110kV high-voltage polypropylene power cable

Abstract

The invention discloses a 110kV high-voltage polypropylene power cable, and relates to the technical field of power cables, and the 110kV high-voltage polypropylene power cable comprises an outer sheath, a conductor is installed in the outer sheath, the conductor is sleeved with a cable core sleeve, a shielding sleeve is embedded in the outer wall of the cable core sleeve, an inner spacer bush is installed on the inner side of the outer sheath, and an outer spacer bush is installed on the outer side of the inner spacer bush. According to the invention, bidirectional limiting and locking protection of the inside and the outside of the cable can be realized, multiple supports are provided for the inside of the cable, the internal stress stability of the cable in the use process is effectively balanced, and the service life of the cable is prolonged. The interface compatibility among the structures in the cable is equivalently improved, the interface air gap generated by the thermal shrinkage of polypropylene is effectively compensated, the double restraint of water branches and electric branches is realized, the multiple optimization of the mechanical performance is structurally realized, the stability of the electric insulation performance is improved, and the effective service life of the cable is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power cable, in particular to a 110kV high-voltage polypropylene power cable. BACKGROUND

[0002] Cross-linked polyethylene cable has been the mainstream choice for 110kV voltage grade power transmission for a long time, however, XLPE cable has problems such as non-recyclable, high production energy consumption, etc., with the increasing requirements of environmental protection and the growing demand for power grid reliability, developing new environmentally friendly and high-performance cable insulation materials has become an industry trend, 110kV high-voltage polypropylene power cable is a major technological breakthrough in the field of power transmission in China in recent years, its core advantages lie in material innovation, production efficiency improvement and performance optimization; However, the inherent material properties of the current polypropylene power cable make its protective effect on the cable poor, it is easy to be damaged too quickly due to insufficient mechanical strength, the interface compatibility of the cable with the internal structure is poor, it is easy to produce interface air gap between the cable and the internal structure due to the difference in thermal shrinkage rate, so that the cable is easy to produce water tree and electrical tree in the use process, resulting in failure of the cable insulation performance and accelerating the aging of the cable. SUMMARY

[0003] The present application provides a 110kV high-voltage polypropylene power cable, which can effectively solve the problem of the current polypropylene power cable, the inherent material properties of the polypropylene make its protective effect on the cable poor, it is easy to be damaged too quickly due to insufficient mechanical strength, the interface compatibility of the cable with the internal structure is poor, it is easy to produce interface air gap between the cable and the internal structure due to the difference in thermal shrinkage rate, so that the cable is easy to produce water tree and electrical tree in the use process, resulting in failure of the cable insulation performance and accelerating the aging of the cable.

[0004] To achieve the above purpose, the present application provides the following technical scheme: a 110kV high-voltage polypropylene power cable, comprising an outer sheath, a conductor is installed inside the outer sheath, a cable core sleeve is sleeved outside the conductor, a shielding sleeve is embedded and installed on the outer wall of the cable core sleeve, and a composite compensation mechanism is installed outside the shielding sleeve. The composite compensation mechanism comprises an inner spacer sleeve. An inner spacer sleeve is installed inside the outer sheath, a plurality of heat conduction blocks are uniformly installed at equal intervals on the outer wall of the inner spacer sleeve, a binding sleeve is sleeved outside the inner spacer sleeve, a water absorbing agent is filled in the binding sleeve, a slot is arranged on the outer wall of the binding sleeve corresponding to the position of the heat conduction block, a plurality of lock rings are embedded and installed at equal intervals on the outer wall of the outer sheath, and a plurality of strips are installed at equal angles along the circumferential direction on the side end face of the lock ring. The equal-diameter uniform shield sleeve is externally provided with a plurality of ring frames, the side end face of the ring frame is externally provided with a plurality of cable sleeves at equal angles in the circumferential direction, the cable sleeve is internally provided with a cable strip, the end of the cable strip is provided with a stud, the outer sheath is provided with an end cover, the side end face of the end cover is embedded with a sliding ring, the sliding ring is externally provided with a plurality of compression springs at equal angles in the circumferential direction, and the end of the stud is externally provided with a nut through screw threads.

[0005] Preferably, the outer wall of the shield sleeve is sleeved with a gasket, the inner wall of the ring frame is provided with a ring plate at the middle portion, the side end face of the ring plate is provided with a concave-convex ring strip at both sides, and the outer wall of the gasket is provided with a ring groove at the position corresponding to the ring plate. The outer side of the cable strip is externally provided with a plurality of clamping pads at equal angles in the circumferential direction at the gap position between the ring frames, the inner wall of the clamping pad is symmetrically provided with a groove, the outer curved edge of the ring frame is provided with a separation ring, and the inner wall of the end cover is provided with a sealing gasket.

