Coated conductors in high voltage equipment and methods for increasing dielectric strength

Abstract

The present invention relates to a high-voltage device (1) having an encapsulated housing (2) and at least one bushing (3) for at least one electrical conductor (4) leading into and / or leading out of the encapsulated housing (2), the at least one electrical conductor (4) being coated with an insulating layer (5), which increases the dielectric strength of the high-voltage device (1), particularly in the region of the bushing (3).

Description

[Technical Field]

[0001] The present invention relates to a high voltage apparatus and a method for increasing the dielectric strength in a high voltage apparatus, the high voltage apparatus comprising an encapsulated housing and at least one bushing for at least one electrical conductor leading into and / or leading out of the encapsulated housing.

[0002] High-voltage equipment is designed for voltages ranging from several tens of kilovolts to several hundred kilovolts, in particular for voltages of 1200 kV, and currents ranging up to several hundred kiloamperes. High-voltage equipment includes, for example, high-voltage switchgear, disconnectors, transformers, surge arresters, instrument transformers, and / or bushings. High-voltage equipment, in particular switchgear, is designed, for example, as outdoor switchgear and / or as gas-insulated switchgear, i.e., gas-insulated switchgear, which is designed as an insulator-type switchgear with switching units arranged in an insulator at high voltage potential, or as a tank-type switchgear with switching units arranged in a grounded housing.

[0003] A tank-type gas-insulated switchgear has an encapsulated housing, made of, for example, aluminum, designed in the shape of a cylindrical tank, and several bushings for electrical conductors, which connect the switching unit arranged inside the encapsulated housing to power consumers, generators, and / or power lines of a power grid. These electrical conductors are live conductors depending on the operating state during operation, for example, when the switchgear is closed and high voltage is applied. The encapsulated housing, especially in the tank shape, is designed gas-tight and has two openings, for example, designed in the shape of circular flanges, into which an insulating housing, especially a hollow cylindrical housing, is fixed gas-tight. In the insulating housing, i.e., the insulator, the electrical conductors extend from external connection terminals at the hermetically sealed housing ends to the openings of the encapsulated housing and through them to, for example, the switching unit, in order to electrically connect the switching unit to power consumers, generators, and / or power lines of a power grid.

[0004] The encapsulated housing of high-voltage equipment, particularly switchgear, is mounted on a support, for example, a steel mast, which is fixed in a mechanically stable manner to a concrete foundation. The encapsulated housing is electrically grounded to minimize danger to maintenance workers and / or bystanders. A particularly long, hollow, cylindrical insulator is disposed or fixed on the side of the encapsulated housing opposite the support, for example, perpendicular or at an angle to the encapsulated housing, particularly pointing upward from the encapsulated housing. This provides a sufficient electrical insulation distance of the connection terminals from ground potential and / or the foundation, preventing electrical flashover. The interior of the encapsulated housing and insulator are filled with insulating and / or insulating gas, particularly SF6.

[0005] This insulating gas insulates the interior of the high-voltage apparatus, such as the switchgear and the electrical or live conductors, from the grounded encapsulating housing. In the area of ​​the bushing, particularly in the area of ​​the transition from the circular flange-shaped opening of the encapsulating housing to the fixed, particularly hollow-cylindrical, insulator, sufficient dielectric strength must be ensured between the grounded encapsulating housing and the electrical conductors, particularly at high-voltage potential. If the openings in the encapsulating housing are circular, the electrical conductors are arranged equidistant from the encapsulating housing, particularly so that they penetrate perpendicularly through the circular plane of the opening at the center of the circle. Depending on the maximum voltage of the high-voltage apparatus and the insulating gas and its pressure used, these openings have a size or circumference that ensures sufficient dielectric strength, thereby reliably preventing electrical flashover between the conductors and the encapsulating housing.

