Rubber umbrella skirt containing capacitive screen, high-voltage electric appliance, voltage transformer and insulator

Abstract

The utility model relates to the field of high-voltage electric appliances, and provides a rubber umbrella skirt containing a capacitive screen and a high-voltage electric appliance, a voltage transformer and an insulator with the rubber umbrella skirt, the rubber umbrella skirt comprises an insulating rubber body with a hollow cavity, the capacitive screen surrounding the hollow cavity is embedded in the insulating rubber body, and the capacitive screen is embedded in the insulating rubber body. When a high-voltage electric appliance is sleeved with the rubber umbrella skirt, the rubber umbrella skirt not only has the function of preventing rainwater from wetting the whole outer insulation surface so as to improve the wet flashover voltage, but also has the shielding function so as to improve the anti-interference capability of the product. Particularly, a plurality of capacitive screens which are sequentially overlapped at intervals are arranged in the rubber umbrella skirt to form a group of capacitors connected in series, so that a shielding effect can be achieved, the anti-interference capability of a product can be improved, the voltage and the electric field intensity of the outer surface of a high-voltage electric appliance can be uniformized, the direct flash distance of the high-voltage electric appliance can be reduced, and the size of the high-voltage electric appliance can be reduced. And the anti-pollution level of the high-voltage electric appliance is improved.

Description

Technical Field

[0001] The utility model relates to the field of high-voltage electrical appliances, in particular to a rubber shed with a built-in capacitance screen and a high-voltage electrical appliance. Background Art

[0002] The insulation of high-voltage electrical appliances consists of two parts, the part exposed to the atmosphere is called external insulation, and the part covered by the external insulation is called internal insulation. The external insulation of high-voltage electrical appliances used outdoors and some indoor high-voltage electrical appliances usually has sheds, which prevent rain from wetting the entire surface of the external insulation to increase the wet flashover voltage, and extend the surface leakage distance to increase the dirty flashover voltage. The external insulation of some other indoor high-voltage electrical appliances may not have sheds.

[0003] For non-capacitive insulated high-voltage electrical appliances, the distribution of the axial electric field strength is very uneven. Even with an outer insulating shed and a large grading ring, the direct flash distance needs to be increased, which increases the length of the high-voltage electrical appliance. For example, the silicone rubber composite insulator disclosed in the Chinese patent application number CN201320109321.6 has a silicone rubber shed outside the insulator core rod. The Chinese patent application number CN02263868.7 discloses an improved composite jacket metal oxide arrester with a silicone rubber shed sheath on the outside.

[0004] For high-voltage electrical appliances such as voltage transformers containing capacitor voltage dividers that require resistance to external interference, in order to have good anti-interference performance, one method is to increase the capacitance of the capacitor voltage divider, and another method is to install a shielding structure outside the capacitor voltage divider, and an outer insulating shed is required on the outermost side, which adds new mechanisms and assembly steps. For example, a low-oil voltage transformer disclosed in Chinese patent application number CN201520365667.1 is provided with a silicone rubber shed on the outside. The electronic voltage transformer disclosed in Chinese patent application number CN200910183438.7 is provided with a high-temperature vulcanized silicone rubber shed body that is one-time integrally injected and molded on the outside. Utility Model Content

[0005] The utility model aims to overcome at least one defect of the prior art and provides a rubber shed containing a capacitive screen, a high-voltage electrical appliance, a voltage transformer and an insulator.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a rubber shed with a capacitive screen inside, comprising an insulating rubber body with a hollow cavity, in which a capacitive screen surrounding the hollow cavity is embedded.

[0008] Preferably, a capacitive screen surrounding the hollow cavity is embedded in the insulating rubber body.

[0009] Preferably, a plurality of capacitor screens surrounding the hollow cavity are embedded in the insulating rubber body, and the plurality of capacitor screens are offsetly arranged in a stacked manner from one end to the other end of the insulating rubber body along the axial direction of the hollow cavity, and the two capacitor screens at the two ends are provided with electrodes for wiring.

[0010] Preferably, it comprises a plurality of independent umbrella skirt units having unit hollow cavities, each umbrella skirt unit is provided with a capacitor screen surrounding its unit hollow cavity, the plurality of umbrella skirt units are stacked in sequence and assembled into an insulating rubber body, and the capacitor screens in the plurality of umbrella skirt units are stacked in sequence to form a group of capacitors connected in series, the unit hollow cavities of the plurality of umbrella skirt units are connected to form a hollow cavity of the insulating rubber body, the capacitor screen of the uppermost umbrella skirt unit is provided with an electrode for wiring, and the capacitor screen of the lowermost umbrella skirt unit is provided with an electrode for wiring.