[0006] Preferably, the side end face of the end cover is provided with a perforation at the position corresponding to the cable strip, the sliding ring is connected with the end cover through the compression spring, the end cover is slidingly connected with the stud, the outer part of the stud is a half-thread structure, the stud penetrates through the sliding ring and is slidingly connected with the sliding ring.

[0007] Preferably, the inner gap of the inner separation sleeve is filled with liquid heat-conducting silicone grease at the gap position between the ring frames, the restraint sleeve is an elastic net structure, and the water absorbent is a superabsorbent resin powder.

[0008] Preferably, the ring frame is slidingly connected with the gasket, the ring plate is connected with the end face of the groove through the concave-convex ring strip, the concave-convex ring strip is an elastic member, the concave-convex ring strip is in a ring-shaped wave shape, the inner wall of the gasket is provided with a plurality of convex rings at equal distances, the gasket and the convex ring are sealingly fitted with the cable core sleeve, the clamping pad and the groove are in an arc shape, and the groove is fitted with the cable strip.

[0009] Preferably, the conductor is an annealed soft copper layered and tightly pressed circular strand, and the outer sheath is a polypropylene nanocomposite material. Preferably, the end cover is provided with an integral connection mechanism at the end portion. The integral connection mechanism comprises a base plate. One side of the end cover is provided with a base plate, the side end face of the base plate is embedded with a crimping tube at the middle portion, the outer curved surface of the crimping tube is provided with a hollow ring at the middle portion, the outer curved surface of the base plate is provided with a guide tube, the end face of the guide tube is provided with a heat shrink tube, the inner part of the hollow ring is symmetrically slidingly provided with a ring gasket, the side end face of the ring gasket is provided with a plurality of pull rods at equal angles in the circumferential direction, the end of the pull rod is provided with a nut, the end of the stud is provided with a screw hole, the nut and the stud are connected through a pull rope, both ends of the pull rope are provided with a screw head, and both ends of the hollow ring are provided with a plurality of through holes at equal angles in the circumferential direction. The end cap end is provided with a ring box, a sliding pad is slidably arranged in the ring box, a plurality of connecting rods are equiangularly arranged on the side end surface of the sliding pad in the circumferential direction, connecting heads are arranged on the end of the connecting rods, a plurality of guide openings are equiangularly arranged on the end surface of the ring box in the circumferential direction, and a plurality of connecting holes are equiangularly arranged on the outer curved surface of the base plate in the circumferential direction. The inner part of the protective cylinder is symmetrically provided with annular plugs, a plurality of springs are equiangularly arranged on the side end surface of the annular plugs in the circumferential direction, a convex rib is arranged between the two annular plugs, a plurality of guide holes are equiangularly arranged on the outer curved surface of the convex rib in the circumferential direction, a through hole is arranged on the side end surface of the base plate corresponding to the position of the guide hole, and a pouring valve is arranged on the outer curved surface of the protective cylinder.

[0010] Preferably, the pull rod is slidably connected with the hollow ring, the nut and the screw opening are matched with the screw head, and the nut and the screw opening are connected with the screw head through threads, and the pull rope is an elastic strip.

[0011] Preferably, the connecting rod is slidably connected with the ring box, the connecting head is connected with the connecting hole through threads, and the orientation of the connecting rod is opposite to the orientation of the connecting hole.

[0012] Preferably, the gap between the two annular plugs in the inner part of the protective cylinder is communicated with the through hole and the guide hole, and the through hole, the through opening and the guide opening are communicated with the space outside the compression tube.

[0013] Compared with the prior art, the application has the advantages that the structure is scientific and reasonable, and the use is safe and convenient. 1. The composite compensation mechanism is provided, and the inner spacer sleeve, the heat conducting block, the restraint sleeve, the slot, the lock ring and the strip are matched to form a double-direction lock protection structure of the outer layer, realize the double reinforcement of the outer sheath, on one hand, the stable and reliable limiting locking force is given to the outer sheath, the mechanical properties of the polypropylene material are compensated and optimized in structure, the tear strength and impact resistance are equivalent enhanced, the high expansion of the water absorbing agent is fully utilized, the high heat shrinkage of the polypropylene is effectively compatible, the interface gap generated by the shrinkage difference is effectively filled, the growth of the electric tree is effectively inhibited, the longitudinal migration of water is effectively blocked, the water tree aging caused by chronic penetration is effectively avoided, the mechanical protection stability is further ensured, the insulation breakdown field strength is effectively improved, the insulation performance stability of the cable is fully ensured, and the effective service life of the cable is greatly strengthened. On the other hand, the ring frame, the cable sleeve, the cable strip, the stud, the end cover, the slip ring, the compression spring and the nut can be matched to form an internal support structure. With the circumferential limiting action of the clamping pad, the groove, the isolation ring and the sealing pad, and the dynamic filling action of the heat-conducting silicone grease, a double support mechanism can be formed. Not only can it buffer and protect the external tensile force, extrusion force and bending force, and conduct and differentiate them along the cable axial and circumferential directions, but also can effectively balance the internal stress of the cable, fully utilize the heat conductivity of the heat-conducting silicone grease to promote heat dissipation, make the conductor and the outer sheath more compact, fill the interface air gap, equivalently improve the interface compatibility, balance the interface stress, further ensure the insulation performance, and realize internal and external double heat conduction with the heat-conducting block to achieve rapid heat dissipation. In addition, the elastic limiting action of the pad sleeve, the ring plate, the ring groove and the concave-convex ring strip can improve the fit of the outer sheath and the conductor, realize double stress relief, and further effectively strengthen the polypropylene outer sheath.

