EP3210223B1 - Drive device for an electrical switching device - Google Patents

Description

The invention relates to a drive device for an electrical switching device, in particular for a high voltage switch, according to the preamble of claim 1. Such a drive device is for example from the DE 9109812 known.

The known device has the disadvantage that in an operable state, no influence on the properties of the spring of the energy storage device and thus the performance of the energy storage device can be taken. In particular, a housing containing the insulating fluid must be opened in order to be able to influence the spring, which first requires extensive extraction of the insulating fluid and then, if necessary, maintenance of the spring, a refilling to restore an operational state. The documents US 3 909 676 A and WO 2004/055850 A1 disclose solutions for outside adjustment of the contact pressure force of contact pressure springs in switchgear.

Accordingly, it is an object of the present invention to improve a device of the type mentioned in that the aforementioned disadvantages are avoided and in particular an influence on the performance of the energy storage device is made possible without having to open the housing.

This object is achieved according to the invention in the drive device of the type mentioned in that an adjusting device which can be actuated on the outside of the housing is provided by means of which a position of the stop in the housing can be adjusted along an axis. This advantageously makes it possible to influence the mechanical energy stored in the spring in the tensioned state by: the position of the stopper is varied. Using the setting device according to the invention, the position of the stop used for tensioning the spring can be carried out particularly advantageously by actuating the adjusting device on the outside of the housing so that no evacuation of the housing or refilling with insulating fluid, in particular insulating gas, is required after adjustment. Rather, the housing for the entire adjustment unopened and remain filled with insulating fluid, so that the drive device according to the invention is always ready for use and yet is flexibly adjustable with respect to the energy stored in the spring. As a result, adjustment of the spring energy and thus of the operating behavior of the energy storage device of the switching device can in particular also be carried out in the field during operation of the drive device.

Using the principle according to the invention, a simple adaptation of the operating behavior, in particular of the (re) switching behavior of switching devices, especially of the switching times, can be carried out particularly advantageously in addition to the mass system of the chain of action (spring, drive rod (s), shafts, switching contact (e)). ) of the switching device depend on the energy stored in the spring. For example, the spring of the drive device according to the invention can be used as a so-called "opening spring", which consequently drives at least one switching contact of an associated switching device in the sense of a switch-off operation. Using the invention can thus - without having to open the usually insulating gas containing housing of the drive device - thus advantageously the switching time can be changed, whereby, for example, manufacturing tolerances of the springs and other components, age-related drift effects and the like can be easily compensated. In switchgear with multiple switching devices and accordingly more each of the individual switching devices associated drive devices can by the invention Given setting options, the switching times of all switching devices are adjusted so that, for example, three- or multi-phase high-voltage circuit breaker can be provided, which have no appreciable deviations in the switching times between the respective phases.

In one embodiment, the housing has an opening, wherein an adjustable with the stop adjustment of the adjusting device is arranged to be movable in the opening, in particular parallel to or along the axis movable.

In one embodiment, the housing has a guide for the adjusting element in the region of the opening. Particularly preferably, the housing has an internal thread in the region of the opening, wherein the adjustment element has an external thread cooperating with the internal thread. In this way, by screwing the adjusting element into the housing or by unscrewing the adjusting element from the housing, the position of the stop serving for the tension of the spring and thus the mechanical energy which can be stored in the spring can be varied.

In one embodiment, a sealing element is provided, which seals an interior of the housing against the opening, wherein preferably at least one annular seal and / or a lip sealing ring is associated with the sealing element. Alternatively or in addition to the sealing element, in other embodiments, the guidance of the adjusting element or the thread of the adjusting element can be designed so that it fulfills a sealing effect.

In a further embodiment, it is provided that the stop is arranged on an end face of the sealing element facing the interior space, as a result of which a particularly small-sized configuration is obtained.

In a further embodiment, it is provided that the sealing element can be coupled to the setting element on its end face facing away from the interior. In one variant, the coupling of the elements can be designed so that (only) compressive forces can be transmitted, on the assumption that the spring transmits corresponding pressure forces to the sealing element and thus presses it against the adjusting element. In particular, it can also be provided that the sealing element and the adjusting element are not rotatably connected to each other, so that an optionally resulting during a screwing of the adjusting rotation of the same does not transfer to the sealing element and / or the spring. In particular, this can also be ensured that an optionally existing ring seal is not subjected to rotation.

