaped cross section facing the electrical conductor, and with the opening area of the U-shaped cross section facing away from the electrical conductor. The connecting piece may also contain an electrode, which forms a component of a capacit;.ve voltage divider. For example, a capacitive voltage divider such as this has a conductive ring electrode and non-conductive connection elements which are connected to it and are connected to the attachment ring or the attachment ring segment. The attachment ring or the attachment ring segment preferably has at least one connecting section with a hole into which one of the non-conductive connection elements is inserted. The at least one hole and the non-conductive connection elements are, for example, encapsulated in an insulation material of the connecting piece. The electrode of the capacitive voltage divider is physically preferably arranged between the groove and the electrical conductor so that it electrically shields the groove from the electrical conductor. The electrical conductor of the connecting piece may, for example, be straight or may be bent one or more times at any desired angle. The invention also relates; to a fuse housing, in particular a fuse fitting, for an eLectrical switchgear assembly with connecting bushings, at least one of which is equipped with a connecting piece as has been described above. Furthermore, the invention also relates to an electrical switchgear assembly having a fuse housing, in particular a fuse fitting, with connecting bushings, at least one of which is equipped with a connecting piece as described above. A switchgear assembly such as this preferably has three connecting bushings specifically a connecting bush on the outgoer-side, to which a connecting piece - as described above - is connected, as well as a front and a rear connecting bushing for connection to an assembly container of the switchgear assembly. The front or the rear connecting bushing is preferably electrically connected to the outgoer-side connecting bushing by means of a busbar. By way of example, the front or the rear connecting bushing may be fitted with a grounding contact of a grounding switch. The invention also relates to a method for production of a connecting piece, as has been described above, wherein, in the case of the method, an acapter piece is fitted to the other conductor end, facing away from the conductor end on the housing wall side, of the electrical conductor, and the electrical conductor together with the adapter piece is encapsulated with the insulation material of the connecting piece. The invention will be explained in more detail in the following text with reference to exemplary embodiments; in this case, by way of example: figure 1 shows one exemplary embodiment of an electrical switchgear assembly with a fuse fitting and a connecting piece, figures 2-5 show a first exemplary embodiment of a connecting piece according to the invention for the switchgear assembly as shown in figure 1, with the ccnnecting piece having a 90° bend and an attachment ring, figures 6-9 show a second exemplary embodiment of a connecting piece according to the invention, in which the electrical conductor of the connecting piece is not bent, figures 10-13 show a third exemplary embodiment of a connecting piece according to the invention, in which an attachment area is formed by a groove which is shielded by a capacitive voltage divider from the electrical conductor of the connecting piece, and figures 14-15 show a fourth exemplary embodiment of a connecting piece according to the invention, in which an adapter piece is encapsulated in an encapsulation material of the connecting piece. For the sake of clarity, the same reference symbols are always used for identical or comparable components in the figures. Figure 1 shows an electrical switchgear assembly 1 having a fuse housing in the form cf a fuse fitting 2, which is equipped with a fuse 3. The fuse fitting 2 has three connecting bushings, specifically an outgoer-side connecting bushing 4, a front connecting bushing 5 and a rear connecting bushing 6. The rear connecting bushing 6 is connected to the outgoer-side connecting bushing 4 by means of a busbar 7. An assembly container 8 is located above the fuse fitting 2 and, for example, is encapsulated and is filled with a gas, such as SF6 gas. A cable connecting area 9 is located underneath the fuse fitting 2. A multiplicity of electrical components are located in or on the assembly container 8, for example switching elements 10, 10' and 10" as well as further elements such as a mechanical drive for the switching device, which is arranged outside the assembly container, a mounting plate 11 for the switching device, and grounding contacts 14 with a mounting plate. An electrical connection is made between the components 10, 10', 10", 11, 13 and 14 and the fuse fitting 2 and/or the cable connecting area 9 via rail systems 15 which are connected via electrical bushings 20 to the front connecting bushing 5 and to the rear connecting bushing 6. As can also be seen from figure 1, a switchable connecting 16 within the assembly container 8 can be