CN117706165A - Three-dimensional current measurement probe with shielding based on bipolar structure and testing method - Google Patents
Three-dimensional current measurement probe with shielding based on bipolar structure and testing method Download PDFInfo
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- CN117706165A CN117706165A CN202311726760.6A CN202311726760A CN117706165A CN 117706165 A CN117706165 A CN 117706165A CN 202311726760 A CN202311726760 A CN 202311726760A CN 117706165 A CN117706165 A CN 117706165A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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Abstract
The three-dimensional current measuring probe with shielding based on the bipolar structure comprises three groups of coil clusters, wherein the three groups of coil clusters are mutually orthogonal in position; there is no coupling between every two coil clusters, and two coils in each group of coil clusters are in series connection in electrical structure and have magnetic field coupling; the polarities of the reference magnetic fields of the two coils in each group of coil clusters are opposite, so that a bipolar structure is formed; the input and output terminals of the whole coil are led out from the middle boundary position of the two coils. In the technical scheme provided by the invention, each group of coil clusters consists of two induction square coils with opposite polarities, and a shielding magnetic core is arranged on one surface of each coil cluster; one side of the unshielded magnetic core faces the direction of the current to be tested, so that the current to be tested and the coil are coupled in a flux linkage in the same direction, and the interference of an external magnetic field is avoided to a great extent on one side of the shielding, and meanwhile, the coupling effect between the current to be tested and the test coil can be enhanced due to the fact that the shielding is tightly attached to one side of the coil.
Description
Technical Field
The invention relates to the field of electric engineering current measurement, relates to a measuring probe and a testing method thereof, in particular to a three-dimensional current measuring probe with shielding based on a bipolar structure and a testing method using the measuring probe.
Background
Monitoring alternating currents of various devices in electrical engineering is of great importance for assessing the operating state of the devices. The rogowski coil and the hall sensor based on the electromagnetic induction principle can flexibly cope with different current testing conditions without direct electrical connection with the tested equipment, so that the sensor has wide application fields such as alternating current cables, transformers, reactors, power semiconductor devices and the like. The main problems of the above method are: the electromagnetic interference is easy to be interfered by surrounding electromagnetic fields, particularly for current measurement of electrical equipment in a compact space, electromagnetic interference in different directions in the space is easy to be coupled into a measuring probe, so that larger measuring errors are caused; and the inductive mode has lower coupling coefficient, and more turns are needed to increase the coupling effect between the inductive mode and the current to be measured.
The existing electromagnetic induction type rogowski coil adopts the principle of coupling a multi-turn single coil with a measured current magnetic field, but the measuring mode is easy to couple a space electromagnetic field, so that the measuring error is larger.
Document [1] (Zhu Jin. Design and optimization of double D orthogonal underwater wireless power transmission system [ D ]. University of science and technology, 2021:
44-65.DOI: 10.27157/d.cnki.ghzku.2021.003589.), and the coupling coefficient of the double DD coil with the separation gap and the common DD coil is compared through simulation, the coupling coefficient value of the separation gap is larger than that of the common DD coil, and in operation, the coupling coefficient fluctuation of the separation gap is more stable.
The literature [2] (Feng Hongyun, lin Fei, yang Zhongzhen ] is applied to a navigation and power supply integrated coil research [ J/OL ] of an automatic guided trolley wireless charging system, and an electrotechnical report 1-12[2023-12-12]. Https:// doi.org/10.19595/j.cnki.1000-6753.tces.230831.) provides a control strategy for realizing optimal efficiency by controlling the amplitude proportion of input voltage of a resonant network under the condition of large-range offset of a transmitting end and a receiving end of a magnetic mechanism of a double-D orthogonal wireless power transmission system.
Document [3] (Xu Feifan, wei Shuguang, yuan Dong, etc.. Unmanned platform field wireless charging coil design and optimization analysis [ J/OL ]. Programming of Power, 1-14[2023-12-12]. Http:// kns. Cnki. Net/kcms/detail/12.1420.TM.20231013.1343.002. Html.) proposes a wireless charging coil structure: DAD coils that can implement both wireless power and offset detection. The 400W wireless charging prototype device with the interval of 30mm is built, the navigation performance and the power supply performance of the DAD coil are verified, the DAD coil can indicate the offset direction and the offset size within the offset range of-50 to +50mm, and the efficiency fluctuation is within the range of 5%, so that stable electric energy transmission can be realized.
Document [4] designs a coupling coil with high adaptability which meets the wireless charging of the field land warfare environment, provides an SP-DDP Double-layer combined coil (Double-Layer Coupling Structure with Solenoid Pad and Double-D Pad), realizes the advantage complementation of a Solenoid (SP) coil and a DD (Double-D) coil, optimizes the coil parameters of the structure, and shows that the coil after optimization can realize the characteristics of anti-offset and anti-deflection under the condition that the size of the coil is 200mm multiplied by 7.8mm, the transmission distance is 50mm, the mutual inductance variation amplitude is less than 20% when the X-axis direction is offset by 160mm, and the Y-axis direction is offset by 120 mm.
The above technical solutions are all designed optimally for the coil structure, but are all used for energy transmission, not for measurement, so that a coil structure capable of being used for measurement is needed to be designed.
Disclosure of Invention
In order to solve the defects in the prior art, the invention discloses a three-dimensional current measurement probe with shielding based on a bipolar structure, which has the following technical scheme:
a three-dimensional current measurement probe with shielding based on a bipolar structure is characterized by comprising three groups of coil clusters (each coil cluster refers to two reversely wound rectangular coils), wherein the three groups of coil clusters are mutually orthogonal in position; there is no coupling between every two coil clusters, and two rectangular coils in each coil cluster are in series connection in electrical structure, and there is magnetic field coupling; the polarities of the reference magnetic fields of the two rectangular coils in each group of coil clusters are opposite, so that a bipolar structure is formed; the input terminal and the output terminal of each coil group are led out from the middle boundary position of the two inner rectangular coils.
Preferably, it is: each group of coil clusters is formed by connecting two rectangular coils in series, wherein one surface of each coil is shielded by a shielding magnetic core.
Preferably, it is: during the test, the unshielded side of the coil faces the tested current to ensure the coupling with enough magnetic field.
Preferably, it is: each group of coil clusters is formed by connecting coils in two directions with opposite reference magnetic field polarities in series on space positions, and the coils contain magnetic field shielding, so that the coupling effect between the coils and the current to be measured can be enhanced while the interference of an external magnetic field is weakened.
Preferably, it is: two rectangular coils are closely arranged side by side to form a strip-shaped structure, one surface of each coil is provided with a strip-shaped shielding magnetic core, and the size of each coil is consistent with the surface of the measuring probe with larger area, so that the coil coincides with one surface of the measuring probe.
Preferably, it is: each rectangular coil contains a plurality of turns of coils, so that larger coil self inductance is ensured, the turns of the two rectangular coils are in opposite winding modes at space positions, and when the two rectangular coils are directly connected in series on an electric structure, the directions of magnetic fields are opposite when the two rectangular coils flow in the same direction.
Preferably, it is: the coil cluster equivalent circuit of the current measuring probe is formed by connecting two coupling coils in series, and under the reference of the flux linkage direction, the coupling coefficients of the two coils are positive.
The invention also discloses a method for testing the shielding three-dimensional current measurement probe based on the bipolar structure, which comprises the following steps:
step 1: firstly, calibrating a measuring probe, and obtaining the mutual inductance M between a measured conductor A and a coil cluster A by using simulation or impedance analyzer A Mutual inductance M between the measured conductor B and the coil cluster B B Mutual inductance M between the measured conductor C and the coil cluster C C Because of the orthogonal relationship between every two coil clusters, the mutual inductance is zero.
Step 2: measuring the output voltage of the coil cluster, calculating the current in the coil, measuring the output voltage of the coil cluster A, B, C by using a voltage transformer, and then according to the output voltage V of the coil cluster A, B, C A 、V B And V C The current is calculated using the following formula
Wherein i is A Representing the current, i, of the conductor A under test B Representing the current, i, of the conductor B under test C Representing the current of the conductor C under test.
Advantageous effects
Each coil group consists of two induction square coils with opposite polarities, and a shielding magnetic core is arranged on one surface of each coil group; one side of the unshielded magnetic core faces the direction of the current to be tested, so that the current to be tested and the coil are coupled in a flux linkage in the same direction, and the interference of an external magnetic field is avoided to a great extent on one side of the shielding, and meanwhile, the coupling effect between the current to be tested and the test coil can be enhanced due to the fact that the shielding is tightly attached to one side of the coil.
Drawings
FIG. 1 is a block diagram of a three-dimensional current measurement probe with shielding based on a bipolar structure.
Fig. 2 is an equivalent circuit diagram of a three-dimensional current measurement probe with shielding based on a bipolar structure.
Fig. 3 is a schematic diagram of a three-dimensional current measurement probe with shielding based on a bipolar structure for current testing.
Detailed Description
Example 1
Shown in fig. 1-2. The invention provides a three-dimensional current measuring probe with shielding based on a bipolar structure, which consists of three groups of coil clusters, wherein the three groups of coil clusters are mutually orthogonal in position, each group of coil clusters consists of two rectangular coils, and the two coils are closely arranged side by side to form a square structure. One face of the coil is provided with a square shielding magnetic core, and the size of the square shielding magnetic core is basically consistent with that of the face with larger area of the measuring probe, so that the square shielding magnetic core is overlapped with the face of the measuring probe. Each coil usually contains a plurality of turns to ensure larger coil self-inductance, the turns of the two square coils are wound in opposite ways in space positions, and when the two square coils are directly connected in series in an electrical structure, the directions of magnetic fields are opposite when the two square coils flow in the same direction, so that bipolar coils are formed. The three groups of coil clusters in the probe are mutually orthogonal in position, and no coupling exists between every two groups of coils; the input terminal and the output terminal of each coil group are led out from the middle boundary position of the two inner rectangular coils. From the circuit point of view, the coil cluster equivalent circuit of the current measurement probe provided by the invention is formed by connecting two coupling coils in series, and the coupling coefficients of the two coils are positive under the reference of the flux linkage direction of fig. 1.
Example 2
Fig. 3 is a schematic diagram of a three-dimensional current measurement probe with shielding based on a bipolar structure for current testing. The coil cluster A tests the current direction A, the coil cluster B tests the current direction B, the coil cluster C tests the current direction C, and the currents A, B, C are in an orthogonal relationship with each other. The current probe provided by the invention is parallel to the direction of the current to be measured, and the unshielded side faces the required measuring coil and is parallel to the direction of the current, so that the magnetic field coupling generated by the current to be measured is realized.
A method of testing a shielded bipolar structure based three-dimensional current measurement probe, the method comprising the steps of:
step 1: firstly, calibrating a measuring probe, and obtaining a measured conductor A and a wire by using simulation or impedance analyzer measurementMutual inductance M between loop clusters A A Mutual inductance M between the measured conductor B and the coil cluster B B Mutual inductance M between the measured conductor C and the coil cluster C C Because of the orthogonal relationship between every two coil clusters, the mutual inductance is zero.
Step 2: measuring the output voltage of the coil cluster, calculating the current in the coil, measuring the output voltage of the coil cluster A, B, C by using a voltage transformer, and then according to the output voltage V of the coil cluster A, B, C A 、V B And V C The current is calculated using the following formula
Wherein i is A Representing the current, i, of the conductor A under test B Representing the current, i, of the conductor B under test C Representing the current of the conductor C under test.
The invention is composed of three coil clusters which are mutually orthogonally arranged, and the three coil clusters are not coupled by magnetic fields, so that decoupling measurement is realized, and the coil clusters can realize independent measurement in three orthogonal current directions. In addition, each group of coil clusters adopts a bipolar measuring probe, on one hand, electromagnetic coupling is formed with the current to be measured, and on the other hand, magnetic shielding is used, so that the self-inductance of the measuring probe and the coupling strength between the measuring probe and the current to be measured are increased while the interference of an external magnetic field is avoided.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The three-dimensional current measurement probe with the shielding based on the bipolar structure is characterized by comprising three groups of coil clusters, wherein the three groups of coil clusters are mutually orthogonal in position; there is no coupling between every two coil clusters, and two rectangular coils in each coil cluster are in series connection in electrical structure, and there is magnetic field coupling; the polarities of the reference magnetic fields of the two rectangular coils in each group of coil clusters are opposite, so that a bipolar structure is formed; the input terminal and the output terminal of each coil group are led out from the middle boundary position of the two inner rectangular coils.
2. The shielded bipolar based three-dimensional current measurement probe of claim 1 wherein each set of coil clusters is comprised of two rectangular coils in series, wherein one face of the coil is shielded by a shielding core.
3. A three-dimensional current measuring probe based on a bipolar structure with shielding according to claim 2, characterized in that the non-shielded side of the coil is guaranteed to be coupled with a sufficient magnetic field to the current to be measured during the test.
4. The three-dimensional current measuring probe with shielding based on the bipolar structure according to claim 1, wherein each group of coil clusters is formed by serially connecting rectangular coils with opposite polarities of reference magnetic fields at space positions, and comprises magnetic shielding, so that the coupling effect between the coils and the current to be measured can be enhanced while the interference of external magnetic fields is weakened.
5. A shielded bipolar structured three-dimensional current measurement probe according to claim 2, wherein: two rectangular coils are closely arranged side by side to form a square structure, and one surface of each coil is provided with a square shielding magnetic core, and the size of each square shielding magnetic core is consistent with the surface of the measuring probe with larger area, so that the square shielding magnetic core is overlapped with one surface of the measuring probe.
6. A shielded bipolar structured three-dimensional current measurement probe according to claim 2, wherein: each rectangular coil contains a plurality of turns of coils, so that larger coil self inductance is ensured, the turns of the two rectangular coils are in opposite winding modes at space positions, and when the two rectangular coils are directly connected in series on an electric structure, the directions of magnetic fields are opposite when the two rectangular coils flow in the same direction.
7. A shielded bipolar structured three-dimensional current measurement probe according to claim 2, wherein: the coil cluster equivalent circuit of the current measuring probe is formed by connecting two coupling coils in series, and under the reference of the flux linkage direction, the coupling coefficients of the two coils are positive.
8. A shielded bipolar structured three-dimensional current measurement probe according to claim 1, wherein: the mutual inductance between each coil cluster is zero.
9. A method for testing a three-dimensional current measurement probe based on a bipolar structure with shielding, the method being based on the three-dimensional current measurement probe according to claim 1, characterized in that:
step 1: firstly, calibrating a measuring probe, and obtaining the mutual inductance M between a measured conductor A and a coil cluster A by using simulation or impedance analyzer A Mutual inductance M between the measured conductor B and the coil cluster B B Mutual inductance M between the measured conductor C and the coil cluster C C Because of the orthogonal relationship between every two coil clusters, the mutual inductance is zero;
step 2: measuring the output voltage of the coil cluster, calculating the current in the coil, measuring the output voltage of the coil cluster A, B, C by using a voltage transformer, and then according to the output voltage V of the coil cluster A, B, C A 、V B And V C The current is calculated using the following formula:
wherein i is A Representing the current, i, of the conductor A under test B Representing the current, i, of the conductor B under test C Representing the current of the conductor C under test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311726760.6A CN117706165A (en) | 2023-12-15 | 2023-12-15 | Three-dimensional current measurement probe with shielding based on bipolar structure and testing method |
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| CN202311726760.6A CN117706165A (en) | 2023-12-15 | 2023-12-15 | Three-dimensional current measurement probe with shielding based on bipolar structure and testing method |
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| CN202311726760.6A Pending CN117706165A (en) | 2023-12-15 | 2023-12-15 | Three-dimensional current measurement probe with shielding based on bipolar structure and testing method |
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