WO2019114933A1

WO2019114933A1 - High-voltage feedthrough

Info

Publication number: WO2019114933A1
Application number: PCT/EP2017/082450
Authority: WO
Inventors: Christian Paul; Sebastian Sendobry; Engelbert Engels; Achim Langens; Joachim Titze
Original assignee: Siemens Aktiengesellschaft
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2019-06-20
Also published as: EP3711071A1; CN213546021U

Abstract

The invention relates to a high-voltage feedthrough (1) having an internal conductor (2) which extends in a longitudinal direction between a first and a second high-voltage terminal (3, 4) of the high-voltage feedthrough, and having an insulating body (5) which at least partially encloses the internal conductor, wherein the insulating body comprises field-controlling control inlays (27a-e) in a control inlay region (26) which are separated from one another by insulating layers. The invention is distinguished by at least one electrode element (12a) which is electrically connected to at least one of the control inlays and is led axially out of the control inlay region.

Description

High-voltage bushing

The invention relates to a high-voltage bushing with egg nem inner conductor which extends in a longitudinal direction between egg nem first and second high voltage terminal of the high voltage implementation, as well as with a Isolierkör, which surrounds the inner conductor at least partially, where in the insulating body in a control pad area angeord designated comprising electric field controlling control inserts which are separated from each other by insulating layers, and wherein the control inserts are suitably arranged concentrically around the inner conductor.

In general, such a high-voltage bushing has the task of isolating the lying during operation of the high-voltage bushing on egg nem high voltage potential inner conductor of the high voltage implementation of a ground potential environment, such as a wall of a Hochspannungsan. The voltage differences to the ground potential amount to, for example, more than 300 kV, in particular more than 600 kV. For this purpose, the inner conductor is passed through the insulating body. The embedded in the insulating conductive control inserts are used to control the electrical's field, so that a homogenization of the electrical stress is achieved radially and axially within and also outside half of the insulator. In this way, critical electrical loads on the surface and within the insulator can be avoided or at least reduced.

Such a high-voltage bushing is known from WO

2015/172806 Al known. The insulating layers of the known high-voltage bushing comprise resin-impregnated crepe paper.

The control pad area is that area of the insulating body in which the control inserts are arranged. Usually, the control pad area extends along a part of the inner conductor. The high voltage connection is in Generally understood as a suitably trained connection point, which is suitable for connection to other power lines.

In general, the axial control path of the high-voltage bushing, ie in particular the length of the Iso lierkörpers depends on the voltage to be isolated. The higher the voltage to be insulated, the longer the insulating body must be designed in order to achieve a uniform permissible electrical load along the longitudinal direction of the high-voltage bushing. The material costs therefore increase with the voltage to be isolated. Likewise, it would be necessary to provide appropriate production facilities and assembly halls in order to be able to produce the necessary structural lengths. In addition, large lengths require cost-intensive adaptations with regard to mechanical, for example seismic, stress.

The object of the invention is thus to propose an art high voltage implementation, the cost is as low as possible and easy.

The object is achieved in such a high-voltage bushing by at least one electrode element which is electrically connected to we least one of the control inserts and led out of the control point area axially.

Accordingly, a conductive, low-resistance electrode element is electrically connected to a defined control insert of the field control of the insulating body lierkörpers. The field control can be, for example, capacitive and / or resistive. The Potenzi al can thus be moved axially by means of the electrode element in the desired position. This can advantageously be a comparison of the electrical stress on the high voltage bushing and its environment can be achieved. In within the electrode element and outside of the control unit gene genbereich results in a largely cylindrical electrical cal field to the inner conductor. This field passes through the Potential shift only at an axially the Steuerereinlagebe rich opposite end of the electrode element. The connection of the at least one electrode element to the control insert can take place, for example, by means of a suitable potential tap. The Potentialanzapfung can un ter using suitable conductive components, such as example of a copper strip, be realized. The mechanical attachment of the electrode element may conveniently be provided un ter using the insulating body.

The high-voltage bushing according to the invention is applicable both in stationary electric fields (DC), quasi stationary electric fields (AC) as well as in shock processes.

An advantage of the high-voltage feedthrough according to the invention is that the control insert area of the insulating body can be shortened axially by the use of the electrode element. In this way, the previously described surrounded disadvantages, for example, due to the high weight of the insulator and thus the high voltage implementation can be avoided. In addition, new applications can be made possible with the high-voltage bushing according to the invention, for. B. in the voltage range above 1000 kV.

