An insulating high-voltage resistant flame-retardant 10kV power cable

Abstract

The application discloses an insulating high-voltage-resistant flame-retardant 10kV power cable and relates to the technical field of power cables. A plurality of heat insulation protective sheets are arranged on the side end of the dense power transmission wire core, and an elastic protective sleeve is arranged on the outer side end of the heat insulation protective sheets. A plurality of storage heat fixation cavities are equidistantly arranged on the inner side of the elastic protective sleeve, and a plurality of armored outer protective sheets are equidistantly arranged on the outer side of the elastic protective sleeve. An outer clamping combined pipe is sleeved on the side end of the armored outer protective sheet. The internal sealing compression and oxygen absorption dehydration treatment are adopted to realize steady insulation of the wire core, reduce the internal short circuit or fire caused by the discharge of the wire core, and slow down the time when the cable becomes a combustible material during combustion through the cooperation of the double-layer active flame-retardant fire extinguishing and the double-layer passive flame-retardant. Therefore, the speed of flame spreading is slowed down, the time of fire extinguishing is prolonged, the direct loss of the cable during fire can be reduced, and the effect of flame-retardant and internal insulation flame-retardant protection is improved.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a flame-retardant 10kV power cable with high-voltage insulation. Background Technology

[0002] A cable is an electrical energy or signal transmission device, usually composed of several or several groups of conductors. Cables include power cables, control cables, compensating cables, shielded cables, high-temperature cables, etc. 10kV cables usually refer to medium-voltage power cables with a rated voltage of 10 kilovolts, or 10,000 volts, and are often used as the main power transmission lines from substations to large buildings, factories, and community power distribution rooms.

[0003] However, when cables are in use, there are gaps between the battery core and the insulation layer, which can easily lead to high-voltage discharge. In addition, the internal air contains water vapor and oxygen, which can cause short circuits or high-temperature fires to occur inside the cable during operation. Furthermore, there are no effective automatic fire extinguishing and flame-retardant components installed on the outside of the cable when a fire breaks out, which means that the outside of the cable becomes flammable material when it catches fire, accelerating the spread of the flames and shortening the time for firefighters to extinguish the fire, resulting in greater overall losses when a fire breaks out. Summary of the Invention

[0004] This invention provides a high-voltage resistant, flame-retardant 10kV power cable, which effectively solves the problems mentioned in the background art. These problems arise because the irregular shape of the cable core creates gaps between the core and insulation layer during power supply, making high-voltage discharge more likely. Furthermore, the presence of water vapor and oxygen in the internal air increases the risk of short circuits or high-temperature fires within the cable. Additionally, the lack of effective automatic fire extinguishing and flame-retardant components on the cable exterior allows it to become flammable, accelerating the spread of flames, reducing firefighting time, and increasing overall losses.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a flame-retardant 10kV power cable with high-voltage insulation, comprising dense transmission cores, wherein a multi-branching assembly is provided on the side end of the dense transmission cores, and an external resistance matching assembly is provided on the side end of the dense transmission cores.

[0006] The external resistance coupling assembly includes a heat-insulating protective sheet;

[0007] The dense transmission line core is provided with several heat insulation protective plates on its side end, and the outer end of the heat insulation protective plate is provided with an elastic protective sleeve, a material storage thermosetting cavity and an armored outer protective plate.

[0008] The outer armor plate is provided with an outer clamping combination tube, a multi-hole outer spray plate, an impact treatment hole and an outer insulating sleeve on its side end. At the same time, several heat-absorbing and material storage cavities are equally spaced on the side end of the outer clamping combination tube, and a centralized integration tube is installed on the outer side end of the multi-hole outer spray plate.

[0009] The inner side of the centralized integration tube is provided with a gas storage impact chamber, and a pressure-fixing membrane is installed on the side end of the impact treatment hole.

[0010] According to the above technical solution, the longitudinal section of the armored outer protective plate is arc-shaped, the inner diameter of the centralized integration tube is equal to the outer diameter of the outer clamp combination tube, and the outer diameter of the centralized integration tube is equal to the inner diameter of the outer insulating sleeve.

[0011] According to the above technical solution, a number of inner semiconducting sheets are laid at equal intervals on the outer side of the dense transmission line core, and the side ends of the multiple inner semiconducting sheets are provided with inner compression-resistant insulating sleeves and series extraction holes.

[0012] The outer end of the inner pressure-resistant insulating sleeve is equidistantly covered with several double-convex oxygen-absorbing flame-retardant sheets, and an oxygen-absorbing insulating strip is welded to one end of the double-convex oxygen-absorbing flame-retardant sheet at the position corresponding to the series extraction hole.

[0013] Multiple of the aforementioned biconvex oxygen-absorbing flame-retardant sheets are fitted with inner dehumidifying sleeves on their sides, and a number of outer semiconductive sheets are laid at equal intervals on the outer side of the inner dehumidifying sleeves.

