CN103344812A - Magneto-optic current sensor with temperature compensation - Google Patents
Magneto-optic current sensor with temperature compensation Download PDFInfo
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- CN103344812A CN103344812A CN2013102790772A CN201310279077A CN103344812A CN 103344812 A CN103344812 A CN 103344812A CN 2013102790772 A CN2013102790772 A CN 2013102790772A CN 201310279077 A CN201310279077 A CN 201310279077A CN 103344812 A CN103344812 A CN 103344812A
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- 239000013307 optical fiber Substances 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 20
- 230000010287 polarization Effects 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000001228 spectrum Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 230000003595 spectral effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 9
- 239000000382 optic material Substances 0.000 abstract description 4
- 230000005291 magnetic effect Effects 0.000 description 11
- 239000013078 crystal Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000004020 conductor Substances 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention relates to a magneto-optic current sensor with temperature compensation. The magneto-optic current sensor with temperature compensation comprises a magneto-optic current sensor system and a data processing system. The magneto-optic current sensor system is composed of a light source, an optical fiber isolator, an optical fiber beam splitter, an optical fiber grating and a magneto-optic current sensing head. The magneto-optic current sensing head is composed of a polarizer, magneto-optic materials, an analyzer and an optical fiber collimator. The light source is arranged at the forefront end, and the optical fiber isolator, the optical fiber beam splitter, the optical fiber grating, the polarizer, the magneto-optic materials, the analyzer and the optical fiber collimator are sequentially arranged in the back. The data processing system is composed of a temperature signal detector, a current signal detector and a demodulator. The input end of the temperature signal detector is connected with the output end of the optical fiber beam splitter, the current signal detector is connected with the output end of the optical fiber collimator, and the temperature signal detector and the current signal detector are respectively and electrically connected with the demodulator. The magneto-optic current sensor with temperature compensation is high in measurement accuracy.
Description
Technical field
The present invention relates to a kind of magneto-optic current transducer of temperature compensation, belong to the Electrical Measurement Technology field.
Background technology
In electric system, along with the growth requirement with intelligent grid of improving constantly of line voltage, particularly important to the isoparametric monitoring of voltage, electric current, power, temperature of power transmission and transformation line.Traditional electromagnetic sensor more and more can not meet the demands because of poor insulativity, complex structure, reason such as with high costs.For this reason, full light high-tension current sensor becomes one of focus of research, and many manufacturers both domestic and external have all released product separately.Magneto-optic current transducer has numerous advantages such as safe, that precision is high, measurement range is wide compared to the conventional current sensor, but do not promoted fully in actual applications so far, reason is present optical current sensor, be subjected to all multifactor influences such as temperature, time, position, external magnetic field, cause sensor accuracy to be difficult to meet the demands, and the measurement of big electric current, super-large current is often carried out under the ten minutes rugged environment, this just causes temperature particularly outstanding to the influence of sensor, has a strong impact on precision and the accuracy of current measurement.
The principle of magneto-optic current transducer: when light beam passed through magneto-optical crystal, owing to Faraday effect, the polarization state of light field can rotate under the influence in magnetic field.When the magnetic field that electric current produces was parallel to light beam, the angle of rotation was:
Wherein V is the Verdet constant of magneto-optical crystal, and B is the magnetic induction density that electric current produces magnetic field, and L is the length of magneto-optical crystal.
Light beam is obtained linearly polarized light by the polarizer; By magneto-optical crystal, under the influence in magnetic field, the light beam polarization direction rotates again; Detect the polarization direction rotation angle with analyzer, can measure the size in magnetic field.Because the magnetic effect of electric current can produce magnetic field, calculate corresponding size of current by the big I of measuring magnetic field.
Because the Verdet constant of magneto-optical crystal size is inversely proportional to temperature, so when variation of ambient temperature was big, measurement result had certain error.
Application number provides a kind of fibre optic current sensor method of intrinsic temperature compensation for the Chinese patent of cn201010508343.0.This method utilizes the magnetic field effect down, and propagate in optical fiber with left-handed light wave on the right side that Faraday effect causes has different phase velocities, calculates corresponding size of current by the size of measuring magnetic field.The method of intrinsic temperature compensation has been utilized the temperature dependency of the optical fiber delayer that produces positive polarized light.In order to carry out temperature compensation, under different temperatures, this delay is set to the appropriate value that differs a non-zero amount with conventional 90 ° of delays, offsets Verdet constant and varies with temperature the influence that causes.
