A high voltage dc crosslinked polyethylene cable preformed joint

Abstract

This invention relates to the field of cable technology, specifically to a prefabricated connector for high-voltage direct current cross-linked polyethylene cables. The connector includes a connecting device comprising a cable, a sheath on one side of the cable, and a connecting plate on the side of the sheath away from the cable. A connecting port is provided inside the connector plate B. It also includes a protective device for fixing connector plates A and B. In the initial state, the rectangular box on connector plate A and the long plate on connector plate B are separated. At this time, the locking post is retracted under the action of the baffle blocking the long rod, and one end of it will not protrude from the sliding channel of the long plate. This solves the problem that during the connection of prefabricated connectors, external pulling can easily cause the cable to loosen from the prefabricated connector, leading to poor interface contact, partial discharge, and insulation breakdown, ultimately causing power transmission interruption and seriously threatening the reliability and safety of the entire DC transmission line.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a prefabricated connector for high-voltage DC cross-linked polyethylene cables. Background Technology

[0002] In the actual laying of high-voltage direct current (HVDC) transmission projects, the manufacturing length of a single cable is often insufficient to meet the requirements of the entire line due to limitations in cable manufacturing, transportation, and terrain conditions. Therefore, it is necessary to reliably connect multiple sections of HVDC cross-linked polyethylene (XLPE) cables of the same model and specifications on-site to achieve continuous power transmission. Thus, the intermediate joint type HVDC cable joint is designed to solve this key technical problem of "insufficient section length." As an indispensable component in the line, it must ensure uniform electric field distribution, reliable sealing, and sufficient mechanical strength at the connection point, thereby guaranteeing the long-term safe and stable operation of the entire HVDC transmission system.

[0003] According to a public disclosure of a power cable connector and its connection process (disclosure number CN115207869A), the power cable connector and its connection process include a first cable and a second cable. The first cable has a fixing component installed at its end, and the second cable has a connecting component installed at its end. The fixing component includes a first fixing tube. This power cable connector and its connection process utilize a connecting tube to protect the connection between the first and second cables. A connecting ring with a sealing gasket is inserted into a connecting groove inside both the first and second fixing tubes, ensuring a tight connection and preventing impurities from entering the cable. When the connecting tube is screwed into the surface of the first fixing tube, the insertion rod is pressed against the surface of the sealing gasket, further securing the connection between the first and second fixing tubes. This design facilitates the secure connection of the cable.

[0004] In the aforementioned device, although the connection between the first and second cables is protected by a connecting pipe to prevent impurities from entering the cable, the cable is prone to loosening due to external pulling, which can lead to poor interface contact, partial discharge, and insulation breakdown, ultimately causing power transmission interruption and seriously threatening the reliability and safety of the entire DC transmission line.

[0005] In view of this, we propose a prefabricated connector for high voltage DC cross-linked polyethylene cables. Summary of the Invention

[0006] The purpose of this invention is to provide a prefabricated connector for high-voltage DC cross-linked polyethylene cables, which solves the problem of cable detachment from the prefabricated connector.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A prefabricated connector for high-voltage direct current cross-linked polyethylene cables includes a connecting device comprising a cable, a sheath on one side of the cable, a connecting plate on the side of the sheath away from the cable, a connector plate A on the side of the connecting plate away from the sheath, a conductor inside connector plate A, and a connector plate B on one side of connector plate A, with a connection port inside connector plate B. The connector also includes a protective device for fixing connector plate A and connector plate B to prevent loosening due to pulling; a protective device for protecting the connection between connector plate A and connector plate B to prevent compression and bending; and a positioning device for positioning the rotating post to prevent accidental rotation.

[0009] Preferably, the protective device includes a long plate, a rectangular box is provided on one side of the long plate, a baffle is provided on one side inside the rectangular box, a connecting block is fixedly connected to one side of the baffle, a spring A is fixedly connected to the side of the connecting block away from the baffle, a long rod is provided at one end of the baffle, a rectangular plate is fixedly connected to the end of the long rod away from the baffle, a spring B is fixedly connected to one side of the rectangular plate, a locking post is fixedly connected to the side of the rectangular plate away from the spring B, a pull rope is fixedly connected to the middle of the side of the rectangular plate near the spring B, a connecting rope is fixedly connected to the end of the pull rope away from the rectangular plate, and a pull ring is fixedly connected to the middle section of the connecting rope.

