CN203164256U - Novel all-fiber current transformer for smart power grid - Google Patents
Novel all-fiber current transformer for smart power grid Download PDFInfo
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- CN203164256U CN203164256U CN 201320120581 CN201320120581U CN203164256U CN 203164256 U CN203164256 U CN 203164256U CN 201320120581 CN201320120581 CN 201320120581 CN 201320120581 U CN201320120581 U CN 201320120581U CN 203164256 U CN203164256 U CN 203164256U
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Abstract
The utility model provides a novel all-fiber current transformer for a smart power grid. The novel all-fiber current transformer comprises a phase lock amplification unit which is used for modulating to-be-detested signals and improving signal to noise ratio, a sampling integrating unit which is used for receiving output signals of the phase lock amplification unit and for replying a periodic or quasi-periodic waveforms immersed in noise, a detection unit which is connected with the sampling integrating unit and detects signals output by the sampling integrating unit and a reference signal, and an autocorrelation noise cancellation unit which filters noise signals detected by the detection unit, wherein the autocorrelation noise cancellation unit is connected with an output end of the detection unit. The all-fiber current transformer uses an all-fiber structure for sensing, and the unique novel filter solves problems of magnetic saturation, ferroresonance and difficulty in digitization of a conventional electromagnetic current transformer. The all-fiber current transformer can help to eliminate false signal processing, temperature drift and interference, so that a produced smart power grid using the all-fiber current transformer product has very good environment adaptability and practicality.
Description
Technical field
The utility model relates to the power measurement field, relates in particular to a kind of novel all-fiber current transformator of used for intelligent electric network.
Background technology
Power industry is the basic industries of national economic development, has critical role in the development of the national economy.Current transformer is the visual plant of electric system electric energy metrical and protection control; be the important component part of electric system electric energy metrical, relay protection, system diagnostics and monitoring analysis, its measuring accuracy, operational reliability are to realize the prerequisite of power system security, economical operation.In " 2009 UHV transmission technology international conference ", State Grid Corporation of China proposes China and wants all-round construction unified " strong intelligent grid ".In " 12 " planning outline, clearly proposing the intelligent grid construction is current strategic new industry emphasis.
And current transformer is as one of most important instrument in the intelligent grid of electric system, and its function is equivalent to " eyes " of intelligent grid.State Grid Corporation of China thinks that " generating, transmission of electricity, power transformation, distribution, electricity consumption and the scheduling that the intelligent grid of China comprises electric system be totally six links, has informationization, digitizing, robotization, interactive ' intelligence ' technical characterictic." and this has just proposed information-based, digitized requirement to the current transformer as intelligent grid " eyes ".Along with the improving constantly of line voltage grade in the electric system, capacity constantly increase, traditional electromagnetic current transducer has exposed following major defect gradually:
(1) magnetic saturation, ferroresonance problem are arranged;
(2) the measurement dynamic range is little, and precision is low;
(3) problem of temperature drift is arranged;
(4) output quantity mostly is analog quantity, is difficult to digitizing, can not satisfy the needs of intelligent grid.
The utility model content
The purpose of this utility model is to overcome the defective of prior art, provides a kind of and has handled spurious signal, gets rid of temperature drift and got rid of the all-fiber current transformator that disturbs.
The utility model is achieved in that a kind of novel all-fiber current transformator of used for intelligent electric network, comprises for the modulation measured signal and is used for improving the phase-locked amplifying unit of signal to noise ratio (S/N ratio); Receive described phase-locked amplifying unit output signal and be used for to reply cycle of being submerged in noise or like the Sampling Integral unit of periodic waveform; The detecting unit that links to each other with described Sampling Integral unit and signal and the reference signal of its output detected and will be by the auto-correlation noise cancellation unit of the detected noise signal institute filtering of described detecting unit; Described auto-correlation noise cancellation unit connects the output terminal of described detecting unit.
Further, described phase-locked amplifying unit comprises phase sensitive detector and is used for improving the low-pass filter of measured signal signal to noise ratio (S/N ratio).
Further, described low-pass filter comprises voltage follower and the filter construction for isolation signals source and back circuit.
Further, described Sampling Integral unit comprises an integrator.
