CN106018912A - High-precision universal alternative and direct current measuring device - Google Patents
High-precision universal alternative and direct current measuring device Download PDFInfo
- Publication number
- CN106018912A CN106018912A CN201610344433.8A CN201610344433A CN106018912A CN 106018912 A CN106018912 A CN 106018912A CN 201610344433 A CN201610344433 A CN 201610344433A CN 106018912 A CN106018912 A CN 106018912A
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- CN
- China
- Prior art keywords
- direct current
- magnetic
- alterating
- measuring apparatus
- current flow
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
-
- 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
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
- G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
Abstract
A high-precision universal alternative and direct current measuring device comprises a casing, magnetic core windings and a circuit board, wherein the magnetic core windings and the circuit board are arranged in the casing. Magnetic cores of the magnetic core windings are made of soft magnetic materials of high magnetic conductivity and low residual magnetism, and two measuring heads of the same performance but different in winding directions are included, closure is complete, and no air gap exists; windings of the magnetic core windings are wound by high voltage resistant enameled wires, each magnetic core comprises the measuring head and a mutual inductive magnetic core, and all the magnetic cores are placed in a radome to play a strict magnetic shielding role; and the radome is of a multilayer structure and has both a magnetic field shielding function and an electric field shielding function, and thus, the current measuring precision can be improved. The measuring device includes a compensation winding which is used compensate a magnetic field generated by measured current at any time, so that only a magnetic field generated by exciting current but not other magnetic fields exists in the measuring heads, namely, a closed-loop magnetic flux gate principle is realized.
Description
Technical field
The present invention relates to a kind of current measuring device, especially a kind of high precision universal alterating and direct current flow measuring apparatus.
Background technology
The method measuring electric current has a variety of, non-contact type is measured to the device of electric current, generally uses magneto sensor to lead to
Cross and measure the magnetic field that electric current produces, and then calculate the size of electric current.Such as measure exchange and generally use transformer, measure direct current
Hall principle is generally used to measure electric current.In numerous current measurement schemes, the method measuring electric current based on fluxgate principle
It is very reliable, the scheme that stability is the highest.Because fluxgate sensitivity is the highest, be the methods such as other such as hall principles without
Method analogy, simultaneously as fluxgate temperature influence is the least, therefore current measuring device based on fluxgate principle has temperature
Characteristic is good, highly sensitive, can measure the feature of electric current in global extent.Fluxgate current measuring device present on market,
Mostly being single and measure head, there is measurement scope little, response time is slow, is generally used for measuring DC current, is difficult to measure exchange
Electric current, especially high-frequency ac current.The simple number of turn improving bucking coil can not with the method obtaining Super-Current Measurement ability
Taking, because measuring an intrinsic frequency of oscillation can be coupled into a large amount of interference component in bucking coil, having a strong impact on measurement apparatus
Output.How to improve the scope measuring electric current, and high-frequency ac and DC current can be measured simultaneously, be that needs solve
Problem.
Summary of the invention
It is an object of the invention to provide a kind of high-precision universal alterating and direct current flow measuring apparatus.
To achieve these goals, the present invention adopts the following technical scheme that a kind of high-precision universal ac and dc current
Measurement apparatus, including shell, magnetic core winding structure, circuit board, described magnetic core winding, circuit board are arranged in the enclosure, described magnetic core
The magnetic core of winding is the soft magnetic materials of the low remanent magnetism of high magnetic conduction and constitutes, and has two performances unanimously around to contrary measurement
Head, of completely closed, there is no air gap, the winding in described magnetic core winding uses high pressure enamel-covered wire coiling, and described magnetic core includes
Measurement head and mutual inductance magnetic core, all magnetic cores are all placed in shielding box, play the function of tight magnetic shield, described shielding box is adopted
With multiple structure, not only having the function of armoured magnetic field but also have the function of shielding electric field, this is for improving current measurement precision pole
It is important.The present invention has a compensative winding, compensates the magnetic field that tested electric current produces at any time, so that in measurement head only
Exist exciting curent produce magnetic field and without other magnetic field, be also closed loop fluxgate principle.
Preferably, the magnetic core of described invention product is closed magnetic core air-gap-free.
Preferably, the shell of described invention product has internal shield layer.
Preferably, the magnetic core of described invention product has 2 measurement heads and 1 mutual inductance magnetic core.
Preferably, 2 measurement head character of described invention product are identical around on the contrary.
Preferably, the shielding box of described invention product uses high magnetic conduction low remanent magnetism material.
Preferably, the shielding box of described invention product uses multiple structure.
Preferably, described invention product has a compensative winding.
Preferably, described invention product have employed closed loop fluxgate principle.
