Abstract
An electric switching device contains a first contact piece and a second contact piece. The first contact piece can be driven by a first kinematic chain. The second contact piece can be driven by a second kinematic chain. The electric switching device contains a first switching point and a second switching point, which are electrically connected in series, the first contact piece being associated with the first switching point and the second contact piece with the second switching point.
Claims
1. An electric switching device, comprising: a first contact piece; a second contact piece; a first kinematic chain for driving said first contact piece; a second kinematic chain for driving of said second contact piece, said first kinematic chain and said second kinematic chain operate in a mutually independent mechanical arrangement independent from each other; a first switching point being associated with said first contact piece; and a second switching point connected in series with said first switching point, said second contact piece being associated with said second contact point.
2. The electric switching device according to claim 1, wherein: said first switching point is configured with a third contact piece and said first contact piece is moveable in relation to said third contact piece; and said second switching point is configured with a fourth contact piece, and said second contact piece is moveable in relation to said fourth contact piece.
3. The electric switching device according to claim 1, wherein said first contact piece and said second contact piece are disposed to move relatively to each other.
4. The electric switching device according to claim 1, further comprising: a first drive for driving said first kinematic chain; and a second drive for driving said second kinematic chain.
5. The electric switching device according to claim 1, wherein said first drive and said second drive are configured in a diametrically opposite arrangement to an axis of symmetry of the electric switching device.
6. The electric switching device according to claim 5, wherein opposing movements are communicated by said first and second kinematic chains to said first and second contact pieces.
7. The electric switching device according to claim 1, wherein said first and second kinematic chains are mechanically separated from each other, wherein movements of said first and second kinematic chains are synchronized.
8. The electric switching device according to claim 1, wherein said first and second switching points are effected by a connection of said first and second kinematic chains, respectively to said first and second contact pieces, respectively.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
(1) Hereinafter, one exemplary embodiment is schematically represented in a drawing and is then described in greater detail. Herein:
(2) FIG. 1 shows a side view of an electric switching device, with a partial cutaway;
(3) FIG. 2 shows an expanded section of the cutaway represented in FIG. 1;
(4) FIG. 3 shows an overhead view of the electric switching device represented in FIG. 1, with a partial cutaway;
(5) FIG. 4 shows an expanded view of the cutaway section of the electric switching device represented in FIG. 3, and
(6) FIG. 5 shows an end-on view of the electric switching device.
DESCRIPTION OF THE INVENTION
(7) FIG. 1 shows a side view of an electric switching device of dead tank design. The electric switching device is provided with a housing 1. The housing 1 encloses a first switching point 2 and a second switching point 3. In this case, the housing 1 is configured such that it hermetically encloses the two switching points 2, 3. The housing 1 acts as a fluid-tight barrier. The housing 1 comprises a cylindrical base component with a longitudinal axis 4. The housing 1 may be comprised of various materials or material combinations. In this case, the housing 1 is configured with a base component of a metallic material, which is at ground potential and essentially extends in a cylindrical arrangement with respect to the longitudinal axis 4. The housing 1 is also provided with a first exterior bushing 5 and a second exterior bushing 6. The two exterior bushings 5, 6 constitute electrically insulating sections of the housing 1, through which phase conductors 5a, 6a may be routed to the interior of the housing 1 in an electrically insulated arrangement. The phase conductors 5a, 5b pass through the barrier of the housing 1 in an electrically insulated arrangement, and penetrate the interior of the metallic base component of the housing 1. The phase conductors 5a, 5b are accommodated in the interior of the housing 1 in an electrically insulated arrangement. For the purposes of electrical insulation, the housing 1 is filled with an electrically insulating fluid. Suitable electrically insulating fluids include, for example, gaseous sulfur hexafluoride, gaseous nitrogen, gaseous carbon dioxide or mixtures of said gases. Optionally, the substances may also be present in the interior of the housing 1 in the liquid state. Alternatively, fluids such as insulating oils or insulating esters in liquid form may also be used. In order to increase the insulation withstand of the fluid, the latter may be subjected to overpressure. In this case, the housing 1 acts as a pressure vessel.
(8) In the interior of the housing 1, the two phase conductors 5a, 6a may be mutually electrically bonded or separated at the first switching point 2 and the second switching point 3. To this end, the two switching points 2, 3 are electrically connected in series via a central node point 7. On the central node point 7 of the electric switching device, a first contact piece 8 and a second contact piece 9 are, firstly, electrically bonded with the node point 7 and, secondly, are mounted to permit axial displacement relative to the node point 7. The two contact pieces 8, 9 are of identical design. Schematically, FIG. 1 shows that the first contact piece 8 and the second contact piece 9 are configured respectively in the form of studs, whereby the stud axes of the two contact pieces 8, 9 are arranged in the direction of the longitudinal axis 4, and the contact pieces 8, 9 are mounted to permit axial displacement on the central node point 7. The central node point 7 may, for example, be a metallic hollow body, mounted on a post insulator 10 fitted to the interior wall of the housing 1. Accordingly, the node point 7 is electrically insulated in relation to the housing 1, and consequently shows a floating electrical potential, i.e. the potential of the node point 7 varies according to the circuit state of the two switching points 3, 2.