[0014] A metal shielding strip is wound around the outer side of the outer semiconducting sheet, and a mid-limit blocking insulating sleeve is installed at the outer end of the metal shielding strip.

[0015] According to the above technical solution, the longitudinal section of the inner semiconductive sheet and the double-convex oxygen-absorbing flame-retardant sheet are both arc-shaped, the oxygen-absorbing insulating strip is inserted and installed inside the series extraction hole, and two adjacent double-convex oxygen-absorbing flame-retardant sheets are engaged with each other.

[0016] According to the above technical solution, the multi-part integrated assembly includes a hollow connecting tube;

[0017] The dense transmission line core is pressed with a hollow connecting tube on its side end, and the side end of the hollow connecting tube is symmetrically slidably connected with a pressure-clamping protrusion tube.

[0018] The hollow connecting tube and the side end of the press-fit convex tube are equidistantly bonded with several double-convex insulating blocks, and the outer end of the double-convex insulating blocks is wrapped with an insulating sheet.

[0019] A conical current-limiting sleeve is provided on the outer end of the insulating sheet, and an external insulating double-pass tube is fitted on the outer end of the conical current-limiting sleeve. An external support integrated block is provided on the side end of the external insulating double-pass tube.

[0020] The tapered current-limiting sleeve, the outer insulating double-pass pipe, and the outer support integrated block are all equipped with protective semi-conductive sheets on their side ends.

[0021] A threaded pressing block is installed on the inner side of the protective semiconducting sheet located at the position of the conical current limiting sleeve, and a pressing protrusion tube is installed on one end of the threaded pressing block by a combination bolt.

[0022] According to the above technical solution, a reinforcing threaded tube is installed on the inner side of the conical current limiting sleeve at the position corresponding to the isolation insulating sheet, and a double threaded tube is connected to the side end of the reinforcing threaded tube by a thread;

[0023] A heat-absorbing and storage cavity is provided on the inner side of the external support integrated block;

[0024] Cold shrink tubes are equidistantly installed on the side ends of the external support integrated block, and a clamping plate is installed on one end of the cold shrink tube;

[0025] The conical flow-limiting sleeve is bonded to a double-detachable fixing block on its side end, and the top of the side end of the external support integrated block is connected to an exhaust fixing pipe.

[0026] A downward pressure spring rod is snapped into the inner side of the exhaust fixing pipe, and an external spray limiting cover is installed at the top of the downward pressure spring rod;

[0027] A heat-insulating elastic block is installed between the two cold shrink tubes, and a protective adhesive sheet is glued to the side end of the arc-pressing plate;

[0028] One end of the double-detachable fixing block engages with the side end of the double-connected threaded pipe, and the side end of the outer insulating sleeve is attached to the side end of the arc-pressing plate.

[0029] According to the above technical solution, the longitudinal section of the press-fitted tube is T-shaped, the longitudinal section of the outer support integrated block is circular, and there are four protective semi-conductive sheets.

[0030] According to the above technical solution, the side end of the pressure-clamping convex tube is fitted and connected to the middle limiting blocking insulating sleeve, two adjacent double convex insulating blocks are engaged with each other, and there are two conical current limiting sleeves.

[0031] According to the above technical solution, the inner end of the protective semiconductive sheet and the threaded pressing block are both fitted with the outer end of the reinforcing threaded tube, and the side end of the pressing protrusion tube is slidably connected with the side end of the threaded pressing block.

[0032] According to the above technical solution, the inner side of the external spray limiting cover is fitted with the side end of the exhaust fixing pipe, and there are two heat insulation elastic blocks.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. It is equipped with an external resistance matching component. Through multi-layer full-wrap insulation combination, and with the cooperation of multi-segment electric field equalization components, the overall insulation effect is improved. The internal semiconducting sheet is sealed, and the external electric field is balanced with the external semiconducting sheet and metal shielding strip. With the help of double convex oxygen-absorbing flame-retardant sheet for deoxidation and drying treatment, the sharp point effect and unevenness of the conductor surface are eliminated, so that the electric field distribution is uniform, while reducing the internal oxidation rate and improving the stability and safety of the cell operation.

[0035] The sodium bicarbonate mixture inside the centralized integrated pipe and the external clamp combination pipe is decomposed by heat, and gradually sprayed outwards in conjunction with the porous external spray plate, gas storage impact chamber and impact treatment hole. The zinc borate in the armored outer protective plate, elastic protective sleeve and material storage thermosetting chamber absorbs heat to generate a glassy substance, which is then sprayed out through high pressure carbon dioxide to extinguish and retard the flame. The combustion products wrap the combustible surface to achieve external flame retardant treatment. Through external flame retardant and fire extinguishing treatment, combined with interface cooling treatment and layer-by-layer flame retardant isolation operation, internal fire is prevented. At the same time, in the event of an external fire, the speed of damage caused by the flame is slowed down, the time for workers to actively cut off the power is extended, and direct losses are reduced.

