A three-core submarine cable full-preformed high-voltage power cable terminal

Abstract

The present application relates to the technical field of electric power, especially to a three-core submarine cable full-preformed high-voltage power cable terminal, comprising a fixed support, a cable terminal body installed on the fixed support, the cable terminal body comprising a silicone rubber insulation main body wrapped with a PE heat-shrink umbrella skirt, a connecting shield cover fixed on the upper end of the silicone rubber insulation main body, and a cable body fixed inside the silicone rubber insulation main body. The three-core submarine cable full-preformed high-voltage power cable terminal of the present application adopts a non-fixed structure design to assemble the fixed support and the cable terminal body, and the height of the cable terminal body can be adjusted by using the electrically-controlled bottom adjusting support fixed on the lower surface of the fixed support, so that the structure can be adjusted as needed and the application range is relatively wide; the bending angle of the cable body can be monitored in real time by using the bottom-located external monitoring seat on the lower surface of the bottom guide tail pipe, and the angle of the cable body can be elastically corrected during idle time, greatly improving the monitoring efficiency.

Description

Technical Field

[0001] This invention relates to the field of power technology, and in particular to a three-core submarine cable fully prefabricated high-voltage power cable terminal. Background Technology

[0002] With the increasing size of offshore wind turbines and their expansion into deeper and more distant waters, higher demands are being placed on the technology of their supporting cable accessories. Currently, cable terminals have stringent environmental requirements, exhibiting significant variations in temperature and humidity. Furthermore, offshore wind turbines may experience severe weather conditions such as heavy sandstorms, salt spray, heavy rain, and intense sunlight. During normal turbine operation, cable accessories are also subject to various impacts and vibrations. Therefore, stringent requirements must be imposed on cables and their accessories to address the specific operational and climatic conditions of offshore wind turbines.

[0003] Common outdoor terminals include oil-filled terminals or prefabricated terminals. They are installed by fixing them to a bracket. This installation method cannot adjust the longitudinal tension of the submarine cable, which may cause the cable to sag due to gravity. Furthermore, it is impossible to monitor the extent of the cable sag during adjustment, and it cannot automatically control the cable when it bends. As a result, the monitoring effect on the cable's condition is limited, and the safety is very limited. Summary of the Invention

[0004] The technical problem this invention aims to solve is that current installation methods for power cable terminals cannot adjust the longitudinal tension of submarine cables, which may cause the cables to sag due to gravity. Furthermore, the sag of the cables cannot be monitored during adjustment, and automatic control is not possible when the cables bend. This results in limited monitoring of the cable's condition and compromises its safety.

[0005] The technical solution adopted by this invention to solve its technical problem is: a three-core submarine cable fully prefabricated high-voltage power cable terminal, including a fixed bracket and a cable terminal body installed on the fixed bracket. The cable terminal body includes a silicone rubber insulating body wrapped with a PE heat-shrinkable shed, a connecting shield fixed to the upper end of the silicone rubber insulating body, and a cable body fixed inside the silicone rubber insulating body. An electrically controlled bottom adjusting support rod for controlling the cable terminal body is bolted to the lower surface of the fixed bracket. A bottom guide tail tube is fixedly assembled on the lower surface of the fixed bracket around the cable body. A bottom-mounted external monitoring seat for monitoring the cable body is bolted to the lower surface of the bottom guide tail tube.

[0006] The fixed bracket has a central telescopic through hole for assembling the bottom guide tail tube. The fixed bracket also has a lateral telescopic adjustment through hole outside the central telescopic through hole, which cooperates with the electrically controlled bottom adjustment support rod. The telescopic section of the electrically controlled bottom adjustment support rod is fixedly connected to the lower end of the cable terminal body by passing through the lateral telescopic adjustment through hole.

[0007] Both the central telescopic through-hole and the lateral telescopic adjustment through-hole have a top-down recessed hole with an opening at the top, and a shock-absorbing spring is installed inside the top-down recessed hole.

[0008] The bottom of the bottom-mounted external monitoring base has a conical bottom monitoring groove.

[0009] An annular expansion groove is provided on the inner side of the conical bottom monitoring groove. A lateral detection ring, an arc-shaped elastic reset piece installed on the arc-shaped surface inside the annular expansion groove, and a plurality of pressure monitoring modules are fixed on the inner side of the annular expansion groove.

