Critical current attenuation evaluation method and device of superconducting cable, terminal equipment and storage medium

Abstract

The invention discloses a critical current attenuation evaluation method and device of a superconducting cable, terminal equipment and a storage medium, and belongs to the technical field of superconducting cables. The method comprises the steps that winding parameters of each layer of superconducting tape in the superconducting cable are acquired; according to the winding parameters, performing stress analysis on each layer of superconducting tape, and determining the maximum main strain data of each layer of superconducting tape in the current spiral winding state; determining the actual critical current ratio of each layer of superconducting tape according to the maximum main strain data; and calculating the current attenuation value of the superconducting cable according to the actual critical current ratio and the theoretical rated current of the superconducting cable. Therefore, by implementing the application, the problem that the current attenuation evaluation result of the superconducting cable is inaccurate in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of superconducting cables, and particularly relates to a critical current attenuation evaluation method and device of a superconducting cable, a terminal equipment and a storage medium. BACKGROUND

[0002] In the manufacturing process of the CORC cable, the superconducting tapes will be spirally wound on the skeleton. During the winding process, the superconducting tapes will inevitably be deformed under the action of mechanical load, and then micro-cracks will be generated in the superconducting layer, thereby causing the degradation of the critical current and other superconducting properties of the superconducting cable, and even losing the superconducting performance, which seriously affects the operation safety of the superconducting device.

[0003] The existing method for evaluating the critical current attenuation of the superconducting cable mainly evaluates the current attenuation value of the cable as a whole according to a unified, fixed and conservative critical current degradation rate, which does not consider the actual situation that the performance attenuation of different layers in the cable is different due to different winding methods, and thus the evaluation result of the current attenuation of the superconducting cable is inaccurate. SUMMARY

[0004] The present application provides a critical current attenuation evaluation method and device of a superconducting cable, a terminal equipment and a storage medium, which can solve the problem of inaccurate evaluation result of the current attenuation of the superconducting cable in the prior art.

[0005] An embodiment of the present application provides a critical current attenuation evaluation method of a superconducting cable, comprising: obtaining winding parameters of each layer of superconducting tapes in the superconducting cable; performing stress analysis on each layer of superconducting tapes according to the winding parameters to determine maximum principal strain data of each layer of superconducting tapes under the current spiral winding state; determining an actual critical current ratio of each layer of superconducting tapes according to the maximum principal strain data; calculating a current attenuation value of the superconducting cable according to the actual critical current ratio and a theoretical rated current of the superconducting cable.

[0006] Further, the winding parameters include a winding angle and a winding radius. The stress analysis on each layer of superconducting tapes according to the winding parameters to determine the maximum principal strain data of each layer of superconducting tapes under the current spiral winding state comprises: generating a simulation model of each layer of superconducting tapes by performing winding simulation on each layer of superconducting tapes according to the winding angle and the winding radius by using a finite element analysis software; performing stress analysis according to the simulation model to determine the maximum principal strain data of each layer of superconducting tapes under the current spiral winding state.

[0007] Further, the determining of the actual critical current ratio of each layer of superconducting tape according to the maximum principal strain data comprises: obtaining a preset critical current mapping model; wherein the critical current mapping model is generated by fitting stress experimental parameters and experimental critical current data obtained by winding simulation and critical power experiment under a plurality of groups of winding experimental parameters of superconducting tapes with different structural geometric parameters; inputting the maximum principal strain data into the critical current mapping model to calculate the actual critical current of each layer of superconducting tape.

