Self-shielding anti-interference current transformer and its dynamic magnetic field compensation method

Abstract

The present invention provides a self-shielding anti-interference current transformer and its dynamic magnetic field compensation method. The external interference magnetic field data is detected in real time by the magnetic field sensing layer, providing a basis for the interference shielding of the magnetic field. Based on the external interference magnetic field data, the reverse magnetic field data is set to enable the main shielding winding to generate a reverse magnetic field, which is superimposed and cancelled with the interference magnetic field. Based on the cancellation situation of the external interference magnetic field data by the reverse magnetic field data, the auxiliary magnetic field data is set by the residual suppression layer for further magnetic field shielding, and the auxiliary shielding winding further eliminates high-frequency residual interference. Finally, 0-20 kHz broadband interference suppression is achieved, and the performance can be kept stable in the temperature range of -40°C to 120°C. By adopting a three-layer dynamic shielding layer, the dynamic interference problem in a complex electromagnetic environment is solved, and the measurement accuracy is improved to the 0.1% level.

Description

Technical Field

[0001] The present invention relates to the technical field of power system measurement, and particularly to a self-shielding anti-interference current transformer and a dynamic magnetic field compensation method thereof. Background Art

[0002] Electromagnetic current transformers can convert high currents into low currents, facilitating accurate measurement by measuring instruments. Its primary winding is connected in series in the circuit to be measured, and the secondary winding is connected in series in the measuring instrument. The current transformation is achieved through the principle of electromagnetic induction. In the power system, electromagnetic current transformers are also used in relay protection devices to ensure that the circuit can be quickly cut off in case of a fault, protecting equipment and personnel safety. Since its secondary load impedance is small, the magnitude of the secondary current mainly depends on the primary current, thus realizing the current transformation function. Electromagnetic current transformers are also applied in automatic control systems to achieve automatic control and monitoring of the system by providing standard current signals.

[0003] Traditional electromagnetic current transformers have the following defects in the above applications:

[0004] 1) Traditional electromagnetic current transformers are vulnerable to external stray magnetic field interference, resulting in a decrease in measurement accuracy with an error > 0.5%;

[0005] 2) Existing shielding technologies mostly use static metal shielding layers and cannot adapt to dynamically changing interference magnetic fields;

[0006] 3) The multi-layer shielding structure increases the volume and cost, and there is a problem of coupling interference between shielding layers. Summary of the Invention

[0007] The present invention provides a self-shielding anti-interference current transformer and a dynamic magnetic field compensation method thereof to solve the problems raised in the background art.

[0008] A self-shielding anti-interference current transformer includes:

[0009] A magnetic field sensing layer for real-time detection of external interference magnetic field data;

[0010] A dynamic cancellation layer for setting reverse magnetic field data based on the external interference magnetic field data;

[0011] A residual suppression layer for setting auxiliary magnetic field data for further magnetic field shielding based on the cancellation of the external interference magnetic field data by the reverse magnetic field data.

[0012] Preferably, the material of the dynamic cancellation layer is high-permeability permalloy, and the material of the residual suppression layer is nanocrystalline alloy.

[0013] Preferably, the magnetic field sensing layer includes:

[0014] A range determination unit for determining a scanning range based on the position of the interference source;

[0015] A parameter determination unit for determining the probe scanning direction based on the scanning range and determining the scanning frequency range based on the operating frequency of the interference source;

[0016] A magnetic field detection unit for detecting an external interference magnetic field based on the probe scanning direction and the scanning frequency range to obtain external interference magnetic field data.

[0017] Preferably, the dynamic cancellation layer includes:

[0018] A data processing unit for processing the interference magnetic field data based on Fourier transform to obtain the frequency components of the interference magnetic field and dividing the frequency components into power frequency interference components and broadband interference components;

[0019] A power frequency analysis unit for determining the phase and amplitude of the first compensation coil based on the power frequency interference component to obtain the first reverse magnetic field data;

[0020] A broadband analysis unit for adjusting the waveform of the compensation current in real time based on the broadband interference component to obtain the second reverse magnetic field data.

