CN102253272A - Current measurement and protective sensor for high-voltage alternating current - Google Patents
Current measurement and protective sensor for high-voltage alternating current Download PDFInfo
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- CN102253272A CN102253272A CN201110112397XA CN201110112397A CN102253272A CN 102253272 A CN102253272 A CN 102253272A CN 201110112397X A CN201110112397X A CN 201110112397XA CN 201110112397 A CN201110112397 A CN 201110112397A CN 102253272 A CN102253272 A CN 102253272A
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- 238000005259 measurement Methods 0.000 title claims abstract description 26
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- 239000013307 optical fiber Substances 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 2
- 230000005408 paramagnetism Effects 0.000 claims description 2
- 238000007639 printing Methods 0.000 claims description 2
- 230000006870 function Effects 0.000 abstract description 9
- 238000001228 spectrum Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 4
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- 230000005389 magnetism Effects 0.000 description 3
- 230000001953 sensory effect Effects 0.000 description 2
- 241000220225 Malus Species 0.000 description 1
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Abstract
The invention provides a high-voltage alternating current sensor which integrates functions of measurement and protection by using the frequency spectrum technology based on the alternating-current magneto-optic modulation theory and the Ampere circuital theorem. By the high-voltage alternating current sensor, the high-accuracy measurement requirement of common current and the high-accuracy measurement and protection requirement of heavy current also can both be met. A 2-times frequency component (2 omega), 4-times frequency component (4 omega), 8-times frequency component (8 omega) and 10-times frequency component (10 omega) are selected respectively by a filter; the amplitude of the 4-times frequency component is divided by the amplitude of the 2-times frequency component to be used for measuring the common current; and the amplitude of the 10-times frequency component is divided by the amplitude of the 8-times frequency component to be used for measuring and protecting the ultra-heavy current. The high-voltage alternating current sensor can be better applied in the field of high-voltage current sensing.
Description
Technical field
The present invention relates to a kind of High Level AC Voltage current measurement and protection sensor, belong to the technical field of Photoelectric Detection, photoelectric sensing and optical information processing.
Background technology
Magnetooptics is an ancient and unfailing subject, and it in the application in optical detection and photoelectric sensing field more and more widely; Wherein using maximum is Faraday magnetooptical effect, comprises current sensor, magnetic field sensor, magneto-optic modulator, magneto optic isolator, magneto-optic circulators etc.
[1]Spread all over a plurality of optical fields such as light detection, light sensing, optical communication.
Based on the optical current sensor (OCT) of Faraday magnetooptical effect because have good insulating, no magnetic saturation, advantage such as anti-electromagnetic interference capability is strong, dynamic range is big
[2], the trend that replaces the electronic current sensor is gradually arranged.Both at home and abroad about the research of OCT since the seventies in last century, the A.J.Rogers in Britain electric power research centre in 1977
[3], A.M.Smith
[4]With people such as German A.Papp
[5]All-fiber current sensor is furtherd investigate.But the full fiber type current sensor is because the intrinsic birefringence problem of optical fiber itself is difficult to solve, and people have turned to block glass mould sensing head structure with sight.This sensor is in U.S.'s linked network success on the electrical network at 1200kV in 1980
[6]The research of China OCT was held in Shanghai with nineteen eighty-two " forum of laser commercial Application " is starting, plays academic research the nineties and be tending towards active.Wherein the Wang Zhengping of Harbin Institute of Technology teaches
[7], the Central China University of Science and Technology Li Hongbin professor
[8], Northwestern Polytechnical University Zhao Jianlin professor
[9], the Shanghai Communications University, Xi'an Liu Ye professor
[10]Deng all having made a lot of useful researchs in the OCT field.People such as the Zhao Weizhong of Zhejiang University, Zhang Shouye are doing a lot of work aspect the Magnetooptic current sensing material, develop several high performance magneto-optic memory techniques
[11]
