Hundred-kA impact large-current sensing device based on multi-composite magnetic core material

Abstract

The invention belongs to the technical field of electrical measurement, and particularly discloses a hundred-kA impact large-current sensing device based on a multi-composite magnetic core material. The device comprises a multi-composite magnetic core framework, a current winding coil, a parallel resistor and a shielding shell, the multi-composite magnetic core framework is formed by compounding at least two magnetic materials, the multi-turn current winding coil is distributed on the multi-composite magnetic core framework, and the two ends of the parallel resistor are connected with the two ends of the current winding coil respectively; the shielding shell is located on the outer side of the composite magnetic core framework. A current conductor to be measured penetrates through the composite magnetic core framework in the axial direction, and the measurement output end of the current winding coil is connected with an output circuit. The technical problem that an existing impact large-current sensing device cannot meet the technical requirements of high-amplitude and high-accuracy impact large-current measurement is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical measurement, and in particular relates to a 100 kA impact high current sensor device based on a multi-composite magnetic core material. Background Art

[0002] High-amplitude impulse current measurement technology is the basic supporting technology for performance evaluation of current tolerance of lightning protection equipment, surge protectors, etc., impulse grounding resistance measurement and distributed traveling wave fault location, lightning fault analysis and other scenarios. Therefore, the measurement accuracy of large impulse current directly affects the validity of evaluation data and results.

[0003] The large impulse current has the characteristics of high amplitude, short duration, and wide frequency coverage. The measurement process is accompanied by transient electric-magnetic-thermal-mechanical coupling combined impact. With the continuous development of power system transmission technology, the amplitude of the impulse current continues to increase, and it has now reached 200kA. The current amplitude of the traditional impulse shunt is difficult to exceed 100 kA. As the amplitude of the large impulse current further increases, the existing measurement devices are difficult to meet the measurement amplitude range, waveform parameter type, performance verification method and other aspects of the calibration needs of various domestic industries. The theoretical system of the traditional traceability method is imperfect, and the measurement uncertainty is difficult to further reduce. The Rogowski coil is easily affected by external factors such as eccentricity, and the measurement accuracy is difficult to improve. The electromagnetic current sensor is very easy to saturate under the action of large current and its high-frequency characteristics are limited.

[0004] Typical waveform of impulse current is as follows: Figure 1 As shown in the figure, the waveform characteristic parameters include current peak value, wavefront time T1, and wave tail time T2. The time parameters (T1 / T2) of the typical impulse current waveform to be measured are (1 / 20) μs, (4 / 10) μs, (8 / 20) μs, and (10 / 350) μs, the rise time is several μs, the fall time is tens of μs to hundreds of μs, and the waveform frequency content ranges from 0Hz to several MHz, which puts extremely high requirements on the response characteristics and bandwidth of the measurement device.

[0005] The impulse current measuring device is the key measuring device for the impulse current withstand test of electrical equipment. Its measurement accuracy directly affects the safety and economy of power equipment. The effective way to ensure the accuracy and consistency of the value is to trace the value. Through an uninterrupted chain with a specified uncertainty, the measurement results can be traced back to the national standard or international standard. In recent years, with the continuous development of metrology technology, the continuous improvement of the quality management system, and the increasing export volume of my country's measuring equipment, various enterprises and research institutes have paid more attention to the traceability of the peak value and time parameters of impulse current measuring equipment, and it is necessary to continuously improve the technical capabilities and level of my country's impulse current standard measuring devices.

[0006] The standard impulse current measuring device is a key device in impulse current value traceability. As a reference standard, it transmits the standard value to impulse current measuring devices at all levels. Continuously improving the standard impulse current measurement amplitude and improving the measurement accuracy of impulse current waveform parameters are the direction of high voltage and high current metering work.