connected via a switching contact 17 to the rear connecting bushing 6, in such a way as to allow a connecting cable to be grounded in the cable connecting area 9, and a connection of the fuse fitting 2 to be grounded within the assembly container 8. Figure 1 also shows a closjre cover 30, which covers the fuse housing or the fuse fitting 2, and to which the fuse 3 is fitted. As can also be seen from figure 1, a connecting piece which can be mounted "flexibly" is connected to the outgoer-side connecting bushing 4. Figures 2 to 15 illustrate exemplary embodiments of the connecting piece 50 which can be mounted flexibly. Figures 2 to 4 show a first exemplary embodiment of the connecting piece 50 as shown in figure 1. These figures show an electrical conductor 60 which has a 90° bend and is encapsulated in an insulation material 70 of the connecting piece 50. The connecting piece 50 has a connecting area 80 on the housing wall side and a further connecting area 90, which is at a distance from the connecting area 80 on the housing wall side and is separated by the 90° bend area. The connecting area 80 on the housing wall side comprises a flange area 100 composed cf electrically insulating material, which is formed by the insulation material 70. The flange area 100 is shaped so as to allow it to rest on an annular sealing washer 110. A bolt 120 is also provided for fixing the annular sealing washer 110, which bolt 120 is formed by one end of the electrical conductor 60 and is arranged at right angles, at least approximately at right angles, to the surface of the flange area 100 and thus at right angles, at least approximately at right angles to the annular sealing washer 110. The bolt 120 has an internal thread 125 into which an attachment screw, which is not illustrated in any more detail, can be screwed. An attachment screw such as this allows the bolt 120 to be firmly screwed to one housing wall 130 of the fuse housing 2 of the electrical switchgear assembly 1, which is not illustrated in any more detail in figure 2. Specifically, when an attachment screw is screwed into the internal thread 125, then the bolt 120 in figure 2 is drawn upwards, as a result of which the flange area 100 of the connecting piece 50 and the annular sealing washer 110 are pressed from the outside against the housing wall 130 of the fuse housing 2, thus producing a sealed joint oetween the connecting piece 50 and the housing wall 130. As can be seen in figure 2, the symmetrical arrangement of the bolt 120 relative to the flange area 100 leads to the housing- side connecting area 80 being rotationally symmetrical, thus allowing the connecting piece to be fitted in any desired alignment to the housing wall 130, specifically because the connecting piece 50 can be rotated about the rotation axis which is formed by the bolt 120. In the exemplary embodiment shown in figure 2, any desired rotation angle ω is possible between the connecting piece 50 and the housing wall 130. Alternatively, it is also possible to allow only selected connecting angles co between the connecting piece 50 and the housing wall 130, for example by means of appropriate shaping (for example a polygonal cross section: square, triangular, polygonal) of the bolt 120 and/or of the housing wall opening into which the bolt 120 is inserted for fitting. As can also be seen in figure 2, the annular sealing washer 110 is of such a size that it can be plugged onto the bolt 120. The internal hole of the sealing washer 110 is preferably of such a size that it matches the external diameter of the bolt 120 as well as possible in order to prevent the sealing washer 110 from sliding on the flange area 100. As can also be seen from figure 2, an attachment area 160, which has a groove 170, is; arranged between the connecting area 80 on the housing wall side and the further connecting area 90. An attachment ring 18 0, which is U-shaped when viewed in the form of a cross section, is inserted or encapsulatec in the groove 170. The bottom area 190 of the U-shaped attachment ring 180 faces the electrical conductor 60 of the connecting piece. The bottom area 190 thus forms an internal annular area with a curved surface, which encloses the electrical conductor 60 of the connecting piece 50. Furthermore, when viewed in the form of a cross section, the attachment ring 180 has an opening area 200 which faces away from the electrical conductor 60 and is externally accessible. An external attachment means 210, for example in the form of a mounting wall, can be inserted into the opening area 200 of the attachment ring 180 in orcer to fix the connecting piece 50 in three dimensions. It is thus possible to attach the connecting piece outside the area of the housing wall 130 as well, and, for example, to prevent the possibility of the connecting piece 50 still pivoting about the rotation axis that is formed by the bolt 120, after the fitting process has been completed. The attachment ring 180 is preferably composed of an electrically conductive material in order that the formation of electrical field lines between the attachment ring 180 and the electrical conductor 60 during operation