A method for improving performance of a current sensor based on a magnetic coupling agent

Abstract

The application relates to a current sensor performance improvement method based on a magnetic coupling agent, which realizes the wide adjustment of key mechanical characteristics such as paste hardness and temperature stability by accurately setting key mechanical performance indexes of the magnetic coupling agent paste and finely regulating based on specific conditions of an actual application environment and sensor magnetic circuit characteristic types. Meanwhile, an environment adaptability evaluation strategy based on two-dimensional material science characterization technology is introduced to realize real-time monitoring and optimization of paste component distribution ratios, so that effective suppression of magnetic circuit noise and efficient improvement of the overall performance of the current sensor are ensured. The reduction of the noise directly improves the measurement accuracy of the current sensor, so that the measurement of the current parameter is more accurate and reliable in a complex and changeable power system environment.

Description

TECHNICAL FIELD

[0001] The application relates to a current sensor performance improvement method based on a magnetic coupling agent. BACKGROUND

[0002] In the safe and stable operation of a power system, accurate and real-time measurement of current parameters in the circuit is crucial. With the rapid development of smart grids and power electronics technology, current sensors, as the core devices for monitoring current size and direction, play an indispensable role in automation equipment, smart grids, new energy vehicles and other fields. However, the precision and stability of current sensors directly affect the operation efficiency and safety of the entire power system, especially in complex and variable application scenarios such as high voltage or low voltage, the performance requirements for sensors are more stringent.

[0003] Although existing current sensor technology meets the basic needs of the power system to some extent, it still faces many challenges in actual application. On the one hand, the internal magnetic circuit closure stability of the current sensor will gradually decrease during long-term use due to frequent opening and closing and wear, resulting in poor magnetic circuit contact and generation of magnetic resistance variation noise. This magnetic resistance variation noise not only increases the uncertainty of measurement, but also seriously reduces the measurement accuracy and stability of the current sensor. On the other hand, different application scenarios have different performance requirements for current sensors, and traditional current sensors often cannot meet the high precision and high stability requirements under different environmental conditions at the same time.

[0004] In order to improve the measurement accuracy and stability of the current sensor, existing technologies mainly explore sensor structure design, material optimization and signal processing. However, these methods have limited effect and high cost in solving the problem of poor magnetic circuit contact and magnetic resistance variation noise. For example, improving the sensor structure design to enhance the stability of the magnetic circuit can alleviate the problem to some extent, but often accompanied by increased cost and complexity; while material optimization is often limited by the inherent properties of the material, making it difficult to achieve all-round performance improvement.

[0005] In summary, the existing technology has obvious shortcomings in solving the problem of poor magnetic circuit contact and magnetic resistance variation noise of the current sensor, and an innovative solution is needed to effectively suppress the magnetic resistance variation noise caused by poor magnetic circuit contact, thereby improving the measurement accuracy and stability of the current sensor. SUMMARY

[0006] The purpose of the present application is to overcome the shortcomings and deficiencies of the prior art, and to provide a current sensor performance improvement method based on a magnetic coupling agent, comprising the following steps:

[0007] Step one, according to the environmental and current sensor species characteristics, the mechanical performance strength of the coupling agent paste is calculated,

[0008] ;

[0009] Wherein, Q is the mechanical performance strength, η is the efficiency adjustment coefficient, 1 is the initial magnetic core permeability, 2 is the maximum magnetic core permeability, B s is the saturation magnetic flux density, S is the cross-sectional area of the magnetic core, H c is the coercive force, T is the environmental temperature, T C is the Curie temperature, R is the environmental humidity, A is the amplitude of vibration

[0010] Step two, magnetic coupling agent preparation: the magnetic coupling agent includes base oil, thickening agent, conductive filler, and the specific mechanical performance adjustment filler ratio is determined through experiment using dichotomy, and finally the magnetic coupling agent is prepared through mechanical stirring;

[0011] Step three, coupling agent trial and effect evaluation: the prepared coupling agent is applied to the current sensor magnetic circuit contact surface, and the weather resistance, corrosion resistance, texture hardness, temperature stability and noise suppression effect of the coupling agent in actual use are evaluated, and the mechanical performance strength error Δe is calculated, which is between 0~1, which can directly reflect the closeness of the actual performance and the expected target of the coupling agent;

[0012] Step four, coupling agent mechanical property compensation: the mechanical performance strength error Δe obtained in step three is added to the mechanical performance strength formula established in step one, and the final coupling agent paste mechanical performance strength Q is obtained,

[0013] ;

[0014] Wherein is the adjustment coefficient, is the mechanical performance strength after compensation;

[0015] According to the mechanical performance strength after compensation, the coupling agent paste formula is configured through experiment, and the proportion of the corresponding formula components is found.