(9) The first and second contact pieces 8, 9 are permanently bonded in a mutually electrically conductive arrangement via the second node point. For example, the contact pieces 8, 9 may be electrically bonded with the node point 7 by means of a sliding contact arrangement. On the first switching point 2, a third contact piece 11 is arranged opposite the first contact piece 8. Analogously, on the second switching point 3, a fourth contact piece 12 is arranged opposite the second contact piece 9. The third and fourth contact pieces 11, 12 are of diametrically opposite design to their associated respective first or second contact pieces 8, 9. In this case, the third contact piece 11 and the fourth contact piece 12 are configured as bushes, with which the relatively moveable contact piece 8 or the relatively moveable contact piece 9 are designed to engage, for the purposes of bonding. In this case, the third contact piece 11 and the fourth contact piece 12 are mounted in a stationary arrangement and are electrically insulated from the housing 1. The third contact piece 11 is provided with an electrically conductive bond to the phase conductor 5a of the first exterior bushing 5, and is bonded to the latter in a rigid angular arrangement. The fourth contact piece 12 is provided with an electrically conductive bond to the phase conductor 6a of the second exterior bushing 6, and is bonded to the latter in a rigid angular arrangement. The first switching point 2 and the second switching point 3 are arranged between the phase conductors 5a, 6a of the two exterior bushings 5, 6, whereby the two switching points 2, 3 (via the central node point 7) are electrically connected in series, such that a current path running via the phase conductors 5a, 6a of the exterior bushings 5, 6 may be closed or separated by means of the two switching points 2, 3.
(10) The post insulator 10 is a rotationally symmetrically hollow body, the first end of which is bonded to the node point 7, and the second end of which is supported on the inner shell side of the housing 1. By means of the post insulator 10, the node point 7 is maintained in proximity to other components which are fitted thereto, such as, for example, the first contact piece 8 and the second contact piece 9. A first kinematic chain 13 is provided for the movement of the first contact piece 8. A second kinematic chain 14 is provided for the movement of the second contact piece 9. The first kinematic chain 13 is provided with a first driving means 15. The second kinematic chain 14 is provided with a second driving means 16. The two driving means 15, 16 generate a movement, which is communicated to the first or second contact pieces 8, 9 respectively via the first or second kinematic chains 13, 14 respectively. In this case, the two driving means 15, 16 are of identical design, and are arranged on the outer shell side of the first housing 1. In this case, the two driving means 15, 16 are each configured as spring-loaded drive systems, i.e. each of the two driving means 15, 16 is provided with at least one storage spring, which is tensioned, and the energy of which is then delivered upon release and communicated to the first or second contact pieces 8, 9. The kinematic chains 13, 14 each penetrate the barrier of the housing 1 in a fluid-tight arrangement, such that the driving means 15, 16 are arranged outside the housing 1, and movement can be transmitted to the interior of the housing 1 through the wall of said housing 1, whereby the fluid-tightness of the housing 1 is maintained. For example, the kinematic chains 13, 14 may each be provided with a rotatable shaft, which penetrates a wall of the housing 1 and is sealed by means of a rotary seal. Sealing elements for the maintenance of leak-tightness in respect of axial movements may also be used, in order to permit the translation of a movement to the interior of the housing 1 by means of a linearly displaceable element of the kinematic chains 13, 14.
(11) FIG. 2 shows an enlargement of the partial cutaway section of the electric switching device represented in FIG. 1. The configuration of the first and second contact pieces 8, 9, and of the third and fourth contact pieces 11, 12, is represented schematically. However, the first and second, or the third and fourth contact pieces 8, 9, 11, 12 may also show a different construction. For example, separate rated current or arcing contact pieces may be assigned respectively to the contact pieces 8, 9, 11, 12, in order to permit the time-displaced closing of the rated current and arcing current paths at the first switching point 2 or the second switching point 3. In particular, the switching points 2, 3 may be configured in each case as a power switch which is designed for simple interruption. An electric switching device configured according to the invention can be configured independently of the actual configuration of the contact pieces 8, 9, 11, 12.
