WO2021093944A1

WO2021093944A1 - Bushing arrangement and converter system having the bushing arrangement

Info

Publication number: WO2021093944A1
Application number: PCT/EP2019/081102
Authority: WO
Inventors: Achim Langens
Original assignee: Siemens Energy Global GmbH & Co. KG
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2021-05-20
Also published as: CN218299484U

Abstract

The invention relates to a bushing arrangement comprising a bushing for leading an electrical line through a wall, comprising an internal conductor and an insulating body which surrounds the internal conductor. The invention is distinguished by an insulator, the first axial end of which is connected to an outdoor-side end of the bushing and the second axial end of which is designed for fastening to the wall. The invention further relates to a transformer arrangement and also to a converter arrangement having the bushing arrangement.

Description

description

Bushing arrangement and converter system with the bushing arrangement

The invention relates to a bushing arrangement comprising a bushing for passing an electrical line through a wall, which has an inner conductor and an insulating body surrounding the inner conductor. The inner conductor passed through the insulating body extends, for example, between an open-air end and an oil-side end of the bushing. Such a lead-through arrangement is usually used to connect the inner conductor, which is at high voltage potential when the lead-through arrangement is in operation, ie at a potential of over 1 kV or even over 100 kV or over 500 kV, through a wall that is at ground potential to lead. The bushing is designed to isolate the corresponding voltage. For example, in the case of a transformer bushing, the wall can form a housing (tank) of a transformer. The wall can also be part of a wall of a converter hall, for example. The bushing arrangement is usually part of a high-voltage system with several high-voltage components such as converters, transformers or switchgear.

Bushing arrangements of the above type are often used in regions where earthquake safety can be a design factor. As the voltage to be isolated increases, the weight and the external dimensions of the implementation, in particular its length, also increase. This also increases the susceptibility of the implementation arrangement to seismic requirements. A remedy can be achieved by increasing the mechanical strength of the bushing (for example, the inner conductor can be made thicker). At high voltages to be isolated the conventional design of the implementation reaches its limits due to its very high weight, among other things.

The object of the invention is to propose an appropriate implementation arrangement that is as inexpensive and reliable as possible with regard to seismic requirements.

The object is achieved with a bushing arrangement according to the invention by an insulator, the first axial end of which is connected to an end of the bushing on the open air side and the second axial end of which is set up for fastening to the wall, in particular so that at least a part of the bushing arrangement is in operation weight force acting on the implementation is transmitted to the wall by means of the isolator. The bushing is therefore braced on the open air side with one or more electrically insulating insulators to the wall. In this way, the seismic stability of the implementation arrangement can be increased without having to further increase the weight of the implementation. This also results in a corresponding cost advantage.

The insulating body of the bushing preferably comprises dry insulation with a resin. The insulating body can in particular comprise concentrically arranged insulating layers, for example wound onto the inner conductor or a winding carrier, which are impregnated with the resin. The insulating layers can, for example, comprise a paper or a nonwoven fabric. The insulating layers can be separated from one another by conductive capacitive control inserts. Such implementation has advantages in terms of dielectric strength and handling. Due to the high weight of the resin body, the seismic stability mentioned can be achieved particularly efficiently by means of the bracing with the at least one insulator. According to one embodiment of the invention, the implementation arrangement comprises a damping system by means of which the insulator can be attached to the wall, the damping system being set up to dampen relative movements between the wall and the implementation. In this way, vibrations and oscillations that can occur, for example, in an earthquake, can be efficiently damped, so that the stress on the bushing body can advantageously be reduced. The damping system can, for example, be rigidly connected to the wall during operation of the implementation arrangement, while the at least one insulator is movably connected to the damping system.

The damping system can include at least one damping spring, preferably a spring package with several damping springs. The damping springs represent a particularly simple and reliable way in which the damping can be implemented. Alternatively or in combination, hydraulic dampers can also be provided, for example.

The insulator is preferably a rod insulator. It suitably comprises a rigid, elongated body made of an electrically insulating material. At both axial ends, the rod insulator expediently has fastening means, for example mechanical fastening means for fastening the rod insulator to the bushing and the wall. With means of the rod insulator, the power transmission or the damping can be implemented particularly effectively.