[0021] Preferably, the residual suppression layer includes:

[0022] A data determination unit for determining the external residual interference magnetic field data after the influence of the reverse magnetic field data on the external interference magnetic field data is cancelled based on the magnetic field sensing layer;

[0023] An auxiliary compensation unit for determining the compensation current for the auxiliary shielding coil based on the external residual interference magnetic field data in combination with the residual suppression control model.

[0024] Preferably, it further includes:

[0025] Determining the temperature compensation coefficient for the high-permeability permalloy based on the magnetic permeability change trend of the high-permeability permalloy with temperature;

[0026] Determining the temperature compensation coefficient for the nanocrystalline alloy based on the magnetic permeability change trend of the nanocrystalline alloy with temperature.

[0027] Preferably, the broadband analysis unit includes:

[0028] An error determination unit for inputting the broadband interference component into the transformer model to obtain the output magnetic field data and obtaining the data error between the output magnetic field data and the broadband interference component;

[0029] A strategy determination unit, configured to determine an initial correspondence between a waveform and an error based on historical current waveform data, and establish an initial dynamic compensation strategy based on the initial correspondence;

[0030] An optimization determination unit, configured to obtain the operating parameters of a current transformer and the magnetic field distribution of an external magnetic field, determine a first compensation optimization coefficient based on the difference between the operating parameters and the standard operating parameters, obtain the unique features of the magnetic field distribution, refine the unique features to obtain a plurality of feature combinations, and integrate the compensation coefficients determined for all the features to obtain a second compensation optimization coefficient;

[0031] A strategy optimization unit, configured to perform real-time dynamic optimization on the initial dynamic compensation strategy based on the first compensation optimization coefficient and the second compensation optimization coefficient to obtain a target dynamic compensation strategy;

[0032] A compensation determination unit, configured to determine compensation current parameters based on the target dynamic compensation strategy in combination with the data error between the output magnetic field data and the broadband interference component, and adjust the waveform of the compensation current in real time based on the compensation current parameters to obtain initial reverse magnetic field data;

[0033] A cyclic compensation unit, configured to feedback the target dynamic compensation strategy based on the latest data error between the initial reverse magnetic field data and the broadband interference component to obtain the latest compensation current parameters, and achieve cyclic compensation for the broadband interference component.

[0034] Preferably, the broadband analysis unit further includes:

[0035] A relationship optimization unit, configured to update the historical current waveform data at each preset time to obtain new historical data, and adjust the initial correspondence based on the new historical data to obtain the latest correspondence;

[0036] A strategy update unit, configured to update the initial dynamic compensation strategy based on the latest correspondence to obtain the latest initial dynamic compensation strategy.

[0037] Preferably, it further includes a collaborative work module, configured to perform collaborative work on the dynamic cancellation layer and the residual suppression layer;

[0038] The collaborative work module includes:

[0039] A priority setting unit, configured to establish a circular buffer for bidirectional data transmission between the dynamic cancellation layer and the residual suppression layer, and establish different transmission priorities for the magnetic field data based on the data type in the magnetic field data before data transmission;

[0040] A synchronization unit, configured to establish a time synchronization mechanism for the dynamic cancellation layer and the residual suppression layer;

[0041] A template retrieval unit, configured to trigger the residual suppression layer to retrieve a magnetic field response template in advance when the dynamic cancellation layer responds to external interference magnetic field data;

[0042] A compression determination unit, configured to establish an adaptive strategy for transmission compression rate according to the rule of setting a high compression rate for low interference and a low compression rate for high interference based on the degree of external interference magnetic field data;

[0043] An operation determination unit, configured to establish an operation rule among a circular buffer, a transmission priority, a time synchronization mechanism, triggering the retrieval of a magnetic field response template, and an adaptive strategy for transmission compression rate based on the association between functional characteristics;

[0044] A cooperation determination unit, configured to establish a cooperation working mechanism based on the circular buffer, the transmission priority, the time synchronization mechanism, triggering the retrieval of a magnetic field response template, and an adaptive strategy for transmission compression rate, in combination with the operation rule.

