Current measurement method and system of novel non-closed-loop strong-disturbance-rejection current sensor

Abstract

According to the current measurement method and system of the novel non-closed-loop strong-disturbance-rejection current sensor, information of a magnetic field generated by the measured current and information of a disturbance magnetic field are obtained at the same time on the basis of surface coils in different space directions and algorithms, the waveform of the measured current is deduced in combination with coil parameters and installation positions, high-frequency current is rapidly measured with high precision, and the measurement accuracy is high. The problem that a closed-loop structure sensor is not easy to use is solved. The device is small in size, space-saving, simple in structure, convenient to mount and high in universality; the device can be used for measuring PCB wiring without punching and power-off installation, is used for measuring a scene where a current sensor with a closed framework is not easy to install, and has important significance for measuring high-frequency current of PCB wiring and current of a wire fixed on a wall. According to the invention, the problems of circuit invasion and insufficient bandwidth of the existing shunt resistor and Hall device measurement method are overcome; the device has the advantages of simple structure, high measurement precision and strong anti-interference capability, is more suitable for measuring high-frequency current, and can be easily installed in PCB wiring or an integrated circuit to realize on-line measurement.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of current sensor design, and particularly relates to a current measurement method and system of a non-closed-loop strong anti-interference novel current sensor. BACKGROUND

[0002] In modern electrical equipment, it is of great significance to accurately measure the current in the PCB trace. The current size not only affects the normal work of the circuit and the control system, but also directly determines the signal integrity and the safety of the device. The current commonly used current measurement methods mainly include two types: One type is the current sensor based on shunt resistance, which needs to be inserted into the circuit and installed during power failure. The insertion into the circuit will change the measured line parameters. Although the Hall device can realize non-contact measurement, it has insufficient sensitivity in small current situations and is difficult to apply in high-frequency current measurement scenarios, and it also needs additional magnetic circuit design, which increases the complexity and volume of the device.

[0003] The other type is the skeleton closed-loop current sensor, such as the Rogowski coil current sensor and the ferromagnetic current sensor. However, the closed-loop current sensor needs to be punched on the PCB to surround the measured trace, and the commonly used fixed wire on the wall is not easy to measure the current using the closed-loop current sensor. The existing non-closed-loop current sensor cannot eliminate the influence error of the interference magnetic field. Therefore, it is urgent to develop a non-closed-loop current sensor with high measurement accuracy and strong anti-interference. SUMMARY

[0004] The technical problem to be solved by the application is to provide a current measurement method and system of a non-closed-loop strong anti-interference novel current sensor for quickly and accurately measuring high-frequency current that is not easy to use a closed-loop sensor.

[0005] The technical solution adopted by the application to solve the above technical problem is: a current measurement method of a non-closed-loop strong anti-interference novel current sensor, comprising the following steps: S1: setting a center point of a certain cross section of the measured line as the origin O establishing a three-dimensional rectangular coordinate system, the measured line direction being x axis, the conductor cross section perpendicular to x axis is yOz , the length and width of the rectangular conductor cross section are respectively parallel to y axis and z axis; S2: placing three coils respectively above the measured line at a certain height; the extension planes of the coils respectively intersect the geometric center axis of the measured line, are located in the yOz plane perpendicular to the direction of the measured line, and are parallel to the xOyflat; S3: Based on the electromagnetic field pseudo-problem theory, derive the mapping relationship between the induced voltage of the three coils and the measured current; S4: Substitute the induced voltage of the coil into the mapping formula to calculate the magnetic field generated by the circuit under test at the center point of the coil, where the center point of the coil is located on the z-axis; S5: Calculate the installation height of the coil based on the rectangular cross-sectional dimensions of the circuit being tested; S6: Calculate the measured current based on the magnetic field generated at the center point of the coil by the circuit under test and the installation height of the coil.

[0006] According to the above scheme, in step S2, the coil is a planar helical wound coil.

[0007] According to the above scheme, in step S2, the extended plane of coil 1 intersects the geometric center axis of the circuit under test, and the extended plane of coil 2 is perpendicular to the direction of the circuit under test and located at... yOz On the surface, the extended plane of coil plane of coil No. 3 is parallel to the plane of the circuit being tested.

[0008] Furthermore, in step S3, the induced voltage of coil 1 is measured as follows: The induced voltage of coil No. 2 is The induced voltage of coil No. 3 is .

