CN104635010A - All-fiber optical current transformer detection system - Google Patents
All-fiber optical current transformer detection system Download PDFInfo
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- CN104635010A CN104635010A CN201510067181.4A CN201510067181A CN104635010A CN 104635010 A CN104635010 A CN 104635010A CN 201510067181 A CN201510067181 A CN 201510067181A CN 104635010 A CN104635010 A CN 104635010A
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Abstract
The invention discloses an all-fiber optical current transformer detection system. The all-fiber optical current transformer detection system comprises a sensing optical fiber ring, a light path system, a circuit system and a merging unit; the sensing optical fiber ring is used for acquiring a current signal of a to-be-detected position and generating a light intensity signal carrying data information of a Faraday rotation angle; the light path system is used for transmitting the data information to the circuit system by virtue of the optical fiber; the circuit system is used for receiving data information transmitted by the light path system and converting the data information to a circuit digital signal; the merging unit is used for receiving the circuit digital signal generated by the circuit system and outputting an identification signal. The current transformer adopts a special optical fiber winding way, so that the temperature drift can be effectively inhibited, the influence of the birefringence phenomenon on detection precision of an ordinary optical fiber transformer can be overcome, the birefringence phenomenon is influenced by the temperature, so that the precision drift of the detection precision caused along with the temperature variation exists.
Description
Technical field
The present invention relates to electrical network Intelligent Measurement field, especially relate to a kind of measurement system on all-fiber-optical current transducer.
Background technology
Along with the development in big strides of intelligent grid, based on the current transformer of one of nucleus equipment also welcome high-speed development period.Current transformer is except being applied to intelligent grid, also be successfully applied to multiple industrial circles such as naval electric systems, electrical network travelling wave ranging, high voltage direct current power transmission and transformation, DC ice melting, power quality monitoring, realize the measurement application of the multiple electricity parameter based on electric current, voltage.At present, carrying out in fields such as China 1000kV highest voltage level, the power transmission and transformation of new-energy grid-connected flexible direct current, track traffic electric power and thermonuclear fusion international co-operation big science engineerings and applying widely.
Traditional current transformer adopts Luo-coil, but this Luo-coil is easy to the interference being subject to strong-electromagnetic field.The blast that tradition mutual inductor causes because of insulating reliability difference and the defect such as electromagnetism is saturated, electromagnetic resonance or measure misalignment problem, makes the safety and stability of operation of power networks reduce.Tradition mutual inductor needs to consume a large amount of non-ferrous metals such as copper, aluminium, pollutes air, water etc.
Fibre-optic current voltage transformer (VT) also exists adaptability to environment and long term stability problem in electric system application process.And the fibre-optic current voltage transformer (VT) index of modulation is mutual inductor long-time stability with temperature drift effects.
Existing current transformer detection system, is therefore necessary to be improved.
Summary of the invention
For the deficiency that above-mentioned prior art exists, the object of this invention is to provide a kind of measurement system on all-fiber-optical current transducer, it has the advantages that to measure electrical network high pressure primary side current safety precise.
To achieve these goals, the technical solution adopted in the present invention is:
Measurement system on all-fiber-optical current transducer provided by the invention, comprises sensing fiber ring, light path system, Circuits System and merge cells;
Described sensing fiber ring, for obtaining the current signal at place to be measured and generating the data message that light intensity signal carries Faraday angle of rotation; Described light path system, for by optical fiber by data information transfer to Circuits System; Described Circuits System, for receiving light path system transfers data message and convert circuit digital signal to; Described merge cells, the circuit digital signal generated for receiving circuit system also exports identification signal.
Further, described sensing fiber ring is by wave plate and catoptron and Fiber connection.
Further, described merge cells comprises light source, coupling mechanism, detector, demodulation electronic circuit, the polarizer, polarization spectro and phase-modulator;
It is partially polarized light that the light that described light source sends is polarized after coupling mechanism that device rises, and described polarized light enters phase-modulator; Described phase-modulator is connected with sensing fiber ring by Transmission Fibers; Described phase-modulator is connected with demodulation electronic circuit; Described demodulation electronic circuit is connected with detector; Described detector is connected with coupling mechanism.
Further, also comprise the guarantor's polarisation cable being arranged at described phase-modulator input end, described guarantor's polarisation cable other end is connected with sensing fiber ring.
Further, described light source is wideband light source.
Further, described merge cells adopts method of interpolation to realize sensing fiber ring synchronous working.
Further, also comprise self-checking alarming module, described self-inspection and alarm module are used for the running status of monitoring fiber optic components box circuit component in real time.
Further, the route protection module, bus protection module, stabilized control system module, control module and the metering module that are connected with merge cells respectively is also comprised.
Adopt after said structure, the present invention compared to the prior art advantageously:
1, special Optical Fiber Winding mode is adopted, effectively inhibit temperature drift, overcome ordinary optic fibre mutual inductor accuracy of detection and be subject to the existing impact of fiber birefringence, birefringent phenomenon can be subject to the impact of temperature, thus there is the precision drift that accuracy of detection varies with temperature generation.