of the electrical conductor is determined exclusively by the shape of the attachment ring 180, and not by the shape of the edges of the attachment means 210 may be designed with sharp edges and, because of this shape, could cause an increase in the electrical field strength in the attachment area 160 of the connecting piece. The electrically conductive attachment ring 180 therefore also has the function of shielding the attachment means 210 from the electrical conductor 60. The curved surface, facing the electrical conductor 60, of the internal ring area and the bottom area 190 of the attachment ring 180 preferably have a radius of curvature of at least 1 mm. A radius of curvature such as this very reliably prevents the possibility of excessive field-line peaks in the area of the attachment ring 180, and premature ageing of the insulation material 70 resulting from an increased field strength. As can also be seen from figure 2, a capacitive voltage divider 250 is arranged in the connecting piece 50. The capacitive voltage divider 250 has a conductive ring electrode 260 and non-conductive connection elements 270 (cf. figure 3) which are connected to the attachment ring 180. The connection between the non-conductive connection elements 27 0 and the attachment ring 180 is not shown in figure 2, and will be explained further below in conjunction with figure 3. In addition, the capacitive voltage divider is equipped with an electrical measurement connection 280 which is connected to the conductive ring electrode 260 and allows capacitive voltage measurement of the electrical voltage on the electrical conductor 60. In order to allow an electrical connection to the electrical conductor 60 in the area of the further connecting area 90, the electrical conductor 60 is in the form of a plug socket 310 at its other conductor end 3 00 facing way from the conductor end 290 on the housing wall side, in such a way that a plug element can be inserted or screwed into the plug socket from the outside. Once again, figure 3 shows, in detail, the individual components of the connecting piece 50 shown in figure 2. This shows the electrical conductor 60 with its 90° bend area, which is indicated schematically by the angle a in figure 3. Furthermore, figure 3 shows the capacitive voltage divider 250 with its conductive ring electrode 260 and the non-conductive connection elements 270 connected to it. The non-conductive connection elements 270 are inserted into holes 350 in the attachment ring 180. For this purpose, the attachment ring 180 is equipped with three cor.necting sections 360, which are each provided with a hole 350 in order that in each case one of the non-conductive three connection elements 270 can be inserted into this. The insulation material 70 on the connecting piece 50 is formed by an encapsulation material, in which the electrical conductor 60 as well as the attachment ring 180 with the capacitive voltage divider 250 are encapsulated. In order to produce the connecting piece, the attachment ring 180 and the capacitive voltage divider 250 are first of all connected to one another by inserting the three non-conductive connection elements 270 into the three holes 350 in the connecting sections 360 of the attachment ring 180. In this case, no electrical connection is made between the attachment ring 180 and the electrically conductive ring electrode 260, since the connection elements 270 are not themselves Conductive. The plugged-together unit comprising the attachment ring 180 and the capacitive voltage divider 250 is then encapsulated together with the electrical conductor 60, in a casting mold which is not illustrated in any more detail, with the insulation material or casting material 70, thus forming the complete connecting piece 50. Once again, figures 4 and 5 show other illustrations of the connecting piece 50 as shown in figures 2 and 3. In this case, figure 4 shows a side view of the connecting piece, and figure 5 shows a three-dimensional view of the connecting piece, obliquely from the side. Figures 6 to 9 show a second exemplary embodiment of a connecting piece 50 as shown in figure 1. This connecting piece 50 differs from the first exemplary embodiment shown in figures 2 to 5 in the shape of the electrical conductor 60. In the second exemplary embodiment as shown in figures 6 to 9, the electrical conductor is designed to be straight, and not bent; otherwise, the technical design of the connecting piece corresponds essentially tc the first exemplary embodiment: the connecting piece 50 according to the second exemplary embodiment is therefore also equipped with a connecting area 80 on the housing wall side, whose flange area 100 is suitable for resting on an annular sealing washer, which is not illustrated in any more detail. The conductor end 290 of the electrical conductor 60 is once again equipped with an internal thread 125, thus allowing screw attachment of the connecting area 80 on the housing wall side to a housing wall of a fuse housing. An attachment ring 180 is arranged between the connecting area 80 on the housing wall side and the further connecting area 90, and allows