CN107918049A - A kind of current detecting system - Google Patents
A kind of current detecting system Download PDFInfo
- Publication number
- CN107918049A CN107918049A CN201711339976.1A CN201711339976A CN107918049A CN 107918049 A CN107918049 A CN 107918049A CN 201711339976 A CN201711339976 A CN 201711339976A CN 107918049 A CN107918049 A CN 107918049A
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- magnetized film
- current
- detecting system
- computer
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
-
- 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
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/241—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention relates to a kind of current detecting system, comprising：Optical current sensor, photoelectric converter and computer；Optical current sensor includes light-emitting component, collimation lens, the first convex lens, electromagnetic generator, the magnetized film in magnetic field, the second convex lens and the coupled lens for connecting external current source；The light that light-emitting component produces after collimation lens and the first convex lens via being irradiated on magnetized film, and via entering photoelectric converter after the second convex lens and coupled lens, the optical signal of reception is changed into electric signal and output is to computer；Allocation of computer has the mathematical model of the deflection value triadic relation of the current value of external current source, magnetic induction intensity value and magnetized film central point, computer can calculate the deflection value of magnetized film central point according to electric signal, and computer can calculate the size of current of external current source according to the deflection value of magnetized film central point.The current detecting system of the present invention can more more precisely detect the numerical value of external current source.
Description
Technical field
The present invention relates to current detection technology, and in particular, to a kind of current detecting system.
Background technology
With the development of electric system, power system capacity is increasing, and the requirement to safety and stability is also higher and higher.After
The effect of electric protection system is increasingly prominent, and current measurement is electrical energy measurement in electric system, relay protection, network analysis, is
The key of system monitoring, plays very important effect, its measurement accuracy and reliability are straight in system maintenance, fault diagnosis etc.
Connect safe and reliable, the economical operation for being related to electric system.The insulation system of traditional electromagnetic current transducer is complicated, whole
Body size and weight are big so that financial cost greatly increases, iron core easily produces magnetic saturation, transient response scope is small, electric current is mutual
The error increase of sensor.Although continuing to optimize, these can not be inherently solved the problems, such as.In view of this, it is special to propose this
Application.
The content of the invention
The technical problems to be solved by the invention are how to more precisely detect the electric current of electric device.
In order to solve the above technical problems, the present invention provides a kind of current detecting system, comprising：Optical current sensor, light
Electric transducer and computer；The optical current sensor include light-emitting component, collimation lens, the first convex lens, to even
External current source is connect to produce the electromagnetic generator in magnetic field, positioned at the magnetized film caused by magnetic field generator in magnetic field, second
Convex lens and coupled lens；The light that the light-emitting component produces after collimation lens and the first convex lens successively via irradiating
In on magnetized film, the light after being acted on via the magnetized film is laggard via second convex lens and the coupled lens successively
Enter the photoelectric converter；The optical signal of reception can be changed into electric signal and be delivered to the calculating by the photoelectric converter
Machine；The allocation of computer has the current value of the external current source, the magnetization magnetic induction intensity value of film location and described
The mathematical model of the deflection value triadic relation of magnetized film central point, the electricity that the computer can be exported according to the photoelectric converter
Signal calculates the deflection value of the magnetized film central point, and the computer can be calculated according to the deflection value of the magnetized film central point
The size of current of the external current source.
It is preferred that the electromagnetic generator includes the conduct piece to connect external current source and is sheathed on the conduct piece
On ring-type iron core, the ring-type iron core has to configure the magnetic gap of the magnetized film, and the conduct piece connects foreign current
Electromagnetic field can be produced during source in the magnetic gap of the ring-type iron core.
It is preferred that the conduct piece is copper bar.
It is preferred that the height of the magnetic gap of the ring-type iron core is between 3.8mm to 4.1mm.
It is preferred that the ring-type iron core uses silicon steel material
It is preferred that the magnetized film is PET magnetized films.
It is preferred that the deflection value of the magnetized film central point and the relation of the magnetic induction intensity value meet the following formula：
Wherein, y0 is the deflection value of magnetized film central point, and R is magnetized film
Effective radius, B is magnetic induction intensity value, μ0It is magnetization film thickness for elasticity modulus that space permeability, E are magnetized film, h.
It is preferred that the deflection value of the magnetized film central point and the size of current of the external current source are linear relationship.