[0006] The electric field or electric field peak in the region of the opening is changed or reduced, i.e., shielded, starting from the live conductor by a plurality of grounded electrodes, in particular by circular hollow cylindrical metal electrodes arranged inside the insulator and mechanically fixed to the flange of the encapsulating housing. This allows the application of high voltages, particularly in the range of several hundred kilovolts, in this high-voltage device without electrical flashover and / or short circuit occurring between the electrical conductor at high voltage potential, particularly in the bushing region, and the grounded encapsulating housing. The high voltage levels of the high-voltage device require large diameters of the openings in the encapsulating housing for long-term safe operation, which leads to high costs for insulators with large circumferences and the use of insulating gases with high dielectric strength, in particular SF6 and / or require high pressure of the insulating gas, which leads to high costs for large wall thicknesses of the insulator and encapsulated housing to ensure sufficient mechanical stability over time.

[0007] Barring gases such as SF6 are harmful to the climate. Alternative barrier gases, such as clean air, have lower dielectric strengths. The use of climate-friendly barrier gases such as clean air requires larger opening diameters in the encapsulated housing and / or higher barrier gas pressures, with the drawbacks mentioned above. Measures such as the use of multiple grounded control electrodes can only increase the dielectric strength insufficiently for certain voltage levels. This limits the use of high-voltage switchgear. Summary of the Invention [Problem to be solved by the invention]

[0008] The object of the present invention is to provide a high-voltage apparatus that overcomes the above-mentioned problems, and a method for increasing the dielectric strength in a high-voltage apparatus, particularly when using an alternative barrier gas such as clean air, in which the dielectric strength in the bushing area of ​​the high-voltage apparatus is high, allowing for higher voltage levels at advantageous costs and with material savings, especially when using a barrier gas with a low gas pressure, for example in the range of ambient air, and / or when the bushing diameter is comparable to or smaller than that of a high-voltage apparatus filled with SF6. [Means for solving the problem]

[0009] The above-mentioned problem is solved by a high-voltage device having the features of claim 1 and / or by a method according to claim 14 for increasing the dielectric strength of a high-voltage device, in particular the above-mentioned high-voltage device. Advantageous embodiments of the high-voltage device according to the invention and / or of the method according to the invention for increasing the dielectric strength of a high-voltage device, in particular the above-mentioned high-voltage device, are set out in the dependent claims. The subject matter of the two main claims can be combined with each other and with the features of the dependent claims, and the features of the dependent claims can be combined with each other.

[0010] The high-voltage device according to the present invention comprises an encapsulated housing and at least one bushing for at least one electrical conductor, the at least one electrical conductor being led into and / or led out of the encapsulated housing, the at least one electrical conductor being covered with an insulating layer.

[0011] This insulating layer allows the use of a bushing with a smaller diameter, particularly when a climate-friendly barrier gas such as clean air is used instead of a climate-harmful barrier gas such as SF6. High-voltage devices having at least one electrical conductor coated with an insulating layer can be manufactured in a cost-effective and material-saving manner, particularly because a bushing with a smaller diameter can be used when a climate-friendly barrier gas such as clean air is used, and at high voltage levels, a barrier gas with a low gas pressure, such as in the range of ambient air, with high dielectric strength in the bushing area of ​​the high-voltage device can be used, which allows for thin-walled encapsulated housings and insulators.

[0012] For example, in gas-insulated switchgear having an electrical conductor in a bushing that is pulled into or pulled out of an encapsulated housing, the maximum electric field intensity occurs at the surface of the electrical conductor. An insulating layer applied to the electrical conductor creates a layered dielectric, which reduces the location of otherwise maximum electric field intensity on the surface of the conductor, and with an optimally selected insulating layer thickness, the electric field intensity in the critical region becomes approximately uniform. Furthermore, the insulating layer inhibits the probability of free electrons leading to the initiation of an electrical flashover. Localized electric field increases due to surface roughness are reduced or prevented. This increases the reliability and service life of this high-voltage equipment, and allows for reduced maintenance intervals, thereby reducing personnel and costs.

[0013] The at least one electrical conductor may be coated over its entire length with a layer of insulation, which provides the above-mentioned advantages along the entire conductor, not just in the bushing area.

[0014] Alternatively, the at least one electrical conductor can be coated with an insulating layer only in the bushing area, particularly in the area of ​​the opening of the encapsulation housing. This saves material and costs compared to a complete coating, and allows for a precise and advantageous influence on the electric field in the bushing area. By shifting the electric field distribution away from the bushing, flashovers in the bushing area can be reduced or prevented, and the dielectric strength can be increased, particularly in the bushing area or the opening of the encapsulation housing. In this case, this area is particularly critical in terms of electric field strength and susceptibility to flashovers or short circuits.

[0015] The dielectric constant of this insulating layer should be in the range of 1, in particular greater than 1. An insulating layer applied to an electrical conductor with a dielectric constant somewhat greater than that of a gas, i.e., greater than 1, creates a layered dielectric, which reduces the otherwise maximum electric field intensity, especially at the surface of the metallic inner conductor, and, with an optimally selected insulating layer thickness, makes the electric field intensity in the critical region approximately uniform. By optimizing the dielectric constant and thickness of the insulating layer material, it is possible to set the electric field intensity at the metallic inner conductor, i.e., the electrical conductor, and at the surface of the applied insulating layer to be identical.

[0016] The insulating layer can be composed of two or more layers, with the dielectric constant decreasing from layer to layer, and the layer directly adjacent to at least one electrical conductor having the highest dielectric constant. By depositing multiple insulating layers with different dielectric constants, a more pronounced equalization of the electric field can be achieved compared to a single layer, thereby further reducing the insulation load in critical areas. In this case, for example, the inner layer has the highest dielectric constant, and each subsequent layer has a lower or smaller dielectric constant, but always greater than the dielectric constant of the gas.

[0017] The insulating layer can be made of and / or include silicone, Teflon, PTFE and / or PCTFE, which materials are cost-effective, easy to process, can be easily applied, particularly as layers having a dielectric constant greater than 1, are electrically insulating, and are therefore suitable as insulating layers.

[0018] The insulating layer can have a thickness in the range of several millimeters and / or several centimeters. In the case of multiple layers, a thickness in the range of several millimeters provides particularly good electrical insulation, and the total thickness can be in the range of several centimeters. Depending on the material, a thickness of several millimeters or centimeters is sufficient to achieve the desired effect, which provides the above-mentioned advantages.

[0019] The thickness and dielectric constant of this insulating layer can be selected so that the electric field strength at the surface of the electrical conductor, particularly in uncovered areas, and at the outer surface of the insulating layer are of the same magnitude. In this way, flashover through the insulating layer and between the conductor and the insulating layer is minimized or eliminated.

[0020] The encapsulated housing can have a flange, to which an insulator, particularly an insulator made of silicone, ceramic, and / or composite material, particularly shaped like a hollow pipe and / or cylinder and having ribs on its outer periphery, can be fastened in a mechanically stable manner, particularly with its central axis coinciding with the longitudinal axis of at least one electrical conductor. The flange allows for a mechanically stable, long-term, and particularly gas-tight fastening of the insulator to the encapsulated housing. This allows for a gas-tight housing of a high-voltage device with an encapsulated housing and an insulator, which has conductors at least partially electrically shielded within the housing. The insulator and / or the encapsulated housing, conductors, electrodes, and / or devices such as switching units, are thus protected, for example, from the effects of weather.

[0021] The at least one electrode at ground potential can be surrounded, particularly spatially, by a bushing. In this way, further shielding of the electric field in the region of the opening of the encapsulation housing is achieved, particularly good shielding of the opening for the electric conductor or live conductor. The combination of the electrode at ground potential with an insulating layer on the electric conductor results in a high dielectric strength in the bushing area and / or in the region of the opening of the encapsulation housing, thereby achieving the above-mentioned advantages. In addition to the use of only one or more insulating layers, this combination can increase the dielectric strength, particularly in the bushing area. By arranging the at least one electrode at ground potential around the electric conductor, away from the electric conductor provided with at least one insulating layer, a grounded arrangement or fixation of the electrode at ground potential in the encapsulation housing, i.e., around the opening of the flange of the encapsulation housing, is possible, which has a high shielding effect. The at least one electrode at ground potential can be made of or consist of metal, particularly copper, aluminum, and / or steel and / or a metal alloy. Metals provide good electrical shielding and can be easily manufactured or machined into any shape at low cost.

[0022] The central axis of the insulator can be aligned with or coincident with the central axis of at least one electrode at ground potential and / or the longitudinal axis of at least one live conductor or electrical conductor, thereby providing a space-saving and cost-effective electrode arrangement with good shielding effect.

[0023] At least one switching unit of the high-voltage switchgear is included, in particular arranged in an encapsulated housing, and / or can be connected via at least one electrical conductor to an electricity consumer, a generator and / or a power line in the electricity grid.The switching units of the high-voltage switchgear are installed in an encapsulated housing of the above-mentioned type having at least one live conductor or at least one bushing for an electrical conductor, which is associated with the above-mentioned advantages as high-voltage apparatus, in particular for the high-voltage switchgear.

[0024] The at least one electrical conductor may be made of a metal, in particular copper, aluminum, and / or steel, and / or a metal alloy. The at least one electrical conductor may have the shape of a cylindrical bar and / or rod. Metals such as copper, aluminum, and / or steel are good electrical conductors, resulting in low power losses in high-voltage installations, especially at high currents in the range of up to several hundred amperes. This allows for good electrical connection from electrical elements of the high-voltage installation, such as switchgear units, to external consumers, generators, and / or power lines in the power grid with low power losses during operation of the high-voltage installation. The rounded shape of the electrical conductor, in particular formed as a cylindrical bar and / or rod, especially with a diameter in the range of several centimeters, prevents voltage buildup at the edges and provides an electric field distribution around the live electrical conductor that minimizes or prevents electrical flashover in the bushing area.

[0025] This high-voltage device, particularly the encapsulated housing and / or bushing, can be filled with clean air. Clean air is cost-effective, environmentally friendly, and particularly climate-neutral. The lower dielectric strength of clean air compared to conventional insulating gases such as SF6 can be compensated for by providing an insulating layer on the electrical conductor, particularly in the area of ​​the opening in the encapsulated housing through which the live conductor or electrical conductor passes. This allows the same encapsulated housing to be used for different insulating gases, which allows for simple replacement in existing high-voltage devices, particularly in the bushing area, which has a climate-friendly effect. Furthermore, the use of particularly climate-friendly insulating gases allows for cost-effective mass production in new installations. The encapsulated housing and insulators can be used with small dimensions, which, along with the above advantages, saves material and costs.

[0026] The method according to the invention for increasing the dielectric strength in a high-voltage apparatus, in particular the above-mentioned high-voltage apparatus, comprises coating at least one electrical conductor with an insulating layer, in particular in the bushing region for at least one electrical conductor leading into and / or leading out of the encapsulated housing of the high-voltage apparatus.

[0027] The advantages of the method according to the invention as defined in claim 14 for increasing the dielectric strength in high-voltage devices, in particular in the above-mentioned high-voltage devices, are similar to the above-mentioned advantages of the high-voltage device according to the invention as defined in claim 1, and vice versa.