The method of this intrinsic compensation has been eliminated the needs for additional temperature sensor, but the suitable retardation of optical fiber delayer of carrying out temperature compensation is very important, need carry out meticulous adjusting when the manufacturing delay device, and manufacture difficulty is bigger.
Summary of the invention
The objective of the invention is to overcome the defective that prior art exists, the magneto-optic current transducer of the high temperature compensation of a kind of measuring accuracy is provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of magneto-optic current transducer of temperature compensation, comprise magneto-optic current transducer system and data handling system, described magneto-optic current transducer system is by light source, the fibre optic isolater that the output light of light source is had unidirectional permeability, fiber optic splitter, be used for reflection source a part of temperature correlation narrow-band spectrum and fiber grating and the Magnetooptic current sensing head of other spectrum transmittings constitute, described Magnetooptic current sensing head is by the polarizer, magneto-optic memory technique, analyzer and optical fiber collimator constitute, described light source is positioned at foremost, be aligned in sequence with fibre optic isolater thereafter, fiber optic splitter, fiber grating, the polarizer, magneto-optic memory technique, analyzer and optical fiber collimator, described data handling system is by the temperature signal detector, current signal detector and detuner constitute, the input end of described temperature signal detector is connected with the output terminal of fiber optic splitter, the input end of described current signal detector is connected with the tail optical fiber output terminal of optical fiber collimator, described temperature signal detector, the output terminal of current signal detector is electrically connected with the input end of detuner respectively.
The Output optical power of described light source, wavelength coverage are stablized and polarization irrelevant.
Described fiber optic splitter is 1 * 2 fiber optic splitter, and its splitting ratio is 1:1.
Described magneto-optic memory technique has big Verdet constant.
The transmission polarization direction of described analyzer and polarizer starting of oscillation angular separation are 45 °.
The centre wavelength of fiber grating correspondence is in the spectral range of light source.
Beneficial effect: the magneto-optic current transducer of this temperature compensation, the convenient and strong interference immunity of linked network; Measure temperature and current information simultaneously, utilize the fiber grating measures ambient temperature, compensation is done the temperature correction to current measurement result, has strengthened the temperature stability of magneto-optic current transducer, has improved the degree of accuracy of magneto-optic current transducer under severe temperature environment.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural representation of the preferred embodiments of the present invention.
Embodiment
The magneto-optic current transducer of a kind of temperature compensation as shown in Figure 1, comprise magneto-optic current transducer system 1 and data handling system 2, described magneto-optic current transducer system 1 by light source 11, to the output light of light source 11 have unidirectional permeability fibre optic isolater 12, fiber optic splitter 13, be used for reflection source 11 a part of temperature correlation narrow-band spectrum and fiber grating 14 and the Magnetooptic current sensing head 15 of other spectrum transmittings constitute.Described Magnetooptic current sensing head 15 is made of the polarizer 151, magneto-optic memory technique 152, analyzer 153 and optical fiber collimator 154.Described light source 11 is positioned at foremost, be aligned in sequence with fibre optic isolater 12 thereafter, fiber optic splitter 13, fiber grating 14, the polarizer 151, magneto-optic memory technique 152, analyzer 153 and optical fiber collimator 154, described data handling system 2 is by temperature signal detector 21, current signal detector 22 and detuner 23 constitute, the input end of described temperature signal detector 21 is connected with the output terminals A of fiber optic splitter 13, the input end of described current signal detector 22 is connected with the tail optical fiber output terminal of optical fiber collimator 154, described temperature signal detector 21, the output terminal of current signal detector 22 is electrically connected with the input end of detuner 23 respectively.
The Output optical power of described light source 11, wavelength coverage are stablized and polarization irrelevant.Described fiber optic splitter 13 is 1 * 2 fiber optic splitter, and its splitting ratio is 1:1.Described magneto-optic memory technique 152 has big Verdet constant.The transmission polarization direction of described analyzer 153 and the polarizer 151 starting of oscillation angular separations are 45 °.The centre wavelength of fiber grating 14 correspondences is in the spectral range of light source 11, and when temperature variation, catoptrical wavelength is moved.
Described data handling system 2 is made up of two parts: optical signal detector: measure the output light field intensity of magneto-optic current transducer system 1 and the wavelength information of fiber grating 14 reflections; Detuner 23: the output of receiving optical signals detector, demodulate electric current and temperature information, and according to the influence of the ambient temperature compensation temperature variation that calculates to the electric current demodulation, provide the size of current after the temperature compensation.