[0009] Furthermore, in step S4, the specific steps are as follows: set up Let be the angular frequency, and s1, s2, and s3 be the equivalent areas of coil 1, coil 2, and coil 3, respectively. The tilt angle of coil 1, that is, the angle between the plane of coil 1 and the plane of coil 1. z The angle between the axes; the normal vector of the center point of the plane of coil 1 is n 1(0, cos θ sin θ The normal vector of the center point of the plane of coil 2 is... n 2 (0, -1, 0), the normal vector of the center point of coil 3 is n 3 (0, 0, 1), the interfering magnetic field at the center point of the coil is B s ( B sx ，B sy ，B sz ); The magnetic field generated at the center point of the coil by the induced voltage of the coil is calculated. B i ( Bix , B iy , B iz ): , .

[0010] Further, in the step S4, the disturbance magnetic field of the coil center point is calculated according to matrix operation B s and the magnetic field component generated by the measured current .

[0011] According to the above scheme, in the step S5, the specific steps are as follows: The cross section of the measured line is rectangular, and the cross-sectional area of the rectangle is A, the length is a , and the width is b ; the magnetic field generated by the line current at the center point of the cross section above the measured line (0, 0, h ) is B o , the magnetic field generated by the line current at the upper right corner of the rectangular cross section (0, a / 2, b / 2) above the measured line (0, 0, h ) is B e , then: , , , , , ; Let h at the height , then is obtained from ; let the error be less than 1%, then : , Let , Here is the binomial expansion, , , , , that is, when the error is less than 1%, and​ At this time, the influence of the skin effect of the rectangular cross-section conductor is ignored, and the rectangular cross-section conductor is equivalent to a linear current-carrying conductor with a geometric center at the coordinate origin.

[0012] Further, in the step S6, the specific steps are as follows: is the vacuum permeability, is the magnetic field intensity generated by the coil center point of the measured line at (0, 0, h ); the measured current is calculated as: .

[0013] A current measurement system of a non-closed loop strong anti-interference novel current sensor, A coordinate establishing submodule is configured to set a center point of a certain cross-section of the measured line as the origin O A three-dimensional rectangular coordinate system is established, and the direction of the measured line is x axis, and the cross-section of the conductor perpendicular to x axis is yOz , and the length and width of the rectangular cross-section of the conductor are respectively parallel to y axis and z axis; A coil setting submodule is configured to place three coils at a certain height above the measured line respectively; the extension planes of the coils respectively intersect with the geometric center axis of the measured line, are located on a yOz plane perpendicular to the direction of the measured line, and are parallel to a xOy plane in which the measured line is located; A voltage measurement submodule is configured to derive a mapping relationship between the induced voltages of the three coils and the measured current based on the electromagnetic field problem theory; A magnetic field calculation submodule is configured to bring the induced voltages of the coils into the mapping relationship to calculate the magnetic field generated by the measured line at the coil center point, and the coil center point is located on the z axis; A height calculation submodule is configured to calculate the installation height of the coil according to the size of the rectangular cross-section of the measured line; A current calculation submodule is configured to calculate the measured current according to the magnetic field generated by the measured line at the coil center point and the installation height of the coil.

[0014] A computer memory has a computer program stored therein, and the computer program can be executed by a computer processor, and the computer program executes a current measurement method of a non-closed loop strong anti-interference novel current sensor.

[0015] The beneficial effects of the present application are: 1. The current measurement method and system of a new type of non-closed loop strong anti-interference current sensor of the application, based on coils arranged in different directions and algorithms to obtain the magnetic field information generated by the measured current and the interference magnetic field information, and combined with the coil parameters and installation position to derive the size of the measured current, realizing the function of fast and high-precision measurement of high-frequency current that cannot be measured by closed loop structure sensors, avoiding the limitations of traditional shunt method, Hall measurement devices and ring closed current sensors, and improving the flexibility and versatility of the current sensor.

[0016] 2. The application has small volume, saves space, simple structure, easy installation, strong versatility; no need for PCB punching and power-off installation, used for measuring scenes where it is not easy to install current sensors with closed structure, such as measuring the current of PCB printed lines which need to punch through the closed ring current sensor on the PCB, or the wires fixed on the wall which are not easy to put on the ring current sensor, which is of great significance for measuring high-frequency current of integrated PCB board wiring and wires fixed on the wall.