Accuracy of detection is everybody striving direction as the leading indicator of OCT always, and in order to improve accuracy of detection, common way is to adopt the magneto-optic memory technique of high Verdet constant
[11]Repeatedly light path is around waiting sensing head structure
[7,13], the accuracy of detection of this class sensor is higher, but their sensing range is generally below 10KA, and if under the especially big electric current of 50KA magnitude, their magneto-optic modulation angle will surpass the monotone area of 90 these sine functions of degree.Many loop currents sensor as people such as Y.N.Ning research promptly reaches 90 ° of scopes about 4KA
[12], the sensitivity of the high-tension current sensor of Wang Zheng equality people research is 6.57 * 10
-5Rad/A, then the current value modulated angle at 24KA promptly reaches more than 90 °
[7]And also not having related application at present greater than the detection of the 90 big modulation angles of spending, this has just limited the sensing range of electric current, does not accomplish the measurement and the protection of big electric current.In order to improve the sensing range of electric current, can use the technological means such as magneto-optic memory technique of low Verdet constant, but reduce accuracy of detection.Therefore, general electric current high-acruracy survey is difficult to be integrated in one with big two kinds of functions of current protection.Given this, this patent is set about from two aspects, the one, adopt the magneto-optic memory technique of high Verdet constant and light path around etc. method to improve the accuracy of detection of electric current; The 2nd, adopt spectrum analysis technique, realization detects the big modulation angles greater than 90 degree, thereby effectively improves the sensing range of electric current, therefore can be integrated in one measuring with protecting both.Transformation and construction along with following 10 years national intelligent grids; electric current and electric pressure will constantly get a promotion; the above especially big electric current of 50KA will be no longer rare, and therefore, the current sensor that it is one that collection is measured with two kinds of functions of protection will have more wide application prospect.
The present invention is based on AC magnetism optical modulation theory and Amp; propose to measure and two kinds of High Level AC Voltage current sensors that function is an one of protection a kind of the collection; both can satisfy the high-acruracy survey of general electric current, also can satisfy the high-acruracy survey and the protection of especially big electric current.The invention of this patent achievement can well be applied to the high-tension current sensory field.
List of references
[1] Liu Gongqiang, happy will is strong, Shen Defang etc. magnetooptics [M]. and Shanghai: Shanghai science tech publishing house, 2001:36,192～229
[2]Meirong?Wang，Jianlin?Zhao，Sheng?Liu，etal.Optical?current?sensor?immuneto?reflection?phase?shift?based?on?graded-index?magneto-opticalglass[J].APPLIED?OPTICS.2009，48(32)：6264-6270
[3]A.J.Rogers.Optical?Technique?for?the?Measurement?of?Voltage?and?Currenton?Power?Systems[J].Optics?and?Laser?Technology，1977，(12)：273-283
[4]A.M.Smith.Optical?Fibers?for?Current?Measurement?Applications.Opticsand?Laser?Technology，1980，(2)：25-29
[5]A.Papp，H.Harms.Magneto-Optical?Current?Transformerl：Principles[J].Appl?ied?Optics，1980，19(22)：3729-3734
[6]T.W.Cease，P.Johnston.A?Magneto-Optic?Current?Transformer[J].IEEETrans.on?Power?Delivery.1990，5(5)：548-555
[7] Wang Zhengping, Sun Weimin. a kind of research [J] of novel many ring light path optical current sensors. photon journal, 1996.25 (9): 831-834
[8] Li Hongbin. the research of optical current sensor sensing head [J]. optics journal, 1997,17 (7): 946-949
[9] Wang Meirong, Zhou Wangmin, Zhao Jianlin etc. based on reflection-type faraday's fibre optic current sensor [J] of BGO crystal. photon journal, 2008,37 (6): 1186-1190
[10] Liu Ye, Wang Feng, Wei Zhaobi etc. the structure of Sensing Heads for Optical Current Transducer and principle [J]. sensor technology, 2002,11:3-9
[11] Zhao Weizhong, Zhang Shouye, Huang Min. the Bi rare earth iron garnet single crystal of mixing that is used for fibre optic current sensor is grown and magneto-optical property [J]. optics journal, 2000,20 (12): 1694-1698
[12]Y.N.Ning，B.C.B.Chu，D.A.Jackson.Miniature?Faraday?current?sensor?basedon?multiple?critical?angle?reflections?in?a?bulk-optic?ring[J].OPTICSLETTERS，1991，16(24)：1996～1998
Summary of the invention
Technical matters: the objective of the invention is to propose a kind of High Level AC Voltage current measurement and protection sensor, the current sensor problem that the solution general current measurement of collection and two kinds of functions of especially big current protection are one.
