CN115902423A - Device and method for testing alternating current loss characteristic of high-temperature superconducting strip in strong magnetic field - Google Patents
Device and method for testing alternating current loss characteristic of high-temperature superconducting strip in strong magnetic field Download PDFInfo
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Abstract
The invention discloses a device and a method for testing alternating current loss characteristics of a high-temperature superconducting strip in a high-intensity magnetic field, wherein the device comprises a superconducting magnet, an outer Dewar, an inner Dewar and a driving assembly, the superconducting magnet is provided with a through testing hole, the lower part of the outer Dewar is arranged in the testing hole, the inner Dewar is arranged in the outer Dewar, a rotatable upper guide wheel and a rotatable lower guide wheel are arranged in the inner Dewar, and the superconducting strip is wound on the upper guide wheel and the lower guide wheel in an annular shape; the driving assembly drives the upper guide wheel to rotate, and low-temperature liquid nitrogen is added into both the outer Dewar and the inner Dewar; the invention applies a magnetic field to the superconducting strip by the superconducting magnet with the magnet coil inside, can continuously and dynamically adjust the magnetic field intensity and the magnetic field change rate, and drives the superconducting strip to move in the magnetic field by the driving component to adjust the testing frequency, thereby realizing the alternating current loss test of the high-temperature superconducting strip in the high-frequency strong magnetic field.
Description
Technical Field
The invention relates to the technical field of high-temperature superconducting tape detection, in particular to a device and a method for testing the alternating current loss characteristic of a high-temperature superconducting tape in a strong magnetic field.
Background
The high-temperature superconducting tape has good current-carrying performance in a strong magnetic field, can run at a temperature higher than that of liquid helium, becomes an ideal material in a strong magnetic field and large-current application environment, and is widely applied to power cables, superconducting energy storage, superconducting motors, superconducting current limiters, strong magnetic field magnets and the like.
In practical application, a high-temperature superconducting tape is often in a strong magnetic field or complex electromagnetic environment, when a superconductor is in an alternating magnetic field environment, hysteresis loss can be generated inside the superconductor, and eddy current loss can be generated in a non-superconducting metal layer inside the superconducting tape. The generation of alternating current loss brings heating, when the refrigeration efficiency is insufficient, severe consequences such as quench damage and the like are easily caused, and therefore, the alternating current loss of the high-temperature superconducting material is a critical problem in superconducting application.
In the ac loss test of the high temperature superconducting tape, it is generally required to apply a magnetic field to the superconducting tape and further measure the power of the tape during the change of the magnetic field, thereby evaluating the ac loss characteristics of the tape. Current tests are usually performed under high frequency low field (< 50-200Hz, < 0.1T) conditions, or low frequency high field (< 0.001Hz, > 6T) conditions.
However, in a high-frequency low-magnetic-field environment, the superconductor does not easily reach a penetration state, and ac loss characteristics cannot be obtained in a higher magnetic field. On the other hand, the high-frequency strong magnetic field environment cannot be simulated in the low-frequency strong magnetic field environment, so that the alternating current loss characteristic of the superconductor under the condition of a large magnetic field change rate cannot be accurately predicted.
Disclosure of Invention
The invention aims to solve the technical problem that the AC loss test under a high-frequency strong magnetic field cannot be realized at the present stage, and aims to provide a device and a method for testing the AC loss characteristic of a high-temperature superconducting strip under the high-frequency strong magnetic field so as to realize the AC loss test of the high-temperature superconducting strip under the high-frequency strong magnetic field.
The invention is realized by the following technical scheme:
in a first aspect, a device for testing ac loss characteristics of a high-temperature superconducting tape in a high magnetic field comprises:
the superconducting magnet is provided with a through test hole on the upper side surface, and a magnet coil is wound on the test hole;
an outer dewar having a lower portion disposed within the test bore and an upper portion disposed above the superconducting magnet;
the inner Dewar is arranged inside the outer Dewar, a rotatable upper guide wheel and a rotatable lower guide wheel are arranged inside the inner Dewar, and the superconducting tape is wound on the upper guide wheel and the lower guide wheel in an annular shape;
a driving end of the driving assembly penetrates through the inner Dewar to be fixedly connected with the upper guide wheel and drives the upper guide wheel to rotate;
low-temperature liquid nitrogen is added into both the outer Dewar and the inner Dewar.
