CN108802470A - A kind of optical current measuring device - Google Patents
A kind of optical current measuring device Download PDFInfo
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- CN108802470A CN108802470A CN201810655148.7A CN201810655148A CN108802470A CN 108802470 A CN108802470 A CN 108802470A CN 201810655148 A CN201810655148 A CN 201810655148A CN 108802470 A CN108802470 A CN 108802470A
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- Prior art keywords
- optical
- magnetic field
- solenoid
- optical fiber
- current
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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
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a kind of optical current measuring devices, including sense head system, dynamic correcting system, photoelectricity demodulating system and optical fiber branch device；Sense head system includes one or more crystal light valve magnetic field sensors, one or more solenoids, P1 current terminals and P2 current terminals, the both ends of crystal light valve magnetic field sensor are connect by optical fiber with optical fiber branch device, dynamic correcting system is connected by the downlink optical interface of optical fiber and optical fiber branch device, photoelectricity demodulating system includes light source, photoelectricity demodulating unit and optical cable, and photoelectricity demodulating system is connect by optical cable with optical fiber branch device.Apparatus of the present invention eliminate the influence of the factors such as temperature, magnetic field, amplify primary current signal by solenoid, while passing through difference double photo paths, eliminate external magnetic field interference, the measurement accuracy of optical transformer is substantially increased, it is 0.5A that can measure minimum rated current, and class of accuracy is 0.2S grades.
Description
Technical field
The present invention relates to electrical equipment technical field more particularly to a kind of optical current measuring devices.
Background technology
Currently, under high pressure and ultra-high pressure condition, widely used oil-filled induction Current Mutual Inductance in electric system
Device is limited to realizing the measurement of electric current by its measuring principle, and there is under insulation difficulty, fault current for this kind of current transformer
The shortcomings such as magnetic saturation.Therefore, people strive to find always a kind of novel current transformer, are based on Faraday magnetooptical effect
The optical current mutual inductor of principle is considered as a kind of New type of current measuring apparatus with wide application prospect, it has insulation
It is simple and reliable, without magnetic saturation, without second open circuit is dangerous, anti-electromagnetic interference capability is strong, small, light-weight, installation and transportation are convenient
The advantages that, compared with traditional CT, there is considerable cost performance.Therefore, this field has become what the world was competitively studied at present
Hot spot, nearly ten years, have some experimental prototype hanging net operations, achieve preferable effect, but also expose temperature stability,
Some problems such as long-term running stability.Therefore, optical current mutual inductor system, each portion of careful selection are rationally designed
Part is particularly important to improving its performance.
Invention content
In order to overcome the deficiencies of the prior art, the present invention is to provide a kind of, and the optics based on crystal light valve magnetic field sensor is electric
Flow measuring apparatus generates magnetic field by analyzing magnetic field using the method induced field of Faraday magnetooptical effect to calculate to measure
Electric current amplifies primary current signal by solenoid, while by difference double photo paths, eliminating external magnetic field interference, significantly
Improve the measurement accuracy of optical transformer.
In order to solve the technical problem in background technology, the present invention provides a kind of optical current measuring devices, including pass
Feel head system, dynamic correcting system, photoelectricity demodulating system and optical fiber branch device；
The sense head system includes one or more crystal light valve magnetic field sensors, one or more solenoids, P1 electricity
Stream terminal and P2 current terminals, the crystal light valve magnetic field sensor are fixed in the solenoid, and same with the solenoid
Axis is arranged, and the length of the crystal light valve magnetic field sensor is less than the solenoidal length, the solenoid for one when institute
It states P1 current terminals and P2 current terminals is drawn by solenoid both ends or when the solenoid is multiple, between the solenoid
It is linked in sequence by plain conductor, first to be linked in sequence solenoid draws P1 current terminals, the last one being linked in sequence
Solenoid draws P2 current terminals, and the both ends of the crystal light valve magnetic field sensor pass through optical fiber and the optical fiber branch device downlink
Optical interface connects, and the crystal light valve magnetic field sensor is identical as the solenoidal quantity and corresponds；
The dynamic correcting system is connect by optical fiber with the downlink optical interface of the optical fiber branch device, the dynamic calibration
System forms on the outside of crystal light valve magnetic field sensor for converting optical signal into electric current and refers to magnetic field, the crystal
Light valve magnetic field sensor is detected simultaneously by the tested magnetic field with reference to magnetic field and solenoid generation；
The photoelectricity demodulating system includes light source and photoelectricity demodulating unit, the photoelectricity demodulating system by optical cable with it is described
Optical fiber branch device uplink optical interface connects, and the light source sends out the first constant optical signal, the second optical signal and third optical signal,
First optical signal and the second optical signal are transferred to the crystal light valve magnetic field sensor by the optical fiber branch device, described
Third optical signal is transferred to the dynamic correcting system by the optical fiber branch device, and the crystal light valve magnetic field sensor is felt
The magnetic field signal for the tested electric current answered passes the photoelectricity demodulating system back by optical fiber branch device, and the photoelectricity demodulating system will be anti-
The optical signal being fed back to is converted into electric signal, and is demodulated, and tested electric current is calculated.
Further, the multiple solenoid is parallel pours integrally.
Further, the dynamic correcting system includes photoelectric calibration device and reference coil, the photoelectric calibration device and institute
The downlink optical interface connection of optical fiber branch device is stated, the reference coil is placed in the solenoid.
Further, the reference coil is identical as the quantity of crystal light valve magnetic field sensor and corresponds, institute
It states and is linked in sequence by plain conductor between reference coil.
Further, the wavelength of first optical signal is 1400-1600nm；The wavelength of second optical signal is
1350-1550nm；The wavelength of the third optical signal is 850-1050nm.
Specifically, first optical signal and the second optical signal set are at difference double light path.
Specifically, the light source is laser.
Further, the current data that the photoelectricity demodulating system is measured is packaged with IEC61850 standard agreement formats, hair
It send to subordinate's combining unit.
A kind of optical current measuring device of the present invention, eliminates the influence of the factors such as temperature, magnetic field, is put by solenoid
Big primary current signal, while by difference double photo paths, eliminating external magnetic field interference, substantially increasing optical transformer
Measurement accuracy, it is 0.5A that can measure minimum rated current, and class of accuracy is 0.2S grades, reaches international most advanced level.
Description of the drawings
It, below will be to required in embodiment or description of the prior art in order to illustrate more clearly of technical scheme of the present invention
The attached drawing used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, right
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Its attached drawing.
Fig. 1 is a kind of structural schematic diagram of optical current measuring device of the present invention.
Wherein, reference numeral corresponds in figure：1- crystal light valve magnetic field sensors, 2- solenoids, 3-P1 current terminals, 4-
P2 current terminals, 5- photoelectric calibration devices, 6- reference coils, 7- optical fiber branch devices, 8- light sources, 9- photoelectricity demodulating units, 10- light
Cable.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of not making creative work it is all its
His embodiment, shall fall within the protection scope of the present invention.
Embodiment 1：
The invention discloses a kind of optical current measuring devices, including sense head system, dynamic correcting system, photoelectricity to demodulate
System and optical fiber branch device 7；
The sense head system includes 1, solenoid 2 of a crystal light valve magnetic field sensor, P1 current terminals 3 and P2
Current terminal 4, the crystal light valve magnetic field sensor 1 are fixed in the solenoid 2, and are coaxially disposed with the solenoid 2,
The length of the crystal light valve magnetic field sensor 1 is less than the length of the solenoid 2, P1 when being one of the solenoid 2
Current terminal 3, P2 current terminals 4 are drawn by 2 both ends of solenoid, P1 current terminals 3 and the access of P2 current terminals 4 are tested electric current,
The both ends of the crystal light valve magnetic field sensor 1 are connect by optical fiber with 7 downlink optical interface of the optical fiber branch device, the crystal
Light valve magnetic field sensor 1 is identical as the quantity of the solenoid 2 and corresponds；
The dynamic correcting system is connect by optical fiber with the downlink optical interface of the optical fiber branch device 7, the dynamic school
Positive system forms in 1 outside of crystal light valve magnetic field sensor for converting optical signal into electric current and refers to magnetic field, the crystalline substance
Body light valve magnetic field sensor 1 is detected simultaneously by the tested magnetic field with reference to magnetic field and the generation of the solenoid 2；
The photoelectricity demodulating system includes light source 8 and photoelectricity demodulating unit 9, the photoelectricity demodulating system by optical cable 10 with
7 uplink optical interface of the optical fiber branch device connects, and the light source 8 sends out the first constant optical signal, the second optical signal and third
Optical signal, first optical signal and the second optical signal are transferred to the crystal light valve magnetic field by the optical fiber branch device 7 and pass
Sensor 1, the third optical signal are transferred to the dynamic correcting system, the crystal light valve magnetic by the optical fiber branch device 7
The magnetic field signal for the tested electric current that field sensor 1 is incuded passes the photoelectricity demodulating system, the light back by optical fiber branch device 7
The optical signal fed back to is converted into electric signal by electrolysis adjusting system, and is demodulated, and tested electric current is calculated.
Further, the multiple solenoid 2 is parallel pours integrally.
Further, the dynamic correcting system includes photoelectric calibration device 5 and reference coil 6, the photoelectric calibration device 6 with
The downlink optical interface of the optical fiber branch device 7 connects, and the reference coil 6 is placed in the solenoid 2.
Further, the reference coil 6 is identical as the quantity of the crystal light valve magnetic field sensor 1 and corresponds,
It is linked in sequence by plain conductor between the reference coil 6.
Further, the wavelength of first optical signal is 1550nm, power is 450 μ W；The wave of second optical signal
A length of 1490nm, power are 450 μ W；The wavelength of the third optical signal is 980nm, power is 120 μ W.
Specifically, first optical signal and the second optical signal set are at difference double light path.
Specifically, the light source is laser.
Further, the current data that the photoelectricity demodulating system is measured is packaged with IEC61850 standard agreement formats, hair
It send to subordinate's combining unit.
Embodiment 2：
Referring to Fig. 1, the invention discloses a kind of optical current measuring device, including sense head system, dynamic calibration system
System, photoelectricity demodulating system and optical fiber branch device 7；
The sense head system includes two crystal light valve magnetic field sensors, 1, two solenoid 2, P1 current terminals 3 and P2
Current terminal 4, the crystal light valve magnetic field sensor 1 are fixed in the solenoid 2, and are coaxially disposed with the solenoid 2,
The length of the crystal light valve magnetic field sensor 1 is less than the length of the solenoid 2, spiral shell when being two of the solenoid 2
It is linked in sequence by plain conductor between spool 2, first to be linked in sequence solenoid draws P1 current terminals 3, is linked in sequence
The last one solenoid draw P2 current terminals 4, P1 current terminals 3 and the access of P2 current terminals 4 are tested electric current, the crystal
The both ends of light valve magnetic field sensor 1 are connect by optical fiber with 7 downlink optical interface of the optical fiber branch device, the crystal light valve magnetic field
Sensor 1 is identical as the quantity of the solenoid 2 and corresponds；
The dynamic correcting system is connect by optical fiber with the downlink optical interface of the optical fiber branch device 7, the dynamic school
Positive system forms in 1 outside of crystal light valve magnetic field sensor for converting optical signal into electric current and refers to magnetic field, the crystalline substance
Body light valve magnetic field sensor 1 is detected simultaneously by the tested magnetic field with reference to magnetic field and the generation of the solenoid 2；
The photoelectricity demodulating system includes light source 8 and photoelectricity demodulating unit 9, the photoelectricity demodulating system by optical cable 10 with
7 uplink optical interface of the optical fiber branch device connects, and the light source 8 sends out the first constant optical signal, the second optical signal and third
Optical signal, first optical signal and the second optical signal are transferred to the crystal light valve magnetic field by the optical fiber branch device 7 and pass
Sensor 1, the third optical signal are transferred to the dynamic correcting system, the crystal light valve magnetic by the optical fiber branch device 7
The magnetic field signal for the tested electric current that field sensor 1 is incuded passes the photoelectricity demodulating system, the light back by optical fiber branch device 7
The optical signal fed back to is converted into electric signal by electrolysis adjusting system, and is demodulated, and tested electric current is calculated.