Owing to have employed technique scheme, there is advantages that owing to have employed two attributes identical,
Around to contrary measurement head and a mutual inductor, both greatly reduced the measurement head coupled interference to compensative winding, increased again
Frequency band range to AC measurment.The radome using soft magnetic materials to make measures head to 2 and bucking coil shields
Cover, greatly improve the external interference resistance of product of the present invention, improve the linearity and the precision of current measuring device.With
Time measure electric current owing to present invention employs fluxgate principle, therefore it is high to have measurement current stability, good temp characteristic intrinsic
Feature.
Accompanying drawing explanation
Referring to the drawings and the description below of this preferred implementation, it will be best understood by the present invention and purpose thereof and excellent
Point, wherein:
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 is magnetic core and the shielding box structure of the present invention.
Detailed description of the invention
Referring to the drawings 1 to 2, a kind of high precision universal alterating and direct current flow measuring apparatus.Use principle explanation: magnetic core around
Organizing 1003 Wd and 1004 Wd ' composition double measurement head, square-wave generator 1011 produces square wave, is injected into two winding 1003 Wd
With in 1004 Wd ', two magnetic flux Φ u and Φ u ' can be produced respectively, owing to two measurement heads are material same sizes of the same race, around
To on the contrary, two are measured head is zero to the combined influence that bucking coil 1005 produces.When primary current 1001 Ip is not zero,
The output signal of winding Wd and Wd ' can occur asymmetry, namely can produce even-order harmonic, and wherein second harmonic is even
The main component of harmonic wave, second-harmonic detection circuit 1009 is responsible for detection and is measured the second harmonic signal in head, the reaction of its intensity
The intensity of asymmetrical state, the namely size of primary current Ip.Process signal is sent to 1010 by second-harmonic detection circuit
Process in peak difference demodulator, remove square wave fundamental signal, enter amplifier 1008 together with the signal produced with winding WT and enter
Row processing and amplifying, the existence of mutual inductance winding WT herein is to measure alternating current, increases and measures frequency, improves and measures electric current
Response [H60-L011] speed.Amplifier 1008 comprises driver, will drive bucking coil WC 1,005 1,006 1007, its
Number of ampere turns is equal to Ip, for producing and Ip two magnetic fields in opposite direction equal in magnitude so that the magnetic flux in measurement 1002 removes
Outside Φ u, then there is no other magnetic fluxs.After the present invention finally uses pcb board and magnetic core winding to connect, with the form of overall embedding, fill
In the enclosure, signal and power supply extract envelope with form of terminal.
Magnetic core of the present invention has special construction, is that whole measurement apparatus realizes high-acruracy survey ac and dc current
The critical component of target, the magnetic core measuring head is 2001,2004, use the soft magnetic materials of the low remanent magnetism of high magnetic conduction, material is identical, chi
Very little identical, 2002 and 2005 is two windings measuring head respectively, and the two winding is under square wave excitation, respectively two measurements
Producing, in head magnetic core 2,001 2004, the excitation magnetic flux Φ u and Φ u ' that size equidirectional is contrary, 2007 is mutual inductance magnetic core, has
Winding WT is wrapped on mutual inductance magnetic core 2007.3 magnetic core winding copper foils for shielding materials 2010 with slit are wound around, and are used for
Prevent external electrical field from disturbing.Compensative winding 2011 is also ratio winding, for producing the ampere-turn electric current reverse with IP, the most whole
Magnetic core winding is closed in a magnetic shield box 2012 being made up of internal ring outer shroud and upper and lower covers, is used for intercepting earth magnetism, and
External magnetic field disturbs.
The invention have the advantage that (1) have employed 2 and measures head, there is the coupling effect that disappears, decrease measurement head to bucking coil
Coupled interference, improve the linearity and precision；(2) there is 1 mutual inductance magnetic core and improve the ability measuring high-frequency ac current；
(3) present invention has feedback coil and have employed closed loop fluxgate principle, improves susceptiveness；(4) measure head and transformer is all put
In there is the shielding box that multilayer screen material is made, greatly reduce the interference of outer bound pair magnetic core, improve the steady of device
Qualitative；(5) owing to there is the probability of current overload, this device has display lamp and the terminal output signal of instruction overload.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not right
The restriction of embodiments of the present invention.For those of ordinary skill in the field, the most also may be used
To make change and the variation of other multi-forms, such as core structure, the variation of shielding box structure etc..Here cannot be to all of
Embodiment gives exhaustive.Every belong to obvious change that technical scheme amplified out or variation still in
The row of protection scope of the present invention.
