CN108982944B - Current measuring method, device and equipment for flat conductor and storage medium - Google Patents
Current measuring method, device and equipment for flat conductor and storage medium Download PDFInfo
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- CN108982944B CN108982944B CN201811002342.1A CN201811002342A CN108982944B CN 108982944 B CN108982944 B CN 108982944B CN 201811002342 A CN201811002342 A CN 201811002342A CN 108982944 B CN108982944 B CN 108982944B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
The invention discloses a current measuring method of a flat conductor, which can calculate the current value of the flat conductor to be measured only by acquiring the magnetic induction intensity of the flat conductor to be measured in the magnetic sensitivity direction of a plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors. For each single-axis magnetic sensor, it is only required to ensure that the connection line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersection line of the plane of the connection line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected and is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connection line. The current measurement can be realized under the condition of avoiding fixing the relative position of the primary loop wire and each single-axis magnetic sensor, and the installation difficulty is reduced. In addition, the invention also discloses a current measuring device, equipment and a storage medium of the flat conductor, and the effects are as above.
Description
Technical Field
The present invention relates to the field of measurement, and in particular, to a method, an apparatus, a device, and a storage medium for measuring a current of a flat conductor.
Background
Cabinet body equipment such as switch board, looped netowrk cabinet, cubical switchboard are used widely in electric power system, and the copper bar of the platykurtic of generally adopting in these cabinet body equipment is as electrically conductive conductor, and the electric current on these copper bars must be one of the measured important parameter in the electric power system, can reflect electric power system's running state, is the indispensable input variable of functions such as electric power system optimization operation, control and protection. Therefore, it is very important to measure the current on the copper bar conductor, and the measurement accuracy and response speed should meet the requirements of different functions of the power system.
When the current of a flat conductor in a power system is measured by using a current transformer and a Hall current sensor, the flat conductor needs to be connected in series into a primary loop, and the current transformer is large in size and inconvenient to install. In recent years, with the development of magnetic sensor technology, magnetic sensors such as anisotropic magnetoresistance, giant magnetoresistance, tunneling magnetoresistance, and the like are introduced into power systems for measuring the current of a flat conductor, although a current sensor manufactured using a single magnetic sensor does not need to be in direct contact with a primary circuit, and does not need an iron core or a magnetic core; however, the relative position of the primary loop conductor and the magnetic sensor must be fixed, that is, the installation requirement for a single magnetic sensor is extremely high, and a slight deviation of installation will affect the measurement result.
Therefore, the problem that how to overcome the problem that when the current of the flat conductor in the power system is measured by using a single magnetic sensor, the measurement accuracy is low due to the large installation difficulty is a problem to be solved urgently by the technical staff in the field.
Disclosure of Invention
The embodiment of the application provides a current measuring method, a current measuring device, current measuring equipment and a storage medium of a flat conductor, and aims to solve the problem that in the prior art, when the current of the flat conductor in a power system is measured by using a single magnetic sensor, the measurement accuracy is low due to high installation difficulty.
In order to solve the above technical problem, the present invention provides a current measuring method for a flat conductor, comprising:
respectively acquiring magnetic induction intensity of a flat conductor to be detected generated in the magnetic sensitivity direction of a plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors;
calculating the current value of the flat conductor to be measured according to each magnetic induction intensity and each relative distance;
the connection line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersection line of the plane of the connection line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected, the plane of the connection line is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connection line.
Preferably, the number of the single-axis magnetic sensors is two, and the two single-axis magnetic sensors are respectively a first single-axis magnetic sensor and a second single-axis magnetic sensor.
Preferably, the respectively obtaining the magnetic induction intensities generated by the flat conductor to be measured in the magnetic sensitivity directions of the plurality of uniaxial magnetic sensors specifically includes:
a first proportionality coefficient of the first uniaxial magnetic sensor and a second proportionality coefficient of the second uniaxial magnetic sensor are measured in advance;
applying a direct-current voltage to the first uniaxial magnetic sensor and the second uniaxial magnetic sensor to acquire a first voltage output by the first uniaxial magnetic sensor and a second voltage output by the second uniaxial magnetic sensor;
and taking the product of the first proportionality coefficient and the first voltage as a first magnetic induction of the first uniaxial magnetic sensor, and taking the product of the second proportionality coefficient and the second voltage as a second magnetic induction of the second uniaxial magnetic sensor.
Preferably, the acquiring the relative distance of each uniaxial magnetic sensor specifically includes:
acquiring a relative distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor by a distance sensor.