Specifically, the outer dewar further comprises: the outer Dewar liquid supplementing port and the outer Dewar air outlet are arranged at the upper end of the outer Dewar;
the inner Dewar further comprises an inner Dewar liquid supplementing port and an inner Dewar gas outlet which are arranged at the upper end of the inner Dewar, and a gas flowmeter is arranged at the position of the inner Dewar gas outlet.
Optionally, the inner dewar and the outer dewar are fixedly connected through a connecting rod, and the inner dewar liquid replenishing port and the inner dewar gas outlet are arranged outside through the outer dewar.
Optionally, the outer dewar comprises: a small diameter section disposed within the test bore and a large diameter section disposed above the superconducting magnet;
the lower end face of the large-diameter section is provided with a through hole communicated with the small-diameter section, the lower end face of the large-diameter section is attached to the upper end face of the superconducting magnet, the lower end of the inner Dewar penetrates through the through hole and is arranged in the small-diameter section, and a gap is formed between the outer side face of the inner Dewar and the inner side face of the small-diameter section.
Specifically, the lower guide wheel is arranged in the test hole, the upper guide wheel is arranged above the superconducting magnet, and the lower guide wheel is located at the magnetic field center of the superconducting magnet.
Optionally, the drive assembly comprises:
the upper transmission wheel is fixedly arranged on the outer side of the outer Dewar, and the torque input end of the upper transmission wheel is in power connection with the torque output end of the motor;
the lower transmission wheel is fixedly arranged on the outer side of the inner Dewar, a rotating shaft of the lower transmission wheel is coaxial and fixedly connected with a rotating shaft of the upper guide wheel through a transmission shaft, the transmission shaft is in dynamic seal with the inner Dewar, and the lower guide wheel is rotatably connected with the inner side surface of the inner Dewar through a support shaft;
and the transmission belt is in power connection with the upper transmission wheel and the lower transmission wheel, drives the lower transmission wheel to transmit through the upper transmission wheel, and penetrates through the outer Dewar and is in dynamic seal with the outer Dewar.
In a second aspect, a method for testing ac loss characteristics of a high-temperature superconducting tape in a strong magnetic field is based on the apparatus for testing ac loss characteristics of a high-temperature superconducting tape in a strong magnetic field, and the method comprises:
step one, installing a superconducting strip between an upper guide wheel and a lower guide wheel, and tensioning; then the inner dewar is installed into the outer dewar;
filling low-temperature liquid nitrogen into the inner Dewar and the outer Dewar;
driving the upper guide wheel to rotate and enabling the superconducting tape to continuously pass through the center of the magnetic field;
step four, determining the testing frequency f and the magnetic field condition of a testing period, wherein the testing period is that the superconducting tape moves from the farthest point to the central point of the magnetic field and then returns to the farthest point;
step five, after n test periods, determining the loss Q of the low-temperature liquid nitrogen in the inner Dewar;
step six, changing the test frequency under the condition of zero magnetic field, repeating the step four and the step five, and obtaining the liquid nitrogen loss Q of n test periods under different test frequencies under the condition of zero magnetic field 1 ；
Step seven, under the condition of fixing the testing frequency, gradually increasing the magnetic field of the superconducting magnet, and repeating the step four and the step five to obtain the liquid nitrogen loss Q of n testing periods under the condition of strong magnetic field 2 ；
Step eight, determining the alternating current loss under the strong magnetic field in a single test period:
optionally, the method for acquiring the test frequency f includes:
obtaining the advancing length L of the superconducting tape in a testing period;
obtaining the traveling speed v of the superconducting tape in a test period;
calculating to obtain a test frequency: f = v/L.
Optionally, the method of gradually increasing the magnetic field of the superconducting magnet comprises:
setting the average value B of the magnetic field m ；
The rate of change of the magnetic field is determined,
wherein B is the magnetic field strength and t is the time.
Optionally, the travel length is 2m, the travel speed is 20m/s to 100m/s, and the test frequency is 10Hz to 50Hz.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the superconducting tape is applied with the magnetic field through the superconducting magnet with the magnet coil inside, the magnetic field intensity and the magnetic field change rate can be continuously and dynamically adjusted, the driving assembly drives the superconducting tape to move in the magnetic field, and the testing frequency is adjusted, so that the alternating current loss test of the high-temperature superconducting tape in the high-frequency strong magnetic field can be realized, and the defect that the alternating current loss test of the high-temperature superconducting tape in the high-frequency strong magnetic field cannot be carried out in the prior art is overcome.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a front view of an apparatus for testing AC loss characteristics of a high temperature superconducting tape in a strong magnetic field according to the present invention.