Claims (13)
1. a high precision universal alterating and direct current flow measuring apparatus, it is characterised in that include the measurement being placed in shielding box
Head and mutual inductor, have closed loop system and current overload instruction device that compensative winding is constituted, and PCB uses entirety to fill
The mode of envelope, signal is exported by terminal.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 1, it is characterised in that described survey
Amount head is made up of two closed magnetic core.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 2, it is characterised in that described two
Individual magnetic core performance is consistent, around on the contrary.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 1, it is characterised in that described screen
Cover box and have employed Copper Foil and high magnetic conduction soft magnetic materials.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 1, it is characterised in that described screen
Cover box to be made up of internal ring outer shroud and upper and lower covers and fixed by adhesive tape.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 4, it is characterised in that described copper
Paper tinsel has breach.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 1, it is characterised in that described electricity
Flowing through load instruction device is a display lamp or outputs level signals.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 1, it is characterised in that described mutually
Sense coil uses the magnetic core that high permeability material is constituted.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 1, it is characterised in that described electricity
Road plate is provided with fluxgate second-harmonic detection circuit.
A kind of high precision universal alterating and direct current flow measuring apparatus the most according to claim 1, it is characterised in that described
Circuit board has square-wave generator and peak difference demodulator circuit.
11. a kind of high precision universal alterating and direct current flow measuring apparatus according to claim 1, it is characterised in that described
Circuit board has the current driving circuit of bucking coil.
12. a kind of high precision universal alterating and direct current flow measuring apparatus according to claim 1, it is characterised in that described
Winding all uses the enamel-covered wire coiling of high insulation.
13. a kind of high precision universal alterating and direct current flow measuring apparatus according to claim 1, it is characterised in that described
The mode coiling that compensative winding uses monolayer to unroll forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610344433.8A CN106018912A (en) | 2016-05-23 | 2016-05-23 | High-precision universal alternative and direct current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610344433.8A CN106018912A (en) | 2016-05-23 | 2016-05-23 | High-precision universal alternative and direct current measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106018912A true CN106018912A (en) | 2016-10-12 |
Family
ID=57096990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610344433.8A Pending CN106018912A (en) | 2016-05-23 | 2016-05-23 | High-precision universal alternative and direct current measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106018912A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031666A (en) * | 2019-05-10 | 2019-07-19 | 武汉大学 | A kind of large direct current measuring device and measurement method |
| CN110988430A (en) * | 2019-10-31 | 2020-04-10 | 上海科技大学 | Fluxgate heavy current sensor based on digital second harmonic detection and ripple compensation |
| CN113341201A (en) * | 2021-06-08 | 2021-09-03 | 合肥博微田村电气有限公司 | Fluxgate current sensor and current measuring method |
| CN117214502A (en) * | 2023-09-04 | 2023-12-12 | 希斯灵顿(大连)科技有限公司 | Current sensor, detection device and detection system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052883A (en) * | 2004-11-05 | 2007-10-10 | 旦菲斯克公司 | Detector circuit for measuring current |
| CN101650379A (en) * | 2008-08-15 | 2010-02-17 | 淄博计保互感器研究所 | Combined type sensor |
| CN102496446A (en) * | 2011-11-29 | 2012-06-13 | 中国西电电气股份有限公司 | Zero magnetic flux direct-current current transformer |
| CN105304303A (en) * | 2015-09-30 | 2016-02-03 | 中国计量科学研究院 | Precise AC-DC large current transformer |
-
2016
- 2016-05-23 CN CN201610344433.8A patent/CN106018912A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052883A (en) * | 2004-11-05 | 2007-10-10 | 旦菲斯克公司 | Detector circuit for measuring current |
| CN101650379A (en) * | 2008-08-15 | 2010-02-17 | 淄博计保互感器研究所 | Combined type sensor |
| CN102496446A (en) * | 2011-11-29 | 2012-06-13 | 中国西电电气股份有限公司 | Zero magnetic flux direct-current current transformer |
| CN105304303A (en) * | 2015-09-30 | 2016-02-03 | 中国计量科学研究院 | Precise AC-DC large current transformer |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031666A (en) * | 2019-05-10 | 2019-07-19 | 武汉大学 | A kind of large direct current measuring device and measurement method |
| CN110031666B (en) * | 2019-05-10 | 2021-04-16 | 武汉大学 | Direct current heavy current measuring device and measuring method |
| CN110988430A (en) * | 2019-10-31 | 2020-04-10 | 上海科技大学 | Fluxgate heavy current sensor based on digital second harmonic detection and ripple compensation |
| CN110988430B (en) * | 2019-10-31 | 2022-08-02 | 上海科技大学 | Fluxgate heavy current sensor based on digital second harmonic detection and ripple compensation |
| CN113341201A (en) * | 2021-06-08 | 2021-09-03 | 合肥博微田村电气有限公司 | Fluxgate current sensor and current measuring method |
| CN113341201B (en) * | 2021-06-08 | 2022-08-09 | 合肥博微田村电气有限公司 | Fluxgate current sensor and current measuring method |
| CN117214502A (en) * | 2023-09-04 | 2023-12-12 | 希斯灵顿(大连)科技有限公司 | Current sensor, detection device and detection system |
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