2, take special processing of circuit scheme, develop exclusive algorithmic system simultaneously, eliminate the impact that light source power instability causes, ensure that the precision and stability of system cloud gray model.After overcoming the long-time running of optical transformer system, the output power of light source two may produce relaxation phenomenon, the precision and stability of meeting influential system in time,
3, adopt reciprocal structure in a large number in the optical path, transducing signal by the same optical system of same fiber termination box, can overcome a large amount of optical defects when sending and receive, and improves the performances such as system anti-vibration, anti-interference and resisting temperature change simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is optical fiber current mutual inductor schematic diagram;
Fig. 2 is optical fiber current mutual inductor structural drawing;
Fig. 3 is all-fiber current transformator schematic diagram.
Embodiment
The following stated is only preferred embodiment of the present invention, does not therefore limit protection scope of the present invention.
Embodiment, see shown in Fig. 1 to Fig. 3:
The measurement system on all-fiber-optical current transducer that the present embodiment provides, comprises sensing fiber ring, light path system, Circuits System and merge cells;
Described sensing fiber ring, for obtaining the current signal at place to be measured and generating the data message that light intensity signal carries Faraday angle of rotation; Described light path system, for by optical fiber by data information transfer to Circuits System; Described Circuits System, for receiving light path system transfers data message and convert circuit digital signal to; Described merge cells, the circuit digital signal generated for receiving circuit system also exports identification signal.
Described sensing fiber ring is by wave plate and catoptron and Fiber connection.
Described merge cells comprises light source, coupling mechanism, detector, demodulation electronic circuit, the polarizer, polarization spectro and phase-modulator;
It is partially polarized light that the light that described light source sends is polarized after coupling mechanism that device rises, and described polarized light enters phase-modulator; Described phase-modulator is connected with sensing fiber ring by Transmission Fibers; Described phase-modulator is connected with demodulation electronic circuit; Described demodulation electronic circuit is connected with detector; Described detector is connected with coupling mechanism.
Also comprise the guarantor's polarisation cable being arranged at described phase-modulator input end, described guarantor's polarisation cable other end is connected with sensing fiber ring.
Described light source is wideband light source.
Described merge cells adopts method of interpolation to realize sensing fiber ring synchronous working.
Also comprise self-checking alarming module, described self-inspection and alarm module are used for the running status of monitoring fiber optic components box circuit component in real time.
Also comprise the route protection module, bus protection module, stabilized control system module, control module and the metering module that are connected with merge cells respectively.
Also comprise isolating switch, described isolating switch is arranged in circuit under test, and is connected with merge cells by optical fiber, and described isolating switch is used for monitoring circuit difference between current, if difference between current exceedes predetermined threshold value, then and this circuit under test of circuit breaker trip.
It is 1.5 × 10 that the all-fiber current transformator that the present embodiment provides measures maximum current value
6a, the corresponding time: 10ns; Adopt optical fibre gyro gordian technique, the Sagnac interference fringe detection method in optical fiber mutual inductor by the detection method of optical fibre gyro, can improve reliability and the environmental suitability of product.
In conjunction with the demand of electric system, propose and achieve the time and space full reciprocity optical interdferometer scheme; Propose wide frequency domain, complete-digital closed-loop adaptive modulation-demodulation technology, solve open loop and detect the little difficult problem of the range of linearity, achieve optical fiber current mutual inductor 10
7~ 10
8great dynamic range.
In conjunction with the environmental suitability requirement of electric system, have employed optical fiber low stress technique for coiling and equipment, solve the difficult problems such as optic fibre turning, tension force accurately control.Break through integrated optical device chip and tail optical fiber technology of preparing, solve optical fiber current mutual inductor device ambient stable sex chromosome mosaicism.Breach the modulation /demodulation of optical interdferometer complete-digital closed-loop and gain-adaptive control technology, solve the difficult problem of the fibre-optic current voltage transformer (VT) index of modulation with temperature drift.In mutual inductor long-time stability, launch deep research, carry out accelerated aging and accuracy testing to new integrated optical device to the base light electron device affecting mutual inductor long-time stability, performance drift reduces more than 1 magnitude.
The wide dynamic range of the sensor that the present embodiment provides; the linearity is good; stability is strong; with the Fiber connection of high-insulation between its high-pressure side and low-pressure side; compared with conventional high-pressure current transformer; along with the raising of electric pressure; production cost is not exponentially increase; but slightly increase; can be used for the measurement from several ten thousand volts to 1,000,000 volts of power network currents; can realize the functions such as electric current metering, distributing electric power, relay protection and automatic control, automatic monitoring, along with the development of China's power industry, its application prospect is very wide.In sensing material (magneto-optic glass or optical fiber) in magnetic field, the polarization direction of the polarized light of transmission can rotate because of magnetic field, and this rotation angle is Faraday angle of rotation, and magnetic field is directly proportional to primary current, and Faraday angle of rotation is directly proportional to magnetic field.The light intensity signal of analyzer output light carries the information of Faraday angle of rotation, can obtain primary current.
