CN102053193A - Current sensor adopting differential coil structure - Google Patents
Current sensor adopting differential coil structure Download PDFInfo
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- CN102053193A CN102053193A CN2009101933293A CN200910193329A CN102053193A CN 102053193 A CN102053193 A CN 102053193A CN 2009101933293 A CN2009101933293 A CN 2009101933293A CN 200910193329 A CN200910193329 A CN 200910193329A CN 102053193 A CN102053193 A CN 102053193A
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- primary current
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- current sensing
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- air core
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Abstract
The invention discloses a current sensor adopting a differential coil structure for eliminating external magnetic field interference. The current sensor comprises a primary current carrier, a primary current sensing unit, a compensating winding, a double-shielding twisted pair and an air plug. The primary current carrier passes through the center of the primary current sensing unit; and the metal shielding shell of the winding, the shielding layer of a signal transmission wire and the metal part of the air plug form a whole to improve the signal-to-noise ratio of secondary signals. The hollow coil has the key technology of improving the noise immunity of power frequency magnetic fields. By improving the internal structure of the coil, adding a loop wire in the coil, manufacturing two hollow coils with consistent structures and performance parameters and counteracting the external magnetic field interference through differential structures connected in series at the corresponding terminals, the secondary output precision of the current sensor meets the requirement of 0.2-level electrical energy metering.
Description
Technical field
What the present invention relates to is the important component part that is used for the electronic current mutual inductor in electric system current measurement and relay protection field, and promptly a kind of air core coil that adopts is the current sensor of sensing unit.
Background technology
Since transformer comes out, the current transformer of electromagnetic type has obtained sufficient development, yet along with continuous increase of electric system transmission capacity and electric pressure constantly improve, electromagnetic current transducer has exposed more and more intrinsic shortcomings, is difficult to satisfy the requirement of power system development.Along with based on the relay protection of microcomputer technology and the widespread use of measuring system, the power demand of input signal is reduced greatly.Bring opportunity in application on power system under this situation, for electronic current mutual inductor.
The most of air core coil that adopts of electronic current mutual inductor is as sensing unit at present, and air core coil has another name called the Rogowski coil, is copper cash is evenly made on non-magnetic conduction skeleton.This coil is not owing to contain iron core, do not have shortcomings such as ferromagnetic saturated, ferroresonance and magnetic hysteresis, and it is good to have the linearity, and measurement range is wide, and the characteristics that transient response characteristic is good are particularly suitable for being applied in the relay protection aspect.But air core coil is subjected to the interference of external magnetic field easily, and the stability of product secondary output is not high, and precision is difficult to realize 0.5 grade or high precision level rank more, can not satisfy the requirement of electric energy metrical.
Summary of the invention
The stability that the objective of the invention is to overcome air core coil secondary output signal is not high, and the deficiency that disturbed by the external magnetic field provides a kind of simple in structure, easy for installation, and precision can realize the current sensor of 0.2 grade employing differential lines coil structures.
The present invention is achieved through the following technical solutions high precision, stable secondary output.The present invention is an inactive component, comprises the primary current carrying object, primary current sensing unit, compensation winding, the aviation plug of double shield twisted-pair feeder and band metallic shield.The primary current carrying object runs through the center of primary current sensing unit, the magnetic flux that primary current produces produces hinge in the primary current sensing unit, produce induction electromotive force by electromagnetic induction at the output terminal of coil, secondary singal is by the array mode output of shielding line and aviation plug.
Described primary current sensing unit is to be combined by at least one air core coil and metal shielding.The compensation winding is identical with the structural parameters of primary current sensing unit, primary current only passes through the center of primary current sensing unit, its central axis was consistent with the center of Secondary Winding when the compensation winding was installed, the end face of coil is parallel, near as far as possible being close together under the situation that guarantees insulation is consistent to guarantee the external magnetic field to the interference of two coils.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is a primary current carrying object structural representation of the present invention
Fig. 3 is an air core coil structural representation of the present invention
Fig. 4 is a coil rack outside drawing of the present invention
Embodiment
As Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, the present invention includes: primary current carrying object 1, primary current sensing unit 2, compensation winding 3, double shield twisted-pair feeder 4, and the aviation plug of band metallic shield constitutes an integral body.
Described primary current carrying object 1 is a winding of single-turn type, is welded by copper bar 5 and Primary Conductor 6, and the size of Primary Conductor 6 is determined by the size and the dynamic and thermal stability current value of rated primary current.
Described primary current sensing unit 2 is fitted together by air core coil 7 and metal shielding, inner available epoxy is filled fixing, the number of turn of air core coil 7 coilings and the size of skeleton 9 are by the size decision of the size and the secondary output signal of the rated primary current effective value of product, metal shielding is the endless metal housing of a sectional area for circle, can select the sheet copper impact briquetting for use, play electric field shielding.
The structure of described compensation winding 3, size and performance parameter are consistent with primary current sensing unit 2, the end of the same name of two winding secondaries output is connected in series, and the different name end is offset the external magnetic field by the differential configuration of twin coil and disturbed by the array mode output of shielding line and aviation plug.
Described air core coil 7 be with material be the enameled wire of copper on the skeleton 9 of non-magnetic conduction evenly coiling form, the material of skeleton 9 can be selected epoxy glass fiber for use, by lathe finishing, make the smooth surface of skeleton 9, and sectional area is even.
When product is installed, on the basis of assurance insulation, Secondary Winding and near as far as possible being installed together of compensation winding 3 make external disturbance magnetic field big or small consistent with the induction electromotive force on the compensation winding 3 in Secondary Winding, direction is opposite, then the interference signals cancel one another of secondary output.
Claims (9)
1. one kind is adopted the differential lines coil structures to get rid of the current sensor that external magnetic field is disturbed, and it has a primary current carrying object (1), and at least one primary current sensing unit (2) and at least one are used to respond to the compensation winding (3) in external disturbance magnetic field.It is characterized in that primary current carrying object (1) vertically runs through the center of primary current sensing unit (2), the magnetic flux that primary current produces is in the internal hinge of primary current sensing unit (2), and the generation induction electromotive force; Do not pass through primary current with compensation winding (3) with the induction external disturbance, install near primary current sensing unit (2) on the basis that guarantees insulation, the output of compensation winding (3) secondary is connected in series with the end of the same name of primary current sensing unit (2) secondary output.
2. according to the primary current carrying object (1) described in the claim 1, it is characterized by it is to be welded by copper bar (5) and Primary Conductor (6), and the sectional area of Primary Conductor (6) is circular, and external form is the conducting rod of U font.
3. according to the compensation winding (3) described in the claim 1, it is characterized in that having and the identical structure of primary current sensing unit (2), and both coefficient of mutual inductance M are identical.
4. according to the compensation winding (3) described in the claim 3, the central axes that it is characterized in that the central axis and the primary current sensing unit (2) of its installation site, and the coil end face of compensation winding (3) is parallel with the end face of primary current sensing unit (2).
5. according to the primary current sensing unit (2) described in the claim 1, it is characterized by it is to be sensing element by having an air core coil (7) at least, and its making is to be that the enameled wire of copper is gone up even coiling at skeleton (9) and formed with material.
6. according to the skeleton described in the claim 5 (9), the manufacturing materials that it is characterized in that skeleton (9) is selected a kind of insulating material of non-magnetic conduction for use, and its magnetoconductivity is space permeability μ
o
7. according to the skeleton described in the claim 5 (9), it is characterized in that its annulus that is shaped as, the inside radius of annulus is R
a, external radius is R
b, sectional area is the circle of a diameter d.
8. according to the air core coil described in the claim 5 (7), a circle and air core coil (7) have been it is characterized by at the internal production of air core coil (7) around to opposite loop line (8).
9. the loop line (8) described in according to Claim 8 is characterized by the center that it is in air core coil (7), is shaped as an annulus, and the radius of annulus is R
c, and make R
c=(R
a+ R
b)/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101933293A CN102053193A (en) | 2009-10-27 | 2009-10-27 | Current sensor adopting differential coil structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101933293A CN102053193A (en) | 2009-10-27 | 2009-10-27 | Current sensor adopting differential coil structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102053193A true CN102053193A (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101933293A Pending CN102053193A (en) | 2009-10-27 | 2009-10-27 | Current sensor adopting differential coil structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749499A (en) * | 2012-07-27 | 2012-10-24 | 成都生辉电子科技有限公司 | Noise reduction structure in alternating-current circuit for current detecting |
| CN103245882A (en) * | 2013-04-27 | 2013-08-14 | 国家电网公司 | Integrated power failure indication and condition monitoring device |
| CN104714070A (en) * | 2013-12-13 | 2015-06-17 | 广东四会互感器厂有限公司 | Current sensor adopting differential coil structure |
| CN107462758A (en) * | 2017-08-31 | 2017-12-12 | 无锡乐尔科技有限公司 | A kind of closed-loop current sensors |
| CN110310808A (en) * | 2019-07-09 | 2019-10-08 | 威胜电气有限公司 | A kind of current transformer and breaker |
| 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 |
| CN113049867A (en) * | 2019-12-26 | 2021-06-29 | 通用电器技术有限公司 | Measuring device for measuring a DC component of a current and associated measuring method |
| CN114242509A (en) * | 2021-12-24 | 2022-03-25 | 杭州玖熠信息科技有限公司 | Breaker on deep fusion column |
-
2009
- 2009-10-27 CN CN2009101933293A patent/CN102053193A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749499A (en) * | 2012-07-27 | 2012-10-24 | 成都生辉电子科技有限公司 | Noise reduction structure in alternating-current circuit for current detecting |
| CN103245882A (en) * | 2013-04-27 | 2013-08-14 | 国家电网公司 | Integrated power failure indication and condition monitoring device |
| CN103245882B (en) * | 2013-04-27 | 2015-11-11 | 国家电网公司 | The power failure instruction of integration and state monitoring apparatus |
| CN104714070A (en) * | 2013-12-13 | 2015-06-17 | 广东四会互感器厂有限公司 | Current sensor adopting differential coil structure |
| CN107462758A (en) * | 2017-08-31 | 2017-12-12 | 无锡乐尔科技有限公司 | A kind of closed-loop current sensors |
| CN107462758B (en) * | 2017-08-31 | 2023-10-20 | 宁波希磁电子科技有限公司 | Closed loop current sensor |
| CN110310808A (en) * | 2019-07-09 | 2019-10-08 | 威胜电气有限公司 | A kind of current transformer and breaker |
| 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 |
| CN113049867A (en) * | 2019-12-26 | 2021-06-29 | 通用电器技术有限公司 | Measuring device for measuring a DC component of a current and associated measuring method |
| CN113049867B (en) * | 2019-12-26 | 2024-05-28 | 通用电器技术有限公司 | Measuring device for measuring DC component of current and associated measuring method |
| CN114242509A (en) * | 2021-12-24 | 2022-03-25 | 杭州玖熠信息科技有限公司 | Breaker on deep fusion column |
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Application publication date: 20110511 |