A cable accessory and a method for improving the interfacial breakdown strength of a cable accessory

Abstract

A cable accessory and a method for improving the interfacial breakdown strength of the cable accessory disclosed in the present disclosure include an insulating part. A second surface layer structure formed by arranging a plurality of vertical tubes is provided inside the insulating part. The first end of the vertical tube is connected to the inside of the insulating part, and the second end of the vertical tube extends into the insulating part. A first surface layer structure formed by arranging a plurality of horizontal tubes is provided inside the second surface layer structure. Both ends of the horizontal tube are flush with both ends of the insulating part. By providing the first surface layer structure and the second surface layer structure inside the insulating part, the interfacial breakdown strength of the cable accessory is improved, effectively ensuring the normal operation of the power cable.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a cable accessory and a method for improving the interface breakdown strength of the cable accessory. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Cable accessories are an important link between cables and cables, and cables and other equipment. Their operating conditions directly affect the stability of power supply. According to statistics, the failures of distribution network cable accessories caused by operating environment factors account for a high proportion of the distribution of cable operation failures, among which the interface of cable accessories is the weak insulation position that needs to be paid special attention.

[0004] Practical experience from online operation of power cables shows that breakdown discharge is most likely to occur at the interface between the insulation layer of the cable and the insulation layer of cable accessories.

[0005] Breakdown strength is an important parameter that indicates the insulation performance of power equipment. During the operation of cable accessories, discharge caused by defects in the accessory interface will cause changes in the interface performance of the cable body and the composite insulation, which can easily lead to cable operation accidents.

[0006] How to improve the interface breakdown strength of cable accessories to ensure the normal operation of power cables is a technical problem that needs to be solved urgently. Summary of the invention

[0007] In order to solve the above-mentioned problems, the present disclosure proposes a cable accessory and a method for improving the interface breakdown strength of the cable accessory, by providing a second surface structure formed by a vertical tube arrangement on the inner side of the cable accessory, and providing a first surface structure formed by a horizontal tube arrangement on the inner side of the second surface structure, thereby improving the interface breakdown strength of the cable accessory, preventing the cable accessory from being broken down by the interface discharge voltage, and ensuring the normal operation of the power cable.

[0008] To achieve the above objectives, the present disclosure adopts the following technical solutions:

[0009] In the first aspect, a cable accessory is proposed, including an insulating part, wherein a second surface structure formed by a plurality of arranged vertical tubes is arranged on the inner side of the insulating part, a first end of the vertical tube is connected to the inner side of the insulating part, and a second end of the vertical tube extends into the interior of the insulating part, and a first surface structure formed by a plurality of arranged transverse tubes is arranged inside the second surface structure, and both ends of the transverse tubes are flush with both ends of the insulating part.

[0010] In the second aspect, a method for improving the breakdown strength of the cable accessory interface is proposed, comprising:

[0011] A second surface structure formed by arranging a plurality of vertical tubes is provided inside the insulating part of the cable accessory;

[0012] A first surface structure formed by arranging a plurality of horizontal tubes is provided inside the second surface structure.

[0013] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0014] 1. By providing a second surface structure formed by arranging vertical tubes inside the cable accessory and a first surface structure formed by arranging horizontal tubes inside the second surface structure, the present disclosure improves the interfacial breakdown strength of the cable accessory, prevents the cable accessory from being broken down by the interfacial discharge voltage, and ensures the normal operation of the power cable.

[0015] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specification drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application.

[0017] Figure 1 Schematic diagram of the overall structure of the cable accessory disclosed in Embodiment 1;

[0018] Figure 2 Schematic cross-sectional view of the surface structure disclosed in Embodiment 1.

[0019] Wherein: 1. Insulating part, 2. Interface, 3. Insulating part of the cable, 4. Surface structure, 4-1. First surface structure, 4-2. Second surface structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present disclosure will be further described below in conjunction with the drawings and embodiments.

[0021] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Example 1

[0024] In order to improve the interfacial breakdown strength of the cable accessory, a cable accessory is disclosed in this embodiment, which includes an insulating part. A second surface structure formed by arranging a plurality of vertical tubes is provided inside the insulating part. The first end of the vertical tube is connected to the inside of the insulating part, and the second end of the vertical tube extends into the insulating part. A first surface structure formed by arranging a plurality of horizontal tubes is provided inside the second surface structure, and both ends of the horizontal tube are flush with both ends of the insulating part.