[0008] Further, the construction of the critical current mapping model comprises: obtaining a plurality of experimental superconducting tapes with different structural geometric parameters and a plurality of cylindrical nylon skeletons; wherein the radii of the cylindrical nylon skeletons are different; respectively setting the cylindrical nylon skeletons on a preset critical current measuring platform, and winding the experimental superconducting tapes with different structural geometric parameters on the cylindrical nylon skeletons at different winding angles; setting the critical current measuring platform in a low-temperature environment, and electrifying the cylindrical nylon skeletons, and recording the experimental critical current ratio of each experimental superconducting tape with different structural geometric parameters at each winding angle in the cylindrical nylon skeleton with each radius; simulating the maximum principal strain simulation data of each experimental superconducting tape with different structural geometric parameters at each winding angle in the cylindrical nylon skeleton with each radius by using a finite element software; fitting each group of corresponding radius, winding angle, experimental critical current ratio and maximum principal strain simulation data to construct the critical current mapping model.

[0009] Further, the calculating of the current attenuation value of the superconducting cable according to the actual critical current ratio and the theoretical rated current of the superconducting cable comprises: obtaining the theoretical critical current of each layer of superconducting tape in a long straight state; calculating the actual critical current of each layer of superconducting tape according to the theoretical critical current and the actual critical current ratio; accumulating the actual critical current to calculate the actual circulating current value of the superconducting cable; calculating the current attenuation value of the superconducting cable according to the actual circulating current value and the theoretical rated current.

[0010] An embodiment of the present application also provides a critical current attenuation evaluation device of a superconducting cable, comprising: a winding parameter acquisition module configured to acquire winding parameters of each layer of superconducting tape in the superconducting cable; a stress analysis module configured to perform stress analysis on each layer of superconducting tapes according to the winding parameters to determine maximum principal strain data of each layer of superconducting tapes in a current helical winding state; a critical current analysis module configured to determine actual critical current ratios of each layer of superconducting tapes according to the maximum principal strain data; a current attenuation evaluation module configured to calculate a current attenuation value of the superconducting cable according to the actual critical current ratios and a theoretical rated current of the superconducting cable.

[0011] Further, the winding parameters include a winding angle and a winding radius. The stress analysis module performs stress analysis on each layer of superconducting tapes according to the winding parameters to determine maximum principal strain data of each layer of superconducting tapes in a current helical winding state, including: a winding simulation is performed on each layer of superconducting tapes according to the winding angle and the winding radius by using a finite element analysis software to generate a simulation model of each layer of superconducting tapes; stress analysis is performed according to the simulation model to determine maximum principal strain data of each layer of superconducting tapes in a current helical winding state.

[0012] Further, the critical current analysis module determines actual critical current ratios of each layer of superconducting tapes according to the maximum principal strain data, including: a preset critical current mapping model is obtained; wherein the critical current mapping model is fitted from stress experimental parameters and experimental critical current data generated by winding simulation and critical power experiments of superconducting tapes with different structural geometric parameters under a plurality of groups of winding experimental parameters; the maximum principal strain data is input into the critical current mapping model to calculate actual critical currents of each layer of superconducting tapes.

[0013] The application further provides a terminal device, including: one or more processors; a memory coupled to the processor, configured to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement a critical current attenuation evaluation method of a superconducting cable as described in the above embodiments.

[0014] The application further provides a computer readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement a critical current attenuation evaluation method of a superconducting cable as described in the above embodiments.

[0015] The application has the following beneficial effects: The application provides a critical current attenuation evaluation method and device of a superconducting cable, a terminal equipment and a storage medium. The method obtains the winding parameters of each layer of superconducting tapes in the superconducting cable; performs stress analysis on each layer of superconducting tapes according to the winding parameters, and determines the maximum principal strain data of each layer of superconducting tapes in the current spiral winding state; determines the actual critical current ratio of each layer of superconducting tapes according to the maximum principal strain data; and calculates the current attenuation value of the superconducting cable according to the actual critical current ratio and the theoretical rated current of the superconducting cable. Therefore, the application performs stress analysis on the winding parameters of each layer of superconducting tapes respectively, analyzes the actual critical current ratio of each layer of superconducting tapes layer by layer, finally calculates the current attenuation value of the whole cable, and solves the problem of inaccurate current attenuation evaluation result of the superconducting cable in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a flowchart of a critical current attenuation evaluation method of a superconducting cable provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a critical current attenuation evaluation device of a superconducting cable provided by an embodiment of the present application; Figure 3 is a structural schematic diagram of a terminal equipment provided by an embodiment of the present application; Figure 4 is a schematic diagram of a dynamic winding model of a superconducting cable provided by an embodiment of the present application; Figure 5 is a normalized critical current distribution diagram provided by an embodiment of the present application; Figure 6 is a circuit connection diagram of a critical current measurement platform provided by an embodiment of the present application; Figure 7 is a schematic diagram of a cylindrical nylon skeleton provided by an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the terms "comprising," "comprises" and "including" and "has" and any variations thereof used herein are intended to cover a non-exclusive inclusion.