Preferably, the calculating the current value of the flat conductor to be measured according to each of the magnetic induction intensities and each of the relative distances specifically includes:
calculating a first current and a second current of the flat conductor to be measured according to a first magnetic induction of the first uniaxial magnetic sensor, a second magnetic induction of the second uniaxial magnetic sensor and a distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor;
iteratively processing the first current and the second current;
calculating the absolute value of the difference value of the first current and the second current after the iterative processing;
selecting a target difference absolute value which is smaller than the difference absolute value of the previous iteration and smaller than the difference absolute value of the next iteration;
and taking the first target current or the second target current corresponding to the target difference absolute value as the current value of the flat conductor to be measured.
In order to solve the above technical problem, the present invention further provides a flat conductor current measuring device corresponding to the flat conductor current measuring method, including:
the acquisition module is used for respectively acquiring the magnetic induction intensity of the flat conductor to be detected in the magnetic sensitivity direction of the plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors;
the calculation module is used for calculating the current value of the flat conductor to be measured according to each magnetic induction intensity and each relative distance;
the connection line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersection line of the plane of the connection line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected, the plane of the connection line is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connection line.
Preferably, the number of the single-axis magnetic sensors is two, and the two single-axis magnetic sensors are respectively a first single-axis magnetic sensor and a second single-axis magnetic sensor.
Preferably, the acquiring module is specifically configured to acquire a relative distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor by a distance sensor.
In order to solve the above technical problem, the present invention further provides a flat conductor current measuring apparatus corresponding to the flat conductor current measuring method, including:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of any one of the above-mentioned methods for measuring the current of a flat conductor.
In order to solve the above technical problem, the present invention further provides a computer-readable storage medium corresponding to the current measuring method for a flat conductor, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of any one of the current measuring methods for a flat conductor.
Compared with the prior art, the current measuring method of the flat conductor provided by the invention has the advantages that the current value of the flat conductor to be measured can be calculated only by acquiring the magnetic induction intensity of the flat conductor to be measured in the magnetic sensitivity direction of the plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors, so that the current of the flat conductor to be measured can be measured. Meanwhile, for each single-axis magnetic sensor, it is only required to ensure that the connection line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersection line of the plane of the connection line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected and is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connection line. When the measuring method is used, the relative position of the primary loop lead and each single-axis magnetic sensor does not need to be fixed, so that the current measurement of the flat conductor to be measured can be realized under the condition of avoiding fixing the relative position of the primary loop lead and each single-axis magnetic sensor, the installation difficulty is further reduced, and the measurement accuracy is improved. In addition, the invention also provides a current measuring device, equipment and a storage medium of the flat conductor, and the effects are as above.
Drawings
Fig. 1 is a flowchart of a method for measuring current of a flat conductor according to an embodiment of the present invention;
FIG. 2 is a schematic view of a flat conductor current measurement according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a relationship between an absolute value of a current difference and an iteration number according to an embodiment of the present invention;
fig. 4 is a schematic composition diagram of a current measuring device for a flat conductor according to an embodiment of the present invention;
fig. 5 is a schematic composition diagram of a current measuring apparatus for a flat conductor according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a method, a device, equipment and a storage medium for measuring the current of a flat conductor, which can solve the problem of low measurement accuracy caused by large installation difficulty when the traditional method for measuring the current of the flat conductor in a power system by using a single magnetic sensor.
In order that those skilled in the art will better understand the concept of the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Fig. 1 is a flowchart of a current measuring method of a flat conductor according to an embodiment of the present invention, as shown in fig. 1, the current measuring method includes:
s101: and respectively acquiring the magnetic induction intensity of the flat conductor to be measured generated in the magnetic sensitivity direction of the plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors.
Specifically, in practical application, a plurality of single-axis magnetic sensors can be provided, and the flat conductor to be tested generates magnetic induction intensity in the magnetic sensitivity direction of each single-axis magnetic sensor; the relative distance between every two single-axis magnetic sensors is the relative distance between any two single-axis magnetic sensors, and the multiple magnetic induction intensities and the multiple relative distances obtained in the step are all the basis for calculating the current value of the flat conductor to be measured.