In a further embodiment it is provided that the sealing element is formed integrally with the adjusting element, whereby a lesser installation effort is given.

A particularly simple adjustment of the position of the stop for the spring and thus the storable energy results according to a further embodiment, in which the adjusting element on its side facing away from the interior of the housing a driving profile, e.g. a hexagon socket or the like.

In a further embodiment it is provided that the housing has a hollow cylindrical portion, wherein the adjusting device and / or at least a part of the spring is arranged in the hollow cylindrical portion, whereby the drive device is particularly small and, if necessary, no further devices for guiding the spring in the housing are necessary. Furthermore, this makes it possible to adapt the housing in the region of the hollow cylindrical section to the geometry of the spring, as a result of which, for example, it has smaller dimensions in this area than other areas of the housing, so that further degrees of freedom with regard to the arrangement of the drive device in or on a target system, in particular a high-voltage switch or a switchgear, are given.

In a further embodiment it is provided that a ratio of an outer diameter of the hollow cylindrical portion to an outer diameter of the spring is between about 110 percent and about 200 percent, in particular between about 110 percent and about 150 percent, resulting in a particularly small-sized configuration.

In a further embodiment it is provided that the spring is coupled at its end region facing away from the stop with a first lever arm of a lever arranged rotatably in the housing, in particular by means of a spring plate rotatably mounted on the lever. Advantageously, the spring force can be transmitted to another element of the chain of action of the drive device or the switching device assigned to it via the lever.

In a further embodiment it is provided that a second lever arm of the lever is coupled to a drive rod for actuating a switching contact of the switching device.

In a further embodiment, a secondary sealing element is provided, which seals the interior of the housing against the opening, in particular independently of the sealing element or independent of a state of the sealing element. The secondary sealing element can advantageously be arranged as it were "in series" with the above-mentioned (primary) sealing element and further improve the sealing effect in the region of the opening.

In a further embodiment, a securing element is provided which is for locking the adjusting device, in particular for locking a component of Adjustment device is formed. In this way, an unintentional adjustment of the adjusting device is advantageously avoided, as may occur, for example, by vibrations and / or temperature changes.

As a further solution of the object of the present invention, a switchgear with at least one switching device and with at least one drive device according to the invention is specified.

Other features, applications and advantages of the invention will become apparent from the following description of embodiments of the invention, which are illustrated in the figures of the drawing.

• Figur 1 schematisch eine erste Ausführungsform der erfindungsgemäßen Antriebseinrichtung,
• Figur 2a schematisch einen teilweisen Querschnitt einer zweiten Ausführungsform der erfindungsgemäßen Antriebseinrichtung in einem ersten Betriebszustand,
• Figur 2b schematisch einen teilweisen Querschnitt der zweiten Ausführungsform der erfindungsgemäßen Antriebseinrichtung in einem zweiten Betriebszustand,
• Figur 3 schematisch eine dreiphasige Schaltanlage gemäß einer Ausführungsform, und
• Figur 4a,4b weitere Ausführungsformen.

In the drawing shows:

• FIG. 1 schematically a first embodiment of the drive device according to the invention,
• FIG. 2a FIG. 2 schematically shows a partial cross section of a second embodiment of the drive device according to the invention in a first operating state, FIG.
• FIG. 2b FIG. 2 shows schematically a partial cross section of the second embodiment of the drive device according to the invention in a second operating state, FIG.
• FIG. 3 schematically a three-phase switchgear according to an embodiment, and
• FIG. 4a . 4b further embodiments.

FIG. 1 schematically shows a first embodiment of the drive device 100 according to the invention. The drive device 100 is for example for driving a switch contact (not shown) of an electrical switching device 10, in particular for a high voltage switch or a high-voltage circuit breaker provided, and may in one embodiment, for example, together with the switching device 10 may be housed in a common housing 102. An interior of the housing 102 can be filled with an insulating fluid, in particular insulating gas, for example with SF6 (sulfur hexafluoride) and / or CF4 (tetrafluoromethane) and / or CO2 (carbon dioxide) and / or a gas from the group of fluorinated nitriles or mixtures thereof , For example, a mixture of a fluorinated nitrile, which is also sold under the trade name Novec 4710 by 3M, with carbon dioxide is particularly preferred as the insulating fluid. Such a mixture is also referred to as "G3" insulating gas.