[0011] Preferably, the tail end of the upper umbrella skirt unit is sleeved on the outside of the head end of the umbrella skirt unit located below it, and the tail end of the capacitive screen of the umbrella skirt unit located above is located outside the head end of the capacitive screen of the umbrella skirt unit below it; or, the head end of the umbrella skirt unit located below is sleeved on the outside of the tail end of the umbrella skirt unit located above it, and the head end of the capacitive screen of the umbrella skirt unit located below is located outside the tail end of the capacitive screen of the umbrella skirt unit above it.

[0012] Preferably, the multiple umbrella skirt units include a first umbrella skirt unit located at the top, a second umbrella skirt unit located at the bottom, and one or more intermediate umbrella skirt units located between the first umbrella skirt unit and the second umbrella skirt unit; the top of the first umbrella skirt unit is provided with an exposed electrode connected to the capacitive screen, the bottom of the second umbrella skirt unit is provided with an exposed electrode connected to the capacitive screen, and the capacitive screen of the intermediate umbrella skirt unit is entirely located in the insulating material of the intermediate umbrella skirt unit.

[0013] Preferably, the insulating rubber body is made of insulating rubber material, and the capacitive screen is made of conductive or semi-conductive material.

[0014] Preferably, the capacitive screen is conductive rubber or semi-conductive rubber.

[0015] Preferably, the rubber umbrella skirt is integrally formed, and the tail end of the previous capacitive screen is spaced around the outside of the head end of the next capacitive screen, or the head end of the next capacitive screen is spaced around the outside of the tail end of the previous capacitive screen.

[0016] The utility model also provides a high-voltage electrical appliance, which has any of the above-mentioned rubber sheds with a built-in capacitor screen as external insulation.

[0017] Preferably, the high-voltage electrical appliance is an insulator, a lightning arrester, a bushing, a voltage transformer, a current transformer or a lightning arrester.

[0018] The utility model also provides a voltage transformer, comprising an inner insulation and a voltage sensor in the inner insulation, wherein the rubber shed containing a capacitance screen as described in any one of the above items is arranged outside the inner insulation as an outer insulation.

[0019] An insulator comprises an inner insulation of an insulating rod or an insulating tube, and a rubber shed containing a capacitive screen as described in any one of the above items is arranged on the outer sleeve of the inner insulation as an outer insulation.

[0020] The rubber shed with built-in capacitance screen of the utility model is provided with capacitance screen. When the rubber shed is put on the high-voltage electrical appliance, it not only prevents rain from wetting the entire outer insulation surface to increase the wet flashover voltage, but also has a shielding effect to improve the anti-interference ability of the product.

[0021] In particular, a plurality of capacitor screens are arranged in the rubber shed, which are stacked in sequence and spaced apart, to form a group of capacitors connected in series. The rubber shed is sheathed outside the high-voltage electrical appliance. One of the two electrodes at both ends of the plurality of capacitor screens in the rubber shed is connected to the high-voltage end of the high-voltage electrical appliance, and the other is connected to the grounding end of the high-voltage electrical appliance. The invention can not only play a shielding role and improve the anti-interference ability of the product, but also make the voltage and electric field strength on the outer surface of the high-voltage electrical appliance uniform, thereby reducing the direct flash distance of the high-voltage electrical appliance, reducing the size of the high-voltage electrical appliance, and improving the pollution resistance level of the high-voltage electrical appliance.

[0022] In particular, the rubber shed is assembled by shed units, each shed unit is provided with a capacitive screen surrounding the hollow cavity of the unit, and the rubber shed is sleeved on the outside of the high-voltage electrical appliance as external insulation, without changing the internal structure of the existing high-voltage electrical appliance, and can be applicable to the voltage balancing, shielding and pollution resistance requirements of various high-voltage electrical appliances, and is the most preferred embodiment of the present application.

