CN103235167A - Flexible optical current transformer - Google Patents
Flexible optical current transformer Download PDFInfo
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- CN103235167A CN103235167A CN201310105537XA CN201310105537A CN103235167A CN 103235167 A CN103235167 A CN 103235167A CN 201310105537X A CN201310105537X A CN 201310105537XA CN 201310105537 A CN201310105537 A CN 201310105537A CN 103235167 A CN103235167 A CN 103235167A
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- current transformer
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Abstract
The invention relates to a flexible optical current transformer which comprises an optical fiber current sensing ring, a transmission optical fiber and a collecting unit. The optical fiber current sensing ring is wound on the periphery of a conductor tested for once. One end of the transmission optical fiber is connected with the optical fiber current sensing ring while the other end of the same is connected with the collecting unit. Compared with the prior art, the flexible optical current transformer is flexible in mounting method, strong in anti-jamming capability, needless for insulation, high in stability, and capable of well meeting requirements on construction of intelligentized transformer substations.
Description
Technical field
The present invention relates to a kind of mutual inductor, especially relate to a kind of flexible optical current transformer.
Background technology
Flexible mounting means is the exclusive a kind of mounting means of optics mutual inductor, the sensor fibre softness characteristics of bending have flexibly been taken full advantage of, have flexible for installation, easy maintenance, adaptability strong, need not to consider advantage such as insulation, the sensor fibre ring be convenient to be installed in any conductor around, the convenient measurement point that in system, temporarily or forever increases, can when substation operation, install at any time simultaneously, need not test line and have a power failure, be particularly useful for engineerings such as transformer station's transformation.
But according to investigation, have only Canadian Nxtphase company to develop Related product at present in the world and in engineering with being used, domestic similar products are not developed as yet, do not see the report that engineering is used yet.For adapting to the needs of power system development, break the technical monopoly of external product, guarantee the safe and stable operation of China's network system, it is significant to research and develop domestic flexible optical current transformer.
To be environmental factors such as temperature variation, vibration, stress can produce considerable influence to the sensing accuracy of sensor fibre and stability to the greatest factor that all the time limits the optical current mutual inductance, this mainly be because:
1, the linear birefrigence meeting that exists in the sensor fibre ring produces system's probe current information and disturbs;
2, the variation of the phase delay of λ/4 wave plates can cause the variation of the scale factor of mutual inductor, and influences precision and the stability of mutual inductor;
3, the skeleton that twines of optical fiber can exert an influence to fiber optic loop, and the vibration of skeleton simultaneously and effect such as expand with heat and contract with cold also can influence mutual inductor and measure.
Summary of the invention
Purpose of the present invention be exactly provide in order to overcome the defective that above-mentioned prior art exists that a kind of mounting means is flexible, antijamming capability strong, need not to insulate, stability is high, satisfied the flexible optical current transformer of the demand of intelligent transformer substation construction preferably.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of flexible optical current transformer, it is characterized in that, comprise fiber-optic current sensor ring, Transmission Fibers and collecting unit, described fiber-optic current sensor ring is wrapped in tested Primary Conductor periphery, described Transmission Fibers one end connects the fiber-optic current sensor ring, and the other end connects collecting unit.
Described collecting unit comprises light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, photo-detector and demodulator circuit, described light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, demodulator circuit, photo-detector connect successively, described photo-detector is connected with coupling mechanism, and described phase-modulator is connected with Transmission Fibers.
Described Transmission Fibers is the armouring optical cable.
Described fiber-optic current sensor ring output port is provided with wave plate and catoptron.
Described wave plate is
Wave plate.
The magnetic field that described fiber-optic current sensor ring utilizes the Faraday magneto-optic effect induction primary current of polarized light in optical fiber to produce, the output light signal is connected to collecting unit by Transmission Fibers.
Described collecting unit carries out computing to the light signal that receives and obtains primary current.
Described fiber-optic current sensor ring twines with the optical cable form, filling oily substance in the optical cable, and sensor fibre is immersed in the oil,
Described sensor fibre adopts low birefringent fiber.
Compared with prior art, the present invention has the following advantages:
1, the present invention adopts the flexible optical current transformer of reflective Sagnac interferometer structure, realize reciprocal structure by a catoptron, return through original route after can making two bundle crossed polarized light reflections, it is the complete symmetry light path, can reduce temperature, vibration, stress etc. to the influence of light path, make stability of layout improve, be subjected to the influence of environmental change littler, guaranteed that optical current mutual inductor has good stable and temperature characterisitic.