[0016] In step two, based on the excellent high temperature resistance and excellent corrosion resistance of silicone oil, silicone oil is selected as the base oil. In order to improve the performance of the base oil, a thickening agent is introduced for thickening treatment. The thickening agent refers to a substance that can increase the viscosity of a liquid, making it become a semi-solid or solid state. In the present application, the thickening agent needs to have good heat resistance and chemical stability, so inorganic thickening agent is preferably used, such as fumed silica.

[0017] In step two, the conductive filler is one or more of ceramic ferrite, graphite, and graphene.

[0018] In step three, the prepared coupling agent is carefully applied to the tiny and uneven gaps between the device and the circuit, especially those hard-to-reach or easily overlooked areas such as the tiny cracks at the edges of the device or the buckle parts of the current sensor itself. These areas are often the potential sources of vibration noise and current noise, which can interfere with the accurate measurement of the sensor.

[0019] In step three, the evaluation of the weather resistance and corrosion resistance of the coupling agent in actual use is carried out by referring to the actual environment for accelerated aging operation, detecting the degradation speed of the magnetic circuit contact surface from the two-dimensional material perspective, and using electron microscopy, infrared spectroscopy, Raman spectroscopy, etc. characterization means.

[0020] In step three, the texture softness of the coupling agent is evaluated by testing the cone penetration. Cone penetration is a key indicator of the softness of the magnetic coupling agent, and its suitability is directly related to the effectiveness of the coupling agent. Using the standard method, release the cone and cone rod assembly from the cone penetration meter at room temperature, record the penetration depth after 5 seconds of falling, and repeat the test three times to take the average value. By precisely controlling the cone penetration, it ensures that the coupling agent is neither too soft to cause loss nor too hard to affect the uniformity of spreading, thereby ensuring weather resistance while achieving the best magnetic coupling effect.

[0021] In step three, the temperature stability of the coupling agent is tested by the drop point experiment. Drop point testing is an important means of evaluating the high temperature resistance of the magnetic coupling agent. In the drop point tester, the coupling agent sample is placed in an environment that is constantly heated until the moment when the oil drops are observed, and the temperature at that time is recorded as the drop point. The drop point directly reflects the stability of the coupling agent in a high temperature environment and is an important basis for selecting a coupling agent suitable for extreme temperature conditions. Through drop point testing, it ensures that the coupling agent can maintain its physical and chemical properties stable at high temperatures, providing a strong guarantee for the long-term stable operation of the system.

[0022] In step three, the same current sensor is used to test the current on the same circuit, with the same current size, one using the coupling agent and one not using it. The effect of suppressing magnetic circuit noise can be directly observed through the oscilloscope.

[0023] The application provides a current sensor performance improvement method based on a magnetic coupling agent. By accurately setting the key mechanical performance indicators of the magnetic coupling agent paste, and based on the specific conditions of the actual application environment and the type of sensor magnetic circuit characteristics, the paste hardness, temperature stability and other key mechanical characteristics are widely adjusted. At the same time, the environmental adaptability evaluation strategy based on two-dimensional material science characterization technology is introduced to realize real-time monitoring and optimization of the paste component ratio, ensuring effective suppression of magnetic circuit noise and efficient improvement of the overall performance of the current sensor. This reduction in noise directly improves the measurement accuracy of the current sensor, making the measurement of current parameters more accurate and reliable in complex and variable power system environments. Since the magnetic coupling agent paste can be finely adjusted according to the actual application environment and the characteristics of the sensor magnetic circuit, it can better adapt to various working environments, including high voltage, low voltage, high temperature, low temperature and other extreme conditions. This adaptability not only prolongs the service life of the sensor, but also significantly improves its long-term stability.

[0024] Compared with the traditional method of improving performance by improving sensor structure design or material optimization, the magnetic coupling agent technology of the application does not require complex modification of the sensor or replacement of expensive materials. This not only reduces costs, but also simplifies the implementation process, making the technology easier to promote and apply. The introduction of the magnetic coupling agent effect evaluation and mechanical performance strength compensation strategy enables the component ratio of the magnetic coupling agent paste to be monitored and optimized in real time according to the actual working environment and different types of current sensors. This dynamic feedback compensation mechanism ensures that the magnetic circuit noise is effectively suppressed in different application environments, thereby improving the environmental adaptability and measurement accuracy of most current sensors.