The utility model provides used for intelligent electric network a kind of novel all-fiber current transformator, comprises for the modulation measured signal and is used for improving the phase-locked amplifying unit of signal to noise ratio (S/N ratio); Receive described phase-locked amplifying unit output signal and be used for to reply cycle of being submerged in noise or like the Sampling Integral unit of periodic waveform; The detecting unit that links to each other with described Sampling Integral unit and signal and the reference signal of its output detected and will be by the auto-correlation noise cancellation unit of the detected noise signal institute filtering of described detecting unit; Described auto-correlation noise cancellation unit connects the output terminal of described detecting unit.All-fiber current transformator adopts all optical fibre structure sensing, and the new mode filter of its uniqueness is broken through traditional electromagnetic current transducer magnetic saturation, ferroresonance, and output quantity mostly is analog quantity, is difficult to problems such as digitizing.The all-fiber current transformator measurement data accurately and reliably, meet the requirement of intelligent grid development, brand-new filtering technique is got rid of spurious signal and is handled, temperature drift and eliminating are disturbed, and make the used for intelligent electric network all-fiber current transformator product of production have good environmental suitability and practicality.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The all-fiber current transformator circuit theory diagrams that Fig. 1 provides for the utility model embodiment;
The phase-locked amplifying unit circuit connection diagram that Fig. 2 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
All-fiber current transformator uses following principle of work at work:
1. Faraday magnetooptical effect (Faraday Magneto-optical effect)
When linearly polarized light is propagated in medium, if add a magnetic field in the direction of propagation that is parallel to light, then optical vibration direction will deflect, and deflection angle is directly proportional with the product that magnetic induction density and light pass through the length of medium, and yawing moment depends on medium character and magnetic field.Above-mentioned phenomenon is called Faraday effect or magnetic rotation effect;
2. the Sagnac principle of interference is measured (Sagnac interferometer)
Any variation meeting of optical path difference causes the movement of interference fringe very delicately between two bundle coherent lights.Can measure light path minor alteration amount by the mobile variation of interference fringe, thereby record therewith relevant other physical quantitys (as electric current).Measuring accuracy is decided by the precision of measurement of optical path difference, fringe spacing of the every movement of interference fringe, optical path difference just change a wavelength (～1000nm), so interferometer is the unit measurement of optical path difference with the optical wavelength, the height of its measuring accuracy is that any other measuring method is incomparable;
3. Amp (Ampere circuital theorem)
Along any one zone boundary magnetic vector is carried out integration, its numerical value equals the summation by the electric current in this zone boundary. and the shape in this theorem and zone, distance or which kind of material are irrelevant.According to Ampere theorem, any closed-loop vector integration of the stray field (disturbing magnetic field) that adjacent conductor produces is zero.Also namely, the interference of adjacent conductors has no effect to NXCT.Because deflection angle ψ=VBl=V * ∫ dB/dl * l=0, ψ is deflection angle here, and B is magnetic induction density, and V is called Verdet constant.So the outer magnetic field of any closed loop does not influence the measurement in the closed loop.
As Fig. 1-Fig. 2, the utility model embodiment provides used for intelligent electric network a kind of novel all-fiber current transformator, mainly extract measured signal from feeble signal (signal that is flooded by noise), it comprises for the modulation measured signal and is used for improving the phase-locked amplifying unit 100 of signal to noise ratio (S/N ratio); Receive described phase-locked amplifying unit 100 output signals and be used for to reply cycle of being submerged in noise or like the Sampling Integral unit 200 of periodic waveform; The detecting unit 300 that links to each other with described Sampling Integral unit 200 and signal and the reference signal 500 of its output detected and will be by the auto-correlation noise cancellation unit 400 of the detected noise signal institute filtering of described detecting unit 300; Described auto-correlation noise cancellation unit 400 connects the output terminal of described detecting unit 300.All-fiber current transformator adopts all optical fibre structure sensing, and the new mode filter of its uniqueness is broken through traditional electromagnetic current transducer magnetic saturation, ferroresonance, and output quantity mostly is analog quantity, is difficult to problems such as digitizing.The all-fiber current transformator measurement data accurately and reliably, meet the requirement of intelligent grid development, brand-new filtering technique is got rid of spurious signal and is handled, temperature drift and eliminating are disturbed, and make the used for intelligent electric network all-fiber current transformator product of production have good environmental suitability and practicality.