[0014] 2. An integrated connection mechanism is provided. Through the cooperation of the base plate, the crimping pipe, the hollow ring, the casing and the heat shrink tube, an end protection structure can be effectively formed to effectively strengthen the connection reliability of the cable end while improving the convenience of cable connection. In addition, the synchronous linkage action of the ring pad, the pull rod, the screw cap, the screw port, the pull rope and the screw head can conduct the tensile, extrusion and bending stress received by the cable during use, and can be matched with the ring box, the sliding pad, the connecting rod, the connector and the connecting hole to realize double limiting and form a bidirectional interlocking mechanism. Not only can it synchronously transfer the external tensile, extrusion and bending stress received by the cable main body to balance the stress stability between the cables and further improve the environmental stress cracking resistance of the cable, but also can convert the tensile, extrusion and bending stress into connection stress between the cables to improve the connection stability between the cables. On the other hand, the ring-shaped plug, the spring and the convex rib can be matched to form an end stress relief buffer structure to effectively maintain the internal stress stability of the cable connection. In addition, it can be matched with the composite compensation mechanism to form a cooperative stress relief mechanism inside the cable and between the cables. It can not only guarantee the compactness and stability of the cable, but also provide more sufficient stress relief buffer gap for the cable, provide a more reliable sealing and filling space for the cable connection, effectively utilize the flowability and heat conductivity of the insulating oil to promote rapid heat dissipation at the joint, and further strengthen the heat stability of the cable during use and improve the insulation performance of the cable. Through the cooperation of the guide hole, the through hole and the injection valve, rapid injection and flow of the insulating oil can be realized, and the stability and smoothness of pressure conduction can be improved to ensure the smoothness of the cable in use.

