A testing device and method for rapidly evaluating the shielding performance of steel tape for cables

Abstract

The application discloses a kind of test device and method for quickly evaluating the shielding performance of cable steel strip, belong to cable technical field.Device includes power supply, copper busbar, copper bar, measurement loop and cooling circulation system;The copper bar is connected with the power supply by the copper busbar;The measurement loop is arranged outside the copper bar;The cooling circulation system is arranged inside the copper bar.This device sets fixed simulation electric field interference environment for steel strip, embeds cooling circulation system, can effectively take away the heat generated by sample due to large current induction in test process, so as to effectively inhibit sample temperature rise, can greatly reduce the test data error caused by sample temperature rise, fundamentally reduce the test data error caused thereby, realize the accurate judgment of cable electromagnetic shielding performance.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically to a testing device and method for rapidly evaluating the shielding performance of steel tape in cables. Background Technology

[0002] In an era of high-speed, heavy-haul, and high-density development in railway transportation, the practice of laying signal cables, optical cables, and power cables in the same trench has become increasingly common. This layout has brought significant problems to AC electrified railway sections. Signal cables must not only withstand electromagnetic interference generated by train traction currents but also cope with the significant impact of interference currents from nearby power cables, posing an unprecedented challenge to their transmission quality. Against this backdrop, the shielding performance of signal cables has been given higher requirements, becoming a key factor in ensuring stable railway signal transmission and safe train operation.

[0003] To meet design and practical application requirements, signal cable manufacturers are actively engaged in the design and development of cables with special shielding structures. Currently, in electrified railway sections, aluminum tubes and steel strips are widely used as the main electromagnetic shielding materials in signal cables. The shielding effectiveness of the armored steel strip directly affects the overall performance of the signal cable. How to quickly and accurately select armored steel strips with high shielding effectiveness has become a core technical challenge that wire and cable manufacturers urgently need to overcome. Solving this problem is not only crucial to the market competitiveness of the company's products but also plays a vital role in the stable operation of the railway signaling system.

[0004] Currently, the Epstein square method and the shielded room method are common methods for evaluating the magnetic shielding performance of metal strips. The Epstein square method is mainly used for measuring the magnetic properties of silicon steel sheets, requiring the sample to be cut to a specific standard size. However, this approach has serious drawbacks; it cannot realistically simulate the actual wrapping structure of armored steel strips on cables. In actual cables, the wrapping of armored steel strips involves complex situations such as gaps and overlaps. The Epstein square method, due to the fixed sample size requirement, completely ignores these key factors, leading to significant deviations between the test results and actual conditions, making it difficult to accurately reflect the shielding performance of armored steel strips in real-world applications. The shielded room method also has many limitations. The equipment required is bulky, occupying a large amount of space and being expensive, representing a significant expense for enterprises. More importantly, its testing process is complex and lengthy, requiring considerable time and effort at each stage, from equipment preparation and sample installation to test data acquisition and analysis. This makes this method unsuitable for the rapid testing needs in production processes, severely limiting its application in modern industrial environments that prioritize high efficiency.

[0005] In summary, existing technologies generally suffer from three major shortcomings. First, regarding configuration distortion, they cannot effectively simulate the actual wrapping shape of the armored steel tape on the cable. Key parameters such as gaps and overlap rates are not reflected in traditional testing methods, leading to a disconnect between test results and actual applications. Second, regarding operating condition mismatch, test conditions are mostly static or low-frequency, while cables actually operate in a high-frequency AC interference environment. This difference makes it impossible for test results to accurately reflect the cable's performance under actual operating conditions. Third, regarding neglecting temperature rise, the performance changes of magnetic materials due to temperature rise under high current conditions, i.e., the thermal degradation effect, are not considered. This further reduces the accuracy of test results, making it difficult to meet the requirements for high-precision evaluation of signal cable shielding performance. Summary of the Invention

[0006] To address the technical problems in existing technologies, such as distorted configuration making it difficult to simulate the actual wrapping shape of armored steel tape, mismatch between operating conditions and actual high-frequency AC interference environments, and the limitation of test results accuracy and inability to achieve rapid production testing due to neglecting temperature rise and thermal degradation effects, this invention provides a testing device for rapidly evaluating the shielding performance of steel tape in cables. It sets a fixed simulated electric field interference environment for the steel tape and incorporates a cooling circulation system that effectively removes the heat generated by the sample due to high current induction during the test, thereby effectively suppressing sample temperature rise. This significantly reduces test data errors caused by sample temperature rise, fundamentally minimizing such errors and enabling accurate evaluation of the electromagnetic shielding performance of cables.