the connecting piece 50 to be attached to attachment means 210, which are not illustrated in any more detail, for example a mounting wall. A capacitive voltage divider 250 has a conductive ring electrode 260 as well as non-conductive connection elements 270, which are plugged into connection sections 360 of an attachment ring 180 (cf. figure 7). The connection between the attachment ring 180 and the conductive ring electrode 260 is illustrated in detail in figure 7, which shows the individual parts of the connecting p.Lece 50 as shown in figure 6 in more detail. The capacitive voltage divider 250 as well as the attachment ring 180 of the connecting piece 50 as shown in figure 6 may, for example, be identical to the corresponding parts of the connecting piece 50 shown in figure 3. Figures 8 and 9 once again shown different views of the connecting piece 50 shown in figure 6. Figure 8 shows a side view of the connecting piece, and figure 9 shows a three- dimensional view, obliquely from the side. A third exemplary embodiment of a connecting piece 50 as shown in figure 1 is shown in figures 10 to 13. In contrast to the first two exemplary embodiments, this third exemplary embodiment has no attachment ring 180. Instead of this, the attachment area 160 is formed solely by the attachment groove 17 0, into which an attachment means 210, for example in the form of a mounting wall, can be inserted. If the attachment means 210 were now to be composed of an electrically conductive material,, then, if the surface of the attachment means 210 were to have sharply pronounced edges, this could lead to an increase in the field strength in the area of the edges of the attachment means 210, to be precise, also in the air gap 175 which necessarily occurs between the attachment means 210 and the insulation material 70; this is illustrated schematically by field lines F in figure 10. The electrical field lines would be formed if a high electrical voltage relative to the attachment means 210, which is normally at ground potential, were to be applied to the electrical conductor 60 of the connecting piece 50. In order to avoid the formation of field lines F as illustrated in figure 10, the capacitive voltage divider 250 in the exemplary embodiment shown in figure 10 is designed differently and is also arranged differently, to be precise in such a manner that a conductive ring electrode 400 of the capacitive voltage divider 250 is physically arranged between the electrical conductor 60 and the attachment groove 170 or the attachment area 160. This arrangement of the electrode 400 results in electrical shielding between the electrical conductor 60 and the attachment means 210, in such a way that the field lines F as illustrated in figure 10 do not occur in this form, specifically because the field lines, stating from the electrical conductor 6 3, will end at the electrode 400 and therefore cannot penetrate into the area of the edges of the attachment means 210, so :hat no field strength increase can occur either in the air gap 175. That section of the attachment means 210 which is located in the attachment groove 170 will therefore remain essentially free of field lines, because of the positioning of the electrode 400. Apart from this, that is to say by way of example with respect to the design of the connecting area 80 on the housing wall side, the shape of the flange area 100 and the design of the plug socket 310 in the further connecting area 90, the design of the connecting piece 50 as shown in figure 10 may, for example, correspond to the first exemplary embodiment as shown in figure 2. Figure 11 once again shows the components of the connecting piece 50 as shown in figure 10, :.n detail. As can be seen, the electrode 400 has an annular shape and is encapsulated in the insulation material 70, concentrically around the electrical conductor. The measurement connection 280, which is connected to the electrode 400, in order to allow electrical contact to be made with the electrode 400, can also be seen. Figure 12 shows the third exemplary embodiment, once again in the form of a view from the side, and figure 13 shows a three- dimensional view, obliquely from the side. A fourth exemplary embodiment of a connecting piece 50 as shown in figure 1 will now be explained in conjunction with figures 14 and 15. Figure 14 shows a connecting piece which corresponds essentially to the connecting piece 50 shown in figures 2 and 3. In contrast to this first exemplary embodiment, in the case of the fourth exemplary embodiment, an adapter piece 420 is also provided during the encapsulation of the electrical conductor 60, of the capacitive voltage divider 250 and of the attachment ring 180 with the encapsulation or insulation material 70. This adapter piece 420 is plugged or screwed into the plug socket 310 at the conductor end 300 before said components 60, 250, 180 and 420 are encapsulated with the insulation material 70. The leads to the adapter piece 420 being completely integrated in the connecting piece 50. The purpose of the adapter piece 420 is to allow the plug of the adapter piece 50 to be matched to other plug standards