Test device for ground module of magnetic levitation electromagnetic propulsion system

Abstract

This invention relates to the field of high-speed magnetic levitation transportation technology and discloses a test device for a ground module of a magnetic levitation electromagnetic propulsion system. The device includes a superconducting magnet, a ground test bench, a frequency converter, a through-core transformer, a high-voltage generator, connecting leads, dry-type terminals, and two power supply cables for the tested module. The tested ground module and the superconducting magnet are arranged opposite each other on the ground test bench. One end of the power supply cable for the tested module is equipped with a dry-type terminal, and the other end is connected to the lead-out end of the propulsion coil of the tested ground module. The dry-type terminal of one power supply cable passes through the through-core transformer and is connected to the dry-type terminal of the other power supply cable through a connector to form a conductive loop. The connection point of the dry-type terminal is connected to the high-voltage generator through connecting leads. The frequency converter is connected to one vertical side of the through-core transformer. The shielding shell of the tested ground module and the shielding layer of the tested power supply cables are grounded. This allows for multi-field coupling durability testing.

Description

Technical Field

[0001] This invention relates to the field of high-speed magnetic levitation transportation technology, and in particular to a test device for a ground module of a magnetic levitation electromagnetic propulsion system. Background Technology

[0002] Superconducting magnetic levitation systems, composed of zero-flux coils and superconducting magnets, offer advantages such as high drag ratio, self-stabilizing levitation guidance, and large levitation gap. Superconducting linear synchronous motor systems, composed of hollow propulsion coils and superconducting magnets, boast advantages such as high power density, low loss, and high efficiency. The combination of these two technologies to form a magnetic levitation electromagnetic propulsion system holds broad application prospects in high-speed and ultra-high-speed rail transportation.

[0003] The stator part of the magnetic levitation electromagnetic propulsion system, namely the levitation propulsion ground module, is laid in a one-time, long-distance, and large-scale manner. Its working life requirements are generally the same as those of the track line. That is, the ground module is required to have extremely high durability and service life under long-term high voltage, high current and electromagnetic vibration working environment. Moreover, its durability needs to be proven through ground tests before mass production and laying.

[0004] Durability testing of ground modules for levitation propulsion systems includes electromagnetic vibration assessment, current-carrying thermal aging assessment, high-voltage insulation assessment, and other environmental adaptability assessments throughout the entire lifespan. Before mass production, the ground modules need to be subjected to loads such as current temperature rise, voltage, and vibration expected to occur throughout their entire lifespan, either in equal or accelerated aging forms, on the prototype. The changes in insulation and structural performance of the modules during the full-lifespan load loading process are then assessed to accurately evaluate the module's service life.

[0005] Currently, durability testing of ground modules is conducted sequentially in a single physical field, such as first performing a full-life insulation aging test, then a full-life mechanical vibration test, and finally a full-life current-carrying temperature rise test. However, this sequential approach to module life testing results in a long testing cycle, leading to higher time and financial costs for module product finalization. Summary of the Invention

[0006] This invention provides a test device for ground modules of magnetic levitation electromagnetic propulsion systems, which can solve the technical problems in the prior art.

[0007] This invention provides a test apparatus for a ground module of a magnetic levitation electromagnetic propulsion system. The apparatus includes: a superconducting magnet, a ground test bench, a frequency converter, a through-core transformer, a high-voltage generator, connecting leads, dry terminals, and two power supply cables for the test module. The test ground module and the superconducting magnet are arranged opposite each other on the ground test bench. One end of each power supply cable for the test module is connected to the dry terminal, and the other end is connected to the lead-out end of the propulsion coil of the test ground module. The dry terminal of one power supply cable passes through the through-core transformer and is connected to the dry terminal of the other power supply cable for the test module via a connector to form a conductive loop. The connection point of the dry terminal is connected to the high-voltage generator via the connecting leads. The frequency converter is connected to one vertical side of the through-core transformer. The shielding shell of the test ground module and the shielding layer of the power supply cables for the test module are grounded.

[0008] Preferably, the device further includes a test ground module and two test module power supply cables. The test ground module is equipped with a temperature detection unit for measuring the internal temperature of the test ground module. One end of the test module power supply cable is provided with the dry-type terminal, and the other end is connected to the lead-out end of the propulsion coil of the test ground module. The dry-type terminal of one test module power supply cable passes through the through-core transformer and is connected to the dry-type terminal of the other test module power supply cable through the connector to form a conductive loop.

[0009] Preferably, the connector is a bolt.

[0010] Preferably, the temperature detection unit is embedded in the internal conductor of the test ground module.