[0045] A dynamic magnetic field compensation method for a self-shielding anti-interference current transformer, comprising:

[0046] S1: Real-time detecting external interference magnetic field data based on a magnetic field sensing layer;

[0047] S2: Setting reverse magnetic field data based on the dynamic cancellation layer in combination with the external interference magnetic field data;

[0048] S3: Setting auxiliary magnetic field data for further magnetic field shielding based on the residual suppression layer in combination with the cancellation situation of the external interference magnetic field data by the reverse magnetic field data.

[0049] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0050] By real-time detecting external interference magnetic field data through the magnetic field sensing layer, providing a basis for the interference shielding of the magnetic field, setting reverse magnetic field data based on the external interference magnetic field data to realize that the main shielding winding generates a reverse magnetic field and superimposes and cancels with the interference magnetic field, and setting auxiliary magnetic field data for further magnetic field shielding based on the cancellation situation of the external interference magnetic field data by the reverse magnetic field data through the residual suppression layer, the auxiliary shielding winding further eliminates high-frequency residual interference, and finally realizes wide-band interference suppression of 0-20 kHz, can maintain stable performance in the temperature range of -40°C to 120°C, adopts a three-layer dynamic shielding layer, solves the dynamic interference problem in a complex electromagnetic environment, and improves the measurement accuracy to 0.1% level.

[0051] Other features and advantages of the present invention will be described in the subsequent specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in this application document.

[0052] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0053] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0054] Figure 1 is a structural diagram of a self-shielding anti-interference current transformer in an embodiment of the present invention;

[0055] Figure 2 is a structural diagram of the magnetic field sensing layer in the embodiment of the present invention;

[0056] Figure 3 is a flowchart of a dynamic magnetic field compensation method for a self-shielding anti-interference current transformer in an embodiment of the present invention. Detailed Embodiments

[0057] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0058] Embodiment 1

[0059] The embodiment of the present invention provides a self-shielding anti-interference current transformer, as Figure 1 shown, including:

[0060] A magnetic field sensing layer for real-time detection of external interference magnetic field data;

[0061] A dynamic cancellation layer for setting reverse magnetic field data based on the external interference magnetic field data;

[0062] A residual suppression layer for setting auxiliary magnetic field data for further magnetic field shielding based on the cancellation situation of the external interference magnetic field data by the reverse magnetic field data.

[0063] In this embodiment, the external interference magnetic field data includes magnetic field direction, magnetic field intensity, magnetic field signal, etc.

[0064] In this embodiment, the reverse magnetic field data is used to cancel the external interference magnetic field data.

[0065] In this embodiment, based on the cancellation situation of the external interference magnetic field data by the reverse magnetic field data, setting the auxiliary magnetic field data for further magnetic field shielding is, for example, for the residual magnetic field caused by non-linear factors, sensor noise, etc.

[0066] The beneficial effects of the above design scheme are as follows: By using the magnetic field sensing layer to detect external interfering magnetic field data in real time, it provides a basis for the interference shielding of the magnetic field. Based on the external interfering magnetic field data, reverse magnetic field data is set, enabling the main shielding winding to generate a reverse magnetic field that is superimposed and canceled with the interfering magnetic field. Through the residual suppression layer, based on the cancellation situation of the external interfering magnetic field data by the reverse magnetic field data, auxiliary magnetic field data is set for further magnetic field shielding, and the auxiliary shielding winding further eliminates high-frequency residual interference, ultimately achieving wideband interference suppression from 0 to 20 kHz and maintaining stable performance within the temperature range of -40°C to 120°C. By adopting a three-layer dynamic shielding layer, it solves the problem of dynamic interference in complex electromagnetic environments and improves the measurement accuracy to the 0.1% level.

[0067] Embodiment 2

[0068] Based on Embodiment 1, an embodiment of the present invention provides a self-shielding anti-interference current transformer, wherein the material of the dynamic cancellation layer is high-permeability permalloy, and the material of the residual suppression layer is nanocrystalline alloy.

[0069] The beneficial effects of the above design scheme are as follows: By designing the material of the dynamic cancellation layer as high-permeability permalloy and the material of the residual suppression layer as nanocrystalline alloy, the thickness of the shielding layer is reduced by 40% and the weight is reduced by 35%, achieving volume optimization of the anti-interference current transformer.

[0070] Embodiment 3

[0071] Based on Embodiment 1, an embodiment of the present invention provides a self-shielding anti-interference current transformer, as Figure 2 shown, the magnetic field sensing layer includes:

[0072] A range determination unit for determining a scanning range based on the position of the interference source;

[0073] A parameter determination unit for determining the probe scanning direction based on the scanning range and determining the scanning frequency range based on the operating frequency of the interference source;

[0074] A magnetic field detection unit for detecting the external interfering magnetic field based on the probe scanning direction and the scanning frequency range to obtain external interfering magnetic field data.

[0075] The beneficial effects of the above design scheme are as follows: By determining the scanning range based on the position of the interference source, determining the probe scanning direction based on the scanning range, determining the scanning frequency range based on the operating frequency of the interference source, and detecting the external interfering magnetic field based on the probe scanning direction and the scanning frequency range to obtain external interfering magnetic field data, it realizes the accurate acquisition of external interfering magnetic field data, providing an accurate data basis for setting the reverse magnetic field data of the dynamic cancellation layer and ensuring the shielding anti-interference effect.

[0076] Example 4

[0077] Based on Example 1, an embodiment of the present invention provides a self - shielding anti - interference current transformer. The dynamic cancellation layer includes:

[0078] A data processing unit, configured to process the interference magnetic field data based on Fourier transform to obtain the frequency components of the interference magnetic field, and divide the frequency components into power - frequency interference components and broadband interference components;

[0079] A power - frequency analysis unit, configured to determine the phase and amplitude of the first compensation coil based on the power - frequency interference components to obtain the first reverse magnetic field data;

[0080] A broadband analysis unit, configured to adjust the waveform of the compensation current in real time based on the broadband interference components to obtain the second reverse magnetic field data.

[0081] In this embodiment, the first reverse magnetic field data and the second reverse magnetic field data constitute the final reverse magnetic field data.

[0082] In this embodiment, the first reverse magnetic field data is fixed, and the second reverse magnetic field data is dynamically adjusted according to the actual situation.

[0083] The beneficial effects of the above design are as follows: By processing the interference magnetic field data based on Fourier transform, the frequency components of the interference magnetic field are obtained, and the frequency components are divided into power - frequency interference components and broadband interference components, providing a basis for setting the reverse magnetic field data. Based on the power - frequency interference components, the phase and amplitude of the first compensation coil are determined to obtain the first reverse magnetic field data, realizing the cancellation of the power - frequency interference components. Based on the broadband interference components, the waveform of the compensation current is adjusted in real time to obtain the second reverse magnetic field data, realizing the cancellation of the broadband interference components. Finally, the 0 - 20 kHz broadband interference suppression is realized, and the performance can be kept stable in the temperature range of - 40°C to 120°C, solving the dynamic interference problem in a complex electromagnetic environment and improving the measurement accuracy to 0.1% level.

[0084] Example 5

[0085] Based on Example 1, an embodiment of the present invention provides a self - shielding anti - interference current transformer. The residual suppression layer includes:

[0086] A data determination unit, configured to determine the external residual interference magnetic field data after the influence of the reverse magnetic field data on the external interference magnetic field data is cancelled based on the magnetic field sensing layer;

[0087] An auxiliary compensation unit, configured to determine the compensation current for the auxiliary shielding coil based on the external residual interference magnetic field data in combination with the residual suppression control model.

[0088] In this embodiment, the residual suppression control model is based on deep learning and is trained by combining historical residual interference magnetic field data.

[0089] The beneficial effects of the above design are as follows: By determining the external residual interference magnetic field data after the influence of the reverse magnetic field data on the external interference magnetic field data is offset based on the magnetic field sensing layer, and combining the residual suppression control model based on the external residual interference magnetic field data, the compensation current for the auxiliary shielding coil is determined. The auxiliary shielding winding further eliminates high-frequency residual interference, and finally realizes wide-band interference suppression from 0 to 20 kHz, can maintain stable performance in the temperature range of -40°C to 120°C, adopts a three-layer dynamic shielding layer to solve the dynamic interference problem in a complex electromagnetic environment, and improves the measurement accuracy to 0.1%.

[0090] Embodiment 6

[0091] Based on Embodiment 2, an embodiment of the present invention provides a self-shielding anti-interference current transformer, further including:

[0092] Based on the magnetic permeability change trend of the high-permeability permalloy with temperature, determine the temperature compensation coefficient for the high-permeability permalloy;

[0093] Based on the magnetic permeability change trend of the nanocrystalline alloy with temperature, determine the temperature compensation coefficient for the nanocrystalline alloy.

[0094] The beneficial effects of the above design are as follows: By setting the temperature compensation coefficients for the high-permeability permalloy and the nanocrystalline alloy, the influence of the material's temperature change on magnetic field detection is eliminated, ensuring the accuracy of magnetic field detection and magnetic field cancellation.

[0095] Embodiment 7

[0096] Based on Embodiment 4, an embodiment of the present invention provides a self-shielding anti-interference current transformer, and the wide-band analysis unit includes:

[0097] An error determination unit, configured to input the wide-band interference component into the transformer model to obtain output magnetic field data, and obtain the data error between the output magnetic field data and the wide-band interference component;

[0098] A strategy determination unit, configured to determine the initial correspondence between the waveform and the error based on the historical current waveform data, and establish an initial dynamic compensation strategy based on the initial correspondence;

[0099] An optimization determination unit is configured to obtain the operating parameters of a current transformer and the magnetic field distribution of an external magnetic field, determine a first compensation optimization coefficient based on the difference between the operating parameters and the standard operating parameters, obtain the unique features of the magnetic field distribution, refine the unique features to obtain multiple feature combinations, and integrate the compensation coefficients determined for all the features to obtain a second compensation optimization coefficient;

[0100] A strategy optimization unit is configured to perform real-time dynamic optimization on an initial dynamic compensation strategy based on the first compensation optimization coefficient and the second compensation optimization coefficient to obtain a target dynamic compensation strategy;

[0101] A compensation determination unit is configured to determine compensation current parameters based on the target dynamic compensation strategy in combination with the data error between the output magnetic field data and the broadband interference component, and adjust the waveform of the compensation current in real time based on the compensation current parameters to obtain initial reverse magnetic field data;

[0102] A cyclic compensation unit is configured to feedback the target dynamic compensation strategy based on the latest data error between the initial reverse magnetic field data and the broadband interference component to obtain the latest compensation current parameters, and achieve cyclic compensation for the broadband interference component.

[0103] In this embodiment, the second reverse magnetic field data is the sum of the output magnetic field data and the initial reverse magnetic field data.

[0104] In this embodiment, the transformer model is preset according to the parameters of the current transformer.

[0105] In this embodiment, the operating parameters of the current transformer are, for example, operating parameters such as temperature and power. When the difference between the operating parameters and the standard operating parameters is outside the range of the standard operating parameters, the first compensation optimization coefficient is determined based on the influence of the operating parameters on the generation of the electromagnetic field.

[0106] In this embodiment, the unique features of the magnetic field distribution are the distribution features different from the historical magnetic field, and it is necessary to perform refined analysis on them to obtain the second compensation optimization coefficient to make up for the error in determining the reverse magnetic field caused by the change in the magnetic field distribution.

[0107] The beneficial effects of the above design scheme are as follows: By adjusting the waveform of the compensation current in real time based on the broadband interference component, the influence on the determination of the reverse magnetic field is analyzed one by one by using historical data, the characteristics of the inductor itself, and the distribution of the electromagnetic field during the adjustment process, and a search control adjustment strategy is adopted to ensure the real-time performance and accuracy of the dynamic adjustment, realize the cancellation of the broadband interference component, finally realize the suppression of the 0 - 20 kHz broadband interference, can maintain stable performance in the temperature range of -40°C to 120°C, solve the dynamic interference problem in a complex electromagnetic environment, and improve the measurement accuracy to 0.1% level.

[0108] Example 8

[0109] Based on Example 7, an embodiment of the present invention provides a self-shielding anti-interference current transformer. The broadband analysis unit further includes:

[0110] A relationship optimization unit for updating the historical data of the current waveform based on each preset time to obtain new historical data, and adjusting the initial corresponding relationship based on the new historical data to obtain the latest corresponding relationship;

[0111] A strategy update unit for updating the initial dynamic compensation strategy based on the latest corresponding relationship to obtain the latest initial dynamic compensation strategy.

[0112] The beneficial effects of the above design are as follows: By updating the historical data of the current waveform based on each preset time to obtain new historical data, adjusting the initial corresponding relationship based on the new historical data to obtain the latest corresponding relationship, and updating the initial dynamic compensation strategy based on the latest corresponding relationship to obtain the latest initial dynamic compensation strategy, the real-time update of the strategy is realized, so that the strategy can better meet the current accuracy requirements and provide a basis for the shielding of the magnetic field.

[0113] Example 9

[0114] Based on Example 1, an embodiment of the present invention provides a self-shielding anti-interference current transformer, further including a cooperative working module for the cooperative working of the dynamic cancellation layer and the residual suppression layer;

[0115] The cooperative working module includes:

[0116] A priority setting unit for establishing a circular buffer for bidirectional data transmission between the dynamic cancellation layer and the residual suppression layer, and establishing different transmission priorities for the magnetic field data based on the data type in the magnetic field data before data transmission;

[0117] A synchronization unit for establishing a time synchronization mechanism for the dynamic cancellation layer and the residual suppression layer;

[0118] A template retrieval unit for triggering the retrieval of the magnetic field response template by the residual suppression layer in advance when the dynamic cancellation layer responds to the external interference magnetic field data;

[0119] A compression determination unit for establishing an adaptive strategy for the transmission compression rate according to the rule of setting a high compression rate for low interference and a low compression rate for high interference based on the degree of the external interference magnetic field data;

[0120] An operation determination unit, configured to establish an operation rule among a circular buffer, a transmission priority, a time synchronization mechanism, the retrieval of a trigger magnetic field response template, and a transmission compression rate adaptation strategy based on the association among functional features;

[0121] A cooperation determination unit, configured to establish a cooperation working mechanism based on the circular buffer, the transmission priority, the time synchronization mechanism, the retrieval of the trigger magnetic field response template, and the transmission compression rate adaptation strategy, in combination with the operation rule.

[0122] In this embodiment, different transmission priorities are established for the magnetic field data based on the data type in the magnetic field data before data transmission. For example, high priorities are set for intensity and frequency, and low priority is set for auxiliary information.

[0123] In this embodiment, the trigger residual suppression layer retrieves the magnetic field response template in advance to provide a basis for the rapid response determination of the parameters of the residual suppression layer.

[0124] In this embodiment, the transmission compression rate adaptation strategy ensures the transmission speed and transmission quality according to different situations.

[0125] In this embodiment, the operation rule is, for example, to first determine the transmission priority and then determine the compression rate according to the transmission compression rate adaptation strategy. Another example is that after obtaining the magnetic field data, the retrieval of the trigger magnetic field response template is triggered based on the circular buffer.

[0126] The beneficial effects of the above design solution are as follows: By establishing an operation rule among a circular buffer, a transmission priority, a time synchronization mechanism, the retrieval of a trigger magnetic field response template, and a transmission compression rate adaptation strategy based on the association among functional features, and establishing a cooperation working mechanism based on the circular buffer, the transmission priority, the time synchronization mechanism, the retrieval of the trigger magnetic field response template, and the transmission compression rate adaptation strategy, in combination with the operation rule, the rapid response transmission of information between the dynamic cancellation layer and the residual suppression layer is realized, the timeliness of information data is ensured, efficient cooperation work is achieved, and for the rapid response and mutual cooperation of the dynamic cancellation layer and the residual suppression layer to the interference magnetic field, the shielding effect of the self-shielding anti-interference current transformer is ensured from the aspect of data transmission interaction.

[0127] Embodiment 10:

[0128] An embodiment of the present invention provides a dynamic magnetic field compensation method for a self-shielding anti-interference current transformer, as Figure 3 shown, including:

[0129] S1: Real-time detecting external interference magnetic field data based on a magnetic field sensing layer;

[0130] S2: Setting reverse magnetic field data based on the dynamic cancellation layer in combination with the external interference magnetic field data;

[0131] S3: Based on the residual suppression layer, combined with the cancellation situation of the external interference magnetic field data by the reverse magnetic field data, set the auxiliary magnetic field data for further magnetic field shielding.

[0132] In this embodiment, the external interference magnetic field data includes magnetic field direction, magnetic field intensity, magnetic field signal, etc.

[0133] In this embodiment, the reverse magnetic field data is used to cancel the external interference magnetic field data.

[0134] In this embodiment, based on the cancellation situation of the external interference magnetic field data by the reverse magnetic field data, set the auxiliary magnetic field data for further magnetic field shielding, for example, for the residual magnetic field caused by the existence of non-linear factors, sensor noise, etc.

[0135] The beneficial effects of the above design scheme are as follows: The external interference magnetic field data is detected in real time through the magnetic field sensing layer, providing a basis for the interference shielding of the magnetic field. Based on the external interference magnetic field data, the reverse magnetic field data is set to enable the main shielding winding to generate a reverse magnetic field, which is superimposed and cancelled with the interference magnetic field. Based on the cancellation situation of the external interference magnetic field data by the reverse magnetic field data through the residual suppression layer, the auxiliary magnetic field data is set for further magnetic field shielding, and the auxiliary shielding winding further eliminates high-frequency residual interference. Finally, 0-20 kHz broadband interference suppression is achieved, and the performance can be maintained stable in the temperature range of -40°C to 120°C. The three-layer dynamic shielding layer is adopted to solve the dynamic interference problem in a complex electromagnetic environment and improve the measurement accuracy to 0.1% level.

[0136] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of this application document and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A self-shielding anti-interference current transformer, characterized in that, Comprising: A magnetic field sensing layer for real-time detection of external interfering magnetic field data; A dynamic cancellation layer for setting reverse magnetic field data based on the external interfering magnetic field data; The dynamic cancellation layer includes: A data processing unit for processing the interfering magnetic field data based on Fourier transform to obtain the frequency components of the interfering magnetic field, and dividing the frequency components into power frequency interfering components and broadband interfering components; A power frequency analysis unit for determining the phase and amplitude of the first compensation coil based on the power frequency interfering components to obtain the first reverse magnetic field data; A broadband analysis unit for adjusting the waveform of the compensation current in real time based on the broadband interfering components to obtain the second reverse magnetic field data; The broadband analysis unit includes: An error determination unit for inputting the broadband interfering components into a transformer model to obtain output magnetic field data, and obtaining the data error between the output magnetic field data and the broadband interfering components; A strategy determination unit for determining the initial correspondence between the historical current waveform data and the data error based on the historical current waveform data, and establishing an initial dynamic compensation strategy based on the initial correspondence; An optimization determination unit for obtaining the working parameters of the current transformer and the magnetic field distribution of the external magnetic field, determining the first compensation optimization coefficient based on the difference between the working parameters and the standard working parameters, obtaining the unique characteristics of the magnetic field distribution, refining the unique characteristics to obtain a plurality of characteristic combinations, and integrating the compensation coefficients determined for all the characteristics to obtain the second compensation optimization coefficient, where the unique characteristics are distribution characteristics different from the historical magnetic field; A strategy optimization unit for performing real-time dynamic optimization on the initial dynamic compensation strategy based on the first compensation optimization coefficient and the second compensation optimization coefficient to obtain a target dynamic compensation strategy; A compensation determination unit for determining the compensation current parameters based on the target dynamic compensation strategy in combination with the data error between the output magnetic field data and the broadband interfering components, and adjusting the waveform of the compensation current in real time based on the compensation current parameters to obtain the initial reverse magnetic field data; A cyclic compensation unit for feeding back the target dynamic compensation strategy based on the latest data error between the initial reverse magnetic field data and the broadband interfering components to obtain the latest compensation current parameters, and realizing cyclic compensation of the broadband interfering components, where the second reverse magnetic field data is the sum of the output magnetic field data and the initial reverse magnetic field data; A residual suppression layer for setting auxiliary magnetic field data for further magnetic field shielding based on the cancellation situation of the external interfering magnetic field data by the reverse magnetic field data; A collaborative working module for the collaborative working of the dynamic cancellation layer and the residual suppression layer.