[0007] To achieve the above objectives, the present invention provides the following technical solution.

[0008] In a first aspect, the present invention provides a testing device for rapidly evaluating the shielding performance of steel tape in cables, comprising: a power supply, a copper busbar, a copper rod, a measuring loop, and a cooling circulation system; the copper rod is connected to the power supply through the copper busbar; the measuring loop is disposed on the outside of the copper rod; and the cooling circulation system is disposed inside the copper rod.

[0009] As a further improvement of the present invention, the copper rod is a hollow copper rod.

[0010] As a further improvement of the present invention, the cooling circulation system includes a coolant pipe, a coolant channel inlet, and a coolant channel outlet; the coolant pipe is disposed in the hollow area inside the copper rod.

[0011] As a further improvement of the present invention, the copper busbar includes a first copper busbar and a second copper busbar; one end of the first copper busbar is connected to one end of the copper rod, and one end of the second copper busbar is connected to the other end of the copper rod; the other end of the first copper busbar and the other end of the second copper busbar are connected to the power supply.

[0012] As a further improvement of the present invention, a steel strip sample to be tested is arranged around the copper rod.

[0013] As a further improvement of the present invention, the two ends of the measurement loop are connected to the voltage data measurement device.

[0014] As a further improvement of the present invention, the outer surface of the copper rod is provided with a groove, and the measuring loop is disposed in the groove.

[0015] As a further improvement of the present invention, the surface of the copper rod is coated with a polyester coating.

[0016] As a further improvement of the present invention, the power supply includes a high current source and a current measurement unit.

[0017] Secondly, the present invention provides a test method for rapidly evaluating the shielding performance of steel tape for cables, comprising: The steel strip sample to be tested is fixed on a copper rod with the actual cable production wrapping configuration; then coolant is injected into the cooling circulation system so that the steel strip sample to be tested meets the test temperature requirements. Turn on the power and apply current to the measuring copper rod through the copper busbar; The current I flowing through the copper rod is tested; the induced electromotive force V generated on the test line by the residual alternating magnetic field after being shielded by the steel strip is measured; based on the current I and the electromotive force V, the shielding performance coefficient of the steel strip under the configuration is calculated.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This device constructs a shielding performance evaluation platform that highly simulates real-world operating conditions, offers controllable testing accuracy, and is stable and reliable. Firstly, it fundamentally solves the long-standing technical bottleneck in this field—the problem of "configuration distortion." By fixing the steel strip sample to be tested strictly according to the actual cable production wrapping parameters (including gap and overlap rate) around a specially designed hollow copper rod, it ensures a high degree of consistency between the test configuration and the actual service form of the cable armor steel strip. This allows the evaluation results to accurately reflect the shielding effectiveness of the steel strip in specific application scenarios. Secondly, the device applies a high-precision, high-current source to the copper rod with an alternating current of a specific frequency and amplitude, generating an alternating magnetic field around the copper rod with controllable intensity and adjustable frequency. This accurately reproduces the high-frequency AC interference electromagnetic field environment encountered by the cable in actual operation, effectively overcoming the drawbacks of "operating condition mismatch" and providing accurate excitation conditions for evaluating the shielding performance of the steel strip under real electromagnetic interference. Thirdly, it addresses the critical factor that significantly affects testing accuracy: the sample temperature rise caused by high-current induction during the test and the resulting "thermal decay effect."