[0011] Preferably, the temperature detection unit is a temperature sensor.

[0012] The present invention also provides a test device for a ground module of a magnetic levitation electromagnetic propulsion system. The device includes: a superconducting magnet, a ground test bench, a frequency converter, a through-core transformer, a high-voltage generator, connecting leads, dry terminals, and two power supply cables for the tested module. The tested ground module and the superconducting magnet are arranged opposite each other on the ground test bench. One end of each power supply cable for the tested module is connected to the dry terminal, and the other end is connected to the lead-out end of the levitation coil of the tested ground module. The dry terminal of one power supply cable passes through the through-core transformer and is connected to the dry terminal of the other power supply cable for the tested module via a connector to form a conductive loop. The connection point of the dry terminal is connected to the high-voltage generator via the connecting leads. The frequency converter is connected to one vertical side of the through-core transformer. The shielding shell of the tested ground module and the shielding layer of the power supply cables for the tested module are grounded.

[0013] Preferably, the device further includes a test ground module and two test module power supply cables. The test ground module is equipped with a temperature detection unit for measuring the internal temperature of the test ground module. One end of the test module power supply cable is provided with the dry-type terminal, and the other end is connected to the lead-out end of the suspension coil of the test ground module. The dry-type terminal of one test module power supply cable passes through the through-core transformer and is connected to the dry-type terminal of the other test module power supply cable through the connector to form a conductive loop.

[0014] Preferably, the connector is a bolt.

[0015] Preferably, the temperature detection unit is embedded in the internal conductor of the test ground module.

[0016] Preferably, the temperature detection unit is a temperature sensor.

[0017] Through the above technical solution, only the load amplification factor due to time acceleration needs to be considered during each single load application process, without introducing the coupling effect coefficient of other physical fields. This allows for the complete application of electromagnetic vibration and voltage loads throughout the entire life cycle to the ground module on a ground test bench in a single test, while maintaining the thermal equilibrium temperature of the module body at the actual current-carrying temperature rise. In other words, the test device described in this invention enables the ground module to simultaneously undergo multi-physics durability tests, including electromagnetic vibration, voltage insulation aging, and current-carrying temperature rise durability assessment. Furthermore, the test device described in this invention can generate high voltage and high current simultaneously in a ground test with a very small capacity for a single ground module, and the applied voltage and current frequencies are adjustable, simultaneously meeting the application requirements of the variable frequency current for electromagnetic vibration and the fixed frequency voltage for insulation electrical aging. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0019] Figure 1 A schematic diagram of a test apparatus for a ground module of a magnetic levitation electromagnetic propulsion system according to an embodiment of the present invention is shown.

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Ground module under test; 11. Power supply cable for the module under test; 2. Superconducting magnet;

[0022] 3. Ground test bench; 4. Variable frequency power supply; 5. Through-core transformer;

[0023] 6. Ground module for testing; 61. Power supply cable for the testing module; 7. High-voltage generator;

[0024] 71 Connecting leads. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] Figure 1 A schematic diagram of a test apparatus for a ground module of a magnetic levitation electromagnetic propulsion system according to an embodiment of the present invention is shown.

[0029] The ground module includes a high-voltage propulsion coil that serves as the stator winding of a linear motor and a zero-flux coil (levitation coil) that serves as the levitation guide winding.

[0030] like Figure 1 As shown, this embodiment of the invention provides a test device for a ground module of a magnetic levitation electromagnetic propulsion system. The device includes: a superconducting magnet 2, a ground test bench 3, a frequency converter 4, a through-core transformer 5, a high-voltage generator 7, connecting leads 71, a dry-type terminal, and two power supply cables (high-voltage cables) 11 for the tested module. The tested ground module 1 and the superconducting magnet 2 are arranged opposite each other on the ground test bench 3. One end of each power supply cable 11 for the tested module is equipped with the dry-type terminal (which can perform high-voltage testing), and the other end is connected to the... The lead-out end of the propulsion coil of the ground module under test 1 is connected, and the dry terminal of one power supply cable 11 of the test module passes through the through-core transformer 5 and is connected to the dry terminal of another power supply cable 11 of the test module through a connector to form a conductive loop. The connection point of the dry terminal is connected to the high voltage generator 7 through the connecting lead 71. The frequency converter 4 is connected to one vertical side of the through-core transformer 5. The shielding shell of the ground module under test 1 and the shielding layer of the power supply cable 11 of the test module are grounded.

[0031] Specifically, a superconducting magnet is used to provide a stable background magnetic field. The test ground module interacts with the superconducting magnet to generate electromagnetic vibration force. A frequency converter current source is connected to the primary side of a through-core transformer, and the circuit formed by the power supply cable of the test module passes through the hollow transformer as the secondary side. The frequency converter excitation current is applied to the propulsion coil circuit through a contactless inductive power supply method. When the energized propulsion coil generates electromagnetic vibration amplitude and frequency relative to the superconducting magnet, the test ground module can complete the full life cycle electromagnetic load loading test on the ground test bench. The high-voltage generator is connected to the electrical connection point of the dry-type terminal of the two high-voltage cables through high-voltage connection leads, so that the propulsion coil and the high-voltage cable circuit form an equipotential high-voltage state. At the same time, the outer surface shielding shell of the test ground module and the surface shielding layer of the cable are grounded, so that a stable voltage difference is formed between the conductor and the module shell, and the durability of the module-cable main insulation structure is tested (the insulation performance of the main insulation under electromagnetic vibration is tested during the test, and the partial discharge of the power supply circuit under long-term electromagnetic vibration and conductor temperature rise can also be monitored to clarify the degradation of the main insulation).

[0032] In other words, electromagnetic vibration and insulation electrical aging tests can be performed simultaneously on the propulsion coils of the ground module under test.

[0033] Through the above technical solution, only the load amplification factor due to time acceleration needs to be considered during each single load application process, without introducing the coupling effect coefficient of other physical fields. This allows for the complete application of electromagnetic vibration and voltage loads throughout the entire life cycle to the ground module on a ground test bench in a single test, while maintaining the thermal equilibrium temperature of the module body at the actual current-carrying temperature rise. In other words, the test device described in this invention enables the ground module to simultaneously undergo multi-physics durability tests, including electromagnetic vibration, voltage insulation aging, and current-carrying temperature rise durability assessment. Furthermore, the test device described in this invention can generate high voltage and high current simultaneously in a ground test with a very small capacity for a single ground module, and the applied voltage and current frequencies are adjustable, simultaneously meeting the application requirements of the variable frequency current for electromagnetic vibration and the fixed frequency voltage for insulation electrical aging.

[0034] According to one embodiment of the present invention, the device further includes a test ground module 6 and two test module power supply cables 61. The test ground module 6 is provided with a temperature detection unit for measuring the internal temperature of the test ground module 6. One end of the test module power supply cable 61 is provided with the dry terminal, and the other end is connected to the lead-out end of the propulsion coil of the test ground module 6. The dry terminal of one test module power supply cable 61 passes through the through-core transformer 5 and is connected to the dry terminal of the other test module power supply cable 61 through the connector to form a conductive circuit.

[0035] In other words, using the same inductive power supply method via a feedthrough transformer, a test ground module with the same structural form but an internal temperature sensor embedded in its conductor is supplied with the same excitation current as the test ground module, and the temperature rise of its internal conductor is monitored. Because the structural form and load current are the same, the temperature rise of the conductor in the test module is consistent with that of the test module.

[0036] Furthermore, this temperature monitoring can simultaneously feed back to the ground test bench's environmental cooling system. By adjusting the temperature of the ground module's environmental cooling system, the ground module can achieve a thermal steady state that does not exceed the upper limit of the insulation allowable limit during long-term ground electromagnetic vibration testing. More specifically, the cooling environment temperature of the test bench can be adjusted based on the internal current-carrying conductor temperature rise data provided by the test ground module, ensuring that the tested ground module operates under the same heat dissipation conditions as the test ground module. It can also ensure that the conductor temperature of the tested ground module reaches its maximum thermal stability temperature for actual long-term use, allowing for thermal aging testing of the conductor-insulation structure.

[0037] Therefore, during the electromagnetic vibration durability test of the tested ground module, the temperature of the internal conductors can be monitored and controlled to avoid damage caused by excessive current flow time and temperature exceeding the insulation limit during long-term electromagnetic vibration. In other words, the propulsion coils of the tested ground module can undergo thermal aging tests simultaneously with electromagnetic vibration and insulation electrical aging tests.

[0038] The number of through-core transformers 5 can be two, one for the tested ground module 1 and the other for the auxiliary ground module 6, such as... Figure 1 As shown.

[0039] According to one embodiment of the present invention, the connecting member is a bolt.

[0040] According to one embodiment of the present invention, the temperature detection unit is embedded in the internal conductor of the test ground module 6.

[0041] This allows for better monitoring of the temperature of the conductors inside the tested ground module.

[0042] According to one embodiment of the present invention, the temperature detection unit is a temperature sensor.

[0043] The above description of the bolts and temperature sensors is merely exemplary and not intended to limit the invention.