Preferably, the electrode element is at least partially cylindrical, conical or the like and extends in the longitudinal direction of the high-voltage bushing and concentric with the inner conductor. With this embodiment of the electrode element, a particularly advantageous field distribution can be achieved.

Preferably, the electrode element at its end facing away from the control of the control area has a rounding to Vermei tion of field strength peaks. By means of the rounding, disadvantageous field strength peaks at the end of the element element can be avoided. As a rounding is in this Related to each rounded profile, eg. B. also in the sense of a person skilled in the known Rogowski profile.

According to one embodiment of the invention, a further electrode element is provided, wherein the two Elektrodenele elements are arranged opposite each other to or in Be rich of the two axial ends of the control insert area, wherein both electrode elements in the longitudinal direction of the high voltage feedthrough and concentric with the inner conductor extend. In this way, the insulating body or the control pad area can be made shortened at both ends. Such an embodiment is particularly advantageous if the Hochspannungsdurchfüh tion is a wall feedthrough, wherein the two high voltage voltage connections are external terminals for connecting to a respective high voltage conductor. The outer terminals may be, for example, outdoor connections. The two electrode elements can be constructed identically. In particular, in this case the further electrode element is also led out of the STEU ereinlagenbereich the insulating body axially. The high-voltage conductor can bespielsweise part of an open-air line or a busbar or the connection of both.

Usually, the insulating body comprises a single Wi ckelkörper, the ereinlagen wound on a winding core STEU and insulating layers is formed. According to one embodiment of the invention, the insulating body comprises two con centric winding bodies. The electrode element is led out genbereich at a junction of the bobbin from the Steuerereinla genbereich. The two winding bodies can be pushed into one another, for example, in the manufacture of the high-voltage bushing. The electrode element may for example be secured mechanically at a location between the winding bodies.

The high-voltage bushing can be designed as a plug-in high voltage bushing. In addition, the high- Voltage feedthrough a plug-in section, which is set for A stuck the high-voltage feedthrough in a device connection part of an electrical device, wherein the control inserts extend into the plug portion. The electrical device may be, for example, a high voltage transformer. The plug-in portion of the high-voltage bushing and the device connector are designed so staltet that a reliable electrical contact between the inner conductor of the high-voltage bushing and the device is produced connecting part, wherein the device connecting part with other elements of the electrical device, such as in a housing arranged Trans transformer winding , is electrically connected. At the same time, the connection at the interfaces between the device connection part and the plug-in section has sufficient dielectric strength, so that operation at high voltage level is possible. The control inserts extend into the plug portion of the high voltage feedthrough. In this way, the electric field can also be effectively controlled in the plug-in area, so that the sensitive area of the connection between the device connection part and the high-voltage feedthrough has improved electrical properties.

Preferably, the insulator further comprises a hardened resin. For example, the high-voltage feedthrough during the manufacturing process, for example, after winding the insulating layers, ge be soaked with a thermosetting resin. After curing of the resin can thus be obtained an improved electrically insulating insulator. The insulating body with the resin as the main insulator is in the form of a compact block. Advantageously, according to this embodiment of the insulating body as a solid block provides a mechanical support for the inner conductor of the high-voltage bushing. In this way, a bending of the inner conductor due to the own weight avoided or reduced ver. The inner conductor supported by the insulating body can thus always along the length thereof provide the intended radial distance to the electrode element. so that the electrical properties are not adversely affected by a possible bending of the inner conductor. Similarly, the insulating body also serves as a mechanical support member for the Elektrodenelemen te.

According to a further embodiment of the invention, the high-voltage feedthrough on an outer housing which surrounds the insulating body outside at least partially, wherein the housing is at least partially made of a composite material, wherein a secondary insulation is provided between the housing and the insulating body. The secondary insulation preferably comprises an insulating gas. Suitable insulating gases are for. B. SF ₆ or air under high pressure. The composite may be, for example, a fiber reinforced plastic. Preference, the housing element consists of glass fiber reinforced plastic, whereby a particularly high stability is guaranteed guaranteed. According to a variant of the invention, the housing element may be a tube made of glass fiber reinforced plastic. On the tubular housing member may further be mounted an outer insulation, for example, comprises ring-shaped silicone screens.

The insulating layers of the insulating body may include paper. The insulating layers can also be taken gefer from a plastic. For example, the insulating layers may comprise a plastic non-woven fabric, which preferably consists of so-called endless filaments.

The invention will be further explained below with reference to embodiments shown in Figures 1 to 3 who the.

Figure 1 shows a first embodiment of inventions to the invention high-voltage bushing in a schematic cross-sectional view; Figure 2 shows a second embodiment of a erfindungsge MAESSEN high-voltage bushing in a schematic

Cross-sectional view;

Figure 3 shows an enlarged partial view of the high-voltage bushings of Figures 1 and 2 in a schematic cross-sectional view.

FIG. 1 shows a high-voltage bushing 1. The high voltage bushing 1 is designed as a wall bushing. This serves to carry out a high-voltage conductor lying in operation at a high voltage of, for example, more than 500 kV through a wall or wall. For example, this is the wall of a HVDC building.

The high-voltage feedthrough 1 comprises an inner conductor 2 which is connectable both at a first axial end 3 and at a second axial end 4 of the high-voltage feedthrough 1 to the high-voltage conductor (which is not explicitly illustrated in FIG. The high voltage conductor can because at z. B. part of an open air line or a supply line to a transformer winding or a valve group.

The inner conductor 2 is partially enclosed by a spindle-shaped insulating body 5. The insulating body 5 comprises control inserts 27a-e, which are shown in more detail in FIG. The control inserts 27a-e are arranged concentrically around the inner conductor 2 (concentric are generally also understood to mean those control inserts which, as a result of the production, are arranged almost concentrically). The control inserts are used for capacitive and / or resistive field control. They are separated from each other by insulating layers comprising paper or egg nen plastic, such as a plastic nonwoven fabric. The insulating layers are wound on the inner conductor 2. In general, the insulating layers can also be wound up on a separate remaining or removable roll carrier. The insulating body 5 is soaked in a resin after winding the insulating layers and cured, so that the insulator forms a compact block which mechanically supports the inner conductor 2. The insulating body 5 is often referred to times as the main insulation. The region of the Iso lierkörpers 5, in which the control inserts are arranged, is referred to as a control insert portion 26 (see Figure 3).

The high-voltage feedthrough 1 further comprises a fastening supply flange 6 for fastening the high-voltage feedthrough to the earth wall or wall. The mounting flange 6 engages mechanically, for example by means of a clamping connection, directly on the insulating body 5.

The high-voltage bushing 1 is permitted with a housing 7 from. The housing 7 may, for example, at least in part consist of a composite material, example, of a fiber-reinforced plastic. In a inter mediate space 8 between the housing 7 and the insulating body 5, a secondary insulation 9 is arranged, which consists for example of an insulating gas such as SF ₆ . Outside the housing 7, an outer layer in the form of silicone shades 13 is attached.

At the two axial ends 3, 4 of Hochspannungsdurchfüh tion 1 are two shielding electrodes 10 and 11 for wei direct field shield.

The high voltage feedthrough comprises a first electrode element 12a and a second electrode element 12b. The two electrode elements 12 a and 12 b are cylindrical and con centric to the inner conductor 2 is arranged. Both Elektrodenele elements 12 a and 12 b are electrically connected to one of the Steuereinla and mechanically connected to the insulating body. Each of the electrode elements 12 a and 12 b is led out axially from the Isolierkör by 5. In this case, the first electrode element 12a is led out in the direction of the first axial end 3 and the second electrode element 12b in the direction of the second axial end 4 out of the insulating body 5. In particular, each of the two electrode elements 12a and 12b extends axially beyond the conically tapering ends 5a and 5b of the isotope. lierkörpers 5 addition. The insulating body 5 forms a mechanical African support for the electrode elements 12 a, b.

Each of the two electrode elements 12a and 12b has at one of their ends a rounding 14a or 14b, which serve to avoid field strength peaks.

Figure 2 shows a further high-voltage bushing 15, which is designed as a device feedthrough. The high-voltage bushing 1 of Figure 1 and the high-voltage bushing 15 are constructed partially similar. In order to avoid repetition, only their differences will be discussed below. In this case, the same and similar ele ments in the figures 1 and 2 with the same reference numerals ver see.

In contrast to the high-voltage bushing 1 of Figure 1, the high-voltage bushing 15 except a first axial end 3, which is also characterized in this case as Freiluftende be, a device-side end 16. At the device end 16 of the inner conductor 2 is led out of the Hochspannungsdurchfüh tion 15 and adapted to be connected to a conductor inside an electrical device, such as a high voltage transformer. For fastening movement of the high-voltage feedthrough 15 to a device housing of the electrical device, which is indicated in Figure 2 by means of a broken line 17, a mounting flange 18 is used.

The high-voltage bushing 15 has an open-air side to parent electrode element 12 a.

In Figure 3, an enlarged section of a high-voltage bushing passage 20 is shown. In the section shown in Figure 3, the Hochspanungsdurchführung 20 is identical to the two previously shown in Figures 1 and 2 high-voltage vias 1 and 15 executed. Therefore, the illustration of Figure 3 can also be used as an illustration of the corresponding chenden section of the high-voltage bushings 1 and 15 serve. For clarity, the same and similar components and elements of Hochspannungsdurchfüh ments 20, 1 and 15 are provided in the figures 1 to 3 with the same reference numeral Be.

The insulating body 5 comprises conductive control inserts 27a-e. It should be noted here that the number of control fins illustrated in FIG. 3 is an example, but that in principle it can be adapted as desired and adapted to the particular application. The control inserts are concentrated to each other and arranged to the inner conductor 2. They are separated from each other by insulating layers 28a-d, wherein the insulating layers are wound onto the inner conductor 2 (or on a winding core surrounding the inner layer), so that a winding body 22 is formed, which is resin-impregnated and cured in the manufacturing process. The control inserts 27a-e are each different in length, the length of the STEU ereinlagen with the radial distance from the inner conductor 2 decreases. The boundary of the control insert portion 26 within the bobbin 22, that is the range to which control inserts are provided in the bobbin 22 and extend axially, is in Figure 3 with a line gekennzeich net.

The electrode member 12 a is arranged with one end at the connec tion point 24 to the insulating body 5. The electric denelement 12a is electrically connected to the control insert 27b by means of a potential tap 25. The electrode element 12 a is also mechanically held by the resin body of the insulating body 5 in position.

Claims

claims

1. High voltage bushing (1) with

an inner conductor (2) which extends in a longitudinal direction between a first and a second high-voltage connection (3, 4) of the high-voltage feedthrough (1),

- An insulating body (5) which surrounds the inner conductor (2) at least partially, wherein the insulating body (5) in a control insert area (26) field control control inserts (27a-e), which are separated from each other by insulating layers (28a-d) ge .

marked by

at least one electrode element (12a) which is electrically connected to at least one of the control inserts and axially led out of the control insert area (26).

2. High-voltage bushing (1) according to claim 1, wherein the at least one electrode element (12 a) at least partially cylindrical and / or cone-shaped and extending in the longitudinal direction of the high-voltage bushing (1) and concentric to the inner conductor (2).

3. High-voltage bushing (1) according to claim 2, wherein the at least one electrode element (12 a) at its end of the control insert area (26) facing away from a rounded end (14 a,

14b) to avoid field strength increases.

4. High-voltage bushing (1) according to one of the preceding claims, wherein a further electrode element (12 b) is seen easily, wherein the two electrode elements (12 a, b) Einan the opposite to the two axial ends of the control insert area (26) are arranged, wherein extend both electrode elements (12a, 12b) in a longitudinal direction of the high voltage feedthrough (1) and concentric to Innenlei ter (2).

5. High-voltage bushing (1) according to claim 4, wherein the high-voltage bushing (1) is a wall bushing, where at the two high-voltage terminals (3,4) outer connec se for connecting to each one high-voltage conductor.

6. High-voltage bushing (1) according to one of the preceding claims, wherein the insulating body (5) comprises two concentric Wi ckelkörper (22a, 22b), and the electrode element (12a, 12b) at a connection point (24) of the winding body (22a, 22b) out of the control panel area (26) is led out.

7. high-voltage bushing (15) according to one of precede the claims, wherein the high-voltage bushing has a plug-in section, the voltage implementation for insertion of the high-voltage is set up in a device connecting part of a rule electrical device, wherein the control inserts extend into the plug portion.

8. high-voltage bushing (1) according to any one of the preceding claims, wherein the insulating body (5) further comprises a hardened tes resin.

9. high-voltage bushing (1) according to claim 8, wherein the insulating body (5) as a mechanical support element for the we least one electrode element (12 a, b) is used.

10. High-voltage bushing (1) according to any preceding the claims, wherein the high-voltage bushing (1) has an outer housing (7) which surrounds the insulating body (5) outside at least partially, wherein the housing (7) at least partially made of a composite material consists, between between the housing (7) and the insulating body (5) a side isolation (9), in particular a gaseous secondary insulation, is provided.