(12) FIG. 2 shows a detail of the kinematic chains 13, 14 known from FIG. 1. By way of an example, the design of the first kinematic chain 13 will firstly be described. The second kinematic chain 14 is configured with a diametrically opposite design. Sub-assemblies of equivalent function carry reference numbers with the additional letter a. The first kinematic chain 13 is provided with a first driving means 15. The first driving means 15 is designed to deliver a linear movement, which essentially runs in parallel to the longitudinal axis 4. By means of a first reversing lever 17, which is mounted in a stationary pivoting arrangement in relation the housing 1, this linear movement is displaced through 90, such that an initial linear movement delivered by the first driving means 15 in the direction of the longitudinal axis 4 is translated into a movement which essentially runs at right angles to the axis of movement of the movement delivered by the first driving means 15. By means of a coupling rod 18, which is routed in the interior of the post insulator 10, this movement is transmitted to the interior of the node point 7. A further reversing lever 19 is arranged in the interior of the node point 7, by means of which a linear movement of the coupling rod 18 is displaced through a further 90, and this translated movement can again run in the direction of the longitudinal axis 4. By this arrangement, the movement communicated to the first reversing lever 17 in the direction of the longitudinal axis runs in an opposite direction to the movement communicated by the further reversing lever 19, which also runs in the direction of the longitudinal axis 4. These two axes of movement are arranged with a lateral displacement between them, which is bridged by means of the coupling rod 18. The movement communicated by the further reversing lever 19 is communicated to the first contact piece 8, such that the first contact piece 8 can be moved in parallel to the longitudinal axis 4. In addition, the first contact piece 8 is mounted to permit axial movement on the node point 7. By means of the moveable mounting on the node point 7, an electrical bonding (e.g. by sliding contacts) of the first contact piece 8 with the node point 7 is also ensured. The second kinematic chain 14 is provided with a diametrically opposite design, whereby an axis of symmetry is essentially perpendicular to the longitudinal axis 4 (in side view). It is therefore possible for the two driving means 15, 16, acting in opposite directions, to deliver movement in the direction of the longitudinal axis 4, said movement being correspondingly displaced by means of reversing levers 17, 17a, transmitted via coupling rods 18, 18a and the movement is again displaced further displaced in the direction of the longitudinal axis 4 by means of further reversing levers 19, 19a, whereby the movement delivered by the driving means 15, 16 in the direction of the longitudinal axis 4 is respectively oriented in opposite directions, and the movements of the first and second contact pieces 8, 9 are aligned in opposition. Correspondingly, driven by the first kinematic chain 13, the first contact piece 8 can be moved in the opposite direction to the second contact piece 9, which is driven by the second kinematic chain 14. For the coupling of the kinematic chain in the interior of the housing 1, a shell-side cap 20 is arranged on the housing 1 in the area of attachment of the post insulator 10. Said cap 20 accommodates the fluid-tight penetration of the first or second kinematic chains 13, 14 into the interior of the housing 1.
(13) FIG. 3 shows an overhead view of the electric switching device represented in FIGS. 1 and 2. The housing 1 can be seen, the base component of which is essentially configured as a cylinder along the longitudinal axis 4, whereby the two exterior bushings 5, 6 can be seen in overhead view. A central cutaway is shown, which fully penetrates the shell surface of the housing, thereby permitting an overhead view of the first driving means 15 and the second driving means 16. FIG. 4 shows an enlargement of the cutaway from FIG. 3. The two driving means 15, 16 deliver a linear movement in the direction of the longitudinal axis 4, whereby the two driving means 15, 16 are configured in a diametrically opposite arrangement relative to an axis of symmetry. In overhead view, the axis of symmetry also runs transversely, in particular at 90, to the longitudinal axis 4. The axis of symmetry in side view and the axis of symmetry in overhead view enclose a plane which is essentially perpendicular to the longitudinal axis 4. The configuration of the two-armed reversing levers 17, 17a can be seen, the axially spaced arms of which are each mounted on a shaft, such that the shafts of each reversing lever 17, 17a are configured in a centrally pivoting arrangement. The two coupling rods 18, 18a of the first or second kinematic chains 13, 14 run perpendicularly to the drawing plane of FIG. 4, and are displaceable in the direction of this axis.
(14) FIG. 5 shows an end-on view of the housing 1, wherein the second driving means 16 is arranged to face the viewer of FIG. 5. The second exterior bushing 6 also faces the viewer. It will be seen that the housing 1 is provided with a base component of essentially circular cross-section, whereby both the driving means 15, 16 and the exterior bushings 5, 6 are arranged on the shell side. The exterior bushings 5, 6 and the driving means 15, 16 are configured in a diametrically opposite arrangement relative to the longitudinal axis 4.