[0028] The present invention will be explained in more detail below with reference to the drawings showing an example of the invention. [Brief explanation of the drawings]

[0029] [Figure 1] Schematic diagram of an electrical conductor 4 coated with an insulating layer 5 [Figure 2]1 is a schematic cross-sectional view of a portion of a high-voltage device 1 according to the present invention, in which an opening is provided in a capsule-shaped housing 2 through which a bushing 3 for a live conductor 4 passes, the conductor 4 being covered with an insulating layer 5. DETAILED DESCRIPTION OF THE INVENTION

[0030] 1 shows an electrical conductor 4 used in a high-voltage device according to the present invention as a live conductor for electrically connecting power consumers, generators and / or power lines in a power grid. The electrical conductor 4 is formed in the shape of a cylindrical rod or cylindrical pipe and has an outer jacket that is partially coated with an insulating layer 5. The electrical conductor 4 is made of and / or includes, for example, copper, aluminum and / or steel. Its diameter is, for example, in the range of 1 to 10 cm, and its length is, for example, in the range of 1 to 10 m.

[0031] The insulating layer 5 is made of and / or comprises, for example, silicone, Teflon, PTFE, and / or PCTFE. The thickness of the layer ranges, for example, from a few millimeters to a few centimeters, in particular 1 cm. In the embodiment of FIG. 1, the electrical conductor 4 is only partially covered with the insulating layer 5, for example, only over half its length. The thickness and length of the covering depend, for example, on the shape and dimensions of the bushing, the maximum current and / or maximum voltage of the high-voltage device, the material selection of the conductor 4 and the material selection of the insulating layer 5, and / or the shape, thickness, and length of the conductor 4. The material selection, thickness, and length of the covering of the conductor 4, which comprises an electrically insulating material, are optimized, in particular, so that the electric field distribution along the conductor 4 is uniform, for example in the bushing region of the high-voltage device according to the present invention.

[0032] FIG. 2 shows a schematic cross section of a portion of a high-voltage device 1 according to the present invention, with an opening in the capsule-type housing 2 of the high-voltage device 1. This opening is provided with a flange 9 formed in an annular or collar-like shape. The flange 9 has a number of holes for fastening means, such as screws. A hollow pipe-shaped insulator 10 is arranged perpendicular to the flange 9 and is mechanically and stably fixed to the flange 9 via fastening means, particularly screws. The capsule-type housing 2 with the flange 9 is made of, for example, metal, particularly aluminum. The insulator 10 is made of, for example, ceramic, silicone, and / or a composite material. The outer periphery of the insulator 10 is formed with a number of ribs, particularly collar-like ribs, to lengthen the creepage current path.

[0033] The hollow pipe-shaped insulator 10 has a circular cross section and a longitudinal axis 6 perpendicular to the plane of the circular opening, which intersects with or passes through the opening of the capsule housing 2 at the center of the circle. A switching unit, for example, of the high-voltage switchgear included in the high-voltage apparatus 1 according to the present invention is arranged inside the capsule housing 2 and is electrically connected via a conductor 4 to power consumers, generators, and / or power lines in the power system outside the capsule housing 2. The electrical conductor 4, which is live during operation of the high-voltage apparatus 1 or when the switching unit is in the closed state, is formed, in particular, in the shape of a rod or bar, as shown in detail in FIG. 1 , and has a longitudinal axis that coincides with or is identical to the longitudinal axis 6 of the insulator.

[0034] When an electric current flows through the electrical conductor 4, an electric field and a magnetic field are generated around the conductor 4. The conductor 4 is at a high voltage potential, particularly up to 1200 kV, and the encapsulation housing 2 is earthed, i.e., at earth potential. A potential difference between the earthed encapsulation housing 2 and the live conductor 4 can cause a voltage flashover and / or a short circuit. To prevent this, the opening of the encapsulation housing 2 has a radius sufficient to ensure a minimum distance between the conductor 4 and the encapsulation housing 4, which radius is large enough to prevent a voltage flashover. This required minimum distance depends on the insulating gas, e.g., clean air, filled in the encapsulation housing 4 and the insulator 10, and further depends on the pressure of the insulating gas, e.g., 1 bar (10 5 Pa). Additional measures can be taken to reduce this minimum distance.