[0010] Preferably, the bottom of the long plate is disposed on the top circumferential surface of the connector plate B, the surface of the long plate near the rectangular box has a recessed hole, the bottom surface of the long plate has a groove, the bottom of the rectangular box is disposed on the top circumferential surface of the connector plate A, the surface of the rectangular box near the long plate has a through groove, and the long plate can slide through the through groove on the surface of the rectangular box and be disposed inside the rectangular box. The interior of the rectangular box has multiple grooves. The initial state of the baffle is that one end blocks the long rod. The end of the spring A away from the connecting block is fixedly connected to the groove inside the rectangular box. The initial state of the spring A is the natural state, the initial state of the spring B is the compressed state, and the end of the connecting rope away from the pull rope is fixedly connected to the pull rope.

[0011] Preferably, the protective device includes a rectangular block, a spring C fixedly connected to one side of the rectangular block, traction ropes fixedly connected to the upper and lower sides of the rectangular block, a guard plate fixedly connected to the end of the traction rope away from the rectangular block, a rotating shaft hinged to one side of the guard plate, a locking block fixedly connected to the top surface of the guard plate, a locking plate provided above the locking block, a rotating column fixedly connected to one end of the locking plate, a torsion spring fixedly connected to the top of the locking plate, and a rotating plate fixedly connected to one end of the rotating column.

[0012] Preferably, the end of the spring C away from the rectangular block is fixedly connected to a groove on the surface of the connector plate A near the connector plate B. The protective plate is semi-circular in shape, and there are two protective plates distributed on both sides of the connector plate A. A support plate is provided on one side of the rotating shaft, and one side of the support plate is fixedly connected to the two circumferential surfaces of the connector plate A.

[0013] Preferably, one end of the rotating column rotatably passes through both sides of the groove opened on the bottom surface of the long plate, the end of the torsion spring away from the card plate is fixedly connected to the side of the groove opened on the bottom surface of the long plate, the end of the card plate away from the rotating column has an inclined surface, and the circumferential surface of the rotating column near the rotating plate has a concave hole.

[0014] Preferably, the positioning device includes a handle, one end of which is fixedly connected to a slide plate, one side of which is fixedly connected to a spring D, the end of which the spring D is away from the slide plate is fixedly connected to a fixing plate, the side of which the slide plate is away from the spring D is fixedly connected to a limiting plate, and the side of which the limiting plate is away from the slide plate is fixedly connected to a positioning post.

[0015] Preferably, one side of the fixing plate is fixedly connected to the surface of the long plate away from the rectangular box, and the surface of the fixing plate is provided with a sliding groove, and the surface of the sliding plate is slidably connected to the sliding groove provided on the surface of the fixing plate.

[0016] Preferably, the end of the positioning post away from the limiting plate is embedded in a recessed hole on the circumferential surface of the rotating post near the rotating plate.

[0017] Preferably, the surface of the connector plate A near the connector plate B has a groove, and the end of the spring C away from the rectangular block is fixedly connected in the groove.

[0018] By employing the above technical solution, the present invention provides a prefabricated connector for high-voltage DC cross-linked polyethylene cables. It possesses at least the following beneficial effects:

[0019] 1. In the initial state, the rectangular box set on the connector plate A and the long plate set on the connector plate B are separated. At this time, the locking post is in a retracted state under the action of the baffle blocking the long rod, and one end of it will not protrude out of the sliding channel of the long plate. Therefore, it will not hinder the insertion of the long plate. This solves the problem that when the prefabricated connector is connected, the cable is easily pulled away from the prefabricated connector due to external pulling, which leads to poor interface contact, partial discharge and insulation breakdown, and ultimately causes power transmission interruption, seriously threatening the reliability and safety of the entire DC transmission line.