[0025] In summary, the coupling type high-precision current sensing magnetic circuit noise suppression method of the application has significant beneficial effects in improving the measurement accuracy and stability of current sensors, reducing costs and complexity, and improving environmental adaptability, providing an important guarantee for the safe and stable operation of power systems. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0027] Figure 1 The method provided by the application is shown in the flowchart;

[0028] Figure 2The relationship between the drop point and the content of graphene in one embodiment of the present application;

[0029] Figure 3 The relationship between the drop point and the content of compound graphene in one embodiment of the present application;

[0030] Figure 4 The noise reduction effect comparison chart in one embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0032] The inductive power pickup efficiency improving method described in the present application is divided into four steps: environment and current sensor type characteristic determination, magnetic coupling agent preparation and mechanical property adjustment, coupling agent trial and effect evaluation, coupling agent mechanical property compensation

[0033] Step one, environment and current sensor magnetic core material characteristic determination

[0034] The magnetic core material characteristics and environmental characteristics of the current sensor will affect the magnetic coupling effect, so the performance of the magnetic coupling agent needs to be differentiated. The coupling agent paste should have excellent mechanical stability and temperature stability to resist environmental challenges. However, this requirement for enhanced stability often comes with a potential reduction in the contact efficiency of the coupling agent with the magnetic core, which may in turn cause an increase in magnetic resistance. Therefore, for specific application scenarios, it is particularly important to accurately balance and optimize the performance parameters of the magnetic coupling agent, and to find a range of values that can meet the stability requirements without sacrificing contact efficiency too much. At the same time, considering the differences in the permeability, saturation characteristics and other physical properties of different magnetic core materials, this optimization process also needs to take into account the characteristics of the magnetic core material to achieve the best magnetic coupling effect.

[0035] A formula for mechanical performance strength is established, including initial magnetic core permeability, maximum magnetic core permeability, saturation magnetic induction intensity, magnetic core cross-sectional area, coercive force, Curie temperature, environmental temperature, and fluctuation amplitude parameters, which can be used to preliminarily calculate the mechanical performance strength of the coupling agent paste. It is used for the characteristic compensation of the performance strength of the coupling agent.

[0036]

[0037] where Q is the mechanical performance strength, η is the efficiency adjustment coefficient, 1 is the initial magnetic core permeability, 2 is the maximum magnetic core permeability, B s is the saturation magnetic flux density, S is the magnetic core cross-sectional area, H c is the coercive force, T is the environmental temperature, T CTc is the Curie temperature, R is the ambient humidity, and A is the amplitude of the oscillation.

[0038] Step two, magnetic coupling agent preparation

[0039] The magnetic coupling agent designed to suppress current sensor noise includes base oil, thickening agent, and conductive filler. The base oil needs to have excellent high-temperature resistance and excellent corrosion resistance, for example, silicon oil can be selected as the core base oil. The thickening agent is introduced for thickening treatment, and the conductive filler can be ceramic ferrite (the material is synthesized by precise ceramic process, and the core components are iron oxide, nickel oxide, and zinc oxide), graphite, and graphene, etc. high-efficiency conductive filler.

[0040] The magnetic coupling agent is established by experiment, and the ordered data set is searched in the ordered data set using bisection method (by continuously dividing the search range of the problem into two, gradually narrowing the search range, and finally finding the solution or approximate solution of the problem), to determine the specific mechanical performance adjustment filler ratio, and finally to be made into a magnetic coupling agent by mechanical stirring.

[0041] The experiment includes the performance test of different coupling agent formula proportions. In some embodiments of the present application, the following single performance test is included:

[0042] (1) Weather resistance and corrosion resistance: accelerated aging operation is carried out according to the actual environment, and the deterioration speed of the magnetic circuit contact surface is detected from the two-dimensional material angle, such as using electron microscope, infrared spectrum, Raman spectrum, etc. characterization means.

[0043] (2) Cone penetration: as a key indicator to measure the softness and hardness of the magnetic coupling agent, its suitability is directly related to the use effect of the coupling agent. Adopt standard method, release the cone and cone rod assembly from the cone penetration gauge at room temperature, record the penetration depth after 5 seconds of cone falling, and repeat the test three times to take the average value. By accurately controlling the cone penetration, it is ensured that the coupling agent is neither too soft to cause loss, nor too hard to affect the uniformity of spreading, so as to realize the best magnetic coupling effect while ensuring the weather resistance.

