46 results about "Cable ampacity" patented technology

The invention relates to the technical field of power system monitoring, and particularly discloses a cable current-carrying capacity dynamic evaluation and early warning system based on distributed sensing. The system comprises a distributed sensor network, edge computing nodes, a block chain privacy computing platform and a dynamic evaluation and early warning center. The sensing network collects multi-source physical parameters of the cable in real time; carrying out local preprocessing and feature extraction on the edge nodes; the privacy computing middle station cooperatively constructs and solves an electricity-heat-aging joint model and outputs a cable thermal state and an aging coefficient on the premise of not leaking special models and data of all parties through federated learning and a safe multi-party computing technology; and the early warning center calculates the dynamic current-carrying capacity, evaluates the health state and implements graded early warning. According to the invention, accurate and safe dynamic evaluation and intelligent early warning of the current-carrying capacity of the cable are realized.

The invention discloses a cable current-carrying capacity calculation method and device and a storage medium, and the method comprises the steps: constructing a steady-state thermal circuit model for a cable, the steady-state thermal circuit model structurally comprises a conductor, an insulating layer, a buffer layer, an aluminum sheath and an outer sheath, constructing an original thermal circuit control equation for each structure of the steady-state thermal circuit model, and constructing a dynamic characteristic curve representing linkage change between the thermal resistance value and the temperature value under each current for each structure of the steady-state thermal circuit model, correcting the original thermal circuit control equation according to the dynamic characteristic curve to obtain a target thermal circuit control equation, and solving the current-carrying capacity of the cable according to the target thermal circuit control equation. The heat conduction characteristics of the cable under different working conditions can be accurately described by constructing a steady-state thermal circuit model of the cable and carrying out detailed analysis on each structure of the cable. An original thermal circuit control equation is established for each structure, and a target thermal circuit control equation is obtained in combination with the dynamic characteristic curve, so that the current-carrying capacity of the cable can be calculated, and the accuracy of detecting the current-carrying capacity of the cable is improved.

The invention relates to the technical field of cable measurement, in particular to a cable group current-carrying capacity dynamic intelligent monitoring system based on multi-dimensional information, and the system comprises an acquisition unit which is used for acquiring cable parameters and environment parameters in a cable trench; the image unit is used for extracting the number of cracks of the cable insulation layer and the displacement distance of the cable; the electromagnetic thermal modeling unit is used for constructing an electromagnetic thermal coupling calculation model; the ventilation unit is used for performing single ventilation and continuous ventilation on the cable trench; the aging insulation unit is used for calculating a discharge generation value; the remote monitoring unit is used for constructing a cable monitoring model based on an electromagnetic thermal coupling calculation model, the special temperature of the cable and the discharge occurrence value so as to give an alarm for the abnormal condition of the cable; according to the invention, the above units cooperate with each other, so that the accuracy of the dynamic intelligent monitoring system for the current-carrying capacity of the cable group based on the multi-dimensional information is further improved while the current-carrying capacity of the cable is effectively analyzed.

The invention discloses a cable current-carrying capacity determination method and device, electronic equipment and a storage medium, and the method comprises the steps: dividing a target cable into n cable sections (n is an integer greater than 1), determining the temperature of each of the n cable sections to obtain n temperature values, determining the maximum temperature value of the n temperature values, and determining the current-carrying capacity of the target cable according to the maximum temperature value. The method comprises the following steps: acquiring a maximum temperature value of a target cable, determining the current-carrying capacity of the target cable based on the maximum temperature value to obtain a reference current-carrying capacity, determining a cable section corresponding to the maximum temperature value to obtain a target cable section, determining soil parameters corresponding to the target cable section, and finally adjusting the reference current-carrying capacity based on the soil parameters to obtain the target cable section. And obtaining the first target current-carrying capacity. By adopting the embodiment of the invention, the accuracy of determining the current-carrying capacity of the cable is improved.

The utility model discloses a liquid nitrogen cooling high-power medium-voltage cable, which relates to the cable field, and comprises a power transmission core, a cooling pipe and a heat conduction filling strip, the power transmission core, the cooling pipe and the heat conduction filling strip are twisted to form a cable core, a soaking wrapping layer is wrapped outside the cable core, a polypropylene wrapping layer is wrapped outside the soaking wrapping layer, and the polypropylene wrapping layer is wrapped outside the polypropylene wrapping layer. And a high-density polyethylene sheath is wrapped outside the polypropylene wrapping layer. The conductors in the cable are made of oxygen-free copper materials, the outer diameter is smaller under the condition of the same conductor cross section, the structure is compact, the conductivity is excellent, and the transmission calorific value is small; circulating cooling of liquid nitrogen is achieved by arranging the liquid nitrogen pipe, heat in high-power operation of the cable can be rapidly taken away, and the current-carrying capacity of the cable is greatly improved. The cooling pipe is formed by interlocking and armoring a liquid nitrogen pipe and nickel steel, the strength is high, and the reliability of liquid nitrogen circulation is achieved; the heat conduction filling strips are arranged in the gaps between the cooling pipes and the power transmission cores, and the soaking wrapping layer is wrapped outside the cable core, so that the heat in the cable can be effectively homogenized, and the cooling efficiency is improved.

The invention discloses a cable current-carrying capacity calculation method based on rapid inversion of a heat conductivity coefficient, and relates to the technical field of cables, and the method comprises the steps: S1, obtaining a cable operation state parameter, and carrying out the data preprocessing of the state parameter, and obtaining a target parameter; s2, establishing a cable environment inversion target function based on the target parameter and a medium heat conductivity coefficient; s3, calculating the cable environment inversion objective function based on a multivariate fusion function to obtain an inversion temperature value of the cable; s4, calculating the current-carrying capacity of the cable according to the inversion temperature value; the current-carrying capacity of the cable is calculated more accurately by quickly inverting the cable load environment parameters and the heat conductivity coefficient, the accuracy of the calculation result is improved, meanwhile, the problems that the calculation amount of inverse problem solving is large and calculation resources are occupied are solved by calculating the target function through the multivariate fusion function, the calculation efficiency of the cable temperature field is remarkably improved, and the calculation cost is reduced. Therefore, the rapid inversion of the cable environment parameters and the heat conductivity coefficient is realized, and the current-carrying capacity calculation efficiency is remarkably improved.

1. Name of the design product: assembled cable duct (increasing cable carrying capacity). 2. Use of the design product: used for providing safe and stable laying channel for power cable and protecting the cable. 3. Design points of the design product: in shape. 4. Picture or photo best indicating the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

The present invention relates to the field of cable production technology, specifically to a device and method for sheathing and molding special-shaped copper cores of flat flexible energy-saving cables, comprising a copper core extrusion molding device, a first sheathing machine, and a second sheathing machine, which are sequentially arranged along the conveying direction of a thin copper busbar; the prepared special-shaped copper core is a conductor with an arc-shaped special-shaped structure, and utilizes the skin effect. Compared with a traditional busbar of the same specification, the current carrying capacity is improved by about 10%, and compared with a cable with the same cross-sectional area, the current carrying capacity is increased by more than 15%, and an ultra-large current carrying capacity product with a current carrying capacity of up to 8000A can be produced, which significantly improves the power transmission efficiency and meets the needs of high-load power transmission; under the conditions of the same cross-sectional area and the same current carrying capacity, the conductor consumes about 8% less copper material than traditional busbars and cables during the production process, thereby reducing production costs and improving resource utilization efficiency; the bending radius is small during installation, and the conductor is easy to bend, which reduces the difficulty of installation.

The invention relates to a cable temperature rise analysis method based on cable current-carrying capacity, a medium and equipment. Comprises: establishing a geometric model of a cable according to a cable structure; arranging the geometric model according to a preset arrangement mode to construct a three-dimensional laying model, and simplifying the three-dimensional laying model into a two-dimensional laying model; the two-dimensional laying model is laid in soil in a simulated mode, boundary conditions are determined, and a thermodynamic model of the two-dimensional laying model is constructed; and analyzing the thermodynamic models under different current-carrying capacities by adopting a finite element method to obtain a relational expression between the current-carrying capacity and the temperature steady-state value of the cable core and a relational expression between the current-carrying capacity and the temperature steady-state value of the outer sheath. The thermodynamic models under different current-carrying capacities are analyzed by adopting a finite element method, the relationship between the temperature steady-state value of the cable and the load current is disclosed, the temperature steady-state value of the cable can be predicted according to the load current, and a scientific basis is provided for design and operation of the cable.

The invention relates to the field of cable thermal stability evaluation and dynamic capacity regulation and control, and particularly discloses a residual learning-based cable current-carrying capacity dynamic prediction method, which comprises the following steps of: acquiring multi-source cable data including global environment characteristics, local characteristics and physical model output, and preprocessing the multi-source cable data to obtain a pre-processed multi-source cable data; performing feature enhancement processing on the preprocessed multi-source cable data through an attention mechanism module; the attention mechanism module comprises a global attention mechanism module and a local attention mechanism module, inputting a result processed by the attention mechanism to the residual prediction model, obtaining a final temperature prediction value, calculating the maximum current-carrying capacity of the cable based on the temperature prediction value, determining the available range of the current-carrying capacity of the cable, and outputting the available range of the current-carrying capacity of the cable. And performing real-time updating and parameter correction on the residual prediction model based on the residual deviation. According to the method, the thermal circuit physical model and the residual learning algorithm are fused, and the method has high prediction accuracy and good dynamic response capability.

The invention provides a method for calculating the current-carrying capacity of a multi-loop cable in a ventilation tunnel based on a thermal circuit model. The method comprises the following steps of segmenting the cable of the ventilation tunnel, calculating the temperature of the cable of the mth segment, constructing equivalent external thermal resistance, obtaining expected current and obtaining the current-carrying capacity. Compared with the prior art, the method for calculating the current-carrying capacity of the multi-loop cable in the ventilation tunnel based on the thermal circuit model can be applied to actual engineering, and compared with finite element modeling calculation, the method is simpler and more suitable for engineering.

The invention discloses a cable current-carrying capacity prediction method and system, and a storage medium. The method comprises the steps of obtaining multi-dimensional data of a target cable; the multi-dimensional data comprises environmental thermodynamic parameters, cable structure parameters and laying topological parameters; pre-processing the multi-dimensional data of the target cable to obtain the pre-processed multi-dimensional data of the target cable; inputting the preprocessed multi-dimensional data of the target cable into the trained cable current-carrying capacity prediction model to obtain a prediction result of the current-carrying capacity of the target cable; according to the invention, on the premise of ensuring the precision, the calculation speed is obviously improved, and the millisecond-level rapid prediction of the cable current-carrying capacity is realized.

The utility model relates to the technical field of power equipment, and discloses an assembly type cable duct bank for increasing the current-carrying capacity of a cable, which comprises a plurality of cable duct bank units which are coupled and spliced, the center of the cross section of each cable duct bank unit is provided with a hollow heat dissipation hole, and a plurality of cable holes are uniformly distributed outside the heat dissipation hole; the tongue-and-groove side of the cable duct bank unit is provided with a horn mouth, and the other side of the cable duct bank unit penetrates into the horn mouth to be coupled and spliced; the top of the cable duct bank unit is provided with a hanging nail and a grounding steel plate. By adopting the hollow structure, the contact surface between the interior of the calandria and the air is increased, the heat dissipation is fast, and the current-carrying capacity of the cable is improved.

The invention discloses a high-voltage cable conductor temperature dynamic monitoring method and system, electronic equipment and a medium, and the method comprises the following steps: S1, pre-installing a temperature sensor in a high-voltage cable sheath layer, and collecting the temperature data of the sheath layer in real time through the temperature sensor; s2, performing RC thermal network equivalence on thermal resistance and thermal capacity of a conductor, an insulating layer and a sheath layer of the high-voltage cable, establishing a dynamic thermal network model of interlayer materials of the high-voltage cable, and constructing an incidence relation between cable core temperature and cable current-carrying capacity; s3, converting the constructed dynamic thermal network model into a high-voltage cable multi-layer heat conduction equation, and performing discretization solution on the equation by adopting a finite difference method to obtain radial distribution of the temperature of the high-voltage cable; according to the method, the sheath temperature real-time monitoring data and the dynamic thermal network model are utilized, the interlayer temperature distribution condition of the high-voltage cable can be represented, and the model is subjected to parameter correction, so that the cable temperature real-time monitoring accuracy is improved.

This invention discloses a method and system for calculating cable current-carrying capacity parameters. The method includes the following steps: S1: acquiring core cable parameters; S2: receiving input information of the core cable parameters through a mobile terminal's interactive interface; S3: performing calculations based on preset current-carrying capacity calculation logic and the core cable parameters; S4: outputting the cable current-carrying capacity calculation result, while simultaneously displaying auxiliary parameters related to the current-carrying capacity. The advantages of this method and system for calculating cable current-carrying capacity parameters are that it clarifies the core process and key parameters for cable current-carrying capacity calculation, enables convenient on-site calculations via a mobile terminal, covers the basic core requirements for current-carrying capacity calculation, and ensures the integrity of the current-carrying capacity calculation logic and ease of operation.

The application relates to the technical field of power cables, and discloses a type line conductor cross-linked polyethylene insulated medium-voltage power cable, which comprises a cable main body, the cable main body comprises a plurality of twistedly arranged conductors, each conductor is externally coated with a cross-linked polyethylene insulation layer, a fire-resistant mica layer is arranged between the outer part of each conductor and the cross-linked polyethylene insulation layer, and the cable main body further comprises a wrapping layer, a sheath structure, an air guide hose and an air guide assembly; the outer part of the plurality of conductors is provided with the wrapping layer, a filling layer is arranged between the inner part of the wrapping layer and the plurality of conductors, the sheath structure is arranged on the outer part of the wrapping layer, the inner part of the filling layer is provided with the plurality of air guide hoses, the air guide assembly is provided with two air guide assemblies, and the plurality of air guide hoses are located between the two air guide assemblies. Through the technical scheme, the problem that, in the prior art, due to dense arrangement of cables in a cable trench, heat dissipation of the cables is limited, thereby causing cable current-carrying capacity to decrease and affecting insulation life is solved.

This invention relates to the field of cable current carrying capacity technology, and particularly to a method, apparatus, and equipment for cooling tidal flat cables using seawater. The method includes: real-time monitoring of seawater level, water level in a storage tank, and the temperature of the tidal flat cable; performing pumping operations when the seawater level rises to a preset level, wherein the preset level is set based on the water level in the storage tank and a water level threshold in the tank; controlling the flow rate at the outlet of the storage tank to cool the tidal flat cable when the temperature of the tidal flat cable exceeds the preset temperature for a certain duration; adjusting the flow rate at the outlet of the storage tank according to the duration the temperature of the tidal flat cable exceeds the preset temperature, so that the flow rate adapts to the temperature of the tidal flat cable, avoiding waste of the seawater reserves in the storage tank and reducing energy consumption during subsequent pumping operations; this method not only ensures that the tidal flat cable is adequately cooled during tidal rise and fall, making the cable safe to operate and achieving maximum current carrying capacity, but also improves the utilization efficiency of the seawater in the storage tank and reduces the energy consumption of pumping operations.

The invention relates to the technical field of armored submarine cable lightweight design, in particular to a lightweight submarine cable current-carrying capacity comparison test method and system, and the method comprises the steps: selecting three single-core submarine cable prototypes of different structures as test objects, and setting the same conductor sectional area and length for the three prototypes; connecting the three submarine cable prototypes in series and arranging the submarine cable prototypes in a test site at a preset position, and acquiring test loop current and cable internal and external temperature change data by using a sensor; testing the three submarine cable prototypes in three schemes at the same time, adjusting the test current to enable the conductor temperature to reach a preset temperature threshold value, and recording and storing the test result; submarine cable temperature rise, heat dissipation performance and current-carrying capability evaluation is carried out on test results of the three submarine cable prototypes, and low-loss and lightweight design is carried out on the AC submarine cable according to a comprehensive evaluation result. According to the invention, the problem that there is no effective test method and evaluation means for verifying the current-carrying capacity performance of the lightweight armored cable in the prior art is solved.

According to the composite structure energy storage cable with the polyrotaxane modified polyethylene sheath and the preparation method of the composite structure energy storage cable, through the collaborative design of the carbon fiber-copper composite conductor, nanofluid active heat dissipation, double-layer broadband shielding and the polyrotaxane modified polyethylene sheath, the problems that a traditional cable is poor in heat dissipation, high in electromagnetic interference, prone to aging and insufficient in sheath performance are solved. The current-carrying capacity of the cable is improved by 38.9%, the temperature rise is reduced by 60%, the bending life is larger than 5 * 106 times, and the cable is suitable for high-requirement scenes such as new energy power stations and electric vehicle fast charging.

This invention discloses a method and system for dynamically optimizing cable current carrying capacity by combining duct layout parameters, relating to the field of cable heat conduction and heat dissipation technology. The method includes: constructing a dynamic identification module for a pre-managed duct area, based on a digital thermal path and a thermal-electric equivalent network; using a fiber optic temperature measurement array deployed within the pre-managed duct area to perform real-time temperature acquisition, driving the dynamic identification module embedded in the edge port to update the digital thermal path, and determining the dynamic safe current carrying capacity through optimization and inverse transformation under thermal-electric analogy conversion; and connecting the dynamic identification module to the power grid dispatching system to perform optimized allocation management based on the dynamic safe current carrying capacity. This invention solves the technical problems of fixed cable current carrying capacity in traditional duct layouts, which cannot adapt to dynamic environments and heat dissipation changes, achieving the technical effect of dynamically and accurately determining cable current carrying capacity in accordance with actual operating conditions, ensuring operational safety, and fully tapping the current carrying potential.