Technical scheme: High Level AC Voltage current measurement of the present invention is connected in proper order to be connected with to put by laser instrument, convex lens, first optical fiber, first GRIN Lens, first polarizer, current sensing head, second polarizer, second GRIN Lens, second optical fiber, photodetector, signal processing unit with the protection sensor and is connected and composed.
Current sensing head adopts the block structure sensing head of being made by magneto-optic memory technique, and the centre has a hole to be used to pass current lead; It is repeatedly reflective that sensing head adopts, make incident ray center on current lead after, export from opposite side.
First polarizer, the second polarizer printing opacity direction mutually orthogonal are placed.The employed magneto-optic memory technique of sensing head adopts paramagnetism magneto-optic memory technique or magneto-optical crystal.
Signal processing unit comprises wave filter, first divider and second divider; The output terminal of wave filter send first divider with quadruple signal in the light intensity signal and two frequency-doubled signals, and first divider is divided by quadruple signal in the light intensity signal and two frequency-doubled signals, is used for the measurement of the following electric current of 20KA; The output terminal of wave filter send second divider with ten frequency-doubled signals in the light intensity signal and octonary signal, and ten frequency-doubled signals in the light intensity signal and octonary signal are divided by, and is used for the measurement and the protection of the above electric current of 50KA.
Beneficial effect: according to above narration as can be known, the present invention has following characteristics:
The present invention is based on AC magnetism optical modulation theory and Amp; propose to measure and two kinds of High Level AC Voltage current sensors that function is an one of protection a kind of the collection; both can satisfy the high-acruracy survey of general electric current, also can satisfy the high-acruracy survey and the protection of especially big electric current.The invention of this patent achievement can well be applied to the high-tension current sensory field.
Description of drawings
Fig. 1 is High Level AC Voltage current measurement of the present invention and protection sensing system structural representation,
Have among the figure: laser instrument 1, convex lens 2, first optical fiber 3, first GRIN Lens 4, first polarizer 5, current sensing head 6, second polarizer 7, second GRIN Lens 8, second optical fiber 9, photodetector 10, signal processing unit 11.
Fig. 2 signal processing unit synoptic diagram has wave filter 11.1, first divider 11.2, second divider 11.3 among the figure.
Relative spectrum signal range value of Fig. 3 and modulation angular dependence figure (4 ω/2 ω).
Relative spectrum signal range value of Fig. 4 and modulation angular dependence figure (10 ω/8 ω).
Embodiment
High Level AC Voltage current measurement of the present invention and protection sensor equipment therefor are as depicted in figs. 1 and 2.Laser instrument 1 sends among Fig. 1 light is coupled into first Transmission Fibers, 3 backs from 4 outputs of first GRIN Lens through convex lens 2, and vertical incidence becomes linearly polarized light to the polarizer 5 and enters current sensing head 6.In sensing head, under the modulation of alternating current, carried the modulation angle information from the output terminal outgoing, be coupled into second by second polarizer, 7 backs by second GRIN Lens 8 and go into optical fiber 9, survey light intensity signal and export signal processing unit 11 to by photodetector 10 at last.Signal processing unit 11 as shown in Figure 2, the electric signal of photodetector 10 output is selected 2 frequency multiplication components (2 ω), 4 frequency multiplication components (4 ω), 8 frequency multiplication components (8 ω) and 10 frequency multiplication components (10 ω) respectively through wave filter 1.The amplitude of 4 frequency multiplication components can be used to detect general electric current divided by 2 frequency multiplication component amplitude; The amplitude of 10 frequency multiplication components can be used for the detection of especially big electric current divided by 8 frequency multiplication component amplitude.
High Level AC Voltage i=i
0Sin ω t produces alternating magnetic field H=H around lead
0Sin ω t, the AC magnetism optical modulation angle of generation is
θ＝θ
0sinωt (1)
If through the incident intensity behind the polarizer 5 is I
0, then according to Malus law, receiving light power is:
I＝I
0sin
2θ＝I
0sin
2(θ
0sinωt) (2)
By formula (2) relative light intensity be:
Utilize Bessel's function that formula (3) abbreviation is obtained:
Wherein, J
2n(2 θ
0) be Bessel function of the first kind.
By formula (4) as seen, comprising DC component and frequency in the light intensity signal is 2n ω (n=1,2,3 ...) a series of AC compounent, the amplitude of AC compounent is the absolute value of AC compounent coefficient.
4 ω component amplitude divided by 2 ω components, are obtained relative ratio and the relation of modulating angle, and as shown in Figure 3, this ratio is dull increasing in 140 degree scopes, therefore can be as 140 detections of spending with the internal modulation angle, and this moment can be as the detection of general electric current.With 10 ω component amplitude divided by 8 ω component amplitude; obtain relative ratio and the relation of modulating angle, as shown in Figure 4, this ratio is dull increasing in 340 degree scopes; therefore can be as of the detection of 340 degree with the internal modulation angle, this moment can be as the measurement protection of especially big electric current.
Owing to adopt the signal processing technology of being divided by, can also eliminate the influence of factors such as light source luminescent power instability and light absorption.
A kind of High Level AC Voltage current measurement of the present invention and protection sensor equipment therefor are as depicted in figs. 1 and 2.The light that laser instrument 1 sends among Fig. 1 is coupled into first Transmission Fibers, 3 backs from 4 outputs of first GRIN Lens through convex lens 2, becomes linearly polarized light behind vertical incidence to the first polarizer 5 and enters current sensing head 6.In sensing head, under the modulation of alternating current, carried the modulation angle information from the output terminal outgoing, be coupled into second optical fiber 9 by second polarizer, 7 backs by second GRIN Lens 8, survey light intensity signal and export signal processing unit 11 to by photodetector 10 at last.Signal processing unit 11 as shown in Figure 2, the electric signal of photodetector 10 output is selected 2 frequency multiplication components (2 ω), 4 frequency multiplication components (4 ω), 8 frequency multiplication components (8 ω) and 10 frequency multiplication components (10 ω) respectively through wave filter 11.1.The amplitude of 4 frequency multiplication components can be used to detect general electric current divided by 2 frequency multiplication component amplitude; The amplitude of 10 frequency multiplication components can be used for the detection of especially big electric current divided by 8 frequency multiplication component amplitude.
When High Level AC Voltage is i=i
0During sin ω t, around lead, produce alternating magnetic field H=H
0The magneto-optic of linearly polarized light modulation angle is θ=θ in the sin ω t, sensing head
0Sin ω t.When electric current is general electric current, by measuring the size of relative spectrum amplitude value (4 ω/2 ω) value, according to relative spectrum amplitude value (4 ω/2 ω) value among Fig. 3 and modulation angle θ
0Relation draw θ
0Size, according to Faraday effect principle θ=VLH (θ is faraday's rotation angle, and V is the Verdet constant of magneto-optic memory technique, and L is an optical path length, and H is a magnetic field intensity), draw H again
0Size, at last by Amp
Draw general current i
0Size, thereby finish the measurement of general electric current.
A kind of High Level AC Voltage current measurement of the present invention and protection sensor equipment therefor are as depicted in figs. 1 and 2.Laser instrument 1 sends among Fig. 1 light is coupled into Transmission Fibers 3 backs from GRIN Lens 4 outputs through convex lens 2, and vertical incidence becomes linearly polarized light to the polarizer 5 and enters current sensing head 6.In sensing head, under the modulation of alternating current, carried the modulation angle information from the output terminal outgoing, be coupled into optical fiber 9 by GRIN Lens 8, surveyed light intensity signal and export signal processing unit 11 to by photodetector 10 at last by polarizer 7 backs.Signal processing unit 11 as shown in Figure 2, the electric signal of photodetector 10 output is selected 2 frequency multiplication components (2 ω), 4 frequency multiplication components (4 ω), 8 frequency multiplication components (8 ω) and 10 frequency multiplication components (10 ω) respectively through wave filter 11.1.The amplitude of 4 frequency multiplication components can be used to detect general electric current divided by 2 frequency multiplication component amplitude; The amplitude of 10 frequency multiplication components can be used for the detection of especially big electric current divided by 8 frequency multiplication component amplitude.
When High Level AC Voltage is i=i
0During sin ω t, around lead, produce alternating magnetic field H=H
0The magneto-optic of linearly polarized light modulation angle is θ=θ in the sin ω t, sensing head
0Sin ω t.When electric current is especially big electric current, by measuring the size of relative spectrum amplitude value (10 ω/8 ω) value, according to relative spectrum amplitude value (10 ω/8 ω) value among Fig. 4 and modulation angle θ
0Relation draw θ
0Size, according to Faraday effect principle θ=VLH (θ is faraday's rotation angle, and V is the Verdet constant of magneto-optic memory technique, and L is an optical path length, and H is a magnetic field intensity), draw H again
0Size, at last by Amp
Draw especially big current i
0Size, thereby finish the measurement and the protection of especially big electric current.
Claims (5)
1. High Level AC Voltage current measurement and protection sensor is characterized in that this sensor is connected with to put and is connected and composed by laser instrument (1), convex lens (2), first optical fiber (3), first GRIN Lens (4), first polarizer (5), current sensing head (6), second polarizer (7), second GRIN Lens (8), second optical fiber (9), photodetector (10), the series connection of signal processing unit (11) order.
2. High Level AC Voltage current measurement as claimed in claim 1 and protection sensor is characterized in that current sensing head (6) adopts the block structure sensing head of being made by magneto-optic memory technique, and the centre has a hole to be used to pass current lead; It is repeatedly reflective that sensing head adopts, make incident ray center on current lead after, export from opposite side.
3. High Level AC Voltage current measurement as claimed in claim 1 and protection sensor is characterized in that first polarizer (5), the placement of second polarizer (7) printing opacity direction mutually orthogonal.
4. High Level AC Voltage current measurement as claimed in claim 2 and protection sensor is characterized in that the employed magneto-optic memory technique of sensing head adopts paramagnetism magneto-optic memory technique or magneto-optical crystal.
5. High Level AC Voltage current measurement as claimed in claim 1 and protection sensor is characterized in that signal processing unit (11) comprises wave filter (11.1), first divider (11.2) and second divider (11.3); The output terminal of wave filter (11.1) send first divider (11.2) with quadruple signal in the light intensity signal and two frequency-doubled signals, and first divider (11.2) is divided by quadruple signal in the light intensity signal and two frequency-doubled signals, is used for the measurement of the following electric current of 20KA; The output terminal of wave filter (11.1) send second divider (11.3) with ten frequency-doubled signals in the light intensity signal and octonary signal, and ten frequency-doubled signals in the light intensity signal and octonary signal are divided by, and is used for the measurement and the protection of the above electric current of 50KA.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546867A (en) * | 2017-01-10 | 2017-03-29 | 上海理工大学 | Based on garnet optics leakage current sensor |
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| CN101846703A (en) * | 2009-03-23 | 2010-09-29 | 徐启峰 | Digital optical fiber current sensor |
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2011
- 2011-04-29 CN CN 201110112397 patent/CN102253272B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| US5696858A (en) * | 1996-08-01 | 1997-12-09 | The Texas A&M University System | Fiber Optics apparatus and method for accurate current sensing |
| CN2403033Y (en) * | 1999-12-02 | 2000-10-25 | 哈尔滨工程大学 | Optical current sensor |
| US7046867B2 (en) * | 2003-02-14 | 2006-05-16 | Abb Research Ltd | Fiberoptic current sensor having a plurality of sensor heads |
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|---|
| 陈毅: "贝塞尔函数比值法求定干涉型光纤水听器相移幅值的模拟试验和精度分析", 《声学与电子工程》 * |
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| CN106546867A (en) * | 2017-01-10 | 2017-03-29 | 上海理工大学 | Based on garnet optics leakage current sensor |
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