[0017] 3. The application overcomes the problem of insufficient accuracy of existing shunt resistance and Hall device measurement method in high frequency scene; high measurement accuracy, strong anti-interference ability, more suitable for measuring high frequency current, easy to install in PCB board wiring or integrated circuit to realize online measurement.

[0018] Of course, any product implementing the application does not necessarily need to achieve all the advantages described above, and the application is not only suitable for measuring circular cross-section wires but also suitable for rectangular cross-section wires. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of 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 are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 is a flow chart of an embodiment of the application.

[0021] Figure 2 is a structural schematic diagram of an embodiment of the application.

[0022] Figure 3 is a simulation diagram of an embodiment of the application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the application more clear, the following will further describe the application in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and are not used to limit the application.

[0024] Embodiment 1 Referring to Figure 1 The specific steps of the current measurement method of the non-closed loop strong anti-interference new current sensor are as follows: S1: set a center point of a certain cross section of the measured line as the origin O A three-dimensional rectangular coordinate system is established, and the measured line direction is x axis, and the conductor cross section perpendicular to x axis is yOz , and the length and width of the rectangular conductor cross section are respectively parallel to y axis and z axis; S2: place three coils respectively at a certain height above the PCB trace; and number the three coils, the coil whose extension plane intersects the geometric center axis of the trace is numbered as No. 1 coil, the plane coil perpendicular to the trace direction is No. 2 coil, and the coil parallel to the trace is No. 3 coil; The three coils are planar spiral coils, and the spatial planes of the three planar coils are respectively parallel to the measured trace, perpendicular to the measured trace direction, and the extension plane of the plane is compared with the geometric center axis of the measured trace.

[0025] S3: measure the induced voltage values of the three coils, the induced voltage of No. 1 coil is , the induced voltage of No. 2 coil is , and the induced voltage of No. 3 coil is ; S4: bring into the algorithm for distinguishing the interference magnetic field and the magnetic field generated by the measured current to calculate the magnetic field strength; The center point normal vector of the plane of No. 1 coil is n 1(0, cos θ , sin θ ), the center point normal vector of the plane of No. 2 coil is n 2(0, -1, 0), and the center point normal vector of No. 3 coil is n 3(0, 0, 1), and the interference magnetic field at the coil center point is B s B sx ，B sy ，B sz The coil induced voltage value obtained by step S3 is used to calculate the magnetic field generated by the measured conductor at the coil center point B i B ix B iy B ​​​​iz ):

[0026]

[0027] in, Let be the angular frequency, and s1, s2, and s3 be the equivalent areas of coils 1, 2, and 3, respectively. The tilt angle of coil number 1. The coil induced voltage is measured in step S3; then, the calculation is performed based on matrix operations. .

[0028] S5: Calculate the installation height of the coil based on the rectangular cross-section of the PCB traces; Consider the PCB trace cross-section as a rectangle, and establish a three-dimensional Cartesian coordinate system with the center point of this rectangle as the origin. Let the cross-sectional area of ​​the PCB trace be A, and the length of the rectangular cross-section be... a Width b At this time, the linear current at the center point of the cross-section is located above the conductor being measured (0, 0, ...). h The magnetic field generated at point () is B o The line current at the upper right corner (0, a / 2, b / 2) of the rectangular cross-section is located above the conductor being measured at (0, 0, ...). h The magnetic field generated at point () is B e ,but:

[0029]

[0030]

[0031]

[0032]

[0033]

[0034] At high altitude h Place Then by The conclusion is Assuming the error is less than one percent, then :

[0035] set up

[0036] This is a binomial expansion.

[0037]

[0038]

[0039]

[0040] When the error is less than 1%, the influence of the rectangular cross-section of the wire can be ignored, and the rectangular cross-section wire is equivalent to a wire current carrying wire with the geometric center of the ignored cross-section at the coordinate origin. S6: Calculate the measured current according to the magnetic field generated by the measured current and the installation height of the sensor:

[0041] Wherein,

[0042] is the vacuum permeability, is the measured wire magnetic field strength at the height of in step S4, h is the height above the PCB trace in step S5. h

[0043] The embodiment simultaneously obtains the magnetic field information generated by the measured current and the interference magnetic field information based on the coils arranged in different directions and the algorithm, and deduces the size of the measured current in combination with the coil parameters and the installation position, realizes the function of quickly and accurately measuring high-frequency current which cannot be measured by a closed-loop structure sensor, avoids the limitations of traditional shunt method, Hall measurement device and ring-closed current sensor, and improves the flexibility and universality of the current sensor.

[0044] Embodiment 2 The steps of the embodiment are the same as those of embodiment 1, and the difference is that each step is applied to a specific example and a parallel PCB trace. Specifically, the steps include the following steps: As shown in Figure 2 , the thickness and width of the PCB trace to be tested in the embodiment are a and b respectively, and a parallel trace is set to simulate the stray interference magnetic field generated in the measurement environment.

[0045] S1: Set the center point of the cross-section of the measured PCB rectangular trace as the origin of the three-dimensional rectangular coordinate system, establish a three-dimensional rectangular coordinate system, and the direction of the PCB trace and the plane perpendicular to the trace cross-section are x axis and yOz plane; ​S2: The PCB trace is generally a straight line segment, so place three coils respectively at a certain height directly above the trace; number the three coils respectively, the coil number of the extension plane of the coil intersecting the geometric center line of the trace is No. 1 coil, the plane coil perpendicular to the trace direction is No. 2 coil, and the parallel coil is No. 3 coil; S3: The induced voltage values of the three coils are obtained by ANSYS MAXWELL simulation, such as Figure 3 The induced voltage of No. 1 coil is The induced voltage of No. 2 coil is The induced voltage of No. 3 coil is The angle θ is 10°.

[0046] S4: Calculate the magnetic field intensity: The center point normal vector of No. 1 coil plane is n 1(0, cos θ , sin θ ), the center point normal vector of No. 2 coil plane is n 2(0, -1, 0), and the center point normal vector of No. 3 coil is n 3(0, 0, 1). The interference magnetic field at the coil center point is B s B sx B sy B sz The magnetic field generated by the measured wire at the coil center point is calculated by the coil induced voltage value obtained in step S3 B i B ix B iy B iz :

[0047]

[0048] wherein is the angular frequency, s1, s2, s3 are the equivalent areas of No. 1 coil, No. 2 coil and No. 3 coil, is the inclination angle of No. 1 coil, is the coil induced voltage measured in step 3. Then, according to matrix operation, the is calculated.

[0049] S5: Calculate the height required for coil placement (error less than 1%) ​​​​​​The PCB trace section is regarded as a rectangle, and a three-dimensional rectangular coordinate system is established with the center point of the rectangle as the origin. The length of the rectangle is a, the width is b, and the distance between the measured conductor and the interference conductor is c = 3a. At this time, the magnetic field generated by the line current at the center point of the section at (0, 0, h ) above the measured conductor is B o The magnetic field generated by the line current at the upper right corner of the rectangular section (0, a / 2, b / 2) at (0, 0, h ) above the measured conductor is B e .

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

[0056] where A represents the area of the PCB trace section Let h at the height , then can be obtained Next, we set the error to be less than one percent, then :

[0057] Let

[0058] Here is the binomial expansion

[0059]

[0060]

[0061]

[0062] S6: Calculate the current value according to the magnetic field strength calculated in step 4:

[0063] where is the vacuum permeability, is the measured wire magnetic field strength in step 4, h is the height above the PCB trace in step 5.

[0064] Table 1 simulation error analysis

[0065] As shown in Table 1, based on the comparison of the data of the fast calculation method and the simulation setting data, it can be seen that the data of the calculation method and the simulation setting data are basically consistent.

[0066] The embodiment overcomes the problem of insufficient precision of the existing shunt resistance and Hall device measurement method in the high-frequency and small-current scene; has high measurement precision, strong anti-interference ability, is more suitable for measuring high-frequency current, and is easy to install in the PCB trace or integrated circuit to realize online measurement.

[0067] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0068] Embodiment 3 The embodiment is used to realize the principle of the above-mentioned method embodiment to construct a current measurement system of a new type of current sensor with non-closed loop and strong anti-interference, which comprises a coordinate establishment submodule, a coil setting submodule, a voltage measurement submodule, a magnetic field calculation submodule, a height calculation submodule and a current calculation submodule.

[0069] The coordinate establishment submodule is used to set a center point of a certain section of the measured line as the origin O A three-dimensional rectangular coordinate system is established, and the direction of the measured line is x axis, perpendicular to x axis, and the conductor section perpendicular to yOz axis is y , and the length and width of the rectangular conductor section are respectively parallel to z axis and axis; yOz The coil setting submodule is used to place three coils respectively at a certain height above the measured line; the extension planes of the coils respectively intersect the geometric center axis of the measured line, are located in the xOy plane perpendicular to the direction of the measured line, and the plane parallel to the plane where the measured line is located; The voltage measurement submodule is used to measure the induced voltages of the coils respectively; The rectangular cross-section measured conductor height calculation sub-module is configured to calculate the installation height of the coil according to the cross-section of the measured line; The current calculation sub-module is configured to calculate the measured current according to the magnetic field generated by the measured line at the center point of the coil directly above the geometric center line of the measured conductor and the installation height of the coil.

[0070] Each sub-module is mainly used for realizing each step of the method embodiment, and details are not described herein.

[0071] It should be noted that, according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or part of the operation of the steps / components can be combined into a new step / component, so as to achieve the purpose of the present application.

[0072] The embodiment also includes a processor, a communication interface, a memory and a communication bus; wherein the processor, the communication interface and the memory complete the communication among each other through the communication bus; the memory stores a computer program; when the program is executed by the processor, the processor executes the steps of the current measurement method of the non-closed loop strong anti-interference new current sensor.

[0073] The embodiment also provides a computer readable storage medium, which stores executable instructions, and the instructions make the processor realize the current measurement method of the non-closed loop strong anti-interference new current sensor when executed by the processor.

[0074] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects.

[0075] Moreover, the present application can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0076] The present application is described with reference to the flowcharts of the method and the computer program product according to the embodiment 1 of the present application and the block diagrams of the devices (systems) of the embodiment 3. It should be understood that each flow or block in the flowcharts or block diagrams, and the combination of the flows or blocks in the flowcharts or block diagrams can be realized by computer program instructions.

[0077] These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the steps in the flowcharts or block diagrams. Figure 1 The computer program instructions can also be loaded onto a computer or other programmable data processing device, so that one or more processes or blocks in the flowcharts or block diagrams are executed on the computer or other programmable data processing device to produce a device for implementing the steps in the flowcharts or block diagrams.Figure 1 A current measurement system of a non-closed loop strong anti-interference novel current sensor.

[0078] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flow Figure 1 A flow or flows or blocks Figure 1 The functions specified in one block or multiple blocks.

[0079] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process so that the instructions executed on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 A flow or flows or blocks Figure 1 The steps of a current measurement method of a non-closed loop strong anti-interference novel current sensor specified in one block or multiple blocks.

[0080] The above examples are only used to illustrate the design ideas and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and the protection scope of the present application is not limited to the above examples. Therefore, any equivalent changes or modifications made in accordance with the principles and design ideas disclosed by the present application are within the protection scope of the present application.

Claims

1. A current measurement method of a non-closed loop strong immunity novel current sensor, characterized in that: The method comprises the following steps: S1: set a center point of a certain section of the measured line as the origin O A three-dimensional rectangular coordinate system is established, and the direction of the measured line is x axis, perpendicular to x The conductor section of the axis is yOz , the length and width of the rectangular conductor section are parallel to y axis and z axis, respectively; S2: placing three coils respectively at a certain height directly above the measured line; the extension planes of the coils respectively intersect the geometric center axis of the measured line, are located in the plane perpendicular to the direction of the measured line, and are parallel to the plane where the measured line is located; yOz S2: placing three coils respectively at a certain height directly above the measured line; the extension planes of the coils respectively intersect the geometric center axis of the measured line, are located in the plane perpendicular to the direction of the measured line, and are parallel to the plane where the measured line is located; xOy S2: placing three coils respectively at a certain height directly above the measured line; the extension planes of the coils respectively intersect the geometric center axis of the measured S3: mapping relationship between the induced voltage of the three coils and the measured current is derived based on the electromagnetic field quasi-problem theory; S4: Substitute the induced voltage of the coil into the mapping formula to calculate the magnetic field generated by the circuit under test at the center point of the coil. The center point of the coil is located at... z On the axis; S5: the installation height of the coil is calculated according to the rectangular cross-sectional size of the measured line; S6: the measured current is calculated according to the magnetic field generated by the measured line at the center point of the coil and the installation height of the coil.

2. The current measurement method of the non-closed loop strong anti-interference novel current sensor according to claim 1, characterized in that: In the step S2, the coil is a planar spiral winding coil.

3. The current measurement method of a non-closed loop strong anti-interference novel current sensor according to claim 1, characterized in that: In step S2, the extension plane of the coil plane of the No. 1 coil intersects the geometric center axis of the measured line, the extension plane of the coil plane of the No. 2 coil is perpendicular to the direction of the measured line and is located yOz On the plane, the extension plane of the coil plane of the No. 3 coil is parallel to the plane where the measured line is located.

4. The current measurement method of a non-closed loop strong anti-interference novel current sensor according to claim 3, characterized in that: The inductive voltage of the No. 1 coil is measured in step S3 , the inductive voltage of the No. 2 coil is , and the inductive voltage of the No. 3 coil is .

5. The current measurement method of a non-closed loop strong anti-interference novel current sensor according to claim 4, characterized in that: In the step S4, the specific steps are as follows: Set is the angular frequency, s1, s2 and s3 are the equivalent areas of the No.1 coil, No.2 coil and No.3 coil respectively; is the tilt angle of the No.1 coil, i.e. the angle between the plane of the No.1 coil and the axis of the magnetic field; the central point normal vector of the plane of the No.1 coil is z 1 (0, cos n , sin θ ); θ The central point normal vector of the plane of the No.2 coil is n 2(0,-1,0), and the central point normal vector of the No.3 coil is n 3(0,0,1); the interference magnetic field at the central point of the coil is B s B sx ，B sy ，B sz ;​ The magnetic field generated by the measured line at the center point of the coil is calculated by the induced voltage of the coil B i ( B ix , B iy , B iz ): ， 。 6. The current measurement method of a non-closed loop strong anti-interference novel current sensor according to claim 5, characterized in that: The step S4, according to the matrix operation calculation , get the coil center point of the interference magnetic field B s And the measured current generated magnetic field component .

7. The current measurement method of a non-closed loop strong anti-interference novel current sensor according to claim 1, characterized in that: In the step S5, the specific steps are as follows: The cross section of the measured line is rectangular, and the cross-sectional area of the rectangle is A, the length is a , and the width is b ; the magnetic field generated by the line current at the center point of the cross section above the measured line (0, 0, h ) is B o , the magnetic field generated by the line current at the upper right corner of the rectangular cross section (0, a / 2, b / 2) above the measured line (0, 0, h ) is B e Therefore: ， ， ， ， ， ； Let the height h at be h ; assuming an error of less than one percent, then : ， Set , Here is the binomial expansion, ， ， ， ， i.e. when the error is less than one percent, and The skin effect of the rectangular cross-section conductor is ignored, and the rectangular cross-section conductor is equivalent to a current-carrying conductor with a geometric center at the coordinate origin.

8. The current measurement method of a non-closed loop strong anti-interference novel current sensor according to claim 5 or 7, characterized in that: In the step S6, the specific steps are as follows: is the vacuum permeability, is the magnetic field strength produced by the coil center point of the measured line at (0, 0, h ) The measured current is calculated as follows: 。 9. A current measurement system of a non-closed loop strong anti-interference novel current sensor, characterized in that: The coordinate establishing submodule is configured to set a center point of a section of the measured line as an origin O A three-dimensional rectangular coordinate system is established, and a direction of the measured line is x An axis is perpendicular to x A conductor section of the axis is yOz A length and a width of the rectangular conductor section are parallel to the axis and the axis, respectively y The axis and z The axis The coil setting sub-module is used for placing three coils respectively at a certain height directly above the measured line; the extension planes of the coils respectively intersect with the geometric center axis of the measured line and are located on the plane perpendicular to the direction of the measured line and parallel to the plane where the measured line is located yOz . xOy The plane where the measured line is located A voltage measurement sub-module is configured to derive the mapping relationship between the induced voltage of the three coils and the measured current based on the electromagnetic field quasi-problem theory; The magnetic field calculation sub-module is used for bringing the induced voltage of the coil into a mapping relationship formula to calculate the magnetic field generated by the measured line at the coil center point, and the coil center point is located on the axis. z on the axis; A height calculation sub-module is configured to calculate the installation height of the coil according to the rectangular cross-sectional size of the measured line; A current calculation sub-module is configured to calculate the measured current according to the magnetic field generated by the measured line at the center point of the coil and the installation height of the coil.

10. A computer memory, characterized by: The computer program stored in the memory can be executed by the computer processor, and the computer program executes the current measurement method of the non-closed loop strong anti-interference novel current sensor according to any one of claims 1 to 8.

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