[0036] By combining internal cell homogenization treatment, cell drying and anti-oxidation treatment, and external heat absorption and active fire extinguishing and combustion to form a flame-retardant isolation zone, this technology effectively solves the problem of internal fire caused by uneven contact between the transmission line core and the insulation layer, leading to partial discharge and internal oxygen and water vapor aging. Through internal sealing and pressing and oxygen absorption and dehydration treatment, the cell is stably isolated, reducing the occurrence of internal short circuits or fires caused by cell discharge. Furthermore, by combining external double-layer active flame retardant fire extinguishing and double-layer passive flame retardant, the time it takes for the cable to become flammable during combustion is slowed down, thereby slowing the spread of flames and extending the time for fire suppression. This reduces direct cable damage during fires and improves the effectiveness of flame retardancy and internal insulation flame retardant protection.

[0037] 2. The system is equipped with multi-part integrated components. It uses an outer insulated double-through tube, an outer support integrated block, a press-fit convex tube, and a conical current-limiting and relay blocking insulating sleeve for assembly. This, along with a hollow connecting tube and a press-fit convex tube, combines two sets of densely packed transmission cores. Double-convex insulating blocks and insulating sheets seal the interfaces layer by layer. Reinforced threaded tubes, double-connected threaded tubes, and combined bolts then combine two sets of conical current-limiting sleeves and a conical current-limiting sleeve with a middle-limit blocking insulating sleeve. Cold-shrink tubing and a clamping arc-pressing plate combine the outer support integrated block with the outer insulating sleeve. Through internal press-fit connection, central bolt thread connection, and external quick-fit press-fit connection, the system achieves rapid overall assembly, reducing the impact of scattered parts on installation efficiency. The integrated prefabrication and quick-fit installation reduce unevenness at connection points caused by manual connections, which affects the uniformity of the electric field. This improves the uniformity and stability of the electric field distribution, reducing the occurrence of partial discharge at cable joints due to uneven interfaces and electric fields, thus accelerating cable aging and damage.

[0038] In summary, by combining the dual-separation components and the external resistance matching components, and through multi-segment insulation treatment from the inside out, multi-segment electric field equalization treatment, integrated interface combination, and electric field equalization treatment, the cable itself and the cable interface are steadily protected, thereby improving the insulation effect and operational stability of the cable. Attached Figure Description

[0039] 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.

[0040] In the attached diagram:

[0041] Figure 1 This is a schematic diagram of the planar structure of the present invention;

[0042] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0043] Figure 3 This is a schematic diagram of the installation structure of the dense transmission line core of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of the multi-unit interconnection component of the present invention;

[0045] Figure 5 This is a schematic diagram of the installation structure of the combined bolt of the present invention;

[0046] Figure 6 This is a schematic diagram of the installation structure of the press-fitted convex tube of the present invention;

[0047] Figure 7 This is a schematic diagram of the installation structure of the arc-pressing plate of the present invention;

[0048] Figure 8 This is a schematic diagram of the mounting structure of the internal semiconducting sheet of the present invention;

[0049] Figure 9 This is a schematic diagram of the installation structure of the intermediate-limit blocking insulating sleeve of the present invention;

[0050] Figure 10 This is a schematic diagram of the external resistance coupling assembly of the present invention;

[0051] Figure 11 This is a schematic diagram of the installation structure of the outer insulating sleeve of the present invention;

[0052] Numbered in the diagram: 1. Dense transmission line core;

[0053] 2. Multi-part integrated assembly; 201. Hollow connecting pipe; 202. Press-fit convex pipe; 203. Double-convex insulating block; 204. Isolating insulating sheet; 205. Conical current limiting sleeve; 206. Externally insulated double-through pipe; 207. External support integrated block; 208. Protective semi-conductive sheet; 209. Threaded pressing block; 210. Combination bolt; 211. Press-fit convex pipe; 212. Reinforced threaded pipe; 213. Double-connected threaded pipe; 214. Heat-absorbing storage cavity; 215. Cold shrink tube; 216. Arc-clamping fixing plate; 217. Double-detachable fixing block; 218. Exhaust fixing pipe; 219. Downward pressure spring rod; 220. External spray limiting cover; 221. Heat-insulating elastic block; 222. Protective adhesive sheet;

[0054] 3. External resistance coupling assembly; 301. Heat insulation protective sheet; 302. Elastic barrier sleeve; 303. Material storage thermosetting cavity; 304. Armored outer protective sheet; 305. External clamping combination tube; 306. Heat-absorbing material storage cavity; 307. Multi-hole external spray sheet; 308. Centralized integration tube; 309. Gas storage impact cavity; 310. Impact treatment hole; 311. Press-fit fixing film; 312. Outer protective insulating sleeve; 313. Inner semi-conductive sheet; 314. Inner compression-resistant insulating sleeve; 315. Series extraction hole; 316. Double-convex oxygen-absorbing flame-retardant sheet; 317. Oxygen-absorbing insulating strip; 318. Inner clamp dehumidifying sleeve; 319. Outer semi-conductive sheet; 320. Metal shielding strip; 321. Mid-limit blocking insulating sleeve. Detailed Implementation

[0055] 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.