In addition, it is worth explaining that, when obtaining each magnetic induction intensity and relative distance, each single-axis magnetic sensor does not need to be connected into a primary loop, as long as it is ensured that a connection line of any two single-axis magnetic sensors is perpendicular to a plane where a flat conductor to be measured is located, an intersection line of the plane where the connection line is located and the plane where the flat conductor to be measured is located at a central axis of the flat conductor to be measured and is parallel to a current direction of the flat conductor to be measured, and a magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connection line, so that non-contact installation of each single-axis magnetic sensor is realized, as long as the relative distance between each single-axis magnetic sensor is measured during specific calculation, the relative position of a primary loop wire and each single-axis magnetic sensor does not need.
S102: and calculating the current value of the flat conductor to be measured according to each magnetic induction intensity and each relative distance.
After the magnetic induction intensities and the relative distances are obtained, the current value of the flat conductor to be measured is calculated according to the relative distances and the magnetic induction intensities. In practical applications, a plurality of current values of the flat conductor to be measured may be calculated according to the magnetic induction intensity and the relative distance of any two single-axis magnetic sensors, and then the calculated plurality of current values are processed, for example, an average value or a weighted average value of the plurality of current values is obtained, and finally the average value or the weighted average value is used as a final current value of the flat conductor to be measured. In practical application, the flat conductor to be tested may be in a regular pattern or an irregular pattern.
According to the current measuring method of the flat conductor, provided by the invention, the current value of the flat conductor to be measured can be calculated only by acquiring the magnetic induction intensity of the flat conductor to be measured in the magnetic sensitivity direction of the plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors, so that the current of the flat conductor to be measured can be measured. Meanwhile, for each single-axis magnetic sensor, it is only required to ensure that the connection line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersection line of the plane of the connection line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected and is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connection line. When the measuring method is used, the relative position of the primary loop lead and each single-axis magnetic sensor does not need to be fixed, so that the current measurement of the flat conductor to be measured can be realized under the condition of avoiding fixing the relative position of the primary loop lead and each single-axis magnetic sensor, the installation difficulty is further reduced, and the measurement accuracy is improved.
In order to improve the calculation efficiency and reduce the hardware cost, in addition to the above embodiment, as a preferable implementation, the number of the single-axis magnetic sensors is two, and the two single-axis magnetic sensors are respectively a first single-axis magnetic sensor and a second single-axis magnetic sensor. Specifically, two single-axis magnetic sensors are selected to measure the current value of the flat conductor to be measured, and the specific measurement process will be described in detail below and will not be described any further.
In order to further improve the accuracy of the measurement result, on the basis of the foregoing embodiment, as a preferred implementation manner, the respectively obtaining the magnetic induction intensities generated by the flat conductor to be measured in the magnetic sensitivity directions of the plurality of uniaxial magnetic sensors specifically includes:
a first proportionality coefficient of a first uniaxial magnetic sensor and a second proportionality coefficient of a second uniaxial magnetic sensor are measured in advance;
applying direct-current voltages to the first single-axis magnetic sensor and the second single-axis magnetic sensor to obtain a first voltage output by the first single-axis magnetic sensor and a second voltage output by the second single-axis magnetic sensor;
the product of the first scaling factor and the first voltage is used as a first magnetic induction of the first uniaxial magnetic sensor, and the product of the second scaling factor and the second voltage is used as a second magnetic induction of the second uniaxial magnetic sensor.
Specifically, a first proportionality coefficient of the first uniaxial magnetic sensor and a second proportionality coefficient of the second uniaxial magnetic sensor are measured in advance before the magnetic induction intensities of the first uniaxial magnetic sensor and the second uniaxial magnetic sensor are acquired; the accuracy of first proportionality coefficient and second proportionality coefficient can be promoted, consequently combine first proportionality coefficient and first voltage to determine the first magnetic induction of first unipolar magnetic sensor, the second magnetic induction of the second unipolar magnetic sensor that combines second proportionality coefficient and second voltage to determine is more accurate, so more be favorable to obtaining more accurate measuring result. In addition, it should be noted that, in order to obtain a more accurate measurement result, a certain stability of the dc voltage applied to the first uniaxial magnetic sensor and the second uniaxial magnetic sensor should be ensured.
In order to make the measurement method of the embodiment of the present application more intelligent and flexible and further improve the accuracy of the measurement result, on the basis of the above embodiment, as a preferred implementation, the obtaining of the relative distance of each single-axis magnetic sensor specifically includes:
the distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor is acquired by a distance sensor.
In the embodiment, the distance sensor is directly used for acquiring the relative distance between the first single-axis magnetic sensor and the second single-axis magnetic sensor, so that the measurement accuracy is higher compared with the method for manually measuring the relative distance between the first single-axis magnetic sensor and the second single-axis magnetic sensor by a user; compared with the preset distance value, when the current of the flat conductor to be measured is measured, the flexibility is higher in the aspect that the relative distance between the first single-axis magnetic sensor and the second single-axis magnetic sensor is required to be the preset distance value. Of course, the selection of the distance sensor to measure the relative distance between the first single-axis magnetic sensor and the second single-axis magnetic sensor is only a preferred way, and does not represent only this way, and in practical applications, the relative distance between the first single-axis magnetic sensor and the second single-axis magnetic sensor may also be measured by a ruler or the like, and specifically, what kind of device is selected to measure the relative distance between the first single-axis magnetic sensor and the second single-axis magnetic sensor, and the invention is not limited.
In order to further improve the accuracy of the current measurement result, on the basis of the foregoing embodiment, as a preferred implementation manner, the calculating the current value of the flat conductor to be measured according to each magnetic induction and each relative distance specifically includes:
calculating a first current and a second current of the flat conductor to be measured according to the first magnetic induction of the first single-axis magnetic sensor, the second magnetic induction of the second single-axis magnetic sensor and the relative distance between the first single-axis magnetic sensor and the second single-axis magnetic sensor;
performing iterative processing on the first current and the second current;
calculating the absolute value of the difference value of the first current and the second current after the iterative processing;
selecting a target difference absolute value which is smaller than the difference absolute value of the previous iteration and smaller than the difference absolute value of the next iteration;
and taking the first target current or the second target current corresponding to the target difference absolute value as the current value of the flat conductor to be measured.
Specifically, two current values (a first current and a second current) of the flat conductor to be measured are obtained by using a first uniaxial magnetic sensor and a second uniaxial magnetic sensor, and in order to improve the accuracy of a current measurement result, iteration processing can be performed on the first current and the second current, that is, the relative distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor is changed, a first target current and a second target current are determined, and finally the first target current or the second target current is used as the final current value of the flat conductor to be measured.
In order to make those skilled in the art better understand the technical solution provided by the present invention, the following describes in detail the measurement process of the current value of the flat conductor to be measured in the present invention by taking two single-axis magnetic sensors as an example with reference to the accompanying drawings. Fig. 2 is a schematic view illustrating a current measurement of a flat conductor according to an embodiment of the present invention. As shown in fig. 2, 20 in fig. 2 denotes a first uniaxial magnetic sensor, 21 denotes a second uniaxial magnetic sensor, and the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21 are arranged along a straight line in space; theThe straight line is perpendicular to the plane of the flat conductor to be measured, the intersection line of the plane of the straight line and the plane of the flat conductor 22 to be measured is located at the central axis of the flat conductor 22 to be measured and is parallel to the current direction of the flat conductor 22 to be measured, and the magnetic sensitivity directions of the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21 are perpendicular to the current direction of the flat conductor to be measured and the straight line formed by the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21. y is1Is the distance, y, of the first uniaxial magnetic sensor 20 from the flat conductor 22 to be measured2The distance between the second uniaxial magnetic sensor 21 and the flat conductor 22 to be measured, d the distance between the first uniaxial magnetic sensor 20 and the second magnetic sensor 21, a the width of the flat conductor 22 to be measured, and θ the included angle between the position of the first uniaxial magnetic sensor 20 and the intersection point K of the central axis X of the flat conductor 22 to be measured and the flat conductor 22 to be measured. During specific installation, the relative position between the primary loop wire and the first single-axis magnetic sensor 20 and the relative position between the primary loop wire and the second single-axis magnetic sensor 21 do not need to be fixed, the installation is simple, and during actual measurement and calculation, the current value of the flat conductor 22 to be measured can be calculated by utilizing the relative distance between the first single-axis magnetic sensor 20 and the second single-axis magnetic sensor 21, the corresponding magnetic induction intensity and the size of the flat conductor 22 to be measured.
Firstly, a calculation formula of the current of the flat conductor 22 to be measured is derived, the flat conductor 22 to be measured is divided into an infinite number of strips with the width dx, and then the current of each strip is dI ═ I · dx/a, and then the magnitude of the magnetic induction intensity generated by the current on the strip at the position x away from the axial plane (the plane where the connecting line of the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21 is located) in the flat conductor 22 to be measured at the position of the first uniaxial magnetic sensor is:
from the symmetry, Σ dByTherefore, only the magnetic induction in the x-axis direction needs to be solved:
therefore, the magnetic induction at the first uniaxial magnetic sensor 20 is:
the same can be said that the magnetic induction intensity at the second uniaxial magnetic sensor 21 is
Next, calculating the current value of the flat conductor 22 to be measured, assuming that the distance from the first uniaxial magnetic sensor 20 to the flat conductor 22 to be measured is smaller than the distance from the second uniaxial magnetic sensor 21 to the flat conductor 22 to be measured, the following steps are performed:
y2-y1＝d (5)
wherein, I is the current of the flat conductor to be solved and is an unknown quantity; b is1、B2The magnetic induction intensities measured for the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21, respectively, are known quantities; y is1The distance from the first uniaxial magnetic sensor to the flat conductor 22 to be measured is an unknown quantity; y is2The distance from the second uniaxial magnetic sensor 21 to the flat conductor 22 to be measured is an unknown quantity; a is the width of the flat conductor 22 to be measured, and is a known quantity; d is a distance between the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21, and is a known quantity; mu.s0Is the vacuum permeability, is a known constant; pi is the circumferential ratio, a known constant.
The measured current I can be obtained by the joint type (3) to the formula (5). The solving steps are as follows:
the method comprises the following steps: let y1＝0；
Step two: y is calculated from equation (5)2；
In practical application, let y also1Other values are possible, of course, y can be2Then according to equation (5) to calculatey1The specific implementation can be determined according to actual conditions, and the invention is not limited.
Step three: calculating the measured current according to formula (3) using I1Represents;
step four: calculating the measured current according to formula (4) using I2Represents;
step five: calculation of I1And I2Is given by Δ I ═ I1-I2And | represents that if the formula (6) is satisfied, the solving process is ended, and if the formula (6) is not satisfied, the iteration is continued.
Δ I (n) < Δ I (n-1) and Δ I (n) < Δ I (n +1) (6)
In the formula (6), n is minimum 2, and the delta I (n-1), the delta I (n), and the delta I (n +1) are I obtained by (n-1), n, and (n +1) times of iterative computation respectively1And I2The absolute value of the difference of (a). If equation (6) is not satisfied, let y1(n+1)＝y1(n)+Δy1(y1(n +1) is y of the n +1 th iteration1Value of (a), y1(n) is y of the nth iteration1Value of (a) Δ y1For preset y per iteration1Increment) and then returning to the step two to continue the execution until the solving process is finished. Finally, the first target current I corresponding to Δ I (n) in the formula (6) will be satisfied1(n) or a second target current I2(n) as the final current value I of the flat conductor 22 to be measured. I is1(n) is I obtained by nth iteration calculation1，I2(n) is I obtained by nth iteration calculation2I.e. the solution I of the measured current.
When the number of the single-axis magnetic sensors exceeds 2, the current calculation process of the flat conductor 22 to be measured is similar to the above process, except that at this time, any two single-axis magnetic sensors are required to calculate multiple groups of first target currents and second target currents, the first currents and the second currents in each group can be subjected to the above iterative processing to obtain corresponding first target currents and second target currents, the specific process is not repeated here, the first target currents and the second target currents in the multiple groups are finally processed (averaging or weighting averaging, and averaging or weighting averaging is performed), and the first target currents and the second target currents after final averaging or weighting averaging are used as final current values of the flat conductor 22 to be measured. For example, there are three single-axis magnetic sensors, i.e., a single-axis magnetic sensor a, a single-axis magnetic sensor B, and a single-axis magnetic sensor C, first a first set of first and second currents is obtained by the single-axis magnetic sensor a and the single-axis magnetic sensor B, second a second set of first and second currents is obtained by the single-axis magnetic sensor a and the single-axis magnetic sensor C, third a set of first and second currents is obtained by the single-axis magnetic sensor B and the single-axis magnetic sensor C, the first and second currents in the three sets are processed to obtain first and second target currents in the corresponding three sets, an average or weighted average of the first and second target currents in the three sets is obtained, and the average or weighted average of the final first target currents is used as the final current value of the flat conductor 22 to be measured, or the average or weighted average of the final second target currents is used as the final current value of the flat conductor 22 to be measured The value is obtained.
The following describes a scheme provided by the present invention in a specific application scenario.