[0007] The impulse shunt is the earliest measurement method used and is the most direct measurement method. Its measurement principle is based on Ohm's theorem. The impulse shunt is essentially a measuring resistor. The current to be measured flows through the measuring resistor, and a voltage is generated at both ends of the measuring resistor. The voltage value is used to generate the resistance value to obtain the waveform parameters of the current to be measured. The impulse shunt generally adopts a coaxial structure, which has stable resistance, compact structure, small stray inductance, and excellent high-frequency response characteristics. It is often used for impulse current measurement in the range of hundreds of kA. Due to the limitations of its measurement principle, the shunt needs to be connected in series to the current loop to be measured. When the current loop to be measured is compact and the installation position is limited, this type of measurement device cannot be used. When the amplitude of the current to be measured exceeds the range of hundreds of kA, the shunt will heat up severely and cannot dissipate heat in a limited manner, causing the resistance value to change, affecting the measurement accuracy. When the impulse shunt measures steep pulse impulse current, it may produce an adhesion effect under the action of high-frequency signals, resulting in low utilization of the resistor and changes in resistance value; when measuring a wide pulse width impulse current waveform, due to the accumulation of thermal effects, its measurement amplitude will be further reduced, which cannot meet the growing demand for impulse current measurement.

[0008] The magnetic core Rogowski coil is used as the impulse current standard, and the magnetic core coil is wound with a single coil winding structure. When the current amplitude and pulse width to be measured increase, magnetic saturation is prone to occur. When a single coil winding structure is used, the requirements of output sensitivity, upper frequency limit and response time cannot be met at the same time, and it is difficult to measure impulse currents above 100 kA; due to the limitation of the frequency band characteristics of the magnetic core, it is difficult to respond to current waveforms with ultra-high frequency components.

[0009] The hollow Rogowski coil is used to measure the impact current waveform. Since it has no magnetic core, it can theoretically measure the impact current waveform from hundreds of kA to several MA. The hollow winding coil is connected to a passive integration or active integration circuit to achieve the impact current measurement. However, when the hollow Rogowski coil is connected to a passive integration circuit, its low-frequency characteristics are limited; when it is connected to an active integration circuit, the current coil is easily disturbed by the electric and magnetic fields in space due to the introduction of the power supply circuit, and the measurement accuracy is difficult to improve, so it cannot be used as a standard measurement device for impact current.

[0010] The most important parameters of the impulse current waveform are the peak value, wavefront time and wave tail time. Existing impulse current measurement sensor devices cannot accurately measure the impulse current waveform above 100 kA. They have poor response characteristics, cannot accurately reproduce the impulse current waveform, cannot obtain the peak value and time characteristic parameters of the impulse current waveform, and cannot accurately obtain the standard value of the impulse current. Summary of the invention

[0011] The purpose of the present invention is to provide a 100 kA impulse large current sensor device based on a multi-composite magnetic core material to solve the technical problem that the existing impulse large current sensor device cannot meet the technical requirements of high amplitude and high accuracy impulse large current measurement.

[0012] To achieve the above object, the present invention adopts the following technical solutions: A 100 kA impulse high current sensor device based on a multi-composite magnetic core material comprises: a multi-composite magnetic core skeleton, a current winding coil, a parallel resistor and a shielding shell; the multi-composite magnetic core skeleton is composited with at least two magnetic materials, a multi-turn current winding coil is distributed on the multi-composite magnetic core skeleton, and two ends of the parallel resistor are respectively connected to two ends of the current winding coil; the shielding shell is located on the outside of the composite magnetic core skeleton; a current conductor to be measured penetrates the composite magnetic core skeleton in the axial direction, and a measurement output end of the current winding coil is connected to an output circuit.

[0013] A design method for a 100 kA impulse high current sensor device based on a multi-composite magnetic core material comprises: calculating the ampere-seconds of the current waveform to be measured according to the parameters of the current waveform to be measured; calculating the bandwidth requirement according to the frequency content of the current waveform to be measured; determining the proportion and superposition method of each material in the multi-composite magnetic core material according to the bandwidth requirement; determining the size of the composite magnetic core skeleton based on the ampere-seconds of the current waveform to be measured and the composite magnetic core material; performing a magnetic saturation characteristic test on the magnetic core material to obtain the BH curve data of the magnetic core material; determining the winding wire diameter, number of turns and number of segment groups of the current winding coil by taking the sensitivity, upper cut-off frequency, lower cut-off frequency, winding resistance and heat generation of the current sensor as constraint conditions; calculating the grouped induced voltage, inter-turn capacitance, equivalent inductance and ground capacitance of the current winding coil to perform rationality verification; and determining the reliable working range of the pulse current coil according to the parameters of the sensor device when the rationality verification passes.