FIG. 2 is a side view of an apparatus for testing AC loss characteristics of a high temperature superconducting tape in a strong magnetic field according to the present invention.
FIG. 3 is an overall configuration diagram of an apparatus for testing AC loss characteristics of a high temperature superconducting tape in a strong magnetic field according to the present invention.
Figure 4 is a graph of the magnetic field distribution during a superconducting tape routing process according to the present invention.
Reference numerals: 1. an inner Dewar liquid supplementing port, 2 an outer Dewar liquid supplementing port, 3 an outer Dewar flange, 4 an outer Dewar, 5 an inner Dewar, 6 a magnet coil, 7 a superconducting magnet, 8 a gas flowmeter, 9 an inner Dewar gas outlet, 10, an outer Dewar air outlet, 11, a connecting rod, 12, an upper guide wheel, 13, a superconducting strip, 14, a lower guide wheel, 15, an upper transmission wheel, 16, a motor, 17, a transmission belt, 18, a transmission shaft, 19, a lower transmission wheel, 20 and a support shaft.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant disclosure and are not to be considered as limiting.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
As shown in fig. 1, 2 and 3, the device for testing the ac loss characteristics of the high-temperature superconducting tape 13 in the strong magnetic field comprises a superconducting magnet 7, an outer dewar 4, an inner dewar 5 and a driving assembly.
The upper side of the superconducting magnet 7 is provided with a vertically downward penetrating testing hole, the magnet coil 6 is wound on the testing hole, the strength, frequency and the like of magnetic strength can be changed by changing the electrifying condition of the magnet coil 6, a changeable strong magnetic field is provided for a testing area, the lower end of the testing hole is communicated with the lower end face of the superconducting magnet 7, and the testing hole can be guaranteed to be at room temperature.
The lower part of the outer dewar 4 is arranged in the test hole, the upper part of the outer dewar 4 is arranged above the superconducting magnet 7, and the inner dewar 5 is arranged inside the outer dewar 4. The outer dewar 4 and the inner dewar 5 are coaxially arranged, and a gap is arranged between the inner dewar 5 and the outer dewar 4. The lower part of the inner dewar 5 is also set in the test hole, and the lower part of the outer dewar 4 and the lower part of the inner dewar 5 are used as test regions.
An upper guide wheel 12 and a lower guide wheel 14 which can rotate are arranged in the inner Dewar 5, and the superconducting tape 13 is wound on the upper guide wheel 12 and the lower guide wheel 14 in a ring shape; the driving end of the driving assembly passes through the inner Dewar 5 to be fixedly connected with the upper guide wheel 12 and drives the upper guide wheel 12 to rotate. The superconducting tape 13 is of an endless annular structure, a certain tension is applied through the upper guide wheel 12 and the lower guide wheel 14, and after the upper guide wheel 12 is driven to rotate through the driving assembly, the whole superconducting tape 13 can be continuously routed under the force of the inner Dewar 5, and the movement between the upper guide wheel 12 and the lower guide wheel 14 is realized.
The lower guide wheel 14 is arranged in the test hole, the upper guide wheel 12 is arranged above the superconducting magnet 7, and the lower guide wheel 14 is positioned at the magnetic field center of the superconducting magnet 7. Thereby, the superconducting tape 13 continuously passes through the center of the magnetic field of the superconducting magnet 7 at a certain frequency of more than 10Hz, and the purpose of applying a high-frequency strong magnetic field to the high-temperature superconducting tape 13 is realized.
Low-temperature liquid nitrogen is added into both the outer dewar 4 and the inner dewar 5, and in order to realize the addition of the low-temperature liquid nitrogen, the outer dewar 4 further comprises: an outer Dewar liquid supplementing port 2 and an outer Dewar air outlet 10 which are arranged at the upper end of the outer Dewar 4;
Liquid supplementing to low-temperature liquid nitrogen can be achieved through the liquid supplementing port, the liquid nitrogen can be discharged through the gas outlet after being gasified, and finally the nitrogen flow of the inner Dewar 5 can be detected through the gas flowmeter 8, so that the consumption of the liquid nitrogen is inferred.
The inner dewar 5 and the outer dewar 4 are fixedly connected through a connecting rod 11, and in the embodiment, the upper end of the inner dewar 5 is fixedly connected with the outer dewar flange 3 through the connecting rod 11.
Therefore, in order to realize the liquid charging and exhausting operation, the inner Dewar liquid supplementing port 1 and the inner Dewar air outlet 9 are arranged outside through the outer Dewar 4.
The drive assembly is required to drive the rotation of the upper idler 12 and thus includes an upper transfer wheel 15, a lower transfer wheel 19 and a transfer belt 17.
The upper transmission wheel 15 is fixedly arranged on the outer side of the outer Dewar 4, and the torque input end of the upper transmission wheel 15 is in power connection with the torque output end of the motor 16; the lower transmission wheel 19 is fixedly arranged on the outer side of the inner Dewar 5, the transmission belt 17 is in power connection with the upper transmission wheel 15 and the lower transmission wheel 19, and the lower transmission wheel 19 is driven to transmit through the upper transmission wheel 15.
That is, the upper transfer pulley 15 is rotated by the motor 16 and then the power is transmitted to the lower transfer pulley 19 through the transfer belt 17.
The rotating shaft of a lower transmission wheel 19 is coaxially and fixedly connected with the rotating shaft of an upper guide wheel 12 through a transmission shaft 18, and a lower guide wheel 14 is rotatably connected with the inner side surface of an inner Dewar 5 through a supporting shaft 20; the upper guide wheel 12 and the lower guide wheel 19 are coaxially and fixedly connected through the transmission shaft 18, so that the purpose of coaxially rotating the lower guide wheel 19 and the upper guide wheel 12 is achieved, the upper guide wheel 12 is driven to rotate through the motor 16, and then the advancing speed of the superconducting tape 13 can be adjusted by adjusting the rotating speed of the motor 16.
The transmission shaft 18 is in dynamic seal with the inner Dewar 5, and the transmission belt 17 passes through the outer Dewar 4 and is in dynamic seal with the outer Dewar 4, so as to avoid the leakage of low-temperature liquid nitrogen in the inner Dewar 5 and the outer Dewar 4.
Example two
As can be seen from the first embodiment, there is no specific requirement on the structures of the outer dewar 4 and the inner dewar 5, but in order to facilitate the fixation between the outer dewar 4 and the superconducting magnet 7, the present embodiment divides the outer dewar 4 into a large diameter section and a small diameter section, that is, the outer dewar 4 is in a "convex" type structure.
The outer dewar 4 includes: a small diameter section disposed within the test bore and a large diameter section disposed above the superconducting magnet 7.
The lower end face of the large-diameter section is provided with a through hole communicated with the small-diameter section, the lower end face of the large-diameter section is attached to the upper end face of the superconducting magnet 7, the lower end of the inner Dewar 5 penetrates through the through hole to be arranged in the small-diameter section, and a gap is formed between the outer side face of the inner Dewar 5 and the inner side face of the small-diameter section.
That is, as shown in fig. 1 and 2, when the outer dewar 4 is mounted, the lower end of the large-diameter section is placed on the upper end surface of the superconducting magnet 7, and because the diameter of the large-diameter section is larger than that of the test hole, the superconducting magnet 7 supports the large-diameter section, so that the outer dewar 4 can be prevented from continuously falling into the test hole, and the position of the outer dewar 4 and the superconducting magnet 7 in the up-down direction is fixed.
EXAMPLE III
The embodiment provides a method for testing the alternating current loss characteristic of a high-temperature superconducting tape 13 in a strong magnetic field based on the first embodiment and the second embodiment, and the method comprises the following steps:
step one, installing a superconducting tape 13 between an upper guide wheel 12 and a lower guide wheel 14, and tensioning; the inner dewar 5 is then mounted into the outer dewar 4 and the outer dewar 4 is mounted into the superconducting magnet 7.
Filling low-temperature liquid nitrogen into the inner Dewar 5 and the outer Dewar 4;
step three, turning on the motor 16 to drive the upper guide wheel 12 to rotate and enable the superconducting tape 13 to continuously pass through the center of the magnetic field;
step four, determining the testing frequency f and the magnetic field condition of a testing period, wherein the testing period is that the superconducting tape 13 moves from a farthest point to a magnetic field central point and then returns to the farthest point; the variation in magnetic strength is shown in fig. 4.
