CN205786792U - A kind of all-fiber current transformator based on optical fiber temperature sensor - Google Patents
A kind of all-fiber current transformator based on optical fiber temperature sensor Download PDFInfo
- Publication number
- CN205786792U CN205786792U CN201620527036.XU CN201620527036U CN205786792U CN 205786792 U CN205786792 U CN 205786792U CN 201620527036 U CN201620527036 U CN 201620527036U CN 205786792 U CN205786792 U CN 205786792U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- fiber
- temperature sensor
- temperature
- current mutual
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
This utility model discloses a kind of all-fiber current transformator based on optical fiber temperature sensor, including optical fiber current mutual inductor, optical fiber temperature sensor；Described optical fiber temperature sensor is integrated in same housing with the sensing head of optical fiber current mutual inductor, the temperature at sensing head of optical fiber current mutual inductor is measured by optical fiber temperature sensor, and according to the temperature information measured, in conjunction with temperature compensation algorithm, eliminate the variation of ambient temperature impact on optical fiber current mutual inductor accuracy of measurement.Optical fiber temperature sensor and optical fiber current mutual inductor share a set of wide spectrum light source, depolarizer, 1 × 3 beam splitter and signal processor, it is possible to reduce system cost, improve the integration capability of system.Optical fiber temperature sensor shares a polarization maintaining optical fibre transmission cable with the analogue signal transmission of optical fiber current mutual inductor, it is possible to reduces product laying difficulty at the scene, reduces system cost, improves the integrated and protective capacities of system.
Description
Technical field
This utility model relates to a kind of all-fiber current transformator, particularly relates to a kind of based on polarization maintaining optical fibre temperature biography
The all-fiber current transformator of sensor, belongs to fiber optic sensing applications field.
Background technology
For a long time, electromagnetic transformer plays the key player that Operation of Electric Systems monitors always.Power transformation
Measure in standing and monitor and protection controls to rely on it to obtain measurement, measure, protect required electric current, voltage etc.
Information.Along with the raising of line voltage and intellectuality once, the development of secondary device, traditional electromagnetic type is mutual
Sensor the most gradually exposes the shortcoming of himself, as weak in electric insulation, volume is heavy, dynamic range is little,
There is core sataration, ferro-resonance over-voltage etc..
Along with the deep development of Substation Automation System, occur in that once, secondary device interpenetrates, melt
The Novel intelligent primary equipment closed.Traditional electromagnetic transformer is replaced, with optical fiber with electronic mutual inductor
Transmission digital signal, on the spot integrated relay protection, observing and controlling function, tie with chopper or fully closed combined electric unit
Close, form New Generation of Intelligent primary equipment, electric substation automation system can be strengthened and monitor in real time and control
Reliability, motility, reduce and build and run investment, maintain easily.
Electronic mutual inductor includes active electronic type instrument transformer and active electronic transformer.Full optical-fiber current is mutual
Sensor belongs to active electronic type instrument transformer, there are not electronic devices and components at high-pressure side, it is not necessary to power supply, insulation knot
Structure is simple, reliable, and capacity of resisting disturbance is strong, without magnetic saturation and ferromagnetic resonance, has volume little, dynamic
Measurement scope is big, response band width, can the advantage such as test cross direct current signal, become present stage power industry electric current
The study hotspot of signals collecting scheme.
Ambient temperature is the principal element affecting all-fiber current transformator accuracy of measurement.Full optical-fiber current mutual inductance
The signal gathering unit of device is typically disposed in the outdoor cabinet of Substation control room screen cabinet or band temperature control, operating temperature
More stable.A mainly sensing head part influenced by environmental temperature, including λ/4 wave plate, biography
Photosensitive fibre and reflecting mirror.At present, reduce ambient temperature and introduce resourcefulness employing algorithm compensation or the optics of error
The mutual compensation technique of device, but owing to device and the parameter of all-fiber current transformator temperature influence are more, no
Being completely eliminated of temperature error can be realized.Optical passive temperature sensor is used to realize all-fiber current transformator
Compensation schemes, it is possible to according to the actual temperature characteristic of all-fiber current transformator, eliminate ambient temperature
The change impact on all-fiber current transformator accuracy of measurement.
Optic temperature sensor ripe in the market mainly have fluorescence type, fiber Bragg grating type,
Raman/Brillouin scattering formulas etc. are several, but how much there is temperature-measuring range narrow (100 degrees centigrade), pass
Defeated complicated apart from short (generally less than 20m), demodulation principle, the problem such as expensive.