Further, the multiple solenoid 2 is parallel pours integrally.
Further, the dynamic correcting system includes photoelectric calibration device 5 and reference coil 6, the photoelectric calibration device 6 with
The downlink optical interface of the optical fiber branch device 7 connects, and the reference coil 6 is placed in the solenoid 2.
Further, the reference coil 6 is identical as the quantity of the crystal light valve magnetic field sensor 1 and corresponds,
It is linked in sequence by plain conductor between the reference coil 6.
Further, the wavelength of first optical signal is 1550nm, power is 450 μ W；The wave of second optical signal
A length of 1490nm, power are 450 μ W；The wavelength of the third optical signal is 980nm, power is 120 μ W.
Specifically, first optical signal and the second optical signal set are at difference double light path.
Specifically, the light source is laser.
Further, the current data that the photoelectricity demodulating system is measured is packaged with IEC61850 standard agreement formats, hair
It send to subordinate's combining unit.
A kind of optical current measuring device of the present invention, eliminates the influence of the factors such as temperature, magnetic field, is put by solenoid
Big primary current signal, while by difference double photo paths, eliminating external magnetic field interference, substantially increasing optical transformer
Measurement accuracy, it is 0.5A that can measure minimum rated current, and class of accuracy is 0.2S grades, reaches international most advanced level.
The optical current measuring device course of work of the embodiment of the present invention is as follows：Constant first is sent out by light source laser
Optical signal and the second optical signal pass sequentially through optical cable, optical fiber branch device and optical fiber and are transferred to crystal light valve magnetic field sensor, crystal
The magnetic field signal for the tested electric current that light valve magnetic field sensor is incuded passes photoelectricity demodulating system back by optical fiber, by light source laser
It sends out constant third optical signal and passes sequentially through optical cable, optical fiber branch device and optical fiber and be transferred to dynamic correcting system, dynamic calibration
System converts optical signal into electric current, and then is formed on the outside of crystal light valve magnetic field sensor and refer to magnetic field, crystal light valve magnetic field
Sensor is detected simultaneously by the tested magnetic field with reference to magnetic field and solenoid generation；Crystal light valve magnetic field sensor is incuded tested
The magnetic field signal of electric current passes the photoelectricity demodulating system back by optical fiber, and the photoelectricity demodulating system turns the optical signal fed back to
It changes electric signal into, and is demodulated, calculate tested electric current, and be packaged with IEC61850 standard agreement formats, be sent to subordinate
Combining unit.
Solenoid quantity is not necessarily two in the specific embodiment of the invention 2, can be three, four or more.