[0025] Furthermore, the insulating part is a circular ring structure, the second surface structure is a second circular ring structure provided inside the insulating part, and the first surface structure is a first circular ring structure provided inside the second surface structure.

[0026] Furthermore, the plurality of vertical tubes are respectively arranged along the axial direction and the circumference of the insulating part to form the second surface structure.

[0027] Furthermore, the plurality of horizontal tubes are respectively arranged along the radial direction and the circumference of the second surface structure to form the first surface structure.

[0028] Furthermore, the horizontal tube is a flexible tube.

[0029] Furthermore, the heights of the plurality of vertical tubes are the same or different.

[0030] Furthermore, the height of the vertical tube is less than the height set value.

[0031] Furthermore, the overall thickness of the first surface structure is between the first thickness and the second thickness.

[0032] Furthermore, the arrangement gap between adjacent horizontal tubes is less than the first gap size, and the arrangement gap between adjacent vertical tubes is less than the second gap size.

[0033] A cable accessory disclosed in this embodiment will be described in detail.

[0034] The existing cable accessory directly contacts the insulating part of the cable through the insulating part to resist the discharge between the cable accessory and the cable. When the interface between the insulating part of the cable accessory and the insulating part of the cable discharges, the discharge channel will develop towards the insulating part of the cable accessory until breakdown, or the discharge channel develops along the interface and causes local breakdown in the insulating part of the cable accessory in a short time.

[0035] In this embodiment, in order to improve the interfacial breakdown strength of the cable accessory, as Figure 1As shown in the figure, a surface structure 4 is provided inside the insulation part 1 of the cable accessory. By contacting the surface structure 4 with the insulation part 3 of the cable, the interfacial breakdown strength of the cable accessory is improved, and when a discharge phenomenon occurs at the interface 2, the cable accessory is prevented from being broken down by the discharge voltage at the interface 2, ensuring the normal operation of the power cable.

[0036] The insulation part 1 of the cable accessory is in a circular ring structure, and the surface structure 4 is covered inside the circular ring-shaped insulation part 1.

[0037] Among them, the surface structure 4 includes a second surface structure 4-2 and a first surface structure 4-1.

[0038] As Figure 2 shown, the second surface structure 4-2 is arranged inside the circular ring-shaped insulation part 1 and is formed by arranging a plurality of vertical tubes.

[0039] The first surface structure 4-1 is arranged inside the second surface structure and is formed by arranging a plurality of horizontal tubes.

[0040] The second surface structure 4-2 formed by arranging a plurality of vertical tubes and the first surface structure 4-1 formed by arranging a plurality of horizontal tubes are both in a circular ring structure.

[0041] In specific implementation, the specific arrangement mode of the vertical tubes in the second surface structure 4-2 is as follows: the first end of the vertical tube is connected to the inner side of the insulation part 1, the second end of the vertical tube extends into the interior of the insulation part 1, and the vertical tubes are arranged along the circumference and the axial direction of the circular ring-shaped insulation part 1 respectively, so that the formed second surface structure 4-2 can cover the inner side of the insulation part 1.

[0042] The heights of the respective vertical tubes can be the same or different, but the heights are all less than the height setting value, and the height setting value here can be 500 nm.

[0043] The diameters of the vertical tubes are all less than the diameter setting value, and the diameter setting value here can be 500 nm.

[0044] When the vertical tubes are arranged, it can be in a closely arranged mode, that is, the gap between adjacent vertical tubes is zero, or it can also adopt the mode of arranging with gaps between adjacent vertical tubes, and the arrangement gap between adjacent vertical tubes is less than the second gap size. The second gap size here can be 500 nm. In the actual production process, considering the process problems, when the vertical tubes are arranged, the gap arrangement mode can be adopted, and the arrangement gap is limited between 200 - 500 nm for the convenience of production.

[0045] The arrangement mode of the horizontal tubes in the first surface structure 4-1 is as follows: one end of the horizontal tube is flush with one end of the insulation part 1, and the other end is flush with the other end of the insulation part 1; a plurality of horizontal tubes are arranged along the radial direction and the circumference of the second surface structure 4-2 respectively to form the first surface structure 4-1.

[0046] The overall thickness of the first surface layer structure 4-1 formed by the arrangement of horizontal tubes is between the first thickness and the second thickness. In a specific implementation, the first thickness is 0.5 mm, the second thickness is 1 mm, and the overall thickness of the first surface layer structure 4-1 is between 0.5 mm and 1 mm.

