专利汇可以提供Switch having two sets of contact elements and two drives专利检索,专利查询,专利分析的服务。并且A medium or high voltage switch (27) has a first set of contact elements (13a, 13b, 13c) and a second set of contact elements (14a, 14b, 14c). Each contact element consists of an insulating carrier (15) carrying conducting elements (16). In the closed current-carrying state of the switch, the conducting elements (16) align to form one or more current paths (34) between terminals (8, 9) of the switch (27) along an axial direction (A). For opening the switch (27), the contact elements (13a, 13b, 13c; 14a, 14b, 14c) are mutually displaced by means of two drives (18, 19) along a direction (D) perpendicular to the axial direction (A). The switching arrangement is arranged in a fluid-tight housing (1) in a gas of elevated pressure or in a liquid. The switch (27) has a high voltage withstand capability and fast switching times.,下面是Switch having two sets of contact elements and two drives专利的具体信息内容。
The invention relates to a high or medium voltage switch comprising a first and a second set of contact elements that are mutually displaceable. The invention also relates to a current breaker comprising such a switch.
A switch of this type is disclosed in
The problem to be solved by the present invention is to provide an improved switch of this type.
This problem is solved by the switch of claim 1. Accordingly, the switch comprises a first and a second terminal for applying the current to be switched. Further, it has a first and a second set of contact elements and a drive adapted to mutually displace the contact elements relative to each other along a displacement direction. Each contact element comprises an insulating carrier that carries at least one conducting element. The positions of the conducting elements are such that:
The switch comprises a first and a second drive, with each drive being connected to one of said sets of contact elements. The first and a second drives are adapted to simultaneously, i.e. concurrently or during the same time window, move the first and second set, respectively, in opposite directions. By this measure, the relative contact separation speed as well as the total contact separation distance are basically doubled, which allows faster switching and reduces the travel length of each drive resulting in a fast build-up of dielectric strength across the contact gap.
Advantageously, each drive comprises an electrical drive coil and a movable member, wherein the movable member can be moved between a first and a second location and is connected to the first or second set of contact elements, respectively. The first location corresponds to the first mutual position of the contact elements and the second location corresponds to the second mutual position of the contact elements, or vice versa. Each drive is adapted to accelerate the movable member from the first position to the second position, in a direction away from the drive coil, when a current flows through the drive coil. Thus, current pulses through the drive coils can be used to close or open the switch.
Hence, in yet a further advantageous embodiment, the switch comprises a current pulse generator structured to generate concurrent current pulses in the drive coil of the first drive and the drive coil of the second drive, thereby achieving a concurrent actuation of both drives.
A very simple design to ensure a concurrent motion is achieved by arranging the drive coil of the first drive electrically in series to the drive coil of the second drive. Thus, any current pulse simultaneously acts on both drives.
The drives are advantageously arranged within the housing, thus obviating the need for mechanical bushings.
The switch is advantageously used in high voltage applications (i.e. for voltages above 72 kV), but it can also be used for medium voltage applications (between some kV and 72 kV).
Other advantageous embodiments are listed in the dependent claims, combinations of dependent claims as well as in the description below together with the figures.
The invention will be better understood and embodiments and advantages other than those set forth above will become apparent from the following detailed description thereof. Such description makes reference to the annexed drawings, wherein:
The switch of
Housing 1 forms a GIS-type metallic enclosure of manifold type and comprises two tube sections. A first tube section 3 extends along an axial direction A, and a second tube section 4 extends along a direction D, which is called the displacement direction for reasons that will become apparent below. Axial direction A can be perpendicular or nearly perpendicular to displacement direction D. The tube sections are formed by a substantially cross-shaped housing section 5.
First tube section 3 ends in first and second support insulators 6 and 7, respectively. First support insulator 6 carries a first terminal 8 and second support insulator 7 carries a second terminal 9 of the switch. The two terminals 8, 9 extending through the support insulators 6, 7 carry the current through the switch, substantially along axial direction A.
