115 results about "Ampacity" patented technology

The invention discloses a wire temperature-current-carrying capacity coupling prediction method and system considering environmental factor correction, and belongs to the technical field of power transmission lines, and the method comprises the steps: obtaining the steady-state temperature, current-carrying capacity and environmental parameters of a wire, and carrying out the supplementation of missing values; establishing a current-carrying capacity-temperature polynomial equation based on the data after missing value supplementation; state judgment is carried out on the working condition of the wire according to the environment temperature change rate, and wire temperatures in different states are obtained through calculation; and inputting real-time environment parameters into a parameterized model obtained by fitting according to historical data, and jointly substituting into the current-carrying capacity-temperature polynomial equation in combination with the conductor temperatures in different states to obtain the current-carrying capacity. According to the method, the coefficient generation model can be finely adjusted to ensure that the model can adapt to physical characteristic changes caused by factors such as aging and pollution of the line, and long-term prediction precision is kept.

The invention relates to the technical field of electrical measurement, in particular to an intelligent cable management system and method for a high-voltage direct-current converter station, and the system comprises a data analysis module, a path evaluation module, a current shunting module, an anomaly detection module and a load mapping module. According to the method, on the basis of collecting node temperature, current and current-carrying capacity data, the heat capacity utilization rate and the redundancy rate are jointly calculated to improve the margin quantification precision, path endpoint deviations are dynamically compared based on the margin, path states are sorted in combination with the current-carrying capacity, and the problem of uneven heat capacity distribution is solved; a shunting instruction is generated according to a path current-carrying ratio and a redundancy rate to improve load balance, abnormal nodes are identified through sudden change of a temperature rise rate and a current change rate, loads are remapped in combination with the redundancy rate and the shunting instruction, thermal capacity evaluation, path sorting, shunting control and abnormal reconstruction closed-loop control are performed, and thermal safety management and response sensitivity are enhanced.

The invention relates to a submarine cable current-carrying capacity calculation method considering the cooperative influence of seawater thermophysical characteristics and ocean current and electronic equipment. The method comprises the following steps: calculating a heat conductivity coefficient of the seawater thermophysical characteristics on the basis of ocean current temperature; the average convective heat transfer coefficient of the submarine cable surface is calculated based on the seawater thermophysical property pair heat conductivity coefficient; based on the contact area between the seawater and the cable, the contact area between the seawater and the sediment, the temperature difference between the seawater layer and the outer surface of the cable, the temperature difference between the sediment layer and the outer surface of the submarine cable and the average convective heat transfer coefficient, calculating convective heat transfer power; calculating the area occupied by seawater in the heat transfer range of the submarine cable based on a preset heat transfer radius, and calculating a seawater heat transfer coefficient and a sediment heat transfer coefficient based on the area occupied by the seawater and the heat conductivity coefficient of the seawater thermophysical characteristics; calculating the resistance per unit length of the submarine cable conductor considering the conductor temperature; and calculating the submarine cable current-carrying capacity based on the convective heat transfer power, the submarine cable body heat transfer coefficient, the seawater heat transfer coefficient and the sediment heat transfer coefficient.

The invention discloses a conducting wire state evaluation method and device based on current-carrying capacity, terminal equipment and a storage medium, and belongs to the field of conducting wires, and the method comprises the steps: determining the conducting wire radiation heat dissipation power, conducting wire convection heat dissipation power and conducting wire sunlight heat absorption power of a target conducting wire according to an environment parameter, a physical attribute parameter and a real-time operation parameter; calculating the theoretical current-carrying capacity of the target wire according to the nominal alternating-current resistance value in the physical attribute parameters, the calculated convection heat dissipation power of the wire, the calculated radiation heat dissipation power of the wire and the calculated sunlight heat absorption power of the wire; and according to the theoretical current-carrying capacity, the load current, the wire convection heat dissipation power, the wire radiation heat dissipation power and the wire sunlight heat absorption power, calibrating the nominal alternating current resistance value to obtain a calibrated alternating current resistance value, and calculating the calibrated current-carrying capacity so as to evaluate the operation state of the target wire. According to the invention, the problem of inaccurate lead state evaluation in the prior art can be solved.