Make magneto-optic memory technique 152 optical directions vertical with direction of current near Magnetooptic current sensing head 15 placed current carrying conductor 3.Light field becomes linearly polarized light through behind the polarizer 151; When continuing to propagate through magneto-optic memory technique 152, because the Faraday effect polarization direction rotates, the anglec of rotation namely with the polarizer 151 starting of oscillation angular separations is:
μ wherein
0Be permeability of vacuum, V is the magneto-optic memory technique Verdet constant, and L is the distance that light is propagated in magneto-optic memory technique, and r is that magneto-optic memory technique is to the distance of current carrying conductor 3; Light field continues to propagate through analyzer 153 back output intensities
P wherein
0Therefore be the output intensity of light source 11, can be calculated the size of light field faraday rotation angle θ by output intensity, when θ hour is approximately
At this moment, the relational expression of size of current and output intensity is in the current carrying conductor 3
Relational expression can be found out thus, loads identical electric current in lead, and Verdet constant V is more big, and output light field intensity change amount is more big.That is to say that the magneto-optic memory technique of high Verdet constant can improve the sensitivity of sensing head.Yet common high Verdet constant magneto-optic memory technique such as yig crystal MR3 on the market, MR4 magneto-optic glass equitemperature stability are all relatively poor, therefore, need measured value is carried out temperature compensation under different temperature.Use fiber grating 14 to be integrated in the magneto-optic current transducer system 1 in the present invention, when measuring the residing environment temperature of sensing head, compensates constitutes a kind of magneto-optic current transducer of temperature compensating type to the influence of magneto-optic current transducer.
In periodic fiber grating, according to coupled mode theory, catoptrical centre wavelength is by the Bragg conditional decision:
λ
B＝2n
eff∧ (3)
λ in the formula
BBe the centre wavelength of fiber grating, n
EffBe the effective refractive index of fiber core, ∧ is the grating cycle.Because thermal expansion effects and thermo-optic effect that temperature causes can change ∧ and n
EffThe strain meeting changes grid cycle, and elasto-optical effect changes n
Eff, so temperature and strain all can change catoptrical centre wavelength.
When temperature and strain changed, the centre wavelength of fiber grating was
Be effective elasto-optical coefficient of optical fiber in the formula, ε is axial strain, and ɑ is the thermal expansivity of fiber optic materials, is the thermo-optical coeffecient of optical fiber, all is the constant relevant with fiber optic materials, and Δ T is the variation of temperature amount.Temperature variation is relevant with the change of optical grating reflection centre wavelength as can be seen.
The present invention is scribed at fiber grating 14 on the Transmission Fibers of Magnetooptic current sensing head 15, and encapsulation is fixed near the Magnetooptic current sensing head 15, and when temperature variation, fiber grating 14 catoptrical centre wavelengths can change.At first output intensity and the measurement size of current relation to Magnetooptic current sensing head 15 calibrated under different temperature, in actual the use according to the change calculations environment temperature of the output center wavelength of light of grating temperature bucking-out system, measurement result with Magnetooptic current sensing head 15 multiply by corresponding temperature correction factor then, can obtain the exact current value.
Should be appreciated that specific embodiment described above only is used for explaining the present invention, and be not used in restriction the present invention.The apparent variation of being extended out by spirit of the present invention or change still are among protection scope of the present invention.
Claims (6)
1. the magneto-optic current transducer of a temperature compensation, it is characterized in that: comprise magneto-optic current transducer system (1) and data handling system (2), described magneto-optic current transducer system (1) is by light source (11), the fibre optic isolater (12) that the output light of light source (11) is had unidirectional permeability, fiber optic splitter (13), be used for the narrow-band spectrum of a part of temperature correlation of reflection source (11) and fiber grating (14) and Magnetooptic current sensing head (15) formation of other spectrum transmittings, described Magnetooptic current sensing head (15) is by the polarizer (151), magneto-optic memory technique (152), analyzer (153) and optical fiber collimator (154) constitute, described light source (11) is positioned at foremost, be aligned in sequence with fibre optic isolater (12) thereafter, fiber optic splitter (13), fiber grating (14), the polarizer (151), magneto-optic memory technique (152), analyzer (153) and optical fiber collimator (154), described data handling system (2) is by temperature signal detector (21), current signal detector (22) and detuner (23) constitute, the input end of described temperature signal detector (21) is connected with the output terminal (A) of fiber optic splitter (13), the input end of described current signal detector (22) is connected with the tail optical fiber output terminal of optical fiber collimator (154), described temperature signal detector (21), the output terminal of current signal detector (22) is electrically connected with the input end of detuner (23) respectively.