The reflective optical fiber temperature sensor of temperature birefringence effect based on polarization maintaining optical fibre design has height
Precision, low cost, having the feature of good reciprocity, transmission range is unrestricted, uses special material
And packaging technology, the remote temperature measurement demand of power industry different field can be met.Use polarization maintaining optical fibre
Temperature sensor realizes the temperature-compensating of optical fiber current mutual inductor, by optics, transmission cable and signal
Processor integrated with share, it is possible to increase the integration capability of system and reliability, reduce product field wiring
And the difficulty installed, reduce system cost.
Utility model content
This utility model provides a kind of full optical-fiber current based on optical fiber temperature sensor for the problems referred to above
Transformer, designs the Integrated Solution of a kind of optical fiber temperature sensor and all-fiber current transformator, it is achieved
The temperature survey of sensing head part of all-fiber current transformator, and then realize all-fiber current transformator
Temperature-compensating.
This utility model adopts the following technical scheme that
The light that wide spectrum light source sends, after bonder and the polarizer, forms line polarized light.Line polarized light is with 45 °
After angle enters phase-modulator, it is divided into two orthogonal bunch polarisations respectively along fast, the slow axis transmission of polarization maintaining optical fibre.
Described phase-modulator uses straight wave guide type phase-modulator, and signal processor adds square wave to phase-modulator
And staircase waveform phase modulated signal, it is achieved closed loop control, it is possible to solve cosine sensitivity and the directivity of system
Problem, improves the linearity and the dynamic range of systematic survey.Two bunch polarisations are after the wave plate of λ/4, respectively
Become left-handed and dextrorotation circularly polarized light, enter sensor fibre.The Faraday magneto-optic effect of sensor fibre makes
Two bundle rotatory polarizations produce the phase shift being directly proportional to tested size of current.After two bundle circularly polarized lights are reflected mirror reflection,
Polarization mode exchanges, and again passes through sensor fibre, makes the nonreciprocal phase shift of generation double.Two bundle circular polarization
After light is again by λ/4 wave plate, revert to line polarized light.After the polarizer, carry the dry of phase information
Relate to light to be sent to collecting unit by circulator and demodulate tested current information.
Optical fiber temperature sensor temperature based on polarization maintaining optical fibre birefringence effect, by wide spectrum light source, circulator,
The polarizer and sensor fibre composition.The light that wide spectrum light source sends becomes line polarized light after the polarizer, enters
Polarization maintaining optical fibre, polarization maintaining optical fibre and sensor fibre are 45° angle welding, and the other end of sensor fibre is coated with total reflection
Film, it is achieved the reflection to incident illumination.When ambient temperature changes, temperature birefringence effect can change biography
In photosensitive fibre, the propagation constant of two eigen modes is poor, thus causes the phase difference between eigen mode to vary with temperature.
Signal processing unit uses special signal demodulation and fitting algorithm, the interference caused by detection because of phase difference
The energy variation of field, can obtain temperature information.
Temperature sensing probe and current sensing head are integrated in a housing, can be believed by the temperature of temperature probe
Breath knows the temperature information of current sensing head in same temperature field, and then realizes the temperature of all-fiber current transformator
Degree compensates.
Preferably, described optical fiber temperature sensor and all-fiber current transformator share wideband light source, depolarization
Device, 1 × 3 beam splitter and signal processor.
Preferably, described optical fiber temperature sensor and all-fiber current transformator share a polarization maintaining optical fibre biography
Lose cable.
Preferably, the sensor fibre of described optical fiber temperature sensor uses difference to clap long and guarantor's polarisation of length
Fine.
Preferably, one end of the sensor fibre of described fibre optic temperature sensor is coated with medium total reflection film.
The beneficial effects of the utility model are:
1. a kind of optical fiber temperature sensor of this utility model design, has high accuracy, low cost, has
The feature of good reciprocity, transmission range is unrestricted, uses special material and packaging technology, can meet
The remote temperature measurement demand of power industry different field.
2. this utility model designs a kind of all-fiber current transformator based on optical fiber temperature sensor, logical
Cross optical fiber temperature sensor and realize the temperature survey of sensing head part of all-fiber current transformator, with
Lower cost realizes the remote temperature of all-fiber current transformator and compensates.
3. this utility model designs a kind of all-fiber current transformator based on optical fiber temperature sensor, protects
Partially fibre optic temperature sensor and all-fiber current transformator share wideband light source, depolarizer, 1 × 3 beam splitter and
Signal processor, it is possible to reduce system cost, improves the integration capability of system.
4. this utility model designs a kind of all-fiber current transformator based on optical fiber temperature sensor, protects
Fibre optic temperature sensor partially shares a polarization maintaining optical fibre transmission with the analogue signal transmission of all-fiber current transformator
Optical cable, it is possible to reduce system cost, reduces product installation at the scene, connects up and protect difficulty.
Accompanying drawing explanation
Fig. 1: this utility model all-fiber current transformator based on optical fiber temperature sensor schematic diagram.
Detailed description of the invention
With detailed description of the invention, this utility model is further elaborated below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of all-fiber current transformator based on optical fiber temperature sensor, including wide range
Light source 1, depolarizer 2,1 × 3 beam splitter 3, first annular device the 4, second circulator 9, first polarizer
5, second polarizer 10, phase-modulator 6, fiber delay line 7, signal processor 8, polarization maintaining optical fibre pass
Lose cable 11, optical fiber λ/4 wave plate 12, fiber-optic current sensor ring 13, fiber reflector 14 and temperature sensing
Optical fiber 15.
The outfan of wide spectrum light source 1 is connected with the input of depolarizer 2, the outfan of depolarizer 2 and 1 × 3
The input of beam splitter 3 connects, the outfan 31 of 1 × 3 beam splitter 3 and the port of first annular device 4
41 connect, and incident illumination is sent to first polarizer 5 through port 42 by first annular device 4, and it is inclined to produce line
Light, the outfan of first polarizer 5 after polarization maintaining optical fibre, with the input port 61 of phase-modulator 6 in
45° angle welding, line polarisation is divided into two orthogonal bunch polarisations respectively along fast, the slow axis transmission of polarization maintaining optical fibre,
The output port 62 of phase-modulator 6 is connected with the input of fiber delay line 7, fiber delay line 7
Outfan is connected with polarization maintaining optical fibre transmission cable 11, and two orthogonal bunch polarisations are through polarization maintaining optical fibre transmission cable
After 11, arrive optical fiber λ/4 wave plate 12, become left-handed and dextrorotation circularly polarized light respectively, enter fibre-optic current
Sensing ring 13, fiber-optic current sensor ring 13 is wrapped in outside Primary Conductor and senses the magnetic field that tested electric current produces,
Left-handed and right-circularly polarized light is after fiber reflector 14 reflects, and polarization mode exchanges, and again passes through optical fiber
Current sense ring 13, after being then passed through optical fiber λ/4 wave plate 12, reverts to the line polarisation that two bundles are orthogonal, takes
After two bunch polarization interferences of belt current information, through first polarizer 5 and first annular device 4, by first
The port 43 of circulator 4 is sent to the input port 81 of signal processor 8, after opto-electronic conversion, and demodulation
Go out tested current information.In order to solve cosine sensitivity and the problem of directivity of system, improve the line of system
Property degree and dynamic range, system uses closed loop square-wave frequency modulation demodulation mode, and signal processor 8 passes through outfan
Mouthfuls 84 control ports 63 that square wave and Staircase wave signal be sent to phase-modulator 6, thus in system
The nonreciprocal 90 ° of phase bias of middle introducing, meanwhile, introduce feedback compensation phase shift by staircase waveform, offset electricity
The nonreciprocal phase shift that stream causes.
The System Working Principle of all-fiber current transformator is as follows:
According to the mode of each device of system, the light intensity signal of photodetector input can be obtained:
Wherein, I0For input light intensity, N is the sensor fibre number of turn, and V is the Fil moral (Verdet) of sensor fibre
Constant, I is tested electric current.Φs、ΦlIt is the square wave added and Staircase wave phase shift respectively.δ is to shaft angle
The equivalent error coefficient that the degree factor such as error, wave plate error in length causes.
Take square-wave frequency modulation phase shift phis=± pi/2, will carry out relevant solution with frequency square wave reference signal to PD output signal
Adjust, can obtain:
Idiff=I0[δsin(φl)-(1-δ)sin(4VNI+φl)] (2)
According to closed loop demodulating algorithm, staircase waveform produces feedback compensation phase shift ФlSo that Idiff=0, can obtain:
φl=-4VNI (1+ δ) (3)
Compensating phase shift ФlIt is demodulation output.
The output port 32 of 1 × 3 beam splitter 3 is connected with the input port 82 of signal processor 8, is used for supervising
Survey the changed power situation of wide spectrum light source 1.The output port 33 of 1 × 3 beam splitter 3 and the second circulator 9
Port 91 connect, incident illumination is sent to second polarizer 10 through port 92 by the second circulator 9, and produces
Raw line polarisation, the outfan of second polarizer 10 is after polarization maintaining optical fibre transmission cable 11, with temperature sensing
The input of optical fiber 15 is 45° angle welding, and line of incidence polarisation is divided into the line polarisation that two bundles are orthogonal, temperature
Sensor fibre 15 is clapped long and length polarization maintaining optical fibre and is constituted by difference, when ambient temperature changes, and temperature
Birefringence effect to change the propagation constant of pairwise orthogonal line polarisation in temperature sensing optical fiber 15 poor, thus cause
Phase difference between pairwise orthogonal line polarisation varies with temperature.The other end of temperature sensing optical fiber 15 is coated with total reflection
Film, it is achieved the reflection to pairwise orthogonal line polarisation.After carrying two line polarization interferences of temperature information, Jing Guo
Two polarizer 10 and the second circulators 9, are sent to signal processor 8 by the port 93 of the second circulator 9
Input port 83, after opto-electronic conversion, demodulates dut temperature information.
Temperature sensing optical fiber 15 and fiber-optic current sensor ring 13 are integrated in a housing, can be passed by temperature
Photosensitive fine 15 temperature informations detected know the temperature information of same temperature field inner fiber current sense ring 13,
And then realize the temperature-compensating of all-fiber current transformator.
The System Working Principle of optical fiber temperature sensor is as follows:
According to the mode of each device of system, the light intensity signal of photodetector input can be obtained:
Iout=1/2Iin[1+cos(2δx-2δy)] (4)
Wherein, δxAnd δyFast, the Phase delay of slow axis for temperature sensing optical fiber；IinFor incident illumination light intensity.
Due to variations in temperature, light is caused to change, by defeated in the propagation constant difference on fast, slow-axis direction
Go out light intensity IoutDetection, temperature information can be obtained.
Claims (5)
1. an all-fiber current transformator based on optical fiber temperature sensor, it is characterised in that: include
Optical fiber current mutual inductor and optical fiber temperature sensor, described optical fiber temperature sensor and fibre-optic current
The sensing head of transformer is integrated in same housing, and described optical fiber current mutual inductor and polarization maintaining optical fibre temperature pass
Sensor shares a set of wide spectrum light source (1), depolarizer (2), 1 × 3 beam splitter (3) and signal processing being sequentially connected with
Device (8), the input of described optical fiber current mutual inductor and optical fiber temperature sensor all with described 1 × 3 beam splitting
Device (3) is connected, the outfan of optical fiber current mutual inductor and optical fiber temperature sensor all with described signal at
Reason device (8) is connected.
A kind of full optical-fiber current mutual inductance based on optical fiber temperature sensor
Device, it is characterised in that: described optical fiber current mutual inductor also include first annular device or fiber coupler (4), first
The polarizer (5), phase-modulator (6), fiber delay line (7), optical fiber λ/4 wave plate (12), fiber-optic current sensor
Ring (13) and fiber reflector (14)；
The road output light that 1 × 3 beam splitter (3) exports is through first annular device or fiber coupler (4) and first
After the polarizer (5), inject phase-modulator (6), through phase-modulator (6) and fiber delay line (7) fast,
Slow axis transmits, then after polarization maintaining optical fibre transmission cable (11) and optical fiber λ/4 wave plate (12), simultaneously enters optical fiber
Current sense ring (13), the two bundle circularly polarized lights propagated in fiber-optic current sensor ring (13), two bundle circularly polarized lights
Arrive fiber reflector (14), after fiber reflector (14) reflects, be again introduced into fiber-optic current sensor ring (13),
Two bundle circularly polarized lights produce phase contrast again；
Carry two bundle circularly polarized lights of current information, behind optical fiber λ/4 wave plate (12), be changed into two bunch inclined
Shake light, and the light beam originally transmitted along fast axle enters slow axis, and originally along the light beam fast axle of entrance of slow axis transmission,
The interference signal of two bunch polarisations after first polarizer (5) and first annular device or fiber coupler (4), quilt
Being sent to signal processor (8) and demodulate tested current information, signal processor (8) outputs control signals to phase place and adjusts
The control port of device processed (6).
A kind of full optical-fiber current mutual inductance based on optical fiber temperature sensor
Device, it is characterised in that: described optical fiber temperature sensor also include the second circulator or fiber coupler (9),
Second polarizer (10) and temperature sensing optical fiber (15)；
The road output light that 1 × 3 beam splitter (3) exports is through the second circulator or fiber coupler (9) and second
The polarizer (10) forms line polarized light afterwards, line polarized light after polarization maintaining optical fibre transmission cable (11), implantation temperature
Sensor fibre (15), and it is divided into the orthogonal line polarisation of two bundles respectively along fast, the slow axis of temperature sensing optical fiber (15)
Transmission, the other end of temperature sensing optical fiber (15) is coated with total reflection film；
After carrying two bunch polarisations generation interference of temperature information, through second polarizer (10) and the second ring
Shape device or fiber coupler (9), and be sent to signal processor (8) and demodulate dut temperature information.