[0035] One possibility for shortening the minimum distance while maintaining sufficient dielectric strength in the region of the opening of the encapsulation housing 4 is to use an electrode 7 at ground potential, as shown in FIG. 2. This electrode 7 is made of metal, in particular aluminum, copper, and / or steel, and has the shape of a hollow cylinder or hollow pipe with a circular cross section. The hollow pipe-like electrode 7 with a circular cross section has a longitudinal or central axis 6 that is perpendicular to the plane of the circular opening and intersects or passes through the opening of the encapsulation housing 2 at the center of the circle. The longitudinal or central axis of the electrode 7, which is applied to ground potential, includes or is identical to the longitudinal axis 6 of the insulator 10. The electrode 7 is mechanically and electrically conductively fixed to the flange 9 of the encapsulation housing 2 using fixing means, such as screws, and protrudes into the insulator 10 or into its internal hollow space. This electrode 7 changes the electric field between the encapsulation housing 2 and the live conductor 4 so that any voltage buildup at the opening or flange 9 of the encapsulation housing 2 is shielded by the electrode 7 or transferred to the inside of the insulator 10.

[0036] According to the present invention, the application of an insulating layer 5 on the electrical conductor 4 provides additional shielding or modification of the electric field between the encapsulation housing 2 and the electrical conductor or live conductor 4. The insulating layer 5 modifies the electric field along the electrical conductor 4 so that it is uniform and transferred to the interior of the insulator 10 and into the encapsulation housing 2. The probability of free electrons initiating a discharge between the electrical conductor 4 and the encapsulation housing 2 is reduced. Localized electric field buildup due to surface roughness on the surface of the electrical conductor 4 is reduced or prevented. Thus, voltage flashover and / or short circuiting between the encapsulation housing 2 and the live conductor 4 is prevented even when the size of the opening in the encapsulation housing 2 or flange 9 is reduced, when the insulating gas pressure is low, when an alternative insulating gas such as clean air is used, and / or when the voltage during operation of the high-voltage device 1 is increased.

[0037] This results in material savings and lower costs in the case of smaller dimensions and wall thicknesses of the encapsulation housing 2 and insulator 10, lighter weight with increased dielectric strength in the region of the bushing 3 of the live conductor 4 passing through the opening in the encapsulation housing 2, and also allows the use of alternative barrier gases such as clean air at lower pressures, e.g., 1 bar. The reliability and service life of the high voltage apparatus 1 are improved and maintenance costs are reduced.

[0038] The above-described embodiments may be combined with one another and / or with prior art. Thus, for example, the high-voltage apparatus 1 may include a high-voltage switchgear, a disconnector, a transformer, a surge arrester, an instrument transformer, and / or a bushing. The high-voltage apparatus 1, in particular the switchgear, is, for example, designed as a gas-insulated switchgear. The basic principle of providing an insulating layer on a conductor in a bushing for passing through an opening at ground potential is also applicable to outdoor switchgear or outdoor high-voltage apparatus. The present invention can be used in tank-type installations, i.e., installations with switching units arranged in a grounded housing. However, it can also be used in insulator-type installations, i.e., installations with switching units at high voltage potential arranged in an insulator. The electrical conductor 4 is, for example, cylindrical. Furthermore, other shapes are possible, such as shapes with an elliptical cross section and / or shapes formed as a truncated cone.

[0039] The capsule-shaped housing 2 of the high-voltage device 1 is, for example, tank-shaped and hermetically closed by an insulator 10. The tank-shaped container may, for example, be spherical or cylindrical, but other shapes are also possible. The connections between the elements of this high-voltage device are made in a mechanically stable manner, for example, via fastening means, in particular screws, and at least one flange. Other or alternative connection techniques, in particular adhesive, welded, and / or brazed connections, are equally applicable. The use of seals, in particular copper seals, for the hermetic connection of several elements is possible. The ends of the electrodes, in particular the end of the electrode 7 at ground potential, are, for example, rounded to avoid electric field buildup. Other shapes of these electrode ends are also possible, for example, linear, curved, rounded with multiple radiuses, etc.