Step five, after n test periods, determining the loss Q of low-temperature liquid nitrogen in the inner Dewar 5; the nitrogen gas discharged from the inner dewar 5 is obtained by the gas flowmeter 8, and the loss amount is obtained by conversion.
Step six, changing the test frequency, namely changing the rotating speed of the motor 16, adjusting the line speed, and repeating the step four and the step five under the condition of zero magnetic field to obtain the liquid nitrogen loss Q of n test periods under different test frequencies under the condition of zero magnetic field 1 ；
Step seven, gradually increasing the magnetic field of the superconducting magnet 7 under the condition of fixed test frequency, and repeating the step four and the step five to obtain the liquid nitrogen loss Q of n test periods under the condition of strong magnetic field 2 ；
Step eight, determining the alternating current loss under the strong magnetic field in a single test period:
in addition, in step four, the method for acquiring the test frequency f includes:
the running length L of the superconducting tape 13 in one test cycle, which is the length of one turn of the superconducting tape 13, is obtained.
The traveling speed v of the superconducting tape 13 in one test cycle is obtained, and a changed test frequency can be obtained by changing v.
Calculating to obtain a test frequency: f = v/L.
In step seven, the method of gradually increasing the magnetic field of the superconducting magnet 7 includes:
setting the average value B of the magnetic field m ；
The rate of change of the magnetic field is determined,
wherein B is the magnetic field strength and t is the time.
Meanwhile, a specific value embodiment is provided, for example: the running length is 2m, the running speed is 20 m/s-100 m/s, and the test frequency is 10 Hz-50 Hz.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. Other variations or modifications may occur to those skilled in the art, which are based on the above-described invention, and which are still within the scope of the invention.
Claims (10)
1. A high-temperature superconducting tape alternating current loss characteristic testing device under a strong magnetic field is characterized by comprising:
the superconducting magnet (7) is provided with a through test hole on the upper side surface, and a magnet coil (6) is wound on the test hole;
an outer dewar (4) having a lower portion disposed within the test bore and an upper portion of the outer dewar (4) disposed above the superconducting magnet (7);
the inner Dewar (5) is arranged inside the outer Dewar (4), a rotatable upper guide wheel (12) and a rotatable lower guide wheel (14) are arranged inside the inner Dewar (5), and the superconducting tape (13) is wound on the upper guide wheel (12) and the lower guide wheel (14) in an annular shape;
the driving end of the driving component penetrates through the inner Dewar (5) to be fixedly connected with the upper guide wheel (12), and the driving component drives the upper guide wheel (12) to rotate;
and low-temperature liquid nitrogen is added into the outer Dewar (4) and the inner Dewar (5).
2. The device for testing the AC loss characteristics of the high-temperature superconducting tape in a strong magnetic field according to claim 1, wherein the outer Dewar (4) further comprises: an outer Dewar liquid supplementing port (2) and an outer Dewar air outlet (10) which are arranged at the upper end of the outer Dewar (4);
the inner dewar (5) further comprising: the inner Dewar liquid supplementing port (1) and the inner Dewar gas outlet (9) are arranged at the upper end of the inner Dewar (5), and a gas flowmeter (8) is arranged at the position of the inner Dewar gas outlet (9).
3. The device for testing the alternating current loss characteristic of the high-temperature superconducting tape in the strong magnetic field according to claim 2, wherein the inner Dewar (5) and the outer Dewar (4) are fixedly connected through a connecting rod (11), and the inner Dewar liquid supplementing port (1) and the inner Dewar gas outlet (9) are arranged outside through the outer Dewar (4).
4. The device for testing the AC loss characteristics of the high-temperature superconducting tape in a strong magnetic field according to claim 1, wherein the outer Dewar (4) comprises: a small diameter section disposed within the test bore and a large diameter section disposed above the superconducting magnet (7);
the lower end face of the large-diameter section is provided with a through hole communicated with the small-diameter section, the lower end face of the large-diameter section is attached to the upper end face of the superconducting magnet (7), the lower end of the inner Dewar (5) penetrates through the through hole to be arranged in the small-diameter section, and a gap is formed between the outer side face of the inner Dewar (5) and the inner side face of the small-diameter section.
