Abstract
A current interrupter system has a series arrangement of at least two interrupter units. At least one of the interrupter units is a vacuum tube, and the at least two interrupter units are mechanically connected to a drive system. The drive system has a drive assembly and a drive shaft. The drive shaft is a crank shaft equipped with at least two cranks. The at least two cranks have two crank strokes of different magnitudes.
Claims
1-10. (canceled)
11. A current interrupter system, comprising: a series arrangement of at least two interrupter units; at least one of said interrupter units being a vacuum tube; a drive system mechanically connected to said at least two interrupter units, said drive system including a drive assembly and a drive shaft; said drive shaft being a crank shaft with at least two cranks having two crank strokes of mutually different magnitudes.
12. The current interrupter system according to claim 11, wherein said crank shaft is configured to carry out a unidirectional rotational movement during an opening operation of said interrupter units.
13. The current interrupter system according to claim 12, wherein said crank shaft is configured for a unidirectional rotational movement of between 170° and 190° during the opening operation of the interrupter units.
14. The current interrupter system according to claim 12, wherein said crank shaft is configured for a unidirectional rotational movement of substantially 180° during the opening of the interrupter units.
15. The current interrupter system according to claim 11, wherein said crank shaft is configured to carry out a unidirectional rotational movement of between 350° and 360°+10° during an opening operation and a following closing operation of said interrupter units.
16. The current interrupter system according to claim 11, wherein said at least two interrupter units are connected electrically in series with one another and mechanically connected to a respective crank having different crank strokes, and wherein said at least two interrupter units have different rated voltages.
17. The current interrupter system according to claim 16, wherein three identical pairs of said interrupter units that are connected in series are mechanically connected to said crank shaft.
18. The current interrupter system according to claim 16, further comprising a crank pin forming a mechanical connection between said crank shaft and a respective said interrupter unit, said crank pin being arranged between two cranks at a distance from an axis of rotation of said crank shaft, and a plain bearing surrounding said crank pin and being connected to a push rod.
19. The current interrupter system according to claim 18, wherein said push rod is mechanically connected to a contact bolt.
20. The current interrupter system according to claim 19, which comprises a further plain bearing forming a mechanical connection between said push rod and said contact bolt.
21. The current interrupter system according to claim 11, wherein a radial orientation of the crank stroke of two mutually adjacent cranks along said crank shaft is offset by 180°.
Description
[0017] Further embodiments and further features of the invention will be explained in more detail with reference to the figures below. These are purely schematic illustrations which do not signify any restriction of the scope of protection. Features which have the same designation in different embodiments are provided here with the same reference sign which may be identified with an additional prime.
[0018] In the figures:
[0019] FIG. 1 shows a current interrupter system with a drive unit and two different interrupter units in the form of vacuum interrupters,
[0020] FIG. 2 shows the current interrupter system according to FIG. 1 in an open state,
[0021] FIG. 3 shows a cross section through a crank shaft of the drive system in the region of a crank pin,
[0022] FIG. 4 shows a schematic illustration of a current interrupter system with in each case two interrupter units which are connected in series for three phases, with a total of six interrupter units,
[0023] FIG. 5 shows an analogous schematic illustration as in FIG. 4 with interrupter units arranged offset with respect to a line and with crank strokes in radially different directions.
[0024] FIG. 1 illustrates a current interrupter system 2 which has a drive system 8 which jointly drives two different interrupter units 4 and 6. The drive system 8 here comprises a drive assembly 9 and a crank shaft 10. In this embodiment, the crank shaft 10 is mounted by way of example on two crank shaft bearings 34 and carries out a unidirectional rotational movement along the arrow 20. The crank shaft 10 here has two cranks 12 and 14 which each have a different crank stroke 18 and 16. The term crank 12 is also understood here as meaning a pair of cranks 12 and 12′ or 14 and 14′, between which a crank pin 24 is arranged. The crank pin 24 runs here parallel to an axis of rotation 26 of the crank shaft 10. During a rotational movement 20, the crank pin 24 here describes a circular movement about the axis of rotation 26. Plain bearings 28 are in turn attached to the crank pins 24 and are connected to a push rod 30. A further plain bearing 50 is arranged in turn at the end of the push rod 30 and is connected to a contact bolt 32 of the interrupter unit.
[0025] The interrupter units 4, 6 here have a contact system 36 which comprise two contacts, a moving contact 38 and a fixed contact 40. The contact system 36 is arranged in a vacuum chamber 44 surrounded by a housing 42. The illustration according to FIGS. 1 and 2 can be seen purely schematically, and details of the interrupter units 4, 6, which are configured in the form of vacuum interrupters, are not illustrated here. The moving contact 38 is connected here to the contact bolt 32 which has already been mentioned, wherein, during a translational movement of the contact bolt 32, the contact system 36 is opened, as is illustrated in FIG. 2. By means of the rotational movement 20 of the crank shaft 10 is transmitted by the push rod 30, which is configured in the form of a connecting rod, and converted into a translational movement of the contact bolt 32 and therefore of the moving contact 38. This kinematic sequence applies equally to both interrupter units 4, 6. The difference between the sequence during the opening of the contact systems 36 and 36′ consists, according to this illustration, in that the crank stroke 18 for the smaller interrupter unit 6 turns out to be smaller than the crank stroke 16 for the larger interrupter unit 4. In this way, different interrupter units 4, 6 which have different rated voltages and are connected serially to each other can be operated with one drive system 8.
