279 results about "High temperature superconducting" patented technology

A bearing and flywheel system can include a first bearing portion having an opening of a first dimension there through and a central longitudinal axis, a second bearing portion having a second dimension, the second dimension being smaller than the first dimension, and a flywheel coupled to the second bearing portion. The bearing portions can include high-temperature superconductor(s) and / or magnets. The second bearing portion can be disposed at least partially within the opening through the first bearing portion. A gap can exist between an outer surface of the second bearing portion and an inner surface of the first bearing portion. The second bearing portion can be configured to rotate relative to the first bearing portion.

An on-line program control excitation power supply with quench protection for a high-temperature superconducting magnet comprises a single-chip microcomputer for receiving control data, outputting control voltage through digital-to-analog conversion (DAC) of the single-chip microcomputer, and magnetizing a magnet coil through current stepping; a sampling signal is output to the liquid crystal screen to display corresponding voltage and current values in real time after being processed by the single-chip microcomputer analog-to-digital conversion ADC; voltage signals at the two ends of the magnet coil are sampled and returned to the single-chip microcomputer to be processed, when high voltage occurs, it is judged that the voltage signals are abnormal voltage signals, quench protection is carried out, the single-chip microcomputer outputs control signals to cut off connection between the magnet coil and the excitation power source, and residual energy of the magnet coil is released through the high-power thyristor. The provided excitation power supply has the characteristics of high power, high stability, good repeatability and good linearity; performing numerical control stepping output, gradually applying current to the superconducting coil, and slowly establishing a magnetic field; effective quench protection is achieved, and it is guaranteed that a magnet coil is not damaged by quench.

The invention discloses a multi-field coupling fatigue test device and method for a high-temperature superconducting tape, and belongs to the field of superconducting tape fatigue tests.The multi-field coupling fatigue test device for the high-temperature superconducting tape comprises a fatigue testing machine, and a test container used for providing a low-temperature field is arranged in a test area of the fatigue testing machine; a clamp assembly used for fixing a sample to be tested is arranged in the experiment container, the clamp assembly is connected with a current assembly used for providing an electric field, and a magnet assembly used for providing a magnetic field is arranged in the experiment container. According to the multi-field coupling fatigue test device and method for the high-temperature superconducting strip, the limitation of an existing test means is broken through, and a reliable experimental platform and application value are provided for mechanical property research and service life evaluation of superconducting materials and other low-temperature service materials.

The embodiment of the invention provides a flywheel direct-driven cogeneration unit dynamic adjusting system and a control method thereof, in the embodiment of the invention, a magnetic suspension technology is adopted to eliminate friction of a traditional mechanical bearing, and quick starting and stopping of the rotating speed of a flywheel are realized; the high-temperature superconducting magnetic clutch achieves instantaneous mechanical coupling / decoupling of the flywheel and the circulating pump through the zero resistance characteristic, and the response time is short. The frequency modulation requirement of a new energy power grid can be matched, and meanwhile hard constraint of thermal load fluctuation on electric energy output is avoided. The mechanical direct-drive path directly utilizes the kinetic energy of the flywheel to drive the circulating pump, so that a multi-stage energy conversion link in a traditional mode is omitted; the electric adjusting path realizes bidirectional power exchange between the flywheel and a power grid through an energy interface device, and the loss of an inverter is reduced; and the high-temperature superconducting magnetic clutch realizes zero-energy-loss transmission in a coupling state. The magnetic suspension flywheel set adopts a non-contact suspension technology, so that mechanical wear is eliminated; the high-temperature superconducting magnetic clutch achieves non-contact transmission through magnetic coupling, and friction loss is avoided.

The invention discloses a critical current nondestructive testing device for a joint-free high-temperature superconducting tape. The critical current nondestructive testing device comprises a testing tape reel, a fixing plate, a testing tape reel motor rotating shaft, an air heater, a tension sensor, a wire guide wheel, a magnetizing device, a double-hole Hall sensor, a liquid nitrogen Dewar and the joint-free high-temperature superconducting tape. The test tape reel is used for placing the joint-free high-temperature superconducting tape; the testing tape reel motor rotating shaft is used for connecting the motor and the testing tape reel, and the air heater is used for blow-drying the tape to prevent the surface of the superconducting tape from freezing. The tension sensor is used for carrying out real-time and on-line monitoring on the tension applied to the superconducting tape. The wire guide wheel is of a bearing supporting structure and comprises a built-in deep groove ball bearing or sliding bearing. And the magnetizing device is used for magnetizing the high-temperature superconducting tape. The double-hole Hall sensor can detect magnetic field distribution on the surface of the magnetized strip. The double-hole Hall sensor is provided with a double-hole structure, and the slit strip is detected through the wire passing double holes.