2, the present invention selects low birefringent fiber as sensor fibre, and the high conformity of low birefringent fiber own, linear birefrigence are little, and temperature influence is less.
3, the sensor fibre ring twines with the optical cable form among the present invention, filling oily substance in the optical cable, sensor fibre is immersed in the oil, the influence such as expand with heat and contract with cold of stress, vibration, the oil that can evenly disperse optical cable to be subjected to, also can effectively stop in other mounting means to improve mutual inductor stability because twining influences such as stress that skeleton causes, vibration.
Description of drawings
Fig. 1 is structured flowchart of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of flexible optical current transformer, comprise fiber-optic current sensor ring 1, Transmission Fibers 4 and collecting unit 5, described fiber-optic current sensor ring 1 is wrapped in tested Primary Conductor 6 peripheries, described Transmission Fibers 4 one ends connect fiber-optic current sensor ring 1, and the other end connects collecting unit 5.
Described collecting unit 5 comprises light source 51, coupling mechanism 52, the polarizer 53, polarization splitting prism 54, phase-modulator 55, photo-detector 57 and demodulator circuit 56, described light source 51, coupling mechanism 52, the polarizer 53, polarization splitting prism 54, phase-modulator 55, demodulator circuit 56, photo-detector 57 connect successively, described photo-detector 57 is connected with coupling mechanism 52, and described phase-modulator 55 is connected with Transmission Fibers 4.
Described Transmission Fibers 4 is the armouring optical cable.Described fiber-optic current sensor ring 1 output port is provided with wave plate 3 and catoptron 2.Described wave plate 3 is
Wave plate.
Principle of work is the magnetic field that the fiber-optic current sensor ring utilizes the Faraday magneto-optic effect induction primary current of polarized light in optical fiber to produce; Output signal is connected to collecting unit by Transmission Fibers, and the light signal that Transmission Fibers is sent collecting unit is transported to fiber-optic current sensor ring end, and the signal that the current sense ring is returned is delivered to collecting unit and handled simultaneously; Collecting unit is sent to sensor side with the light signal that light source produces; the light signal that carries primary current information that the while receiving sensor returns; and the light signal that returns handled; calculate the primary current value; and this primary current is sent to carries out each synchronised in the merge cells; export devices such as protection, measurement, metering afterwards to, also can be directly and computerized measurement and protective device interface.
Collecting unit adopts the realization of reflection type optical fiber Sagnac interference technique to the measurement of light signal, and reflection type optical fiber Sagnac interference technique has reduced the influence that sensor is disturbed by factors such as environment temperature, vibration, has improved sensor accuracy.
The light that comes out from phase-modulator enters the polarization maintaining optical fibre lag line.Two main shafts of polarization maintaining optical fibre lag line and the main shaft of phase-modulator are consistent, it has two effects: 1, passing to sensor fibre with sensor fibre every the light that gets far light source, phase-modulator output, sensor fibre and light source, detector and signal processing electronic circuit are separated.2, the high birefringence optical fiber of sufficient length provides enough time delays, light in polarization maintaining optical fibre lag line and sensor fibre round trip during this period of time in, the modulation waveform that is added to phase-modulator just changes half period.
The polarization maintaining optical fibre lag line come out two the bundle polarized lights respectively along its two spindle vibration, this two-beam through 45 ° of pads after, enter
Wave plate,
The main shaft of wave plate and polarization maintaining optical fibre lag line is at 45, enters sensor fibre then.
The effect of wave plate is that the two bundle cross line polarisations that polarization maintaining optical fibre lag line two main shafts come out are converted to rotatory polarization.
Wave plate is the long polarization maintaining optical fibre of one little section long bat, and its length is the long odd-multiple of 1/4 bat.