than that of the plug socket 310. The adapter piece 420 is therefore always placed on or inserted into the plug socket 310 durirg the production of the connecting piece 50 when it is found, even before production of the connecting piece 50, that a different plug standard will be used at the user end than that which would be provided by the plug socket 310 itself. The provision of the adapter piece 420, as already envisaged during the production of the connecting piece 50, and the encapsulation of the adapter piece 420 in the insulation material 70 ensure that a mechanically and electrically reliable connection is possible for other plug standards to the connecting piece 50 than would be made possible just by the plug socket 310 on its own. The provision of the adapter piece 420 during the production of the connecting piece itself increases the flexibility and reduces the costs for matching the connecting piece 50 to connection standards which are predetermined at the user end. Figure 15 shows the fourth exemplary embodiment, as shown in figure 14, with the integrated or encapsulated adapter piece 420, once again in the form of a three-dimensional view obliquely from the side. As can be seen, the plug connecting area which is formed by the adapter piece 420 is designed and shaped differently to that in the case of the plug socket 310 according to the first of the exemplary embodiments, as shown in figures 2 to 13. Reference Symbols 1 Switchgear assembly 2 Fuse housing or fitting 3 Fuse 4 Connecting bushing 5 Front connecting bushing 6 Rear connecting bushing 7 Busbar 8 Assembly container 9 Cable connection area 10,10', 10" Switching elements 11,13,14 Further elements 15 Rail systems 16 Switchable connection 17 Switching contact 20 Electrical bushings 30 Closure cover 50 Connecting piece 60 Conductor 70 Insulation naterial 80 Connecting area 90 Connecting area 100 Flange area 110 Sealing washer 120 Bolt 125 Internal thread 130 Housing wall 160 Attachment area 170 Groove 175 Air gap 180 Attachment ring 190 Bottom area 200 Opening area 210 Attachment neans 250 Voltage divider 260 Ring electrode 270 Connection element 280 Measurement connection 290,300 Conductor end 310 Plug socket 350 Hole 360 Connection sections 400 Ring electrode 420 Adapter piece Patent Claims 1. A connecting piece (50) having an electrical conductor (60) for fitting to a housing wall (130) of a fuse housing (2) of an electrical switchgear assembly (1) and for electrical bushing of the electrical conductor through the housing wall, with the connecting piece having at connecting area (80) on the housing wall side and a further connecting area (90) which is at a distance from the connecting area on the housing wall side, characterized in that the connecting area on the housing wall side is designed to be symmetrical such that, when the connecting piece is being fitted to the housing wall, at least two different alignments of the connecting piece are possible by rotation about an axis at right angles to the housing wall. 2. The connecting piece as claimed in claim 1, characterized in that the connecting area on the housing wall side is designed to be rotationally symmetrical and, when the connecting piece is being fitted to the housing wall, any desired alignment of the connecting piece is possible by rotation about the axis at right angles to the housing wall. 3. The connecting piece as claimed in one of the preceding claims, characterized in that the connecting area has a flange area (100) composed of electrically insulating material for an annular sealing washer (110) to rest on, and at its conductor end on the housing wall side, the electrical conductor has a bolt (120) which projects from the flange area and has a thread (125). 4. The connecting piece as claimed in claim 3, characterized in that the bolt is arranged centrally in the flange area and is of such a size that the annula.: sealing washer can be plugged onto the bolt. 5. The connecting piece as claimed in one of the preceding claims, characterized in that the connecting piece has an attachment area (160) between its connecting area on the housing wall side and its further connecting area, which attachment area (160) allows the connecting piece to be attached by an attachment means (210) which is arranged outside the fuse housing. 6. The connecting piece as claimed in claim 5, characterized in that the attachment area has a groove (170) which is arranged in an annular shape, at least in a ring section, around the electrical conductor. 7. The connecting piece as claimed in claim 6, characterized in that an attachment ring (180) or attachment ring segment is inserted in the groove and its internal ring area facing the electrical conductor has a curved surface. 8. The connecting piece as claimed in claim 7, characterized in that the radius of curvature of the curved surface in the internal ring area is at least 1 mm. 9. The connecting piece as claimed in one of the preceding claims 7-8, characterized in that the attachment ring or the attachment ring segment has a U- shaped cross section, with the bottom area (190) of the U- shaped cross section facing the electrical conductor, and with the opening area (200) of the U-shaped cross section facing away from the electrical conductor. 