[0014] A computer-readable storage medium stores a computer program, wherein the computer program is configured to execute the above-mentioned design method of a 100 kA impulse high current sensor device based on a multi-composite magnetic core material when running.

[0015] An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the design method of the 100 kA impact high current sensor device based on multi-composite magnetic core materials through the computer program.

[0016] In the present invention, a multi-composite magnetic core skeleton is composited with at least two magnetic materials, a multi-turn current winding coil is distributed on the multi-composite magnetic core skeleton, and two ends of a parallel resistor are respectively connected to two ends of the current winding coil; a shielding shell is located on the outside of the composite magnetic core skeleton; a current conductor to be measured penetrates the composite magnetic core skeleton in the axial direction, and a measurement output end of the current winding coil is connected to an output circuit. Based on the multi-composite magnetic core material as the winding skeleton of the current coil, a multi-segment winding structure configuration is adopted, and on the premise of ensuring the sensitivity of the sensor device, the response characteristics of the measuring device are optimized, and the measured current amplitude and bandwidth are expanded, so that the measurement amplitude and bandwidth of the electromagnetic impulse current measuring device are greatly improved, the impulse current peak value and time parameter measurement uncertainty are reduced, and the overall measurement technology level of the impulse large current is improved, and the technical problem that the existing impulse large current sensor device cannot meet the high amplitude and high accuracy impulse large current measurement technology requirements is solved. The invention can be used as an impulse current standard measurement device and is widely used in impulse current equipment manufacturers, national high voltage metering stations, provincial electrical science institutes, meteorological institutes and other impulse current detection and calibration laboratories, greatly improving the overall technical level of my country's impulse current equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a typical waveform of the impact current; Figure 2 1 is a schematic structural diagram of a 100 kA impact high current sensor device based on a multi-composite magnetic core material in an embodiment of the present invention; Figure 3 is a schematic cross-sectional view of a multi-composite magnetic core skeleton in an embodiment of the present invention; Figure 4 Schematic diagram of the winding method of the current winding coil on the multi-composite magnetic core skeleton in an embodiment of the present invention; Figure 5 Schematic diagram of the measurement principle of the magnetic core current coil in an embodiment of the present invention; Figure 6 It is a flow chart of a design method of a 100 kA impact high current sensor device based on a multi-composite magnetic core material in an embodiment of the present invention; Figure 7 It is a flow chart of a design method of a 100 kA impact high current sensor device based on multi-composite magnetic core materials in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0019] It should be noted that, in order to clearly explain the content of the present invention, the present invention specifically cites multiple embodiments to further illustrate different implementations of the present invention, wherein the multiple embodiments are enumerated rather than exhaustive. In addition, for the sake of brevity of explanation, the contents mentioned in the previous embodiments are often omitted in the subsequent embodiments. Therefore, the contents not mentioned in the subsequent embodiments can refer to the previous embodiments accordingly.

[0020] Example 1 A 100 kA impact high current sensor device based on multi-composite magnetic core materials, such as Figure 2 As shown, the device includes: a multi-composite magnetic core skeleton, a current winding coil, a parallel resistor and a shielding shell; the multi-composite magnetic core skeleton is composited with at least two magnetic materials, a multi-turn current winding coil is distributed on the multi-composite magnetic core skeleton, and two ends of the parallel resistor are respectively connected to two ends of the current winding coil; the shielding shell is located on the outside of the composite magnetic core skeleton; the current conductor to be measured passes through the composite magnetic core skeleton in the axial direction, and the measurement output end of the current winding coil is connected to the output circuit.

