CN116068247B - Rogowski coil type current sensor - Google Patents
Rogowski coil type current sensor Download PDFInfo
- Publication number
- CN116068247B CN116068247B CN202310279682.3A CN202310279682A CN116068247B CN 116068247 B CN116068247 B CN 116068247B CN 202310279682 A CN202310279682 A CN 202310279682A CN 116068247 B CN116068247 B CN 116068247B
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- spiral
- shielding shell
- current sensor
- rogowski coil
- shell
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- 239000002184 metal Substances 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 7
- 230000004044 response Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- 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
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
-
- 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
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a rogowski coil type current sensor, comprising: the spiral shielding shell is made of metal, the whole spiral shielding shell is annular, the section of the spiral shielding shell is spiral, the spiral shielding shell consists of a plurality of layers of shielding shells, and an air gap exists between each layer of shielding shell; wherein, each layer of equidistant first default hole of punching on the casing flush with spiral shielding shell inboard tip, pass the hole with spiral shielding shell's inboard tip and outside tip through inductance connection form a closed circuit. The invention evenly punches holes on the shielding shell, and the inner side end part and the outer side end part of the spiral shielding shell are connected through the holes to form a closed loop through the inductor, and the inductor loop is actually changed into a coil.
Description
Technical Field
The invention relates to the technical field of electricity, in particular to a Rogowski coil type current sensor.
Background
At present, in the power grid, the off-line detection method cannot meet the requirements of the current power grid on safety and reliability, and on-line monitoring is imperative. One of the important problems encountered in on-line monitoring is how to accurately acquire the frequency response signal.
In the related art, a current sensor is generally adopted to collect current signals for on-line monitoring, and the power frequency interference of the field test environment is large, the current signals collected by the current sensor are superposition of power frequency signals and 1kHz-1MHz frequency response signals (high frequency signals), so that high-pass filtering is needed to obtain the 1kHz-1MHz frequency response signals required for research.
In the related art, the high-pass filtering mode is mainly active filtering, and is generally used for providing a power frequency load on a sensor, so that the nonlinear characteristic of the load is required to be very outstanding, the impedance is almost zero at the power frequency, and the impedance is very high at the high frequency. The ideal load is a power frequency resonance type load, taking second order resonance as an example, if the impedance of a resonant circuit at 50Hz is required to be 100W, the impedance reaches more than 200k ohms at 10 kHz:，/>the method comprises the steps of carrying out a first treatment on the surface of the Solving to obtain、/>L is inductance, C is capacitance, ">Is the unit of capacitance. Therefore, if the power frequency magnetic field and the high frequency magnetic field are coupled together to the sensor and then filtered, a large inductance is required, the inductance of the large scale is difficult to manufacture, and the power frequency magnetic field is eliminated in the wayAnd (3) the energy-saving type solar cell module is economical.
Disclosure of Invention
In order to solve the technical problems, the invention provides a rogowski coil type current sensor.
The technical scheme adopted by the invention is as follows:
an embodiment of the present invention proposes a rogowski coil type current sensor including: the spiral shielding shell is made of metal, is annular in whole and is spiral in section, and consists of multiple layers of shielding shells, and an air gap exists between each layer of shielding shells; wherein, each layer is equidistant to beat first preset quantity hole on the casing flush with spiral shielding shell inboard tip, pass the hole with spiral shielding shell inboard tip and outside tip through inductance connection form a closed loop.
The rogowski coil type current sensor provided by the invention can also have the following additional technical characteristics:
according to one embodiment of the invention, the first preset number is 90.
According to one embodiment of the invention, the inductance has a value of 0.1mH.
According to one embodiment of the present invention, the metal material includes: iron.
The invention has the beneficial effects that:
the invention evenly punches holes on the shielding shell, and the inner side end part and the outer side end part of the spiral shielding shell are connected through the holes to form a closed loop through the inductor, and the inductor loop is actually changed into a coil, and can be regarded as a coil with low impedance for a power frequency signal due to the characteristic that the inductor passes through low frequency resistance and high frequency, and can be regarded as an open circuit for a high frequency signal in an ideal state, thereby realizing the function of high-pass filtering, fully playing the role of the spiral shielding shell, and realizing the high-pass filtering of a measurement signal besides shielding an external interference magnetic field.
The shielding shell is uniformly perforated, and a loop formed by the shell and the inductor is also uniform, so that the power frequency magnetic field induced by each coil can be tightly attached to the magnetic core of the current sensor by the uniform distribution structure, and the power frequency magnetic field generated by the measured current around the sensor can be completely counteracted, so that the power frequency signal output by the sensor is almost 0; the loops formed by the shell and the inductor are uniformly distributed along the axial direction of the shielding shell, and the structure ensures that the power frequency current coupled on the shell flows uniformly along the shell without generating current aggregation, and the current flowing through each loop is not too large, so that the inductor of the conventional type on the market of the inductor element connected on the loop can meet the requirements without special customization, and the cost is greatly reduced.
Drawings
Fig. 1 is a schematic structural view of a rogowski coil type current sensor according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a spiral shield shell at a perforation in accordance with one embodiment of the present invention;
fig. 3 is a schematic view of a split unit of a spiral shield case according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 3, the rogowski coil type current sensor according to the present invention includes: the spiral shielding shell 1 is made of metal, the whole spiral shielding shell 1 is annular, the section of the spiral shielding shell is spiral, the spiral shielding shell consists of a plurality of layers of shielding shells, and an air gap exists between each layer of shielding shell; wherein a first predetermined number of holes 3 are drilled in each layer equidistant from the housing flush with the inner end 2 of the spiral-shaped shielding shell, and the inner end 2 and the outer end 4 of the spiral-shaped shielding shell are connected through the holes 3 by an inductor 5 to form a closed loop 6.
In one embodiment of the present invention, the first preset number may be 90. The value of the inductance 5 may be 0.1mH, the number of inductances 90, the maximum through-flow 6A. The metal material may include: iron.
Specifically, a schematic cross-sectional view of a hole of the spiral shield case may be shown with reference to fig. 2, and a schematic structure of one split unit of the spiral shield case may be shown with reference to fig. 3. The invention can realize the purpose of filtering the power frequency component with larger content in the detected signal through the spiral shielding shell 1. As shown in fig. 3, the connection of the shielding shell 1 through the inductor 5 actually becomes a coil, and the spiral structure corresponds to increasing the number of turns of this coil. The measured current comprises a power frequency component and a frequency response component (high-frequency signals of 1kHz-1 MHz), and signals with different frequencies meet the superposition theorem, so that the two signals can be analyzed separately, and when the measured current flows through the Rogowski coil type current sensor, each subdivision unit can be regarded as a coil with low impedance due to the characteristic that the inductance element passes through the low frequency resistance and the high frequency. According to the law of electromagnetic induction, each split unit generates a power frequency magnetic field, and the power frequency magnetic field counteracts the power frequency magnetic field generated by the measured current, so that the magnetic flux of the local composite power frequency magnetic field is small. The whole shielding shell forms a plurality of split units which are uniformly distributed on the outer side of the sensor, and the power frequency magnetic field generated by the whole shielding shell is attached to the shape of the magnetic core, so that the power frequency magnetic field at each position of the sensor coil can be well counteracted. In addition, the structure of uniform distribution ensures that the power frequency current coupled on the shell flows uniformly along the shell and does not generate current aggregation, which ensures that the current flowing through a loop formed by each split unit is not too large, thus meeting the requirements of the inductor with the conventional type on the market of the inductance element connected on the loop and greatly reducing the cost without special customization. For the frequency response signal (1 kHz-1 MHz), the loop formed by the split unit is regarded as open circuit in an ideal state due to the characteristic that the inductance element passes through low frequency resistance and high frequency, so that the magnetic flux of the high frequency magnetic field is not weakened and is directly coupled with the coil of the sensor.
Therefore, the rogowski coil type current sensor provided by the embodiment of the invention fully plays the role of the spiral shielding shell, and can shield an external interference magnetic field and realize high-pass filtering of a measurement signal.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A rogowski coil type current sensor, comprising:
the spiral shielding shell is made of metal, is annular in whole and is spiral in section, and consists of multiple layers of shielding shells, and an air gap exists between each layer of shielding shells; wherein,,
each layer of the shell flush with the inner side end of the spiral shielding shell is provided with a first preset number of holes at equal intervals, the inner side end and the outer side end of the spiral shielding shell are connected through the holes through an inductor to form a closed loop, and the first preset number is 90.
2. The rogowski coil type current sensor according to claim 1, characterized in that the value of the inductance is 0.1mH.
3. The rogowski coil current sensor according to claim 1, wherein the metal material comprises: iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310279682.3A CN116068247B (en) | 2023-03-22 | 2023-03-22 | Rogowski coil type current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310279682.3A CN116068247B (en) | 2023-03-22 | 2023-03-22 | Rogowski coil type current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116068247A CN116068247A (en) | 2023-05-05 |
| CN116068247B true CN116068247B (en) | 2023-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310279682.3A Active CN116068247B (en) | 2023-03-22 | 2023-03-22 | Rogowski coil type current sensor |
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| Country | Link |
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| CN (1) | CN116068247B (en) |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1450608A1 (en) * | 1987-05-06 | 1990-09-23 | Korenevskij L N | Induction sensor of variable magnetic field |
| FR2687477B1 (en) * | 1992-02-14 | 1996-06-07 | Abb Petercem | CURRENT SENSOR. |
| US6564084B2 (en) * | 2001-03-02 | 2003-05-13 | Draeger Medical, Inc. | Magnetic field shielding and detecting device and method thereof |
| DE102004022139B4 (en) * | 2004-05-05 | 2007-10-18 | Atmel Germany Gmbh | A method for producing a spiral inductance on a substrate and a device produced by such a method |
| US7501924B2 (en) * | 2005-09-30 | 2009-03-10 | Silicon Laboratories Inc. | Self-shielding inductor |
| GB2463935B (en) * | 2008-10-01 | 2013-06-19 | 3Di Power Ltd | Inductor for high frequency applications |
| CN202093120U (en) * | 2010-12-31 | 2011-12-28 | 保定天威集团有限公司 | Compound sensor for core grounding current and partial discharge signals of transformer |
| US9075091B2 (en) * | 2011-09-09 | 2015-07-07 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| WO2015016742A1 (en) * | 2013-07-30 | 2015-02-05 | Открытое акционерное общество "Акционерная компания по транспорту нефти "Транснефть" (ОАО "АК "Транснефть") | Magnetic measuring system for a flaw detector having longitudinal magnetization |
| GB201400197D0 (en) * | 2014-01-07 | 2014-02-26 | Power Electronic Measurements Ltd | High bandwidth rogowski transducer with screened coil |
| CN104076185A (en) * | 2014-07-17 | 2014-10-01 | 重庆大学 | Differential ring lightning current sensor based on printed circuit board and digital integration |
| CN108663575A (en) * | 2018-04-04 | 2018-10-16 | 中国人民解放军61489部队 | Large-scale shield low-frequency pulse high-intensity magnetic field shield effectiveness test system and test method |
| KR101921291B1 (en) * | 2018-05-11 | 2019-02-13 | (주) 마이크로프랜드 | Semiconductor Device Test Socket |
| EP3851864B1 (en) * | 2018-09-12 | 2023-06-28 | Alps Alpine Co., Ltd. | Magnetic sensor and current sensor |
| CN212341315U (en) * | 2019-08-30 | 2021-01-12 | 中国船舶工业系统工程研究院 | Coaxial disc-shaped water resistor for self-integrating Rogowski coil |
| US12114471B2 (en) * | 2020-07-20 | 2024-10-08 | Arm Limited | Active shield structure |
| CN112034230B (en) * | 2020-07-21 | 2022-10-25 | 华北电力大学 | Current sensor with spiral shielding shell |
| WO2021008637A2 (en) * | 2020-10-12 | 2021-01-21 | 深圳顺络电子股份有限公司 | Stacked shielded inductor |
| CN112665781A (en) * | 2020-12-16 | 2021-04-16 | 广东电网有限责任公司 | Pressure sensing monitoring device |
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2023
- 2023-03-22 CN CN202310279682.3A patent/CN116068247B/en active Active
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