The present invention provides a method and device for arranging power cables based on optimal current carrying capacity, and relates to the technical field of current carrying capacity control of power cables, including: obtaining hole positions of power conduits and cable laying information; generating a hole position acquisition characterization sequence and the cable current carrying capacity under the characterization sequence based on the hole positions of the power conduits and the cable laying information, and obtaining the characterization sequence under the maximum cable current carrying capacity. The method and device provided by the present invention can determine the heat consumed by each cable and the influence of external factors on the cable current carrying capacity, determine the layout mode with the maximum total current carrying capacity of the cable, and improve the reliability of power grid operation.

The invention discloses a current-carrying capacity determination method and system for an overhead insulated cable, and a storage medium. The method comprises the steps: constructing a first expression of the current-carrying capacity of a wire according to the Joule heat of the wire, the absorbed heat of the sun, the radiant heat of the wire, and the convective heat dissipation; determining a second expression of the surface temperature of the insulating layer of the overhead insulated cable according to the first expression; carrying out derivation on the second expression by adopting MATHCAD, and obtaining a surface temperature Ts value of the insulating layer of the aerial insulated cable by adopting a Newton iteration method; and obtaining a current-carrying capacity value of the aerial insulated cable according to the surface temperature Ts value of the insulating layer.

The invention relates to the technical field of numerical simulation, in particular to an optimization system and optimization method for a cable current-carrying capacity calculation model, and the system comprises a test module which carries out an aging test; a monitoring module; the analysis module is used for establishing a relation model of running cable aging and an environment heat dissipation efficiency model according to the test data of the test module; wherein the analysis module is configured to determine an internal temperature variable quantity and a surface temperature variable quantity, input the internal temperature variable quantity and the surface temperature variable quantity into the relation model, determine the current thermal conductivity of an insulating layer of the operating cable, and correct a calculation model of the maximum current-carrying capacity of the operating cable by taking the current thermal conductivity as a correction parameter; according to the method, the relation model is established, and the relation among the surface temperature variable quantity, the internal temperature variable quantity, the boundary condition and the heat conductivity is represented, so that the influence of the aging degree on the calculation result is added in the calculation process of the maximum current-carrying capacity of the cable, and the calculation accuracy of the maximum current-carrying capacity is improved.

The invention relates to the technical field of power cables, and discloses a laying method and device for high-voltage parallel cables. The method comprises the steps of determining a construction form of a high-voltage parallel cable according to construction requirements; geophysical prospecting is performed on the high-voltage parallel cable according to the construction form, and a laying space of the high-voltage parallel cable is determined according to a geophysical prospecting result based on a three-dimensional technology; comparing the laying space with a preset specification requirement, and determining a laying mode of the high-voltage parallel cable; based on the laying mode and construction requirements, performing simulation processing on the high-voltage parallel cable to obtain cable current-carrying capacities of a plurality of sub-loops of the high-voltage parallel cable; judging whether the high-voltage parallel cable meets a preset unbalance degree requirement or not based on the cable current-carrying capacity of each sub-loop; and if not, correcting the laying mode by reducing the reactance of the parallel cable. According to the invention, high-voltage parallel cable construction is realized, parallel reactance is flexibly reduced, power transmission capacity is effectively increased, and power transmission efficiency and safety are improved.

The invention provides a temperature control method and system for a cable current-carrying capacity test. The scheme comprises the following steps: respectively establishing a simulation loop and a test loop of a to-be-tested cable; a cable preset position of the simulation loop is locally excavated, and the local excavation is to excavate a cable protection layer outside a cable conductor; according to a cable current-carrying capacity test requirement, setting a temperature sensor at a corresponding position of the local digging area, and integrally backfilling the digging area through the dug cable part; according to the temperature requirement of the test loop, the current size meeting the current temperature requirement is determined by adjusting the current size of the simulation loop and combining the temperature value obtained by the temperature sensor; and based on the obtained current magnitude, temperature control of the cable in the test loop is realized.