It is preferred that the photoelectricity development of evil in febrile disease device is ccd sensor.
By using above-mentioned technical proposal, the present invention can obtain following technique effect：
1st, technical scheme is by deflection value of the optical current sensor coupled computer to magnetized film, external current source
Current value and the mathematical modulo mould established of magnetic induction intensity value, can more more precisely detect the numerical value of external current source；
2nd, ring-type iron core uses silicon steel material, is conducive to poly- magnetic so that magnetized film can more it is easy under the influence of a magnetic field
Produce deformation.
Brief description of the drawings
Fig. 1 depicts the logic relation picture of each component of current detecting system of the present invention；
Fig. 2 depicts the deflection value of the central point of magnetized film and the graph of a relation of the size of external current source.
Embodiment
To make the purpose, technical scheme and advantage of embodiment of the present invention clearer, implement below in conjunction with the present invention
Attached drawing in mode, is clearly and completely described the technical solution in embodiment of the present invention, it is clear that described reality
The mode of applying is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained without creative efforts, belongs to the present invention
The scope of protection.Therefore, below the detailed description of the embodiments of the present invention to providing in the accompanying drawings be not intended to limit will
The scope of the present invention of protection is sought, but is merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained without creative efforts, belongs to this
Invent the scope of protection.
With reference to Fig. 1, current detecting system of the invention, comprising：Optical current sensor, photoelectric converter and calculating
Machine；Optical current sensor include light-emitting component 1, collimation lens 2, the first convex lens 3, connecting external current source to produce
The electromagnetic generator 4 in magnetic field, positioned at the magnetized film 7 caused by magnetic field generator 4 in magnetic field, the second convex lens 8 and coupling
Lens 9；The light that light-emitting component 1 produces successively via being irradiated in after 2 and first convex lens 3 of collimation lens on magnetized film 7, via
Magnetized film 7 act on after light successively via entering photoelectric converter after the second convex lens 8 and coupled lens 9；Photoelectric converter
The optical signal of reception can be changed into electric signal and be delivered to the computer；Allocation of computer has the electric current of external current source
It is worth, the mathematical model of the deflection value triadic relation of 7 central point of the magnetic induction intensity value of 7 position of magnetized film and magnetized film, computer
The electric signal that can be exported according to photoelectric converter calculates the deflection value of 7 central point of magnetized film, and computer can be according to 7 center of magnetized film
The deflection value of point calculates the size of current of external current source.
The light that light-emitting component 1 is sent injects magnetization via can be changed to directional light after 2 and first convex lens 3 of collimation lens
Light can be transferred to collimation lens 2 by film, light-emitting component 1 by optical fiber.After light is via the second convex lens 8 and coupled lens 9
Can be into line convergence with into photoelectric converter.
In the present embodiment, electromagnetic generator 4 includes the conduct piece 5 to connect external current source and is sheathed on conduct piece
Ring-type iron core 4 on 5, ring-type iron core 4 have to configure the magnetic gap of magnetized film 7, can be when conduct piece 5 connects external current source
Electromagnetic field is produced in the magnetic gap of ring-type iron core 4.Conduct piece 5 can be copper bar, or the preferable conduct piece of other electric conductivity.Ring-type iron core
The height of 4 magnetic gap can be between 3.8mm to 4.1mm, such as 4.0mm.Ring-type iron core 4 can use silicon steel material, with preferably
Poly- magnetic.Magnetized film can be PET magnetized films.Photoelectricity development of evil in febrile disease device can be ccd sensor.
Computer can configure Ansoft softwares, with to the current value of external current source, magnetic induction intensity value and magnetized film 7
The relation founding mathematical models of deflection value three, the theoretical foundation of the mathematical model include herein below：
(1) deflection value of magnetized film central point and the relation of magnetic induction intensity meet the following formula：
Wherein, it is the deflection value of magnetized film, R is the effective radius of magnetized film,
B is magnetic induction intensity value, be space permeability, E is the elasticity modulus of magnetized film, h is magnetization film thickness.
