Prefabricated fusion terminal and its manufacturing process

Abstract

The present invention discloses a prefabricated fusion-type terminal and its manufacturing process. In the prefabricated fusion-type terminal, a first stress cone insulator is used for sleeved cable terminals, a semiconducting body is sleeved on the outer wall of the first stress cone insulator, the semiconducting body is set as a stress cone, the second stress cone insulator is connected to the first stress cone insulator as a whole, the semiconducting body is sealed in the combination of the first stress cone insulator and the second stress cone insulator, and the semiconducting body, the first stress cone insulator and the second stress cone insulator are melt-bonded and cross-linked. Before the on-site cable environment is assembled, the terminal head has been prefabricated, which greatly reduces the workload in the cable environment; the semiconducting body will be electrically connected to the semiconducting shielding body of the cable, and the semiconducting body can disperse and homogenize the electric field of the high-voltage cable terminal to ensure the safety and reliability of the high-voltage cable.

Description

Technical Field

[0001] The invention relates to high-voltage electric power parts and components, and in particular to a prefabricated fusion-type terminal and a manufacturing process thereof. Background Art

[0002] High-voltage cable is a type of power cable, which refers to a power cable used to transmit power above 10kV, and is mostly used in power transmission and distribution. In the actual application of high-voltage cables, the electric field at the terminal of the high-voltage cable is concentrated, and the electric field dispersion and homogenization is completed through the cable terminal. Therefore, it is necessary to have an accessory at the high-voltage cable terminal to disperse and homogenize the electric field, so that the concentrated field strength can be restored to the normal electrical operation state.

[0003] High-voltage cables are usually laid in a relatively small space, such as deep pits, tunnels, elevated roads, etc. Most of the structural parts of the accessories used to connect to the high-voltage cable terminals need to be prepared in advance and brought to the site to be directly and quickly welded to the high-voltage cable terminals. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a prefabricated fusion terminal, which can be prefabricated in advance, reduce the workload in the high-voltage cable environment, and can disperse and homogenize the electric field of the high-voltage cable terminal to ensure the safety and reliability of the high-voltage cable.

[0005] According to a first aspect of an embodiment of the present invention, a prefabricated fusion-type terminal comprises a first stress cone insulator, a semiconducting body and a second stress cone insulator, wherein the first stress cone insulator is used to sleeve the cable terminal, the semiconducting body is sleeved on the outer wall of the first stress cone insulator, the semiconducting body is arranged as a stress cone, the second stress cone insulator is connected to the first stress cone insulator as a whole, the semiconducting body is sealed in a combination of the first stress cone insulator and the second stress cone insulator, and the semiconducting body, the first stress cone insulator and the second stress cone insulator are melt-bonded and cross-linked.

[0006] According to a prefabricated fusion-spliced ​​terminal of an embodiment of the present invention, the terminal head has been prefabricated before being taken to the cable environment for assembly, which greatly reduces the working intensity in the cable environment; the semi-conductor will be electrically connected to the semi-conductive shielding body of the cable, and the curve shape distribution of the stress cone conforms to the law of electric field distribution. The semi-conductor can disperse and homogenize the electric field of the high-voltage cable terminal to ensure the safety and reliability of the high-voltage cable.

[0007] According to some embodiments of the present invention, the first stress cone insulator, the cable body insulation and the second stress cone insulator are made of the same material. The first stress cone insulator, the semi-conductor and the second stress cone insulator and other structural components are made in the factory and welded and installed on site; they are well integrated with the cable body without interface air gaps, have high puncture resistance, and have the same temperature resistance as the cable, which is equivalent to the insulation characteristics of the cable body.

[0008] According to some embodiments of the present invention, the semiconducting body and the semiconducting layer of the cable are made of the same material. The semiconducting body of the terminal head is easily integrated with the cable semiconductor and well combined with the cable insulation, thereby improving the anti-breakdown field strength of the cable.

[0009] According to some embodiments of the present invention, the first stress cone insulator is provided with a connection hole, and the connection hole extends along the axial direction of the first stress cone insulator and penetrates the first stress cone insulator.

[0010] According to some embodiments of the present invention, the bell-mouth end of the semiconductor is configured as a first annular flange so that the end of the stress cone of the semiconductor extends radially outward, and the assembly is provided with a second annular flange for covering the first annular flange.

[0011] A manufacturing process of a prefabricated fusion-type terminal according to a second aspect of an embodiment of the present invention comprises the following steps:

[0012] Blank making, making a blank of the first stress cone insulator;

[0013] Making a semiconducting body, making a semiconducting body in the form of a stress cone;

[0014] Processing the blank, processing the outer wall of the blank to obtain a first stress cone insulator, so that the outer wall of the first stress cone insulator has an outer shape corresponding to the stress cone of the semiconducting body, and the semiconducting body can be sleeved on the outer wall of the first stress cone insulator;

[0015] Coating, coating a material on the outer wall of the semiconductor body, wherein the material is connected to the first stress cone insulator as a whole;

[0016] Hot melt pressing, wrapping and pressing the blank obtained in the coating step with a mold, and heating the mold, and forming the second stress cone insulator after cooling. The semiconducting body is sealed in the combination of the first stress cone insulator and the second stress cone insulator, and the first stress cone insulator and the second stress cone insulator are both in contact with the semiconducting body.

[0017] A manufacturing process for a prefabricated fusion-type terminal according to an embodiment of the present invention has at least the following beneficial effects: the terminal head has been prefabricated before being taken to the cable environment for assembly, which greatly reduces the workload in the cable construction environment; the semiconducting body will be electrically connected to the semiconducting shielding body of the cable, and the semiconducting body can disperse and homogenize the electric field of the high-voltage cable terminal to ensure the safety and reliability of the high-voltage cable.

[0018] According to some embodiments of the present invention, a connection hole is drilled on the first stress cone insulator, and the connection hole extends along the axial direction of the first stress cone insulator and penetrates the first stress cone insulator.

[0019] According to some embodiments of the present invention, the semiconductor, the first stress cone insulator outer wall, and the second stress cone insulator outer wall conform to a stress curve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a schematic structural diagram of the first stress cone insulator, the semiconducting body and the second stress cone insulator when they are melt-bonded and cross-linked according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 showing a cross-sectional view of the structure;

[0023] Figure 3 is a schematic structural diagram of the first stress cone insulator, the semiconducting body and the second stress cone insulator when they are not combined and connected;

[0024] Figure 4 for Figure 3 showing a cross-sectional view of the structure;

[0025] Figure 5 A processing and assembly flow chart of the first stress cone insulator, the semiconducting body and the second stress cone insulator;

[0026] Figure 6 This is a schematic diagram of the structure after the prefabricated fusion terminal is fused to the end of the cable.

[0027] Assembly 100, first stress cone insulator 110, connection hole 111, second stress cone insulator 120, second ring flange 130;

[0028] Semiconductor 200 , first annular flange 210 . DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] Reference Figures 1 to 4 , Figure 6 A prefabricated fusion-type terminal according to an embodiment of the first aspect of the present invention includes a first stress cone insulator 110, a semiconducting body 200 and a second stress cone insulator 120. The first stress cone insulator 110 is used for sleeved cable terminals. The semiconducting body 200 is sleeved on the outer wall of the first stress cone insulator 110. The semiconducting body 200 is configured as a stress cone. The second stress cone insulator 120 is connected to the first stress cone insulator 110 as a whole. The semiconducting body 200 is sealed in a combination 100 of the first stress cone insulator 110 and the second stress cone insulator 120. The semiconducting body 200, the first stress cone insulator 110 and the second stress cone insulator 120 are melt-bonded and cross-linked.

[0034] The direction in which the semiconductor body 200 is sleeved toward the outer wall of the first stress cone insulator 110 is as shown in FIG. Figure 3 and Figure 4 V direction.

[0035] The first stress cone insulator 110 and the second stress cone insulator 120 are both attached to the semiconductor 200 , that is, the first stress cone insulator 110 and the second stress cone insulator 120 are closely attached to the wall surface of the semiconductor 200 , as if they grow on it.

[0036] The prefabricated fusion terminal can be of two types, one with a connection hole 111 directly processed, and the other without a connection hole 111, but with the connection hole 111 processed after confirming the specifications of the connected cable. The high-voltage cable terminal is inserted into the connection hole to obtain an assembly; the assembly is wrapped and pressed with a mold, and the mold is heated, and after cooling, the first stress cone insulator 110 fits the outer wall of the cable, as if it grows on it.

[0037] The first stress cone insulator and the semiconducting body are arranged according to the electrical stress structure, and the electrical stress is evenly distributed according to the stress cone and maintained at a certain pressure level, thereby ensuring the working stability of the cable terminal.

[0038] A prefabricated fusion-type terminal according to an embodiment of the present invention has at least the following beneficial effects: the terminal head has been prefabricated before being taken to the cable environment for assembly, which greatly reduces the workload in the cable environment; the semiconducting body 200 will be electrically connected to the semiconducting shielding body of the cable, and the semiconducting body 200 can disperse and homogenize the electric field of the high-voltage cable terminal to ensure the safety and reliability of the high-voltage cable.

[0039] In some embodiments of the present invention, the first stress cone insulator 110, the cable body insulation and the second stress cone insulator 120 are made of the same material. The first stress cone insulator 110, the semi-conductor 200 and the second stress cone insulator 120 and other structural components are made in the factory and welded and installed on site; they are well integrated with the cable body without interface air gaps, have high puncture resistance, and have the same temperature resistance as the cable, which is equivalent to the insulation characteristics of the cable body.

[0040] In some embodiments of the present invention, the semiconducting body 200 and the semiconducting layer of the cable are made of the same material, which is easy to integrate with the semiconductor of the cable and well combined with the insulation of the cable, thereby improving the anti-breakdown field strength of the cable.

[0041] In some embodiments of the present invention, the first stress cone insulator 110 is provided with a connection hole 111 . The connection hole 111 extends along the axial direction of the first stress cone insulator 110 and penetrates the first stress cone insulator 110 .

[0042] In some embodiments of the present invention, the bell-mouth end of the semiconductor 200 is set as a first annular flange 210 so that the end of the stress cone of the semiconductor 200 extends radially outward, and the assembly 100 is provided with a second annular flange 130 for covering the first annular flange 210.

[0043] Reference Figure 5 According to a second aspect of the present invention, a manufacturing process of a prefabricated fusion-connected terminal includes the following steps:

[0044] Blank making, manufacturing a blank of the first stress cone insulator 110;

[0045] Manufacturing a semiconductor 200, manufacturing a semiconductor 200 in the form of a stress cone;

[0046] Processing the blank, processing the outer wall of the blank to obtain the first stress cone insulator 110, so that the outer wall of the first stress cone insulator 110 has the shape of the stress cone corresponding to the semiconducting body 200, and the semiconducting body 200 can be sleeved on the outer wall of the first stress cone insulator 110;

[0047] Coating, coating the outer wall of the semiconductor 200 with material, the material and the first stress cone insulator 110 are connected as one;

[0048] Hot melt pressing, the blank obtained in the coating step is wrapped and pressed with a mold, and the mold is heated. After cooling, the material forms a second stress cone insulator 120, and the semiconductor 200 is sealed in the combination 100 of the first stress cone insulator 110 and the second stress cone insulator 120. The first stress cone insulator 110 and the second stress cone insulator 120 are both bonded to the semiconductor 200.

[0049] A manufacturing process for a prefabricated fusion-type terminal according to an embodiment of the present invention has at least the following beneficial effects: the terminal head has been prefabricated before being taken to the cable environment for assembly, which greatly reduces the workload in the cable environment; the semiconducting body 200 will be electrically connected to the semiconducting shielding body of the cable, and the semiconducting body 200 can disperse and homogenize the electric field of the high-voltage cable terminal to ensure the safety and reliability of the high-voltage cable.

[0050] The outer wall of the blank is usually processed by turning or milling.

[0051] In hot melt pressing, the pressure is 2.5-4.5MPa, the temperature is 190-260°C, and the time is 1.5-6 hours.

[0052] In some embodiments of the present invention, a connection hole 111 is drilled in the first stress cone insulator 110 . The connection hole 111 extends along the axial direction of the first stress cone insulator 110 and penetrates the first stress cone insulator 110 .

[0053] In some embodiments of the present invention, the semiconductor body 200 , the outer wall of the first stress cone insulator 110 , and the outer wall of the second stress cone insulator 120 conform to the stress curve.

[0054] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A process for manufacturing a prefabricated fusion-type terminal, characterized in that: Used to make prefabricated fusion terminals, the prefabricated fusion terminals include: A first stress cone insulator for sleeved cable terminals; A semi-conductor, sleeved on the outer wall of the first stress cone insulator, wherein the semi-conductor is configured as a stress cone; A second stress cone insulator is connected to the first stress cone insulator as a whole, the semiconducting body is sealed in the combination of the first stress cone insulator and the second stress cone insulator, and the semiconducting body, the first stress cone insulator and the second stress cone insulator are melt-bonded and cross-linked; The process includes the following steps: Blank making, making a blank of the first stress cone insulator; Making a semiconducting body, making a semiconducting body in the form of a stress cone; Processing the blank, processing the outer wall of the blank to obtain a first stress cone insulator, so that the semi-conductor can be sleeved on the outer wall of the first stress cone insulator; Coating, coating a material on the outer wall of the semiconductor body, wherein the material is connected to the first stress cone insulator as a whole; Hot melt pressing, wrapping and pressing the blank obtained in the coating step with a mold, and heating the mold, and forming the second stress cone insulator after cooling. The semiconducting body is sealed in the combination of the first stress cone insulator and the second stress cone insulator, and the first stress cone insulator and the second stress cone insulator are both in contact with the semiconducting body.

2. The manufacturing process of the prefabricated fusion terminal according to claim 1, characterized in that: The first stress cone insulator, the body insulation of the cable and the second stress cone insulator are made of the same material.

3. The manufacturing process of the prefabricated fusion terminal according to claim 1 or 2, characterized in that: The semiconducting body and the semiconducting layer of the cable are made of the same material.

4. The manufacturing process of the prefabricated fusion terminal according to claim 1 or 2, characterized in that: The first stress cone insulator is provided with a connection hole, and the connection hole extends along the axial direction of the first stress cone insulator and penetrates the first stress cone insulator.

5. The manufacturing process of the prefabricated fusion terminal according to claim 1 or 2, characterized in that: The bell-mouth end of the semiconducting body is arranged as a first annular flange, so that the end of the stress cone of the semiconducting body extends radially outward, and the assembly is provided with a second annular flange for covering the first annular flange.

6. The manufacturing process of the prefabricated fusion terminal according to claim 1, characterized in that: A connection hole is drilled on the first stress cone insulator. The connection hole extends along the axial direction of the first stress cone insulator and penetrates the first stress cone insulator.

7. The manufacturing process of the prefabricated fusion terminal according to claim 1, characterized in that: The semiconductor, the first stress cone insulator outer wall and the second stress cone insulator outer wall conform to the stress curve.

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