[0020] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0021] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, or necessarily alternatives to other embodiments. It will be explicitly and implicitly appreciated by a person of ordinary skill in the art that the embodiments described herein can be combined with other embodiments.

[0022] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0023] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0024] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix" and other terms should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0025] Reference Figure 1 To solve the problems in the prior art, an embodiment of the present application provides a critical current attenuation evaluation method of a superconducting cable, comprising: S1, obtaining the winding parameters of each layer of superconducting tapes in the superconducting cable; In a preferred embodiment of the present application, for each superconducting cable, the corresponding winding scheme is recorded during winding. According to the data recorded on the winding scheme, the winding parameters of each layer of superconducting tapes in the superconducting cable are obtained.

[0026] S2, performing stress analysis on each layer of superconducting tapes according to the winding parameters to determine the maximum principal strain data of each layer of superconducting tapes in the current spiral winding state; Preferably, the winding parameters include winding angle and winding radius. The stress analysis on each layer of superconducting tapes according to the winding parameters to determine the maximum principal strain data of each layer of superconducting tapes in the current spiral winding state comprises: According to the winding angle and the winding radius, a finite element analysis software is used to perform winding simulation on each layer of superconducting tapes to generate a simulation model of each layer of superconducting tapes; stress analysis is performed according to the simulation model to determine the maximum principal strain data of each layer of superconducting tapes in the current spiral winding state.

[0027] In a preferred embodiment of the present application, the dynamic winding model diagram of the CORC superconducting cable is as shown in Figure 4 The model mainly includes two parts of the cable core and the tape. In the modeling process, a reference point is set on the axis of the cable core. After coupling the undeformed cable core and one side of the superconducting tape with the reference point, the movement of the cable core is controlled by applying displacement boundary conditions on the reference point. Specifically, the boundary displacement condition refers to applying axial translation speed v and circumferential rotation angular velocity ω to the reference point during the winding of the cable, and setting the other four degrees of freedom to 0 to prevent deviation. In addition, a certain tension is applied along the length direction of the tape to prevent the tape from wrinkling during winding.

[0028] In combination with the strain data, in a certain range of winding parameters, by changing different winding angles and winding radii, different geometric parameters are set in the model to obtain different strain data, and then a stress analysis model is generated as follows: ; In the formula, ε 11_max is the maximum principal strain of the superconducting layer of the tape in the length direction; ε0 is the maximum intrinsic axial strain, which is also obtained by fitting experimental data, and only reflects the part of the strain of the tape itself when the winding parameters are all zero, that is, the long straight state, so it is named as the maximum intrinsic axial strain; p 10 , p 01 , p 11 , p 02 are fitting coefficients, r is the winding radius, and θ is the winding angle.

[0029] S3, according to the maximum principal strain data, determining the actual critical current ratio of each layer of superconducting tape; Preferably, the maximum principal strain data is determined according to the actual critical current ratio of each layer of superconducting tape, comprising: Obtaining a preset critical current mapping model; wherein the critical current mapping model is generated by fitting stress experimental parameters and experimental critical current data according to different structural geometric parameters of the superconducting tape under a plurality of groups of winding experimental parameters and winding simulation and critical power experiment; the maximum principal strain data is input into the critical current mapping model, and the actual critical current of each layer of superconducting tape is calculated.

