EP3210223A1

EP3210223A1 - Drive device for an electrical switching device

Info

Publication number: EP3210223A1
Application number: EP16705741.3A
Authority: EP
Inventors: Gerrit Boehm; Achim Stelter
Original assignee: General Electric Technology GmbH
Current assignee: General Electric Technology GmbH
Priority date: 2015-02-26
Filing date: 2016-02-05
Publication date: 2017-08-30
Anticipated expiration: 2036-02-05
Also published as: KR20170120116A; CA2975424A1; DE102015203479A1; WO2016134955A1; US10176946B2; CN107258006A; EP3210223B1; HUE039115T2; US20180019082A1

Abstract

The invention relates to a 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 which is arranged in the housing (102) and has a spring (108) and a stop (112a) against which the spring (108) can be tensioned. According to the invention, an adjustment device (114) which can be actuated from the exterior of the housing (102) is provided, by means of which adjustment device (114) a position of the stop (112a) in the housing (102) can be adjusted along an axis (x).

Description

Title: Drive device for an electrical switching device

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 known for example from DE 9109812.

The known device has the disadvantage that in an operable state, no influence on the

Characteristics 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 to the spring

to be able to influence, which initially requires a complex suction of the insulating fluid and then, after possibly successful maintenance of the spring, a refilling to restore a ready-to-use state.

Accordingly, it is an object of the present invention, a device of the type mentioned above to

improve that the above-mentioned disadvantages are avoided and in particular an influence on the

Operating behavior of the energy storage device is made possible without having to open the housing.

This object is achieved in the drive device of the aforementioned type according to the invention that an externally operable on the housing side adjusting device is provided by means of a position of the stopper in the housing along an axis is adjustable. 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. Especially

can be advantageous using the inventive

Einsteileinrichtung the position of the stop used for tensioning the spring by an outside of the housing take place actuation of the adjusting device, so that no evacuation of the housing or a renewed

Filling 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 inventive

Drive device is always ready 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.

Particularly advantageous may be using the

According to the invention a simple adaptation of the

Operating behavior, in particular the (re) switching behavior of switching devices, especially the switching times, take place, in addition to the mass system of the chain of effects (spring,

Drive rod (s), shafts, switch contact (s)) of the switchgear depend on the energy stored in the spring.

For example, the spring of the invention

Drive device can be used as a so-called. "Ausschaltfeder", which thus drives at least one switching contact of an associated switching device in the sense of a turn-off. Using the invention, without the i.d.R. To have to open insulating gas-containing housing of the drive device - thus advantageously the switching time can be changed, whereby, for example, manufacturing tolerances of

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 settings, the switching times of all

Switching devices are aligned so that, for example, three- or multi-phase high-voltage circuit breakers

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 adjusting element 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 in the region of the opening

Internal thread, wherein the adjusting element with the

Internal thread has cooperating external thread. This can be done by screwing in the

Setting element in the housing or by a

Unscrewing the adjustment from the housing, the position of the serving for the tension of the spring stopper and thus the stored in the spring mechanical energy 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 can in other embodiments, the leadership of

Adjustment element or the thread of the adjustment are designed so that it meets 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 may be designed so that (only) compressive forces can be transmitted, on the assumption that the spring exerts corresponding compressive forces on the sealing element

transmits and thus presses this to the adjustment. 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 ensure that a possibly

existing ring seal is not subjected to a 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. one

Allen or similar.

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 builds and possibly no other devices for guiding the spring in the housing are necessary. Furthermore, thereby the housing in the

Area of the hollow cylindrical section can be adapted to the geometry of the spring, reducing it in this area

For example, has smaller dimensions than other areas of the housing, so that more 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. About the lever can be advantageous to the spring force to another element of the

Chain of action of the drive device or hers

assigned switching device to be transmitted.

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 another embodiment, a secondary one

Sealing element is provided which seals the interior of the housing against the opening, in particular independent 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 inadvertent adjustment of the advantageous

Einteileinrichtung avoided, as for example by

Vibrations and / or temperature changes can occur.

As a further solution to the problem of the present

Invention is a switchgear with at least one

Switchgear and with at least one invention

Drive device specified.

Other features, uses and benefits of

Invention will become apparent from the following description of embodiments of the invention, which are illustrated in the figures of the drawing. All described or illustrated features form for themselves or in any

Combination the subject of the invention, regardless of

their abstract in the claims or their

Relationship and regardless of their formulation or

Representation in the description or in the drawing.

In the drawing shows:

Figure 1 schematically shows a first embodiment of

drive device according to the invention,

FIG. 2a schematically shows a partial cross-section of a second embodiment of the drive device according to the invention in a first operating state,

FIG. 2b schematically shows a partial cross section of FIG

second embodiment of the drive device according to the invention in a second operating state,

3 shows 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

Drive device 100 is for example for driving a switching contact (not shown) of an electrical

Switching device 10, in particular for a high-voltage switch or a high-voltage circuit breaker, provided and can in one embodiment, for example, together with the switching device 10 in a common housing 102nd

be housed. 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 CO 2 (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

Mixture is also referred to as "G3" insulating gas.

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

According to the invention, an outside of the housing 102

actuatable adjusting device 114 is provided, by means of which a position of a stop (not shown), against which the spring is tensioned, is adjustable in the housing along an axis. This can increase the level of mechanical

Energy which can be stored in the spring of the energy storage device 12 and which is retrievable 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 invention

Driving means. As already described with reference to FIG. 1, the drive device 100a, together with its associated switching device, of which only one drive rod 104 is shown in FIG

Housing 102 may be arranged. The interior I of the housing 102 can with an insulating fluid, in particular with a

Insulating gas, e.g. SF6, be filled.

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 also arranged in the housing 102 spring 108 on the drive rod 104, for example, to a switch contact, not shown, of

Drive device 100a associated switching device acts. 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 end region 108a facing the lever 106, the spring 108 rests against the spring plate 110, as shown in FIG. 2a, which, preferably rotatably, is connected to the left-hand lever arm 106b in FIG. 2a. As already described, the other end of the spring 108 is clamped against the stop 112a, which is part of the adjusting device 114 according to the invention. The adjusting device 114 has a substantially

disk-shaped adjusting element 114a, which in a

Opening 102a of the housing 102 along a in Figure 2a vertically extending axis, which in the present case corresponds to the longitudinal axis LAl of the spring 108, is arranged 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, as a result of which the block arrow PI indicated axial mobility results. For this purpose, on an outside, i. in Figure 2a lower, front side of the

Adjustment element 114a a driving profile, e.g. a common hexagon socket or the like may be provided.

Since the opening 102a of the housing 102 is presently arranged in a hollow cylindrical section 102b of the housing, this section 102b may advantageously be simultaneous

at least a portion of the spring 108 and parts of the

Accommodate and / or guide an actuator 114.

The adjusting element 114a is preferably provided with a

Sealing member 112 is coupled, wherein an inside

End face of the sealing element 112 advantageously has the stop 112a for the spring 108 and forms.

By coupling the sealing element 112 with the

Setting 114 results in an axial mobility of the components 112, 114 and thus also of the stop 112 a, against which the spring 108 can be tensioned, so that the spring travel of the spring 108 and thus the amount of mechanical energy caused by the tensioning of the spring 108th can be stored in the spring 108, in a simple way by or

Unscrewing the adjustment is adjustable.

This may advantageously be achieved by the sole actuation of the adjustment element 114a from outside, i. 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 by simple and inexpensive adjustment of the position of the

Stop 112a is ensured 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.

In the operating state shown in FIG. 2a, a contact surface of the stop 112a lies at the location coordinate x0 of the coordinate axis x pointing vertically downwards in FIG. 2a. In the operating state shown in Figure 2b is the

Support surface of the stop 112a at the location coordinate xl> xO the coordinate axis x, which corresponds to a lower energy storable in the spring 108.

In another embodiment, a the

Setting element 114a facing end face 112b (Figure 2a) of the sealing element 112 detachable or non-detachable with the

Counter surface of the adjusting 114a be connected.

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 radially outwardly opposite inner surface of the hollow cylindrical housing portion 102b a high surface quality, in particular low roughness,

have, which can also contribute to the sealing effect. Alternatively or in addition to the sealing element 112, in other embodiments, the leadership of

Adjustment element 114 and the thread 114b of the

Setting element be designed so that there is a

Sealing effect fulfilled. In another embodiment, it is contemplated that a ratio of an outer diameter d1 (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, more preferably between about 110 percent and about 150 percent a very small building

Configuration results.

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 means 100b, 100c are advantageously formed as well as the above under

Referring to Fig. 2a, 2b described drive device 100a.

Advantageously, given by the present invention

Setting options for the position of the stop 112a (Figure 2a), the switching times of all three switching devices 10a, 10b, 10c are adjusted, so that no appreciable

Deviations in the switching times between the respective phases occur.

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. 2a) with its first end 108a, for example, also be arranged 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 may be dispensed with and the portion 102b

comparable part of the housing 102 e.g. in 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 A setting device equally simple from the outside

adjustable as the pressure bias at the

Embodiment of Figure 2a, 2b.

Figure 4a shows schematically an aspect of another

Embodiment 100b 'of the invention

Driving means. For clarity, only the part of the housing 102 is shown, the

An adjusting device 114 receives. In addition to the

Adjustment means 114 and the (primary) sealing element 112, cf. 2a, a secondary sealing element 1120 is provided in the drive device 100b 'according to FIG. 4a, which seals the interior I of the housing 102 against the opening 102a (FIG. 2a), in particular independently of the primary sealing element 112 and / or independently one

State of the primary sealing element 112. In the present case, the secondary sealing element 1120 is provided with an external thread which engages with the internal thread 114b of the section 102b

cooperates, so that the secondary sealing element 1120 in the housing 102 into or out of this herausschraubbar. The secondary sealing element 1120 has in this case in its lower in Fig. 4a area a flange-like widening, which carries a second sealing ring 1122, which in the

Screwing the secondary sealing element 1120 is pressed into the housing 102 against 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 a further embodiment, the secondary

Sealing element 1120 also have a stuffing box.

In another embodiment, the housing portion 102b in its lower in Fig. 4a 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 can be formed, for example, by a substantially disk-shaped body, which can be attached to the flange (in particular

screwed or clamped) and is held in this manner sealing against the sealing ring 1122 relative to the housing 102.

FIG. 4b schematically shows an aspect of another

Embodiment 100c 'of the invention

Driving means. For clarity, again, only the part of the housing 102 is shown, which receives the adjusting device 114. Present is a

Secured element 116 is provided, which is designed to lock the adjusting device 114, whereby a

undesired adjustment of the adjusting device 114

is avoided, as may occur for example by vibration and / or temperature change. In the present case, the securing element 116 as a counter screw with to

Internal thread 114b mating external thread (not shown) is formed and can be screwed to lock the Einsteileinrichtung 114 by screwing it into the housing portion 102b against the setting device 114. FIG. 4b shows a state in which the lock screw 116 is not already in contact with the adjustment element 114a.

Claims

claims

Drive device (100) for an electric

Switching device (10), in particular for a

High voltage switch, with one with insulating gas

a fillable housing (102) having an energy storage device (12) disposed in the housing (102) and having a spring (108) and a stop (112a) against which the spring (108) is tensionable

in that an adjustment device (114) which can be actuated on the outside of the housing (102) is provided, by means of which a position of the stop (112a) in the housing (102) can be adjusted along an axis (LA1).

Drive device (100) according to claim 1, wherein the housing (102) has an opening (102a), and wherein an adjusting element (114a) of the adjusting device (114) which can be coupled to the stop (112a) is movably arranged in the opening (102a). in particular parallel to or along the axis (x) movable.

Drive device (100) according to claim 2, wherein the housing (102) in the region of the opening (102a) has a guide for the adjusting element (114a).

Drive device (100) according to claim 2 or 3, wherein the housing (102) in the region of the opening (102 a) has an internal thread (114 b), and wherein the

Adjustment (114a) has a cooperating with the internal thread (114b) external thread.

Drive device (100) according to one of claims 2 to 4, wherein a sealing element (112) is provided, which seals an inner space (I) of the housing (102) against the opening (102a), wherein preferably the sealing element (112) at least one annular seal (112c) and / or at least one lip sealing ring is assigned.

6. Drive device (100) according to claim 5, wherein on a the interior (I) facing end of the

Sealing element (112) of the stop (112 a) is arranged.

7. Drive device (100) according to one of claims 5 to

6, wherein the sealing element (112) on its side facing away from the interior end face (112b) with the adjusting element (114a) can be coupled.

8. Drive device (100) according to one of claims 5 to

7, wherein the sealing element (112) integral with the

Adjustment element (114a) is formed.

9. Drive device (100) according to one of claims 2 to

8, wherein the adjusting member (114 a) on its the

Interior (I) of the housing (102) facing away from a driving profile.

10. Drive device (100) according to one of the preceding claims, wherein the housing (102) has a

hollow cylindrical portion (102b), and wherein the adjusting means (114) and / or at least a part of the spring (108) in the hollow cylindrical portion (102b) is arranged.

11. Drive device (100) according to claim 10, wherein a ratio of an outer diameter (dl) of the

hollow cylindrical portion (102b) to a

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.

12. Drive device (100) according to one of the preceding claims, wherein the spring (108) at its stop (112 a) facing away from the end portion (108 a) with a first lever arm (106 b) of a rotatable in the housing (102). arranged lever (106) is coupled, in particular by means of a rotatably mounted on the lever (106) spring plate (110).

13. Drive device (100) according to claim 12, wherein a second lever arm (106 c) of the lever (106) with a

Drive rod (104) for actuating a switching contact of the switching device (10) is coupled.

14. Drive device (100) according to one of claims 2 to 13, wherein a secondary sealing element (1120) is provided, which seals the interior (I) of the housing (102) against the opening (102a), in particular independently of the sealing element (112 ) or regardless of a state of the sealing element (112).

15. Drive device (100) according to one of the preceding claims, wherein a securing element (116) is provided which is designed to lock the adjusting device (114).

16. Drive device (100) according to one of the preceding claims, wherein the housing (102) at least one

Insulating gas from the following group contains:

Sulfur hexafluoride, tetrafluoromethane,

Carbon dioxide, a gas from the group of

Fluorinated nitriles, wherein the housing (102) is preferably a mixture of a fluorinated nitrile with

Contains carbon dioxide.

17. Switchgear (200) with at least one switching device

(10a, 10b, 10c) and at least one

Drive device (100, 100a, 100b, 100c) according to one of the preceding claims.