A plurality of insulators can suitably be provided, each of the insulators being connected to the bushing at one end and being attachable to the wall at the other end. For example, all isolators can be constructed in the same way, for example in the form of rod insulators. The insulators can be attached to the wall by means of the damping system. According to one embodiment of the invention, the implementation is a transformer bushing. The transformer implementation is connected at its transformer-side end to a transformer winding of a transformer. The transformer bushing is arranged at an angle between 5 ° and 85 ° with respect to a substrate on which the transformer is installed. In this inclined arrangement, the bracing of the bushing is particularly effective.

According to a further embodiment of the invention, the bushing is a wall bushing that has a free air-side end on both sides, with at least one further insulator being provided, the first axial end of which is connected to the further open-air end of the bushing and the second axial end for fastening to the Wall is set up. The wall bushing leads the inner conductor through, for example, a wall of a valve hall of a converter system. In this case, the two ends of the wall duct on both sides of the wall by means of the isolators are tensioned to increase the seismic stability.

The invention also relates to a transformer arrangement with a transformer. The transformer can be a high-voltage transformer, for example.

The object of the invention is to provide such a transformer gate arrangement that is as reliable and inexpensive as possible with regard to seismic stability.

The object is achieved according to the invention by a transformer arrangement with a transformer in which at least one transformer winding of the transformer is led out of a transformer housing of the transformer by means of a lead-through arrangement according to the invention and passed through a wall. The invention further relates to a Stromrichteranord voltage with a converter which is arranged in a converter hall that is at least partially limited by a wall.

The object of the invention is to provide such a Stromrichteran order that is as reliable and inexpensive as possible with regard to seismic stability.

The object is achieved in a type of converter arrangement in that at least one converter line is passed through the wall by means of a bushing arrangement according to the invention.

The advantages of the transformer arrangement according to the invention and the converter arrangement according to the invention result in particular from the advantages that were previously described in connection with the lead-through arrangement according to the invention.

In general, a wall is understood as an at least partial delimitation of an interior space or delimitation of two rooms. Therefore, the wall can comprise several elements, such as, for example, a mainly vertically extending side wall or also a mainly horizontally extending ceiling wall which delimits a space at the top.

The insulator can therefore be directed within the scope of the invention for fastening conditions on the side wall or on the top wall. In particular, in a transformer arrangement or converter arrangement according to the invention, the at least one insulator of the bushing arrangement can be attached to the side wall and / or to the top wall.

The invention is explained further below with reference to the exemplary embodiments shown in FIGS. 1 to 3. FIG. 1 shows an exemplary embodiment of a bushing arrangement according to the invention in a transformer arrangement in a schematic representation;

FIG. 2 shows an exemplary embodiment of a bushing arrangement according to the invention in a converter arrangement in a schematic representation;

Figure 3 shows a further embodiment of a lead-through arrangement according to the invention in a schematic representation.

In Figure 1, a transformer arrangement 1 is shown. The transformer arrangement 1 comprises a high-voltage transformer 2 with a transformer winding 3. A bushing arrangement 5 is provided to guide the transformer winding 3 through a boiler wall or transformer housing 4 of the transformer 2. The bushing arrangement 5 comprises a bushing 6. The bushing 6, which is a high-voltage bushing in the example shown, is set up to isolate voltages above 300 kV. The bushing 6 comprises an inner conductor 7 which is surrounded by an insulating body 8. The bushing 6 has an end 9 on the transformer side, at which the inner conductor 7 is electrically connected to the transformer winding 3. At the transformer-side end 9, a corona ring 10 is net angeord. Furthermore, the bushing 6 has an end 11 on the open air side. The end 11 on the open air side is located higher than the end 9 on the transformer side with respect to a subsurface 12.

The bushing arrangement 5 further comprises a Stabisola gate 13. When the bushing arrangement 5 is in operation, the rod insulator 13 extends between the open-air end 11 of the bushing 6 and a wall 14 through which the bushing 6 is passed. Means of suspension 15 is the rod insulator 13, at its first axial end 131 connected to the bushing 6. A second axial end 132 of the stabilizer 13 has fastening means 17 for fastening to the wall 14.

The lead-through arrangement 5 further comprises a damping system 16 which is arranged on the wall 14. The damping system 16 comprises a spring assembly which is connected to the rod insulator 13 by means of suitable fastening means 17. The spring assembly is designed in such a way that Relativbe movements between wall 14 and transformer 2 can be damped.

