CN202305631U - Optical-fiber-type current transformer - Google Patents
Optical-fiber-type current transformer Download PDFInfo
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- CN202305631U CN202305631U CN2011204328661U CN201120432866U CN202305631U CN 202305631 U CN202305631 U CN 202305631U CN 2011204328661 U CN2011204328661 U CN 2011204328661U CN 201120432866 U CN201120432866 U CN 201120432866U CN 202305631 U CN202305631 U CN 202305631U
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Abstract
The utility model discloses an optical-fiber-type current transformer including a light source, a detector and a data collector. The detector is composed of first double refraction crystal, a Faraday magneto-optical crystal, a second double refraction crystal, a first optical fiber collimator and a second optical fiber collimator. In the utility model, the first double refraction crystal is adopted on an input terminal for polarizing detection light, and the second refraction crystal is adopted on the output terminal for de-polarizing the detection light. Thus, a polarized light source and a polarization-retaining optical fiber are avoided to use, thereby eliminating the dependence of the optical-fiber-type current transformer on optical polarization. Compared with the prior art, the light path compatibility of the optical-fiber-type current transformer is good. Since the detector adopts the double refraction crystals, influences from environmental factors are extremely small. At the same time, since the detector adopts an insulation compact packaging method, influence from environmental vibration and temperature drift on detection results is reduced. And the light source in the utility model adopts a feedback-type control method. Thus, the sensibility and the precision of the detection can be guaranteed.
Description
Technical field:
The utility model relates to current transformer, specifically is a kind of optical fiber type current transformer, is used for electric system relay protection and electric energy metrical.
Background technology:
Current transformer (be called for short CT) is the visual plant of relay protection and electric energy metrical in the electric system, and safety, the stable operation of its long-time stability, reliability, security and electric system are closely related.
Along with electric system develops to high capacity, high-tension direction, power equipment has been proposed the requirement of miniaturization, robotization, high reliability.At present current transformer commonly used mainly is an electromagnetic current transducer in the electric system, its utilize electromagnetic induction principle with on high-tension side current conversion to low-pressure side, problems such as volume is big, cost is high, insulation system is complicated, magnetic saturation phenomenon that it exists.
Number of patent application 2009202260811; The patent that name is called " all-fiber current transformator " discloses a kind of optical fiber current mutual inductor based on Faraday magnetooptical effect; The used light source of current transformer of this method design is a polarized light; Guarantor's bias to Transmission Fibers is strict, and construction costs is high; Simultaneously, the input of being monitored, output light are open loop control, receive the influence of ambient vibration and temperature drift easily, can't keep degree of accuracy at great dynamic range.
The utility model content:
For this reason; The purpose of the utility model is to provide the optical fiber type current transformer that a kind of reliability is high, volume is little, optical polarization is irrelevant, cost is low; Exist reliability low to solve present optical fiber current mutual inductor, the problem that construction costs is high, can't keep degree of accuracy at great dynamic range.
For realizing above-mentioned purpose, the utility model mainly adopts following technical scheme:
A kind of optical fiber type current transformer; Comprise light source (1), detector (3), data acquisition unit (6) and computer (7); Said detector (3) is near high voltage bus; Said detector (3) is made up of first birefringece crystal (301), Faraday magneto-optical crystal (302), second birefringece crystal (303), first optical fiber collimator (304), second optical fiber collimator (305); Said first optical fiber collimator (304) is connected with first birefringece crystal (301); First birefringece crystal (301) is connected with second birefringece crystal (303) through Faraday magneto-optical crystal (302), and second birefringece crystal (303) is connected with second optical fiber collimator (305), and said second optical fiber collimator (305) is connected with data acquisition unit (6) through second photoelectric tube (5); Said light source (1) is through single-mode fiber (2) output one road reference light and one tunnel measuring light, and said reference light is input to first photoelectric tube (4), is input to data acquisition unit (6) after changing into electric signal; Said measuring light is input to first optical fiber collimator (304) of detector (3); Be transformed into collimated light and be input to first birefringece crystal (301); To Faraday magneto-optical crystal (302), in Faraday magneto-optical crystal (302),, produce deflection through first birefringece crystal (301) back output two-way light beam through the action of a magnetic field of the tested electric current of high voltage bus; Two-beam after the deflection is input to second birefringece crystal (303); Be transformed into collimated light output by being input to second optical fiber collimator (305) after second birefringece crystal (303) the generation refraction, this collimated light is imported second photoelectric tube (5), changes into electric signal input data acquisition unit (6).
