CN101162635A - High magnetic-inductive capacity rogowski coil - Google Patents
High magnetic-inductive capacity rogowski coil Download PDFInfo
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- CN101162635A CN101162635A CNA2007100531439A CN200710053143A CN101162635A CN 101162635 A CN101162635 A CN 101162635A CN A2007100531439 A CNA2007100531439 A CN A2007100531439A CN 200710053143 A CN200710053143 A CN 200710053143A CN 101162635 A CN101162635 A CN 101162635A
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- iron core
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Abstract
The invention relates to a high magnetic conductivity Rogowski coil, comprising a frame and a secondary winding, wherein the frame consists of a iron core with air gap; the secondary winding consists of one or more than one PCB board, each PCB board is provided with an electric loop formed by the electric wiring; the iron core of the frame is provided with at least one air gap in which the PCB board is evenly arranged; front ends and back ends of the electric loops of all PCB boards are connected in series, two induced electromotive force terminals are led out from the connected electric loops. The invention not only enlarges the mutual inductance coefficient of the coil, but also enhances the induced electromotive force; because of applying the secondary winding of which the PCB board uses the electric wiring to replace the enamel covered wire, the invention has the advantages of simple production technique and high product reliability, and relatively improves the linear performance and guarantees the consistency.
Description
Technical field
The present invention relates to a kind of coil of measuring the transducer of magnetic field or electric current, specifically, relate to a kind of high magnetic-inductive capacity rogowski coil of the band air-gap iron core based on printed circuit board (PCB) (PCB) technology.
Background technology
Now, people often are confined to hollow coil to the Rogowski coil, and the skeleton of coil is by the natural nonmagnetic substance that is defined as.Mathematically be, hollow coil has great dynamic range, in theory even can think that it forever can be unsaturated, but, hollow coil also has a great shortcoming, and tested rated current is hundreds of ampere-hours, and the output voltage of hollow coil is about tens of millivolts.When hollow coil is connected use as current measuring device with secondary meters such as metering, demonstrations, the electric potential signal of induction must be by corresponding circuit processing and amplifying, and in number of devices huge relatively power industry and industrial quarters, in order to save the useful life of cost and increase instrument, often select passive pointer secondary meter for use, at this moment, the driving force wretched insufficiency of hollow coil, its range of application is greatly limited.In addition on the one hand, at the very little ampere-hours of just counting of tested electric current, the output potential of general hollow coil often is the number microvolts, is difficult to the processing of this small-signal, often can not get gratifying effect, the size that improves its induced potential a kind of ingenious and effective method of can yet be regarded as.Improve in the method for induced potential, the number of turn that strengthens secondary winding is common a kind of, but, because in order to guarantee certainty of measurement, Kojovic Ljubomir.Rogowski coilssuit relay protection and measurement[of power systems] .IEEEComputer Applications in power, 1997,10 (3): 47-52, illustrated in the literary composition that hollow coil has specific (special) requirements to the coiling of secondary winding, the number of turn is many more, be difficult to reach the requirement of coiling more, make that this method is limited.
The design of Rogowski coil is in order to obtain a stable coefficient of mutual inductance M, and its expression formula is:
In the formula, μ is the magnetic permeability of framework material, and N is a coil turn, and h is the coil rack height, and Ra is the skeleton external diameter, R
iBe the skeleton internal diameter.
The skeleton of hollow coil is non-core material, and its magnetic permeability is 4 π * 10
-7, its relative permeability is 1.Improve the output potential of Rogowski coil, the relative permeability that improves framework material is a very effective method.
Summary of the invention
Purpose utilization of the present invention replaces the enamelled wire coil of the secondary winding of traditional winding by hand or mechanical coiling based on electric wiring on the pcb board, overcome the loaded down with trivial details of coil winding in the concrete production, got rid of that coil falls to coat with lacquer short circuit because of enamelled wire or because of hidden danger such as enamelled wire open circuit, in addition, have the very high closeness and the uniformity based on electric wiring on the pcb board, evidence, the improved Rogowski coil linearity has bigger lifting, and the coefficient of mutual inductance of product also more reaches unanimity.The Rogowski coil of band air gap has had relevant patent to report with the Rogowski coil based on pcb board, but this air-gap iron core and PCB technology are combined, thereby the magnetic permeability that can either improve coil increases the induced potential of output, the novel Rogowski coil of the advantage that the production that also can continue simultaneously pure pcb board is simple, high conformity and reliability are high yet there are no report, the Rogowski coil that the present invention relates to has been drawn the advantage of air-gap iron core coil and pure pcb board, great using value is arranged and promote the space.
The invention provides a kind of high magnetic-inductive capacity rogowski coil, this coil comprises skeleton and secondary winding, skeleton is made of the iron core of band air gap, secondary winding is made of the pcb board more than one or, the electric loop of being made up of electric wiring on every pcb board has at least one air gap in the iron core of skeleton, pcb board is placed in the air gap equably, and the electric loop of all pcb boards connected from beginning to end, and draw the terminal of two induced potentials.
Described coil is a kind of coil of measuring alternation or pulse current, irregular electric current, and tested current carrying conductor passes this Rogowski coil along the center, and secondary winding is responded to certain electromotive force, and this electromotive force is directly proportional with tested electric current time differential; The iron core of air gap is circular, rectangle or irregularly shaped.Coil rack is made up of the iron core of band air gap, this iron core cross section equates everywhere, density is even, and make of identical material, can be that silicon steel sheet is also nanocrystalline, amorphous or other high permeability magnetic material, an iron core has an air gap at least, in order to obtain best measurement effect, generally is advisable to open the even number air gap, each air gap length equates and evenly distributes on the core length direction, and each air gap length generally should not surpass the equivalent diameter of iron core cross section.
It is fixed that the number of turn of secondary winding is come according to the size of measured electric current and required output signal, secondary winding is made of one or an above pcb board, the electric loop of forming by electric wiring on every pcb board, some circle coils are arranged on the every pcb board, the electric loop of pcb board connects up at the obverse and reverse of pcb board respectively symmetrically around the geometric center of this pcb board, passes through the via hole of pcb board geometric center electric loop of wiring formation with positive and negative again.Pcb board is rectangle, square, circle, triangle or irregularly shaped, and the shape of the electric wiring on it also is rectangle, square, circle or triangle.Pcb board is double sided board or the plate more than two layers.
Pcb board is placed in the air gap, with all pcb boards formation secondary winding of connecting from beginning to end; The output signal of this Rogowski coil is proportional to tested electric current time differential, its induced potential can carry out integral processing also can be without integral processing, promptly this coil both can be with integrator work also to can work independently, generally speaking, irregular waveform often needs to reduce with integrator, and the periodic waveform such as the more stable sine wave of frequency of rule often do not need to carry out integral processing.
The present invention adopts air-gap iron core to substitute non magnetic skeleton exactly, improve the size of induced potential, the present invention adopts the coil that becomes secondary winding based on electric Wiring structure on the pcb board to the coil of secondary winding coiling, thereby the pcb board of an above electric wiring is carried out the induced potential that can effectively increase the number of turn raising output of coiling connected in series, the pcb board of the electric wiring that is in series is placed on the Rogowski coil of promptly having constructed a high magnetic permeability in the air gap of iron core, simple, and consistency is secure.
In a word, compare with existing Rogowski coil, Rogowski coil of the present invention mainly has following major advantage:
1, adopt air-gap iron core as framework material, the relative permeability of skeleton is greatly improved, and output signal can increase tens of times, and Signal Processing becomes easily, in addition, also provides possible for itself and the supporting use of pointer secondary meter.
2, adopt air-gap iron core as the secondary bobbin, ferromagnetic material has magnet accumulating cap, magnetic flux density almost everywhere in the skeleton equates and the magnetic flux density in the skeleton outer air, so, Rogowski coil of the present invention does not need to follow in the hollow coil about the absolute principle uniformly of secondary coiling, only needs to guarantee that the secondary coiling roughly is evenly distributed in guarantees promptly on the skeleton that the coiling of quantity gets final product by all having about equally on the separated every iron leg core of air gap.
3, each air-gap iron core has an air gap at least, in order to obtain best measurement effect, generally be advisable to open the even number air gap, and the equal in length of each air-gap and evenly distribution, the structure of this symmetrical distribution has reduced leakage field greatly, has guaranteed the constant of relative permeability, and under the bigger situation of tested electric current, can adjust relative permeability by the quantity that increases air gap, guarantee that coil can not make core sataration in normal range of operation.
4, because the magnetic flux density in the air-gap iron core is even, and Rogowski coil of the present invention is compared with hollow coil, is subjected to the influence of lead and coil relative position little, anti-external electromagnetic field interference performance is strong.The air gap tested lead of distribution also can the improvement of symmetry and coil relative position can further improve the problem of position influence by limiting each air gap length, thereby position influence is reduced to minimum measuring the influence that produces.
5, the electric loop series connection be made up of the electric wiring on one or the above pcb board of the coiling of secondary winding constitutes, compare with the secondary coil that adopts the enamelled wire coiling based on the electric wiring on the pcb board, its reliability is higher, avoided because the fault that enamelled wire falls lacquer or breaks and bring, in addition, can simplify production technology to a certain extent, ensure product consistency based on the electric wiring on the pcb board, and its linear properties and temperature stabilization performance all are improved to some extent.
In a word, compare with traditional current transformer based on transformer principle, Rogowski coil of the present invention mainly has following major advantage:
1, because the secondary load resistance of coil is the product of coefficient of self-inductance and tested electric current angular frequency much larger than the equivalent inductive reactance of the coefficient of self-inductance of coil windings, the secondary of coil is output as the induced potential that is directly proportional with tested primary current time differential, be that coil generally is in the open-circuit working state, and the secondary output-current rating of conventional current instrument transformer is 5A or 1A, it is very little generally to be in short circuit operating state or secondary load, be generally several ohm or tens ohm, therefore to compare operating state different for coil of the present invention and traditional current transformer, it is dangerous not have open circuit, safer.
2, because Rogowski coil of the present invention adopts air-gap iron core as framework material, under identical tested electric current and framework material, size situation, compare with iron core-closed, reduced the magnetic flux density in the iron core, therefore compare with traditional current transformer, have smaller volume and weight, will save the consumption of skeleton ferromagnetic material and secondary winding copper cash greatly.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is typical electric wiring and a loop connection diagram on the monolithic pcb board.
Among the figure: 1-iron core, 2-air gap, the secondary winding that electric wiring constitutes on the 3-PCB plate, current carrying conductor of 4-, 5-secondary winding outlet terminal, 6-monolithic pcb board leading-out terminal, the coiling of 7-PCB plate front winding, the coiling of 8-PCB plate reverse side winding, 9-PCB plate via hole, 10-PCB plate body.
Embodiment
The present invention includes skeleton and secondary winding, skeleton is made of the iron core of band air gap, secondary winding is made of the pcb board more than one or, the electric loop of forming by electric wiring on every pcb board, have at least one air gap in the iron core of skeleton, pcb board is placed in the air gap equably, and the electric loop of all pcb boards is connected from beginning to end, and draws the terminal of two induced potentials.
High magnetic-inductive capacity rogowski coil of the present invention adopts air-gap iron core as skeleton, its objective is in order to increase its coefficient of mutual inductance, induced potential is enhanced, employing replaces using the secondary winding of enamelled wire based on the electric wiring on the pcb board, make that production technology is simple, product reliability is high, linear properties promotes to some extent, consistency is more secure, its concrete execution mode is:
1, the design of air-gap iron core.Mainly be the profile of a current carrying conductor and profile and the basic size that physical size is determined the Rogowski coil rack at first, comprise external diameter, internal diameter and the height of skeleton according to concrete applied environment; Then, determine the material of iron core according to the frequency range of survey electric current, medium and low frequency generally adopts silicon steel sheet, generally adopts the good material of frequency performance for the application scenario of very high frequency, such as nanocrystalline or amorphous etc.; At last, select the number of air gap according to the size of primary current, electric current is big more, the air gap number that needs is many more, the physical size of skeleton is big more, and the air gap number that needs is many more, determines that the basis for estimation of the size of the quantity of air gap and each air gap is, when passing to rated current on the current carrying conductor, the magnetic flux density in the skeleton is less than the saturation induction density of selected ferromagnetic material.
2, the design of secondary winding.Because what adopt is air-gap iron core, the secondary coiling does not need to follow absolute principle uniformly, is evenly distributed in the air gap as long as guarantee secondary winding.The number of turn secondary output voltage as required of secondary coiling is determined, determined the concrete parameter of air-gap iron core in the step 1, just can obtain the relative permeability and the skeleton sectional area of air-gap iron core from these parameters, just can calculate the number of secondary coiling according to relative permeability and skeleton sectional area.
3, the making of secondary winding: secondary winding constitutes by being placed on the electric loop that pcb board more than one or in the air gap and the electric wiring on the pcb board thereof form, the electric loop of being made up of electric wiring on every pcb board is with the electric loop of all pcb boards formation secondary winding of connecting from beginning to end.For example, the geometric center that centers on this pcb board connects up symmetrically at the obverse and reverse of pcb board respectively, passes through the via hole of pcb board geometric center electric loop of wiring formation with positive and negative again.
4, the pcb board geometry that constitutes secondary winding is not limit, and can be rectangle, square, circle, triangle etc., and the shape of the electric wiring on it also can be rectangle, square, circle, triangle etc.; Pcb board can be that double sided board also can be a multi-layer sheet, and multi-layer sheet can obtain more number of turns in limited space, thereby the coefficient of mutual inductance that can effectively improve the Rogowski coil improves the output induced potential.
Claims (10)
1. high magnetic-inductive capacity rogowski coil, this coil comprises skeleton and secondary winding, skeleton is made of the iron core of band air gap, secondary winding is made of the pcb board more than one or, the electric loop of forming by electric wiring on every pcb board, it is characterized in that: have at least one air gap in the iron core of skeleton, pcb board is placed in the air gap equably, and the electric loop of all pcb boards connected from beginning to end, and draw the terminal of two induced potentials.
2. high magnetic-inductive capacity rogowski coil according to claim 1 is characterized in that: the iron core of air gap is circle or rectangle.
3. high magnetic-inductive capacity rogowski coil according to claim 1 is characterized in that: the iron core of air gap is irregularly shaped.
4. high magnetic-inductive capacity rogowski coil according to claim 1 is characterized in that: the iron core cross section of air gap equates everywhere, density is even, and makes of identical material.
5. high magnetic-inductive capacity rogowski coil according to claim 1 is characterized in that: the iron core of air gap is silicon steel sheet, nanocrystalline or amorphous high permeability magnetic material.
6. high magnetic-inductive capacity rogowski coil according to claim 1, it is characterized in that: the air gap of opening in the iron core of air gap is the even number air gap, each air gap length equates and evenly distributes on the core length direction, and each air gap length is no more than the equivalent diameter of iron core cross section.
7. high magnetic-inductive capacity rogowski coil according to claim 1, it is characterized in that: the electric loop of pcb board connects up at the obverse and reverse of pcb board respectively symmetrically around the geometric center of this pcb board, passes through the via hole of pcb board geometric center electric loop of wiring formation with positive and negative again.
8. high magnetic-inductive capacity rogowski coil according to claim 1 is characterized in that: pcb board is rectangle, square, circle or triangle, and the shape of the electric wiring on it also is rectangle, square, circle or triangle.
9. high magnetic-inductive capacity rogowski coil according to claim 1 is characterized in that: pcb board is irregularly shaped.
10. high magnetic-inductive capacity rogowski coil according to claim 1 is characterized in that: pcb board is double sided board or the plate more than two layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100531439A CN101162635A (en) | 2007-09-06 | 2007-09-06 | High magnetic-inductive capacity rogowski coil |
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| CNA2007100531439A CN101162635A (en) | 2007-09-06 | 2007-09-06 | High magnetic-inductive capacity rogowski coil |
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| CN101162635A true CN101162635A (en) | 2008-04-16 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030113B (en) * | 2009-10-01 | 2013-04-24 | 徐跃 | Strong electromagnetic propulsion device |
| CN103400680A (en) * | 2013-08-09 | 2013-11-20 | 衡阳一互电气有限公司 | Hollow coil with closed magnetic circuit |
| CN106093826A (en) * | 2016-08-10 | 2016-11-09 | 李蕊名 | A kind of band air-gap iron core current transformer measurement structure |
| WO2018099153A1 (en) * | 2016-11-29 | 2018-06-07 | 杭州海兴电力科技股份有限公司 | Current transformer |
| CN108627568A (en) * | 2018-05-01 | 2018-10-09 | 河南农业大学 | A kind of L-type is wriggled Exciting-simulator system eddy current sensor and its coil winding method |
| CN108627569A (en) * | 2018-05-02 | 2018-10-09 | 河南农业大学 | A kind of triangle circular Exciting-simulator system eddy current sensor and its coil winding method |
| CN108693245A (en) * | 2018-05-01 | 2018-10-23 | 河南农业大学 | A kind of circular formula eddy current sensor and its coil winding method of wriggling of triangle |
| CN108982654A (en) * | 2018-05-01 | 2018-12-11 | 河南农业大学 | A kind of perpendicular type wriggles the winding method of fancy eddy current sensor and its coil |
| CN108982655A (en) * | 2018-05-01 | 2018-12-11 | 河南农业大学 | A kind of T-type wriggles Exciting-simulator system eddy current sensor and its coil winding method |
| CN109100558A (en) * | 2018-06-06 | 2018-12-28 | 中国电力科学研究院有限公司 | A kind of Rogowski coil and current measuring device |
| CN109657386A (en) * | 2018-12-27 | 2019-04-19 | 燕山大学 | The design method of rectangle Helmholtz coil |
| CN109727760A (en) * | 2018-12-29 | 2019-05-07 | 东莞中子科学中心 | A kind of ultra wide band non-invasive current measuring instrument and preparation method thereof |
| CN110836987A (en) * | 2019-11-25 | 2020-02-25 | 新沂市鑫洋电子有限公司 | Manganese-copper shunt of three-phase intelligent electric energy meter and application thereof |
| CN111381084A (en) * | 2020-01-16 | 2020-07-07 | 华中科技大学 | Stray parameter becomes more meticulous adjustable high frequency current sensor |
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- 2007-09-06 CN CNA2007100531439A patent/CN101162635A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030113B (en) * | 2009-10-01 | 2013-04-24 | 徐跃 | Strong electromagnetic propulsion device |
| CN103400680A (en) * | 2013-08-09 | 2013-11-20 | 衡阳一互电气有限公司 | Hollow coil with closed magnetic circuit |
| CN106093826A (en) * | 2016-08-10 | 2016-11-09 | 李蕊名 | A kind of band air-gap iron core current transformer measurement structure |
| WO2018099153A1 (en) * | 2016-11-29 | 2018-06-07 | 杭州海兴电力科技股份有限公司 | Current transformer |
| CN108982655A (en) * | 2018-05-01 | 2018-12-11 | 河南农业大学 | A kind of T-type wriggles Exciting-simulator system eddy current sensor and its coil winding method |
| CN108693245A (en) * | 2018-05-01 | 2018-10-23 | 河南农业大学 | A kind of circular formula eddy current sensor and its coil winding method of wriggling of triangle |
| CN108982654A (en) * | 2018-05-01 | 2018-12-11 | 河南农业大学 | A kind of perpendicular type wriggles the winding method of fancy eddy current sensor and its coil |
| CN108627568A (en) * | 2018-05-01 | 2018-10-09 | 河南农业大学 | A kind of L-type is wriggled Exciting-simulator system eddy current sensor and its coil winding method |
| CN108627569A (en) * | 2018-05-02 | 2018-10-09 | 河南农业大学 | A kind of triangle circular Exciting-simulator system eddy current sensor and its coil winding method |
| CN108627569B (en) * | 2018-05-02 | 2022-04-22 | 河南农业大学 | Triangular surrounding excitation type eddy current sensor and coil winding method thereof |
| CN109100558A (en) * | 2018-06-06 | 2018-12-28 | 中国电力科学研究院有限公司 | A kind of Rogowski coil and current measuring device |
| CN109657386A (en) * | 2018-12-27 | 2019-04-19 | 燕山大学 | The design method of rectangle Helmholtz coil |
| CN109657386B (en) * | 2018-12-27 | 2023-04-07 | 燕山大学 | Design method of rectangular Helmholtz coil |
| CN109727760A (en) * | 2018-12-29 | 2019-05-07 | 东莞中子科学中心 | A kind of ultra wide band non-invasive current measuring instrument and preparation method thereof |
| CN110836987A (en) * | 2019-11-25 | 2020-02-25 | 新沂市鑫洋电子有限公司 | Manganese-copper shunt of three-phase intelligent electric energy meter and application thereof |
| CN110836987B (en) * | 2019-11-25 | 2021-12-24 | 新沂市鑫洋电子有限公司 | Manganese-copper shunt of three-phase intelligent electric energy meter and application thereof |
| CN111381084A (en) * | 2020-01-16 | 2020-07-07 | 华中科技大学 | Stray parameter becomes more meticulous adjustable high frequency current sensor |
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Open date: 20080416 |