[0023] The high-voltage electrical appliance of the utility model is provided with the rubber umbrella skirt of the present application, which not only has the function of preventing rain from wetting the entire outer insulation surface to increase the wet flashover voltage, but also has a shielding effect to improve the anti-interference ability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of the first embodiment of the rubber shed with a capacitive screen in the utility model;

[0025] Figure 2 It is a cross-sectional view of the second embodiment of the rubber shed with a capacitive screen in the utility model;

[0026] Figure 3 It is a cross-sectional view of the third embodiment of the rubber shed with a capacitive screen included in the utility model;

[0027] Figure 4 It is a cross-sectional view of the first shed unit of the utility model;

[0028] Figure 5 It is a cross-sectional view of the middle shed unit of the utility model;

[0029] Figure 6 is a cross-sectional view of the second shed unit of the utility model;

[0030] Reference numerals include:

[0031] In the figure, 10 is rubber umbrella skirt 10, 11 is the first umbrella skirt unit, 12 is the middle umbrella skirt unit, 13 is the third umbrella skirt unit, 14 is the electrode, 15 is the capacitor screen, and 16 is the insulating rubber body. DETAILED DESCRIPTION

[0032] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the utility model. The protection scope of the utility model is not limited to the description of the following embodiments.

[0033] As described in the background technology, the rubber shed 10 is widely used in high-voltage electrical appliances, including an insulating rubber body 16 with a hollow cavity, which is used to be sleeved on the outside of the high-voltage electrical appliance as the external insulation of the high-voltage electrical appliance. The high-voltage electrical appliance can be an insulator, a lightning arrester, a bushing, a voltage transformer, a current transformer or a lightning arrester, etc., and is provided with an internal insulation capable of resisting high voltage, and the internal insulation is usually a solid rigid material. The rubber shed 10 is elastic and can be tightly sleeved outside the internal insulation. The insulating rubber body 16 is made of insulating rubber material, and can be made of rubber or rubber composite materials such as silicone rubber and / or isoprene rubber and / or butadiene rubber. This is the prior art in the art and will not be repeated here.

[0034] An improvement of the present application is that the rubber shed 10 includes an insulating rubber body 16 having a hollow cavity, and a capacitive screen 15 surrounding the hollow cavity is embedded in the insulating rubber body 16. The capacitive screen 15 is embedded in the insulating rubber body 16, not on its inner surface or outer surface. When the rubber shed 10 is put on a high-voltage electrical appliance, it not only prevents rain from wetting the entire outer insulating surface to increase the wet flashover voltage, but also has a shielding effect to improve the anti-interference ability of the product.

[0035] The capacitive screen 15 is made of conductive or semi-conductive material, such as copper foil, aluminum foil, conductive rubber, semi-conductive rubber, or other composite conductive and semi-conductive materials, and the insulating rubber body 16 is made of insulating rubber material. The specific materials are all existing technologies in the field and are irrelevant to the improvement points of the present application, so they will not be repeated here.

[0036] Preferably, the capacitive screen 15 is an elastic capacitive screen made of a conductive or semi-conductive elastic material, such as conductive rubber or semi-conductive rubber. The specific materials are all prior art in the art and are irrelevant to the improvement of the present application, and will not be described in detail. A cylinder made of a conductive or semi-conductive elastic material is embedded in the insulating rubber body 16 to form the capacitive screen 15.

[0037] The insulating rubber body 16 of the rubber shed 10 includes a plurality of shed units, wherein the plurality of shed units are integrally formed to form an integral insulating rubber body 16 (they may be integrally formed once or multiple times), or the plurality of shed units are assembled to form the insulating rubber body 16, wherein the unit hollow cavities of the plurality of shed units are connected to form a hollow cavity of the insulating rubber body 16, and a capacitive screen 15 surrounding the hollow cavity is embedded in the insulating rubber body 16.

[0038] The following are three examples of rubber sheds 10:

[0039] Embodiment 1

[0040] like Figure 1 As shown, a rubber shed with a capacitive screen inside includes an insulating rubber body 16 with a hollow cavity, a capacitive screen 15 surrounding the hollow cavity is embedded in the insulating rubber body 16, and an electrode 14 is provided at one end of the capacitive screen 15 for connecting to the ground terminal of the high-voltage electrical appliance. When the rubber shed 10 is put on the high-voltage electrical appliance as the external insulation of the high-voltage electrical appliance, it not only has the function of preventing rain from wetting the entire external insulation surface to increase the wet flashover voltage, but also has a shielding effect to improve the anti-interference ability of the product. However, the capacitive screen 15 of this embodiment does not have a voltage balancing effect. The capacitive screen 15 is cylindrical, surrounding the hollow cavity of the insulating rubber body 16, and basically extends from one end of the insulating rubber body 16 to the other end along the axial direction of the hollow cavity.

