CN103163351B - A kind of optical voltage sensor of three-phase common light source - Google Patents
A kind of optical voltage sensor of three-phase common light source Download PDFInfo
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- CN103163351B CN103163351B CN201110418222.1A CN201110418222A CN103163351B CN 103163351 B CN103163351 B CN 103163351B CN 201110418222 A CN201110418222 A CN 201110418222A CN 103163351 B CN103163351 B CN 103163351B
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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
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Abstract
A kind of optical voltage sensor of three-phase common light source, the light that light source sends is divided into three beams through optical branching device, the polarizer that input three is corresponding after three optical fiber collimators of correspondence expand, the linearly polarized light that three polarizers export converts circularly polarized light to through three corresponding quarter wave plates, three beams circularly polarized light inputs three blocks of corresponding electro-optic crystals, divide through three corresponding polarization beam apparatus the linearly polarized light be orthogonal after outgoing, six bundle light are respectively through six corresponding optical fiber collimator coupled into optical fibres, six photodetectors and amplifying circuit convert the light intensity of six of correspondence bundle light to voltage signal respectively, voltage signal is converted to digital signal and to go forward side by side row operation process by Signal acquiring and processing circuit, export the value of three-phase voltage to be measured.The present invention can reduce three-phase voltage that light source center wavelength and changed power cause and measure consistance and worsen, and is easy to realize the integrated of three phase optical voltage sensor simultaneously, is particularly suitable for the requirement that electrical network is measured three-phase voltage simultaneously.
Description
Technical field
The present invention relates to a kind of optical voltage sensor, particularly based on the optical voltage sensor of the three-phase common light source of Pockels electrooptical effect.
Background technology
Voltage sensor is the most basic measuring equipment of Automation of Electric Systems, for electric system is provided for measuring, controls and the necessary information of relay protection, has a wide range of applications in electric system.Along with the power capacity of electrical power system transmission is increasing, electric pressure is more and more higher, traditional induction or capacitive divided voltage sensor, because of the restriction of its sensor mechanism, shows many limitation being difficult to overcome in insulation, bandwidth, dynamic range, output interface, security, weight, volume etc.
Optical voltage sensor is the novel sensor utilizing photoelectron technology and optical fiber sensing technology to measure to realize power system voltage.Compare with capacitance partial pressure voltage sensor with traditional electromagnetic potential sensor, the outstanding advantages of optical voltage sensor is: use optical cable instead of cable as Signal transmissions instrument, achieve the thorough isolation of high-pressure side and low pressure end, security is high; High-voltage signal is by insulating material Optical Fiber Transmission to secondary device, and this makes its insulation system greatly simplify; Do not have iron core, there is not magnetic saturation ferroresonance phenomenon, sensor stability is good, and system reliability is high; Can realize voltage measurement and relay protection two kinds of functions, and structure is simple, measuring accuracy is high simultaneously; Frequency response is wide, and dynamic range is large; Volume is little, lightweight, is convenient to transport and installs; Pollution-free, noiselessness, has superior environmental-protecting performance; Output digit signals, can adapt to the needs of electric power digital, intellectuality and networking, and can realize on-line checkingi and fault diagnosis.Because optical voltage sensor has above-mentioned numerous outstanding advantage, therefore it has very wide application prospect in electric system.
Optical voltage sensor utilizes the perception of Pockels effect realization to voltage usually, as shown in Figure 1: under the effect of external electrical field, the polarization state of the light wave transmitted in electro-optic crystal changes, and realizes the measurement to voltage by the change detecting the polarization state of the light wave that electro-optic crystal exports.
Application number is the optical voltage sensor of 20098011855.3, disclose a kind of optical voltage sensor based on Pockels electrooptical effect, analyzer is adopted to carry out signal receiving, for measuring single-phase voltage, as shown in Figure 2, need to adopt simultaneously three independently optical voltage transformer could realize measuring while three-phase voltage; Application number 200810238946.6 optical voltage transformer, disclose a kind of optical voltage sensor based on Pockels electrooptical effect, signal receiving is carried out by interfere measurement technique, for measuring single-phase voltage, need to adopt simultaneously three independently optical voltage sensor could realize measuring while three-phase voltage, and need to adopt complicated closed-loop control modulation-demodulation technique.
In order to ensure transmission of electricity safely, improve power transmission efficiency and realize transmitted power metering, power transmission and transformation electrical network requires the value of simultaneously monitoring three-phase voltage usually.By monitoring the value of three-phase voltage simultaneously, the change in voltage that Timeliness coverage fault causes also is safeguarded, the imbalance of Timeliness coverage three-phase voltage also regulates; Measure in conjunction with three-phase current, realize transmitted power metering, realize the monitoring of the grid power factor, load quality factor and improve power transmission efficiency by FEEDBACK CONTROL.Meanwhile, in order to save installing space, reduce costs and be convenient to safeguard, three phase optical voltage sensor is usually integrated in same insulation system and applies.
At present the optical voltage sensor of open report is all measure for single-phase in three-phase voltage, follow-uply again carry out signal transacting, this scheme needs employing three independently light source, there is the shortcoming that consistance between three optical voltage sensors is poor, be unfavorable for realizing the integrated of three optical voltage sensors simultaneously.
Summary of the invention
The technical matters that the present invention solves is: overcome the deficiencies in the prior art, a kind of optical voltage sensor of three-phase common light source is provided, the measurement consistance that light source center wavelength and changed power cause can be reduced worsen, be easy to the integrated of the optical voltage sensor realizing measuring three-phase voltage simultaneously.
Technical solution of the present invention is: a kind of optical voltage sensor of three-phase common light source, comprise light source, light source drive and temperature control circuit, optical branching device, optical fiber collimator, the polarizer, quarter wave plate, electro-optic crystal, polarization beam apparatus, photodetector and amplifying circuit, Signal acquiring and processing circuit; An optical branching device is have employed after light source; The light sent from a light source be divided into after optical branching device power ratio close to 1: 1: 1 three beams, three beams exports light and after three of correspondence optical fiber collimators expand, inputs three corresponding polarizers respectively, and the linearly polarized light that three polarizers export converts circularly polarized light to through three corresponding quarter wave plates; Three beams circularly polarized light inputs three blocks of corresponding electro-optic crystals, and three-phase voltage to be measured acts on three blocks of electro-optic crystals respectively, because Pockles electrooptical effect circularly polarized light is changed by polarization state during electro-optic crystal; The output light of three blocks of electro-optic crystals divides through three corresponding polarization beam apparatus the linearly polarized light be orthogonal, and the change of the polarization state of light wave is converted to the light intensity change of orthogonal linearly polarized light; Six bunch polarized lights are respectively through six corresponding optical fiber collimator coupled into optical fibres, and six photodetectors and amplifying circuit convert the light intensity of six of correspondence bundle light to voltage signal respectively; Signal acquiring and processing circuit converts six road voltage signals to digital signal, carries out zero correction to the six road voltage signals gathered, and every road voltage signal deducts the magnitude of voltage of correspondence during unglazed input respectively; Magnitude of voltage after two zero corrections that every phase optical voltage sensor is corresponding carries out division arithmetic, obtains three voltage ratios; Carry out zero voltage correction to be measured to three voltage ratios, the voltage ratio of correspondence during Relative Zero voltage to be measured is normalized, and exports three normalized voltage ratios; The value of three-phase voltage to be measured is calculated according to three normalized voltage ratios.
Described Signal acquiring and processing circuit carries out zero correction to the six road voltage signals gathered, and every road voltage signal deducts the magnitude of voltage of correspondence during unglazed input respectively; Magnitude of voltage after two zero corrections that every phase optical voltage sensor is corresponding carries out division arithmetic, obtains three voltage ratios; Carry out zero voltage correction to be measured to three voltage ratios, the voltage ratio of correspondence during Relative Zero voltage to be measured is normalized, and exports three normalized voltage ratios; The value of three-phase voltage to be measured is calculated according to three normalized voltage ratios.
Described light source adopts super-radiance light emitting diode SLD, limit light emitting diode ELED or broadband Er-Doped superfluorescent fiber source SFS.
Described optical branching device is 3 × 3 fiber couplers or is made up of two 2 × 2 fiber couplers or 1 × 2 fiber coupler.
The present invention's advantage is compared with prior art:
(1) optical voltage sensor of three-phase common light source of the present invention, the sensitivity of three phase optical voltage sensor and the non-linear impact being subject to light source identical, be conducive to unified Modeling and compensation, thus improve the measurement consistance of three phase optical voltage sensor.
(2) compared with employing three independently optical voltage sensor, the optical voltage sensor of three-phase common light source of the present invention is more convenient for integrated, thus is more applicable to the requirement that electrical network is measured three-phase voltage simultaneously and three phase optical voltage sensor integrated installation uses.
(3) Signal acquiring and processing circuit of the present invention is by carrying out zero correction to the photodetection voltage signal gathered, zero voltage correction to be measured is carried out to voltage ratio, the parameter that compensate for three phase optical voltage sensor is inconsistent, thus improves the measurement consistance of three phase optical voltage sensor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the optical voltage sensor based on Pockels electrooptical effect;
Fig. 2 is the structural drawing of the single-phase optical voltage sensor of prior art;
Fig. 3 is the structural drawing of the optical voltage sensor of three-phase common light source of the present invention;
Fig. 4 is the schematic diagram of Signal acquiring and processing circuit of the present invention;
Description of reference numerals:
1... light source,
2... light source drives and temperature control,
3... optical branching device,
4a, 4b... transmission cable,
5...A phase optical voltage sensor,
6...B phase optical voltage sensor,
7...C phase optical voltage sensor,
51a, 51b, 51c, 61a, 61b, 61c, 71a, 71b, 71c... optical fiber collimator,
52,62, the 72... polarizer,
53,63,73...1/4 wave plate,
54,64,74... electro-optic crystal,
55,65,75... polarization beam apparatus,
8a, 8b, 8c, 8d, 8e, 8f... photodetector and amplifying circuit,
9... Signal acquiring and processing circuit.
Embodiment
As shown in Figure 3, the optical voltage sensor of three-phase common light source disclosed by the invention is made up of voltage perception light path, light source and acquisition of signal treatment circuit; Voltage perception light path is placed in voltage environment to be measured, converts voltage signal to be measured to light signal; Light source and acquisition of signal treatment circuit are placed in pulpit, launch, photosignal detects and voltage resolves output for light source; Connected by transmission cable between voltage perception light path and light source and acquisition of signal treatment circuit, there are excellent insulating property.Voltage perception light path comprises optical fiber collimator, the polarizer, quarter wave plate, electro-optic crystal and polarization beam apparatus; Light source and acquisition of signal treatment circuit comprise light source, light source drives and temperature control, photodetector and amplifying circuit, Signal acquiring and processing circuit.
Light source driving and temperature control circuit 2 control the light of light source 1 stable output, the light that light source 1 sends through optical branching device 3 be divided into power ratio close to 1: 1: 1 three beams, three beams export light respectively through transmission cable 4a input optical fibre collimating apparatus 51a, optical fiber collimator 61a and optical fiber collimator 71a.Optical fiber collimator 51a export expand after light beam input the polarizer 52, the polarizer 52 export linearly polarized light convert circularly polarized light to through quarter wave plate 53, then input electro-optic crystal 54; Voltage V to be measured
aact on electro-optic crystal 54, because Pockles electrooptical effect circularly polarized light is changed by polarization state during electro-optic crystal 54, the output light of electro-optic crystal 54 is divided the two bunch polarized lights be orthogonal by polarization beam apparatus 55, the change of the polarization state of light wave is converted to the light intensity change of two orthogonal bunch polarized lights; The two-beam that polarization beam apparatus 54 exports is respectively through optical fiber collimator 51b, optical fiber collimator 51c coupled into optical fibres, input photodetector and amplifying circuit 8a, photodetector and amplifying circuit 8b through transmission cable 4b respectively, export the two-way voltage signal corresponding with the light intensity of two-beam; Signal acquiring and processing circuit 9 converts two-way voltage signal to digital signal and carries out corresponding signal transacting, exports voltage V to be measured
avalue.Optical fiber collimator 61a export expand after light beam input the polarizer 62, the polarizer 62 export linearly polarized light convert circularly polarized light to through quarter wave plate 63, then input electro-optic crystal 64; Voltage V to be measured
bact on electro-optic crystal 64, because Pockles electrooptical effect circularly polarized light is changed by polarization state during electro-optic crystal 64, the output light of electro-optic crystal 64 is divided the two bunch polarized lights be orthogonal by polarization beam apparatus 65, the change of the polarization state of light wave is converted to the light intensity change of two orthogonal bunch polarized lights; The two-beam that polarization beam apparatus 64 exports is respectively through optical fiber collimator 61b, optical fiber collimator 61c coupled into optical fibres, input photodetector and amplifying circuit 8b, photodetector and amplifying circuit 8c through transmission cable 4b respectively, export the two-way voltage signal corresponding with the light intensity of two-beam; Signal acquiring and processing circuit 9 converts two-way voltage signal to digital signal and carries out corresponding signal transacting, exports voltage V to be measured
bvalue.Optical fiber collimator 71a export expand after light beam input the polarizer 72, the polarizer 72 export linearly polarized light convert circularly polarized light to through quarter wave plate 73, then input electro-optic crystal 74; Voltage V to be measured
cact on electro-optic crystal 74, because Pockles effect circularly polarized light is changed by polarization state during electro-optic crystal 74, the output light of electro-optic crystal 74 is divided the two bunch polarized lights be orthogonal by polarization beam apparatus 75, the change of the polarization state of light wave is converted to the light intensity change of two orthogonal bunch polarized lights; The two-beam that polarization beam apparatus 75 exports is respectively through optical fiber collimator 71b, optical fiber collimator 71c coupled into optical fibres, input photodetector and amplifying circuit 8e, photodetector and amplifying circuit 8f through transmission cable 4b respectively, export the two-way voltage signal corresponding with the light intensity of two-beam; Signal acquiring and processing circuit 9 converts two-way voltage signal to digital signal and carries out corresponding signal transacting, exports voltage V to be measured
cvalue, thus realize to while three-phase voltage to be measured measure.
As shown in Figure 4, Signal acquiring and processing circuit 9 is first by voltage V that photodetector and amplifying circuit 8a export
8a, the voltage V that exports of photodetector and amplifying circuit 8b
8b, the voltage V that exports of photodetector and amplifying circuit 8c
8c, the voltage V that exports of photodetector and amplifying circuit 8d
8d, the voltage V that exports of photodetector and amplifying circuit 8e
8e, the voltage V that exports of photodetector and amplifying circuit 8f
8fconvert digital quantity to; Zero correction is carried out, V to the six road voltage signals gathered
8adeduct magnitude of voltage V during unglazed input
8a0, V
8bdeduct magnitude of voltage V during unglazed input
8b0, V
8cdeduct magnitude of voltage V during unglazed input
8c0, V
8ddeduct magnitude of voltage V during unglazed input
8d0, V
8ededuct magnitude of voltage V during unglazed input
8e0, V
8fdeduct magnitude of voltage V during unglazed input
8f0; Division arithmetic is carried out to the voltage after zero correction, obtains three voltage ratios
Zero voltage correction to be measured is carried out to three voltage ratios, voltage ratio K during Relative Zero voltage to be measured
a0, K
b0, K
c0be normalized, export three normalized voltage ratios
with voltage V to be measured
abetween corresponding relation be
wherein α
a, K
a,
for the parameter of the A phase optical voltage sensor of demarcation, thus calculate voltage V to be measured
a;
with voltage V to be measured
bbetween corresponding relation be
wherein α
b, K
b,
for the parameter of the B phase optical voltage sensor of demarcation, thus calculate voltage V to be measured
b;
with voltage V to be measured
cbetween corresponding relation be
wherein α
c, K
c,
for the parameter of the C phase optical voltage sensor of demarcation, thus calculate voltage V to be measured
c.
The present invention can reduce three-phase voltage that light source center wavelength and changed power cause and measure consistance and worsen, and is easy to realize the integrated of three phase optical voltage sensor simultaneously, is particularly suitable for the requirement that electrical network is measured three-phase voltage simultaneously.