[0010] An embedded distance monitoring module is fixedly mounted on the upper surface of the fixed bracket.

[0011] An external closed cover is elastically sleeved on the outer side of the cable terminal body.

[0012] The upper surface of the cable terminal body is provided with a plurality of strip-shaped control flip grooves. The outer closed cover includes an annular closed shell sleeved around the cable terminal body and a strip-shaped extrusion spring installed inside the strip-shaped control flip groove. One end of the strip-shaped extrusion spring is fixedly connected to the highest position of the strip-shaped control flip groove, and the other end of the strip-shaped extrusion spring is fixedly connected to the inner arc-shaped surface of the annular closed shell.

[0013] An elastic telescopic cylinder for lifting the electrically controlled bottom adjusting support rod is fixed to the outer side of the bottom guide tail tube by a lateral bracket.

[0014] The outer surface of the PE heat-shrinkable umbrella skirt is fixed with lateral reinforcing ribs at the positions corresponding to the electrically controlled bottom adjustable support rods to improve bending resistance.

[0015] The beneficial effects of this invention are:

[0016] (1) The three-core submarine cable fully prefabricated high-voltage power cable terminal of the present invention adopts a non-fixed structure design to assemble the fixed bracket and the cable terminal body. The height of the cable terminal body can be adjusted by using an electrically controlled bottom adjustment support rod fixed on the lower surface of the fixed bracket, so that its structure can be adjusted as needed, and its application range is relatively wide.

[0017] (2) The bending angle of the cable body can be monitored in real time by using the bottom-mounted external monitoring seat located on the lower surface of the bottom guide tail tube. The angle of the cable body can be flexibly corrected during idle time, which greatly improves the monitoring efficiency.

[0018] (3) The pressure monitoring module inside the bottom-mounted external monitoring base can control the electrically controlled bottom adjustment support rod. By adjusting the relative position of the fixed bracket and the cable terminal body, the longitudinal tension of the cable can be increased, thereby preventing the submarine cable from falling due to gravity and improving the stability and safety of the submarine cable.

[0019] (4) By fixing an embedded distance monitoring module on the upper surface of the fixed bracket, the distance can be monitored and adjusted in real time after the lifting, which is convenient for people to maintain and repair in time.

[0020] (5) An external closed cover is elastically sleeved on the outer side of the cable terminal body, which can ensure its stability when the cable terminal body is adjusted. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the internal structure of the external closed cover in this invention.

[0024] Figure 3 This is a schematic diagram of the position of the lateral detection ring in this invention. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Figure 1 , Figure 2 and Figure 3The diagram shows a three-core submarine cable prefabricated high-voltage power cable terminal, including a fixed bracket 1 and a cable terminal body 2 mounted on the fixed bracket 1. The cable terminal body 2 includes a silicone rubber insulating body 22 wrapped with a PE heat-shrinkable shed 21, a connecting shield 23 fixed to the upper end of the silicone rubber insulating body 22, and a cable body 24 fixed inside the silicone rubber insulating body 22. The lower surface of the fixed bracket 1 is bolted with an electrically controlled bottom adjusting support rod 3 for controlling the cable terminal body 2. The lower surface of the fixed bracket 1 is fixedly assembled with a bottom guide tail tube 4 around the cable body 24. The lower surface of the bottom guide tail tube 4 is bolted with a bottom-mounted external monitoring seat 5 for monitoring the cable body 24.

[0028] The silicone rubber insulation body 22 is formed in a layered structure, consisting of two silicone rubber materials with different hardness. The outer hard silicone layer uses high-hardness silicone rubber to meet the requirements of use in harsh environments such as high-speed airflow and collision and friction of solid particles in the air. It also has good corrosion resistance and can resist highly corrosive rain and snow weather such as acid rain. The elastic silicone layer uses low-hardness silicone rubber to ensure sufficient elastic pressure to adhere tightly to the cable body 24.

[0029] The traditional silicone rubber umbrella skirt is replaced with a PE heat shrink umbrella skirt 21, which has strong weather resistance, puncture resistance, and can be stored and used for a long time. After installation, it has good elasticity and tightly joins the interface with the cable body 24 without gaps. It has good partial discharge and can breathe with the cable body 24 without gaps during long-term use, ensuring long-term safe operation.

