Patent Application
20220375674
The invention relates to a cover unit for a converter head of a high-voltage converter device, comprising a flat, preferably planar, cover element and an RIV shielding device that peripherally surrounds the cover element for shielding radio interference voltage.
The invention further relates to a corresponding converter head with a cover unit and a corresponding high-voltage converter device with a base, a converter head and a support insulator between the base and the converter head.
The datasheet of the inductive open-air voltage converter, type EGF, manufactured by PFIFFNER (datasheet 2017 April) describes this voltage converter as an SF6-gas insulated, high-voltage converter device with a base, a converter head and a support insulator between the base and the converter head. The active part of the voltage converter is located in a pressure-resistant housing of the base. The converter head comprises a cover unit with a plate-shaped cover element, an RIV shielding device that circumferentially surrounds the cover element for shielding radio interference voltage, and connection lugs arranged at the edge of the cover element as a “primary connection”. A terminal box, and attachment structures designed as what are known as lifting eyes, are furthermore arranged at the base. Converter devices of this sort are employed in high-voltage switchgears of 245-550 kV. They convert high voltages into standardized equivalent values for counters, measurement and protection devices. The RIV shielding device here is designed as what is known as a head toroid.
Shielding toroids of this sort, which are manufactured by rolling closed toroidal aluminum tube rings, and which are fastened as single or double toroids to the converter head by means of welded fastening elements, are very expensive and complex to manufacture.
These toroids, furthermore, as a result of their size and shape, cannot be mounted before the converter device is erected, and run as an additional auxiliary part in addition to the transport of the converter device itself. Additional costs, both logistical and associated with assembly, arise for the manufacturer as a result of this separation, since an additional shipment, with packing, has to be organized, along with additional fitters on the building site to assemble these toroids.
The invention is based on the object of providing measures through which the assembly of the corresponding high-voltage converter device can be simplified.
The object is achieved according to the invention by the features of the independent claims.
Advantageous embodiments of the invention are the objects of the dependent claims.
In the cover unit according to the invention for a converter head of a high-voltage converter device, which comprises a flat, preferably planar, cover element and an RIV shielding device for shielding radio interference voltage that circumferentially surrounds the cover element, it is provided that the RIV shielding device is formed by a plurality of RIV shielding elements distributed peripherally on the edge of the cover element, wherein said elements each have a substantially cylindrical shape, in particular a capsule shape. The structure of these RIV shielding elements is relatively simple, and they are therefore, on the one hand, easy and economical to manufacture and, on the other hand, can be handled easily. If the RIV shielding elements are arranged in an annular structure which surrounds the edge of the cover element in a manner which, while it does have gaps, is nevertheless relatively complete, an RIV shielding can be achieved that is comparable to the shielding that can be achieved by means of a shielding toroid, i.e. the head toroid explained at the beginning.
According to one preferred embodiment of the invention, the RIV shielding elements are each mounted on the cover element in such a way that they can be repositioned, in particular can be rotated. In this way it is ensured that large parts of the cover element are easily accessible from the outside, even when the shielding elements are preassembled.
According to a further preferred embodiment of the invention, at least one attachment structure is provided, arranged at the edge of the cover element, designed in particular as an opening or eye structure. In this context, the term “attachment structure” is to be understood analogously to the terms “attachment means” and “attachment point”. Attachment means and attachment points are the connection between a load and a means of carrying, such as a crane hook.
Attachment lugs are often provided on this type of cover unit for high-voltage converter devices. In a preferred embodiment of the cover unit according to the invention, at least one attachment lug is provided, arranged at the edge of the cover element.
It is preferably provided here that the cover unit comprises at least one further RIV shielding element for shielding radio interference voltage arranged at the edge of the attachment lug or at least one of the attachment lugs. This shielding then relates to the respective connecting lug, but can, however, also be thought of as part of the RIV shielding device.