[0056] Example: Figure 1-11 As shown, the present invention provides a technical solution: a flame-retardant 10kV power cable with high-voltage insulation, including a dense transmission core 1, and an external resistance coupling assembly 3 is provided on the side end of the dense transmission core 1.

[0057] The external resistance assembly 3 includes a heat insulation protective sheet 301, an elastic protective sleeve 302, a material storage thermosetting cavity 303, an armored outer protective sheet 304, an outer clamping combination tube 305, a heat-absorbing material storage cavity 306, a multi-hole outer spray sheet 307, a centralized integration tube 308, a gas storage impact cavity 309, an impact treatment hole 310, a pressure-pressing fixing film 311, an outer protective insulating sleeve 312, an inner semi-conductive sheet 313, an inner compression-resistant insulating sleeve 314, a series extraction hole 315, a double-convex oxygen-absorbing flame-retardant sheet 316, an oxygen-absorbing insulating strip 317, an inner clamping dehumidifying sleeve 318, an outer semi-conductive sheet 319, a metal shielding strip 320, and a middle-limit blocking insulating sleeve 321.

[0058] Several heat-insulating protective plates 301 are provided on one side of the dense transmission line core 1, and an elastic protective sleeve 302 is installed on the outer side of the heat-insulating protective plate 301.

[0059] The elastic protective sleeve 302 has several material storage thermosetting cavities 303 equidistantly opened on the inner side, and several armored outer protective plates 304 are equidistantly laid on the outer side of the elastic protective sleeve 302.

[0060] The outer armor plate 304 is sleeved with an outer clamping combination tube 305 on its side end. The longitudinal section of the outer armor plate 304 is arc-shaped. The inner diameter of the central integration tube 308 is equal to the outer diameter of the outer clamping combination tube 305, so as to achieve a stable clamping and protection treatment. Several heat-absorbing storage cavities 306 are equidistantly opened on the side end of the outer clamping combination tube 305.

[0061] A porous external spray nozzle 307 is bonded to the side end of the external comb tube 305, and a centralized integration tube 308 is installed on the outer end of the porous external spray nozzle 307.

[0062] A gas storage impact chamber 309 is provided on the inner side of the centralized integration pipe 308, and a number of impact treatment holes 310 are provided at equal intervals on the outer end of the centralized integration pipe 308. A pressure-punching fixing membrane 311 is installed on the side end of the impact treatment hole 310.

[0063] An outer insulating sleeve 312 is installed on the outside of the central integration tube 308. The outer diameter of the central integration tube 308 is equal to the inner diameter of the outer insulating sleeve 312 to ensure a tight fit.

[0064] A number of inner semiconducting sheets 313 are laid at equal intervals on the outer side of the dense transmission line core 1, and an inner compression-resistant insulating sleeve 314 is sleeved on the side end of the multiple inner semiconducting sheets 313.

[0065] The inner compression-resistant insulating sleeve 314 has several series extraction holes 315 equidistantly opened on its side end;

[0066] Several double-convex oxygen-absorbing flame-retardant sheets 316 are laid at equal intervals on the outer end of the inner pressure-resistant insulating sleeve 314. An oxygen-absorbing insulating strip 317 is welded to one end of the double-convex oxygen-absorbing flame-retardant sheet 316 at the position corresponding to the series extraction hole 315. The longitudinal section of the inner semi-conductive sheet 313 and the double-convex oxygen-absorbing flame-retardant sheet 316 are both arc-shaped. The oxygen-absorbing insulating strip 317 is inserted and installed inside the series extraction hole 315. Two adjacent double-convex oxygen-absorbing flame-retardant sheets 316 are interlocked to achieve side protection treatment and ensure the stability and tightness of the overall connection.

[0067] Multiple biconvex oxygen-absorbing flame-retardant sheets 316 are fitted with inner dehumidifying sleeves 318 on their sides, and several outer semiconducting sheets 319 are laid at equal intervals on the outer side of the inner dehumidifying sleeves 318.

[0068] A metal shielding strip 320 is wrapped around the outer side of the outer semiconducting sheet 319, and a middle-limiting blocking insulating sleeve 321 is installed on the outer end of the metal shielding strip 320.