[0019] Furthermore, this device integrates a highly efficient cooling circulation system within the copper rod, which serves as both the magnetic field generator and heat source. Through continuous, constant-temperature circulation of the cooling medium, it rapidly and uniformly removes the large amount of Joule heat generated during the experiment, achieving precise temperature control of the copper rod and the steel strip sample wrapped around it. This minimizes the temperature rise of the testing system, ensuring the test is conducted under near-constant temperature conditions. This not only significantly reduces measurement errors caused by temperature variations in the material's electromagnetic parameters, but also significantly improves the accuracy, repeatability, and reliability of the test data. Furthermore, it enables stable testing under long-term, high-current conditions, providing a foundation for in-depth research into the shielding properties of materials. Moreover, this device integrates multiple functional modules such as magnetic field excitation, sample fixation, temperature control, signal acquisition, and data processing. The device is highly integrated, and through its built-in data processing unit (such as a programmable microcontroller integrated with a data acquisition card), it can synchronously acquire loop current and induced electromotive force in real time, and automatically calculate and output shielding performance coefficients. This achieves full automation and speed in the process from applying interference and signal acquisition to result analysis, greatly improving testing efficiency and meeting the urgent need for rapid testing on the production site. It provides an immediate and effective feedback means for the quality control and process optimization of cable products. Finally, the device has a scientific and reasonable overall design, is easy to operate, and has a wide range of applications. It can not only be used to evaluate the shielding effectiveness of steel strips of different specifications and materials, but also to study the impact of different wrapping process parameters (such as gap, overlap rate, etc.) on the final shielding effect, providing a powerful experimental tool and data support for the electromagnetic compatibility design of cables. Attached Figure Description

[0020] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the testing device of the present invention; Figure 2 This is a schematic diagram illustrating the shielding performance testing principle of the present invention. Figure 3 The shielding capacity coefficient of steel strip A; Figure 4 The shielding capacity coefficient of steel strip B.

[0021] In the diagram, 1 is the power supply; 21 is the first copper busbar; 22 is the second copper busbar; 3 is the copper rod; 4 is the steel strip sample to be tested; 5 is the measurement loop; 6 is the voltage data measuring device; 71 is the coolant channel inlet; and 72 is the coolant channel outlet. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] To address the technical problems in existing technologies, such as configuration distortion making it difficult to simulate the actual wrapping shape of armored steel tape, operational condition mismatch not matching the actual high-frequency AC interference environment, and limited accuracy of test results due to neglecting temperature rise leading to thermal degradation effects, and the inability to achieve rapid production testing, this invention provides a testing device for rapidly evaluating the shielding performance of steel tape used in cables, such as... Figure 1 As shown, it includes power supply 1, copper busbar, copper rod 3, measuring loop 5 and cooling circulation system.

[0025] A copper busbar is connected to the copper rod 3. The copper busbar includes a first copper busbar 21 and a second copper busbar 22. One end of the first copper busbar 21 is connected to one end of the copper rod 3, and one end of the second copper busbar 22 is connected to the other end of the copper rod 3. The other ends of the first copper busbar 21 and the second copper busbar 22 are connected to the power supply 1. The copper rod 3 is a hollow copper rod with an internal cooling circulation system. The cooling circulation system includes coolant pipes, a coolant channel inlet 71, and a coolant channel outlet 72. The coolant pipes are located inside the copper rod 3. A measuring loop 5 is installed on the copper rod 3, and both ends of the measuring loop 5 are connected to a voltage data measuring device 6.

[0026] Power supply 1 includes a high current source and a current measurement unit for providing and precisely controlling the test current, a first copper busbar 21 and a second copper busbar 22 for providing and precisely controlling the test current.

[0027] The surface of the copper rod 3 is coated with a polyester layer for insulation. Grooves are formed on the outer surface of the copper rod 3, and the measuring loop 5 is placed within these grooves to simulate a cable core and generate an alternating magnetic field. A power supply 1 powers the copper rod 3. An internal cooling circulation system circulates the cooling medium to stabilize the steel strip sample 4 under test. The steel strip sample is wrapped and fixed around the copper rod 3 with a preset gap and overlap rate. A voltage data measuring device 6 measures the induced electromotive force on the steel strip sample 4. The voltage data measuring device 6 includes a data processing unit for calculating the magnetic shielding performance coefficient of the steel strip sample 4 based on the induced electromotive force and the current in the copper rod 3. The data processing unit is a programmable microcontroller with an integrated current and voltage acquisition card, capable of calculating and displaying the shielding effectiveness in real time.

[0028] The cooling circulation system is set in the copper rod 3. The copper rod 3 with internal integrated cooling channels serves as the magnetic field generator and heat sink. The constant temperature circulation of coolant in the cooling circulation system solves the problem of temperature rise in high current testing and ensures that the test is carried out under constant temperature conditions. This is the core of improving accuracy.