According to yet another preferred embodiment of the invention, the RIV shielding elements can be repositioned/rotated in such a way that they
(i) shield the cover element in a first arrangement and
(ii) in a second arrangement, expose the at least one attachment structure and/or the at least one attachment lug for ease of handling, in particular over a large area. Although there is no shielding effect, or not a full one, in this position, the handling of the attachment structure or the attachment lug is itself not performed when the high-voltage converter device is in operation.
The cover element is preferably plate-shaped, i.e. designed as a plate. This is common, proven practice.
It is advantageously provided that the cover element has a rectangular, in particular square, base area, wherein the RIV shielding elements are attached to the sides of this base area, and the RIV shielding elements, when in use as the RIV shielding device, extend with their longitudinal axis along the sides of this base area. In a very simple case, the cover element here is designed as a plate with a rectangular, in particular square, base area.
In the converter head according to the invention for a high-voltage converter device that comprises a cover unit with a flat, preferably planar, cover element and an RIV shielding device circumferentially surrounding the cover element for shielding radio interference voltage, it is provided that the cover unit is designed as the cover unit referred to above.
In the high-voltage converter device according to the invention, with a base, a converter head and a support insulator between the base and the converter head, it is provided that the converter head is designed as the converter head referred to above.
In a preferred embodiment of the high-voltage converter device according to the invention, it is provided that the base comprises further attachment structures. This too is common, proven practice.
The base in particular comprises a base plate and a housing mounted thereon, in which an active part of the high-voltage converter device, a type of transformer, is located. A terminal box can, furthermore, be arranged laterally at the housing of the base.
Said further attachment structures are preferably located on the base plate of the base. These are, in particular, designed as fixing eyes, i.e. also as a type of eye or opening structure.
Altogether, the following advantages emerge:
This results in a minimization of costs for components and assembly.
The properties, features and advantages of this invention, described above, as well as the manner in which this is achieved, will be understood with greater clarity and meaning in connection with the following description of exemplary embodiments, which are explained in more detail in association with the drawings. In the drawings:
On the right-hand side,
The converter head 14, with the cover unit 24, is shown in detail on the left-hand side of
In the two corners of the cover element 26 that are not “occupied” by attachment lugs 26, openings 38 extend through the plate-shaped cover element 26. These openings 38 serve as attachment structures 40 for the transport and manipulation of the high-voltage converter device 10 during assembly. In this context, the terms eyes or opening structures may also be used. Further attachment structures 42 are located at the base plate 18 of the base 12. These are designed as fixing eyes, i.e. also as a type of eye or opening structure.
The base plate 18 also has a square base area, and the plate-shaped cover element 26 and the base plate 18 are aligned parallel to one another, although mutually rotated through 45°.
Converter devices 10 of this sort are employed in high-voltage switchgears of more than a hundred kilovolts. They convert high voltages into standardized equivalent values for counters, measurement and protection devices. The RIV shielding device 28 with the individual RIV shielding elements 34 now replaces the otherwise usual shielding device in the form of what is known as a head toroid.
Whereas, in the first arrangement shown in
New or improved possibilities for transport and assembly of the high-voltage converter device 10 emerge in this way.
The high-voltage converter device 10 can now be fastened, or is fastened, in/at the transport device by this attachment structure 38 and a transport fastening 50 fixed to the floor of the transport device.
To assemble the high-voltage converter device 28, it must first be lifted off the floor of the transport device. This can, for example, be done by means of a suspension 52 formed by a carrying harness. In addition to the other of the two attachment structures 38 of the plate-shaped cover element 26, this also uses one or a plurality of the further attachment structures 42 at the base 12.
The carrying harness comprises, for example, flexible carrying elements in the form of ropes, chains, belts etc. that fasten the attachment structures 38, 42 of the high-voltage converter device 10 to a central suspension point 54.
In this way, the high-voltage converter device 10 can, for example, be held and/or moved by a crane hook.
Altogether, the following advantages result:
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 214 006.8 | Sep 2019 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/072840 | 8/14/2020 | WO |