[0015] In summary, this cable achieves multiple reinforcements to the polypropylene sheath. It fully utilizes the high temperature resistance, low dielectric loss, and recyclability of polypropylene material, fundamentally addressing the industry pain points of traditional cables' non-recyclability and high carbon footprint. Simultaneously, it provides bidirectional limiting and locking protection both inside and outside the cable, offering multiple internal supports to effectively balance internal stress stability during use. This effectively improves the interface compatibility between various internal structures, effectively compensates for interface gaps caused by polypropylene heat shrinkage, and achieves dual containment of water and electrical trees. Structurally, it optimizes the cable's mechanical properties, enhances the stability of its electrical insulation performance, and increases its effective service life. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the conductor mounting structure of the present invention; Figure 3 This is a schematic diagram of the composite compensation mechanism of the present invention; Figure 4 This is a schematic diagram of the restraint sleeve installation structure of the present invention; Figure 5 This is a schematic diagram of the heat-conducting block installation structure of the present invention; Figure 6 This is a partial exploded view of the present invention; Figure 7 This is a schematic diagram of the end cap mounting structure of the present invention; Figure 8 This is a schematic diagram of the ring box mounting structure of the present invention; Figure 9 This is a schematic diagram of the integrated connection mechanism structure of the present invention; Figure 10 This is a schematic diagram of the hollow ring mounting structure of the present invention; The diagram labels are: 1. Outer sheath; 11. Conductor; 12. Cable core sleeve; 13. Shielding sleeve; 20. Composite compensation mechanism; 201. Inner spacer; 202. Heat-conducting block; 203. Restraint sleeve; 204. Groove; 205. Water absorbent; 206. Locking ring; 207. Strip; 208. Ring frame; 209. Cable sleeve; 210. Cable strip; 211. Stud; 212. End cap; 213. Slip ring; 214. Compression spring; 215. Nut; 216. Washer sleeve; 217. Ring plate; 218. Ring groove; 219. Concave and convex ring strips; 220. Gasket; 221. Groove; 222. Isolation ring; 223. Sealing gasket; 21. Perforation; 22. Raised ring; 30. Integrated connecting mechanism; 301. Base plate; 302. Press-fit tube; 303. Hollow ring; 304. Protective sleeve; 305. Heat shrink tubing; 306. Ring washer; 307. Pull rod; 308. Nut; 309. Threaded end; 310. Pull rope; 311. Thread head; 312. Through port; 313. Ring box; 314. Sliding pad; 315. Connecting rod; 316. Connector; 317. Connecting hole; 318. Ring plug; 319. Spring; 320. Raised rib; 321. Guide hole; 322. Through hole; 323. Injection valve; 324. Guide port. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] Example: Figures 1-10 As shown, the present invention provides a technical solution: a 110kV high-voltage polypropylene power cable, including an outer sheath 1, a conductor 11 installed inside the outer sheath 1, the conductor 11 being made of annealed soft copper layered tightly pressed circular stranding, the outer sheath 1 being made of polypropylene nanocomposite material to improve the environmental friendliness and transmission effect of the cable, a cable core sleeve 12 being sleeved on the outside of the conductor 11, a shielding sleeve 13 being embedded in the outer wall of the cable core sleeve 12, and a composite compensation mechanism 20 being installed on the outside of the shielding sleeve 13; The composite compensation mechanism 20 includes an inner sleeve 201; An inner spacer 201 is installed on the inner side of the outer sheath 1. Several heat-conducting blocks 202 are evenly installed on the outer wall of the inner spacer 201 at equal intervals. A binding sleeve 203 is sleeved on the outer side of the inner spacer 201. The binding sleeve 203 is filled with a water-absorbing agent 205. A groove 204 is provided on the outer wall of the binding sleeve 203 at the position corresponding to the heat-conducting block 202. Several locking rings 206 are evenly embedded in the outer wall of the outer sheath 1 at equal intervals. Several strips 207 are installed at equal angles along the circumferential direction on the side end face of the locking rings 206. A plurality of ring frames 208 are uniformly and equidistantly arranged outside the shielding sleeve 13, and liquid heat-conducting silicone grease is filled in the gap between the ring frames 208 inside the inner spacer sleeve 201. The binding sleeve 203 is of an elastic net structure, and the water absorbent 205 is a super absorbent resin powder, so as to improve waterproofness and interface compatibility. A plurality of cable sleeves 209 are equiangularly arranged on the side end surface of the ring frame 208 in the circumferential direction, the cable sleeve 209 is internally penetrated by a cable 210, the end of the cable 210 is provided with a stud 211, the end cover 212 is arranged at the end of the outer protective sleeve 1, and the slide ring 213 is embedded and slidingly arranged on the side end surface of the end cover 212. The heat-conducting block 202 and the liquid heat-conducting silicone grease form a multi-stage heat conduction path from the conductor 11 to the outer protective sleeve 1, so as to quickly conduct the heat generated during operation, and improve the overall heat dissipation performance and thermal stability. A plurality of compression springs 214 are equiangularly arranged on the side end surface of the slide ring 213 in the circumferential direction, a plurality of perforations 21 are arranged on the end cover 212 at positions corresponding to the cable 210, the slide ring 213 is connected to the end cover 212 through the compression spring 214, the end cover 212 is slidingly connected to the stud 211, the stud 211 is of a half-thread structure, the stud 211 penetrates through the slide ring 213 and is slidingly connected to the slide ring 213, so as to provide internal unloading support protection, and the stud 211 is provided with a nut 215 at the end through screwing.

[0020] The shielding sleeve 13 is sleeved with a gasket 216, the ring frame 208 is provided with a ring plate 217 in the middle of the inner wall, the recessed and convex ring strips 219 are arranged on the two side end surfaces of the ring plate 217, and the gasket 216 is provided with a ring groove 218 at a position corresponding to the ring plate 217. A plurality of clamping pads 220 are equiangularly arranged on the outer side of the cable 210 in the circumferential direction at positions corresponding to the ring frame 208, the inner wall of the clamping pad 220 is symmetrically provided with a recess 221, the ring frame 208 is slidingly connected to the gasket 216, the ring plate 217 is connected to the end surface of the recess 221 through the recessed and convex ring strips 219, the recessed and convex ring strips 219 are elastic members, the recessed and convex ring strips 219 are in a ring wave shape, a plurality of convex rings 22 are equidistantly and uniformly arranged on the inner wall of the gasket 216, and the gasket 216 and the convex rings 22 are sealingly matched with the cable core sleeve 12. The clamping pad 220 and the recess 221 are in an arc shape, and the recess 221 is matched with the cable 210, so as to improve the compactness and stability of the internal structure. The ring frame 208 is provided with an isolation ring 222 on the outer curved surface edge, and the end cover 212 is provided with a sealing gasket 223 on the inner wall.