10. The connecting piece as claimed in one of the preceding claims 6-9, characterized in that the connecting piece contains an electrode (260) of a capacitive voltage divider (250). 11. The connecting piece as claimed in claim 10, characterized in that the capacitive voltage divider has a conductive ring electrode (260) and non-conductive connection elements (270) which are connected to it and are cor.nected to the attachment ring or to the attachment ring segment. 12. The connecting piece as claimed in claim 11, characterized in that the attachment ring or the attachment ring segment has at least one connecting section (360) with a hole (350) into which one of the non-conductive connection elements is inserted. 13. The connecting piece as claimed in claim 12, characterized in that the at least one hole and the non-conductive connection elements are encapsulated in an insulation material (70) of the connecting piece. 14. The connecting piece as claimed in one of the preceding claims 6-13, characterized in that the electrode (400) of the capacitive voltage divider is physically arranged betweesn the groove and the electrical conductor and electrically shields the electrical conductor from the groove. 15. The connecting piece as claimed in one of the preceding claims 7-14, characterized in that the attachment ring or the attachment ring segment is electrically conductive. 16. The connecting piece as claimed in one of the preceding claims, characterized in that the electrical conductor of the connecting piece is straight. 17. The connecting piece as claimed in one of the preceding claims, characterized in that the electrical conductor of the connecting piece is bent through 90°. 18. A fuse housing, in particular a fuse fitting, for an electrical switchgear assembly (1) with connecting bushings (4, 5, 6) , at least one of which is equipped with a connecting piece as claimed in one of the preceding claims. 19. An electrical switchgear assembly (1) having a fuse housing, in particular a fuse fitting, with connecting bushings (4, 5, 6), at least one of which is equipped with a connecting piece as claimed in one of the preceding claims 1-17. 20. The electrical switchgsar assembly as claimed in claim 19, characterized in that the fuse housing has three connecting bushings (4, 5, 6), specifically a connecting bushing (4) on the outgoer-side, to which a connecting piece as claimed in one of the claims is connected, as well as a front and a rear connecting bushing for connection to an assembly container of the switchgear assembly. 21. The electrical switchcear assembly as claimed in claim 20, characterized in that the front or the rear connecting bushing is electrically connected to the outgoer-side connecting bushing by means of a busbar (7). 22. The electrical switchgear assembly as claimed in claim 21, characterized in that the front or the rear connecting bushing is fitted with a grounding contact of a groanding switch. 23. A method for production of a connecting piece as claimed in one of the preceding claims 1-17, wherein, in the case of the method, an adapter piece (420) is fitted to the other conductor end (300), facing away from the conductor end (290) on the housing wall side, of the electrical conductor, and the electrical conduct or together with the adapter piece (420) is encapsulated with an insulation material of the connecting piece. The invention relates inter alia to a connecting piece (50) having an electrical conductor (60) for fitting to a housing wall (130) of a protection housing (2) for an electrical switchgear installation (1), and for the electrical conductor to be passed through the housing wall electrically, with the connecting piece having a connecting area (80) on the housing wall side, and having a further connecting area (90) at a distance from the connecting area on the housing wall side. The invention provides for the connecting area on the housing wall side to be designed to be symmetrical such that when the connecting piece is fitted to the housing wall, at least two different alignments of the connecting piece are possioble by rotation about an axis at right angles to the housing wall. |
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| Patent Number | 270248 | ||||||||||||
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| Indian Patent Application Number | 357/KOLNP/2009 | ||||||||||||
| PG Journal Number | 49/2015 | ||||||||||||
| Publication Date | 04-Dec-2015 | ||||||||||||
| Grant Date | 04-Dec-2015 | ||||||||||||
| Date of Filing | 27-Jan-2009 | ||||||||||||
| Name of Patentee | SIEMENS AKTIENGESELLSCHAFT | ||||||||||||
| Applicant Address | WITTELSBACHERPLATZ 2, 80333 MUNCHEN | ||||||||||||
Inventors:
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| PCT International Classification Number | H01B 17/26 | ||||||||||||
| PCT International Application Number | PCT/EP2007/006191 | ||||||||||||
| PCT International Filing date | 2007-07-09 | ||||||||||||
PCT Conventions:
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