2. the magneto-optic current transducer of temperature compensation according to claim 1 is characterized in that: the Output optical power of described light source (11), wavelength coverage is stable and polarization irrelevant.
3. the magneto-optic current transducer of temperature compensation according to claim 1, it is characterized in that: described fiber optic splitter (13) is 1 * 2 fiber optic splitter, its splitting ratio is 1:1.
4. the magneto-optic current transducer of temperature compensation according to claim 1 is characterized in that: described magneto-optic memory technique (152) has big Verdet constant.
5. the magneto-optic current transducer of temperature compensation according to claim 1, it is characterized in that: the transmission polarization direction of described analyzer (153) and the polarizer (151) starting of oscillation angular separation are 45 °.
6. the magneto-optic current transducer of temperature compensation according to claim 1 is characterized in that: the centre wavelength that fiber grating (14) is corresponding is in the spectral range of light source (11).
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| CN2013102790772A CN103344812A (en) | 2013-07-04 | 2013-07-04 | Magneto-optic current sensor with temperature compensation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995166A (en) * | 2014-04-29 | 2014-08-20 | 国家电网公司 | Temperature-compensated optical current measurement module and temperature-compensated optical current transformer |
| CN105403763A (en) * | 2015-11-02 | 2016-03-16 | 国家电网公司 | Verdet constant temperature compensation method and device of optical-fiber current sensor |
| CN106291039A (en) * | 2016-07-26 | 2017-01-04 | 胡朝年 | Magneto-opitcal current transducer |
| CN110824227A (en) * | 2019-10-24 | 2020-02-21 | 国网重庆市电力公司江津供电分公司 | Novel 10kV overhead line zero-sequence current measurement system and method and performance test platform |
| CN113124935A (en) * | 2021-04-21 | 2021-07-16 | 华北电力大学 | Leakage flux temperature composite sensor of oil-immersed transformer and measuring method |
Citations (5)
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| TW234742B (en) * | 1994-03-28 | 1994-11-21 | Ind Tech Res Inst | Optical fiber current sensor with temperature compensation |
| US5416860A (en) * | 1994-08-29 | 1995-05-16 | Industrial Technology Research Institute | Method and apparatus for optically measuring electric current and/or magnetic field with temperature compensation |
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| WO2011025573A1 (en) * | 2009-08-27 | 2011-03-03 | General Electric Company | Fiber optic current sensing system with temperature compensation |
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2013
- 2013-07-04 CN CN2013102790772A patent/CN103344812A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW234742B (en) * | 1994-03-28 | 1994-11-21 | Ind Tech Res Inst | Optical fiber current sensor with temperature compensation |
| US5416860A (en) * | 1994-08-29 | 1995-05-16 | Industrial Technology Research Institute | Method and apparatus for optically measuring electric current and/or magnetic field with temperature compensation |
| CN1183561A (en) * | 1996-11-21 | 1998-06-03 | 华中理工大学 | Integrated Compensation Fiber Optic Current Sensor |
| CN101339207A (en) * | 2008-08-28 | 2009-01-07 | 华北电力大学（保定） | A Method of Improving the Stability of Optical Current Sensor |
| WO2011025573A1 (en) * | 2009-08-27 | 2011-03-03 | General Electric Company | Fiber optic current sensing system with temperature compensation |
Non-Patent Citations (1)
| Title |
|---|
| 李竞攀: "光学电流互感器温度补偿新方法", 《中国优秀硕士学位论文全文数据库（电子期刊）》, 30 November 2012 (2012-11-30) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995166A (en) * | 2014-04-29 | 2014-08-20 | 国家电网公司 | Temperature-compensated optical current measurement module and temperature-compensated optical current transformer |
| CN105403763A (en) * | 2015-11-02 | 2016-03-16 | 国家电网公司 | Verdet constant temperature compensation method and device of optical-fiber current sensor |
| CN106291039A (en) * | 2016-07-26 | 2017-01-04 | 胡朝年 | Magneto-opitcal current transducer |
| CN110824227A (en) * | 2019-10-24 | 2020-02-21 | 国网重庆市电力公司江津供电分公司 | Novel 10kV overhead line zero-sequence current measurement system and method and performance test platform |
| CN113124935A (en) * | 2021-04-21 | 2021-07-16 | 华北电力大学 | Leakage flux temperature composite sensor of oil-immersed transformer and measuring method |
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