[0021] The end cover 212 is provided with an integrated connection mechanism 30 at the end. The integrated connection mechanism 30 comprises a base plate 301. The end cover 212 is provided with a base plate 301 on one side, a crimping pipe 302 is embedded and installed in the middle of the side end face of the base plate 301, a hollow ring 303 is installed in the middle of the outer curved surface of the crimping pipe 302, a bushing 304 is installed on the outer curved surface of the base plate 301, a heat shrink tube 305 is installed on the end face of the bushing 304, ring pads 306 are symmetrically and slidingly installed in the hollow ring 303, a plurality of pull rods 307 are installed at equal angles along the circumferential direction on the side end face of the ring pad 306, screw nuts 308 are installed at the ends of the pull rods 307, screw holes 309 are formed at the ends of the threaded studs 211, the screw nuts 308 and the threaded studs 211 are connected through pull ropes 310, screw heads 311 are installed at both ends of the pull ropes 310, the pull rods 307 are slidingly connected with the hollow ring 303, the screw nuts 308 and the screw holes 309 are matched with the screw heads 311, and the screw nuts 308 and the screw holes 309 are connected with the screw heads 311 through threads, the pull ropes 310 are elastic strips for linkage transmission, and a plurality of through holes 312 are formed at equal angles along the circumferential direction at both ends of the hollow ring 303. The end cover 212 is provided with a ring box 313 at the end, a sliding pad 314 is slidingly installed in the ring box 313, a plurality of connecting rods 315 are rotatably installed at equal angles along the circumferential direction on the side end face of the sliding pad 314, connecting heads 316 are installed at the ends of the connecting rods 315, a plurality of guide holes 324 are formed at equal angles along the circumferential direction on the end face of the ring box 313, a plurality of connecting holes 317 are formed at equal angles along the circumferential direction on the outer curved surface of the base plate 301, the connecting rods 315 are slidingly connected with the ring box 313, the connecting heads 316 are connected with the connecting holes 317 through threads, and the orientation of the connecting rods 315 is opposite to the orientation of the connecting holes 317, so as to improve the connection stability. The bushing 304 is symmetrically and slidingly provided with annular plugs 318, a plurality of springs 319 are installed at equal angles along the circumferential direction on the side end face of the annular plugs 318, a protruding rib 320 is arranged between the two annular plugs 318 in the bushing 304, a plurality of guide holes 321 are formed at equal angles along the circumferential direction on the outer curved surface of the protruding rib 320, through holes 322 are formed at positions corresponding to the guide holes 321 on the side end face of the base plate 301, the gap between the two annular plugs 318 in the bushing 304 is communicated with the through holes 322 through the guide holes 321, the through holes 322, the through holes 312 and the guide holes 324 are all communicated with the space outside the crimping pipe 302, so as to improve the smoothness of transmission, balance the internal pressure, and set an injection valve 323 in the middle of the outer curved surface of the bushing 304, the injection valve 323 is provided with a one-way check structure for preventing backflow or bubble back absorption of insulating oil under pressure change, so as to ensure the safety and reliability of the injection process.