In known manner, the drive device 100 has an energy storage device 12, which by means of at least one spring (not in FIG. 1 shown) in a tensioned state of the spring mechanical energy stores.

According to the invention, an adjusting device 114 which can be actuated on the outside of the housing 102 is provided, by means of which a position of a stop (not shown), against which the spring is tensioned, can be adjusted in the housing along an axis. As a result, the amount of mechanical energy which can be stored in the spring of the energy storage device 12 and which can be called up for switching operations can be easily adjusted from the outside to the drive device 100 without having to open it.

FIG. 2a schematically shows a partial cross section of a second embodiment 100a of the drive device according to the invention. As already with reference to Fig. 1 described, the drive device 100a together with its associated switching device, of which in FIG. 2a only one drive rod 104 is shown to be disposed in the common housing 102. The interior I of the housing 102 may be filled with an insulating fluid, in particular with an insulating gas such as SF6.

In the housing 102, a lever 106 is provided, which is rotatably mounted on a first shaft 106a and has two lever arms 106b, 106c. The lever 106 serves to transmit the spring force of the likewise arranged in the housing 102 spring 108 on the drive rod 104, which acts, for example, on a switch contact, not shown, of the drive device 100a associated switching device. For example, the spring 108 can be used as a so-called "opening spring" which - starting from a tensioned against the stop 112a state - via the lever 106 and the drive rod 104 drives at least one switching contact of the associated switching device in the sense of a turn-off.

In one embodiment, the shaft 106a may also be led outwardly through a housing wall (not shown) so that torque may be introduced into the shaft 106a from outside through further drive components such as an electromechanical drive or the like to return the spring 108 (again ) to tension.

In its lever 106 facing end portion 108 a, the spring 108 is located as in FIG. 2a shown on the spring plate 110, which, preferably rotatable with the in FIG. 2a left lever arm 106b is connected. As already described, the other end of the spring 108 bears against the stop 112a, which is part of the setting device 114 according to the invention.

The adjusting device 114 has a substantially disc-shaped adjusting element 114a, which in an opening 102a of the housing 102 along an in FIG. 2a vertically extending axis, which in the present case corresponds to the longitudinal axis LA1 of the spring 108, is arranged to be movable. The adjusting element 114a has an external thread which cooperates with an internal thread 114b of the housing 102 in such a way that the adjusting element 114a can be screwed into the housing or out of the housing by rotation about the axis LA1, which is also indicated by the block arrow P1 indicated axial mobility results. For this purpose, on an outside, ie in FIG. 2a lower, front side of the adjusting 114a a driving profile, such as a common hexagon socket or the like may be provided.

Advantageously, since the opening 102a of the housing 102 is disposed in a hollow cylindrical portion 102b of the housing, this portion 102b may simultaneously receive and / or guide at least a portion of the spring 108 and portions of the adjuster 114.

The adjusting element 114a is preferably coupled to a sealing element 112, wherein an inside end face of the sealing element 112 advantageously has or forms the stop 112a for the spring 108.

The coupling of the sealing element 112 with the adjusting element 114 results in an axial mobility of the components 112, 114 and thus also of the stop 112a, against which the spring 108 can be tensioned, so that the spring travel of the spring 108 and thus the amount of mechanical energy , which can be stored in the spring 108 by the tensioning of the spring 108, is easily adjustable by screwing in or unscrewing the adjusting element. This can be advantageous by sole actuation of the adjusting element 114a from the outside, ie without opening the housing 102, manufacturing tolerances and / or aging-related or temperature-induced changes in the spring constant of the spring 108 are compensated, so that a precise adherence to the required switching times of the driven by the drive device 100a switching device is ensured by simple and inexpensive adjustment of the position of the stopper 112a over the entire life of the device. In particular, gas exchange of the insulating gas and, in general, opening / closing of the housing 102 can be avoided in this way.

At the in FIG. 2a shown operating state is a bearing surface of the stop 112a at the location coordinate x0 of in FIG. 2a vertically downward pointing coordinate axis x. At the in FIG. 2b shown operating state, the bearing surface of the stop 112a is located at the location coordinate x1> x0 the coordinate axis x, which corresponds to a lower energy storable in the spring 108.

In a further embodiment, an end face 112b facing the adjustment element 114a (FIG. FIG. 2a ) of the sealing element 112 be releasably or non-detachably connected to the mating surface of the adjusting element 114a.

In a further embodiment, the sealing element 112 has at least one non-designated circumferential groove, in which an annular seal 112c is inserted, which seals the inner space I against the environment or the opening 102a. Alternatively or additionally, a lateral surface of the sealing element 112 and the inner surface of the hollow-cylindrical housing section 102b, which faces radially outwardly thereof, can have a high surface quality, in particular low roughness, which can likewise contribute to the sealing effect. As an alternative or in addition to the sealing element 112, in other embodiments, the guidance of the adjusting element 114 or the thread 114b of the adjusting element can be designed so that it fulfills a sealing effect.

In a further embodiment it is provided that a ratio of an outer diameter d1 (FIG. Fig. 2b ) of the hollow cylindrical portion to an outer diameter d2 of the spring 108 is between about 110 percent and about 200 percent, in particular between about 110 percent and about 150 percent, resulting in a particularly small-sized configuration.

FIG. 3 schematically shows a three-phase switchgear 200 according to one embodiment. The switchgear 200 has a switching device 10a, 10b, 10c for each phase, to each of which a drive device 100a, 100b, 100c according to the invention is assigned. The drive devices 100b, 100c are advantageously designed as well as those described above with reference to FIG Fig. 2a . 2 B described drive device 100a.

Advantageously, by the present invention given adjustment options for the position of the stop 112a ( FIG. 2a ) the switching times of all three switching devices 10a, 10b, 10c are adjusted so that no appreciable deviations occur in the switching times between the respective phases.

In a further embodiment (not shown), the spring 108 may also be designed as a tension spring and with respect to the drive rod 104 (FIG. Fig. 2a ) may be arranged with its first end 108a, for example, on the second lever arm 106c. In this case, the second spring end can be attached to an adjusting element or a corresponding adjusting device designed for connection to the tension spring. Consequently, in this embodiment, the first lever arm 106b can be dispensed with and a part of the housing 102 which is comparable to the section 102b can be omitted, for example in FIG Fig. 2a be arranged below the attachment point of the drive rod 104 on the lever arm 106c. In this case, the achievable by the spring pulling force would be through the Setting just alike easily adjustable from the outside as the pressure bias in the embodiment according to FIG. 2a . 2 B ,

FIG. 4a schematically shows an aspect of another embodiment 100b 'of the drive device according to the invention. For clarity, only the part of the housing 102 is shown, which receives the adjustment 114. In addition to the adjustment device 114 and the (primary) sealing element 112, cf. also Fig. 2a is at the drive device 100b 'according to FIG. 4a a secondary sealing element 1120 is provided, which seals the interior I of the housing 102 against the opening 102a (FIG. Fig. 2a ), in particular independently of the primary sealing element 112 and / or independent of a state of the primary sealing element 112. In the present case, the secondary sealing element 1120 is provided with an external thread, which cooperates with the internal thread 114b of the portion 102b, so that the secondary sealing element 1120 in the housing 102 is screwed in or out of this. The secondary sealing element 1120 has in its present in its Fig. 4a bottom portion a flange-like widening, which carries a second sealing ring 1122, which is pressed into the housing 102 when screwing the secondary sealing element 1120 into the housing 102 and thus contributes to the sealing of the interior I. This results in a series connection of the two sealing elements 112, 1120 between the interior I and the environment. Overall, the secondary sealing element 1120 has, for example, a substantially T-shaped cross-section.

In another embodiment, the secondary sealing member 1120 may also include a gland.

In a further embodiment, the housing portion 102b in its in Fig. 4a Lower area, for example, a flange (not shown), on which a to Component 1122 comparable sealing ring is arranged. In this case, the secondary sealing element may for example be formed by a substantially disc-shaped body, which is attachable to the flange (in particular screwed or clamped) and is held in this manner sealingly against the sealing ring 1122 relative to the housing 102.