Assuming that the width of the flat conductor 22 to be measured is 200mm and the thickness is 1mm, the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21 are mounted as shown in fig. 2, and the distance between the first uniaxial magnetic sensor 20 and the flat conductor to be measured is y1The distance between the second uniaxial magnetic sensor 21 and the flat conductor to be measured is y, which is 20mm2If the current in the flat conductor to be measured is 100A at 30mm, the magnetic induction B at the position of the first uniaxial magnetic sensor 20 is obtained by simulation with Ansys Maxwell 16.0 software in the embodiment of the present application1＝2.7470244500496890×10-4Magnetic induction B of the position of the second uniaxial magnetic sensor 212＝2.5589329431267182×10-4. Presetting y of each iteration1Delta of Δ y1Which is 0.1mm, and the distance between the first uniaxial magnetic sensor 20 and the second uniaxial magnetic sensor 21 is 10mm, the iteration results of the current values of the flat conductor 22 to be measured obtained by the scheme provided by the present invention are shown in table 1.
TABLE 1
Fig. 3 is a schematic diagram of a relationship between an absolute value of a current difference and an iteration number according to an embodiment of the present invention, as shown in fig. 3 and table 1. When the iteration number n is 200, the absolute value Δ I of the current difference reaches the minimum value of 0.0001017, and in practical application, Δ I may be selected to be 0.000102, so I is taken199.93813A or I2When 99.93824A is the measured value of the current of the flat conductor, the measurement error is 0.06187% (taking I)199.93813 a) or 0.06176% (taking I)299.93824a for the measurement).
The above detailed description is directed to an embodiment of a method for measuring current of a flat conductor, and based on the method for measuring current of a flat conductor described in the above embodiment, an embodiment of the present invention further provides a device for measuring current of a flat conductor corresponding to the method. Since the embodiment of the apparatus portion and the embodiment of the method portion correspond to each other, the embodiment of the apparatus portion is described with reference to the embodiment of the method portion, and is not described again here.
Fig. 4 is a schematic composition diagram of a current measuring apparatus for a flat conductor according to an embodiment of the present invention, and as shown in fig. 4, the current measuring apparatus includes an obtaining module 401 and a calculating module 402.
An obtaining module 401, configured to obtain magnetic induction intensities generated by the flat conductor to be detected in the magnetic sensitivity directions of the multiple single-axis magnetic sensors and relative positions between the single-axis magnetic sensors respectively;
a calculating module 402, configured to calculate a current value of the flat conductor to be measured according to each magnetic induction intensity and each relative position;
the connecting line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersecting line of the plane of the connecting line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected and is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity directions of the single-axis magnetic sensors are perpendicular to the current direction and the connecting line.
According to the current measuring device for the flat conductor, the current value of the flat conductor to be measured can be calculated only by acquiring the magnetic induction intensity of the flat conductor to be measured in the magnetic sensitivity direction of the plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors, and the current of the flat conductor to be measured is measured. Meanwhile, for each single-axis magnetic sensor, it is only required to ensure that the connection line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersection line of the plane of the connection line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected and is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connection line. When the measuring device is installed, the relative position of the primary circuit lead and each single-axis magnetic sensor does not need to be fixed, so that the current measurement of the flat conductor to be measured can be realized under the condition of avoiding the relative position of the primary circuit lead and each single-axis magnetic sensor, the installation difficulty is reduced, and the measurement accuracy is improved.
In addition to the above-described embodiments, as a preferred embodiment, the number of the uniaxial magnetic sensors is two, and the two uniaxial magnetic sensors are a first uniaxial magnetic sensor and a second uniaxial magnetic sensor.
On the basis of the above-described embodiment, as a preferred implementation, the acquisition module is specifically configured to acquire the distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor by using the distance sensor.
The above detailed description is directed to an embodiment of a method for measuring current of a flat conductor, and based on the method for measuring current of a flat conductor described in the above embodiment, an embodiment of the present invention further provides a current measuring apparatus of a flat conductor corresponding to the method. Since the embodiment of the device part and the embodiment of the method part correspond to each other, the embodiment of the device part is described with reference to the embodiment of the method part, and is not described again here.
Fig. 5 is a schematic composition diagram of a current measuring apparatus for a flat conductor according to an embodiment of the present invention, and as shown in fig. 5, the current measuring apparatus includes a memory 501 and a processor 502.
A memory 501 for storing a computer program;
a processor 502 for executing a computer program to implement the steps of the current measuring method of the flat conductor provided in any of the above embodiments.