A converter arrangement 20 is shown in FIG. The converter arrangement 20 comprises a converter with a converter valve 21 which is connected between an AC voltage line 22 and a DC voltage line 23. The converter valve 21 is arranged in a valve hall 24 which is delimited by a wall 25. In order to guide the DC voltage line 23 through the wall 25, a bushing arrangement 26 is provided.

The leadthrough arrangement 26 comprises a wall leadthrough 27. The wall leadthrough 27 has a first end 28 on the open air side, which is located when the leadthrough arrangement is in operation

26 is located in the valve hall 24. Furthermore, the wall duct 27 has a second open-air end 29, at which the wall duct 27 is verbun with an overhead line 30. The bushing arrangement 26 further comprises a first rod insulator 31 and a second rod insulator 32. The first rod insulator 31 is connected to the first end 28 on the open air side. The second rod insulator 32 is connected to the second end 29 on the open air side. Both the first and the second rod insulator 31 and 32 are fastened to the wall 25 by means of mechanical fasteners 33 and 34, respectively. The rod insulators 31, 32 are with the wall bushing

27 connected in such a way that during operation of the bushing arrangement At least part of a weight force acting on the implementation is transmitted to the wall by means of the insulator. In this way, the seismic stability of the bushing arrangement 26 and thus also of the converter arrangement 20 can advantageously be increased.

In the exemplary embodiment shown in FIG. 3, a wall 51 comprises a side wall 52 and a top wall 53. A bushing arrangement 50 comprises a bushing 54 which, in the example shown, is a transformer bushing that interacts with the transformer 2. The bushing 54 is mechanically connected at the end 55 facing away from the transformer 2 to the first end 57 of an insulator 56, the second end 58 of which is fastened to the top wall 53 in order to increase the seismic stability of the bushing arrangement 50.

Claims

1. Bushing arrangement (5) with a bushing (6) for passing an electrical line through a wall (14) which comprises an inner conductor and an insulating body (8) surrounding the inner conductor (7), characterized by at least one insulator (13), whose first axial end (131) is connected to an open-air end of the implementation and whose second axial end (132) is set up for fastening conditions on the wall (14).

2. bushing arrangement (5) according to claim 1, wherein the Iso lierkörper (8) comprises a dry insulation with a resin.

3. Bushing arrangement (5) according to one of the preceding claims, wherein the bushing arrangement (5) comprises a damping system (16) by means of which the insulator (13) can be attached to the wall (14), the damping system (16) for damping of relative movements between the wall (14) and the implementation (6) is set up.

4. bushing arrangement (5) according to claim 3, wherein the damping system (16) comprises at least one damping spring.

5. bushing arrangement (5) according to one of the preceding claims, wherein the insulator (13) is a rod insulator.

6. Bushing arrangement (5) according to one of the preceding claims, wherein a plurality of insulators (31, 32) is easily seen, each of the insulators being connected at one end to the bushing (6) and at the other end to the wall (14) ) can be fastened.

7. bushing arrangement (5) according to one of the preceding claims, wherein the bushing (6) is a transformer implementation.

8. bushing arrangement (5) according to any one of the preceding claims 1 to 6, wherein the bushing (6) is a wall bushing (27) which has an open-air end (28, 29) on both sides, a further insulator being provided, the first of which axial end is connected to the other Freiluftsei term end of the implementation and the second axial end is set up for attachment to the wall.

9. Transformer arrangement (1) with a transformer (2), characterized in that at least one transformer winding (2) of the transformer (2) from a transformer housing (4) of the transformer (2) by means of a bushing arrangement (5) according to one of the preceding claims is led out and passed through a wall (14).

10. Transformer arrangement (1) according to claim 9, wherein the wall (51) comprises a side wall (52) and a top wall (53), wherein the at least one insulator of the implementation arrangement (50) is attached to the side wall and / or to the top wall is.

11. converter arrangement (20) with a converter (21) which is arranged in a converter hall, which is at least partially limited by a wall (25), characterized in that at least one converter line (23) by means of a guide arrangement (26) according to a of the preceding claims 1 to 8 is passed through the wall (25).

12. Converter arrangement (20) according to claim 11, wherein the wall (51) comprises a side wall (52) and a top wall (53), wherein the at least one insulator of the through- guide arrangement (50) is attached to the side wall and / or to the top wall.