[0020] 2. In the initial state, the two semi-circular protective plates are respectively hinged to the support plate fixedly connected to the circumferential surface of the connector plate A through the pivot on one side, and are in an open state. When the connector is connected, the vertical surface of the locking plate is disengaged from the locking block, thereby releasing the locking of the protective plate. This effectively resists external pulling, lateral compression and bending, and also prevents the connector plate A and connector plate B from loosening, ensuring the reliability of the electrical connection.

[0021] 3. This invention uses a fixing plate to securely connect to a long plate, allowing the sliding plate within the groove to receive continuous elastic thrust on one side via spring D. This force pushes the sliding plate, along with its limiting plate and positioning pin, towards the rotating pin. When the protective device's guard plate closes and the locking plate rebounds to the locked position under the action of the torsion spring, the positioning pin completely disengages from the recess, allowing the rotating plate to be rotated for subsequent operations. This effectively prevents accidental rotation due to vibration or accidental contact, ensuring the protective device is always in its designated safe state. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate the invention, constitute a part of this application:

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the protective plate in this invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the rectangular box in the present invention (section view).

[0026] Figure 4 This is a three-dimensional structural diagram of the connecting rope and the pull ring in this invention;

[0027] Figure 5 This is a three-dimensional structural diagram of the protective plate and the rotating shaft in this invention.

[0028] Figure 6 This is a three-dimensional structural diagram of the long plate section in this invention.

[0029] Figure 7 This is a three-dimensional structural diagram of the fixed plate in the present invention.

[0030] Figure 8 In this invention Figure 7 Enlarged 3D structural diagram at point A.

[0031] In the diagram: 1. Connecting device; 101. Cable; 102. Sheath; 103. Connecting plate; 104. Joint plate A; 105. Wire; 106. Connection port; 107. Joint plate B; 2. Protective device; 201. Long plate; 202. Rectangular box; 203. Baffle; 204. Connecting block; 205. Spring A; 206. Long rod; 207. Rectangular plate; 208. Spring B; 209. Clamping post; 210. Pull rope; 211. Connecting rope; 212. Pull ring; 3. Protective device; 301. Rectangular block; 302. Spring C; 303. Traction rope; 304. Guard plate; 305. Rotating shaft; 306. Locking block; 307. Locking plate; 308. Torsion spring; 309. Rotating column; 310. Rotating plate; 4. Positioning device; 401. Handle; 402. Slide plate; 403. Spring D; 404. Fixing plate; 405. Limiting plate; 406. Positioning column. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] A prefabricated connector for high-voltage DC cross-linked polyethylene cables, such as Figure 1 - Figure 8 As shown, the device includes a connecting device 1, which includes a cable 101. A sheath 102 is provided on one side of the cable 101. A connecting plate 103 is provided on the side of the sheath 102 away from the cable 101. A connector plate A104 is provided on the side of the connecting plate 103 away from the sheath 102. A wire 105 is provided inside the connector plate A104. A connector plate B107 is provided on one side of the connector plate A104. A connection port 106 is provided inside the connector plate B107. The device also includes a protective device 2 for fixing the connector plate A104 and the connector plate B107 to prevent them from being pulled loose. A protective device 3 is used to protect the connection between the connector plate A104 and the connector plate B107 to prevent them from being pressed or bent. A positioning device 4 is used to position the rotating column 309 to prevent accidental rotation.

[0034] Protective device 2 includes a long plate 201, a rectangular box 202 on one side of the long plate 201, a baffle 203 on one side inside the rectangular box 202, a connecting block 204 fixedly connected to one side of the baffle 203, a spring A 205 fixedly connected to the side of the connecting block 204 away from the baffle 203, a long rod 206 on one end of the baffle 203, a rectangular plate 207 fixedly connected to the end of the long rod 206 away from the baffle 203, and a spring B 208 fixedly connected to one side of the rectangular plate 207. A locking post 209 is fixedly connected to the side of plate 207 away from spring B208. A pull rope 210 is fixedly connected to the middle of the side of rectangular plate 207 close to spring B208. A connecting rope 211 is fixedly connected to the end of pull rope 210 away from rectangular plate 207. A pull ring 212 is fixedly connected to the middle section of connecting rope 211. In the above design, the long plate 201 and the rectangular box 202 cooperate with each other to form a sliding guide and locking base, ensuring that the connector plate A104 and the connector plate B107 can be connected and firmly locked.