[0030] To facilitate internal assembly and telescopic adjustment, a central telescopic through hole for assembling the bottom guide tail tube 4 is provided inside the fixed bracket 1. A lateral telescopic adjustment through hole for cooperating with the electrically controlled bottom adjustment support rod 3 is provided outside the central telescopic through hole inside the fixed bracket 1. The telescopic section of the electrically controlled bottom adjustment support rod 3 is fixedly connected to the lower end of the cable terminal body 2 by passing through the lateral telescopic adjustment through hole.

[0031] The electrically controlled bottom adjustment support rod 3 is existing technology, which controls the relative position between the fixed bracket 1 and the cable terminal body 2 by telescopic control.

[0032] To complement the elastic damping and improve assembly stability, both the central telescopic through-hole and the lateral telescopic adjustment through-hole are provided with top-down recessed holes with openings at the top, and damping springs 6 are installed inside the top-down recessed holes.

[0033] To facilitate bottom detection and easy loading and unloading, the bottom-mounted external monitoring seat 5 has a conical bottom monitoring groove 7 at its lower end.

[0034] In order to monitor the bending angle and direction, an annular expansion groove 8 is provided on the inner side of the conical bottom monitoring groove 7. A lateral detection ring 9, an arc-shaped elastic reset piece 10 installed on the arc-shaped surface inside the annular expansion groove 8, and a plurality of pressure monitoring modules 11 fixed on the inner side of the annular expansion groove 8 are slidably inserted inside the annular expansion groove 8.

[0035] The pressure monitoring module 11 is existing technology. When the cable body 24 bends to one side, it will squeeze the lateral detection ring 9. The lateral detection ring 9 will squeeze the pressure monitoring module 11 at the corresponding position. The position and size of the bending angle can be monitored by the starting position and pressure of the pressure monitoring module 11. Then, the electric bottom adjustment support rod 3 can be activated to correct and straighten the cable.

[0036] In order to monitor the adjustment spacing of the cable terminal body 2, an embedded distance monitoring module 12 is fixedly mounted on the upper surface of the fixed bracket 1.

[0037] The embedded distance monitoring module 12 is existing technology. It monitors the adjustment height of the cable terminal body 2 through optical technology. When the distance exceeds the set warning distance, it will automatically alarm to remind people to maintain it in time.

[0038] To improve the external sealing and lateral bending resistance after the cable terminal body 2 is raised, an external closed cover 13 is elastically sleeved on the outer side of the cable terminal body 2.

[0039] To facilitate flexible assembly and compression closure, the upper surface of the cable terminal body 2 is provided with three strip-shaped control flip grooves 14. The outer closed cover 13 includes an annular closed housing 131 sleeved around the cable terminal body 2 and a strip-shaped compression spring 132 installed inside the strip-shaped control flip grooves 14. One end of the strip-shaped compression spring 132 is fixedly connected to the highest position of the strip-shaped control flip groove 14, and the other end of the strip-shaped compression spring 132 is fixedly connected to the inner arc-shaped surface of the annular closed housing 131.

[0040] After the cable terminal body 2 is raised by the electrically controlled bottom adjusting support rod 3, a gap will be generated between the cable terminal body 2 and the fixed bracket 1. The outer closed cover 13 is pressed downward by the strip extrusion spring 132, thereby closing the gap between the cable terminal body 2 and the fixed bracket 1.

[0041] To improve the stability of the electrically controlled bottom adjustment strut 3, an elastic telescopic cylinder 15 for lifting the electrically controlled bottom adjustment strut 3 is fixed on the outer side of the bottom guide tail tube 4 by a lateral bracket.

[0042] The elastic telescopic cylinder 15 includes a side guide cylinder fixed to the outside of the lateral support, an upper closing cylinder slidably sleeved on the outside of the side guide cylinder, and an internal spring installed between the side guide cylinder and the upper closing cylinder. The side guide cylinder is used to improve the lateral bending resistance of the electrically controlled bottom adjusting support rod 3, while the upper closing cylinder is used to close the upper bolt fixing end of the electrically controlled bottom adjusting support rod 3, improving the sealing performance.