A kind of full optical-fiber current based on optical fiber temperature sensor is mutual
Sensor, it is characterised in that: described optical fiber temperature sensor and optical fiber current mutual inductor share one and protect partially
Fiber-optic transfer optical cable (11) is simulated signal transmission.
A kind of full optical-fiber current mutual inductance based on optical fiber temperature sensor
Device, it is characterised in that: described temperature sensing optical fiber (15) uses the guarantor of answer the bid mutually long and length inclined according to demand
Optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620527036.XU CN205786792U (en) | 2016-06-01 | 2016-06-01 | A kind of all-fiber current transformator based on optical fiber temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620527036.XU CN205786792U (en) | 2016-06-01 | 2016-06-01 | A kind of all-fiber current transformator based on optical fiber temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205786792U true CN205786792U (en) | 2016-12-07 |
Family
ID=58137165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620527036.XU Expired - Fee Related CN205786792U (en) | 2016-06-01 | 2016-06-01 | A kind of all-fiber current transformator based on optical fiber temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205786792U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970255A (en) * | 2017-05-16 | 2017-07-21 | 华中科技大学 | A kind of temperature strain offset-type fibre optic current sensor based on less fundamental mode optical fibre |
| CN107037253A (en) * | 2017-05-09 | 2017-08-11 | 山东电力设备有限公司 | A kind of all-fiber current transformator sensing head |
-
2016
- 2016-06-01 CN CN201620527036.XU patent/CN205786792U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037253A (en) * | 2017-05-09 | 2017-08-11 | 山东电力设备有限公司 | A kind of all-fiber current transformator sensing head |
| CN106970255A (en) * | 2017-05-16 | 2017-07-21 | 华中科技大学 | A kind of temperature strain offset-type fibre optic current sensor based on less fundamental mode optical fibre |
| CN106970255B (en) * | 2017-05-16 | 2019-07-09 | 华中科技大学 | A kind of temperature strain offset-type fibre optic current sensor based on less fundamental mode optical fibre |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105974172A (en) | All-fiber current transformer based on polarization maintaining fiber temperature sensor | |
| CN102628884B (en) | Closed-loop optical fiber current transformer | |
| CN101226210A (en) | Reflection type polarization irrespective miniaturization photo-electricity mutual-inductor | |
| US20210285987A1 (en) | Reflective current and magnetic sensors based on optical sensing with integrated temperature sensing | |
| CN106443551B (en) | A kind of all-fiber current transformator monitoring system | |
| CN103777062B (en) | Interference ring type all-fiber current transformer | |
| CN103743553B (en) | The dual channel optical performance testing device of a kind of integrated waveguide manipulator and polarization crosstalk identification thereof and processing method | |
| CN106526277B (en) | A kind of Novel light path sensing unit for low pressure optical current sensor | |
| CN107328977A (en) | The double sampled all-fiber current transformator of patrilineal line of descent with only one son in each generation sense and its method of work | |
| CN102426280B (en) | Reflection-type Sagnac interference fiber current sensor | |
| CN206696332U (en) | A kind of optical current mutual inductor | |
| CN201047858Y (en) | High intensity effect type full optical fiber reflection type optical current mutual inductor | |
| CN101968508B (en) | All-fiber current sensor and polarization state control method thereof | |
| CN113945744B (en) | All-fiber direct current transformer temperature compensation system and method | |
| CN106546793A (en) | Three-phase integratedization all-fiber current transformator | |
| CN104459267A (en) | Thin film type all-fiber current transformer with temperature compensation | |
| CN109696577A (en) | A kind of fibre optic current sensor and its measurement method of integrated temperature monitoring | |
| CN108287262B (en) | All-fiber current transformer temperature and vibration feedback compensation system and measurement method | |
| CN205786792U (en) | A kind of all-fiber current transformator based on optical fiber temperature sensor | |
| CN108254616A (en) | A kind of solenoid type optics small electric current sensor with temperature-compensating | |
| CN202330519U (en) | Optical current mutual inductor for magneto-optic glass using interference close-loop detection | |
| CN201749141U (en) | Full fiber current transformer | |
| CN109765417A (en) | A kind of the all-fiber current transformator sensing device and temperature compensation algorithm of embedding distribution formula temperature sensor | |
| CN207992311U (en) | A kind of solenoid type optics small electric current sensor with temperature-compensating | |
| CN108845174A (en) | A kind of differential type all-fiber current transformator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |