Patent Application
20210183598
The invention relates to a high-voltage circuit breaker, preferably of dead tank design, comprising a switching unit which has a switching device and an operating element, which is axially movable in relation to a longitudinal axis of the switching device, for operating the switching device and comprising a closing resistor unit which has a closing resistor arrangement and an actuating element, which is axially movable in relation to a longitudinal axis of this closing resistor arrangement, for operating the closing resistor arrangement, wherein the operating element is coupled to the actuating element in order to move said actuating element.
For functional reasons, the closing resistor of the closing resistor arrangement is connected shortly before the electrical circuit is closed by the switching device of the high-voltage circuit breaker and shorted after a short time (also called action time). Here, two designs are possible in principle, wherein the closing resistor can be connected in parallel or in series with the switching unit. In the case of the parallel connection, the closing resistor is connected by an additional contact system before the switching unit and then shorted by the switching unit. This contact system has to be of high-voltage-resistant design, but not dimensioned for a high current-carrying capacity. In the case of the series connection, the switching device first closes, and therefore connects the closing resistor. Said closing resistor is subsequently shorted by an additional contact system which is designed for a high current-carrying capacity, but does not have to meet a stringent dielectric requirement. In the case of metal-encapsulated high-voltage circuit breakers, a solution has been established for both variants which combines the circuit breakers and the closing resistor in a gas container. Here, the available installation space is not utilized in an optimum manner on account of deviations in the axial symmetry. One disadvantage in this case is the unnecessarily large gas volume which is filled with environmentally harmful SF6 gas in most cases.
A high-voltage circuit breaker of this kind with a closing resistor arrangement is known from document U.S. Pat. No. 5,245,145 A. Said document describes a high-voltage circuit breaker of dead tank design, comprising a switching unit which has a switching device, referred to as an interrupter unit, and an operating element, which is axially movable in relation to a longitudinal axis of the switching device, for operating the switching device and comprising a closing resistor unit which has a closing resistor arrangement (EWID arrangement) and an actuating element, which is axially movable in relation to a longitudinal axis of this closing resistor arrangement, for operating the closing resistor arrangement. The two longitudinal axes are arranged substantially coaxially, so that the operating element and the actuating element are coupled via the common axis. The coupling can take place directly or by means of a kind of coupling device which then, however, consists only of one intermediate element which is located in an enclosed gas area of the high-voltage circuit breaker. The two said units are jointly located in a high-voltage circuit breaker housing in this case.
The object of the invention is to specify a high-voltage circuit breaker which has a different construction and is of more compact design in particular.
The object is achieved by the features of the independent claims. Advantageous refinements are specified in the dependent claims.
In the high-voltage circuit breaker according to the invention comprising (i) a switching unit which has a switching device and an operating element, which is axially movable in relation to a longitudinal axis of the switching device, for operating the switching device and comprising (ii) a closing resistor unit which has a closing resistor arrangement and an actuating element, which is axially movable in relation to a longitudinal axis of this closing resistor arrangement, for operating the closing resistor arrangement, wherein the operating element is coupled to the actuating element in order to move said actuating element, provision is made for the longitudinal axis of the switching unit and the longitudinal axis of the closing resistor unit to be spaced apart from one another, wherein the operating element and the actuating element are coupled by means of a coupling device of the high-voltage circuit breaker. Therefore, the switching unit and the closing resistor unit are not arranged coaxially one behind the other on a common axis by way of their longitudinal axes and can now be arranged next to one another in a compact manner. However, a coupling device is required for coupling the operating element and the actuating element.
Given a compact arrangement of this kind next to one another, the two units (switching unit and closing resistor unit) are arranged next to one another in relation to at least one of the two corresponding longitudinal axes or, in other words, there is an axial overlap of the two units in relation to at least one of the two longitudinal axes.
The high-voltage circuit breaker or at least its switching unit is preferably of dead tank design. In the second case, the switching unit is therefore a dead tank switch.
According to a preferred refinement of the invention, provision is made for the longitudinal axes of the switching device and of the closing resistor arrangement (EWID arrangement) to have an axis offset. In this case, the two longitudinal axes are arranged in parallel in particular. The coupling device is then used for compensating for the axis offset between the longitudinal axes of the switching unit and of the closing resistor arrangement and runs substantially transversely, for example perpendicularly, to these axes. In general, the longitudinal axis of the switching device is also the longitudinal axis of the entire switching unit and the longitudinal axis of the closing resistor unit is also the longitudinal axis of the entire closing resistor unit.
The high-voltage circuit breaker advantageously has a frame or some other base which carries the switching unit and the closing resistor unit. Terms such as “above”, “below” or “next to” are clearly defined with respect to this base.
According to a preferred refinement of the invention, provision is made for the switching unit and the closing resistor unit to be arranged next to one another. In this case, provision is made in particular for the two units to have substantially the same height in relation to the frame/the base.
According to a further preferred refinement of the invention, provision is made as an alternative or in addition for the switching unit to be arranged above the closing resistor unit. As a result, a large amount of surface area is not required.
As an alternative to this, provision is advantageously made for the closing resistor unit to be arranged above the switching unit. As a result, a large amount of surface area is not required either.
According to yet another preferred embodiment of the invention, the switching unit and the closing resistor unit each have their own housing. In this case, the housings are configured such that one housing (switch housing) can be clearly associated with the switching unit and the other housing (closing resistor housing) can be clearly associated with the closing resistor unit.
In this case, provision is made in particular for the interiors of the housings to be connected to one another by means of at least one cross connection, that is to say a housing cross connection. A common gas area is produced in this way.
According to a preferred refinement of the invention, provision is made for the coupling device to have a coupling mechanism. The corresponding coupling is therefore a mechanical coupling.
In this refinement, provision is made in particular for the coupling mechanism to have at least one lever and/or at least one linkage and/or at least one shaft.
Exemplary embodiments of the invention will be shown in drawings below and described in more detail in the text which follows. In the drawings:
The longitudinal axis 20 of the switching unit 12 and the longitudinal axis 28 of the closing resistor unit 22 are oriented in parallel and in so doing are spaced apart from one another. In other words, the longitudinal axes 20, 28 of the switching device 14 and of the closing resistor arrangement 24 have an axis offset A.
Furthermore, the high-voltage circuit breaker 10 has a coupling device 30 which couples the operation of the closing resistor arrangement 24 to operation of the switching device 14. To this end, the coupling device 30 leads from the switching unit 12 to the closing resistor unit 22 and is configured as a coupling mechanism 34. For the purpose of compensating for the axis offset A between the longitudinal axes 20, 28 of the switching unit 12 and of the closing resistor arrangement 22, the coupling device 30 runs substantially perpendicularly to these axes 20, 28. The interiors of the two housings 16, 26 are connected to one another via cross connections 32, that is to say housing cross connections. A common gas area is produced in this way. The cross connections 32 allow corresponding electrical contact connections between components of the two units 12, 22.
Unlike in the prior art mentioned at the outset, the switching device 14 and the closing resistor arrangement 24 are not arranged coaxially one behind the other on a common axis by way of their longitudinal axes 20, 28, but rather next to one another in a compact manner. Given a compact arrangement of this kind next to one another, the two units (switching unit and closing resistor unit) 12, 22 are therefore arranged next to one another in relation to their longitudinal axes 20, 28.
An operating element 36 for operating the switching device 14 is provided in the housing 16 of the switching unit 12, which operating element is axially movable in relation to the longitudinal axis 20 of the switching device 14. An actuating element 38 for operating the closing resistor arrangement 24 is provided in the housing 26 of the closing resistor unit 22, which actuating element is substantially axially movable in relation to the longitudinal axis 28 of the closing resistor arrangement 24. The coupling mechanism 34 has levers 40 and a linkage 42 between the levers 40. Said coupling mechanism therefore has a certain degree of similarity to a conventional wiper linkage of a windscreen wiper in an automobile.
In the variant shown in
Here, in
The high-voltage circuit breaker 10 furthermore has a frame 48 which carries the switching unit 12 and the closing resistor unit 22 (or alternatively some other base for the two units 12, 22). The terms “above”, “below” or “next to” for describing the arrangement of the units 12, 22 are then clearly defined with respect to this frame 48.
In the example of
The switching unit 12 and the closing resistor unit 22 are arranged next to one another in the example of
In this example, the two units 12, 22 are connected to one another by means of intermediate elements 50 and are each connected to a bushing 46. The intermediate elements 50 are a kind of T-shaped cross connection 32 which each allow the additional connection of a bushing 46.
Some aspects of the invention will be explained once again below with reference to the examples shown in other words:
A very compact circuit breaker 10 is formed owing to the non-coaxial arrangement of the switching unit 12 and the closing resistor unit 22. The highest “packing density” is achieved by the parallel arrangement of the switching unit 12 and the closing resistor unit 22 in a dedicated tank. The two units 12, 22 can be positioned differently in relation to one another, wherein each individual installation position has positive and somewhat problematical aspects.
Example of
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Example of
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Example of
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Example of
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| Number | Date | Country | Kind |
|---|---|---|---|
| 1 02018 205 910.1 | Apr 2018 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2019/052227 | 1/30/2019 | WO | 00 |