The invention discloses a liquid hydrogen high-temperature superconducting motor and magnetofluid dual-power propulsion system, and aims to solve the problems that an existing ship propulsion system is single in power mode and insufficient in power density. The system comprises a liquid hydrogen storage and supply unit, a cooling unit, an energy conversion unit, a superconducting motor propulsion unit and a magnetofluid propulsion unit, the liquid hydrogen storage and supply unit conveys liquid hydrogen to the superconducting part through the cooling loop, the liquid hydrogen is converted into hydrogen through the heat exchanger after being cooled, the energy conversion unit converts the hydrogen into electric energy and outputs the electric energy in a matched mode, and the superconducting motor propulsion unit and the magnetic fluid propulsion unit generate mechanical energy or electromagnetic force through the electric energy to drive a ship. And the superconducting component is cooled by the cooling loop. The liquid hydrogen in the system has the dual functions of a cooling medium and fuel, a coolant and fuel do not need to be additionally configured, the requirements for silence, high thrust and rapid maneuvering are met, the power density is high, the environmental protection property is good, and the system is suitable for high-performance propelling scenes such as ships, especially submarines.

This invention relates to the field of high-temperature superconducting material performance testing technology, and particularly to a high-temperature superconducting tape testing device. The device includes a tape testing apparatus with tape winding and unwinding mechanisms at both ends. The apparatus includes a liquid nitrogen tank for storing liquid nitrogen. A portion of the tape to be tested is located within the liquid nitrogen tank, with both ends of the tape passing through through holes in the liquid nitrogen tank and wound onto winding and unwinding wheels in the tape winding and unwinding mechanisms. Each end of the testing apparatus has a tape reheating device, which includes a constant temperature chamber with an inlet and an outlet hole. This invention features a simpler and more rational structural layout, enabling better tape winding and unwinding operations and improving testing accuracy.

The utility model provides a cooling structure of a high-temperature superconducting coil assembly and a superconducting magnet. A cooling assembly of the cooling structure is attached to the outer surface of at least one side of the high-temperature superconducting coil assembly. The cooling assembly comprises a cold guide plate component and a plurality of cooling pipes, the surface of one side of the cold guide plate component in the thickness direction is attached to the outer surface of the corresponding side of the high-temperature superconducting coil assembly, and a plurality of mounting grooves extending in the thickness direction are further formed in the surface of the other side of the cold guide plate component. The multiple cooling pipes are arranged in the corresponding installation grooves in a matched mode, and the outer wall of each cooling pipe makes thermal contact with the inner wall of the corresponding installation groove. The cooling pipe is used for forced flow cooling, the cold guide plate component achieves conduction cooling, the heat exchange efficiency of the combination of the cooling pipe and the cold guide plate component is higher than that of a single heat exchange mode, and the mode that the cooling pipe is installed in the installation groove of the cold guide plate component enables the structure of the cooling assembly to be compact, and space is saved.

The invention discloses a high-temperature superconductive high-power dual-frequency band-pass filter based on a dual-mode resonator, and belongs to the field of microwave communication. The high-temperature superconductive high-power dual-frequency band-pass filter comprises a dual-mode resonator, the dual-mode resonator comprises a first branch knot, a second branch knot and a third branch knot, and one end of the first branch knot, one end of the second branch knot and one end of the third branch knot are connected to a center node at the same time. A first included angle is formed between the first branch knot and the second branch knot, a second included angle is formed between the second branch knot and the third branch knot, and a third included angle is formed between the first branch knot and the third branch knot. At least one of the first included angle, the second included angle and the third included angle is provided with a protruding part extending in the direction away from the center node. The high-temperature superconductive high-power dual-frequency band-pass filter can effectively improve the power capacity.

The invention relates to the technical field of high-temperature superconducting magnets, in particular to a control method for curing of a high-temperature superconducting magnet, and the method comprises the steps: judging whether the high-temperature superconducting magnet is clean or not according to curing environment data; when the judgment result is that the curing environment belongs to the clean state, obtaining preheating processing data of the high-temperature superconducting magnet and preheating the high-temperature superconducting magnet according to the preheating processing data of the high-temperature superconducting magnet; and after preheating is finished, curing processing data of the high-temperature superconducting magnet are obtained, and the high-temperature superconducting magnet is cured according to the curing processing data. In the preheating and curing process, automatic adjustment and control are carried out, it is guaranteed that the curing process of the magnet is carried out under the optimal condition, and the high-temperature superconducting magnet with excellent performance can be obtained easily.

