196 results about "Ampacity" patented technology

The invention discloses a guaranteed power supply quality monitoring and optimization method and system, and relates to the technical field of guaranteed power supply quality monitoring, and the method comprises the steps: obtaining electrical and environmental parameters in real time, modeling a power grid topology into graph data, extracting space correlation and time sequence evolution characteristics, and dynamically adjusting the attention weight of the space and time sequence characteristics, generating a joint feature vector, adaptively setting a dynamic threshold value, comparing real-time parameters in multiple dimensions, marking abnormal nodes, reversely tracing an upstream path of the abnormal nodes, calculating a proportion of impedance attenuation and current-carrying capacity reduction by combining environmental parameters, judging whether a fault point is a fault point, and considering an environmental cumulative effect of the fault point and a load sudden change frequency. And establishing an insulation aging and residual current-carrying capacity model, quantifying a safe operation interval, and implementing a dynamic compensation strategy. Through real-time monitoring, dynamic analysis and self-adaptive compensation, the stability, safety and efficiency of power grid operation are remarkably improved, faults are effectively prevented, and the service life of equipment is prolonged.

The invention discloses a current-carrying capacity analysis system and method for a copper-aluminum transition temporary drainage wire clamp, and relates to the technical field of wire clamp current-carrying capacity analysis, and the system comprises a wire clamp fastening force analysis module which is used for obtaining historical fastening force data, monitoring the relation between the current fastening force and contact resistance in real time, constructing a temperature change model, and analyzing the temperature change model; the optimal fastening force is determined based on an optimization model of the fastening force and the temperature, and the system comprises a first parameter acquisition unit, a wire clamp performance analysis unit and a fastening force control unit; the current-carrying capacity influence analysis module is used for determining the maximum current-carrying capacity of the wire clamp under the optimal condition by analyzing the influence of the fastening force and the temperature on the current-carrying capacity of the wire clamp, and comprises a second parameter acquisition module and a current-carrying capacity analysis unit; the wire clamp abnormity warning module is used for setting three-level warning and comprises a first-level abnormity warning module, a second-level abnormity warning module and a third-level abnormity warning module. According to the invention, the service life of the equipment is obviously prolonged, and the maintenance cost is reduced.

The invention discloses a coil shielding structure for a linear magnetic confinement nuclear fusion device, and relates to the technical field of nuclear fusion reactors. Comprising a first shielding layer made of a metal material and capable of coating a coil conductor in an insulating manner; and the second shielding layer is made of a metal material and is coated outside the first shielding layer, and an outer cold flow channel is arranged between the second shielding layer and the first shielding layer. The multiple shielding layers are arranged in a laminated mode, electromagnetic wave conduction can be hindered by consuming electromagnetic energy for multiple times, eddy currents generated by a variable magnetic field on coil conductors (quasi-steady-state and cusped coils) are reduced, temperature rise of the coils is reduced, the current-carrying capacity of the coils is improved, the thickness of the shielding layers can be designed to be very thin, and the shielding layers are not prone to deformation. While the eddy current is reduced, the design cost of a conductor material and the self mass of a magnet system are reduced, and meanwhile, the second shielding layer can serve as a stress part to reinforce the mechanical structural strength of the magnet and prevent electromagnetic force from directly acting on a magnet coil to influence the established structure of the magnet coil.

The invention provides a cooling capacity-increasing overhead conductor, a dynamic current-carrying capacity determination method, a medium and equipment, and relates to the technical field of power transmission lines, the method is characterized in that the overhead conductor adopts a three-layer composite structure, the outer layer is a passive cooling coating, the thickness is 50-200 [mu] m, the surface is provided with a micro-nano structure for enhancing mid-infrared radiation, the emissivity is greater than or equal to 0.92, and the dynamic current-carrying capacity is greater than or equal to 0.92; the contact angle is greater than 120 degrees through hydrophobic modification treatment; the middle layer is a high-conductivity aluminum alloy conductor layer, and the inner layer is a high-strength galvanized steel core; a directional heat conduction path is formed between the coating and the conductor layer through a gradient heat conduction material, and the heat conductivity coefficient of the gradient material is gradually increased from the coating to the conductor layer; the coating mode of the coating is axial segmented coating or net-shaped coating. According to the overhead conductor, the current-carrying capacity of the line can be effectively improved, the power transmission design of the line is optimized, and the quantitative index of the capacity increasing effect can be obtained through the dynamic current-carrying capacity determination method.

The invention relates to the technical field of power transmission and distribution of a power grid, in particular to a dynamic capacity increase risk prediction method for a high-voltage transmission line, a readable medium and equipment. The high-voltage power transmission line dynamic capacity increasing risk prediction method comprises the steps of collecting line temperature data of each point position of a corresponding power transmission line to form a data set; processing the data in the data set; calculating a rank correlation coefficient of the data; selecting the order of the fitting curve according to the absolute value of the rank correlation coefficient; obtaining a fitting approximate curve equation according to the order of the fitting curve; and performing prediction based on the fitting approximate curve equation, and outputting a prediction result. According to the scheme, the real-time temperature and the environment temperature of the temperature sensitive point position on the power transmission line and the current-carrying capacity data at the corresponding moment are measured, the corresponding relation algorithm of the difference value between the lead temperature and the environment temperature and the current-carrying capacity is constructed, and error feedback and adjustment are conducted at any time, so that the method has the advantages of being visual in calculation and rapid in adjustment; and the capacity increasing allowance and the safety in the subsequent short time can be predicted.

The invention relates to the technical field of submarine cables, in particular to a high-performance wet-type dynamic submarine cable which comprises a conductor, and a filling strip, a cabling wrapping tape, an inner sheath, an armor and an outer sheath are sequentially arranged on the outer side of the conductor from inside to outside. According to the high-performance wet-type dynamic submarine cable, the compressed circular copper oxide water-blocking conductor is adopted, the insulating layer is arranged on the surface of the copper conductor, the skin effect of the conductor is reduced, and the current-carrying capacity can be improved; the armoring is a double-layer reverse armoring, an inner layer bonding and outer layer non-bonding structure is adopted, through reverse twisting, torsion generated in the twisting process of the cable is effectively counteracted, so that the knotting and fracture risks caused by torsion in the laying and using processes of the cable are remarkably reduced, the anti-pressure capability and the dynamic flexibility are balanced through the layered design, and the service life of the cable is prolonged. The sliding frequency and the abrasion risk of outer-layer steel wires are reduced.

The invention discloses a current and temperature driven in-operation cable residual life prediction method and maintenance method in the technical field of reliability engineering, and the method comprises the steps: obtaining the inspection data of an in-operation cable, including cable surface temperature, environment humidity, armoring temperature and load current; inputting the related data into a pre-constructed cable equivalent thermal circuit model for iterative calculation to obtain a cable conductor temperature; calculating a heat loss factor based on a difference value between the temperature of the cable conductor and the temperature of the cable conductor in a preset ideal state, and obtaining the corresponding residual life of the cable in combination with the design life, the actual operation age limit and the heat loss factor of the cable; and establishing a cable residual life data set by using the inspection data and the cable residual life, and inputting the cable residual life data set and the corresponding environment humidity into the gray prediction model by combining the rated current-carrying capacity of the cable in operation to obtain a predicted value of the cable residual life. The cable aging degree can be quantitatively evaluated, and operation and maintenance management is optimized.

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 present invention relates to the field of offshore wind power technology, and provides a submarine cable comprising: a central pipe, a first electrical unit, a second electrical unit, and a third electrical unit; the central pipe is used to be filled with a cooling medium; the first electrical unit is coated on the outside of the central pipe, the first electrical unit includes a first phase conductor layer, the first phase conductor layer includes a plurality of first phase conductors; the second electrical unit is coated on the outside of the first electrical unit, the second electrical unit includes a second phase conductor layer, the second phase conductor layer includes a plurality of second phase conductors; the third electrical unit is coated on the outside of the second electrical unit, the third electrical unit includes a third phase conductor layer, the third phase conductor layer includes a plurality of third phase conductors, and the first phase conductor, the second phase conductor, and the third phase conductor are spirally wound. The above-mentioned submarine cable reduces the influence of the skin effect, reduces the resistance of the conductor, improves the current carrying capacity, and realizes the use of a smaller conductor cross-section to meet the demand for a larger transmission capacity.

The utility model discloses a copper core special-shaped monofilament conductor power cable, which comprises a cable conductor, the cable conductor comprises a circular monofilament, a plurality of first fan-shaped monofilaments, a plurality of second fan-shaped monofilaments and a plurality of third fan-shaped monofilaments, the first fan-shaped monofilaments are arranged on the outer side of the circular monofilament to form a first circular ring structure, and the second fan-shaped monofilaments are arranged on the outer side of the circular monofilament to form a second circular ring structure. The multiple second fan-shaped monofilaments are arranged on the outer side of the first circular ring structure to form a second circular ring structure, and the multiple third fan-shaped monofilaments are arranged on the outer side of the second circular ring structure to form a third circular ring structure. By changing the shape of the original circular monofilament, the situation that the resistivity of the monofilament is increased due to excessive deformation of the copper monofilament caused by extrusion is reduced; and meanwhile, through regular and tight arrangement and twisting during wire twisting, the compression coefficient of the conductor is improved, so that the direct-current resistance of the conductor is integrally reduced, and the current-carrying capacity and the operation safety of the cable are improved.

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 invention discloses a current-carrying capacity optimization method and device for a multi-optical-fiber built-in direct-current submarine cable, electronic equipment and a storage medium. The method comprises the steps that the first temperature of an optical fiber unit arranged on the outer surface of an insulation shielding layer, the second temperature of an optical fiber unit arranged in a polypropylene inner cushion layer and the direct-current resistance of a conductor are acquired; acquiring the thermal resistance of the conductor, the thermal resistance of each material layer and the third temperature of an optical fiber unit arranged in the center of the conductor under the condition that the first temperature or the second temperature exceeds the respective preset temperature threshold value; calculating and generating adjusted current-carrying capacity according to the thermal resistance of the conductor, the thermal resistance of each material layer, the first temperature, the second temperature, the third temperature and the direct-current resistance of the conductor; and optimizing the current-carrying capacity of the multi-fiber built-in DC submarine cable according to the adjusted current-carrying capacity. By implementing the method, the accuracy of optimizing the current-carrying capacity of the direct-current submarine cable can be improved.

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 invention provides a coating-conductor-steel core composite structure type power transmission conductor current-carrying capacity simulation evaluation system, belongs to the field of electric wire simulation evaluation, and solves the problems that efficient environment simulation cannot be performed on an electric wire coated with a coating, a current-carrying capacity simulation model cannot be established and the like. Comprising a wind speed simulation subsystem, a tension detection subsystem, a fixed experiment module and a mobile experiment module, a master control operation computer device is arranged on the outer side of the mobile experiment module, a sunlight simulation subsystem and a visual monitoring subsystem are arranged on the inner side of the mobile experiment module, and a cable temperature measurement subsystem and a temperature simulation subsystem are arranged in the mobile experiment module and the fixed experiment module. A rainfall simulation subsystem, a coating subsystem and eight cable clamping subsystems are arranged on the fixed experiment module, and a cable data subsystem, an analogue simulation subsystem, a current-carrying capacity calculation and evaluation subsystem and an early warning subsystem are arranged in the master control operation computer. According to the invention, environment simulation and simulation analysis can be carried out, and a conducting wire current-carrying capacity calculation simulation evaluation model coated with a coating is established.

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 utility model discloses a double parallel-wound induction coil for an induction furnace, belonging to the technical field of induction coils. The wound coils 1 and 2 and the water-cooled secondary coil stainless steel pipe are welded with fixing bolts and fixed on bakelite columns; the water inlet and outlet of the coils 1 and 2 are arranged in the middle of the cable outlet span on both sides and corresponding water inlet and outlet nozzles are arranged, the coils 1 and 2 are respectively connected to two wiring copper bars, and the welding of the outlet copper tube and the outlet connection busbar is completed according to the principle that the current of each copper tube busbar is consistent with the direction of the magnetic field. The upper and lower secondary windings of the coils 1 and 2 solve the demand for large current carrying capacity of the induction coil of the high-power induction furnace, and the cables are symmetrically output on both sides, which disperses and weakens the thermal and magnetic effects of strong electric and magnetic fields on the surrounding ferromagnetic components or electronic components. At the same time, the outlet cables are distributed on both sides, and the force on the coils is more dispersed and uniform, which will not cause damage to the coil structure.

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 utility model discloses a copper-aluminum composite plate current-carrying capacity test sample, which comprises a copper plate and an aluminum plate, the top surface of one end of the copper plate and the bottom surface of one end part of the aluminum plate are correspondingly crimped and are equal in width, and one end, far away from the aluminum plate, of the copper plate is connected with a first soft copper stranded wire through a first wire clamp drainage plate; the end, away from the copper plate, of the aluminum plate is connected with a second soft copper stranded wire through a second wire clamp drainage plate, the end, away from the copper plate, of the first soft copper stranded wire is connected with a large-current testing device, the large-current testing device is connected with the second soft copper stranded wire, the thickness of the copper plate is 5-8 mm, and the thickness of the aluminum plate is set to be twice that of the copper plate. The area of a composite area of the copper plate and the aluminum plate is equal to the vertical sectional area of the aluminum plate, current is loaded through a large-current test device and is conducted to the copper-aluminum composite plate through the soft copper stranded wire and the wire clamp drainage plate, so that the temperature of the sample is increased at a certain speed, the current value is gradually increased, and the temperature rise change of a copper material, an aluminum material and a copper-aluminum interface is detected by a temperature measurement sensor; and the copper-aluminum composite transition joint fails and is disconnected.

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 belongs to the technical field of contact wire preparation, and relates to a preparation method of a copper-zirconium alloy contact wire, the copper-zirconium alloy contact wire comprises the following elements in percentage by weight: 0.1-0.2% of Zr, less than or equal to 0.1% of impurities and the balance of Cu, and the preparation method comprises the following steps: (1) semi-continuous casting; (2) forging; (3) hot continuous rolling; (4) on-line solid solution strengthening; (5) cold machining; (6) aging heat treatment; and (7) cold deformation strengthening. According to the method, fine grain strengthening and solid solution strengthening are effectively combined through hot continuous rolling and online solid solution, the influence of grain growth caused by offline independent solid solution is avoided, and the mechanical performance is enhanced; compared with a conventional copper-magnesium alloy contact wire, the obtained copper-zirconium alloy contact wire has the advantages that the electric conductivity is improved by more than 10%, the corresponding current-carrying capacity can be higher under the same voltage, and the copper-zirconium alloy contact wire can be applied to high-speed railways and heavy haul railways with high current-carrying capacity requirements.

The invention belongs to the technical field of wire manufacturing, and discloses a high-temperature-resistant large-current-carrying wire for aviation and a preparation method. According to the invention, the nickel-plated flat copper wire is adopted, the insulating inner layer is made of high-temperature-resistant ECA fluoroplastic, and the insulating outer layer sheath is of a modified high-temperature-resistant ECA fluoroplastic structure with high thermal conductivity and high wear resistance, so that the long-term use temperature of the wire cable can reach 300 DEG C; under the same environment and copper conductor cross section, the downloading flow is improved by 25%; meanwhile, the carbon fiber and the glass fiber are added to the insulating outer layer, so that the cut-through resistance and the wear resistance are improved by 100%, and the problems that the temperature resistance grade is only 260 DEG C, the current-carrying capacity is insufficient, the cut-through resistance and the wear resistance of the outer layer of the wire are insufficient, and the wire is easy to damage and the like in an existing aviation wire and cable are effectively solved.

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.

Provided in the present application are a printed circuit board (PCB) power source structure and a manufacturing method therefor. The PCB power source structure comprises power source traces arranged on the surface of a PCB, wherein the power source traces comprise a copper-plated region and a laminated region, the laminated region is superimposed on the surface of the copper-plated region to form an integral conductor, and the respective cross-sectional areas of the copper-plated region and laminated region in the integral conductor are determined on the basis of the current-carrying capacity required by power source signals. In the present application, power source traces are formed by superimposing other metals on conventional copper traces for electrical conduction, such that the routing space of a power source network is greatly reduced while current conduction requirement of the power source network is met, thus facilitating the trace design of other signals, and avoiding the addition of layers of a PCB, thereby facilitating the miniaturization design of the PCB and reducing the manufacturing cost of the PCB.