[0021] As an optional implementation, the current winding coils are distributed on the multi-composite magnetic core skeleton in a segmented form with multiple turns as a group, and multiple groups of current winding coils are connected in series.

[0022] As an optional implementation, both ends of each group of current winding coils are connected in parallel with a parallel resistor.

[0023] Based on multi-composite magnetic core materials as the winding skeleton of the current coil, a multi-segment winding structure configuration is adopted. Under the premise of ensuring the sensitivity of the sensor device, the response characteristics of the measuring device are optimized and its measured current amplitude and bandwidth are expanded.

[0024] As an optional implementation, the multi-composite magnetic core skeleton is composed of magnetic laminations made of at least two materials, and each material is evenly and symmetrically distributed.

[0025] As an optional implementation manner, the thickness of each layer of magnetic laminations does not exceed 10 μm, and each layer of magnetic laminations is annular.

[0026] Optionally, the magnetic laminations of each material are symmetrically distributed in the axial direction of the multi-composite magnetic core skeleton.

[0027] As an optional embodiment, the shielding shell includes a low-frequency band magnetic shielding shell, a high-frequency band magnetic shielding shell and an electric shielding shell. The low-frequency band magnetic shielding shell is used to shield low-frequency magnetic field interference signals within 1 MHz, and the high-frequency band magnetic shielding shell is used to shield high-frequency magnetic field interference signals above 1 MHz.

[0028] As an optional implementation, the high-frequency band magnetic shielding shell is located between the low-frequency band magnetic shielding shell and the electric shielding shell, and the electric shielding shell is located at the outermost layer.

[0029] As an optional implementation, the multi-composite magnetic core skeleton is wrapped with an insulating layer, and the outer layer of the winding current coil is wrapped with an insulating layer.

[0030] As an optional implementation, the magnetic material of the multi-composite magnetic core skeleton includes: ferrite, microcrystalline alloy, and Permalloy.

[0031] The core material of the multi-composite magnetic core skeleton is not limited to the composite composition of multiple laminated magnetic core materials such as ferrite, microcrystalline alloy, and Permalloy. Compared with a single magnetic core material, the composite magnetic core material has the advantages of wider frequency band characteristics and larger magnetic saturation range. In order to ensure the uniformity of the magnetic field strength in the magnetic core material, a variety of different composite magnetic core laminate materials are evenly and symmetrically distributed, and each layer of magnetic laminate material is annular with a thickness of no more than 10μm. The cross-section of the multi-composite magnetic core material is not limited to Figure 3 As shown. According to the actual needs of the current waveform to be measured, a variety of thin-film core materials are laminated and crimped into a ring-shaped composite core material of the required size, and its bandwidth can cover 0.1Hz~10MHz, ensuring full-band accurate measurement of exponential and rectangular impulse current waveforms.

[0032] The impact high current measurement is carried out by connecting multiple winding coils in series, which is not limited to Figure 4 As shown in the figure, the winding method of two consecutive groups is given, taking 6 turns per winding group as an example. A parallel resistor is connected to both ends of each winding coil. The multi-winding impact current sensor is equivalent to multiple parallel single-winding current coils. Its bandwidth is determined by the bandwidth of a single winding. Under the impact of large current, multiple balanced windings respond synchronously. Since the number of turns in a single winding is reduced, the response speed of the coil is effectively improved. Under the condition of the same core material, size, and shielding layer spacing, the capacitance of the multi-segment winding current sensor is m times smaller than that of the single-winding coil. The reduction in capacitance is conducive to increasing the upper cut-off frequency fH and the response speed.

[0033] In order to ensure the good magnetic shielding performance of the current coil, a frequency-segmented magnetic shielding shell is set on the shell of the magnetic core winding coil, with the low-layer shielding layer inside and the high-frequency magnetic shielding layer outside. The high-frequency magnetic shielding shell is mainly used to shield high-frequency magnetic field interference signals above 1MHz, and the low-frequency magnetic shielding shell is mainly used to shield low-frequency magnetic field interference signals within 1MHz, achieving a good shielding effect in the full frequency band of 0Hz~MHz. At the same time, an electric shielding shell is set outside the low-frequency magnetic shielding shell to achieve a good electromagnetic shielding effect.