5. The device for testing the AC loss characteristic of the high-temperature superconducting tape under the strong magnetic field according to claim 4, wherein the lower guide wheel (14) is arranged in the test hole, the upper guide wheel (12) is arranged above the superconducting magnet (7), and the lower guide wheel (14) is positioned at the magnetic field center of the superconducting magnet (7).
6. The apparatus for testing AC loss characteristics of a high temperature superconducting tape in a high magnetic field according to claim 4, wherein the driving assembly comprises:
the upper transmission wheel (15) is fixedly arranged on the outer side of the outer Dewar (4), and the torque input end of the upper transmission wheel (15) is in power connection with the torque output end of the motor (16);
the lower transmission wheel (19) is fixedly arranged on the outer side of the inner Dewar (5), a rotating shaft of the lower transmission wheel (19) is coaxial and fixedly connected with a rotating shaft of the upper guide wheel (12) through a transmission shaft (18), the transmission shaft (18) is in movable seal with the inner Dewar (5), and the lower guide wheel (14) is rotatably connected with the inner side surface of the inner Dewar (5) through a support shaft (20);
transmission belt (17), its with go up transmission wheel (15) with transmission wheel (19) power connection down, and pass through go up transmission wheel (15) drive transmission wheel (19) transmission down, transmission belt (17) pass outer dewar (4) and with outer dewar (4) movive seal.
7. A method for testing the alternating current loss characteristic of a high-temperature superconducting tape in a high-magnetic field, which is based on the device for testing the alternating current loss characteristic of the high-temperature superconducting tape in the high-magnetic field as claimed in claim 5 or 6, and is characterized by comprising the following steps:
step one, installing a superconducting tape (13) between an upper guide wheel (12) and a lower guide wheel (14) and tensioning; then the inner dewar (5) is installed into the outer dewar (4);
filling low-temperature liquid nitrogen into the inner Dewar (5) and the outer Dewar (4);
driving an upper guide wheel (12) to rotate, and enabling the superconducting tape (13) to continuously pass through the center of a magnetic field;
step four, determining the test frequency f and the magnetic field condition of a test period, wherein the test period is that the superconducting tape (13) moves from the farthest point to the magnetic field central point and then returns to the farthest point;
step five, after n test periods, determining the loss Q of the low-temperature liquid nitrogen in the inner Dewar (5);
step six, changing the test frequency under the condition of zero magnetic field, repeating the step four and the step five, and obtaining the liquid nitrogen loss Q of n test periods under different test frequencies under the condition of zero magnetic field 1 ；
Step seven, gradually increasing the magnetic field of the superconducting magnet (7) under the condition of fixed test frequency, and repeating the step four and the step five to obtain the liquid nitrogen loss Q of n test periods under the condition of strong magnetic field 2 ；
Step eight, determining the alternating current loss under the strong magnetic field in a single test periodConsumption:
8. the method for testing the alternating current loss characteristic of the high-temperature superconducting tape in the strong magnetic field according to claim 7, wherein the method for obtaining the test frequency f comprises the following steps:
obtaining a running length L of the superconducting tape (13) in a test period;
obtaining a speed v of travel of the superconducting tape (13) during a test cycle;
calculating to obtain a test frequency: f = vL.
9. The method for testing the AC loss characteristics of a high-temperature superconducting tape under a strong magnetic field according to claim 7, wherein the method for gradually increasing the magnetic field of the superconducting magnet (7) comprises the following steps:
setting the average value B of the magnetic field m ；
The rate of change of the magnetic field is determined,
wherein B is the magnetic field strength and t is the time.
10. The method as claimed in claim 8, wherein the running length is 2m, the running speed is 20m/s to 100m/s, and the testing frequency is 10Hz to 50Hz.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116110678A (en) * | 2023-04-07 | 2023-05-12 | 西安聚能超导磁体科技有限公司 | Measuring device for metal fluid velocity field and temperature field |
| CN116110678B (en) * | 2023-04-07 | 2023-06-13 | 西安聚能超导磁体科技有限公司 | Measuring device for metal fluid velocity field and temperature field |
| CN116256590A (en) * | 2023-05-16 | 2023-06-13 | 中国科学院合肥物质科学研究院 | High-temperature superconducting cable and coil alternating current loss testing device and testing method |
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