The relation of the deflection value of magnetized film and the magnetic induction intensity value is established as follows：Magnetized film is circular sheet material, its
The foundation of the stress balance equation of the foundation of stress balance equation and thin plate has certain similitude in magnetic field.Because magnetized film is very
It is thin, resistance to bending very little, and it is flexible, can bend deformation under the action of the magnetostatic power in magnetic field.Magnetized film is very light, its own weight
Amount is negligible, the thickness very little of magnetized film, and material is very soft, and bending stiffness D can not have to consider.As bending stiffness D=0
When, the radial displacement of magnetized film is axisymmetric, i.e., planar without torsional deformation, all the time in tensioning state, there is no ring
To displacement.
Magnetized film in magnetic field after by pre-tensioning, in film the displacement at any point can be divided into two components：Radial direction position
Move the p and amount of deflection y vertical with membrane plane.The elastic equation established for magnetized film and the strain stress relation of displacement expression are respectively：
Wherein Nr be the radial load of unit length, the circumferential direction of Nt unit lengths make a concerted effort, the pretension of N0 unit lengths, P radial displacements,
Y amounts of deflection, ε r radial strains component, ε t hoop strains component, r magnetized films radius, h magnetization film thickness, v Poisson's ratios.By calculating,
The deflection value y0 satisfactions that magnetized film central point can be obtained are following：
Wherein, q uniform loads, R are the effective radius of magnetized film, E is the elasticity modulus of magnetized film, h is magnetization film thickness.
When magnetized film is in uniform magnetic field, it can be acted on be subject to uniform magnetic field power, the size of power can be expressed as：
Due to uniform loadAbove formula is substituted into, obtains the deflection value y of magnetized film central point0For：
Wherein, μ0=4 π × 10-7N/A2, i.e. space permeability；B, magnetic field
Make the magnetic induction intensity of use with magnetized film；S, magnetic field and the area of magnetized film acting surface.
(2) size of current of the deflection value of magnetized film central point and external current source is linear relationship, that is, meets the following formula：
y0=kx, wherein being the deflection value of magnetized film, k depends on optical current sensor configured in one piece, and x is external current source
Current value, when being subject to identical magnetic induction intensity, the diameter of magnetized film is bigger, and amount of deflection deformation is bigger, optical current sensing
The sensitivity increase of device.Obtained by emulation experiment, be put into the average magnetic induction intensity phase that various sizes of magnetized film in magnetic gap is subject to
It is poor little, but for the magnetized film of different-diameter and thickness, it is subject to the uniformity coefficient difference of magnetic induction intensity very big.Ensureing
The magnetized film being relatively large in diameter is selected in the case of magnetic induction intensity is uniform as far as possible.
The concrete principle for the deflection value that the electric signal that computer is exported according to photoelectric converter calculates magnetized film is as follows：Light
Via magnetization film location magnetic fields after, its polarization situation changes, by detection light polarization variations situation, can between
Connect the deflection value for detecting magnetized film.Amount of deflection change using photoelectric converter detection magnetized film is the known technology of industry, therefore
Repeat no more.
In one embodiment, the length of ring-type iron core is 200mm, width 144mm, sectional area 50mm*50mm, copper bar
Width be 40mm, thickness 4mm.The height of the magnetic gap of ring-type iron core 4 is 4.0mm.Magnetized film is PET magnetized films, and PET magnetizes
The elastic modulus E of film is 2.17Gpa, effective radius R is 50um, thickness h 20um.With reference to Fig. 2, Fig. 2 is depicted corresponding to outer
The graph of a relation of the size of current of portion's current source and the deflection value of magnetized film, the situation of above-mentioned configuration is used in optical current sensor
Under, k values substantially 0.27.
Technical scheme is by deflection value of the optical current sensor coupled computer to magnetized film, foreign current
The mathematical model that the current value and magnetic induction intensity value in source are established, can more more precisely detect the electric current of external current source
Value.The foregoing is merely the preferred embodiment of the present invention, is not intended to limit the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of current detecting system, it is characterised in that include：Optical current sensor, photoelectric converter and computer；
The optical current sensor include light-emitting component (1), collimation lens (2), the first convex lens (3), connecting outside
Current source to produce the electromagnetic generator in magnetic field (4), positioned at the magnetized film (7) caused by magnetic field generator (4) in magnetic field,
Two convex lenses (8) and coupled lens (9)；The light that the light-emitting component (1) produces is successively via collimation lens (2 and first
It is irradiated in after convex lens (3) on magnetized film (7), the light after being acted on via the magnetized film (7) is convex via described second successively
Lens (8) and the coupled lens (9) enter the photoelectric converter afterwards；
The optical signal of reception can be changed into electric signal and exported to the computer by the photoelectric converter；
The allocation of computer have the current value of the external current source, the magnetized film (7) position magnetic induction intensity value and
The mathematical model of the deflection value triadic relation of magnetized film (7) central point, the computer can be according to the photoelectric converter
The electric signal of output calculates the deflection value of magnetized film (7) central point, and the computer can be according to the magnetized film (7) center
The deflection value of point calculates the size of current of the external current source.
2. current detecting system according to claim 1, it is characterised in that the electromagnetic generator (4) is included to even
The ring-type iron core (4) for connecing the conduct piece (5) of external current source and being sheathed on the conduct piece (5), ring-type iron core (4) tool
There is a magnetic gap for configuring the magnetized film (7), when conduct piece (5) the connection external current source can be in the ring-type iron core
(4) electromagnetic field is produced in magnetic gap.
3. current detecting system according to claim 2, it is characterised in that the conduct piece (5) is copper bar.
4. current detecting system according to claim 2, it is characterised in that the height of the magnetic gap of the ring-type iron core (4)
For between 3.8mm to 4.1mm.
5. current detecting system according to claim 2, it is characterised in that the ring-type iron core (4) uses silicon steel sheet material
Material.
6. according to the current detecting system, it is characterised in that the magnetized film is PET magnetized films.
7. current detecting system according to claim 1, it is characterised in that the deflection value of the magnetized film central point and institute
The relation for stating magnetic induction intensity value meets the following formula:
Wherein, y0 is the deflection value of magnetized film central point, and R is effective for magnetized film
Radius, B is magnetic induction intensity value, μ0It is magnetization film thickness for elasticity modulus that space permeability, E are magnetized film, h.
8. current detecting system according to claim 1, it is characterised in that the deflection value of the magnetized film central point and institute
The size of current for stating external current source is linear relationship.
9. current detecting system according to claim 1, it is characterised in that the photoelectricity development of evil in febrile disease device is ccd sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711339976.1A CN107918049A (en) | 2017-12-14 | 2017-12-14 | A kind of current detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711339976.1A CN107918049A (en) | 2017-12-14 | 2017-12-14 | A kind of current detecting system |
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| CN107918049A true CN107918049A (en) | 2018-04-17 |
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| CN201711339976.1A Pending CN107918049A (en) | 2017-12-14 | 2017-12-14 | A kind of current detecting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337733A (en) * | 2019-05-14 | 2020-06-26 | 重庆大学 | TMR-based busbar current and magnetic field intensity measuring device |
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| WO2015149473A1 (en) * | 2014-04-03 | 2015-10-08 | 易能乾元（北京）电力科技有限公司 | Optical current sensor |
| CN106771496A (en) * | 2017-01-10 | 2017-05-31 | 上海理工大学 | A kind of optical current sensor |
| CN107250814A (en) * | 2015-01-16 | 2017-10-13 | 西门子公司 | The method of photoelectric measuring device and measurement electric current |
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2017
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Patent Citations (4)
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|---|---|---|---|---|
| CN103443639A (en) * | 2012-08-29 | 2013-12-11 | 北京恒信创光电技术有限公司 | Current measurement system, optical current transformer and fixing device thereof, light signal sampler and method thereof |
| WO2015149473A1 (en) * | 2014-04-03 | 2015-10-08 | 易能乾元（北京）电力科技有限公司 | Optical current sensor |
| CN107250814A (en) * | 2015-01-16 | 2017-10-13 | 西门子公司 | The method of photoelectric measuring device and measurement electric current |
| CN106771496A (en) * | 2017-01-10 | 2017-05-31 | 上海理工大学 | A kind of optical current sensor |
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| 方幼丽 等: "基于静电场原理的光学电压传感器研究", 《福建农机》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337733A (en) * | 2019-05-14 | 2020-06-26 | 重庆大学 | TMR-based busbar current and magnetic field intensity measuring device |
| CN111337733B (en) * | 2019-05-14 | 2022-01-28 | 重庆大学 | TMR-based busbar current and magnetic field intensity measuring device |
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Application publication date: 20180417 |