[0041] Embodiment 2

[0042] like Figure 2As shown, a rubber shed with a capacitive screen is provided. The rubber shed 10 of this embodiment is integrally formed and includes an insulating rubber body 16 having a hollow cavity. The insulating rubber body 16 is integrally formed and includes a plurality of shed units. The plurality of shed units are integrally formed to form an integral insulating rubber body 16. A plurality of capacitive screens 15 surrounding the hollow cavity are embedded in the insulating rubber body 16. The plurality of capacitive screens 15 are sequentially spaced and stacked along the axial direction of the hollow cavity from one end to the other end of the insulating rubber body 16. That is, along the axial direction of the hollow cavity, the upper capacitive screen 15 is disposed on the insulating rubber body 16. The tail end of 15 is spaced around the outside of the head end of the next capacitor screen 15, or the head end of the next capacitor screen 15 is spaced around the outside of the tail end of the previous capacitor screen 15, the capacitor screen 15 is embedded in the insulating rubber body 16, and the insulating rubber material of the insulating rubber body 16 is between the overlapping parts of the two capacitor screens 15. The two capacitor screens 15 at both ends are provided with electrodes 14 for wiring, wherein the electrode 14 of one capacitor screen 15 is used to connect the high voltage end of the high voltage electrical appliance, and the electrode 14 of the other capacitor screen 15 is used to connect the ground end of the high voltage electrical appliance.

[0043] Preferably, there are three or more rubber umbrella skirts 10, so that the multiple capacitor screens 15 in the rubber umbrella skirt 10 form a group of capacitors connected in series, the rubber umbrella skirt 10 is sleeved outside the high-voltage electrical appliance, and the two electrodes 14 at both ends of the multiple capacitor screens in the rubber umbrella skirt 10, one is connected to the high-voltage end of the high-voltage electrical appliance, and the other is connected to the ground end of the high-voltage electrical appliance; it can not only play a shielding role and improve the anti-interference ability of the product, but also can even out the voltage and electric field strength on the outer surface of the high-voltage electrical appliance, thus reducing the direct flash distance of the high-voltage electrical appliance, can reduce the size of the high-voltage electrical appliance, and improve the pollution resistance level of the high-voltage electrical appliance.

[0044] Embodiment 3

[0045] like Figure 3-6 As shown, a preferred embodiment of the present application is a rubber shed containing a capacitive screen, comprising a plurality of independent shed units having unit hollow cavities, each shed unit being provided with a capacitive screen 15 surrounding the unit hollow cavity, a plurality of shed units being stacked in sequence and assembled into an insulating rubber body 16, and the capacitive screens 15 in the plurality of shed units being stacked in sequence to form a group of capacitors connected in series, the unit hollow cavities of the plurality of shed units being connected to form the hollow cavity of the insulating rubber body 16, the capacitive screen 15 of the topmost shed unit being provided with an electrode 14 for connecting to the high voltage end of a high voltage electrical appliance, and the capacitive screen 15 of the bottommost shed unit being provided with an electrode 14 for connecting to the ground end of the high voltage electrical appliance.

[0046] like Figure 3-6As shown, the rubber shed 10 of the present embodiment is provided with a plurality of independent shed units, and the plurality of shed units are stacked one after another from top to bottom, the tail end of the shed unit located at the top is sleeved on the outside of the head end of the shed unit located therebelow, and the tail end of the capacitor screen 15 of the shed unit located at the top is located on the outside of the head end of the capacitor screen 15 of the shed unit located therebelow, and the capacitor screens 15 of the plurality of shed units form a group of capacitors connected in series.

[0047] The multiple shed units include a first shed unit 11 at the top, a second shed unit at the bottom, and one or more intermediate shed units 12 between the first shed unit 11 and the second shed unit. The top of the first shed unit 11 is provided with an electrode 14 for wiring connected to a capacitor screen 15, and the electrode 14 is exposed to connect to the high-voltage end of a high-voltage electrical appliance. The bottom of the second shed unit is provided with an electrode 14 for wiring connected to a capacitor screen 15, and the electrode 14 is exposed to connect to the ground end of the high-voltage electrical appliance. The capacitor screen 15 of the intermediate shed unit 12 is not provided with an external electrode 14, and the capacitor screen 15 is entirely located in the insulating material of the intermediate shed unit 12. The bottom of the unit hollow cavity of the first shed unit 11 and the intermediate shed unit 12 is provided with an assembly groove, and the assembly groove matches the top shape of the shed unit.