[0029] The hollow copper rod 3 not only serves as a current carrier and magnetic field generator, but also integrates a highly efficient cooling circulation system. This cooling system includes coolant pipes, a coolant inlet 71, and a coolant outlet 72 arranged inside the copper rod 3, enabling continuous directional circulation of the cooling medium. The outer surface of the copper rod 3 is covered with a uniform polyester insulating coating to ensure its electrical isolation. Simultaneously, its surface has dedicated grooves for embedding the measurement loop 5. This structural design ensures accurate positioning of the measurement loop and helps simulate the spatial distribution characteristics of the electromagnetic field in a real cable. The power supply system 1 uses a high-precision, high-current source and integrates a current measurement unit, capable of outputting and precisely controlling the test current flowing through the copper rod 3 in real time according to test requirements, thereby generating a high-frequency alternating magnetic field around the copper rod that conforms to actual working conditions. During the test, the steel strip sample 4 to be tested is wrapped and fixed around the copper rod 3 according to a preset gap width and overlap rate to simulate its structural morphology in a real cable. Measurement loop 5 is arranged in a groove on the surface of the copper rod, and its output end is connected to a high-precision voltage data measurement device 6 to capture the induced electromotive force generated on the steel strip sample by the alternating magnetic field. The voltage data measurement device 6 integrates a high-performance data processing unit, which typically uses a programmable microcontroller system equipped with a current-voltage synchronous acquisition card, providing real-time data acquisition, calculation, and display functions. Based on the measured induced electromotive force and the known current value of the copper rod, the data processing unit can quickly calculate the core parameter reflecting the shielding performance of the steel strip—the magnetic shielding performance coefficient—thereby achieving a quantitative evaluation of its shielding effectiveness.

[0030] This device employs a hollow copper rod 3 with a built-in integrated cooling channel, which combines magnetic field excitation and active heat dissipation. Through constant-temperature circulation of the coolant, it efficiently removes Joule heat generated in the copper rod and steel strip samples due to high current flow, ensuring the test system remains at a constant or near-constant temperature. This effectively suppresses electromagnetic performance degradation caused by sample temperature rise (i.e., the "thermal decay effect"), significantly improving the accuracy and repeatability of test data. Therefore, it effectively overcomes the shortcomings of existing test methods in terms of configuration simulation realism, electromagnetic environment matching, and temperature rise control. This device provides a stable and controllable simulated interference electric and magnetic field environment for the steel strip samples. Combined with the built-in cooling circulation system, it fundamentally reduces the impact of temperature rise on test results, enabling accurate and rapid evaluation of the shielding performance of cable armor steel strips under actual wrapping configurations. This provides reliable experimental methods and data support for optimizing cable design and manufacturing processes.

[0031] In summary, this invention provides a testing device for rapidly evaluating the shielding performance of steel tape in signal cables. This addresses the challenge of existing technologies being unable to accurately test the shielding performance of cables under simulated actual wrapping structures. The core objective of this device is to accurately and rapidly test the shielding performance coefficient of steel tape in cable armor configurations, thereby evaluating the shielding performance of cables under this configuration. This device sets a fixed simulated electric field interference environment for the steel tape and incorporates a cooling circulation system. This effectively removes the heat generated by the sample due to high current induction during the test, thus effectively suppressing sample temperature rise. This significantly reduces test data errors caused by sample temperature rise, fundamentally minimizing such errors and achieving accurate evaluation of the electromagnetic shielding performance of cables.

[0032] The second objective of this invention is to provide a rapid test method for evaluating the shielding performance of steel tape used in cables, comprising the following steps: The steel strip sample 4 to be tested is fixed on the copper rod 3 with the actual cable production wrapping configuration; coolant is injected into the coolant channel inside the copper rod 3 through the coolant channel inlet 71 to ensure that the steel strip sample 4 to be tested has a stable test temperature. Measure the current I flowing through copper rod 3; measure the induced electromotive force V generated on the test line by the residual alternating magnetic field after being shielded by the steel strip; calculate the shielding performance coefficient of the steel strip under the configuration based on the current I and the electromotive force V.

[0033] The groove on the outside of the copper rod 3 can be replaced according to the different widths of the steel strip.