The present invention relates to a high-temperature superconducting magnet and, more specifically, to: a high-temperature superconducting magnet achieving uniform critical current density using dissimilar metal wire materials; and a design parameter determination method thereof. To this end, in a high-temperature superconducting (HTS) magnet (100) formed by stacking an HTS coil (50) having a tape-type HTS conductor wire material wound thereon, the HTS coil (50) comprises: a first metal wire material (110) wound on the HTS coil (50); and a second metal wire material (130) that is made of a different metal from the first metal wire material (110) and wound while at least partially overlapping the first metal wire material (110) in the longitudinal direction of the first metal wire material (110), thereby forming a composite winding portion (140). Accordingly, the HTS magnet achieving uniform critical current density using dissimilar metal wire materials is provided, wherein the uniformity of the critical current density increases on the longitudinal cross-section of the HTS magnet (100).

The invention discloses a high-temperature superconducting cable equivalent analysis method, a high-temperature superconducting cable equivalent analysis system, a medium and electronic equipment, and relates to the technical field of power devices and superconducting power transmission. Constructing a first equivalent circuit model based on the structural characteristic parameter set, and performing cross generality screening on the material parameters by adopting a multi-factor influence separation method to obtain a first equivalent parameter set; constructing a first coupling model based on the first equivalent parameter set, and applying disturbance signals of different frequencies to perform fault simulation to obtain a working condition equivalent model; extracting transient response data based on the working condition equivalent model, and identifying transient quenching response characteristics of the high-temperature superconducting cable based on the transient response data; according to the method, a multi-objective optimization function is constructed based on transient quench response characteristics, control parameters are optimized by adopting an NSGA-III algorithm, an optimal control strategy is obtained, and the problems of high quench expansion risk and difficulty in timely regulation and control of the high-temperature superconducting cable under a transient fault are solved.

The invention relates to the technical field of superconducting cables, in particular to a three-dimensional heat-flow decoupling modeling method and device for a three-phase three-axis high-temperature superconducting cable, and the method comprises the steps: constructing a simplified three-phase three-axis high-temperature superconducting cable geometric model; constructing a temperature distribution finite element model, wherein the temperature distribution finite element model comprises a decoupled fluid model and a heat transfer model; the dynamic temperature distribution of the three-phase three-axis high-temperature superconducting cable under the influence of transient factors is solved by using a temperature distribution finite element model, and the method comprises the following steps: 1) a steady state step: based on an initial boundary condition, completing basic solution of a cable temperature field and a liquid nitrogen flow velocity field under a steady state through coupling calculation of a fluid module and a heat transfer module; 2) a transient step: taking a result value of steady-state solution as an initial condition of transient solution, and finally outputting a temperature distribution simulation result through multi-step transient solution iteration and flow field and temperature field distribution.Compared with the prior art, the method has the advantages of high modeling precision, small calculation amount, fast convergence and the like.

The invention provides a double-refrigeration device applied to high-temperature superconducting magnetic fluid propulsion, and relates to the technical field of high-temperature superconducting magnet cooling, the device comprises a magnet Dewar, a magnet liquid nitrogen cylinder, a fixing assembly and a conduction refrigeration system; the magnet liquid nitrogen cylinder is located in the magnet Dewar, one end of the fixing assembly is fixed to the side portion of the magnet liquid nitrogen cylinder, and the other end of the fixing assembly is fixed to the magnet Dewar; dewar protrusions are arranged on the circumferential side wall of the magnet Dewar, and the conduction refrigeration system is installed on the Dewar protrusions and exchanges heat with the superconducting magnet coil in the magnet liquid nitrogen cylinder. The superconducting magnet coil is also provided with a wiring port. The dual-refrigeration device provided by the invention breaks through the dilemma that the critical current cannot be tested after packaging, the liquid nitrogen cooling unit can independently, quickly and uniformly cool the packaged magnet, and the detachable sealing wiring port is arranged, so that the performance verification after packaging is realized, and the quality blind area is eliminated.