2. The self-shielding anti-interference current transformer according to claim 1, characterized in that, The material of the dynamic cancellation layer is high magnetic permeability permalloy, and the material of the residual suppression layer is nanocrystalline alloy.

3. The self-shielding anti-interference current transformer according to claim 1, wherein The magnetic field sensing layer includes: A range determination unit for determining the scanning range based on the position of the interference source; A parameter determination unit for determining the probe scanning direction based on the scanning range, and determining the scanning frequency range based on the operating frequency of the interference source; A magnetic field detection unit for detecting the external interfering magnetic field based on the probe scanning direction and the scanning frequency range to obtain the external interfering magnetic field data.

4. The self-shielding anti-interference current transformer according to claim 1, wherein, The residual suppression layer includes: A data determination unit for determining the external residual interference magnetic field data after the influence of the reverse magnetic field data on the external interference magnetic field data is cancelled based on the magnetic field sensing layer; An auxiliary compensation unit for determining the compensation current for the auxiliary shielding coil based on the external residual interference magnetic field data and in combination with a residual suppression control model, where the residual suppression control model is trained based on deep learning combined with historical residual interference magnetic field data.

5. The self-shielding anti-interference current transformer according to claim 2, wherein, It further includes: Determining the temperature compensation coefficient for the high-permeability permalloy based on the magnetic permeability change trend of the high-permeability permalloy with temperature; Determining the temperature compensation coefficient for the nanocrystalline alloy based on the magnetic permeability change trend of the nanocrystalline alloy with temperature.

6. The self-shielding anti-interference current transformer according to claim 1, characterized in that, The broadband analysis unit further includes: A relationship optimization unit for updating the historical data of the current waveform based on each preset time to obtain new historical data, and adjusting the initial corresponding relationship based on the new historical data to obtain the latest corresponding relationship; A strategy update unit for updating the initial dynamic compensation strategy based on the latest corresponding relationship to obtain the latest initial dynamic compensation strategy.

7. The self-shielding anti-interference current transformer according to claim 1, wherein The collaborative working module includes: A priority setting unit for establishing a circular buffer for bidirectional data transmission between the dynamic cancellation layer and the residual suppression layer, and establishing different transmission priorities for the magnetic field data based on the data type in the magnetic field data before data transmission; A synchronization unit for establishing a time synchronization mechanism for the dynamic cancellation layer and the residual suppression layer; A template retrieval unit for triggering the retrieval of the magnetic field response template by the residual suppression layer in advance when the dynamic cancellation layer responds to the external interference magnetic field data; A compression determination unit for establishing an adaptive strategy for the transmission compression rate according to the rule of setting a high compression rate for low interference and a low compression rate for high interference based on the degree of the external interference magnetic field data; An operation determination unit for establishing an operation rule between the circular buffer, the transmission priority, the time synchronization mechanism, the triggering of the retrieval of the magnetic field response template, and the adaptive strategy for the transmission compression rate based on the association between functional features; A collaboration determination unit for establishing a collaborative working mechanism based on the circular buffer, the transmission priority, the time synchronization mechanism, the triggering of the retrieval of the magnetic field response template, and the adaptive strategy for the transmission compression rate in combination with the operation rule.

8. A dynamic magnetic field compensation method for a self-shielded anti-interference current transformer, specifically used in a self-shielded anti-interference current transformer as described in claim 1, characterized in that, It includes: S1: Real-time detecting the external interference magnetic field data based on the magnetic field sensing layer; S2: Setting the reverse magnetic field data based on the dynamic cancellation layer in combination with the external interference magnetic field data; S3: Setting the auxiliary magnetic field data for further magnetic field shielding based on the residual suppression layer in combination with the cancellation situation of the external interference magnetic field data by the reverse magnetic field data.

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