From
What wave plate came out is the opposite rotatory polarizations of two rotation directions.Direction of vibration is along the light quilt of polarization maintaining optical fibre lag line X-axis
Wave plate converts the dextrorotation rotatory polarization to, and direction of vibration is along the light quilt of polarization maintaining optical fibre lag line Y-axis
Wave plate converts left-handed rotatory polarization to.Owing to there is electromagnetic field around the sensor fibre, this two bundles rotatory polarization transmits in sensor fibre with friction speed, and the phase differential of accumulation is directly proportional with the magnetic field that is applied to sensor fibre.The end of sensor fibre is connected with a catoptron.Total reflection takes place in the two bundle rotatory polarizations that transmit in the low-birefringence sensor fibre after running into catoptron, the two rotation direction changes.Return after reflection in the way, dextrorotation rotatory polarization originally becomes left-handed rotatory polarization, and left-handed rotatory polarization originally becomes the dextrorotation rotatory polarization.Because rotation direction and the transmission direction of two rotatory polarizations all change when returning, the accumulation relative phase shift of the two doubles.Like this, total phase shift Δ φ=4VNI, wherein V is the Verdet constant of sensor fibre, and N is the number of turns that is wrapped in current lead sensor fibre on every side, and I is the size of current in the lead.
Two bundle rotatory polarizations transmit one back and forth and warp in sensor fibre
Behind the wave plate, originally the line polarisation along HiBi fibre delay line X axis vibration becomes when returning along the line polarisation of HiBi fibre delay line Y axis vibration, originally the line polarisation along HiBi fibre delay line Y axis vibration becomes when returning along the line polarisation of HiBi fibre delay line X axis vibration, this two bunch polarisation passes through phase-modulator again, behind 45 ° of pads, interfere at polarizer place.Light after the interference is coupled device and tells part arrival PD detector.
In light path, two-beam has experienced identical polarization variations in reverse order.Sensor fibre is positioned at the centre of two-beam light path, and unique phase differential of two-beam is to be caused by the magnetic field that sensing unit exists.
The PD detector detects is light intensity after two-beam is interfered, wherein includes the phasic difference information of the two, also just includes the information of magnetic field and electric current.
In above-mentioned optical device the Fibre Optical Sensor ring and
Wave plate is the major part of fibre optic current sensor, and Transmission Fibers is passed from insulator, and other optical device then concentrates in the collecting unit substantially.
Claims (9)
1. flexible optical current transformer, it is characterized in that, comprise fiber-optic current sensor ring, Transmission Fibers and collecting unit, described fiber-optic current sensor ring is wrapped in tested Primary Conductor periphery, described Transmission Fibers one end connects the fiber-optic current sensor ring, and the other end connects collecting unit.
2. a kind of flexible optical current transformer according to claim 1, it is characterized in that, described collecting unit comprises light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, photo-detector and demodulator circuit, described light source, coupling mechanism, the polarizer, polarization splitting prism, phase-modulator, demodulator circuit, photo-detector connect successively, described photo-detector is connected with coupling mechanism, and described phase-modulator is connected with Transmission Fibers.
3. according to the described a kind of flexible optical current transformer of claim l, it is characterized in that described Transmission Fibers is the armouring optical cable.
4. a kind of flexible optical current transformer according to claim 1 is characterized in that, described fiber-optic current sensor ring output port is provided with wave plate and catoptron.
5. a kind of flexible optical current transformer according to claim 4 is characterized in that described wave plate is
Wave plate.
6. according to the described a kind of flexible optical current transformer of claim l, it is characterized in that, the magnetic field that described fiber-optic current sensor ring utilizes the Faraday magneto-optic effect induction primary current of polarized light in optical fiber to produce, the output light signal is connected to collecting unit by Transmission Fibers.
7. a kind of flexible optical current transformer according to claim 6 is characterized in that, described collecting unit carries out computing to the light signal that receives and obtains primary current.
8. a kind of flexible optical current transformer according to claim 1 is characterized in that, described fiber-optic current sensor ring twines with the optical cable form, filling oily substance in the optical cable, and sensor fibre is immersed in the oil.
9. according to the described a kind of flexible optical current transformer of claim l, it is characterized in that described sensor fibre adopts low birefringent fiber.