The application provides a magnetic levitation structure based on double-sided superconducting film, a control method, a system and an application, relates to the technical field of magnetic levitation, and comprises the magnetic levitation structure based on double-sided superconducting film provided by the application, which comprises a suspension force regulation and control unit, a permanent magnet array and a refrigeration unit. The suspension force regulation and control unit comprises double-sided high-temperature superconducting film, a conductive pattern, a printed circuit board and terminal wires. The double-sided high-temperature superconducting film is etched with the conductive pattern on both sides. At least one pair of terminal wires is connected to each side of the double-sided high-temperature superconducting film. The lead of the terminal wire is connected to the conductive pattern, and the lead terminal of the terminal wire is connected to the printed circuit board. The suspension force regulation and control unit is arranged in the magnetic field of the permanent magnet array. The refrigeration unit comprises a container and a cooling medium contained in the container, and the suspension force regulation and control unit is immersed in the cooling medium. The application realizes effective regulation and control of the suspension force of the magnetic levitation structure.

A method for fabricating a high-temperature superconductor HTS field coil using one or more HTS strips. Each HTS strip includes a layer of HTS material. The method includes: winding the one or more HTS strips around an axis to form a field coil comprising a winding of HTS strips; and removing material from at least a portion of the one or more windings from the axial edges of the one or more HTS strips to reduce the extent of the one or more HTS strips along the axis of the field coil.

This invention relates to a high-temperature superconducting cable, comprising: a metal skeleton, high-temperature superconducting tape, impregnated filler, a conductive metal layer, and a metal armor layer; a central cooling channel is provided in the center of the metal skeleton; the high-temperature superconducting tape is stacked into strands, with the entire strand spirally wound tightly against the metal skeleton; a conductive metal layer is wound around the outer side of the high-temperature superconducting tape, and a metal armor layer is also provided; the impregnated filler is filled into the gaps between each strand of the high-temperature superconducting tape using a vacuum pressure impregnation process. Compared with the prior art, in this invention, the high-temperature superconducting tape is stacked into strands and wound on the metal skeleton, and the neatly stacked tape is less susceptible to mechanical damage; there are gaps between the strands of the high-temperature superconducting tape, and the size of the gaps can be changed when the cable is bent, so the high-temperature superconducting tape is less likely to be damaged by excessive stress when the cable is bent; after the cable is bent, the gaps between the strands of the high-temperature superconducting tape can be filled by vacuum pressure impregnation, improving the thermal conductivity and mechanical strength of the cable.

The invention provides a high-temperature superconducting weak magnetic detection device and system, and the device comprises a Dewar which is internally provided with a refrigerant; the reading circuit module comprises a reading circuit board and a shielding shell; an annular cavity is formed in the shielding shell, and the reading circuit board is arranged in the shielding shell; the embedded structure is inserted into the Dewar, an installation position of an SQUID chip is arranged on the embedded structure, and a lead channel is arranged on the side wall of the embedded structure; and the heat insulation structure is fixed and filled in the upper end opening of the embedded structure. According to the high-temperature superconducting weak magnetic detection device and system, connectors and fasteners do not need to be disassembled and assembled frequently in the refrigerant filling process, and operation is convenient; electrostatic point discharge is not easy to generate, and the electrostatic damage rate of the high-temperature SQUID is reduced; the high-temperature SQUID does not need to be exposed in the air in the refrigerant filling process, performance degradation of the SQUID is avoided, and the service life and the performance stability of the SQUID are further ensured; the fault rate of the system is reduced in practical application, and the reliability and stability of the system are improved.

The invention discloses a thermal deformation pre-compensation method for a coreless superconducting cyclotron, and the method comprises the following steps: building a coreless high-temperature superconducting coil three-dimensional model which comprises a plurality of coils with different shapes and positions in the coreless high-temperature superconducting coil; carrying out a complete cooling process from 300K to 20K, and calculating form and position thermal deformation deviations of coils with different shapes and different positions in the model; pre-compensation calculation of the model is conducted through the form and position thermal deformation deviation; according to the pre-compensation amount at the low temperature of 20 K, the pre-compensation amount at the temperature of 300 K is reversely deduced, and the pre-compensation amount comprises a radial amplification coefficient and an axial amplification parameter; and iteration is repeated until the error between the 300K model with the pre-compensation amount and the design target is smaller than the error range. According to the method, the problems that in the prior art, the capability of accurately predicting the deformation behavior of the coil in the extreme temperature change process before the manufacturing stage is lacked, the positive design of pre-compensation cannot be actively carried out, and the basis of quantitative design is lacked are solved.