FIG. 4b schematically shows an aspect of another embodiment 100c 'of the drive device according to the invention. For clarity, again, only the part of the housing 102 is shown, which receives the adjustment 114. In the present case, a securing element 116 is provided, which is designed to lock the adjusting device 114, as a result of which an undesired adjustment of the adjusting device 114 is avoided, as may occur, for example, due to vibrations and / or temperature changes. In the present case, the securing element 116 is designed as a counter-bolt with an external thread (not shown) matching the internal thread 114b and can be screwed tightly against the adjusting device 114 by screwing it into the housing section 102b to lock the adjusting device 114. FIG. 4b shows a state in which the lock screw 116 is not already in contact with the adjusting 114a.

Claims (17)

1. Drive device (100) for an electrical switching device (10), in particular for a high-voltage switch, having a housing (102) which can be filled with insulating gas, having an energy storage device (12) which is arranged in the housing (102) and has a spring (108) and a stop (112a) against which the spring (108) can be tensioned, characterised in that an adjustment device (114), which can be actuated from the exterior of the housing (102) is provided, by means of which a position of said stop (112a) in said housing (102) can be adjusted along an axis (LA1).
2. Drive device (100) according to claim 1, wherein said housing (102) has an opening (102a), and wherein an adjustment element (114a) of said adjustment device (114), which can be coupled to said stop (112a), is movably arranged in said opening (102a), in particular parallel to or along the axis (x).
3. Drive device (100) according to claim 2, wherein said housing (102) has a guide for the adjustment element (114a) in the area of said opening (102a).
4. Drive device (100) according to claim 2 or 3, wherein said housing (102) has an internal thread (114b) in the area of said opening (102a), and wherein the adjustment element (114a) has an external thread cooperating with said internal thread (114b).
5. Drive device (100) according to any one of claims 2 to 4, wherein a sealing element (112) is provided which seals an interior space (I) of said housing (102) against said opening (102a), wherein preferably the sealing element (112) is associated with at least one ring seal (112c) and/or at least one lip seal ring.
6. Drive device (100) according to claim 5, wherein said stop (112a) is arranged on an end face of said sealing element (112) facing said interior space (I).
7. Drive device (100) according to any one of claims 5 to 6, wherein said sealing element (112) can be coupled to said adjustment element (114a) on its end face (112b) facing away from the interior space.
8. Drive device (100) according to any one of claims 5 to 7, wherein said sealing element (112) is formed integrally with the adjustment element (114a).
9. Drive device (100) according to any one of claims 2 to 8, wherein said adjustment element (114a) has a driving profile on its side facing away from said interior space (I) of said housing (102).
10. Drive device (100) according to any one of the preceding claims, wherein said housing (102) has a hollow cylindrical portion (102b), and wherein the adjustment device (114) and/or at least a portion of the spring (108) is arranged in said hollow cylindrical portion (102b).
11. Drive device (100) according to claim 10, wherein a ratio of an outer diameter (d1) of said hollow cylindrical portion (102b) to an outer diameter (d2) of said spring (108) is between about 110 per cent and about 200 per cent, more particularly between about 110 per cent and about 150 per cent.
12. Drive device (100) according to any one of the preceding claims, wherein said spring (108) at its end section (108a) facing away from said stop (112a) is coupled to a first lever arm (106b) of a lever (106) rotatably mounted in said housing (102), in particular by means of a spring plate (110) which is arranged rotatably on said lever (106).
13. Drive device (100) according to claim 12, wherein a second lever arm (106c) of said lever (106) is coupled to a drive rod (104) for actuating a switching contact of said switching device (10).
14. Drive device (100) according to any one of claims 2 to 13, wherein a secondary sealing element (1120) is provided, which seals said interior space (I) of said housing (102) against said opening (102a), in particular independently of said sealing element (112) or independently of a state of said sealing element (112).
15. Drive device (100) according to any one of the preceding claims, wherein a securing element (116) is provided, which is configured for locking said adjustment device (114).
16. Drive device (100) according to any one of the preceding claims, wherein said housing (102) contains at least one insulating gas of the following group: sulphur hexafluoride, tetrafluoromethane, carbon dioxide, a gas from the group of fluorinated nitriles, wherein said housing (102) preferably contains a mixture of a fluorinated nitrile with carbon dioxide.
17. Switching system (200) having at least one switching device (10a, 10b, 10c) and having at least one drive device (100; 100a, 100b, 100c) according to any one of the preceding claims.

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