[0035] The bottom of the long plate 201 is set on the top circumferential surface of the connector plate B107. A recessed hole is formed on the surface of the long plate 201 near the rectangular box 202. A groove is formed on the bottom surface of the long plate 201. The bottom of the rectangular box 202 is set on the top circumferential surface of the connector plate A104. A through groove is formed on the surface of the rectangular box 202 near the long plate 201, and the long plate 201 can slide through the through groove on the surface of the rectangular box 202. The rectangular box 202 is located inside the rectangular box 202, and multiple... The initial state of the groove and baffle 203 is that one end blocks the long rod 206. The end of the spring A205 away from the connecting block 204 is fixedly connected to the groove opened inside the rectangular box 202. The initial state of the spring A205 is the natural state, and the initial state of the spring B208 is the compressed state. The end of the connecting rope 211 away from the pull rope 210 is fixedly connected to the pull rope 210. In the above design, the concave hole opened on the surface of the long plate 201 is used to accommodate the locking post 209. When the locking post 209 is inserted, a mechanical lock is formed.

[0036] The protective device 3 includes a rectangular block 301. A spring C302 is fixedly connected to one side of the rectangular block 301. A traction rope 303 is fixedly connected to the upper and lower sides of the rectangular block 301. A guard plate 304 is fixedly connected to the end of the traction rope 303 away from the rectangular block 301. A rotating shaft 305 is hinged to one side of the guard plate 304. A locking block 306 is fixedly connected to the top surface of the guard plate 304. A locking plate 307 is provided above the locking block 306. A rotating column 309 is fixedly connected to one end of the locking plate 307. A torsion spring 308 is fixedly connected to the top of the locking plate 307. A rotating plate 310 is fixedly connected to one end of the rotating column 309. In the above design, the linear displacement of the rectangular block 301 is converted into the rotational motion of the guard plate 304 around the rotating shaft 305 by the traction rope 303, thereby driving the two semi-circular guard plates 304 to automatically close and form a protective sleeve.

[0037] One end of spring C302 away from rectangular block 301 is fixedly connected to a groove on the surface of connector plate A104 near connector plate B107. The guard plate 304 is semi-circular in shape, and there are two guard plates 304, distributed on both sides of connector plate A104. A support plate is provided on one side of the rotating shaft 305, and one side of the support plate is fixedly connected to the two circumferential surfaces of connector plate A104. In the above design, one end of spring C302 is fixedly connected to the groove of connector plate A104 to provide a restoring force for rectangular block 301.

[0038] One end of the rotating column 309 rotates through the groove on both sides of the bottom surface of the long plate 201. The end of the torsion spring 308 away from the locking plate 307 is fixedly connected to the side of the groove on the bottom surface of the long plate 201. The end of the locking plate 307 away from the rotating column 309 has an inclined surface. The rotating column 309 has a recessed hole on the circumferential surface near the rotating plate 310. In the above design, the torsion spring 308 is fixedly connected to the long plate 201 to provide continuous torsional restoring force to the locking plate 307, ensuring that it can automatically return to its original position and reliably lock the locking block 306 on the guard plate 304.

[0039] The positioning device 4 includes a handle 401, one end of which is fixedly connected to a slide plate 402. A spring D403 is fixedly connected to one side of the slide plate 402. A fixing plate 404 is fixedly connected to the end of the spring D403 away from the slide plate 402. A limiting plate 405 is fixedly connected to the side of the slide plate 402 away from the spring D403. A positioning post 406 is fixedly connected to the side of the limiting plate 405 away from the slide plate 402. In the above design, the handle 401 is fixedly connected to the slide plate 402. Pulling the handle 401 directly drives the slide plate 402 and the positioning post 406 to move forward and backward.

[0040] One side of the fixing plate 404 is fixedly connected to the surface of the long plate 201 away from the rectangular box 202. The surface of the fixing plate 404 is provided with a sliding groove, and the surface of the sliding plate 402 is slidably connected to the sliding groove on the surface of the fixing plate 404. In the above design, the fixing plate 404 is fixedly connected to the long plate 201, providing a stable and reliable installation base for the sliding plate 402 and the spring D403.

[0041] The end of the positioning post 406 away from the limiting plate 405 is embedded in a recessed hole on the circumferential surface of the rotating post 309 near the rotating plate 310. In the above design, the positioning post 406 is embedded in the recessed hole of the rotating post 309 to form a mechanical lock, thereby reliably preventing the locking plate 307 from being accidentally unlocked.

[0042] A groove is provided on the surface of the connector plate A104 near the connector plate B107, and the end of the spring C302 away from the rectangular block 301 is fixedly connected in the groove. In the above design, the groove provides the spring C302 with an installation position and a reliable fixing point.

[0043] In use, the prefabricated high-voltage DC cross-linked polyethylene cable connector of the present invention firstly achieves stress transition and fixation through the connecting plate 103 under the insulation protection of the sheath 102, and then connects to the inside of the connector plate A104, so that the wire 105 set inside the connector plate A104 serves as a conductive path, and forms an electrical connection channel by docking with the pre-set connection port 106 inside the connector plate B107.

[0044] In the initial state, the rectangular box 202 on the connector plate A104 and the long plate 201 on the connector plate B107 are separated. At this time, the locking post 209 is in a retracted state due to the action of the baffle 203 blocking the long rod 206, and one end of it does not protrude from the sliding channel of the long plate 201, so it does not hinder the insertion of the long plate 201. When connection is required, the long plate 201 is moved towards the connector plate A104 by pushing the connector plate B107, so that the long plate 201 passes through the rectangular box 202. The through-slots on the surface slide into the housing. As the long plate 201 slides, when its front end contacts and presses against the baffle 203, it forces the baffle 203 and the connecting block 204 fixedly connected to one side to overcome the spring force of the spring A205 and move backward. When the baffle 203 moves backward to the predetermined position, its end that originally blocked the long rod 206 disengages from the long rod 206, thus releasing the constraint on the long rod 206. At this time, the rectangular plate 207, fixedly connected to the end of the long rod 206 away from the baffle 203, ... Under the thrust of spring B208, the plate is pushed and displaced towards the long plate 201, causing the locking pin 209 fixedly connected to one side of the rectangular plate 207 to move synchronously. This causes one end of the pin to embed into a recessed hole on the surface of the long plate 201, which has now slid into place, thus locking it in place. To unlock, the pull ring 212 is pulled outwards, transmitting tension through the connecting rope 211 and the pull rope 210. This causes the rectangular plate 207 to move away from the long plate 201, overcoming the thrust of spring B208, thus locking the plate in place. The locking post 209 on the rectangular plate 207 is displaced, causing it to disengage from the recessed hole on the surface of the long plate 201, thereby releasing the locking of the long plate 201. Through the above-mentioned movement effect, the loosening of the joint caused by pulling is fundamentally avoided. This solves the problem that when the prefabricated joint is connected, the cable 101 is easily loosened from the prefabricated joint due to external pulling, which leads to poor interface contact, partial discharge and insulation breakdown, ultimately causing power transmission interruption and seriously threatening the reliability and safety of the entire DC transmission line.

[0045] Secondly, in the initial state, the two semi-circular guard plates 304 are hinged to the support plates fixedly connected to the circumference of the joint plate A104 via pivots 305 on one side, and are in an open state. When the joint is connected, as the joint plate B107 moves towards the joint plate A104 and eventually pushes the long plate 201 into the rectangular box 202, one side of the joint plate B107 will first contact and squeeze the rectangular block 301 when it approaches its final position. This causes the rectangular block 301 to be pushed, compressing the spring C302 connected to its rear and moving into the groove in the direction of the joint plate A104. The backward movement of the rectangular block 301 is transmitted to the two guard plates 304 via traction ropes 303 fixedly connected to its upper and lower sides. Then, under the tension of the traction ropes 303, the two guard plates 304 rotate inward around their respective pivots 305. When connector plate A104 and connector plate B107 are fully aligned, the two guard plates 304 rotate and close synchronously, their edges meeting to form a complete annular rigid protective sleeve at the joint connection. To prevent accidental pull-out from the side of connector plate A104, the locking block 306 fixed to its top moves during the closing process of guard plate 304. When guard plate 304 rotates to the closed position, the locking block 306 contacts one end of the guard plate 307, which is rotatably connected to the bottom of long plate 201 via rotating post 309. The locking block 306 then contacts the inclined surface at one end of the guard plate 307, causing the inclined surface to be forced to rotate the guard plate 307 upwards around rotating post 309, thereby compressing the torsion spring 308 at its top. After the locking block 306 has completely passed the tip of the locking plate 307, the locking plate 307 rebounds downward under the restoring force of the torsion spring 308, thereby causing its vertically contoured side to make direct contact and engage with the corresponding side of the locking block 306. This effectively locks the guard plate 304 into a closed state. If the side of connector plate A104 is subjected to tension, the force will be transmitted to the locking block 306 through the guard plate 304. Since the locking block 306 is firmly blocked by the vertical surface of the locking plate 307, the tension is distributed to the entire protective device 3 and the locking structure of the long plate 201 and the rectangular box 202, thereby significantly improving the connector's ability to resist reverse pull-out. When the connector needs to be disassembled, firstly, the rotating plate 310 fixedly connected to one end of the rotating column 309 is rotated, thereby driving the rotating column 309 and the locking plate 307 to rotate upward against the force of the torsion spring 308, so that the vertical surface of the locking plate 307 is disengaged from the locking block 306, thereby releasing the locking of the guard plate 304, thus effectively resisting external pulling, lateral compression and bending, and also preventing connector plate A104 and connector plate B107 from loosening, ensuring the reliability of the electrical connection.

[0046] Finally, the fixed plate 404 is fixedly connected to the long plate 201, so that the slide plate 402 in the groove receives a continuous elastic thrust on one side through the spring D403. This force pushes the slide plate 402, along with the limiting plate 405 and the positioning post 406, towards the rotating post 309. When the guard plate 304 of the protective device 3 closes and the locking plate 307 rebounds to the locked position under the action of the torsion spring 308, the concave hole on the circumferential surface of the rotating post 309 rotates to the position aligned with the positioning post 406. Then, under the push of the spring D403, one end of the positioning post 406 is inserted into the concave hole, forming a positioning and thus restricting the rotational freedom of the rotating post 309. This ensures that the locking relationship between the locking plate 307 and the locking block 306 is stable. When unlocking is required, by pulling the handle 401, the elastic force of the spring D403 is overcome, causing the slide plate 402 to move backward, driving the positioning post 406 to completely retract from the concave hole, and then the rotating plate 310 can be rotated for subsequent operations. This effectively prevents accidental rotation caused by vibration or accidental contact, ensuring that the protection device 3 is always in the set safe state.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated connector for high-voltage DC cross-linked polyethylene cables, comprising a connecting device (1), characterized in that: The connecting device (1) includes a cable (101), a sheath (102) is provided on one side of the cable (101), a connecting plate (103) is provided on the side of the sheath (102) away from the cable (101), a connector plate A (104) is provided on the side of the connecting plate (103) away from the sheath (102), a wire (105) is provided inside the connector plate A (104), a connector plate B (107) is provided on one side of the connector plate A (104), and a connection port (106) is provided inside the connector plate B (107). It also includes a protective device (2) for fixing the joint plate A (104) and the joint plate B (107) to prevent them from being pulled loose; The protective device (3) is used to protect the connection between the joint plate A (104) and the joint plate B (107) from being pressed and bent. The positioning device (4) is used to position the rotating column (309) to prevent accidental rotation.