The application discloses a high-temperature superconducting conductor and a preparation method thereof, and relates to the technical field of high-temperature superconductivity, wherein the conductor comprises an inner pipe body and an outer pipe body arranged coaxially, a liquid nitrogen convection cooling zone is formed in the inner pipe body, and a vacuum heat insulation cavity is formed between the inner pipe body and the outer pipe body. By forming the liquid nitrogen convection cooling zone in the inner pipe body and the vacuum heat insulation cavity between the inner pipe body and the outer pipe body, the liquid nitrogen can directly soak the superconducting cable for efficient heat exchange, the vacuum heat insulation cavity effectively blocks the radial conduction of environmental heat to the inner pipe body, and the heat load of the refrigeration system is greatly reduced; by electrically connecting the low-temperature end electrode and the superconducting cable and connecting the room-temperature end electrode and the low-temperature end electrode in series to form a loop, the room-temperature end electrode is avoided from directly contacting the superconducting cable, the axial heat leakage along the electrode is reduced, and one end of the liquid nitrogen cooling pipe is communicated with the inner pipe body and the other end of the liquid nitrogen cooling pipe extends to the outside through the outer pipe body, so that the stable supply and the sealing reliability of the liquid nitrogen are ensured.

The invention provides a high-temperature superconducting maglev vehicle system, and relates to the technical field of maglev vehicles, the high-temperature superconducting maglev vehicle system comprises a track, and the track is provided with a permanent magnet plate; mounting parts are respectively arranged at two ends of the frame in the length direction; the multiple suspension device assemblies are connected with the mounting parts in a one-to-one correspondence mode, and the suspension device assemblies are suitable for rotating in the horizontal direction and / or the vertical direction relative to the mounting parts. According to the high-temperature superconducting magnetic levitation vehicle system, the suspension device assembly is suitable for rotating in the horizontal direction and / or the vertical direction relative to the mounting part, so that the vehicle body has stable suspension force when passing through a horizontal curve, the influence of lateral force is reduced, the safety and comfort of vehicle body driving are improved, and the service life of the vehicle body is prolonged. Meanwhile, when the vehicle body passes through a climbing or downhill road section with a small vertical curve radius, the suspension device assembly can be stably matched with the permanent magnet plate on the track, so that the suspension capacity of the vehicle body passing through the vertical curve radius is improved, and collision between the suspension device assembly and the permanent magnet plate is avoided.

The invention discloses a non-contact continuous nondestructive testing device and method for critical current uniformity of a high-temperature superconducting tape, which is applied to the field of superconducting material detection, and comprises an excitation magnet for generating a background magnetic field and exciting the high-temperature superconducting tape to generate magnetization current; the measuring probe consists of a magnetic circuit iron core, a fluxgate sensor and a copper strip compensation loop; the fluxgate sensor and the copper strip compensation loop are respectively connected with the control and measurement circuit through a fluxgate power supply acquisition circuit and a copper strip compensation loop power supply circuit; and the control and measurement circuit is used for implementing PID (Proportion Integration Differentiation) control through closed-loop negative feedback when the fluxgate sensor detects that the net residual magnetic flux in the magnetic circuit iron core is not zero, generating magnetic flux which is equal to and opposite to the high-temperature superconducting strip in size in the copper strip compensation loop, and calculating critical current according to current in the copper strip compensation loop when the net residual magnetic flux is zero. According to the method, rapid and accurate measurement of the critical current uniformity of the high-temperature superconducting strip without depending on a Hall sensor and calibration back calculation is realized.

The invention provides a high-temperature superconducting induction heating control method and system based on multi-physics field coupling, and the method comprises the steps: driving a heat conduction model through eddy-current loss data outputted by a three-dimensional electromagnetic field model, and feeding back the temperature distribution data of the heat conduction model to the three-dimensional electromagnetic field model for parameter correction. Meanwhile, the temperature distribution data and the eddy-current loss data respectively drive a stress-strain model to calculate structural deformation to form a closed-loop link, finally, multi-field data dynamic interactive convergence is realized by adopting an iterative solution algorithm, and consistency and precision of output data of each physical field are ensured through a preset threshold value. Finally, cooperative control over temperature field uniformity, structural stability and energy efficiency in the heating process is achieved.