[0022] The working principle and use process of the application: when the 110kV high-voltage polypropylene power cable is used, first, according to the total length requirement of the actual use of the cable, according to the length of the single cable, the corresponding number of cables is selected, and after the cable is pulled and transported to the installation position, the cables are connected in turn through the integral connection mechanism 30, and after the cable end is connected with the corresponding external equipment, it can be formally put into use; Before the connection work of the cable is carried out, according to the actual use scene requirement, the nut 215 is rotated, and under the elastic limiting action of the compression spring 214, the slip ring 213 will give the nut 215 stable support, and then in the rotating process of the nut 215, the stud 211 is driven to displace through the thread, and the cord 210 is pulled and pulled by the stud 211, so that the cord 210 is taut, and each gasket 220 is also extruded by the cord 210 under the limiting of the groove 221, so as to more stably abut against the inner spacer sleeve 201, and give it elastic support, and cooperate with the heat conducting block 202 and the restraint sleeve 203 to give the outer sheath 1 sufficient elastic support force; In the process of rotating the nut 215, while the cord 210 is elastically pulled, it will also pull the nut 215 in the opposite direction through the stud 211, so that the slip ring 213 is extruded under the extrusion of the nut 215, and the compression spring 214 is extruded, so that the extrusion force of the compression spring 214 and the elastic pulling force of the cord 210 remain in dynamic balance. By rotating the nut 215, the initial compression amount of the compression spring 214 can be adjusted, that is, the initial elastic support force of the slip ring 213, which synchronously limits the pulling force of the cord 210, adjusts the tensioning force in the working process, so as to balance the bending flexibility, tensile strength and buffer unloading capacity according to the actual requirement; The foregoing adjustment is defaulted to be adjusted and calibrated when the cable is factory-finished, so that in the installation and construction process, only when there is a specific requirement for the bending flexibility, tensile strength and buffer unloading capacity of the cable, the operation adjustment needs to be performed, and when there is no special requirement, the foregoing adjustment process can be ignored and skipped, and the next step of the cable connection work is directly performed; When the cable is connected, first, the compression fitting pipe 302 is sleeved on the conductor 11 end of the cable to be connected, and the compression fitting pipe 302 is stably compression fitted with the conductor 11 end by using an external compression fitting device, then the screw head 311 at both ends of the pull rope 310 is screwed into the screw cap 308 and the screw hole 309 at the end of the stud 211 respectively, each screw cap 308 and stud 211 is connected in series, then the connecting rod 315 is rotated, the connecting head 316 is screwed into the connecting hole 317, and the heat shrink tube 305 is sleeved on the outside of the cable; It should be noted here that in the default state, the cable end has been connected and fixed with the integrated adapter mechanism 30, and during construction, only the integrated adapter mechanism 30 needs to be connected and fixed at the end of the adjacent cable that is not installed with the integrated adapter mechanism 30 through the foregoing steps, and after that, the heat shrink tube 305 on both sides of the protective sleeve 304 is baked using an external heating device to make it shrink and tightly hold the outer sheath 1 of the cable on both sides, thereby completing the preliminary connection; Subsequently, through the injection valve 323, insulating oil is injected into the protective sleeve 304, filling the gap between the two annular plugs 318, and under the communication of the guide hole 321 and the through hole 322, the insulating oil will pass through the guide hole 321 and the through hole 322 to fill the space outside the crimping tube 302, thereby strengthening the protection effect of the connection during the use of the cable, and providing auxiliary insulation, cooling and arc extinguishing; And under the communication of the through port 312, the insulating oil will enter the hollow ring 303 through the through port 312, and the ring pad 306 will drag the pull rod 307 to slide along the hollow ring 303 under the extrusion of the ring pad 306, and the pull rope 310 will be tensioned under the limiting of the screw nut 308, and further will drag the cord 210 through the stud 211 to compensate the elastic support force provided by the compression spring 214; At the same time, under the communication of the through hole 322, the insulating oil will pass through the through hole 322 to enter the ring box 313, forcing the sliding pad 314 to drag the connecting rod 315 under the extrusion of the insulating oil, and under the limiting of the connecting head 316 and the connecting hole 317, the base plate 301 is synchronously dragged, further strengthening the connection stability of the composite compensation mechanism 20 and the cable end, and because the direction of the insulating oil extruding the ring pad 306 is opposite to the direction of the insulating oil extruding the sliding pad 314, and under the communication of the through hole 322, the insulating oil will synchronously extrude the ring pad 306 and the sliding pad 314 on both sides, here a hydraulic interlocking mechanism can be formed; Under the traction of the pull rope 310, the pressure of the insulating oil is further transmitted to the two sides of the cord 210, balancing the tension of the internal cord 210 of the two cables, and under the transmission of the cord 210, the support force received by each clamping pad 220 is also balanced, and the elastic support force received by the outer sheath 1 of the adjacent two cables is also balanced synchronously, thereby realizing the integration of the two cables, and improving the stability and reliability of the cable connection; It should be noted here that during construction, the insulating oil injected into the injection valve 323 can be selected according to actual needs, and in the foregoing process, i.e. in the default state, the injected insulating oil is biodegradable vegetable ester insulating oil, and at the same time, the external insulating shielding tape and sealing tape can be wound on the outside of the integrated adapter mechanism 30 in sequence, which is used in conjunction with the foregoing to further improve the insulating shielding performance and sealing performance of the connection; The selected plant ester insulating oil has good thermal stability and low temperature fluidity, and the applicable temperature range is -40 DEG C to 120 DEG C, which can meet the insulation and cooling requirements under the operating condition of 110 kV high voltage; And in the process of using the cable, when the cable is subjected to external force pulling, extrusion and twisting bending, under the limiting of the end cover 212, the slip ring 213 and the nut 215, the cable 210 will be synchronously pulled, which will synchronously drag each ring support 208 through the cable sleeve 209, so that each concave-convex ring strip 219 is synchronously extruded, and the external force is preliminarily offset and buffered, at the same time, each ring support 208 will synchronously extrude the thermal conductive silicone grease in the gap, the thermal conductive silicone grease will further unload and buffer the external force, and in the transmission process of the thermal conductive silicone grease, the force will be conducted and dispersed along the axial direction of the cable, so that the cable obtains sufficient support force to resist the external pulling, extrusion and twisting bending force; When the pull rope 310 is linked, the pull rod 307 is synchronously stressed, the ring pad 306 is compressed and extruded to insulating oil, a pressure transmission closed loop is formed, the slide pad 314 is synchronously lifted, the joint interlocking stability is enhanced, the bidirectional interlocking degree of the cable connection is synchronously enhanced, the stability of the joint is ensured, and the cable connection is synchronously lifted. The cable connection is subjected to pulling and extrusion, the extrusion force of the insulating oil is also synchronously conducted to the cable inside the cable, and the external force is dispersed and resolved along the axial direction of the cable through the cable strip 210 by the foregoing mechanism; At the same time, the thermal conductive silicone grease cooperates with the clamping pad 220 to support the inner spacer sleeve 201, forming a double support mechanism, which can improve the support stability of the outer sheath 1, so that it can obtain sufficient support force to resist external force, promote heat dissipation by taking advantage of the thermal conductivity of the thermal conductive silicone grease, and make the conductor 11 and the outer sheath 1 more compact, fill the interface air gap and improve the interface compatibility; Similarly, in the process of using the cable, after the external water vapor penetrates the outer sheath 1, it will be absorbed by the water absorbing agent 205, i.e. superabsorbent resin powder, in the binding sleeve 203. After absorbing water, the superabsorbent resin powder will swell to form a gel, blocking the vertical migration of water, improving the waterproofness, providing auxiliary elastic support, and making up for the defect of high thermal shrinkage rate of polypropylene, fully filling the interface gap, and absorbing mechanical stress to balance the interface stress; At the same time, it can cooperate with the circumferential network lock structure composed of the lock ring 206 and the strip 207 to constrain the outer sheath 1 in two directions, and cooperate with the thermal conductive block 202 to quickly conduct heat out, further improve the heat dissipation effect, and realize multi-dimensional enhancement of the outer sheath 1 by the double support of the inner thermal conductive silicone grease and the clamping pad 220, making up for the defect of insufficient mechanical strength of polypropylene material.