[0034] The measurement principle of the core current coil is not limited to Figure 5As shown, the current to be measured passes through the magnetic core frame wound with the coil. When the current to be measured I(t) generates a magnetic field in space, when the current to be measured changes, the two ends of the coil wound on the magnetic core coil will induce a voltage U=Mdi / dt proportional to the current change rate. M is the inductance of the current coil. The induced voltage of the current coil is integrated with the size of the coil winding frame and the relative magnetic permeability (determined by the magnetic core material) to obtain a voltage value proportional to the current value to be measured. By comparing with the standard current measuring device, the proportional coefficient of the current measuring device is obtained.

[0035] In the embodiment of the present application, the non-contact magnetic core coil is used to measure the impact current, effectively avoiding the direct connection to the large current loop to cause heating, and realizing the possibility of measuring the large current of 100 kA; the existing magnetic core material is optimized, and the magnetic core materials with various characteristics are superimposed to realize the advantages of multiple magnetic core materials, and ensure the broadband response characteristics, high saturation magnetic field range value, and high relative magnetic permeability of the composite magnetic core material. In view of the problem that the number of turns of the magnetic core coil of the impact current of 100 kA is too much, the internal stray inductance and stray capacitance cause oscillation and poor response characteristics, the multi-winding coil is grouped, and when measuring the impact current waveform, the multi-segment winding responds at the same time to reduce the response time; at the same time, the multi-segment winding is distributedly damped to reduce the oscillation amplitude of the response waveform, reduce the measurement error, and finally realize the accurate measurement of the impact current waveform and parameters.

[0036] The 100 kA impact high current sensor device based on multi-composite magnetic core materials specifically includes a composite magnetic core frame, an insulating layer wrapped around the magnetic core frame, multiple groups of multi-turn current winding coils on the magnetic core frame, parallel damping resistors at both ends of the multi-winding measurement coils, a measurement output end of the current winding coil, an outer insulating layer of the winding current coil, a low-frequency band magnetic shielding shell, a high-frequency band magnetic shielding shell, and an electric shielding shell.

[0037] The winding skeleton of the current sensor adopts multi-composite magnetic core material. Different from the traditional single magnetic core material, the multi-composite magnetic core material is based on a composite composition of various laminated magnetic core materials such as ferrite, microcrystalline alloy, and Permalloy. Compared with the single magnetic core material, while ensuring a higher relative magnetic permeability, the composite magnetic core material has the advantages of wider frequency band characteristics and larger magnetic saturation range.

[0038] In order to ensure the uniformity of the magnetic field strength in the composite magnetic core material, various types of magnetic core lamination materials are evenly and symmetrically distributed and then crimped. The shape of the magnetic core material can be selected according to the size and shape requirements of the winding skeleton of the actual current sensor (it can be a circular ring or a hollow rectangle). The shape of the magnetic core can be a fixed structural core with a rigid structure or an open and closed structural core with a double C structure.

[0039] The area of ​​the multi-layer composite core lamination material is exactly the same. To ensure the uniform penetration of the magnetic field in the core material, the thickness of the single-layer core material does not exceed 10μm. According to the needs of the actual current waveform to be measured, multiple (two or more) thin-film core materials are laminated and crimped into composite core materials of the required size and shape. Its bandwidth can cover 0.1Hz~10MHz, and its relative permeability can be flexibly adjusted from hundreds to hundreds of thousands, which not only ensures the effective acquisition of low-frequency current signals, but also ensures the accurate measurement of high-frequency signals and ensures the full-band accurate measurement of exponential and rectangular impulse current waveforms.

[0040] The magnetic permeability and structural parameters of the magnetic core material of the current sensor are calculated based on a comprehensive evaluation of the sensitivity coefficient of the current sensor, the number of winding turns and other parameters. The type of multi-composite material, the distribution of the laminations and the proportion of the number of layers of different core materials are further determined based on the determined magnetic permeability.

[0041] Different from the single winding winding method used in traditional electromagnetic impulse current transformers, the sensor proposed in this patent uses multiple segmented windings connected in series to measure large impulse currents. After the windings are segmented, the number of turns of a single-segment coil winding is less. After adopting a multi-winding design, when the core material, size, and shielding layer spacing are the same, the capacitance of the multi-segmented winding current sensor is m times smaller than that of a single winding coil. The reduction in capacitance is conducive to increasing the upper cutoff frequency. f H and response speed.

[0042] In terms of physical structure, the multiple segmented windings of the current sensor are connected in series. In terms of response characteristics, when the current to be measured is applied to the sensor, the multi-winding impact current sensor is equivalent to multiple parallel single-winding current coils responding synchronously. Its bandwidth is determined by the bandwidth of a single winding. Under the action of large impact current, multiple balanced windings respond synchronously. Since the number of turns is reduced, the response speed is effectively improved.

[0043] The segmentation of multiple windings in the sensor can be either uniform or non-uniform. When the voltage drop on the coil winding is extremely non-uniform at the moment of the measured current waveform being applied, the non-uniform segmentation can optimize the uniformity of the voltage distribution on the winding coil and further improve the insulation performance of the current sensor. The winding segmentation method of the current sensor is determined by the rise time of the waveform to be measured and the proportion of the current content in each frequency band.

[0044] In order to further optimize the response characteristics of the current sensor, a resistor is connected in parallel at both ends of each segmented winding. The resistance of the parallel resistor is determined by the number of coil turns, sensor sensitivity, and sensor bandwidth. The power of the resistor is determined by the voltage across the resistor and the loop current. The parallel resistor can act as a damping resistor to damp the oscillation caused by the coil's own inductance and parasitic capacitance, and can also act as an integrating resistor.

[0045] In order to ensure the good electromagnetic shielding performance of the sensor, a frequency-segmented magnetic shielding shell is set outside the insulation layer of the magnetic core winding coil of the current sensor, with the low-layer shielding layer inside and the high-frequency magnetic shielding layer outside. The high-frequency magnetic shielding shell is mainly used to shield high-frequency magnetic field interference signals above 1MHz, and the low-frequency magnetic shielding shell is mainly used to shield low-frequency magnetic field interference signals within 1MHz, achieving a good shielding effect in the full frequency band of 0Hz~MHz. At the same time, an electric shielding shell is set outside the low-frequency magnetic shielding shell to finally achieve a good electromagnetic shielding effect.

[0046] In the embodiment of the present application, the current measurement amplitude, pulse width and waveform frequency band of the impulse current sensor are greatly improved; the frequency band measurement range of the magnetic core material is effectively expanded by using a composite superposition method of multiple different magnetic core materials, and its magnetic saturation range is greatly improved; the types and proportions of the constituent materials of the multi-composite magnetic core material can be flexibly determined according to the ampere-second number and frequency band range of the current waveform to be measured, and it is suitable for measuring a wide range of current waveforms; through the structure of multi-winding segments, a single multi-turn winding is reconstructed into a multi-segmented winding with fewer turns, and the multi-segmented windings synchronously respond to the same current to be measured, the response speed is effectively improved, and the upper cut-off frequency of the sensor is effectively improved; multiple resistors are connected in parallel at both ends of the multi-winding, and the resistor can play the role of an integral resistor or a distributed damping resistor, which effectively suppresses the oscillation amplitude caused by the equivalent inductance and capacitance parameters in the current coil when the impulse current acts; the combined shielding form of a high- and low-frequency segmented magnetic shielding shell and an electric shielding shell is adopted to achieve high shielding effectiveness within the full frequency band, effectively improve the shielding effectiveness of the sensor, and improve the measurement accuracy of the sensor. In summary, the 100 kA impulse high current sensor device based on multi-composite magnetic core materials is not only suitable for impulse current waveform measurement, but also suitable for steep current pulse sensors with shorter pulse widths and sensors for long pulse width current measurement, and is universal.

[0047] Example 2 A design method for a 100 kA impact high current sensor device based on a multi-composite magnetic core material is used to obtain the above-mentioned 100 kA impact high current sensor device based on a multi-composite magnetic core material, not limited to Figure 6 As shown, including: S602, calculating the ampere-seconds of the current waveform to be measured according to the current waveform parameters to be measured; S604, calculating the bandwidth requirement according to the frequency content of the current waveform to be measured; S606, determining the proportion and stacking method of each material in the multi-composite magnetic core material according to the bandwidth requirement; S608, determining the size of the composite magnetic core skeleton based on the ampere-seconds of the current waveform to be measured and the composite magnetic core material; S610, performing a magnetic saturation characteristic test on the magnetic core material to obtain BH curve data of the magnetic core material; S612, using the sensitivity, upper cutoff frequency, lower cutoff frequency, winding resistance, and heat generation of the current sensor as constraint conditions to determine the winding wire diameter, number of turns, and number of segment groups of the current winding coil; S614, calculating the grouped induced voltage, turn-to-turn capacitance, equivalent inductance, and ground capacitance of the current winding coil to verify rationality; S616: When the rationality verification is passed, the reliable working range of the pulse current coil is determined according to the parameters of the sensor device.

[0048] The design method of the 100 kA impulse high current sensor device based on the multi-composite magnetic core material is not limited to determining the parameters of each part of the 100 kA impulse high current sensor device based on the multi-composite magnetic core material. The specific steps are not limited to the following: Figure 7 As shown: Determine the amplitude and parameters of the current waveform to be measured, and then determine the ampere-seconds of the current waveform to be measured and determine the upper and lower limits of the frequency of the current waveform to be measured; determine and calculate the ampere-seconds of the current waveform to be measured based on the parameters of the current waveform to be measured. The ampere-seconds is an important indicator to measure the measurement capability of the pulse coil, which represents the product of the maximum measurement current that the coil can withstand and the pulse width.

[0049] Determine the proportion and stacking method of the composite magnetic core material; determine the proportion and stacking method of different magnetic core materials in the multi-composite magnetic core material according to the bandwidth requirements.

[0050] Determine the inner and outer diameters and height parameters of the composite magnetic core material; determine the inner and outer diameters and height of the magnetic core material based on the ampere-seconds of the current waveform to be measured and the determined composite magnetic core material.

[0051] Determine the BH parameter curve of the winding magnetic core; conduct magnetic saturation characteristic tests on the magnetic core material to obtain the BH curve data of the magnetic core material.

[0052] Determine the winding cross-sectional dimensions, number of turns, and number of winding segments; use the current sensor's sensitivity, upper cutoff frequency, lower cutoff frequency, winding resistance, and heat generation as constraints to preliminarily determine the winding wire diameter, number of turns, and number of winding segments.

[0053] Determine the thickness parameters of the shielding layer between the winding coil and the housing; determine the thickness parameters of the shielding layer between the winding coil and the housing based on insulation requirements and ground capacitance parameter requirements.

[0054] The sensor transfer function is determined based on the thickness parameters of the shielding layer between the winding coil and the housing and the winding cross-sectional dimensions, the number of turns, and the number of winding segments.

[0055] The excitation current value is calculated according to the sensor transfer function to determine whether it is saturated, and the sensor winding capacitance, resistance, inductance and other parameters are calculated to determine whether the bandwidth meets the design requirements.

[0056] According to the design results, the coil winding induced voltage, turn-to-turn capacitance, equivalent inductance, capacitance to ground and other parameters are further calculated to ensure the rationality of the design. The reliable working range of the pulse current coil is determined based on the final designed parameter results.

[0057] Example 3 Another aspect of the embodiments of the present invention further provides an electronic device for implementing the above-mentioned design method of the 100 kA impulse high current sensor device based on multi-composite magnetic core materials, and the electronic device is not limited to being a terminal device or a server in the system. The electronic device is not limited to including a memory and a processor, the memory stores a computer program, and the processor is configured to execute the steps in any of the above-mentioned method embodiments through the computer program.

[0058] Example 4 Another aspect of the embodiments of the present invention provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method provided in various optional embodiments of the design method of the 100 kA impact high current sensor device based on multi-composite magnetic core materials. The computer program is configured to execute the steps of any of the above method embodiments when running.

Claims

1. A 100 kA impact high current sensor device based on multi-composite magnetic core material, characterized in that: include: Multiple composite core skeleton, current winding coil, shunt resistor and shielding shell; The multi-composite magnetic core skeleton is made of at least two magnetic materials, the current winding coil is distributed on the multi-composite magnetic core skeleton, and the two ends of the parallel resistor are respectively connected to the two ends of the current winding coil; the shielding shell is located outside the composite magnetic core skeleton; The current conductor to be measured passes through the composite magnetic core frame in the axial direction, and the measurement output end of the current winding coil is connected to the output circuit.

2. The 100 kA impact high current sensor device based on multi-composite magnetic core material according to claim 1, characterized in that: The current winding coils are distributed on the multi-composite magnetic core skeleton in a segmented form with multiple turns as a group, and multiple groups of current winding coils are connected in series.

3. The 100 kA impact high current sensor device based on multi-composite magnetic core material as claimed in claim 2, characterized in that: A parallel resistor is connected in parallel at both ends of each current winding coil.

4. The 100 kA impact high current sensor device based on multi-composite magnetic core material according to claim 1, characterized in that: The magnetic material of the multi-composite magnetic core skeleton includes: ferrite, microcrystalline alloy, and permalloy.

5. The 100 kA impact high current sensor device based on multi-composite magnetic core material according to claim 1, characterized in that: The multi-composite magnetic core skeleton is composed of magnetic laminations made of at least two materials, and each material is evenly and symmetrically distributed.

6. The 100 kA impact high current sensor device based on multi-composite magnetic core material as claimed in claim 4, characterized in that: The thickness of each magnetic lamination layer does not exceed 10 μm, and each magnetic lamination layer is annular.

7. The 100 kA impact high current sensor device based on multi-composite magnetic core material according to claim 1, characterized in that: The shielding shell includes a low-frequency magnetic shielding shell, a high-frequency magnetic shielding shell and an electric shielding shell. The low-frequency magnetic shielding shell is used to shield low-frequency magnetic field interference signals within 1 MHz, and the high-frequency magnetic shielding shell is used to shield high-frequency magnetic field interference signals above 1 MHz.

8. The 100 kA impact high current sensor device based on multi-composite magnetic core material as claimed in claim 7, characterized in that: The high-frequency band magnetic shielding shell is located between the low-frequency band magnetic shielding shell and the electric shielding shell, and the electric shielding shell is located at the outermost layer.

9. The 100 kA impact high current sensor device based on multi-composite magnetic core material according to claim 1, characterized in that: The multi-composite magnetic core skeleton is wrapped with an insulating layer, and the outer layer of the winding current coil is wrapped with an insulating layer.

10. A design method for a 100 kA impact high current sensor device based on a multi-composite magnetic core material, used to obtain the 100 kA impact high current sensor device based on a multi-composite magnetic core material as claimed in any one of claims 1 to 9, characterized in that: include: Calculate the ampere-seconds of the current waveform to be measured according to the current waveform parameters to be measured; Calculate bandwidth requirements based on the frequency content of the current waveform to be measured; Determine the proportion and stacking method of each material in the multi-composite magnetic core material according to the bandwidth requirements; Determine the size of the composite magnetic core skeleton based on the ampere-second value of the current waveform to be measured and the composite magnetic core material; Conduct magnetic saturation characteristic test on the magnetic core material to obtain BH curve data of the magnetic core material; The sensitivity, upper cut-off frequency, lower cut-off frequency, winding resistance and heat generation of the current sensor are used as constraints to determine the winding wire diameter, number of turns and number of segment groups of the current winding coil; Calculate the group induced voltage, turn-to-turn capacitance, equivalent inductance, and ground capacitance of the current winding coil to verify its rationality; When the rationality verification is passed, the reliable working range of the pulse current coil is determined according to the parameters of the sensor device.

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