The application relates to a robust optimization design method of an airborne high-temperature superconducting generator, which comprises the following steps: a baseline design scheme is obtained by establishing a two-dimensional electromagnetic finite element baseline model and a total loss accounting model of the generator containing electromagnetic characteristics of superconducting coils; a feasible technical scheme set is obtained by performing scheme screening on pre-engineering hard constraints; an optimal candidate scheme is determined by performing fast optimization on the feasible domain by using a Taguchi orthogonal test, and the optimal candidate scheme is determined by main effect and range analysis or signal-to-noise ratio calculation; and a final design scheme is determined by taking the minimum performance fluctuation or the maximum signal-to-noise ratio as a criterion by introducing cold end temperature fluctuation, air gap assembly deviation, tape critical current dispersion and load and speed disturbance as noise factors for robust verification. The application can efficiently obtain an optimal design with high performance, strong engineering feasibility and operation robustness under limited simulation resources, and is especially suitable for a megawatt airborne high-temperature superconducting power generation system.

Provided herein are systems, methods, and techniques disclosed herein to help overcome certain challenges associated with superconducting tape shrinkage in stellarators. Provided herein are methods of forming a stellarator coil with improved volume utilization percentages from a cable bent into a tapered helical shape. Provided herein are methods and systems for generating a coil. Provided herein are methods and systems used for stabilizing high-temperature superconducting (HTS) tapes, including using a structure composed of a thin spine and struts to suspend the HTS tapes. Provided herein are insulations materials for high temperature superconductors. Provided herein are systems, methods, and techniques for using independent bobbins for dispending each layer of superconducting tape to a stellarator coil.

The present invention relates to a sensorless current control method of a non-insulation high-temperature superconducting coil, comprising steps in which: a command output unit outputs a magnetic field command to a coil; a voltage detection unit detects a voltage of the coil if a current is supplied to the coil according to the magnetic field command; a magnetic field calculation unit uses a Kalman filter on the basis of the voltage of the coil and the current that is output according to the magnetic field command, so as to calculate the magnetic field of the coil; and a magnetic field control unit controls the magnetic field of the coil on the basis of a magnetic field calculation value.

A superconductor cable (21) for a superconductor cable assembly (22), a superconducter cable assembly, and a system (100) for preventing damage to at least one superconductor cable assembly is provided. The superconductor cable may comprise: a superconductor region (19), the superconductor region (19) comprising: high temperature superconductor material, optionally high temperature superconductor tapes (23), and a first metallic stabilizer material (24); a layer of ohmic heating material (25) at least partially surrounding the superconductor region (19).

The application discloses a resonator and a compact ultra-narrow-band high-temperature superconducting filter, which adopts SISO spiral structure and interdigital structure to form a dual composite left-right hand resonator in parallel, wherein the interdigital structure forms an open end of the resonator, the SISO spiral structure forms a closed end of the resonator, and the interdigital structure is composed of a plurality of mutually parallel interdigital branches; the interdigital structure is used for introducing a left-hand capacitor and increasing an equivalent capacitance of the resonator; a first end of the interdigital structure is directly connected with a microstrip line and spirals in a clockwise direction, spirals out in a counterclockwise direction along the microstrip line at a rotation center, bypasses the interdigital structure, is connected to a second end of the interdigital structure to form the SISO spiral structure; and the overall filter size can be greatly reduced, the insertion loss in a passband of the filter, the out-of-band suppression capability, the roll-off coefficient of a transition band are greatly improved, and the selectivity of the filter is enhanced.

The invention discloses a segmented damage detection device for a high-temperature superconductive double-pancake coil, which belongs to the technical field of high-temperature superconductive strip testing and comprises a bottom support plate, a bottom plate, the high-temperature superconductive double-pancake coil, a cover plate and an external voltage detection device. The bottom plate is arranged on the bottom supporting plate, the high-temperature superconducting double-pancake coil is located on the upper surface of the bottom plate, and the cover plate covers the upper portion of the high-temperature superconducting double-pancake coil. A plurality of contact screws respectively pass through a plurality of array-distributed bottom plate test threaded holes or cover plate test threaded holes in the cover plate and the bottom plate, and are in contact with the surface of the high-temperature superconductive double-pancake coil through screwing, and the tops of the contact screws are connected with an external voltage detection device through welding; the voltage value between every two contact screws is tested, the position where abnormal voltage occurs is positioned, and the damaged section in the high-temperature superconducting double-pancake coil is judged. Through segmented detection of the array type threaded contacts, accurate positioning of the damaged position of the double-pancake coil is achieved, and the problem that in the prior art, a defect area is difficult to accurately recognize is solved.