2. The prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 1, characterized in that: The protective device (2) includes a long plate (201), a rectangular box (202) is provided on one side of the long plate (201), a baffle (203) is provided on one side inside the rectangular box (202), a connecting block (204) is fixedly connected to one side of the baffle (203), a spring A (205) is fixedly connected to the side of the connecting block (204) away from the baffle (203), a long rod (206) is provided at one end of the baffle (203), and the end of the long rod (206) away from the baffle (203) is fixedly connected to the spring A (205). A rectangular plate (207) is fixedly connected to the rectangular plate (207). A spring B (208) is fixedly connected to one side of the rectangular plate (207). A locking post (209) is fixedly connected to the side of the rectangular plate (207) away from the spring B (208). A pull rope (210) is fixedly connected to the middle of the side of the rectangular plate (207) close to the spring B (208). A connecting rope (211) is fixedly connected to the end of the pull rope (210) away from the rectangular plate (207). A pull ring (212) is fixedly connected to the middle section of the connecting rope (211).

3. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 2, characterized in that: The bottom of the long plate (201) is disposed on the top circumferential surface of the connector plate B (107). A recessed hole is formed on the surface of the long plate (201) near the rectangular box (202). A groove is formed on the bottom surface of the long plate (201). The bottom of the rectangular box (202) is disposed on the top circumferential surface of the connector plate A (104). A through groove is formed on the surface of the rectangular box (202) near the long plate (201), and the long plate (201) can slide through the through groove on the surface of the rectangular box (202). (202) Inside, the rectangular box (202) has multiple grooves. The baffle (203) is initially blocking the long rod (206) at one end. The end of the spring A (205) away from the connecting block (204) is fixedly connected to the groove inside the rectangular box (202). The spring A (205) is initially in a natural state. The spring B (208) is initially in a compressed state. The end of the connecting rope (211) away from the pull rope (210) is fixedly connected to the pull rope (210).

4. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 1, characterized in that: The protective device (3) includes a rectangular block (301), a spring C (302) is fixedly connected to one side of the rectangular block (301), a traction rope (303) is fixedly connected to the upper and lower sides of the rectangular block (301), a guard plate (304) is fixedly connected to one end of the traction rope (303) away from the rectangular block (301), a rotating shaft (305) is hinged to one side of the guard plate (304), a locking block (306) is fixedly connected to the top surface of the guard plate (304), a locking plate (307) is provided above the locking block (306), a rotating column (309) is fixedly connected to one end of the locking plate (307), a torsion spring (308) is fixedly connected to the top of the locking plate (307), and a rotating plate (310) is fixedly connected to one end of the rotating column (309).

5. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 4, characterized in that: The end of the spring C (302) away from the rectangular block (301) is fixedly connected to a groove on the surface of the connector plate A (104) near the connector plate B (107). The guard plate (304) is semi-circular in shape, and there are two guard plates (304) distributed on both sides of the connector plate A (104). A support plate is provided on one side of the rotating shaft (305), and one side of the support plate is fixedly connected to the two circumferential surfaces of the connector plate A (104).

6. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 4, characterized in that: One end of the rotating column (309) rotates through the groove on both sides of the bottom surface of the long plate (201). The end of the torsion spring (308) away from the card plate (307) is fixedly connected to the side of the groove on the bottom surface of the long plate (201). The end of the card plate (307) away from the rotating column (309) has an inclined surface. The rotating column (309) has a concave hole on the circumferential surface near the rotating plate (310).

7. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 1, characterized in that: The positioning device (4) includes a handle (401), one end of which is fixedly connected to a slide plate (402), one side of which is fixedly connected to a spring D (403), one end of which is fixedly connected to a fixing plate (404) away from the slide plate (402), one side of which is fixedly connected to a limiting plate (405) away from the spring D (403), and one side of which is fixedly connected to a positioning post (406) away from the slide plate (402).

8. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 7, characterized in that: One side of the fixing plate (404) is fixedly connected to the surface of the long plate (201) away from the rectangular box (202). The surface of the fixing plate (404) is provided with a sliding groove, and the surface of the sliding plate (402) is slidably connected to the sliding groove provided on the surface of the fixing plate (404).

9. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 7, characterized in that: The end of the positioning post (406) away from the limiting plate (405) is embedded in a recessed hole on the circumferential surface of the rotating post (309) near the rotating plate (310).

10. A prefabricated connector for a high-voltage DC cross-linked polyethylene cable according to claim 1, characterized in that: The surface of the connector plate A (104) near the connector plate B (107) has a groove, and the end of the spring C (302) away from the rectangular block (301) is fixedly connected in the groove.

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