[0030] In a preferred embodiment of the present application, the critical current mapping model is: ; Wherein I is the critical current of the tape after winding due to the mechanical effect; I0 is the rated critical current of the tape in the long straight state; I / I0 is the actual critical current ratio, indicating the amplitude of the critical current attenuation of the tape due to the mechanical effect of spiral winding; ε 11_max is the maximum principal strain of the superconducting layer of the tape in the length direction.

[0031] Preferably, the construction of the critical current mapping model comprises: Obtain several experimental superconducting tapes with different structural geometric parameters and several cylindrical nylon skeletons; the radii of the cylindrical nylon skeletons are different; the cylindrical nylon skeletons are arranged on a preset critical current measurement platform respectively, and the experimental superconducting tapes with different structural geometric parameters are wound on the cylindrical nylon skeletons at different winding angles; the critical current measurement platform is arranged in a low-temperature environment, and the cylindrical nylon skeletons are powered on, and the experimental critical current ratios of the experimental superconducting tapes with different structural geometric parameters at each winding angle in the cylindrical nylon skeletons with different radii are recorded; the finite element software is used to simulate the maximum principal strain simulation data of the experimental superconducting tapes with different structural geometric parameters at each winding angle in the cylindrical nylon skeletons with different radii; and the critical current mapping model is constructed by fitting each group of corresponding radius, winding angle, experimental critical current ratio and maximum principal strain simulation data.

[0032] In a preferred embodiment of the present application, the critical current measurement platform connection diagram is as shown in Figure 6 The platform includes a direct current power supply, a tape and low-temperature system, a shunt, a Keithley 3706 plug-in data acquisition system and a PC host computer, wherein the direct current power supply is used to provide a programmable direct current to apply a uniform rising current to the superconducting tape, observe the change of the voltage at both ends of the superconducting tape, and the current value corresponding to the resistive voltage of 1 mu V / cm is the critical current; the shunt is actually a small resistance with stable resistance, and the current value can be obtained by dividing the voltage at both ends of the resistance; the plug-in data acquisition system has high precision and can measure voltage signals of micro-volt level or even smaller, so it can be used for critical current measurement of superconducting tape samples.

[0033] A series of skeleton models with spiral grooves are customized before the experiment as shown in Figure 7 Black nylon material that can adapt to the low-temperature environment of liquid nitrogen is selected to assist the spiral winding process of the tape. In the experiment, the tape is wound on the cylindrical nylon groove skeleton, and the winding angle is gradually increased. The critical current of the tape is measured in the winding state. The critical current measurement device uses an epoxy plate as a frame, which is mainly composed of a fixed clamp plate and two copper joints with a certain inclination angle.

[0034] Further, the selected superconducting tape and the corresponding nylon skeleton are installed into the critical current measurement device, one end of the tape is fixed on the skeleton, and the winding is ready to start. Specifically, the superconducting tape is spirally wound in the groove of the nylon skeleton by hand or by controlling the equipment. During the winding process, the pitch of the winding is changed to gradually adjust and set different winding angles (theta). At the same time, a slight and constant tension is applied along the length direction of the tape to prevent the tape from wrinkling or loosening during the winding process.

[0035] After the tape is stably wound on the skeleton with a specific winding angle (θ) and winding radius (r), the winding state is maintained, and the entire system is placed in a low-temperature environment for cooling. Then, a measurement program is started: a direct current is applied to the tape by a direct current source, which starts from zero and increases uniformly. At the same time, a data acquisition system is used to monitor the voltage at both ends of the tape with high precision. When the resistive voltage at both ends of the tape reaches the set criterion (usually 1 μV / cm), the current value measured by the shunt at this time is recorded. This current value is the critical current (I) of the superconducting tape under the current winding parameters (r, θ), and the critical current (I) measured under the winding state is compared with the rated critical current (I0) of the same tape in a straight state (not wound). The experimental critical current ratio (I / I0) is calculated. The three key data of the current experiment are recorded: winding radius (r), winding angle (θ), and measured critical current ratio (I / I0).

[0036] Then, the tape sample is replaced or the nylon skeleton with a different groove radius is replaced to change the winding radius (r). On the same skeleton, a new winding angle (θ) is set by changing the winding pitch. For each tape, the above steps are repeated under a plurality of different (r, θ) combinations to obtain a large amount of experimental data.

[0037] Further, as shown in step S2, stress analysis is performed on the winding parameters of each set of experimental data, and an empirical formula of each set of experimental data with respect to the winding angle (θ) and the winding radius (r) is fitted; Taking the ST-4-E copper-plated tape as an example, after the stress-strain and critical current attenuation conditions are obtained respectively, a mathematical tool is used to fit the discrete point distribution to a curved surface distribution as shown in Figure 5 , and further derived as a mathematical formula for easy use. Due to the layered structure of the REBCO tape, the influence of the strain in the width direction of the superconducting tape on the critical current can be ignored, so only the principal strain in the length direction of the tape is considered, specifically the maximum principal strain data in the length direction of the middle part of the superconducting layer after modeling by abaqus according to the material properties and geometric parameters of the selected tape.

[0038] Finally, the normalized critical current (I / I0) and the maximum principal strain (ε 11_max ) are related to establish a critical current mapping model: .

[0039] S4, according to the actual critical current ratio and the theoretical rated current of the superconducting cable, calculate the current attenuation value of the superconducting cable.

[0040] Preferably, the calculation of the current attenuation value of the superconducting cable according to the actual critical current ratio and the theoretical rated current of the superconducting cable comprises: obtaining the theoretical critical current of each layer of superconducting tape in a long straight state; calculating the actual critical current of each layer of superconducting tape according to the theoretical critical current and the actual critical current ratio; accumulating the actual critical current to calculate the actual circulating current value of the superconducting cable; and calculating the current attenuation value of the superconducting cable according to the actual circulating current value and the theoretical rated current.

[0041] In a preferred embodiment of the present application, the winding scheme of a cable is known, the cable has n layers of superconducting tapes, and the winding angles θ1, θ2, θ3, … θn of each layer of tape are known. n The winding radii r1, r2, r3, … rn of each layer of tape are also known. n Given this, the normalized critical current attenuation amplitude I1 / I0, I2 / I0, I3 / I0, … In / I0 of each layer of tape due to spiral winding can be obtained for each layer of tape. n The actual circulating current value of the cable can be calculated by summing up the actual critical currents of each layer of tape, and the current attenuation value of the superconducting cable can be calculated by comparing the actual circulating current value with the theoretical rated current of the cable. When the current attenuation value exceeds a predetermined threshold, it can be determined that the superconducting cable has lost superconducting performance, which will seriously affect the safe operation of superconducting equipment.

[0042] Referring to Figure 2 is a critical current attenuation evaluation device for a superconducting cable provided by an embodiment of the present application, comprising: a winding parameter acquisition module configured to acquire winding parameters of each layer of superconducting tape in a superconducting cable; a stress analysis module configured to perform stress analysis on each layer of superconducting tape according to the winding parameters to determine maximum principal strain data of each layer of superconducting tape in a current spiral winding state; a critical current analysis module configured to determine an actual critical current ratio of each layer of superconducting tape according to the maximum principal strain data; a current attenuation evaluation module configured to calculate a current attenuation value of the superconducting cable according to the actual critical current ratio and a theoretical rated current of the superconducting cable.

[0043] Further, the winding parameters comprise a winding angle and a winding radius. The stress analysis module performs stress analysis on each layer of superconducting tape according to the winding parameters to determine maximum principal strain data of each layer of superconducting tape in a current spiral winding state, which comprises: According to the winding angle and the winding radius, the finite element analysis software is used to perform winding simulation on each layer of superconducting tapes to generate a simulation model of each layer of superconducting tapes; According to the simulation model, stress analysis is performed to determine maximum principal strain data of each layer of superconducting tapes in the current spiral winding state.