Non-elaborated part of the present invention belongs to techniques well known.
Claims (3)
1. the optical voltage sensor of a three-phase common light source, comprise light source, light source drive and temperature control circuit, optical branching device, optical fiber collimator, the polarizer, quarter wave plate, electro-optic crystal, polarization beam apparatus, photodetector and amplifying circuit, Signal acquiring and processing circuit, it is characterized in that: the optical voltage sensor of described three-phase common light source shares a light source and driving thereof and temperature control circuit, have employed an optical branching device after light source, the light sent from a light source is divided into three beams through an optical branching device, the polarizer that input three is corresponding after three optical fiber collimators of correspondence expand, the linearly polarized light that three polarizers export converts circularly polarized light to through three corresponding quarter wave plates, three beams circularly polarized light inputs three blocks of corresponding electro-optic crystals, the output light of three blocks of electro-optic crystals divides through three corresponding polarization beam apparatus the linearly polarized light be orthogonal, six bunch polarized lights are respectively through six corresponding optical fiber collimator coupled into optical fibres, six photodetectors and amplifying circuit convert the light intensity of six bunch polarized lights of correspondence to voltage signal respectively, Signal acquiring and processing circuit converts six road voltage signals to digital signal and carries out corresponding signal transacting, export the value of three-phase voltage to be measured,
Described Signal acquiring and processing circuit carries out zero correction to the six road voltage signals gathered, and every road voltage signal deducts the magnitude of voltage of correspondence during unglazed input respectively; Magnitude of voltage after two zero corrections that every phase optical voltage sensor is corresponding carries out division arithmetic, obtains three voltage ratios; Carry out zero voltage correction to be measured to three voltage ratios, the voltage ratio of correspondence during Relative Zero voltage to be measured is normalized, and exports three normalized voltage ratios; The value of three-phase voltage to be measured is calculated according to three normalized voltage ratios.
2. the optical voltage sensor of a kind of three-phase common light source as requested described in right 1, is characterized in that: described light source adopts super-radiance light emitting diode SLD, limit light emitting diode ELED or broadband Er-Doped superfluorescent fiber source SFS.
3. the optical voltage sensor of a kind of three-phase common light source as requested described in right 1, is characterized in that: described optical branching device is 3 × 3 fiber couplers, or is made up of two 2 × 2 fiber couplers and 1 × 2 fiber coupler.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110418222.1A CN103163351B (en) | 2011-12-13 | 2011-12-13 | A kind of optical voltage sensor of three-phase common light source |
| PCT/CN2012/086585 WO2013087013A1 (en) | 2011-12-13 | 2012-12-13 | Optical voltage sensor for three-phase common light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110418222.1A CN103163351B (en) | 2011-12-13 | 2011-12-13 | A kind of optical voltage sensor of three-phase common light source |
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| CN103163351A CN103163351A (en) | 2013-06-19 |
| CN103163351B true CN103163351B (en) | 2015-08-05 |
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| WO (1) | WO2013087013A1 (en) |
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| CN103424635A (en) * | 2013-08-05 | 2013-12-04 | 国家电网公司 | Electric field strength transducer capable of working in high-electric-field environments |
| CN103954827A (en) * | 2014-04-03 | 2014-07-30 | 易能乾元（北京）电力科技有限公司 | Optical current sensor |
| CN104897368B (en) * | 2015-05-05 | 2018-08-07 | 上海大学 | Polarization maintaining optical fibre extinction ratio real-time test device |
| CN106706991B (en) * | 2016-11-15 | 2024-06-25 | 国家电网有限公司 | Optical current transformer |
| CN113238086A (en) * | 2021-05-11 | 2021-08-10 | 国网山东省电力公司泰安供电公司 | GIS transient shell voltage on-line monitoring system based on optical voltage sensor |
| CN113189386A (en) * | 2021-05-11 | 2021-07-30 | 国网山东省电力公司泰安供电公司 | GIS rapid transient overvoltage optical online monitoring system |
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| CN103163351A (en) | 2013-06-19 |
| WO2013087013A1 (en) | 2013-06-20 |
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