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| CN201310105537XA CN103235167A (en) | 2013-03-28 | 2013-03-28 | Flexible optical current transformer |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635010A (en) * | 2015-02-06 | 2015-05-20 | 宁波永耀信息科技有限公司 | All-fiber optical current transformer detection system |
| CN105044424A (en) * | 2015-06-30 | 2015-11-11 | 易能乾元（北京）电力科技有限公司 | All-fiber current transformer with integrated light path and manufacturing process thereof |
| CN105445521A (en) * | 2014-08-22 | 2016-03-30 | 南京南瑞继保电气有限公司 | Optical voltage transformer |
| CN106940394A (en) * | 2017-04-24 | 2017-07-11 | 南京南瑞继保电气有限公司 | It is a kind of to realize the method that optical current mutual inductor is measured at a high speed |
| CN106940395A (en) * | 2017-04-24 | 2017-07-11 | 南京南瑞继保电气有限公司 | A kind of optical current mutual inductor |
| CN107621587A (en) * | 2016-07-14 | 2018-01-23 | 大唐观音岩水电开发有限公司 | A kind of ground short circuit fault distinguishing method based on optical current mutual inductor |
| CN108663649A (en) * | 2017-03-28 | 2018-10-16 | 上海润京能源科技有限公司 | Current transformer flexibility calibration equipment |
| CN109709372A (en) * | 2018-11-28 | 2019-05-03 | 中国矿业大学 | A kind of subway/coal mine stray electrical current fibre optical sensor closed-loop control device and method |
| CN110108960A (en) * | 2019-05-16 | 2019-08-09 | 国家电网有限公司 | A kind of portable fiber-optic custom power quality detection and analysis device |
| WO2024114315A1 (en) * | 2022-11-30 | 2024-06-06 | 中国南方电网有限责任公司超高压输电公司电力科研院 | Optical fiber insulator and current measurement device |
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| JPH08254550A (en) * | 1995-03-16 | 1996-10-01 | Toshiba Corp | Optical current transformer |
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| JP2008134192A (en) * | 2006-11-29 | 2008-06-12 | East Japan Railway Co | Reflection type optical fiber current sensor |
| CN101446600A (en) * | 2008-09-28 | 2009-06-03 | 中国矿业大学 | Optical fiber current sensing device used for monitoring subway stray current |
| CN102087307A (en) * | 2010-12-22 | 2011-06-08 | 广东中钰科技有限公司 | High precision full optical fiber current mutual inductor |
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| JPH08254550A (en) * | 1995-03-16 | 1996-10-01 | Toshiba Corp | Optical current transformer |
| US6281672B1 (en) * | 1996-08-30 | 2001-08-28 | Kabushiki Kaisha Toshiba | Optical current transformer |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445521A (en) * | 2014-08-22 | 2016-03-30 | 南京南瑞继保电气有限公司 | Optical voltage transformer |
| CN104635010A (en) * | 2015-02-06 | 2015-05-20 | 宁波永耀信息科技有限公司 | All-fiber optical current transformer detection system |
| CN105044424A (en) * | 2015-06-30 | 2015-11-11 | 易能乾元（北京）电力科技有限公司 | All-fiber current transformer with integrated light path and manufacturing process thereof |
| CN105044424B (en) * | 2015-06-30 | 2018-01-23 | 马鞍山万兆科技有限公司 | A kind of all-fiber current transformator and its manufacture craft with integrated light path |
| CN107621587A (en) * | 2016-07-14 | 2018-01-23 | 大唐观音岩水电开发有限公司 | A kind of ground short circuit fault distinguishing method based on optical current mutual inductor |
| CN108663649A (en) * | 2017-03-28 | 2018-10-16 | 上海润京能源科技有限公司 | Current transformer flexibility calibration equipment |
| CN108663649B (en) * | 2017-03-28 | 2023-12-29 | 上海润京能源科技有限公司 | Current transformer Flexible checking device |
| CN106940394A (en) * | 2017-04-24 | 2017-07-11 | 南京南瑞继保电气有限公司 | It is a kind of to realize the method that optical current mutual inductor is measured at a high speed |
| CN106940395A (en) * | 2017-04-24 | 2017-07-11 | 南京南瑞继保电气有限公司 | A kind of optical current mutual inductor |
| CN106940395B (en) * | 2017-04-24 | 2023-12-29 | 南京南瑞继保电气有限公司 | Optical current transformer |
| CN109709372A (en) * | 2018-11-28 | 2019-05-03 | 中国矿业大学 | A kind of subway/coal mine stray electrical current fibre optical sensor closed-loop control device and method |
| CN110108960A (en) * | 2019-05-16 | 2019-08-09 | 国家电网有限公司 | A kind of portable fiber-optic custom power quality detection and analysis device |
| WO2024114315A1 (en) * | 2022-11-30 | 2024-06-06 | 中国南方电网有限责任公司超高压输电公司电力科研院 | Optical fiber insulator and current measurement device |
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Application publication date: 20130807 |