[0044] Further, the critical current analysis module determines the actual critical current ratio of each layer of superconducting tapes according to the maximum principal strain data, including: A preset critical current mapping model is obtained; wherein the critical current mapping model is generated by fitting stress experimental parameters and experimental critical current data obtained by performing winding simulation and critical power experiments on superconducting tapes with different structural geometric parameters under a plurality of groups of winding experimental parameters; The maximum principal strain data is input into the critical current mapping model to calculate the actual critical current of each layer of superconducting tapes.

[0045] It can be understood that the above device item embodiments correspond to the method item embodiments of the present application, and can realize the critical current decay evaluation method of the superconducting cable provided by any one of the above method item embodiments.

[0046] It should be noted that the device embodiments described above are only schematic, and part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the device embodiment provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which can be realized as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0047] Referring to Figure 3 The terminal device provided by the embodiment of the present application includes: One or more processors; Memory, coupled with the processor, for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the critical current decay evaluation method of the superconducting cable as described above.

[0048] The processor is configured to control overall operations of the terminal device to complete all or part of steps of the method for evaluating critical current decay of a superconducting cable. The memory is configured to store various types of data to support operations of the terminal device, which can include, for example, instructions for any application or method operating on the terminal device, and application-related data. The memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0049] In an exemplary embodiment, the terminal device can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements, to execute the method for evaluating critical current decay of a superconducting cable as described in any of the above embodiments, and achieve the technical effects consistent with the above method.

[0050] In another exemplary embodiment, a computer-readable storage medium including a computer program is also provided, which, when executed by a processor, implements steps of the method for evaluating critical current decay of a superconducting cable as described in any of the above embodiments. For example, the computer-readable storage medium can be the above-mentioned memory including the computer program, which can be executed by the processor of the terminal device to complete the method for evaluating critical current decay of a superconducting cable as described in any of the above embodiments, and achieve the technical effects consistent with the above method.

[0051] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can also make several improvements and refinements, these improvements and refinements are also considered the scope of protection of the present application.