[0044] It can be found that with the increase of the filler content, the cone penetration of the magnetic coupling agent shows a significant downward trend. From the initial 97.8 to 71.4, the drop is as high as 26.4%.

[0045] It can be found that, under the premise of keeping the thickening agent and silicone oil base unchanged, the particle size of the filler becomes the key factor affecting the size of the cone penetration. The smaller the particle size of the filler, the larger the specific surface area, and the more significant the decrease in the cone penetration. This phenomenon fully shows that the particle size and specific surface area of the filler material have a significant regulating effect on the change trend of the cone penetration of the magnetic coupling agent.

[0046] If the cone penetration is too high (i.e., greater than 90), it means that the viscosity of the magnetic coupling agent is low, and in actual outdoor application, the magnetic coupling agent is prone to loss when applied to the magnetic coupling interface, which seriously affects the high-temperature resistance performance of the magnetic coupling agent and may cause the magnetic coupling agent to fail. On the contrary, if the state of the magnetic coupling agent is too hard (the cone penetration is less than 70), air bubbles and dryness are prone to occur during the application process, which causes poor contact of the magnetic coupling interface and increases the contact resistance, thereby damaging the connection quality of the magnetic coupling system. Therefore, accurately measuring and controlling the cone penetration of the magnetic coupling agent to an appropriate range is crucial to ensure its stable performance and efficient operation under various environmental conditions. The appropriate cone penetration can be regulated by changing the content or particle size of the filler.

[0047] (3) Temperature stability: drop point test is performed. Drop point test is an important means to evaluate the high-temperature resistance of the magnetic coupling agent. In the drop point tester, the coupling agent sample is placed in an environment that is constantly heated until the moment when oil droplets are observed, and the temperature at this moment is recorded as the drop point. The drop point directly reflects the stability of the coupling agent in a high-temperature environment and is an important basis for selecting a coupling agent suitable for extreme temperature conditions. Through drop point testing, the stability of the coupling agent in high-temperature environments is ensured, providing a strong guarantee for the long-term stable operation of the system.

[0048] The drop point can reflect the maximum use temperature of the magnetic coupling agent to some extent. The stronger the high-temperature resistance, the more stable the performance of the magnetic coupling agent in a high-temperature environment. When the magnetic coupling agent works at a temperature higher than its limit, oil and grease separation may occur, causing the magnetic coupling agent to fail. The factors affecting the drop point size mainly include the performance of the base oil, the performance of the thickening agent, the performance of the filler, and the control of the preparation process.

[0049] For example, in one embodiment of the present application, five kinds of magnetic coupling agents with different ceramic ferrite contents are prepared, and the high-temperature resistance performance of the five kinds of magnetic coupling agents is tested, and the test results are shown in Table 1.

[0050] Table 1 Relationship between drop point and ceramic ferrite content

[0051]

[0052] The drop point of the magnetic coupling agent mainly depends on the size of the cone penetration, the interaction of the thickener, the base oil and the filler. It is found that with the increase of the ceramic ferrite content, the drop point of the magnetic coupling agent first increases sharply, and then gradually decreases after tending to be stable. This is because when the ceramic ferrite content is 77% and the cone penetration is 95.4, the viscosity of the magnetic coupling agent is reduced, it is easy to flow, and the drop point is only 180℃. When the ceramic ferrite content begins to increase, the silicone oil and the thickener in the magnetic coupling agent interact with each other, the colloidal stability is increased, and better stability is shown. With the continuous increase of the ceramic ferrite content, the cone penetration is reduced, the grease begins to harden, the colloidal stability in the magnetic coupling agent is destroyed, and the drop point is reduced to 245℃.

[0053] For example, in an embodiment of the present application, five kinds of magnetic coupling agents with different graphene contents are prepared, and the high temperature resistance performance test is carried out on the five kinds of magnetic coupling agents, and the test results are shown in Table 2.