According to the current measuring equipment for the flat conductor, when the current measuring equipment is installed, the relative position of the primary loop lead and each single-axis magnetic sensor does not need to be fixed, so that the current measurement of the flat conductor to be measured can be realized under the condition that the relative position of the primary loop lead and each single-axis magnetic sensor is not fixed by using the current measuring equipment, the installation difficulty is further reduced, and the measurement accuracy is improved.
The above embodiment of the method for measuring the current of the flat conductor is described in detail, and based on the method for measuring the current of the flat conductor described in the above embodiment, the embodiment of the present invention also provides a computer readable storage medium corresponding to the method. Since the embodiment of the computer-readable storage medium portion and the embodiment of the method portion correspond to each other, please refer to the embodiment of the method portion for describing the embodiment of the computer-readable storage medium portion, which is not described herein again.
A computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the steps of the method for measuring current of a flat conductor provided in any one of the above embodiments.
In the computer-readable storage medium provided by the invention, the processor can read a program stored in the readable storage medium, that is, the current measuring method for the flat conductor provided by any one of the embodiments can be realized, and when the method is installed, the relative position of the primary loop lead and each single-axis magnetic sensor does not need to be fixed, so that the current measurement for the flat conductor to be measured can be realized under the condition of avoiding fixing the relative position of the primary loop lead and each single-axis magnetic sensor, thereby reducing the installation difficulty and improving the measurement accuracy.
The present invention provides a method, an apparatus, a device and a storage medium for measuring current of a flat conductor. The principles and embodiments of the present invention have been described herein using several examples, the above description of which is only intended to facilitate the understanding of the method and its core concepts of the present invention; meanwhile, for those skilled in the art, based on the idea of the present invention, there may be variations in the specific embodiments and applications, and in summary, the present disclosure should not be construed as a limitation of the present invention, and those skilled in the art should include modifications, equivalent substitutions, improvements and the like without inventive labor.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the term "comprises/comprising" and the like, such that a unit, device or system comprising a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such unit, device or system.
Claims (7)
1. A method of measuring current in a flat conductor, comprising:
respectively acquiring magnetic induction intensity of a flat conductor to be detected generated in the magnetic sensitivity direction of a plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors;
calculating the current value of the flat conductor to be measured according to each magnetic induction intensity and each relative distance;
the connecting line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersecting line of the plane of the connecting line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected and is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connecting line;
the number of the single-axis magnetic sensors is two, and the two single-axis magnetic sensors are respectively a first single-axis magnetic sensor and a second single-axis magnetic sensor;
the calculating the current value of the flat conductor to be measured according to each magnetic induction and each relative distance specifically includes:
calculating a first current and a second current of the flat conductor to be measured according to a first magnetic induction of the first uniaxial magnetic sensor, a second magnetic induction of the second uniaxial magnetic sensor and a relative distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor;
iteratively processing the first current and the second current;
calculating the absolute value of the difference value of the first current and the second current after the iterative processing;
selecting a target difference absolute value which is smaller than the difference absolute value of the previous iteration and smaller than the difference absolute value of the next iteration;
taking the first target current or the second target current corresponding to the target difference absolute value as the current value of the flat conductor to be tested;
the basis first magnetic induction of first unipolar magnetic sensor, the second magnetic induction of second unipolar magnetic sensor and first unipolar magnetic sensor with relative distance between the second unipolar magnetic sensor calculates the first electric current and the second electric current of the flat conductor that awaits measuring specifically are:
and simultaneously solving a first current and a second current of the flat conductor to be tested according to the following three formulas:
y2-y1＝d；
wherein the content of the first and second substances,
wherein, let y1Or y2At a predetermined value, B1Is the magnetic induction at the first uniaxial magnetic sensor, dBxFor the magnetic induction, mu, in the x-axis direction of the flat conductor to be measured0For vacuum permeability, I is the current of the flat conductor to be measured, y1Is the distance from the first uniaxial magnetic sensor closer to the flat conductor to be measured, y2The distance from the second uniaxial magnetic sensor to the flat conductor to be measured is defined as a, the width of the flat conductor to be measured is defined as d, the distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor is defined as d, and the distance from dx distributed along the y axis of the flat conductor to be measured to the middle axial plane of the flat conductor to be measured is defined as x.
2. The method for measuring the current of the flat conductor according to claim 1, wherein the step of respectively obtaining the magnetic induction intensities of the flat conductor to be measured generated in the magnetic sensitivity directions of the plurality of uniaxial magnetic sensors specifically comprises:
a first proportionality coefficient of the first uniaxial magnetic sensor and a second proportionality coefficient of the second uniaxial magnetic sensor are measured in advance;
applying a direct-current voltage to the first uniaxial magnetic sensor and the second uniaxial magnetic sensor to acquire a first voltage output by the first uniaxial magnetic sensor and a second voltage output by the second uniaxial magnetic sensor;
and taking the product of the first proportionality coefficient and the first voltage as a first magnetic induction of the first uniaxial magnetic sensor, and taking the product of the second proportionality coefficient and the second voltage as a second magnetic induction of the second uniaxial magnetic sensor.
3. The method for measuring the current of the flat conductor according to claim 1, wherein the obtaining of the relative distance of each uniaxial magnetic sensor is specifically as follows:
acquiring a relative distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor by a distance sensor.
4. A flat conductor current measuring device, comprising:
the acquisition module is used for respectively acquiring the magnetic induction intensity of the flat conductor to be detected in the magnetic sensitivity direction of the plurality of single-axis magnetic sensors and the relative distance between the single-axis magnetic sensors;
the calculation module is used for calculating the current value of the flat conductor to be measured according to each magnetic induction intensity and each relative distance;
the connecting line of any two single-axis magnetic sensors is perpendicular to the plane of the flat conductor to be detected, the intersecting line of the plane of the connecting line and the plane of the flat conductor to be detected is located at the central axis of the flat conductor to be detected, the plane of the connecting line is parallel to the current direction of the flat conductor to be detected, and the magnetic sensitivity direction of each single-axis magnetic sensor is perpendicular to the current direction and the connecting line;
the number of the single-axis magnetic sensors is two, and the two single-axis magnetic sensors are respectively a first single-axis magnetic sensor and a second single-axis magnetic sensor;
the calculating the current value of the flat conductor to be measured according to each magnetic induction and each relative distance specifically includes:
calculating a first current and a second current of the flat conductor to be measured according to a first magnetic induction of the first uniaxial magnetic sensor, a second magnetic induction of the second uniaxial magnetic sensor and a relative distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor;
iteratively processing the first current and the second current;
calculating the absolute value of the difference value of the first current and the second current after the iterative processing;
selecting a target difference absolute value which is smaller than the difference absolute value of the previous iteration and smaller than the difference absolute value of the next iteration;
taking the first target current or the second target current corresponding to the target difference absolute value as the current value of the flat conductor to be tested;
the basis first magnetic induction of first unipolar magnetic sensor, the second magnetic induction of second unipolar magnetic sensor and first unipolar magnetic sensor with relative distance between the second unipolar magnetic sensor calculates the first electric current and the second electric current of the flat conductor that awaits measuring specifically are:
and simultaneously solving a first current and a second current of the flat conductor to be tested according to the following three formulas:
y2-y1＝d；
wherein the content of the first and second substances,
wherein, let y1Or y2At a predetermined value, B1Is the magnetic induction at the first uniaxial magnetic sensor, dBxFor the magnetic induction, mu, in the x-axis direction of the flat conductor to be measured0For vacuum permeability, I is the current of the flat conductor to be measured, y1Is the distance from the first uniaxial magnetic sensor closer to the flat conductor to be measured, y2The distance from the second uniaxial magnetic sensor to the flat conductor to be measured is defined as a, the width of the flat conductor to be measured is defined as d, the distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor is defined as d, and the distance from dx distributed along the y axis of the flat conductor to be measured to the middle axial plane of the flat conductor to be measured is defined as x.
5. The device for measuring the current of the flat conductor according to claim 4, wherein the obtaining module is specifically configured to obtain the relative distance between the first uniaxial magnetic sensor and the second uniaxial magnetic sensor by a distance sensor.
6. A flat conductor current measuring apparatus, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the method of current measurement of a flat conductor according to any of claims 1 to 3.
7. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program is executed by a processor to implement the steps of the method for current measurement of a flat conductor according to any one of claims 1 to 3.
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| CN111650539A (en) * | 2020-06-08 | 2020-09-11 | 南方电网数字电网研究院有限公司 | Method, system and device for detecting operating parameters of lead and computer equipment |
| CN112964923B (en) * | 2021-02-09 | 2022-07-19 | 华北电力大学 | Non-surrounding type current measuring method based on magnetic sensor array |
| CN114487559B (en) * | 2022-04-02 | 2022-07-12 | 南方电网数字电网研究院有限公司 | Flat conductor current measuring method, flat conductor current measuring device, computer equipment and storage medium |
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