[0044] This invention also provides a test device for a ground module of a magnetic levitation electromagnetic propulsion system. The device includes: a superconducting magnet, a ground test bench, a frequency converter, a through-core transformer, a high-voltage generator, connecting leads, a dry-type terminal, and two power supply cables for the tested module. The tested ground module and the superconducting magnet are arranged opposite each other on the ground test bench. One end of each power supply cable for the tested module is connected to the dry-type terminal, and the other end is connected to the lead-out end of the levitation coil of the tested ground module. The dry-type terminal of one power supply cable passes through the through-core transformer and is connected to the dry-type terminal of the other power supply cable for the tested module via a connector to form a conductive loop. The connection point of the dry-type terminal is connected to the high-voltage generator via the connecting leads. The frequency converter is connected to one vertical side of the through-core transformer. The shielding shell of the tested ground module and the shielding layer of the power supply cables for the tested module are grounded.

[0045] In other words, electromagnetic vibration and insulation aging tests can be performed simultaneously on the levitation coil of the ground module under test.

[0046] Through the above technical solution, only the load amplification factor due to time acceleration needs to be considered during each single load application process, without introducing the coupling effect coefficient of other physical fields. This allows for the complete application of electromagnetic vibration and voltage loads throughout the entire life cycle to the ground module on a ground test bench in a single test, while maintaining the thermal equilibrium temperature of the module body at the actual current-carrying temperature rise. In other words, the test device described in this invention enables the ground module to simultaneously undergo multi-physical field durability tests (multi-field coupling durability tests) assessing electromagnetic vibration, voltage insulation aging, and current-carrying temperature rise durability. Furthermore, the test device described in this invention can generate high voltage and high current simultaneously in a ground test with a very small capacity for a single ground module, and the applied voltage and current frequencies are adjustable, simultaneously meeting the application requirements of the variable frequency current for electromagnetic vibration and the fixed frequency voltage for insulation electrical aging.

[0047] According to one embodiment of the present invention, the device further includes a test ground module and two test module power supply cables. The test ground module is provided with a temperature detection unit for measuring the internal temperature of the test ground module. One end of the test module power supply cable is provided with the dry terminal, and the other end is connected to the lead end of the suspension coil of the test ground module. The dry terminal of one test module power supply cable passes through the through-core transformer and is connected to the dry terminal of the other test module power supply cable through the connector to form a conductive loop.

[0048] Therefore, the propulsion coil of the ground module under test can be subjected to electromagnetic vibration and insulation aging tests at the same time as thermal aging tests.

[0049] According to one embodiment of the present invention, the connecting member is a bolt.

[0050] According to one embodiment of the present invention, the temperature detection unit is embedded in the internal conductor of the test ground module.

[0051] According to one embodiment of the present invention, the temperature detection unit is a temperature sensor.

[0052] The testing process for the levitation coil of the ground module under test is similar to that for the propulsion coil. Please refer to the description of the propulsion coil above, and it will not be repeated here.

[0053] In this invention, during multi-field coupling durability testing, the duration and frequency of high voltage, alternating electromagnetic vibration, and the maximum conductor temperature during continuous operation under the highest temperature environment throughout the entire life cycle of the ground module can be calculated in advance. Then, based on the accelerated aging principle and acceleration coefficient of insulation electrical aging and the accelerated aging principle and acceleration coefficient of structural vibration fatigue, the durability test time and corresponding loading voltage and current for completing the entire life cycle electromagnetic load and voltage loading within the same timeframe can be calculated. The specific calculation process can employ methods already available in the prior art; to avoid obscuring this invention, it will not be elaborated upon here.

[0054] As can be seen from the above embodiments, taking the propulsion coil as an example, the test device of the present invention has at least the following advantages compared with the prior art:

[0055] 1) By providing the ground module excitation current through a feedthrough transformer in the form of mutual inductance, the output current amplitude of the current source can be reduced by increasing the turns ratio of the primary and secondary sides, thereby reducing the overall resistance loss of the current source circuit. The load of the excitation current supply circuit is only a single drive coil resistive-inductive load, requiring a very small converter capacity;

[0056] 2) The power supply voltage source is connected to the propulsion coil circuit in a single-point connection form, so that the propulsion coil as a whole does not show a voltage difference, while a high voltage difference can be formed on the grounding surface of the module. Since it is a single-point connection, the connection circuit current between the high voltage generator and the propulsion coil circuit is extremely small and can be ignored if the main insulation is not damaged. Therefore, the required high voltage generator capacity is also small.