[0047] The horizontal tubes are arranged in a close arrangement or a spaced arrangement. When in a spaced arrangement, the arrangement gap between the horizontal tubes is less than the first gap size, and the first gap size here is 500 nm.

[0048] The horizontal tubes are made of flexible tubes and are bendable, and the diameter of the horizontal tubes can be 500 nm.

[0049] The surface roughness of the inner surface of the first surface layer structure 4-1 formed by the arrangement of multiple horizontal tubes is the same as that of the inner side surface of the insulating part 1.

[0050] In a specific implementation, both the horizontal tubes and the vertical tubes are hollow tubular structures and are made of insulating materials. In a specific implementation, the materials of the horizontal tubes and the vertical tubes can be selected to be the same as that of the insulating part.

[0051] When a discharge occurs at the interface 2 at the insulating part 3 of the cable accessory disclosed in this embodiment and the cable, the horizontal tubes in the first surface layer structure 4-1 will prevent electrons from developing towards the second surface layer structure 4-2. The electrons migrate along the surface of the horizontal tubes in the first surface layer structure 4-1, which not only increases the migration distance but also can reduce the migration kinetic energy, reduce or even prevent the electrons from continuing to collide, initially improve the interface breakdown strength of the cable accessory, and prevent the cable accessory from being broken down by the discharge voltage. When the electrons enter the second surface layer structure 4-2 from the first surface layer structure 4-1, the electrons will be trapped in the vertical tubes of the second surface layer structure 4-2. The vertical tubes are hollow tubes and the diameter of the hollow tubes is small, which will prevent the further development of the discharge, thereby further improving the interface breakdown strength of the cable accessory.

[0052] The cable accessory disclosed in this embodiment improves the interface breakdown strength of the cable accessory by arranging a second surface layer structure formed by vertical tubes inside the cable accessory and arranging a first surface layer structure formed by horizontal tubes inside the second surface layer structure, preventing the cable accessory from being broken down by the interface discharge voltage, and ensuring the normal operation of the power cable.

[0053] Embodiment 2

[0054] In this embodiment, a method for improving the interface breakdown strength of a cable accessory is disclosed, including:

[0055] Arranging a second surface layer structure formed by multiple vertical tubes inside the insulating part of the cable accessory;

[0056] Inside the second surface structure, a first surface structure formed by arranging a plurality of transverse tubes is provided.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A cable accessory, comprising an insulating part, characterized in that, Inside the insulating part, a second surface structure formed by arranging a plurality of vertical tubes is provided. The first end of the vertical tube is connected to the inner side of the insulating part, and the second end of the vertical tube extends into the insulating part. Inside the second surface structure, a first surface structure formed by arranging a plurality of horizontal tubes is provided, and both ends of the horizontal tube are flush with both ends of the insulating part; The plurality of vertical tubes are respectively arranged along the axial direction and the circumference of the insulating part to form a second surface structure; The plurality of horizontal tubes are respectively arranged along the radial direction and the circumference of the second surface structure to form a first surface structure; The vertical tubes and the horizontal tubes are arranged in a closely arranged manner or a spaced arrangement manner; The horizontal tubes and the vertical tubes are hollow tubular structures and are made of insulating materials; The surface roughness of the inner surface of the first surface structure formed by arranging the plurality of horizontal tubes is the same as the surface roughness of the inner side surface of the insulating part; The height of each vertical tube is less than a height setting value; The arrangement gap between adjacent horizontal tubes is less than a first gap size, and the arrangement gap between adjacent vertical tubes is less than a second gap size.

2. The cable accessory according to claim 1, characterized in that The insulating part is a circular ring structure, the second surface structure is a second circular ring structure arranged on the inner side of the insulating part, and the first surface structure is a first circular ring structure arranged inside the second surface structure.

3. A cable accessory as claimed in claim 1, characterized in that, The horizontal tube is a flexible tube.

4. A cable accessory as claimed in claim 1, wherein, The heights of the plurality of vertical tubes are the same or different.

5. A cable accessory according to claim 1, characterized in that, The overall thickness of the first surface structure is between a first thickness and a second thickness.

6. A method for improving the interfacial breakdown strength of cable accessories, characterized in that, An electrical cable accessory according to any one of claims 1-5, comprising: Inside the insulating part of the electrical cable accessory, a second surface structure formed by arranging a plurality of vertical tubes is provided; Inside the second surface structure, a first surface structure formed by arranging a plurality of horizontal tubes is provided.

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