The application relates to the technical field of electrical connection equipment, and discloses a high-current small bus plug-in box rotary plug, which is used to solve the problems that the structure of key conductive components is single, the setting space is cramped, the conductive temperature rises fast, and the components are prone to aging in the prior art. The application is characterized in that the space of the regular octagonal flame-retardant PC shell and the insulating partition plate is optimized, the T2 oxygen-free copper Z-shaped large-section pin array is symmetrically arranged, the uniform contact pressure guaranteed by the spring assembly is matched, the conductive cross-sectional area is 2-3 times higher than that of the traditional reed structure, the galvanic corrosion of dissimilar metals is effectively avoided, the current-carrying capacity and the current transmission stability are greatly improved, the multidirectional heat exchange channels formed by the regular octagonal included angle, the pin array bending gap and the internal cavity are combined, the separation and heat dissipation of the insulating partition plate are combined, the cold and hot air efficient convection is realized, and the temperature rise of the key components is significantly reduced.

The utility model discloses a kind of wiring fixed frame and eVTOL aircraft, wiring fixed frame includes: first assembly block, second assembly block and base;Multiple first round grooves and multiple second round grooves are provided on base, multiple third round grooves are formed with recess on the side of first assembly block close to base, multiple fourth round grooves are formed with recess on the side of second assembly block close to base;Any first round groove and corresponding third round groove cooperate to form first wire arrangement hole, any second round groove and corresponding fourth round groove cooperate to form second wire arrangement hole;Fifth round groove is provided on the side of first assembly block, sixth round groove is provided on the side of second assembly block, fifth round groove and sixth round groove cooperate to form fixed hole.The utility model is arranged with multiple wire arrangement holes and fixed holes, wire rod is arranged according to preset path and position, increase the spacing between wire rod, reduce signal interference caused by electromagnetic induction, reduce the thermal aggregation effect temperature rise of bundled cable too high to cause ampacity reduction, ensure the accuracy of signal transmission.

The application discloses a kind of considering electric-thermal coupling feedback's DC cable parallel operation evaluation method and system, it is related to high voltage direct current transmission technical field, to solve the problems such as the distortion of current distribution calculation, the large deviation of temperature prediction, the low utilization rate of carrying capacity of existing technology in DC cable parallel, it includes obtaining the multi-source heterogeneous data of each parallel DC cable;Build DC resistance-temperature dynamic model, cable temperature distribution model based on equivalent thermal circuit method and the circuit constraint equation group of parallel DC cable system into electric-thermal coupling nonlinear equation group;Using improved Newton-Raphson method algorithm iteration solves electric-thermal coupling nonlinear equation group to obtain the conductor temperature of each DC cable, and according to its parallel operation state is evaluated to obtain evaluation result.The application can realize the accurate coupling calculation of parallel DC cable current distribution and temperature distribution, provide scientific basis for the design, operation and maintenance and expansion reconstruction of extra-high voltage direct current transmission project.

The invention belongs to the technical field of power distribution networks, and particularly relates to a cable accessory and a design and preparation method thereof. The cable accessory comprises an insulating hollow tubular part and a stress pipe, the stress pipe is arranged at at least one end part of the insulating hollow tubular part, and the stress pipe is a dielectric stress pipe; the dielectric constant stress pipe is formed by applying an auxiliary electric field to the insulating liquid silicone rubber mixture injected outside the insulating hollow tubular part for a preset period of time and then carrying out orientation arrangement. The diameter of a cable accessory can be effectively reduced through the dielectric constant stress control pipe, heat dissipation and the maximum current-carrying capacity are enhanced, meanwhile, the device is suitable for special scenes with narrow spaces, and the electric field control effect is improved.

The embodiment of the present application provides a kind of method, device and processor for determining the carrying capacity of damaged conductor, belong to transmission line field.The method for determining the carrying capacity of damaged conductor includes: by the method of finite element, node division is carried out to damaged conductor, to obtain the multiple nodes corresponding to damaged conductor;Obtain the node related information and node environment information corresponding to each node, wherein, node related information includes node temperature, node environment information includes the sunshine radiation intensity, wind speed, wind direction angle and environmental temperature corresponding to node;Current is injected to damaged conductor, and according to node related information and node environment information, the node steady state temperature corresponding to each node when reaching thermal equilibrium condition is determined;According to node steady state temperature and preset conductor temperature threshold, the injection current of damaged conductor is adjusted, to obtain the maximum bearing current corresponding to damaged conductor.The technical scheme of the embodiment of the present application can determine the carrying capacity of damaged conductor.

The invention discloses a transmission conductor current-carrying capacity testing device, which comprises an experimental area, a to-be-tested conductor arranged in the experimental area and an illumination part, and is characterized in that the illumination part simulates solar irradiation at different time by adjusting the illumination angle irradiated on the to-be-tested conductor; the to-be-tested wire is connected in series with the current applying module, current with adjustable amplitude is applied to the to-be-tested wire through the current applying module, so that the current-carrying heating state of the wire in actual operation is simulated, and the adjustable current applying module is dynamically coupled with the adjustable illumination component, so that the current-carrying heating state of the wire in actual operation is simulated. Thermal load environments under different solar irradiation intensities and angles can be accurately reproduced; meanwhile, a contact type temperature sensor and a non-contact type infrared spectrum detection module are combined, and finally, one-button type coordination control and safety intervention are carried out on parameters such as current, illumination, temperature and humidity through a centralized control platform, so that the real operation state of the wire is restored with high precision under the laboratory condition; and a reliable data basis is provided for power transmission line current-carrying capacity evaluation.

The utility model relates to the technical field of cables, in particular to a feed cable for a maglev train, which comprises a conductor. The outer wall of the conductor is coated with the semi-conductive wrapping layer; the insulating layer is extruded on the outer wall of the semi-conductive wrapping layer; the semi-conductive shielding layer is coated on the outer wall of the insulating layer; and the braided shielding layer is coated on the outer wall of the semi-conductive shielding layer. According to the utility model, the inner layer of the conductor is a circular stranded conductor, the outer layer is a fan-shaped stranded conductor, impedance rise caused by skin effect can be reduced, the insulating layer is a double-layer insulating layer, the inner layer adopts a high-density polyethylene structure, and the outer layer adopts a gradient foaming structure, so that the skin depth of high-frequency current can be effectively reduced, and the service life of the cable is prolonged. In addition, the low dielectric constant foaming layer also reduces the eddy current loss of the shielding layer, the overall thermal stability of the cable is improved, and higher current-carrying capacity can be realized.

The invention discloses a high-voltage cable current-carrying capability optimization method and system in a complex construction environment, and relates to the technical field of current-carrying optimization, and the method comprises the following steps: collecting first data along a cable to be laid; based on the first data, performing local thermal resistance calculation and temperature rise simulation on each section of the cable, generating an along-line space-thermal coupling map, and identifying paragraphs with local overheating risks; according to the identified overheating risk segment, dividing the cable along the line into a plurality of variable current-carrying intervals, and generating the maximum allowable current-carrying capacity; based on the variable current-carrying interval and the maximum allowable current-carrying capacity thereof, designing and optimizing a laying scheme; in the cable operation process, temperature and environment sensors are arranged based on the optimized laying scheme, local temperature rise is monitored in real time, and the operation current-carrying capacity of each interval is dynamically adjusted according to the monitoring result. According to the method, the variable current-carrying interval is divided by analyzing the spatial constraint and thermal characteristics along the cable, so that the problem that the current-carrying capacity is difficult to accurately evaluate in a complex environment is solved.

The invention belongs to the technical field of electrical connection, relates to a converter cabinet, and discloses a laminated copper bar lap joint unit and lap joint structure of the converter cabinet, and the laminated copper bar lap joint unit comprises three laminated copper bars which are in lap joint with one another, namely a laminated copper bar A, a laminated copper bar B and a laminated copper bar C; one end of the laminated copper bar A is connected with an electric energy conversion unit of the traction converter, the other end of the laminated copper bar A is in lap joint with the laminated copper bar B through a bolt, and the laminated copper bar B is in lap joint with the laminated copper bar C through a bolt; the laminated copper bar B and the laminated copper bar C are provided with insulating plates used for keeping an electrical gap. The laminated copper bar is adopted, a new lap joint unit is designed through an innovative lap joint mode, and the problem that the conductivity of the copper bar is affected by the proximity effect is effectively solved; meanwhile, the laminated copper bars have the characteristic of low stray inductance, so that the peak voltage of the switching device can be effectively suppressed, the current distribution is more uniform, the current-carrying capacity is improved, and the local temperature rise of the device is prevented from being too high.

The invention discloses an overhead conductor environmental factor-current-carrying capacity calculation method based on GB, IEEE and CIGRE model unification. The current-carrying capacity calculation method comprises the following steps: acquiring environmental parameters; performing unified judgment on convection working conditions around the wire according to the environmental parameters to obtain a working condition judgment result; performing parallel calculation on convective heat dissipation under three standards of GB, IEEE and CIGRE according to the working condition judgment result, and unifying the convective heat dissipation according to a unification principle to obtain unified convective heat dissipation; calculating radiation heat dissipation, sunlight heat absorption and effective alternating current resistance of the overhead conductor; and solving the current-carrying capacity by using the unified convection heat dissipation, the radiation heat dissipation, the sunlight heat absorption and the effective alternating current resistance. On the basis, a unified multi-standard current-carrying capacity calculation mode is realized, the prediction accuracy is improved, and the line current-carrying potential is released.

The invention relates to a simulation method and system for size and cost optimization of a copper-clad aluminum busbar composite material. The method comprises the following steps: establishing a simulation model of the copper-clad aluminum busbar composite material; establishing a plurality of simulated copper-clad aluminum busbars based on different section sizes and different copper layer proportions in the simulation model; setting physical field parameters and environmental parameters of a plurality of simulated copper-clad aluminum busbars in the simulation model, executing simulation operation, generating current-carrying capacities of different simulated copper-clad aluminum busbars under different temperature rises, and storing the current-carrying capacities in a database of the simulation model; obtaining a target current-carrying capacity and a target temperature rise input by a user, and matching all candidate copper-clad aluminum busbars meeting a current-carrying capacity requirement; and calculating the manufacturing cost of each candidate copper-clad aluminum bar according to the price data of the pure copper and pure aluminum materials obtained in real time, and taking the specification data corresponding to the candidate copper-clad aluminum bar with the lowest cost as an output result. Through combination of a systematic simulation database and an intelligent cost optimization algorithm, automatic mapping from performance requirements to economic optimal design is realized.

The invention discloses a conductor current-carrying capacity-sag coupling modeling method and system based on electro-thermal-mechanical coupling, and belongs to the technical field of transmission conductors. A thermal balance equation is established based on obtained Joule thermal power, sunlight heat absorption power, convection heat dissipation power and radiation heat dissipation power; solving the heat balance equation to obtain the surface temperature of the wire; taking the surface temperature of the wire as a boundary condition, constructing a concentric multilayer radial heat conduction model, and solving to obtain a radial temperature gradient of the wire; calculating strain of various materials in the wire based on the radial temperature gradient of the wire, and obtaining real horizontal stress through adaptive iteration; and substituting the real horizontal stress and the obtained geometric parameters of the conductor into the parabola model to obtain the maximum sag of the conductor under the current working condition. According to the method, the lead temperature evaluation precision is improved, systematic deviation caused by conductor isothermal or neglecting of irradiation / wind-induced heat exchange is avoided, and a reliable thermal boundary is provided for dynamic current-carrying capacity evaluation.

The invention discloses a composite enhanced high-thermal-conductivity cable, and the cable comprises a conductor layer which is composed of a metal-based composite conductor material; the insulating layer is coated outside the conductor layer and is made of a high-thermal-conductivity insulating composite material; the shielding reinforcing layer is coated outside the insulating layer and is formed by weaving a fiber-conductive composite material; and the sheath layer is coated at the outermost part. A three-dimensional heat dissipation channel from inside to outside is constructed through the graphene composite conductor and the boron nitride composite insulating layer, efficient cooperative heat dissipation is achieved, compared with a traditional cable, the high heat conduction effect is achieved, the current-carrying capacity is remarkably improved, and insulation aging is delayed; meanwhile, the shielding enhancement layer enables the cable to have the characteristics of high tensile strength and bending fatigue resistance while keeping light weight; and the heat insulation buffer layer is matched with the sheath layer, so that the cable is endowed with excellent environmental adaptability, and the technical contradiction that multiple properties such as high conductivity and high heat conductivity, high strength and light weight are difficult to consider at the same time is systematically solved.

The invention discloses a liquid-cooled high-current-carrying-capacity medium-voltage power cable, and relates to the technical field of medium-voltage power cables, the liquid-cooled high-current-carrying-capacity medium-voltage power cable comprises a central conductor, the outer side of the central conductor is provided with an inner insulating layer, the outer side of the plurality of inner insulating layers is coated with an inner bundling layer, and the outer side of the inner bundling layer is provided with a driving installation end box. A top mounting plate is connected to the top end of the driving mounting end box, a heat dissipation liquid guide pipe is laid on the outer side of the internal binding layer, and the outer side of the heat dissipation liquid guide pipe is coated with a silica gel heat conduction sleeve. Heat in the cable is rapidly taken away from the interior of the cable through directional discharge of hot air flow, rapid heat dissipation of the interior of the cable is achieved, and the heat dissipation efficiency of the cable is improved. The cable is ensured to be continuously kept in a proper temperature range in a long-time high-load operation process, the phenomenon of temperature rise and resistance rise after the cable is used for a long time is effectively prevented, and the heat dissipation efficiency and the use stability of the cable are further effectively improved.

The application discloses a light overhead line for high altitude, which comprises a conductor made of high-conductivity aluminum alloy, and the cross section of the conductor is low-speed airfoil shape. The application breaks the inherent traditional thinking, optimizes the material of the conductor to reduce the self weight, and innovatively optimizes the cross section of the conventional conductor from a circle to a low-speed airfoil shape. In combination with the existing high-conductivity aluminum alloy material, when the conductor is used overhead, the Bernoulli effect is utilized to generate lift to offset part of the self weight of the overhead line, so that the safety of the line is enhanced. Meanwhile, the cross section structure of the low-speed airfoil shape increases the surface area of the conductor, which is more conducive to heat dissipation of the conductor, so that the current-carrying capacity of the line is increased, and the power loss of the long-distance power transmission line is reduced.

The utility model discloses an IGBT (Insulated Gate Bipolar Translator) wiring bridge mounting structure. The IGBT lap bridge installation structure comprises an IGBT module, a laminated positive busbar, a laminated negative busbar and a conducting bar, the IGBT module is provided with a positive pin and a negative pin, the laminated negative busbar is located below the laminated positive busbar and distributed in a staggered mode, the laminated negative busbar is connected to the negative pin, the conducting bar is arranged on the left side of the laminated positive busbar, one end of the conducting bar is connected to the laminated positive busbar, and the other end of the conducting bar is connected to the laminated negative busbar. And the other end is connected to the positive pin and the laminated positive busbar. According to the utility model, more uniform current distribution can be realized through the shunting effect of the conducting bar, and the conducting bar is used as an additional current channel, so that the current pressure borne by a single pin is effectively reduced, and the current sharing effect among the pins is remarkably improved; in addition, the conducting bar increases the current-carrying capacity of a narrow pin area and provides an extra heat dissipation area, so that the heat dissipation efficiency is improved.

The utility model provides a laminated conducting bar, which relates to the technical field of power electronics, and comprises an anode laminated conducting bar and a cathode laminated conducting bar, one side of the anode laminated conducting bar is provided with an I-GBT pin anode conducting bar, one side of the cathode laminated conducting bar is provided with an I-GBT pin cathode conducting bar, and the other side of the anode laminated conducting bar is provided with an I-GBT pin anode conducting bar and an I-GBT pin cathode conducting bar. The positive electrode laminated conducting bar and the negative electrode laminated conducting bar are arranged in a laminated manner, and the structure is characterized in that the I-GBT pin positive electrode conducting bar and the I-GBT pin negative electrode conducting bar are also arranged in a laminated manner. The laminated conducting bar provided by the utility model has remarkable beneficial effects in the aspects of improving current-carrying capacity, reducing heat, reducing parasitic inductance, reducing cost, improving flexibility and adaptability and the like, and provides powerful support for the development of the modern power electronic technology.

The utility model relates to the technical field of high-voltage power distribution, in particular to a wiring cable connection structure of a pole-mounted vacuum circuit breaker, which comprises a wiring cable consisting of a wire core and a cladding, the wire core at one end of the wiring cable is crimped in a binding post of the pole-mounted vacuum circuit breaker, and a laser welding layer is arranged at the crimping position. A wire core at the other end of the wiring cable is fixedly connected with a wire nose, and a plurality of sealing layers are arranged at the joint. According to the utility model, through first crimping and then laser welding, the loop resistance on the binding post is smaller, the current-carrying capacity is improved, the temperature rise change is reduced, and the connection is stable and reliable; and meanwhile, the wire nose and the binding post both adopt a multi-layer sealing layer structure, so that the waterproof and protection effects of the wiring cable can be greatly improved, line faults caused by the problems of moisture, heating due to poor contact, chemical reaction corrosion and the like in copper-aluminum lap joint in an outdoor environment are solved, and the long-term stable operation of the pole-mounted vacuum circuit breaker is ensured.

The invention relates to a large-current cable wiring terminal assembly manufacturing process, and the process comprises the following steps: S1, stripping the end part of a cable, and exposing a plurality of strands of conductor wire harnesses; s2, filling the low-melting-point alloy into a conductor wire harness gap in one of two modes: in the first mode, firstly filling the alloy, cooling and curing to form a filling body, and then sleeving and crimping a wire nose; in the second mode, the wiring nose is firstly sleeved and pressed, and then the alloy is filled; s3, after the alloy is cooled and solidified, filling bodies are formed in the gaps; s4, an exclusive step of the mode I: sleeving the wire nose on the end part of the conductor wire harness, and enabling the cylindrical part of the wire nose to cover the filling body and partially unfilled conductor wire harness; and S5, crimping the wire noses in the first mode, and crimping the wire noses before filling the alloy in the second mode. Thus, gaps between conductor monofilaments are effectively eliminated, contact resistance is reduced, the current-carrying capacity is greatly improved, heat generated in the electrifying process is reduced, and effective control over temperature rise of the wiring terminal assembly is finally achieved.

The invention relates to a sub-element (1) for producing a semi-finished wire (34) of an Nb3Sn superconducting wire (32), said sub-element (1) comprising:-a Sn-containing core region (2); a Cu-containing inner matrix region (3) surrounding the Sn-containing core region (2); -a bundle region (4) comprising a plurality of Nb-containing rod elements (5) lying against one another, the bundle region (4) surrounding the inner matrix region (3); an intermediate region (6) surrounding the bundle region (4); the invention relates to a Cu-containing rod element (5), comprising an intermediate region (6), a circumferential diffusion barrier (9), which surrounds the intermediate region (6), and a Cu-containing sheath region (10), which surrounds the diffusion barrier (9), characterized in that Nb-containing filling elements (7, 8, 19, 20, 21, 24a-24h, 28, 29) are arranged in the intermediate region (6), each of which has a geometry that differs from the geometry of the Nb-containing rod element (5). According to the invention, the superconducting current-carrying capacity and mechanical robustness of the Nb3Sn superconducting wire can be improved.

The utility model relates to a mineral insulated power cable, which comprises a plurality of conductors, a graphene coating and an inner insulating layer are arranged outside each conductor, an outer insulating layer, a metal braided shielding layer, a tensile filling layer, a metal armor layer and an outer sheath are sequentially arranged outside the plurality of conductors, and mineral insulated fillers are arranged between the plurality of conductors and the outer insulating layer. According to the utility model, the outer wall of the conductor is coated with the graphene coating, so that a conductive layer can be formed, electromagnetic interference can be shielded, and the current-carrying capacity and high-voltage impact resistance of the conductor are improved; the inner insulating layer, the mineral insulating filler and the outer insulating layer form three-level insulating protection, so that electric leakage is further prevented; the air pore structure of the graphene foam layer is beneficial to improving the heat dissipation capability of the cable and preventing the current transmission performance of the cable from being reduced due to heat accumulation; the metal armor layer not only can improve the anti-puncture / anti-scratch performance of the cable, but also can increase the overall strength, so that a good protection effect is achieved; the tensile filling layer improves the tensile performance of the cable.

The present application relates to the technical field of cable state monitoring, in particular to a real-time thermal monitoring method for medium-voltage underground power cables based on wave velocity measurement.The present application extracts the propagation time offset of pulse signals at the two ends of the cable by using a cross-correlation algorithm, and calculates the relative change rate of wave velocity; for PILC cables, a sliding window least squares method is used to optimize the thermal response time constant, and a direct calibration model with adaptive soil thermal lag compensation is established; for XLPE cables, a segmented nonlinear dielectric constant correction model is constructed for the low-temperature zone, the transition zone and the high-temperature zone; when there is a lack of effective low-load cooling period, the thermal-electric equivalent model iteration calibration process is started, and the cable temperature distribution is output when the temperature deviation of adjacent two times is less than 0.5 DEG C. The present application does not need to deploy additional sensors, realizes real-time temperature monitoring of medium-voltage underground cables under different insulation types and different load modes, and provides a reliable basis for power grid dynamic load flow management.

The utility model relates to the technical field of wires and cables, in particular to an overhead semi-insulated cable, which can improve the safety performance and the comprehensive performance of the current-carrying capacity of an overhead cable and reduce the investment of the overhead insulated cable, and is provided with a conductor and an insulating sleeve positioned outside the conductor, and the insulating sleeve is provided with a longitudinal opening so that one part of the conductor is exposed. On the cross section of the cable, the central angle clamped by the exposed part of the conductor is 30-150 degrees, the longitudinal opening can be arranged between two iron towers in a spiral span mode when the cable is installed in an overhead mode, so that Karman vortex street oscillation of an overhead line in wind can be reduced, airflow scrapes through the gap of the opening along a spiral line, centripetal force can be formed, and the cable is prevented from being damaged. Therefore, the effect of stabilizing the electric wire is achieved.

This invention relates to the field of power transmission dispatching technology, specifically a dynamic load balancing dispatching method for power transmission lines based on reinforcement learning. The method involves: acquiring absolute elevation data, operating sag state parameters, and the elevation data of the terrain below to construct the insulation margin of the transmission line; acquiring meteorological data, and deriving the upper limit of stable operation based on the insulation margin and settlement displacement data, combined with the conductor expansion coefficient and span parameters, and calculating the safe current carrying capacity limit of the transmission line based on the thermal balance principle; obtaining tension distortion data based on the relative elevation difference change of the support structure and the real-time temperature quantification of the conductor, and mapping it together with the real-time branch power flow to the edge weights of the topology model, outputting an updated topology model; calculating the settlement deterioration rate, and inputting it along with the updated topology model into a reinforcement learning network to generate an initial dispatching scheme set; converting the initial dispatching scheme set into expected branch currents, verifying them using the safe current carrying capacity limit, outputting a safe candidate scheme set, and performing balanced dispatching.

The application provides a cooling and capacity-increasing overhead conductor, a dynamic ampacity determination method, a medium and equipment, and relates to the technical field of power transmission lines.The method sets the overhead conductor to adopt a three-layer composite structure, the outer layer is a passive cooling coating, the thickness is 50-200 mu m, the surface has micro-nano structures for enhancing mid-infrared radiation, the emissivity is greater than or equal to 0.92, and the contact angle is greater than 120 degrees after hydrophobic modification treatment;the intermediate layer is a high-conductivity aluminum alloy conductor layer, and the inner layer is a high-strength galvanized steel core;the coating and the conductor layer form a directional heat conduction path through a gradient thermal conductivity material, and the thermal conductivity coefficient of the gradient material increases from the coating to the conductor layer;the coating is coated in an axial segmented coating or a reticular coating manner.The overhead conductor can effectively increase the ampacity of the line and optimize the power transmission design of the line, and the dynamic ampacity determination method can obtain a quantitative index of the capacity-increasing effect.

The application provides a kind of AC cable current-carrying capacity prediction method and system, the method comprises: obtaining the first estimated current-carrying capacity of target cable, first estimated cable parameter and environmental parameter;The first estimated current-carrying capacity, the first estimated cable parameter and the environmental parameter are input to the preset simulation model, to make the simulation model output corresponding to the first estimated current-carrying capacity first predicted temperature value, wherein the simulation model includes electromagnetic field simulation calculation model and thermal simulation calculation model;When the first predicted temperature value is in the preset temperature range, the first estimated current-carrying capacity is output as predicted current-carrying capacity;When the first predicted temperature value is not in the preset temperature range, the first estimated current-carrying capacity is iteratively updated, until the second estimated current-carrying capacity corresponding to the second predicted temperature value after updating is located in the preset temperature range, and the second estimated current-carrying capacity is output as predicted current-carrying capacity, to improve the accuracy of current-carrying capacity prediction.