[0034] The steel strip sample 4 to be tested is precisely fixed to the outer surface of the hollow copper rod 3 according to the wrapping process parameters used in actual cable production. During the wrapping process, the gap width and overlap rate of the steel strip must be strictly controlled to ensure that its geometric configuration is consistent with the actual cable armor structure, thus realistically simulating the electromagnetic shielding environment during cable operation. A constant-temperature cooling medium is injected into the integrated coolant channel inside the copper rod 3 through the coolant channel inlet 71, starting the cooling circulation system. The coolant continuously circulates within the closed channel, effectively removing the Joule heat generated by the large current induction during the test, maintaining the steel strip sample 4 and the entire test system within a stable temperature range, thereby suppressing the influence of thermal decay on the electromagnetic properties of the material and ensuring the accuracy and repeatability of the test data. Power supply 1 is turned on, and an alternating current of a set amplitude and frequency is applied to the copper rod 3. This current excites an alternating magnetic field around the copper rod 3, simulating the high-frequency electromagnetic interference environment experienced by the cable under actual operating conditions. The current measurement unit monitors and records the current value I flowing through the copper rod in real time, serving as a reference parameter for subsequent shielding effectiveness calculations. A measurement loop 5 is arranged within a pre-set groove on the surface of the copper rod 3 to capture the residual alternating magnetic field after shielding by the steel strip sample 4. Both ends of this loop are connected to a high-precision voltage data measurement device 6 to measure the electromotive force signal V induced by the residual magnetic field. During the measurement process, the synchronization and anti-interference capabilities of the signal acquisition must be ensured to accurately reflect the shielding effect of the steel strip under actual wrapping conditions. Based on the measured current value I and the induced electromotive force V, combined with the system calibration parameters, the data processing unit integrated in the voltage data measurement device 6 calculates the magnetic shielding performance coefficient of the steel strip sample in real time. This coefficient, as a key indicator for evaluating the shielding effectiveness of the steel strip, can be directly used to quantitatively compare the electromagnetic shielding capabilities of steel strips with different wrapping configurations and materials. The test results can be displayed in real time through a human-machine interface or output to an external system for further analysis and storage. This method, by combining simulated real wrapping configurations, active temperature control, and high-precision electromagnetic measurement, achieves a rapid and accurate evaluation of the shielding performance of cable steel strips, providing a reliable basis for optimizing cable design and manufacturing processes.

[0035] The present invention will be further explained and illustrated below with reference to specific embodiments.

[0036] Example This invention provides a testing device for rapidly evaluating the shielding performance of steel tape used in cables. The device uses a cylinder with a diameter of 20mm ± 0.1mm and a length of 1000mm ± 1mm. The groove is a cylindrical groove with a longitudinal diameter of 2.10mm ± 0.04mm along the copper rod, forming a copper rod 3 with an external groove. The copper busbar has a thickness of 5mm, a width of 10mm, and a length of 20mm. The voltage data measurement device 6 uses a clamp-on ammeter and a precision digital millivoltmeter. A cooling circulation system is included, which can stably control the sample temperature at 20℃ ± 5℃.

[0037] like Figure 2 As shown, the principle of this application is as follows: The output high-current AC current (high-current generator, capable of generating a high-current device with a frequency of 50Hz and a maximum current of 500A) is applied to the copper rod 3 through the first copper busbar 21 and the second copper busbar 22, thereby generating a strong alternating magnetic field. This is monitored and displayed in real time by a high-precision clamp meter. The steel strip sample to be tested is placed in the groove of the copper rod in the same wrapping manner as an actual cable (including gaps or overlaps). The alternating magnetic field passes through the steel strip sample, and its intensity is attenuated due to the magnetic shielding effect of the steel strip. The induced electromotive force generated by testing at both ends of the measurement loop 5, where the steel strip sample 4 is placed, is read by the precision voltage measuring device set in the voltage data measuring device 5, and this value, along with the current value in the copper rod, is substituted into the following formula:

[0038] Where: S is the magnetic permeability. D is the diameter of the wrapped steel strip layer, in mm; V is the induced voltage, in mV. S is the frequency of the alternating magnetic field, in Hz; S is the cross-sectional area of ​​the steel strip enclosed by the measurement loop, in m2; I is the current passing through the center of the steel strip, in A.

[0039] The shielding performance coefficient for this specific steel strip configuration can be accurately calculated using the above formula. This coefficient directly reflects the actual shielding effectiveness provided by this type of steel strip wrapping method for the cable.