[0040] The insulating layer 5 on the electrical conductor 4 can be formed, for example, as a single layer or as a layer stack consisting of several layers. These layers can have different dielectric constants, in particular a dielectric constant that decreases from layer to layer, for example, the layer directly in contact with at least one electrical conductor 4 having the highest dielectric constant. By depositing several further insulating layers with different dielectric constants, a more pronounced equalization of the electric field can be achieved compared to only one layer, in which case, for example, the inner layer has the highest dielectric constant and each subsequent layer has a lower or decreasing dielectric constant, but always formed to the dielectric constant of a gas, i.e., greater than 1, thereby further reducing the insulation load in the critical region. [Explanation of symbols]

[0041] 1 High voltage equipment 2. Capsule-type housing 3 Bushings 4 Live conductors 5. Insulation layer 6 Longitudinal or central axis 7 Electrode at ground potential 8 Connection Methods 9 flange 10 Insulators

Claims

1. A high-voltage device (1) having an encapsulated housing (2) and at least one bushing (3) for at least one electrical conductor (4) extending into and / or out of said encapsulated housing (2), The at least one electrical conductor (4) is covered with an insulating layer (5), A high-voltage device (1) characterized in that the thickness and dielectric constant of the insulating layer (5) are selected so that the electric field strength on the surface of the electrical conductor (4) is equal to the electric field strength on the outer surface of the insulating layer (5).

2. 2. High-voltage device (1) according to claim 1, characterized in that the at least one electrical conductor (4) is completely coated with an insulating layer (5) over its entire length.

3. 2. High-voltage device (1) according to claim 1, characterized in that the at least one electrical conductor (4) is coated with an insulating layer (5) in the region of the bushing (3).

4. A high-voltage device (1) described in any one of claims 1 to 3, characterized in that the insulating layer (5) consists of two or more layers, the dielectric constant of which decreases with each layer, and the layer directly in contact with the at least one electrical conductor (4) has the highest dielectric constant.

5. 5. High-voltage device (1) according to any one of claims 1 to 4, characterized in that the insulating layer (5) is made of and / or contains silicone, Teflon, PTFE and / or PCTFE.

6. 6. High-voltage device (1) according to any one of claims 1 to 5, characterized in that the insulating layer (5) has a thickness in the range of a few millimeters and / or a few centimeters.

7. The capsule-type housing (2) has a flange (9) and an insulator (10), 7. The high-voltage device (1) according to claim 1, wherein the insulator (10) is formed in the shape of a hollow pipe and / or a cylinder, is made of silicone, ceramic and / or a composite material, has a plurality of ribs on its outer periphery and is fixed to the flange (9) in a mechanically stable manner.

8. 8. High-voltage device (1) according to any one of claims 1 to 7, characterized in that at least one electrode (7) at ground potential is surrounded by the bushing (3).

9. at least one switching unit of high voltage switchgear; The at least one electrical conductor (4) is disposed within the encapsulated housing (2) and / or is connected to a consumer, a generator, and / or a power line in a power grid. High voltage device (1) according to any one of claims 1 to 8.

10. The at least one electrical conductor (4) consisting of a metal and / or a metal alloy; and / or the at least one electrical conductor (4) has the shape of a bar and / or a rod; High voltage device (1) according to any one of claims 1 to 9, characterized in that

11. A high-voltage device (1) as described in any one of claims 1 to 10, characterized in that the high-voltage device (1) is filled with clean air.

12. A method for increasing the dielectric strength in a high voltage device (1) according to any one of claims 1 to 11, comprising: The method is characterized in that the at least one electrical conductor (4) is coated with an insulating layer (5) in the region of a bushing (3) for the at least one electrical conductor (4) that is brought into and / or brought out of the encapsulation housing of the high-voltage device (1).

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