[0054] Table 2 Relationship between drop point and graphene content

[0055]

[0056] Figure 2 The drop point (℃) is related to the graphene content (wt%). The drop point of the magnetic coupling agent mainly depends on the size of the cone penetration, the interaction of the thickener, the base oil and the filler. It is found that with the increase of the graphene content, the drop point of the magnetic coupling agent increases sharply from 260℃ to 330℃, and then gradually decreases to 290℃ after tending to be stable. This is because when the graphene content is 3%, the cone penetration is 97.8, the viscosity in the magnetic coupling agent is low, and it is easy to flow. However, because the high temperature resistance performance of the silicone oil itself can reach 200℃, the van der Waals force in the graphene sheet layer is stronger than other materials, and the magnetic coupling agent is interacted with the thickener, so the high temperature resistance performance of the magnetic coupling agent is much higher than the standard requirement (200℃). With the continuous increase of the graphene content, the colloidal synergistic effect of the stable graphene, the phenyl silicone oil and the thickener makes the colloidal structure of the magnetic coupling agent more stable, and when the graphene content is 5%, the high temperature resistance performance reaches 330℃. With the continuous increase of the graphene content, the filler agglomeration is caused, the cone penetration begins to decrease, the magnetic coupling agent becomes hard, the internal fluidity begins to deteriorate, and the grease separation phenomenon is easy to occur in the high temperature environment, so the drop point is reduced to 290℃.

[0057] For example, in an embodiment of the present application, five kinds of magnetic coupling agents with different compounded graphene contents (1% of graphene is compounded and mixed with ceramic ferrite to obtain) are prepared, and the high temperature resistance performance test is carried out on the five kinds of magnetic coupling agents, and the test results are shown in Table 2.

[0058] Table 3 Relationship between drop point and content of compounded graphene

[0059]

[0060] Figure 3 The relationship curve of drop point (℃) and content of compounded graphene is shown in the figure. It is found that with the increase of the content of compounded graphene, the drop point of the magnetic coupling agent increases sharply from 250℃ to 314℃, and gradually tends to be stable, and then the drop point continues to increase to 325℃. This is because when the filler content is 69%, the cone penetration is 95.7, at this time the internal viscosity of the magnetic coupling agent is low and easy to flow. But because the high temperature resistance of the silicone oil itself can reach 200℃, the stable internal structure of the graphene and the synergistic effect of the thickening agent, when subjected to high temperature, the drop point of the magnetic coupling agent can reach 250℃. With the continuous increase of the content of graphene, the synergistic effect of the stable graphene, phenyl silicone oil and thickening agent colloid is continuously strengthened, so that the colloid structure of the magnetic coupling agent is more stable, when the filler content is 73%, the cone penetration is reduced to 82.7, which is the best viscosity range of the magnetic coupling agent, therefore, the drop point shows a trend of continuous increase.

[0061] Based on the above experimental results, it can be shown that by fine tuning the particle size of the filler and optimizing the cone penetration range, the drop point of the magnetic coupling agent can be significantly improved, thereby enhancing its high temperature resistance and overall performance stability in practical application.

[0062] (4) Effect of suppressing noise: the same current sensor is used to test the current on the same line, and the current size is set to be the same, one uses the coupling agent and the other does not use the coupling agent. The effect of suppressing the magnetic circuit noise can be directly observed by the oscilloscope, and the actual effect of the method is verified. Figure 4 The test results of an embodiment of the present application.

[0063] In some embodiments of the present application, 2μm ceramic ferrite, 1000 mesh graphite powder, nano graphene and compounded graphite and graphene are respectively used as fillers to prepare the magnetic coupling agent.

[0064] Step three, trial and effect evaluation of the magnetic coupling agent

[0065] The prepared coupling agent is applied to the contact surface of the current sensor magnetic circuit, and also carefully applied to the small and uneven gaps between the device and the line, especially the areas that are difficult to reach or easily ignored, such as small cracks at the edge of the device or the buckle part of the current sensor. These areas are often the potential source of vibration noise and current noise, and their existence may interfere with the accurate measurement of the sensor.

[0066] Similarly, various individual tests were completed, and the performance of the coupling agent was comprehensively evaluated. The mechanical strength error ∆e was calculated, and its value is between 0 and 1, which can intuitively reflect the degree to which the actual performance of the coupling agent is close to the expected target.

[0067] The calculation method for mechanical strength error ∆e is as follows:

[0068] Individual performance error = Actual test value - Expected target value;

[0069] The weighted average method is used to calculate the overall performance error;

[0070] The weighted average error value is calculated based on the importance and weight of each mechanical performance indicator. This can be achieved using the formula: Overall performance error = Σ(Individual performance error × Weight) / ΣWeight. To ensure that the mechanical performance strength error ∆e is between 0 and 1, it can be normalized by dividing the overall performance error by a suitable benchmark value. The benchmark value can be the maximum, minimum, or average of the expected target values, depending on the purpose and requirements of the evaluation.