[0040] Through numerous experiments, the shielding capability coefficients and interference current curves of the two types of steel strips are presented as follows: Figure 3 and Figure 4 As shown, for cables produced by these two types of steel strips with the same structure, at 50Hz and 30V / km to 200V / km, the maximum ideal shielding coefficient of the first type is 0.06, and the maximum ideal shielding coefficient of the second type is 0.18. Obviously, the ideal shielding coefficient with the higher shielding capability coefficient is better in the test, which is consistent with the test results of this invention.

[0041] The significant innovation of this solution lies in its use of an external cooling source to perform constant-temperature cooling circulation within the copper rod 3, thus actively cooling both the copper rod 3 and the steel strip sample 4 under test. This not only eliminates the temperature rise error caused by high-current testing but also stabilizes the sample temperature at the set value, significantly improving the accuracy and repeatability of the test data. This device can directly simulate the actual armor structure of the cable, ensuring that the test results accurately reflect the true shielding performance of the steel strip on the cable. The fixing structure of the test sample (steel strip) adopts a gap-wrapped armor form completely consistent with the cable manufacturing process, and the structural parameters (different widths, thicknesses, gaps, and overlap rates) can be flexibly adjusted for rapid, multiple tests. This structural design is crucial for ensuring the authenticity of the test results. Secondly, the built-in cooling system eliminates temperature rise errors, and combined with high-precision digital ammeters and voltmeters, ensures data accuracy. Furthermore, the sample fixing device design allows for rapid adjustment and fixing of the steel strip's overlap rate and gap, enabling efficient testing of various structures. Sample preparation is simple, and the testing process is fast, making it ideal for rapid screening and quality monitoring on production lines.

[0042] Compared to traditional inductive testing methods, this method represents a significant leap forward in terms of sample adaptability, the realism of operational condition simulation, and the reliability of final data. The microcontroller serves not only as a display but also as the control core. The programmable microcontroller integrates a data acquisition card to simultaneously acquire current and voltage signals from the voltage measurement device. Based on a built-in algorithm, it calculates and displays parameters such as the shielding performance coefficient in real time, and can also plot the shielding performance coefficient-induced voltage curve, greatly improving testing efficiency and automation while avoiding human calculation errors.

[0043] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

[0044] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection of the present invention as defined by the submitted claims.

Claims

1. A testing device for rapidly evaluating the shielding performance of steel tape used in cables, characterized in that, include: Power supply (1), copper busbar, copper rod (3), measuring loop (5) and cooling circulation system; The copper rod (3) is connected to the power supply (1) through the copper busbar; The measuring loop (5) is located on the outside of the copper rod (3); The cooling circulation system is located inside the copper rod (3).

2. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 1, characterized in that, The copper rod (3) is a hollow copper rod.

3. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 2, characterized in that, The cooling circulation system includes a coolant pipe, a coolant channel inlet (71), and a coolant channel outlet (72). The coolant pipe is located in the hollow area inside the copper rod (3).

4. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 1, characterized in that, The copper busbar includes a first copper busbar (21) and a second copper busbar (22). One end of the first copper busbar (21) is connected to one end of the copper rod (3), and one end of the second copper busbar (22) is connected to the other end of the copper rod (3); The other end of the first copper busbar (21) and the other end of the second copper busbar (22) are connected to the power supply (1).

5. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 1, characterized in that, The copper rod (3) is surrounded by a steel strip sample (4) to be tested.

6. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 1, characterized in that, The two ends of the measurement loop (5) are connected to the voltage data measuring device (6).

7. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 1, characterized in that, The outer surface of the copper rod (3) is provided with a groove, and the measuring loop (5) is set in the groove.

8. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 1, characterized in that, The surface of the copper rod (3) is coated with a polyester coating.

9. The testing device for rapidly evaluating the shielding performance of steel tape for cables according to claim 1, characterized in that, The power supply (1) includes a high current source and a current measurement unit.

10. A test method for rapidly evaluating the shielding performance of steel tape for cables according to any one of claims 1-9, characterized in that, include: The steel strip sample (4) to be tested is fixed on the copper rod (3) with the wrapping configuration of the actual cable production. Then coolant is injected into the cooling circulation system so that the steel strip sample (4) to be tested meets the test temperature requirements; Turn on the power supply (1) and apply current to the measuring copper rod (3) through the copper busbar; Test the current value I flowing through the copper rod (3); measure the induced electromotive force V generated on the test line by the residual alternating magnetic field after being shielded by the steel strip; The shielding performance coefficient of the steel strip under the given configuration is calculated based on the current I and the electromotive force V.

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