[0043] To improve durability and compressive strength, lateral reinforcing ribs 16 are fixed on the outer side of the PE heat-shrinkable umbrella skirt 21 at the positions corresponding to the electrically controlled bottom adjustable support rods 3 to improve bending resistance.

[0044] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A three-core submarine cable prefabricated high-voltage power cable terminal, comprising a fixed bracket (1) and a cable terminal body (2) mounted on the fixed bracket, characterized in that: The cable terminal body (2) includes a silicone rubber insulating body (22) wrapped with a PE heat shrinkable skirt (21), a connecting shield (23) fixed to the upper end of the silicone rubber insulating body (22), and a cable body (24) fixed inside the silicone rubber insulating body (22). The lower surface of the fixed bracket (1) is bolted with an electrically controlled bottom adjusting support rod (3) for controlling the cable terminal body (2). The lower surface of the fixed bracket (1) is fixedly equipped with a bottom guide tail tube (4) around the cable body (24). The lower surface of the bottom guide tail tube (4) is bolted with a bottom-mounted external monitoring seat (5) for monitoring the cable body (24). The bottom of the bottom-mounted external monitoring base (5) is provided with a conical bottom monitoring groove (7); An annular expansion groove (8) is provided on the inner side of the conical bottom monitoring groove (7). A lateral detection ring (9), an arc-shaped elastic reset piece (10) installed on the arc-shaped surface of the inner side of the annular expansion groove (8), and a plurality of pressure monitoring modules (11) fixed on the inner side of the annular expansion groove (8) are slidably inserted inside the annular expansion groove (8). An external closed cover (13) is elastically sleeved on the outer side of the cable terminal body (2). The electrically controlled bottom adjusting support rod (3) controls the relative position between the fixed bracket (1) and the cable terminal body (2) by telescopic control; The position and magnitude of the bending angle can be monitored by the starting position and pressure magnitude of the pressure monitoring module (11). Then, the bending angle and bending magnitude can be corrected and straightened by starting the electrically controlled bottom adjustment strut (3).

2. The three-core submarine cable fully prefabricated high-voltage power cable terminal according to claim 1, characterized in that: The fixed bracket (1) has a central telescopic through hole for assembling the bottom guide tail tube (4) at its center. The fixed bracket (1) has a lateral telescopic adjustment through hole outside the central telescopic through hole for cooperating with the electrically controlled bottom adjustment support rod (3). The telescopic section of the electrically controlled bottom adjustment support rod (3) is fixedly connected to the lower end of the cable terminal body (2) by passing through the lateral telescopic adjustment through hole.

3. A three-core submarine cable fully prefabricated high-voltage power cable terminal according to claim 2, characterized in that: Both the central telescopic through hole and the lateral telescopic adjustment through hole are provided with a top-down recessed hole with an upper opening, and a shock-absorbing spring (6) is installed inside the top-down recessed hole.

4. A three-core submarine cable fully prefabricated high-voltage power cable terminal according to claim 1, characterized in that: An embedded distance monitoring module (12) is fixedly mounted on the upper surface of the fixed bracket (1).

5. A three-core submarine cable prefabricated high-voltage power cable terminal according to claim 1, characterized in that: The upper surface of the cable terminal body (2) is provided with a plurality of strip-shaped control flip grooves (14). The outer closed cover (13) includes an annular closed shell (131) sleeved around the cable terminal body (2) and a strip-shaped extrusion spring (132) installed inside the strip-shaped control flip groove (14). One end of the strip-shaped extrusion spring (132) is fixedly connected to the highest position of the strip-shaped control flip groove (14), and the other end of the strip-shaped extrusion spring (132) is fixedly connected to the inner arc surface of the annular closed shell (131).

6. A three-core submarine cable fully prefabricated high-voltage power cable terminal according to claim 1, characterized in that: The bottom guide tail tube (4) has an elastic telescopic cylinder (15) fixed on its outer side by a lateral bracket for lifting the electrically controlled bottom adjusting support rod (3).

7. A three-core submarine cable fully prefabricated high-voltage power cable terminal according to claim 1, characterized in that: The outer surface of the PE heat shrink umbrella skirt (21) is fixed with lateral reinforcing ribs (16) at the positions corresponding to the electrically controlled bottom adjusting support rods (3) to improve the bending resistance.

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