The invention discloses a buried cable group limit current-carrying capacity optimization method and device based on an analytical method. The buried cable group limit current-carrying capacity optimization method comprises the following steps that S1, related cable parameters are calculated according to structure parameters and laying environment parameters of all cables in a cable group; s2, constructing a buried cable group external correction thermal resistance calculation model, and calculating external correction thermal resistance according to cable positions; s3, constructing an equal-load cable group limit current-carrying capacity calculation model, and correcting the current-carrying capacity of a single cable to obtain the limit current-carrying capacity of the cable group under the equal-load condition; s4, constructing a buried cable group unequal load limit current-carrying capacity optimization model, and correcting the current-carrying capacity of each cable to obtain the optimized current-carrying capacity of each cable in the cable group; according to the invention, the transmission capability of the cable group and the utilization rate of the cable are improved, and the cable can be applied to cable groups with different burial depths, different intervals, different cable numbers and different arrangement modes.

The application provides a direct current cable current-carrying capacity dynamic evaluation method and device, and belongs to the field of cable operation detection. The method comprises the following steps: obtaining direct current cable structure parameters, electrical parameters, dynamic environment parameters and cable laying azimuth; based on the relative relationship among the solar elevation angle, the solar azimuth and the cable laying azimuth, calculating the sunlight radiation effective projection area and the absorbed heat flow density; selecting a correlation formula of forced convection heat transfer to calculate the forced convection heat transfer coefficient; using a segmented smooth transition function to calculate the actual convection heat transfer coefficient in the low wind speed interval; establishing a direct current cable heat balance equation, solving the direct current cable heat balance equation through the relaxation iteration method to obtain the maximum allowable current-carrying capacity; dynamically evaluating the ratio of the maximum allowable current-carrying capacity to the real-time load current, and outputting the dynamic evaluation result and the corresponding early warning information. Through the method, the application realizes dynamic evaluation of the current-carrying capacity, and fills the technical gap of the wind-sun coupling effect in the field of direct current cable dynamic capacity increase.

The utility model relates to a long-life liquid-cooling large-flow fast-charging high-voltage cable for a new energy automobile, and the cable comprises a plurality of power wire core units which are externally provided with neutral wire core units. A liquid cooling pipeline, a control wire core unit and an auxiliary wire core unit are arranged in an external gap between the neutral wire core unit and the power wire core unit, a filler is arranged outside the power wire core unit, the neutral wire core unit, the liquid cooling pipeline, the control wire core unit and the auxiliary wire core unit, and a sheath is arranged outside the filler. The cable is good in heat dissipation effect, the current-carrying capacity of the cable is greatly improved, and the service life of the cable is prolonged.

The invention provides a cable current-carrying capacity improving and fireproof material and a preparation method thereof, and relates to the technical field of cable cooling and fireproof materials, and the cable current-carrying capacity improving and fireproof material comprises the following components by weight: 20% of attapulgite, 42% of bentonite, 35% of fine quartz sand, 0.25% of sodium carbonate, 2.5% of cement, and 0.25% of citric acid. The water retention agent has excellent water retention performance: the bentonite and the attapulgite have high water absorbability and expansibility, and are matched with accurate water adding proportion and construction steps, so that the water retention agent fully expands in a cable buried pipe jacking pipe and a cable trench to form a compact water retention gel layer, and the water retention gel layer can be fully utilized with permeation of underground water and soil moisture; reliable cooling and resistance reduction protection is provided for the cable, so that the current-carrying capacity of the cable is improved, and the fireproof performance is good. A compact structure formed by the material can effectively block flame and heat transfer. When a fire disaster occurs, the expansion characteristic of the bentonite and the attapulgite can further form a heat insulation layer, fire spreading is delayed, and longer protection time is provided for cables and electric power facilities.

The invention relates to the technical field of power cables, and provides a molded line conductor cross-linked polyethylene insulated medium-voltage power cable, which comprises a cable main body, the cable main body comprises a plurality of conductors which are arranged in a stranded manner, and each conductor is coated with a cross-linked polyethylene insulating layer. A fire-resistant mica layer is arranged between the outside of each conductor and the cross-linked polyethylene insulating layer, the cable further comprises a wrapping layer, a sheath structure, an air guide hose and an air guide assembly, the wrapping layer is arranged outside the plurality of conductors, a filling layer is arranged between the inside of the wrapping layer and the plurality of conductors, the sheath structure is arranged outside the wrapping layer, and the air guide hose is arranged in the air guide assembly. The filling layer is arranged in the cable trench, a plurality of air guide hoses are twisted in the filling layer, the number of the air guide assemblies is two, and the plurality of air guide hoses are located between the two air guide assemblies, through the technical scheme, the problems that in the prior art, due to the fact that cables are densely arranged in the cable trench, heat dissipation of the cables is limited, the current-carrying capacity of the cables is reduced, and the insulation service life is affected are solved.