[0023] Finally, it should be noted that the above only describes the preferred examples of the present application, and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the technical solutions described in the foregoing embodiments, or some of the technical features thereof can be replaced equivalently, without departing from the spirit and principle of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A 110kV high-voltage polypropylene power cable, comprising an outer sheath (1), characterized in that: The outer sheath (1) has a conductor (11) installed inside, and a cable core sleeve (12) is sleeved on the outside of the conductor (11). A shielding sleeve (13) is embedded in the outer wall of the cable core sleeve (12), and a composite compensation mechanism (20) is installed on the outside of the shielding sleeve (13). The composite compensation mechanism (20) includes an inner sleeve (201); An inner partition sleeve (201) is installed on the inner side of the outer sheath (1). Several heat-conducting blocks (202) are evenly installed on the outer wall of the inner partition sleeve (201). A binding sleeve (203) is sleeved on the outer side of the inner partition sleeve (201). The binding sleeve (203) is filled with a water-absorbing agent (205). A groove (204) is provided on the outer wall of the binding sleeve (203) at the position corresponding to the heat-conducting block (202). Several locking rings (206) are evenly embedded in the outer wall of the outer sheath (1). Several strips (207) are installed at equal angles along the circumferential direction on the side end face of the locking ring (206). The shielding sleeve (13) is uniformly and evenly installed with several ring frames (208) at equal intervals on the outer side. Several cable sleeves (209) are installed at equal angles along the circumferential direction on the side end face of the ring frame (208). Cable strips (210) are inserted inside the cable sleeves (209). Studs (211) are installed at the ends of the cable strips (210). End caps (212) are installed at the ends of the outer sheath (1). Slip rings (213) are slidably installed on the side end face of the end caps (212). Several compression springs (214) are installed at equal angles along the circumferential direction on one side end face of the slip rings (213). Nuts (215) are installed at the ends of the studs (211) by threads.

2. The 110kV high-voltage polypropylene power cable according to claim 1, characterized in that, The outer wall of the shielding sleeve (13) is fitted with a pad (216), and the middle of the inner wall of the ring frame (208) is fitted with a ring plate (217). The two end faces of the ring plate (217) are fitted with concave and convex ring strips (219). The outer wall of the pad (216) is provided with a ring groove (218) corresponding to the position of the ring plate (217). Several pads (220) are installed at equal angles along the circumference at the gap position of the ring frame (208) on the outer side of the cable (210). The inner wall of the pads (220) is symmetrically provided with grooves (221). An isolation ring (222) is installed on the outer curved edge of the ring frame (208). A sealing gasket (223) is installed on the inner wall of the end cap (212).