Wherein said light source (1) is connected with a fiber coupler through single-mode fiber (2), and the light that light source (1) is sent through this fiber coupler is divided into a road identical measuring light of light intensity and one road reference light.
Wherein said data acquisition unit (6) is connected to computer (7); Computer (7) is connected with light source (1); The electric signal that electric signal that data acquisition unit (6) changes into reference light and measuring light change into compares; And comparative result sent to computer analysis, computer is controlled adjustment according to analysis result to the luminous intensity of light source (1).
Wherein said light source (1) is optical polarization pointolite or non-optical polarization pointolite.
Wherein said detector (3) also comprises a sealed insulation housing, and said first birefringece crystal (301), Faraday magneto-optical crystal (302), second birefringece crystal (303), first optical fiber collimator (304), second optical fiber collimator (305) are fixedly mounted in the sealing insulation shell.
The utility model adopts first birefringece crystal that measuring light is risen partially at the input end of Faraday magneto-optical crystal; Output terminal adopts second birefringece crystal that measuring light is separated partially; Avoided use polarized light source and polarization maintaining optical fibre, thereby eliminated of the dependence of optical fiber type current transformer optical polarization.Compared with prior art, the utility model light path compatibility is good; Simultaneously detector adopts the insulation compact package to reduce ambient vibration and the temperature drift influence to measurement result; And the control of the light source of the utility model employing reaction type, can guarantee sensitivity and the degree of accuracy measured.
Description of drawings:
Fig. 1 is the system architecture synoptic diagram of the utility model optical fiber type current transformer.
Fig. 2 is the cross section structure synoptic diagram of the utility model optical fiber type current transformer detector.
Fig. 3 is the light path synoptic diagram of the utility model optical fiber type current transformer detector.
Identifier declaration among the figure: light source 1, single-mode fiber 2, detector 3, first birefringece crystal 301, Faraday magneto-optical crystal 3 02, second birefringece crystal 303, first optical fiber collimator 304, second optical fiber collimator 305, first photoelectric tube 4, second photoelectric tube 5, data acquisition unit 6, computer 7.
Embodiment:
For setting forth the thought and the purpose of the utility model, will combine accompanying drawing and specific embodiment that the utility model is done further explanation below.
See also shown in Figure 1ly, Fig. 1 is the system architecture synoptic diagram of the utility model optical fiber type current transformer.The utility model provides the optical fiber type current transformer that a kind of reliability is high, volume is little, optical polarization is irrelevant, cost is low; Exist reliability low to solve present optical fiber current mutual inductor, the problem that construction costs is high, can't keep degree of accuracy at great dynamic range.
Wherein this optical fiber type current transformer comprises light source 1, single-mode fiber 2, detector 3, first photoelectric tube 4, second photoelectric tube 5, data acquisition unit 6 and computer 7.
Light source 1 can adopt the optical polarization pointolite, also can adopt non-optical polarization pointolite, and preferred in the utility model what adopt is non-optical polarization pointolite; To avoid adopting the optical polarization pointolite; Guarantor's bias to optical fiber is strict, and reliability is low, problems such as construction costs height.
Light source 1 is connected with single-mode fiber 2, and these single-mode fiber 2 latter ends are connected with a fiber coupler, can the light that light source 1 sends be divided into a road identical measuring light of light intensity and one road reference light through this fiber coupler.
Measuring light is input to detector 3, and this detector 3 through outputing to second photoelectric tube 5 after detector 3 processing, changes into electric signal by second photoelectric tube 5 near high voltage bus, is input to data acquisition unit 6; Reference light is input to first photoelectric tube 4; After transforming, become electric signal, also correspondence is input to data acquisition unit 6, and 6 pairs of electric signal from first photoelectric tube 4 and second photoelectric tube 5 of data acquisition unit carry out being input to computer 7 after the difference; Carry out analyzing and processing through computer 7, calculate the electric current of surveying.
As shown in Figure 2, Fig. 2 is the cross section structure synoptic diagram of the utility model optical fiber type current transformer detector.Wherein said detector 3 comprises a sealed insulation housing, is installed with first birefringece crystal 301, Faraday magneto-optical crystal 3 02, second birefringece crystal 303, first optical fiber collimator 304, second optical fiber collimator 305 in the sealing insulation shell.
First optical fiber collimator 304 is connected with first birefringece crystal 301; First birefringece crystal 301 is connected with second birefringece crystal 303 through Faraday magneto-optical crystal 3 02; Second birefringece crystal 303 is connected with second optical fiber collimator 305, and said second optical fiber collimator 305 is connected with data acquisition unit 6 through second photoelectric tube 5; Said light source 1 is through single-mode fiber 2 output one road reference light and one tunnel measuring light, and said reference light is input to first photoelectric tube 4, is input to data acquisition unit 6 after changing into electric signal; Said measuring light is input to first optical fiber collimator 304 of detector 3; Be transformed into collimated light and be input to first birefringece crystal 301; Arrive Faraday magneto-optical crystal 3 02 through first birefringece crystal, 301 back output two-way light beams; In Faraday magneto-optical crystal 3 02, pass through the action of a magnetic field of the tested electric current of high voltage bus; Produce deflection, the two-beam after the deflection is input to second birefringece crystal 303, is transformed into collimated light output by being input to second optical fiber collimator 305 after the 303 generation refractions of second birefringece crystal.
The principle of work of the utility model is: at first to send light intensity be I to light source 1
0Initial light be divided into a road identical measuring light of light intensity and one road reference light; Measuring light enters into first birefringece crystal 301 through first optical fiber collimator 304 and is divided into a branch of o light and a branch of e light, and the o light of this moment and the light intensity of e light are respectively xI
0, (1-x) I
0(wherein x is the beam split rate); O light and e light get into Faraday magneto-optical crystal 3 02 afterwards, under the action of a magnetic field that tested electric current produces, polarization state deflection take place; Its deflection angle is that (V is a Verdet constant to θ=VBL; B is a magnetic field intensity, and L is a magneto-optical crystal length), become o ' light and e ' light; O ' light and e ' light enter into second birefringece crystal 303 again, and o ' anaclasis is e
o' and o
o' two-beam, e ' anaclasis are oe ' and e
e' two-beam, o
o' and e
e' form light intensity stack, wherein e at the second birefringece crystal output terminal
oDeflecting away from light intensity is axI
0, o
e' deflect away from light intensity and be (1-a) (1-x) I
0, (wherein a is for deflecting away from coefficient); The light intensity that is coupled to second optical fiber collimator 305 afterwards is (1-a) I
0, 6 pairs of electric signal from first photoelectric tube 4 and second photoelectric tube 5 of data acquisition unit carry out exporting aI after the difference
0, carry out analyzing and processing through computer 7, calculate the current i of surveying=π α arccos (2a-1)/μ.VL (μ wherein.Be magnetic permeability, α is the distance of detector 3 to hi-line, and L is the length of Faraday magneto-optical crystal).The index path synoptic diagram is as shown in Figure 3.
More than be that a kind of optical fiber type current transformer that the utility model is provided has carried out detailed introduction; Used concrete example among this paper the structural principle and the embodiment of the utility model are set forth, above embodiment just is used to help to understand the method and the core concept thereof of the utility model; Simultaneously, for one of ordinary skill in the art, according to the thought of the utility model, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the utility model.
Claims (9)
1. optical fiber type current transformer; Comprise light source (1), detector (3), data acquisition unit (6) and computer (7); Said detector (3) is near high voltage bus; It is characterized in that said detector (3) is made up of first birefringece crystal (301), Faraday magneto-optical crystal (302), second birefringece crystal (303), first optical fiber collimator (304), second optical fiber collimator (305); Said first optical fiber collimator (304) is connected with first birefringece crystal (301); First birefringece crystal (301) is connected with second birefringece crystal (303) through Faraday magneto-optical crystal (302), and second birefringece crystal (303) is connected with second optical fiber collimator (305), and said second optical fiber collimator (305) is connected with data acquisition unit (6) through second photoelectric tube (5); Said light source (1) is through single-mode fiber (2) output one road reference light and one tunnel measuring light, and said reference light is input to first photoelectric tube (4), is input to data acquisition unit (6) after changing into electric signal; Said measuring light is input to first optical fiber collimator (304) of detector (3); Be transformed into collimated light and be input to first birefringece crystal (301); To Faraday magneto-optical crystal (302), in Faraday magneto-optical crystal (302),, produce deflection through first birefringece crystal (301) back output two-way light beam through the action of a magnetic field of the tested electric current of high voltage bus; Two-beam after the deflection is input to second birefringece crystal (303); Be transformed into collimated light output by being input to second optical fiber collimator (305) after second birefringece crystal (303) the generation refraction, this collimated light is imported second photoelectric tube (5), changes into electric signal input data acquisition unit (6).