[0048] The rubber shed 10 of this embodiment has multiple independent shed units sleeved outside the high-voltage electrical appliance, forming the rubber shed 10 as the external insulation of the high-voltage electrical appliance, the electrode 14 of the first shed unit 11 is connected to the high-voltage end of the high-voltage electrical appliance, and the electrode 14 of the second shed unit is connected to the ground end of the high-voltage electrical appliance; it can not only play a shielding role and improve the anti-interference ability of the product, but also can even out the voltage and electric field strength on the outer surface of the high-voltage electrical appliance, thus reducing the direct flash distance of the high-voltage electrical appliance, reducing the size of the high-voltage electrical appliance, and improving the pollution resistance level of the high-voltage electrical appliance; at the same time, multiple independent shed units are easier to manufacture and replace, and shed units of different sizes and shapes can be manufactured as needed. The elastic rubber shed 10 is sleeved outside the high-voltage electrical appliance, tightly wrapping the high-voltage electrical appliance, without changing the internal structure of the existing high-voltage electrical appliance, and can be applicable to the voltage balancing, shielding and pollution resistance requirements of various high-voltage electrical appliances, which is the most preferred embodiment of the present application.

[0049] It should be noted that, as other embodiments, the plurality of umbrella skirt units are stacked from top to bottom in sequence, and the head end of the umbrella skirt unit located below can be sleeved on the outside of the tail end of the umbrella skirt unit located above it, and the head end of the capacitor screen 15 of the umbrella skirt unit located below is located on the outside of the tail end of the capacitor screen 15 of the umbrella skirt unit above it, for example, the umbrella-shaped protrusion on the outside of the umbrella skirt unit can be adjusted from the outside of the bottom in the figure to the top or the outside of the middle of the umbrella skirt unit. One, two or more intermediate umbrella skirt units 12 can be set; in special cases, the intermediate umbrella skirt unit 12 can also be not set, only the first umbrella skirt unit 11 and the second umbrella skirt unit. In addition, two or more capacitor screens 15 stacked in sequence can also be set in one umbrella skirt unit. Of course, the best solution is to set one capacitor screen 15 in one umbrella skirt unit. The two electrodes 14 in the rubber umbrella skirt 10 are connected to the high voltage end and the low voltage end, respectively. Usually, the top electrode 14 is connected to the high voltage. In special cases, the bottom electrode 14 can also be connected to the high voltage and the top electrode 14 can be connected to the low voltage.

[0050] It should be noted that the shapes of the rubber shed 10 and the shed unit of the present application are not limited to the shapes of the first, second and third embodiments, and can be various shapes of the rubber shed 10 of the prior art. The umbrella-shaped protrusions on the outer side of the rubber shed 10 are not limited to the shape of umbrellas, and can also be protruding edges or any other shapes. In addition, the sizes of the shed units of the rubber shed 10 can be the same or different; the sizes of the umbrella-shaped protrusions can be the same or different. In addition, the shed can also be provided with other anti-corrosion coatings and other structures, which also belong to the protection scope of the present utility model.

[0051] The rubber shed 10 of the present application can be used for external insulation of various high-voltage electrical appliances, such as insulators, lightning arresters, bushings, voltage transformers, current transformers or lightning arresters.

[0052] For example, an embodiment of a voltage transformer is provided with the rubber shed 10 of the second or third embodiment of the present application as the outer insulation. The voltage transformer includes an inner insulation and a voltage sensor in the inner insulation. The rubber shed 10 of the present application is provided on the outer sleeve of the inner insulation as the outer insulation. The two electrodes 14 of the rubber shed 10 are electrically connected to the high voltage end and the ground end of the voltage sensor respectively. The voltage sensor can adopt an existing mature voltage sensor, such as a capacitive voltage divider, a resistive voltage divider, a resistive-capacitive voltage divider, an inductive voltage divider, etc. For example, a first capacitor C1 and a second capacitor C2 are provided in the inner insulation. The first capacitor C1 and the second capacitor C2 are ceramic capacitors. The first capacitor C1 and the second capacitor C2 are connected in series to form a capacitive voltage divider, and the capacitive voltage divider is used as a voltage sensor. The capacitor formed by the capacitive screen 15 contained in the rubber shed 10 can not only shield the voltage sensor and improve the anti-interference ability of the product, but also can even out the voltage and electric field strength on the outer surface of the voltage transformer, thereby improving the pollution resistance level of the voltage transformer.