3. A 110kV high-voltage polypropylene power cable according to claim 1, characterized in that, The end cap (212) has a through hole (21) at the position corresponding to the cable (210) on its side end face. The slip ring (213) is connected to the end cap (212) through a compression spring (214). The end cap (212) is slidably connected to the stud (211), and the stud (211) has a semi-threaded structure on the outside. The stud (211) passes through the slip ring (213) and is slidably connected to the slip ring (213).

4. A 110kV high-voltage polypropylene power cable according to claim 1, characterized in that, The inner sleeve (201) is filled with liquid thermally conductive silicone grease at the gap position of the ring frame (208), the binding sleeve (203) is an elastic mesh structure, and the water absorbent (205) is a highly absorbent resin powder.

5. A 110kV high-voltage polypropylene power cable according to claim 2, characterized in that, The ring frame (208) is slidably connected to the pad (216). The ring plate (217) is connected to the end face of the groove (221) through the concave and convex ring strip (219). The concave and convex ring strip (219) is an elastic element. The concave and convex ring strip (219) is in the shape of annular waves. The inner wall of the pad (216) is evenly provided with several convex rings (22). The pad (216) and the convex rings (22) are sealed and fitted with the cable core sleeve (12). The pad (220) and the groove (221) are both arc-shaped. The groove (221) fits with the cable strip (210).

6. A 110kV high-voltage polypropylene power cable according to claim 1, characterized in that, The conductor (11) is made of annealed soft copper layers tightly pressed into a circular strand, and the outer sheath (1) is made of polypropylene nanocomposite material.

7. A 110kV high-voltage polypropylene power cable according to claim 1, characterized in that, An integrated connecting mechanism (30) is installed at the end of the end cap (212); The integrated connection mechanism (30) includes a base plate (301); A base plate (301) is mounted on one side of the end cap (212). A pressure tube (302) is embedded in the middle of the side end face of the base plate (301). A hollow ring (303) is mounted in the middle of the outer curved surface of the pressure tube (302). A protective sleeve (304) is mounted on the outer curved surface of the base plate (301). A heat shrink tubing (305) is mounted on the end face of the protective sleeve (304). A ring gasket (306) is symmetrically slidably mounted inside the hollow ring (303). 306) Several pull rods (307) are installed at equal angles along the circumferential direction on the side end face. Nuts (308) are installed at the ends of the pull rods (307). A screw hole (309) is opened at the end of the stud (211). The nut (308) and the stud (211) are connected by a pull rope (310). Both ends of the pull rope (310) are equipped with screw heads (311). Several through holes (312) are opened at equal angles along the circumferential direction on both ends of the hollow ring (303). An annular box (313) is installed at the end of the end cap (212). A sliding pad (314) is slidably installed inside the annular box (313). Several connecting rods (315) are rotatably installed on the side end face of the sliding pad (314) along the circumferential direction at equal angles. A connector (316) is installed at the end of the connecting rod (315). Several guide holes (324) are opened at equal angles along the circumferential direction on the end face of the annular box (313). Several connecting holes (317) are opened at equal angles along the circumferential direction on the outer curved edge of the substrate (301). The sleeve (304) is symmetrically and slidably installed with annular plugs (318). Several springs (319) are installed at equal angles along the circumferential direction on the side end face of the annular plugs (318). A rib (320) is provided inside the sleeve (304) between two annular plugs (318). Several guide holes (321) are opened at equal angles along the circumferential direction on the outer curved surface of the rib (320). A through hole (322) is opened on the side end face of the substrate (301) corresponding to the guide hole (321). A filling valve (323) is provided in the middle of the outer curved surface of the sleeve (304).

8. A 110kV high-voltage polypropylene power cable according to claim 7, characterized in that, The pull rod (307) is slidably connected to the hollow ring (303), the nut (308) and the screw opening (309) are both fitted with the screw head (311), and the nut (308) and the screw opening (309) are both connected to the screw head (311) by threads, and the pull rope (310) is an elastic strip.

9. A 110kV high-voltage polypropylene power cable according to claim 7, characterized in that, The connecting rod (315) is slidably connected to the ring box (313), and the connector (316) is connected to the connecting hole (317) by a thread, and the position of the connecting rod (315) is directly opposite to the position of the connecting hole (317).

10. A 110kV high-voltage polypropylene power cable according to claim 7, characterized in that, The gap between the two annular plugs (318) inside the sleeve (304) is connected to the through hole (322) through the guide hole (321). The through hole (322), the through port (312) and the guide port (324) are all connected to the outer space of the pressure pipe (302).

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