Optical fiber current mutual inductor widely uses at present, other structure and principle same as the prior art, repeat no more here.
Claims (8)
1. measurement system on all-fiber-optical current transducer, is characterized in that: comprise sensing fiber ring, light path system, Circuits System and merge cells;
Described sensing fiber ring, for obtaining the current signal at place to be measured and generating the data message that light intensity signal carries Faraday angle of rotation; Described light path system, for by optical fiber by data information transfer to Circuits System; Described Circuits System, for receiving light path system transfers data message and convert circuit digital signal to; Described merge cells, the circuit digital signal generated for receiving circuit system also exports identification signal.
2. measurement system on all-fiber-optical current transducer according to claim 1, is characterized in that: described sensing fiber ring is by wave plate and catoptron and Fiber connection.
3. measurement system on all-fiber-optical current transducer according to claim 1, is characterized in that: described merge cells comprises light source, coupling mechanism, detector, demodulation electronic circuit, the polarizer, polarization spectro and phase-modulator;
It is partially polarized light that the light that described light source sends is polarized after coupling mechanism that device rises, and described polarized light enters phase-modulator; Described phase-modulator is connected with sensing fiber ring by Transmission Fibers; Described phase-modulator is connected with demodulation electronic circuit; Described demodulation electronic circuit is connected with detector; Described detector is connected with coupling mechanism.
4. measurement system on all-fiber-optical current transducer according to claim 1, is characterized in that: also comprise the guarantor's polarisation cable being arranged at described phase-modulator input end, and described guarantor's polarisation cable other end is connected with sensing fiber ring.
5. measurement system on all-fiber-optical current transducer according to claim 1, is characterized in that: described light source is wideband light source.
6. measurement system on all-fiber-optical current transducer according to claim 1, is characterized in that: described merge cells adopts method of interpolation to realize sensing fiber ring synchronous working.
7. measurement system on all-fiber-optical current transducer according to claim 1, is characterized in that: also comprise self-checking alarming module, and described self-inspection and alarm module are used for the running status of monitoring fiber optic components box circuit component in real time.
8. measurement system on all-fiber-optical current transducer according to claim 1, is characterized in that: also comprise the route protection module, bus protection module, stabilized control system module, control module and the metering module that are connected with merge cells respectively.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964681A (en) * | 2015-07-16 | 2015-10-07 | 陕西华燕航空仪表有限公司 | Self-detecting circuit and self-detecting method for open-loop optical fiber gyroscope |
| 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 |
| CN106324323A (en) * | 2016-08-30 | 2017-01-11 | 中国西电电气股份有限公司 | All-optical-fiber current transformer and current measuring method thereof |
| CN106841740A (en) * | 2017-01-24 | 2017-06-13 | 国网辽宁省电力有限公司盘锦供电公司 | A kind of anti-interference type all-fiber current transformator |
| 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 |
| CN109870632A (en) * | 2019-03-07 | 2019-06-11 | 华中科技大学 | The self-calibration type current transformer of separable ampere grade exchange and microampere order direct current |
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| CN103235167A (en) * | 2013-03-28 | 2013-08-07 | 国家电网公司 | Flexible optical current transformer |
| CN103869135A (en) * | 2014-03-24 | 2014-06-18 | 武汉长盈通光电技术有限公司 | All-fiber current transformer with dual-protection function |
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| JP4669469B2 (en) * | 2006-11-29 | 2011-04-13 | 東日本旅客鉄道株式会社 | Reflective optical fiber current sensor |
| CN101571556A (en) * | 2008-04-30 | 2009-11-04 | 上海新跃仪表厂 | Sagnac interferometer type all-fiber current transformator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104964681A (en) * | 2015-07-16 | 2015-10-07 | 陕西华燕航空仪表有限公司 | Self-detecting circuit and self-detecting method for open-loop optical fiber gyroscope |
| 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 |
| CN106324323A (en) * | 2016-08-30 | 2017-01-11 | 中国西电电气股份有限公司 | All-optical-fiber current transformer and current measuring method thereof |
| CN106324323B (en) * | 2016-08-30 | 2019-09-06 | 中国西电电气股份有限公司 | A kind of all-fiber current transformator and its current measuring method |
| CN106841740A (en) * | 2017-01-24 | 2017-06-13 | 国网辽宁省电力有限公司盘锦供电公司 | A kind of anti-interference type all-fiber current transformator |
| CN109870632A (en) * | 2019-03-07 | 2019-06-11 | 华中科技大学 | The self-calibration type current transformer of separable ampere grade exchange and microampere order direct current |
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Application publication date: 20150520 |