[0053] The present application also provides an embodiment of an insulator, wherein the insulator comprises an inner insulation of an insulating rod or an insulating tube, and a rubber shed 10 of Embodiment 1, 2 or 3 of the present application is disposed on the outer sleeve of the inner insulation as an outer insulation. The insulating rod or insulating tube is a prior art in the art. The capacitor screen 15 contained in the rubber shed 10 can evenly distribute the voltage and electric field strength on the insulator, especially on the outer surface of the insulator, thereby improving the pollution resistance level of the insulator and appropriately reducing the length of the insulator.

[0054] The present application also provides an embodiment of a lightning arrester, and the lightning arrester is provided with the rubber shed 10 of the first, second or third embodiment of the present application as external insulation.

[0055] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0056] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A rubber shed with a capacitive screen, comprising an insulating rubber body (16) with a hollow cavity, characterized in that: A capacitive screen (15) surrounding the hollow cavity is embedded in the insulating rubber body (16).

2. The rubber shed with built-in capacitive screen according to claim 1, characterized in that: A capacitive screen (15) surrounding the hollow cavity is embedded in the insulating rubber body (16).

3. The rubber shed with built-in capacitive screen according to claim 1, characterized in that: A plurality of capacitor screens (15) surrounding the hollow cavity are embedded in the insulating rubber body (16). The plurality of capacitor screens (15) are arranged in an offset manner and stacked in sequence from one end to the other end of the insulating rubber body (16) along the axial direction of the hollow cavity. The two capacitor screens (15) at the two ends are provided with electrodes (14) for wiring.

4. The rubber shed with built-in capacitive screen according to claim 1, characterized in that: The invention comprises a plurality of independent shed units having unit hollow cavities, each shed unit is provided with a capacitor screen (15) surrounding the unit hollow cavity, the plurality of shed units are stacked in sequence to form an insulating rubber body (16), and the capacitor screens (15) in the plurality of shed units are stacked in sequence to form a group of capacitors connected in series, the unit hollow cavities of the plurality of shed units are connected to form the hollow cavity of the insulating rubber body (16), the capacitor screen (15) of the uppermost shed unit is provided with an electrode (14) for wiring, and the capacitor screen (15) of the lowermost shed unit is provided with an electrode (14) for wiring.

5. The rubber shed with built-in capacitive screen according to claim 4, characterized in that: The tail end of the upper shed unit is sleeved on the outside of the head end of the lower shed unit, and the tail end of the capacitive screen (15) of the upper shed unit is located outside the head end of the capacitive screen (15) of the lower shed unit; or the head end of the lower shed unit is sleeved on the outside of the tail end of the upper shed unit, and the head end of the capacitive screen (15) of the lower shed unit is located outside the tail end of the capacitive screen (15) of the upper shed unit.

6. The rubber shed with built-in capacitive screen according to claim 4, characterized in that: The plurality of shed units comprise a first shed unit (11) located at the top, a second shed unit located at the bottom, and one or more intermediate shed units (12) located between the first shed unit (11) and the second shed unit; the top of the first shed unit (11) is provided with an exposed electrode (14) connected to a capacitive screen (15), the bottom of the second shed unit is provided with an exposed electrode (14) connected to a capacitive screen (15), and the capacitive screen (15) of the intermediate shed unit (12) is entirely located in the insulating material of the intermediate shed unit (12).

7. The rubber shed with built-in capacitive screen according to claim 3, characterized in that: The rubber umbrella skirt (10) is integrally formed, and the tail end of the previous capacitive screen (15) surrounds the outside of the head end of the next capacitive screen (15) at intervals, or the head end of the next capacitive screen (15) surrounds the outside of the tail end of the previous capacitive screen (15) at intervals.

8. A high voltage electrical appliance, characterized in that: The rubber shed with a built-in capacitive screen as described in any one of claims 1 to 7 is used as external insulation.

9. A voltage transformer, characterized in that: The invention comprises an inner insulation and a voltage sensor in the inner insulation, wherein the rubber shed containing a capacitive screen as claimed in any one of claims 1 to 7 is arranged outside the inner insulation as an outer insulation.

10. An insulator, characterized in that: The insulator comprises an inner insulation of an insulating rod or an insulating tube, and a rubber shed containing a capacitive screen as claimed in any one of claims 1 to 7 is disposed outside the inner insulation as an outer insulation.

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