[0026] The series connection of the two interrupter units 4, 6 is produced by a contact connection via bus bars 48, which are electrically connected to a flexible current connector 46, which in turn makes contact with the contact bolt 50. A further connection via bus bars 48 and current connectors 46 furthermore takes place via the fixed contact 40 and a bolt assigned thereto and the moving contact 32′ of the interrupter unit 6. There can be two vacuum interrupters which, for example, have a rated voltage of 170 kV (interrupter unit 4) and a rated voltage of 145 kV (interrupter unit 6). By means of this series arrangement of vacuum interrupters with different rated voltages, the rated voltage of the overall current interrupter system is accumulated from the rated voltages of the individual interrupter units.
[0027] FIG. 1 describes the basic position of the current interrupter system 2 in the closed state of the interrupter units 4 and 6, but the arrow 20, which illustrates a unidirectional rotational movement 20 of the crank shaft 10, also shows that the illustration in FIG. 1 is a dynamic illustration which, in the event of a 180° rotation along the arrow 20, results in the open position of the current interrupter system 2 according to FIG. 2. A further unidirectional rotation along the arrow 20 after the opening position according to FIG. 2 leads in turn to a closing movement and ultimately to the state which is depicted in FIG. 1. A 360° rotation of the crank shaft 10 thus results in the interrupter units 4, 6 being opened once and closed again. A further rotation about 180° would in turn result in an opening movement.
[0028] The advantage of the continuously unidirectional movement of the crank shaft 10, driven by the drive assembly 9, consists in that, in addition to the simplified transmission by a single drive system 8, it is also possible to select a more cost-effective drive variant with regard to the drive assembly 9. A technically complicated, bidirectional driving movement can be dispensed with here, with this not absolutely being necessary. The transition from open position and closed position of the interrupter units 4, 6, as is illustrated in FIGS. 1 and 2, can basically also take place with a bidirectional movement, but a unidirectional movement is firstly made possible by the use of the crank shaft 10 and leads to technically less complicated drive assemblies 9, for example electric motors or spring stores having spiral springs, being able to be used.
[0029] FIG. 3 illustrates a cross section through a crank shaft 10, with the cross-sectional profile in the region of a crank being sectioned through a crank pin 24 and through a plain bearing 28. The crank which can be configured both in the form of the cranks 12 or 14 is here, by way of example, an eccentric disk which, in order to avoid imbalances, has a counterweight on the other side of the axis of rotation 26 of the crank shaft 10. The respectively possible crank stroke 16 or 18 is illustrated by the double arrow which runs between the center point of the axis of rotation 26 and the center point of the crank pin 24. If the crank 12, 14 rotates about the axis of rotation 26, the crank pin 24 carries out a circular movement about the axis of rotation 26. The plain bearing 28 which is arranged around the crank pin 24 rotates here in the process since it is connected to a push rod 30, at the end of which, as illustrated in FIG. 1, there is a further plain bearing 50, but the latter is in each case oriented along a translational movement and transmits said movement to the contact bolt, not illustrated here.
[0030] In a further refinement of the invention, in each case three pairs 22 of interrupter units 4 and 6 connected in series are arranged on the crank shaft 10. One pair 22 of the interrupter units 4 and 6 in each case carries out the function that are already described with respect to FIGS. 1 and 2. The arrangement of three such structurally identical pairs of interrupter units 4, 6 represents the three phases of a power supply that have to be separated simultaneously by a respective interrupter unit or here by a pair 22 of interrupter units 4, 6. It is possible here to operate all three phases with one drive unit 8, wherein, as already mentioned, each phase has two different interrupter units 4, 6. Each pair 22 of interrupter units 4, 6 is connected here in each case to a pair of cranks 14, 16 which each again have the different contact stroke 16 and 18. Otherwise, the pairs 22 have the same technical features which have already been described with respect to FIGS. 1, 2 and 3.
[0031] In a further embodiment similarly to in FIG. 4, the schematic illustration according to FIG. 5 has an arrangement of three pairs 22 of interrupter units 4, 6 connected in series. The difference with regard to FIG. 4 consists in that, in this embodiment, in each case two interrupter units 4 or 6 are arranged offset with respect to each other, which leads to construction space being able to be saved linearly along the crank shafts 10, which, in many applications in which construction space is tight, can afford a decisive advantage in terms of costs. The crank shaft 10 according to FIG. 5 is configured in such a manner that the cranks 14 and 12 face radially with respect to the axis of rotation 26 in different directions, in particular in directions offset by 180°. However, it should be noted that, in this implementation, at least every second crank 12 or 14 and the push rod 30 connected thereto requires a mechanical deflecting mechanism which is not described specifically in this purely schematic illustration according to FIG. 5.
LIST OF REFERENCE SIGNS
[0032] 2 Current interrupter system [0033] 4 Interrupter unit U.sub.B1 [0034] 6 Interrupter unit U.sub.B2 [0035] 8 Drive system [0036] 9 Drive assembly [0037] 10 Crank shaft [0038] 12 First crank [0039] 14 Second crank [0040] 16 First crank stroke [0041] 18 Second crank stroke [0042] 20 Unidirectional rotational movement [0043] 22 Pair of interrupter units connected in series [0044] 24 Crank pin [0045] 26 Axis of rotation [0046] 28 Plain bearing [0047] 30 Push rod [0048] 32 Contact bolt [0049] 34 Crank shaft bearing [0050] 36 Contact system [0051] 38 Moving contact [0052] 40 Fixed contact [0053] 42 Housing [0054] 44 Vacuum chamber [0055] 46 Current connector [0056] 48 Bus bars [0057] 50 Further plain bearing