Second tube section 4 ends in a first and a second cap or flange portion 10 and 11, respectively.
First terminal 8 and second terminal 9 extend towards a center of space 2 and end at a distance from each other, with a switching arrangement 12 located between them, at the intersection region of first tube section 3 with second tube section 4.
As can best be seen from
As shown in
The contact elements 13a, 13b, 13c, 14a, 14b, 14c can be moved along the displacement direction D into a second position, where the conducting elements 16 are staggered in respect to each other and do not form a conducting path. In
To achieve such a displacement, and as best can be seen in
In the embodiment shown in
The drives 18, 19 can e.g. operate on the repulsive Lorentz-force principle and be of the type shown in
The drives 18, 19 are arranged in opposite end regions of second tube section 4.
It should be noted that the full stroke (e.g. 20 mm per drive) of the drives may not be necessary to travel in order for the contact system to provide the dielectric strength required, but a distance much shorter (e.g. 10 mm per drive) may suffice, which can be reached in an even shorter time. This also provides certain safety in case of backtravel upon reaching the end-of-stroke position and damping phase of the actuators, see
As shown in
Conducting element 16 advantageously comprises an aluminium body with silver coating.
In the embodiment of
In the embodiment of
When the circuit breaker is in its closed current-conducting state, all solid state breakers are conducting and switch 27 is closed current-conducting state. The current substantially bypasses secondary branch 29, because the voltage drop in primary branch 28 is much smaller. Hence, for nominal currents, the losses in the circuit breaker are comparatively small.
When the current is to be interrupted, in a first step the solid state breaker(s) 30 in primary branch 28 are opened, which causes the current in primary branch 28 to drop to a small residual value that is then interrupted by opening switch 27. Now, the whole current has been commuted to secondary branch 29. In a next step, the solid state breakers 31 in secondary branch 29 are opened.
Hence, in the opened state of the circuit breaker of
The switch described above is well suited for such an application as switch 27 because of its fast switching time and its large dielectric strength.
Bistable suspension 38 comprises first and second pistons 39, 40 movable along bores 41, 42 in a direction perpendicular to displacement direction D. The pistons are pushed towards chamber 36 by means of first and second springs 43, 44. Each piston 39, 40 is connected to movable member 37 by means of a link 45, 46. Each link 45, 46 is formed by a substantially rigid rod, which is, at a first end, rotatably connected to its piston 39, 40, and, at a second end, rotatably connected to movable member 37.
The springs 43, 44 urge the links 45, 46 against movable member 37. Thus, movable member 37 can assume two stable locations within bistable suspension 38, namely a first location as shown with solid lines in
To operate movable member 37, first and second drive coils 47, 48 are arranged at opposite sides of chamber 36. Further, movable member 37 is of a conducting material, at least on its surfaces facing the drive coils 47, 48. In the first and second stable locations, movable member 37 is adjacent to first and second drive coil 47, 48, respectively.
Hence, when movable member 37 is e.g. in its first location and a current pulse is sent through first drive coil 47, a mirror current is generated within movable member 37, which leads to a repulsive force that accelerates movable member 37 away from first coil 47. The kinetic energy imparted on movable member 37 in this manner is sufficient to move movable member 37 to its second location adjacent to second drive coil 48.
The two drives 17, 18 should be operated synchronously, or at least in the same time window. A pulse generator 49 (see
Advantageously and as already mentioned, a concurrent operation can for example be easily achieved by electrically arranging the first drive coils 47 of both switches in series, as shown by the feed lines between the drives 17, 18 and pulse generator 49 in
Similarly, the second drive coils 48 of both switches should advantageously be arranged in series as well.
Housing 1 is advantageously at ground potential (e.g. in a GIS = gas-insulated substation), but it may also be on high voltage potential (e.g. in a life tank breaker).
In the above examples, each insulating carrier 15 had its own actuator rod 17. Alternatively, the number of actuator rods may be different, in particular smaller than the number of insulating carriers 15, with at least some of the insulating carriers being mechanically interconnected.
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