The above is the preferred embodiment of the present invention, it should be noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of optical current measuring device, which is characterized in that including sense head system, dynamic correcting system, photoelectricity demodulation system
System and optical fiber branch device (7)；
The sense head system includes one or more crystal light valve magnetic field sensors (1), one or more solenoids (2), P1
Current terminal (3) and P2 current terminals (4), the crystal light valve magnetic field sensor (1) are fixed in the solenoid (2), and
It is coaxially disposed with the solenoid (2), the length of the crystal light valve magnetic field sensor (1) is less than the length of the solenoid (2)
Degree, when the solenoid (2) is one, the P1 current terminals (3) and P2 current terminals (4) are drawn by solenoid (2) both ends,
Or the solenoid (2) is linked in sequence between the solenoid (2) by plain conductor when being multiple, first to be linked in sequence
A solenoid draws P1 current terminals (3), the last one solenoid being linked in sequence draws P2 current terminals (4), the crystal
The both ends of light valve magnetic field sensor (1) are connect by optical fiber with the optical fiber branch device (7) downlink optical interface, the crystal light valve
Magnetic field sensor (1) is identical as the quantity of the solenoid (2) and corresponds；
The dynamic correcting system is connect by optical fiber with the downlink optical interface of the optical fiber branch device (7), the dynamic calibration
System forms on the outside of crystal light valve magnetic field sensor (1) for converting optical signal into electric current and refers to magnetic field, the crystalline substance
Body light valve magnetic field sensor (1) is detected simultaneously by the tested magnetic field with reference to magnetic field and the solenoid (2) generation；
The photoelectricity demodulating system includes light source (8) and photoelectricity demodulating unit (9), and the photoelectricity demodulating system passes through optical cable (10)
It is connect with the optical fiber branch device (7) uplink optical interface, the light source (8) sends out the first constant optical signal, the second optical signal
With third optical signal, first optical signal and the second optical signal are transferred to the crystal light by the optical fiber branch device (7)
Valve magnetic field sensor (1), the third optical signal are transferred to the dynamic correcting system, institute by the optical fiber branch device (7)
The magnetic field signal for stating the tested electric current that crystal light valve magnetic field sensor (1) is incuded passes the light back by optical fiber branch device (7)
It is electrolysed adjusting system, the optical signal fed back to is converted into electric signal by the photoelectricity demodulating system, and is demodulated, and is calculated tested
Electric current.
2. a kind of optical current measuring device according to claim 1, which is characterized in that the multiple solenoid (2) is flat
Row pours integral.
3. a kind of optical current measuring device according to claim 1, which is characterized in that the dynamic correcting system includes
Photoelectric calibration device (5) and reference coil (6), the photoelectric calibration device (6) and the downlink optical interface of the optical fiber branch device (7) connect
It connects, the reference coil (6) is placed in the solenoid (2).
4. a kind of optical current measuring device according to claim 3, which is characterized in that the reference coil (6) and institute
The quantity for stating crystal light valve magnetic field sensor (1) is identical and correspond, suitable by plain conductor between the reference coil (6)
Sequence connects.
5. a kind of optical current measuring device according to claim 1, which is characterized in that the wavelength of first optical signal
For 1400-1600nm；The wavelength of second optical signal is 1350-1550nm；The wavelength of the third optical signal is 850-
1050nm。
6. a kind of optical current measuring device according to claim 1 or 5, which is characterized in that first optical signal and
Second optical signal set is at difference double light path.
7. a kind of optical current measuring device according to claim 1 or 5, which is characterized in that the light source is laser.
8. a kind of optical current measuring device according to claim 1, which is characterized in that the photoelectricity demodulating system is measured
Current data with IEC61850 standard agreement formats be packaged, be sent to subordinate's combining unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810655148.7A CN108802470A (en) | 2018-06-23 | 2018-06-23 | A kind of optical current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810655148.7A CN108802470A (en) | 2018-06-23 | 2018-06-23 | A kind of optical current measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108802470A true CN108802470A (en) | 2018-11-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810655148.7A Withdrawn CN108802470A (en) | 2018-06-23 | 2018-06-23 | A kind of optical current measuring device |
Country Status (1)
| Country | Link |
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| CN (1) | CN108802470A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362945A (en) * | 2020-11-26 | 2021-02-12 | 湖南新海讯光电有限公司 | Optical current measuring device |
-
2018
- 2018-06-23 CN CN201810655148.7A patent/CN108802470A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362945A (en) * | 2020-11-26 | 2021-02-12 | 湖南新海讯光电有限公司 | Optical current measuring device |
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Application publication date: 20181113 |