In concrete the application, as Fig. 1, Fig. 2, described phase-locked amplifying unit 100 is used for modulating measured signal, makes it satisfy the requirement that signal is handled, and described phase-locked amplifying unit 100 comprises phase sensitive detector 110 and is used for improving the low-pass filter 120 of measured signal signal to noise ratio (S/N ratio).Particularly, described low-pass filter 120 comprises voltage follower and the filter construction for isolation signals source and back circuit.Voltage follower mainly is the circuit of isolation signals source and back, makes the input impedance of filter construction for infinitely great, thereby can be not influential to the signal of signal source.
Further, described Sampling Integral unit comprises an integrator, and the door integrator mainly is to reply cycle or the quasi-periodic waveform that is submerged in the noise.
The present embodiment all-fiber current transformator is applicable to intelligent grid, meets the strategy of power system development intelligent grid; And be particularly useful for extra-high voltage grid, the strategy that meets power system development extra-high voltage grade electrical network, the all-fiber current transformator cardinal principle is by detecting optical fiber light signal, light signal is converted into electric signal, and by the optical-electric module read output signal, signal is handled, and the signal after will handling is then given corresponding process chip and is gone to analyze.Need to prove, signal is sent into lock-in amplifier after photoelectricity transforms, after the lock-in amplifier modulation, give the Sampling Integral device, the Sampling Integral device detects signal with characteristics periodically and carries out coherent detection through the reference signal that postpones to handle, and is noise according to the incoherent signal of filtering as a result that detects.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (4)
1. a kind of novel all-fiber current transformator of used for intelligent electric network is characterized in that, comprises for the modulation measured signal and is used for improving the phase-locked amplifying unit of signal to noise ratio (S/N ratio); Receive described phase-locked amplifying unit output signal and be used for to reply cycle of being submerged in noise or like the Sampling Integral unit of periodic waveform; The detecting unit that links to each other with described Sampling Integral unit and signal and the reference signal of its output detected and will be by the auto-correlation noise cancellation unit of the detected noise signal institute filtering of described detecting unit; Described auto-correlation noise cancellation unit connects the output terminal of described detecting unit.
2. a kind of novel all-fiber current transformator of used for intelligent electric network as claimed in claim 1 is characterized in that: described phase-locked amplifying unit comprises phase sensitive detector and is used for improving the low-pass filter of measured signal signal to noise ratio (S/N ratio).
3. a kind of novel all-fiber current transformator of used for intelligent electric network as claimed in claim 2, it is characterized in that: described low-pass filter comprises voltage follower and the filter construction for isolation signals source and back circuit.
4. a kind of novel all-fiber current transformator of used for intelligent electric network as claimed in claim 1, it is characterized in that: described Sampling Integral unit comprises an integrator.
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| CN 201320120581 CN203164256U (en) | 2013-03-15 | 2013-03-15 | Novel all-fiber current transformer for smart power grid |
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| CN 201320120581 CN203164256U (en) | 2013-03-15 | 2013-03-15 | Novel all-fiber current transformer for smart power grid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188053A (en) * | 2018-09-25 | 2019-01-11 | 国网黑龙江省电力有限公司佳木斯供电公司 | High-power transformer iron core grounding current on-line monitoring system |
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2013
- 2013-03-15 CN CN 201320120581 patent/CN203164256U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188053A (en) * | 2018-09-25 | 2019-01-11 | 国网黑龙江省电力有限公司佳木斯供电公司 | High-power transformer iron core grounding current on-line monitoring system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN SKYEE OPTICAL FIBER COMMUNICATION TECHNOL Free format text: FORMER NAME: SHENZHEN TIANYI FIBRE-OPTICAL COMMUNICATION TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518000 No. 1001 Nanshan Chi Park C3 building 16 floor Patentee after: Sky, Shenzhen intelligence development net Science and Technology Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili Office Ma Kan Road No. 31 5 5 floor Patentee before: Shenzhen Skyee Optical Fiber Communication Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20190315 |