[0069] A multi-unit interconnection assembly 2 is provided on the side end of the dense power transmission core 1;

[0070] The multi-part integrated assembly 2 includes a hollow connecting pipe 201, a press-fit convex pipe 202, a double-convex insulating block 203, an insulating isolating sheet 204, a conical current-limiting sleeve 205, an external insulating double-through pipe 206, an external support integrated block 207, a protective semi-conductive sheet 208, a threaded press-fit block 209, a combination bolt 210, a press-fit convex pipe 211, a reinforced threaded pipe 212, a double-connected threaded pipe 213, a heat-absorbing storage cavity 214, a cold shrink tube 215, a clamping arc pressing plate 216, a double-detaching fixing block 217, an exhaust fixing pipe 218, a downward pressing spring rod 219, an external spray limiting cover 220, a heat-insulating elastic block 221, and a protective adhesive sheet 222;

[0071] A hollow connecting tube 201 is pressed onto one side of the dense transmission line core 1, and a pressure-clamping protrusion tube 202 is symmetrically slidably connected to the side of the hollow connecting tube 201.

[0072] Several double-convex insulating blocks 203 are equidistantly bonded to the side ends of the hollow connecting pipe 201 and the pressure-clamping convex pipe 202. An insulating sheet 204 is wrapped around the outer end of the double-convex insulating block 203. The side end of the pressure-clamping convex pipe 202 is fitted and connected to the middle limiting blocking insulating sleeve 321. Two adjacent double-convex insulating blocks 203 are interlocked. There are two conical current limiting sleeves 205 to ensure the stability of current diversion and guidance.

[0073] A conical current-limiting sleeve 205 is provided on the outer end of the insulating sheet 204, an external insulating double tube 206 is fitted on the outer end of the conical current-limiting sleeve 205, and an external support integrated block 207 is provided on the side end of the external insulating double tube 206.

[0074] Protective semi-conductive sheets 208 are installed on the sides of the tapered current-limiting sleeve 205, the externally insulated double-pass tube 206, and the external support integrated block 207.

[0075] A threaded pressing block 209 is installed inside the protective semiconductive sheet 208 located at the position of the conical current limiting sleeve 205. One end of the threaded pressing block 209 is installed with a pressing protruding tube 211 by a combination bolt 210. The longitudinal section of the pressing protruding tube 211 is T-shaped. The longitudinal section of the outer support integrated block 207 is a ring. There are four protective semiconductive sheets 208 to achieve multi-segment snap-fit ​​protection.

[0076] A reinforcing threaded tube 212 is installed on the inner side of the tapered current limiting sleeve 205 at the position corresponding to the isolation insulating sheet 204. One end of the inner side of the protective semi-conductive sheet 208 and the threaded pressing block 209 are both fitted with the outer end of the reinforcing threaded tube 212. The side end of the pressing protrusion tube 211 is slidably connected to the side end of the threaded pressing block 209 to achieve multi-segment steady fit support and overall sealing connection. The side end of the reinforcing threaded tube 212 is connected to a double threaded tube 213 through a thread.

[0077] A heat-absorbing and storage cavity 214 is provided on the inner side of the external support integrated block 207;

[0078] Cold shrink tubing 215 is installed at equal intervals on the side end of the external support integrated block 207, and a clamping arc pressing plate 216 is installed on one end of the cold shrink tubing 215.

[0079] A double-detachable fixing block 217 is bonded to the side end of the conical current limiting sleeve 205. One end of the double-detachable fixing block 217 is engaged with the side end of the double-connected threaded pipe 213. The side end of the outer protective insulating sleeve 312 is attached to the side end of the arc-pressing plate 216 to achieve stable combination restriction. An exhaust fixing pipe 218 is connected through the top of the side end of the outer support integrated block 207.

[0080] A downward spring rod 219 is snapped into the inner side of the exhaust fixing pipe 218, and an external spray limiting cover 220 is installed at the top of the downward spring rod 219.

[0081] A heat-insulating elastic block 221 is installed between the two cold shrink tubes 215. The inner side of the external spray limiting cover 220 is fitted with the side end of the exhaust fixing pipe 218. There are two heat-insulating elastic blocks 221 to ensure the effect of internal limiting protection and the stability of limiting support. A protective adhesive sheet 222 is glued to the side end of the arc pressing plate 216.

[0082] The working principle and usage process of this invention are as follows: During cable laying, when it is necessary to connect two sets of cables, the workers use stripping tools to strip the cables layer by layer according to standards. When the dense transmission core 1 is stripped, the outer insulating double-through tube 221 and the outer support integrated block 222 are fitted onto the side end of one of the cables. Then, the two sets of crimping convex tubes 218 and the conical current-limiting sleeve 214 are fitted onto the side end of the relay blocking insulation sleeve 209. After the fitting is completed, the workers combine the hollow connecting tube 210 with the two dense transmission cores 1, and use a crimping device to crimp the hollow connecting tube 210 with the two dense transmission cores 1. After the initial assembly is completed, pull the crimping convex tube 211 to make the crimping convex tube 211 fit against the side end of the inner pressure-resistant insulating sleeve 202. At this time, use the crimping equipment to press and fit the crimping convex tube 211 and the inner pressure-resistant insulating sleeve 202 together, and reinforce the hollow connecting tube 210 to achieve the combination of the two dense transmission line cores 1. After the assembly is completed, the double convex insulating blocks 212 are glued to the side ends of the hollow connecting tube 210 and the crimping convex tube 211 one by one, and then the insulating sheet 213 is glued to the side ends of the double convex insulating blocks 212 to fill and seal the gaps of the double convex insulating blocks 212.

[0083] After the dense transmission line core 1 is initially connected and insulated, the conical current-limiting sleeve 214 is pulled, causing the reinforcing threaded tube 219 to move and the two sets of reinforcing threaded tubes 219 to be attached to each other. After attachment, the double-joint threaded tube 220 is screwed with a tool to combine with the reinforcing threaded tube 219, thereby limiting the two sets of conical current-limiting sleeves 214. After combination, the pressing convex tube 218 is pulled again to attach its inner end to the interface of the middle limiting blocking insulation sleeve 209. Then, the pressing convex tube 218 and the middle limiting blocking insulation sleeve 209 are pressed and fixed by the pressing equipment. The pressing convex tube 218 and the threaded pressing block 216 are fixedly connected with the combination bolt 217, realizing the connection between the conical current-limiting sleeve 214 and the middle limiting blocking insulation sleeve 209. The stable connection and restriction of the insulation sleeve 209: After the conical current limiting sleeve 214 is connected and fixed, the outer support integrated block 222 is pulled so that the side end of the outer insulation double tube 221 is attached to the side end of the two conical current limiting sleeves 214. After the attachment is completed, the cold shrink tube 224 is pulled to stably attach it to the side end of the outer sheath insulation sleeve 312, and the arc clamping plate 225 is attached to the side end of the outer sheath insulation sleeve 312. After the arc clamping plate 225 is attached, the two arc clamping plates 225 are fitted together and pressed and fixed using a pressing device. After the fixation is completed, the outer side of the arc clamping plate 225 is attached and protected and isolated by the protective adhesive sheet 318, so as to achieve stable combination protection for the cable joint. The integral connection component reduces the steps of the connection operation and improves the connection combination effect.

[0084] When the cable is in use, at the cable joint, a hollow connecting pipe 210 is used to steadily supply power to two sets of densely packed transmission wire cores 1. During the power supply process, the internal electric field is homogenized by four layers of protective semi-conductive sheets 215 from the inside out, reducing the occurrence of reduced insulation effect due to uneven electric field distribution at the joint. Double insulation treatment is carried out at the interface with double convex insulating blocks 212 and isolation insulating sheets 213. Electric field is insulated and controlled by tapered current limiting sleeves 214. Double-layer fixed insulation is carried out by external insulating double-through pipes 221 and external support integrated blocks 222. The multi-layer insulation combination improves the insulation effect and insulation capacity at the cable joint. By balancing the electric field, the occurrence of local breakdown at the cable joint is reduced, improving its operational stability and slowing down its aging rate. Dehydration and deoxidation treatment are carried out by iron oxygen absorber and desiccant filled in the double-detachment fixing block 313, reducing the occurrence of oxidation aging short circuits and fires caused by high humidity and oxygen, further improving its operational stability.

[0085] During cable operation, the inner semiconducting sheet 201 seals and fills the dense transmission core 1 and the inner compression-resistant insulating sleeve 202, eliminating the tip effect and unevenness of the conductor surface and ensuring a uniform electric field distribution. Simultaneously, the dense transmission core 1 is connected to the double-convex oxygen-absorbing flame-retardant sheet 204 via the series extraction hole 203. The iron-based oxygen absorber within the double-convex oxygen-absorbing flame-retardant sheet 204 and the oxygen-absorbing insulating strip 205 deoxidizes the area between the dense transmission core 1, the inner compression-resistant insulating sleeve 202, and the inner dehumidifying sleeve 206, in conjunction with the inner clamping... The desiccant inside the dehumidifying sleeve 206 is dehydrated to achieve internal drying and deoxidation. Then, the external semiconductive sheet 207 and the metal shielding strip 208 are used to guide the external electric field, further improving the uniformity of the electric field and reducing the occurrence of partial discharge. The intermediate-limit blocking insulation sleeve 209 is used for insulation treatment to improve the stability of cable operation. The cold shrink tubing 224 is used for isolation and protection of the side end, and the heat insulation elastic block 317 is used for heat insulation treatment of the side end, further improving the stability of the joint location environment and ensuring the stability of joint operation.

[0086] When a fire occurs in the external environment of the cable, after the flames burn and melt the outer sheath insulation sleeve 312, the heat of the flames is transferred to the location of the centralized integration tube 308 and the outer clamp combination tube 305. At this time, under the action of high temperature, the sodium bicarbonate mixture located in the outer clamp combination tube 305 is decomposed by heat, producing carbon dioxide. The carbon dioxide enters the gas storage impact chamber 309 of the centralized integration tube 308 through the porous outer spray nozzle 307. At this time, the heat and the gradually increasing gas pressure will squeeze the pressure-pressing fixing membrane 311 located at the impact treatment hole 310. When the heat melting state or the pressure critical point is reached, the pressure-pressing fixing membrane 311 breaks, and high-pressure carbon dioxide is ejected from the location of the gas storage impact chamber 309, which extinguishes and flame-retards the flames close to the cable, realizing automatic fire extinguishing and delaying the approach of the flames, realizing the cable self-rescue treatment in the event of a small-scale fire, thereby effectively reducing the loss of the cable.

[0087] When a large-scale fire occurs and the external outer casing 305 is burned, the armored outer protective sheet 304 provides heat insulation and blockage. This, combined with the elastic protective sleeve 302 and the zinc borate in the storage thermosetting cavity 303, absorbs heat. When the zinc borate in the storage thermosetting cavity 303 and the elastic protective sleeve 302 are burned, they gradually generate a glassy substance that wraps around the combustible surface, achieving heat insulation and flame retardant treatment. This, combined with the heat insulation protective sheet 301, provides internal heat insulation protection. By using three-stage flame retardant treatment, the speed at which the flames cause damage is reduced when an external fire occurs, extending the time for workers to actively cut off the power and reducing direct losses.

[0088] When overheating occurs at the cable joint, the heat is gradually conducted outward. When the heat is transferred to the heat-absorbing and storage cavity 223 of the outer support integrated block 222, the aluminum hydroxide mixture in the heat-absorbing and storage cavity 223 absorbs the heat. The aluminum hydroxide decomposes to produce water, which then absorbs heat to form water vapor. The water vapor accumulates and increases the air pressure in the heat-absorbing and storage cavity 223. At this time, the high pressure pushes the external spray limiting cover 316 to rise along the exhaust fixing pipe 314, and the water vapor is discharged from the inside of the heat-absorbing and storage cavity 223 along the exhaust fixing pipe 314, thus achieving internal cooling and temperature control. After the temperature control is completed, the spring structure of the lower spring rod 315 is reset, which drives the external spray limiting cover 316 to move down and engage with the side end of the exhaust fixing pipe 314, ensuring the stability of the overall isolation protection and isolation limitation.

[0089] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flame-retardant 10kV power cable with high-voltage insulation, comprising densely packed transmission cores (1), characterized in that: The dense power transmission core (1) is provided with a multi-splitting assembly (2) on its side end, and the dense power transmission core (1) is provided with an external resistance matching assembly (3) on its side end. The external resistance coupling assembly (3) includes a heat insulation protective sheet (301); The dense transmission core (1) is provided with several heat insulation protective plates (301) on its side end. The outer end of the heat insulation protective plate (301) is provided with an elastic protective sleeve (302), a material storage thermosetting cavity (303) and an armored outer protective plate (304). The armored outer protective plate (304) is provided with an outer clamping combination tube (305), a multi-hole outer spray plate (307), an impact treatment hole (310) and an outer protective insulating sleeve (312) on its side end. At the same time, a number of heat-absorbing storage cavities (306) are equally spaced on the side end of the outer clamping combination tube (305), and a centralized integration tube (308) is installed on the outer side end of the multi-hole outer spray plate (307). The central integration tube (308) has an air storage impact chamber (309) on its inner side, and a pressure-fixing membrane (311) is installed on the side end of the impact treatment hole (310). The dense power transmission core (1) is provided with several inner semiconducting sheets (313) laid at equal intervals on the outside. The inner semiconducting sheets (313) are provided with inner compression-resistant insulating sleeves (314) and series extraction holes (315) on their side ends. The inner pressure-resistant insulating sleeve (314) has several double-convex oxygen-absorbing flame-retardant sheets (316) laid at equal intervals on the outer end. One end of the double-convex oxygen-absorbing flame-retardant sheet (316) is welded with an oxygen-absorbing insulating strip (317) at the position corresponding to the series extraction hole (315). The sides of the multiple biconvex oxygen-absorbing flame-retardant sheets (316) are fitted with inner dehumidifying sleeves (318), and a number of outer semiconducting sheets (319) are laid at equal intervals on the outer side of the inner dehumidifying sleeves (318). The outer semiconducting sheet (319) is wrapped with a metal shielding strip (320), and a middle-limit blocking insulating sleeve (321) is installed on the outer end of the metal shielding strip (320).

2. The 10kV insulated, high-voltage resistant, flame-retardant power cable according to claim 1, characterized in that, The longitudinal section of the armored outer protective plate (304) is arc-shaped, the inner diameter of the central integration tube (308) is equal to the outer diameter of the outer clamp combination tube (305), and the outer diameter of the central integration tube (308) is equal to the inner diameter of the outer insulating sleeve (312).

3. The 10kV insulated, high-voltage resistant, flame-retardant power cable according to claim 1, characterized in that, The longitudinal sections of the inner semiconductive sheet (313) and the double-convex oxygen-absorbing flame-retardant sheet (316) are both arc-shaped. The oxygen-absorbing insulating strip (317) is inserted and installed inside the series extraction hole (315). The two adjacent double-convex oxygen-absorbing flame-retardant sheets (316) are engaged with each other.

4. A flame-retardant 10kV power cable with high-voltage insulation as described in claim 1, characterized in that, The multi-part integrated assembly (2) includes a hollow connecting pipe (201); The dense power transmission core (1) has a hollow connecting tube (201) pressed onto its side end, and the hollow connecting tube (201) has a symmetrical sliding connection with a pressure-clamping protrusion tube (202) on its side end. The hollow connecting tube (201) and the side end of the pressure-clamping tube (202) are equidistantly bonded with a number of double-convex insulating blocks (203), and the outer end of the double-convex insulating block (203) is wrapped with an insulating sheet (204). The outer end of the insulating sheet (204) is provided with a conical current limiting sleeve (205), the outer end of the conical current limiting sleeve (205) is fitted with an external insulating double tube (206), and the side end of the external insulating double tube (206) is provided with an external support integrated block (207). The conical current limiting sleeve (205), the outer insulating double tube (206), and the outer support integrated block (207) are all equipped with protective semi-conductive sheets (208) on their sides. A threaded pressing block (209) is installed on the inner side of the protective semiconductive sheet (208) located at the position of the conical current limiting sleeve (205). One end of the threaded pressing block (209) is fitted with a pressing protrusion tube (211) by a combination bolt (210).

5. A flame-retardant 10kV power cable with high-voltage insulation as described in claim 4, characterized in that, A reinforcing threaded tube (212) is installed on the inner side of the conical current limiting sleeve (205) at the position corresponding to the isolation insulating sheet (204), and a double threaded tube (213) is connected to the side end of the reinforcing threaded tube (212) by thread. The outer support integrated block (207) has a heat absorption and storage cavity (214) on its inner side; Cold shrink tubes (215) are installed at equal intervals on the side end of the external support integrated block (207), and a clamping arc pressing plate (216) is installed at one end of the cold shrink tube (215). The tapered flow limiting sleeve (205) has a double detachable fixing block (217) bonded to its side end, and the top of the side end of the external support integrated block (207) is connected to an exhaust fixing pipe (218). The exhaust fixing pipe (218) is fitted with a downward spring rod (219) inside, and an external spray limiting cover (220) is installed at the top of the downward spring rod (219). A heat-insulating elastic block (221) is installed between the two cold shrink tubes (215), and a protective adhesive sheet (222) is glued to the side end of the arc-pressing plate (216). One end of the double-detached fixing block (217) engages with the side end of the double-connected threaded pipe (213), and the side end of the outer protective insulating sleeve (312) is attached to the side end of the arc-pressing plate (216).

6. A flame-retardant 10kV power cable with high-voltage insulation as described in claim 5, characterized in that, The longitudinal section of the press-fitted tube (211) is T-shaped, the longitudinal section of the external support integrated block (207) is circular, and there are four protective semi-conductive sheets (208).

7. A flame-retardant 10kV power cable with high-voltage insulation as described in claim 5, characterized in that, The side end of the pressure-locking convex tube (202) is fitted and connected to the middle limiting blocking insulating sleeve (321), and two adjacent double convex insulating blocks (203) are engaged with each other. There are two conical current limiting sleeves (205).

8. A flame-retardant 10kV power cable with high-voltage insulation as described in claim 5, characterized in that, The inner end of the protective semiconductive sheet (208) and the threaded pressing block (209) are both fitted with the outer end of the reinforcing threaded tube (212), and the side end of the pressing protrusion tube (211) is slidably connected to the side end of the threaded pressing block (209).

9. A flame-retardant 10kV power cable with high-voltage insulation as described in claim 5, characterized in that, The inner side of the external spray limiting cover (220) is fitted with the side end of the exhaust fixing pipe (218), and there are two heat insulation elastic blocks (221).

Images