Claims

1. A method of evaluating critical current decay of a superconducting cable, characterized by, The application relates to a method for calculating a current attenuation value of a superconducting cable. The method comprises the following steps: obtaining winding parameters of each layer of superconducting tapes in the superconducting cable; performing stress analysis on each layer of superconducting tapes according to the winding parameters to determine maximum principal strain data of each layer of superconducting tapes in a current spiral winding state; determining an actual critical current ratio of each layer of superconducting tapes according to the maximum principal strain data; 2. A method of evaluating critical current decay of a superconducting cable as claimed in claim 1, characterized in that, calculating the current attenuation value of the superconducting cable according to the actual critical current ratio and a theoretical rated current of the superconducting cable. The winding parameters comprise a winding angle and a winding radius. The stress analysis on each layer of superconducting tapes according to the winding parameters to determine the maximum principal strain data of each layer of superconducting tapes in the current spiral winding state comprises the following steps: adopting finite element analysis software to generate a simulation model of each layer of superconducting tapes according to the winding angle and the winding radius; 3. A method of evaluating critical current decay of a superconducting cable as claimed in claim 2, characterized in that, performing stress analysis according to the simulation model to determine the maximum principal strain data of each layer of superconducting tapes in the current spiral winding state. The determination of the actual critical current ratio of each layer of superconducting tapes according to the maximum principal strain data comprises the following steps: obtaining a preset critical current mapping model; wherein the critical current mapping model is fitted by stress experimental parameters and experimental critical current data generated by winding simulation and critical power experiments of superconducting tapes with different structural geometric parameters under a plurality of groups of winding experimental parameters; 4. A method of evaluating critical current decay of a superconducting cable as defined in claim 3, characterized in that, inputting the maximum principal strain data into the critical current mapping model to calculate the actual critical current of each layer of superconducting tapes. The construction of the critical current mapping model comprises the following steps: obtaining a plurality of experimental superconducting tapes with different structural geometric parameters and a plurality of cylindrical nylon skeletons; wherein the radii of the cylindrical nylon skeletons are different; respectively arranging the cylindrical nylon skeletons on a preset critical current measuring platform and winding the experimental superconducting tapes with different structural geometric parameters on the cylindrical nylon skeletons at different winding angles; arranging the critical current measuring platform in a low-temperature environment and electrifying the cylindrical nylon skeletons to record the experimental critical current ratio of the experimental superconducting tapes with different structural geometric parameters at each winding angle in the cylindrical nylon skeletons with different radii; adopting finite element software to simulate maximum principal strain simulation data of the experimental superconducting tapes with different structural geometric parameters at each winding angle in the cylindrical nylon skeletons with different radii; 5. A method of evaluating critical current decay of a superconducting cable as defined in claim 4, wherein fitting each group of corresponding radius, winding angle, experimental critical current ratio and maximum principal strain simulation data to construct the critical current mapping model. The calculation of the current attenuation value of the superconducting cable according to the actual critical current ratio and the theoretical rated current of the superconducting cable comprises the following steps: obtaining a theoretical critical current of each layer of superconducting tapes in a straight state; calculating the actual critical current of each layer of superconducting tapes according to the theoretical critical current and the actual critical current ratio; accumulating the actual critical currents to calculate an actual circulating current value of the superconducting cable; 6. A device for evaluating critical current decay of a superconducting cable, characterized by, calculating the current attenuation value of the superconducting cable according to the actual circulating current value and the theoretical rated current. The application relates to a method for calculating a current attenuation value of a superconducting cable. The winding parameter acquisition module is configured to acquire winding parameters of each layer of superconducting tapes in the superconducting cable. The stress analysis module is configured to perform stress analysis on each layer of superconducting tapes according to the winding parameters, and determine maximum principal strain data of each layer of superconducting tapes in a current spiral winding state. The critical current analysis module is configured to determine actual critical current ratios of each layer of superconducting tapes according to the maximum principal strain data. The current attenuation evaluation module is configured to calculate a current attenuation value of the superconducting cable according to the actual critical current ratios and a theoretical rated current of the superconducting cable.

7. An apparatus for evaluating critical current decay of a superconducting cable as defined in claim 6, wherein The winding parameters include a winding angle and a winding radius. The stress analysis module performs stress analysis on each layer of superconducting tapes according to the winding parameters, and determines maximum principal strain data of each layer of superconducting tapes in a current spiral winding state, including: The winding angle and the winding radius are input into a finite element analysis software to perform winding simulation on each layer of superconducting tapes, and generate a simulation model of each layer of superconducting tapes. The stress analysis module performs stress analysis on each layer of superconducting tapes according to the simulation model, and determines maximum principal strain data of each layer of superconducting tapes in a current spiral winding state.

8. An apparatus for evaluating critical current decay of a superconducting cable as defined in claim 7, wherein The critical current analysis module determines actual critical current ratios of each layer of superconducting tapes according to the maximum principal strain data, including: A preset critical current mapping model is acquired, wherein the critical current mapping model is fitted from stress experimental parameters and experimental critical current data generated by winding simulation and critical power experiments under a plurality of groups of winding experimental parameters of superconducting tapes with different structural geometric parameters. The maximum principal strain data is input into the critical current mapping model to calculate actual critical currents of each layer of superconducting tapes.

9. A terminal device, comprising: The computer program is executed by the processor to implement the superconducting cable critical current attenuation evaluation method according to any one of claims 1-5. The computer program is executed by the processor to implement the superconducting cable critical current attenuation evaluation method according to any one of claims 1-5. ​ ​ 10. A storage medium having stored thereon a computer program, characterized in that ​

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