[0057] 3) Since the high-voltage generator only provides a high voltage at the same potential to the propulsion coil circuit without providing current, even if the frequency of the electrical aging test voltage is different from the frequency of the excitation current required for electromagnetic vibration, the high-voltage generator will not cause additional interference to the excitation current source through the feedthrough transformer. Similarly, because the impedance and inductance parameters of a single propulsion coil circuit are extremely small, the induced voltage generated by the excitation current in the coil circuit is more than two orders of magnitude smaller than the electrical aging test voltage, so the excitation current will not cause voltage interference to the high-voltage generator.

[0058] 4) The presence of the test ground module can effectively monitor the temperature rise of the conductor of the test module and perform environmental control without damaging the main insulation of the test module. It can make the temperature of the conductor inside the module thermally stable at the upper limit of the design temperature while the module body is subjected to long-term electromagnetic vibration and electrical aging tests, and introduce thermal aging into the durability test at the same time.

[0059] 5) Multi-field coupling durability testing can complete three tests that were originally conducted in series in one test assessment, without the participation of any coupling influence coefficient, and can apply the most realistic durability test conditions to the module in the shortest time.

[0060] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0061] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test device for a ground module of a magnetic levitation electromagnetic propulsion system, characterized in that The device includes: a superconducting magnet (2), a ground test bench (3), a frequency converter (4), a through-core transformer (5), a high-voltage generator (7), connecting leads (71), a dry-type terminal, and two power supply cables (11) for the test module. The test ground module (1) and the superconducting magnet (2) are arranged opposite to each other on the ground test bench (3). One end of the power supply cable (11) for the test module is equipped with the dry-type terminal, and the other end is connected to the lead-out end of the propulsion coil of the test ground module (1). The dry-type terminal of the test module power supply cable (11) passes through the through-core transformer (5) and is connected to the dry-type terminal of another test module power supply cable (11) through a connector to form a conductive loop. The connection point of the dry-type terminal is connected to the high-voltage generator (7) through the connecting lead (71). The frequency converter (4) is connected to one vertical side of the through-core transformer (5). The shielding shell of the test ground module (1) and the shielding layer of the test module power supply cable (11) are grounded.

2. The apparatus of claim 1, wherein, The device also includes a test ground module (6) and two test module power supply cables (61). The test ground module (6) is equipped with a temperature detection unit to measure the internal temperature of the test ground module (6). One end of the test module power supply cable (61) is equipped with the dry terminal, and the other end is connected to the lead-out end of the propulsion coil of the test ground module (6). The dry terminal of one test module power supply cable (61) passes through the through-core transformer (5) and is connected to the dry terminal of the other test module power supply cable (61) through the connector to form a conductive loop.

3. The apparatus of claim 2, wherein, The connecting component is a bolt.

4. The apparatus according to claim 2, characterized in that, The temperature detection unit is embedded in the internal conductor of the test ground module (6).

5. The apparatus according to claim 4, characterized in that, The temperature detection unit is a temperature sensor.

6. A test device for a ground module of a magnetic levitation electromagnetic propulsion system, characterized in that, The device includes: a superconducting magnet, a ground test bench, a frequency converter, a through-core transformer, a high-voltage generator, connecting leads, dry terminals, and two power supply cables for the test module. The test ground module and the superconducting magnet are arranged opposite each other on the ground test bench. One end of the power supply cable for the test module is equipped with the dry terminal, and the other end is connected to the lead-out end of the suspension coil of the test ground module. The dry terminal of one power supply cable passes through the through-core transformer and is connected to the dry terminal of the other power supply cable for the test module through a connector to form a conductive loop. The connection point of the dry terminal is connected to the high-voltage generator through the connecting leads. The frequency converter is connected to one vertical side of the through-core transformer. The shielding shell of the test ground module and the shielding layer of the power supply cable for the test module are grounded.

7. The apparatus according to claim 6, characterized in that, The device also includes a test ground module and two test module power supply cables. The test ground module is equipped with a temperature detection unit to measure the internal temperature of the test ground module. One end of the test module power supply cable is equipped with the dry terminal, and the other end is connected to the lead end of the suspension coil of the test ground module. The dry terminal of one test module power supply cable passes through the through-core transformer and is connected to the dry terminal of the other test module power supply cable through the connector to form a conductive loop.

8. The apparatus according to claim 7, characterized in that, The connecting component is a bolt.

9. The apparatus according to claim 7, characterized in that, The temperature detection unit is embedded in the internal conductor of the test ground module.

10. The apparatus according to claim 9, characterized in that, The temperature detection unit is a temperature sensor.

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