2. optical fiber type current transformer according to claim 1; It is characterized in that said light source (1) is connected with a fiber coupler through single-mode fiber (2), the light that light source is sent through this fiber coupler is divided into a road identical measuring light of light intensity and one road reference light.
3. optical fiber type current transformer according to claim 1; It is characterized in that said data acquisition unit (6) is connected to computer (7); Computer (7) is connected with light source (1); The electric signal that electric signal that data acquisition unit (6) changes into reference light and measuring light change into compares, and comparative result is sent to computer analysis, and computer is controlled adjustment according to analysis result to the luminous intensity of light source (1).
4. optical fiber type current transformer according to claim 1 is characterized in that said light source (1) is optical polarization pointolite or non-optical polarization pointolite.
5. optical fiber type current transformer according to claim 1; It is characterized in that said detector (3) also comprises a sealed insulation housing, said first birefringece crystal (301), Faraday magneto-optical crystal (302), second birefringece crystal (303), first optical fiber collimator (304), second optical fiber collimator (305) are fixedly mounted in the sealing insulation shell.
6. optical fiber type current transformer according to claim 1 is characterized in that said birefringece crystal can adopt vanadic acid yttrium (YVO4) crystal or titanium dioxide crystal (TiO2).
7. optical fiber type current transformer according to claim 1, it is characterized in that said birefringece crystal must satisfy: thermal expansivity and thermo-optical coeffecient are little, and refractive index inhomogeneity is little, and transmitance is high, and hardness is big.
8. optical fiber type current transformer according to claim 1 is characterized in that the length L of said birefringece crystal satisfies formula: L >=d/tan ρ, and the walk-off angle when wherein ρ is 45 ° of optical axis and incident interface angles, d is the single-mode fiber clear aperature.
9. optical fiber type current transformer according to claim 1 is characterized in that said first birefringece crystal and second birefringece crystal are in full accord, can be head and the tail in opposite directions with tail tail two kinds of array modes in opposite directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204328661U CN202305631U (en) | 2011-11-04 | 2011-11-04 | Optical-fiber-type current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204328661U CN202305631U (en) | 2011-11-04 | 2011-11-04 | Optical-fiber-type current transformer |
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| CN202305631U true CN202305631U (en) | 2012-07-04 |
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| CN2011204328661U Expired - Fee Related CN202305631U (en) | 2011-11-04 | 2011-11-04 | Optical-fiber-type current transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830258A (en) * | 2012-08-24 | 2012-12-19 | 易能（中国）电力科技有限公司 | Optical current sensing system and current measuring method |
| CN103091528A (en) * | 2011-11-04 | 2013-05-08 | 深圳市众望达光电有限公司 | Optical fiber current transformer |
| CN103197114A (en) * | 2013-01-10 | 2013-07-10 | 北京航空航天大学 | Novel reflection type reciprocity optical voltage mutual inductor and optical path design method thereof |
| CN109839546A (en) * | 2019-03-19 | 2019-06-04 | 浙江大学 | The fixation device of sonde configuration in a kind of reflective micro-optical electric-field sensor |
-
2011
- 2011-11-04 CN CN2011204328661U patent/CN202305631U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091528A (en) * | 2011-11-04 | 2013-05-08 | 深圳市众望达光电有限公司 | Optical fiber current transformer |
| CN103091528B (en) * | 2011-11-04 | 2015-09-16 | 深圳市众望达光电有限公司 | A kind of optical-fiber-type current transformer |
| CN102830258A (en) * | 2012-08-24 | 2012-12-19 | 易能（中国）电力科技有限公司 | Optical current sensing system and current measuring method |
| CN103197114A (en) * | 2013-01-10 | 2013-07-10 | 北京航空航天大学 | Novel reflection type reciprocity optical voltage mutual inductor and optical path design method thereof |
| CN103197114B (en) * | 2013-01-10 | 2015-04-15 | 北京航空航天大学 | Novel reflection type reciprocity optical voltage mutual inductor and optical path design method thereof |
| CN109839546A (en) * | 2019-03-19 | 2019-06-04 | 浙江大学 | The fixation device of sonde configuration in a kind of reflective micro-optical electric-field sensor |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20201104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |