22 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.

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 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.

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.

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 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 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.

The invention discloses a cable current-carrying capacity real-time backstepping system and method based on optical fiber distributed sensing. The system comprises a light source module; an optical fiber distributed sensing unit; a data acquisition and preprocessing module; a physical model calculation module; a current-carrying capacity backstepping module; a safety evaluation and early warning module; and a visualization module. According to the invention, through the sensing optical fiber laid close to the cable, the Raman scattering effect is utilized to obtain the temperature distribution data of the whole cable in real time, after preprocessing, the data are input into a physical model calculation module to carry out current-carrying capacity estimation, boundary conditions are iteratively corrected, the maximum allowable current-carrying capacity is reversely deduced, and when the real-time current-carrying capacity exceeds a preset threshold value, three-level early warning response is triggered, so that the real-time early warning is realized. The temperature field, the current-carrying capacity curve and historical data are displayed in real time through the visual module, operation and maintenance decision making is assisted, the cable current-carrying capacity calculation precision and the overload prevention and control capacity under the complex working condition are remarkably improved, and an innovative solution is provided for power grid safe operation and power transmission efficiency optimization.

The application discloses a cable ampacity correction design method based on loop segmentation isolation and belongs to the technical field of building electrical power supply and distribution. In view of the problem that 0.7 ampacity correction coefficient must be used when the existing residential community distribution room outlet bridge is densely laid, leading to resource waste, the application divides the cable laying path into a front section and a rear section; the front section adopts a bridge or a cable trench to lay single-layer or multi-layer cables in a close arrangement; the rear section adopts a bridge to lay single-layer cables with a cable spacing of 3d, wherein d is the outer diameter of a single cable; a circuit breaker is arranged on the wall side of the distribution room, the front section cable is connected to the input end of the circuit breaker, and the rear section cable is connected to the output end of the circuit breaker; the rear section cable is selected according to the rated ampacity, and the ampacity correction coefficient is increased from 0.7 to 1.0. The application makes the rear section cable operate in a good heat dissipation condition through segmented and differentiated laying and loop isolation, exempts from the 0.7 coefficient, reduces the cable section by 1-2 grades, reduces the engineering cost by 20%-30%, and has strong engineering adaptability.

The polyrotaxane modified polyethylene sheath composite structure energy storage cable and the preparation method thereof, through the synergistic design of carbon fiber-copper composite conductor, nanofluid active heat dissipation, double-layer broadband shielding and polyrotaxane modified polyethylene sheath, the problems of poor heat dissipation, strong electromagnetic interference, easy aging and insufficient sheath performance of the traditional cable are solved. 6 The cable current carrying capacity is increased by 38.9%, the temperature rise is reduced by 60%, the bending life is greater than 5*10 6 Times, and is suitable for high requirement scenes such as new energy power station and electric vehicle fast charging.

The embodiment of the invention provides a cable test section temperature control method, device and equipment, a medium and a product. The method comprises the steps of obtaining physical parameters of a cable test section and thermal resistance parameters of a thermal insulation material, performing calculation in combination with a thermal resistance formula to obtain target size parameters, arranging a thermal insulation layer conforming to the target size outside the cable test section, and dynamically adjusting the size of the thermal insulation layer according to temperature distribution of the test section. Through the mode, the heat dissipation path of the cable test section is balanced, the fringe effect is eliminated, uniform temperature distribution is ensured, the accuracy and engineering applicability of the cable alternating current resistance test are remarkably improved, and a reliable basis is provided for cable current-carrying capacity evaluation.

The invention discloses a submarine cable data processing method and device, a storage medium and electronic equipment, and relates to the field of power transmission, and the method comprises the steps: obtaining a submarine cable project file; constructing an engineering simulation model of the submarine cable according to the submarine cable engineering file; constructing N armor layer equivalent models according to the engineering simulation model of the submarine cable; determining corresponding cable circulation distribution data of the submarine cable when each armor layer equivalent model is applied through simulation measurement and calculation; and determining a target armor layer equivalent model from the N armor layer equivalent models according to corresponding cable ring current distribution data when each armor layer equivalent model is applied to the submarine cable, and taking a matching condition of a galvanized steel wire and a copper wire of the target armor layer equivalent model as reference design information of the submarine cable. The technical problem that in the prior art, the submarine cable armor layer material ratio cannot be effectively optimized to reduce the circulating current loss and improve the cable current-carrying capacity is solved.

The invention relates to a power supply abnormity identification and self-adaptive scheduling method and system, and the method comprises the steps: obtaining a CAD power design drawing, constructing a power system topology model based on a graph database, constructing the power system topology model based on the graph database, and carrying out the power supply abnormity identification and self-adaptive scheduling. According to the method, multi-source sensor data, emergency lighting and image recognition signals are fused to carry out abnormal cross validation and accurate positioning, abnormal retrieval area determination and power supply abnormal recognition are realized, and on the basis of equipment real-time operation margin evaluation, cable current-carrying capacity, switch margin, electrical accessibility, space accessibility and space fire partition are taken as constraints, and power supply abnormal recognition is realized. And a self-adaptive scheduling strategy is generated through a multi-objective optimization function, so that rapid fault isolation, load loss minimization and power supply reliability maximization are realized.

The application discloses a cable ampacity test device and method capable of simulating high-temperature environment in the technical field of cable ampacity test, which comprises a bend pipe section, two straight pipe sections, two heat preservation end covers, and an upper heat preservation pipe and a lower heat preservation pipe and an insulation support. The two straight pipe sections are in sealed connection with the bend pipe section at one end, the two heat preservation end covers are in sealed connection with the other end of the straight pipe section and are provided with inlets and outlets matched with test cables, the bend pipe section and the straight pipe section each comprise the upper heat preservation pipe, the lower heat preservation pipe and the insulation support, the two sides of the upper heat preservation pipe are in sealed connection with the two sides of the lower heat preservation pipe and form a test cavity for accommodating the test cables, and the plurality of insulation supports are distributed along the axial direction of the test cavity and are used for radially supporting the test cables. The test cavity is formed by the connection of the plurality of upper heat preservation pipes and lower heat preservation pipes, the test cavity is heated to a test temperature by the self-heating of the test cables, the ampacity test of the test cables in the high-temperature environment is realized, and the application has the advantages of simple structure, convenient operation and green energy saving.

The application discloses a cable current-carrying capacity correction method and device based on dynamic thermal carrying capacity modulation, equipment and storage medium, relates to the power cable operation monitoring and current-carrying capacity evaluation technical field, and includes: obtaining voltage data, current data and conductor temperature data when the cable is running;Based on the operating power of the voltage data and the current data, the disturbance characteristic parameters are processed, and the disturbance characteristic parameter information is determined;Based on the power deviation, the power change rate and the power fluctuation standard deviation in the disturbance characteristic parameter information, the thermal carrying capacity coefficient information is determined;Based on the thermal carrying capacity coefficient and the conductor temperature data, the reference cable current-carrying capacity under the preset constraint condition is corrected, and the cable current-carrying capacity correction result is obtained.The application processes the disturbance characteristic parameters to solve the thermal carrying capacity coefficient, so that the current-carrying capacity can be dynamically corrected, and the adaptive adjustment of high disturbance derating and smooth recovery is realized.

This application relates to the field of photovoltaic system optimization design technology, and in particular to a photovoltaic array arrangement method, apparatus, and equipment based on medium-voltage direct-connected inverters. The method includes: determining the shadow range of the photovoltaic array at a preset time; calculating the lateral distance between the center points of adjacent photovoltaic strings in the row direction and the longitudinal distance between their center points in the column direction based on the shadow range, thereby generating an initial arrangement strategy for the photovoltaic array; iteratively optimizing the initial arrangement strategy to obtain the optimal arrangement strategy; and determining the optimal placement position of the medium-voltage direct-connected inverters in the optimal arrangement strategy based on the optimal arrangement constraints, so as to arrange the medium-voltage direct-connected inverters according to the optimal placement position. This solves the problems of high computational complexity in cable arrangement methods in related technologies, which cannot meet the arrangement requirements of medium-voltage direct-connected inverters, and do not integrate cable current carrying capacity and voltage drop verification, thus affecting the wiring length and specifications of DC cables.

The invention discloses a variable-diameter clamp for dynamically monitoring the current-carrying capacity of a cable, and aims to solve the problem that the outer diameters of cables with different specifications cannot be flexibly adapted according to actual field requirements at present. According to the variable-diameter hoop for dynamically monitoring the current-carrying capacity of the cable, a mounting base is arranged on a support, one end of a second hoop is located in a groove and hinged to the mounting base, one end of a first hoop is fixed to the mounting base, sliding grooves are formed in the first hoop and the second hoop correspondingly, one end of a protection pad is fixed to a vertical plate, and the other end of the protection pad is fixed to the vertical plate. The protective pad is arranged in the sliding groove of the first clamp and extends into the sliding groove in the second clamp, and locking assemblies are arranged on the top of the first clamp and the top of the second clamp. According to the invention, the cable is embedded into the matched hoop of the first hoop and the second hoop, and the second hoop is rotated to the closed position, so that stable clamping can be realized, and the cable clamping device is suitable for cables with different diameters and can flexibly adapt to diversified installation scene requirements in the fields of electric power, communication and the like.