[0071] The normalized mechanical strength error ∆e can be calculated using the formula: ∆e = Comprehensive performance error / Reference value.

[0072] Step 4: Compensation of the mechanical properties and strength of the coupling agent

[0073] Based on the evaluation results, mechanical property strength compensation can be performed on the coupling agent, and the coupling agent formulation can be further optimized to further improve its performance and meet a wider range of application needs. The obtained performance error is added to the established mechanical property strength formula to obtain the final mechanical property strength of the coupling agent paste.

[0074]

[0075] in To adjust the coefficient, To compensate for the mechanical strength.

[0076] Finally, based on the compensated mechanical properties, the proportions of the corresponding formulation components were determined through experimental preparation of the coupling agent paste formula.

[0077] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for improving the performance of a current sensor based on a magnetic coupling agent, characterized in that... Includes the following steps: Step 1: Based on the environmental conditions and the characteristics of the current sensor type, preliminarily calculate the mechanical properties and strength of the coupling agent paste. ； Where Q represents mechanical strength, and η is the efficiency adjustment coefficient. 1 represents the initial permeability of the magnetic core. 2 represents the maximum core permeability, B s Where S is the saturation magnetic flux density, S is the cross-sectional area of ​​the magnetic core, and H is the saturation magnetic flux density. c T represents coercivity, and T represents ambient temperature. C R is the Curie temperature, A is the ambient humidity, and A is the amplitude of the oscillation. Step 2, Preparation of magnetic coupling agent: The magnetic coupling agent includes base oil, thickener, and conductive filler. The specific mechanical properties are determined through experiments using the dichotomy method, and the filler ratio is adjusted. Finally, the magnetic coupling agent is prepared by mechanical stirring. Step 3: Coupling Agent Trial and Effect Evaluation: The prepared coupling agent is applied to the magnetic circuit contact surface of the current sensor. The weather resistance, corrosion resistance, texture hardness, temperature stability, and magnetic circuit noise suppression performance of the coupling agent in practical use are evaluated. The mechanical strength error is calculated. Its value is between 0 and 1, which can intuitively reflect the degree to which the actual performance of the coupling agent is close to the expected target; Step 4: Compensation for the mechanical properties of the coupling agent: This involves compensating for the mechanical strength error obtained in Step 3. Adding this to the mechanical property strength formula established in step one yields the final mechanical property strength of the coupling agent paste. ； in To adjust the coefficient, To compensate for the mechanical strength; Based on the compensated mechanical properties, the proportions of the corresponding formulation components were determined by experimentally configuring the coupling agent paste formula.

2. The method for improving the performance of a current sensor based on a magnetic coupling agent according to claim 1, characterized in that: In step two, the base oil is silicone oil.

3. The method for improving the performance of a current sensor based on a magnetic coupling agent according to claim 1, characterized in that: In step two, the conductive filler is one or more of ceramic ferrite, graphite, and graphene.

4. The method for improving the performance of a current sensor based on a magnetic coupling agent according to claim 1, characterized in that: In step three, the prepared coupling agent must be carefully applied to any tiny and uneven gaps that may exist between the device and the wiring.

5. The method for improving the performance of a current sensor based on a magnetic coupling agent according to claim 1, characterized in that: In step three, the specific process for evaluating the weather resistance and corrosion resistance of the coupling agent in actual use is as follows: accelerated aging is carried out with reference to the actual environment, and the deterioration rate of the magnetic circuit contact surface is detected from the perspective of two-dimensional materials.

6. The method for improving the performance of a current sensor based on a magnetic coupling agent according to claim 1, characterized in that: In step three, the texture and hardness of the coupling agent are evaluated by testing the cone penetration of the coupling agent.

7. The method for improving the performance of a current sensor based on a magnetic coupling agent according to claim 1, characterized in that: In step three, the temperature stability of the coupling agent is evaluated through a dropping point test.

8. The method for improving the performance of a current sensor based on a magnetic coupling agent according to claim 1, characterized in that: In step three, the same current sensor is used to test the current on the same line. The current magnitudes are set to be the same, one with a coupling agent and the other without. The effect of suppressing magnetic circuit noise can be seen visually through an oscilloscope.

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