CN103698571B - There is current transformer arrangement and the bus current detection method of self energizing low-power consumption - Google Patents
There is current transformer arrangement and the bus current detection method of self energizing low-power consumption Download PDFInfo
- Publication number
- CN103698571B CN103698571B CN201410004034.8A CN201410004034A CN103698571B CN 103698571 B CN103698571 B CN 103698571B CN 201410004034 A CN201410004034 A CN 201410004034A CN 103698571 B CN103698571 B CN 103698571B
- Authority
- CN
- China
- Prior art keywords
- optical
- outfan
- input
- fiber
- signal
- 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.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 230000003287 optical Effects 0.000 claims abstract description 124
- 239000000835 fiber Substances 0.000 claims abstract description 94
- 239000003365 glass fiber Substances 0.000 claims abstract description 94
- 230000005693 optoelectronics Effects 0.000 claims description 80
- 230000003321 amplification Effects 0.000 claims description 28
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 17
- 230000002463 transducing Effects 0.000 claims description 14
- 238000003379 elimination reaction Methods 0.000 claims description 9
- 230000000051 modifying Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005291 magnetic Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002360 explosive Substances 0.000 description 2
- 230000005350 ferromagnetic resonance Effects 0.000 description 2
- 230000035800 maturation Effects 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 229910003327 LiNbO3 Inorganic materials 0.000 description 1
- 230000005697 Pockels effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
The invention discloses a kind of current transformer arrangement with self energizing low-power consumption, including sensing light source, quick optical attenuator, the first fiber coupler, the second fiber coupler, self energizing module, electro-optical feedback control circuit, primary current sensor and optical fiber shake monitoring modular, sensing light source and the first fiber coupler connect, one outfan of the first fiber coupler is connected with self energizing module, and another outfan is connected with quick optical attenuation；The electrical input of quick optical attenuator is connected with electro-optical feedback control circuit, and the light output end of quick optical attenuator and the second fiber coupler connect；The outfan of the second fiber coupler shakes monitoring modular with optical fiber and electro-optical feedback control circuit is connected, and electro-optical feedback control circuit is connected with primary current sensor；Self energizing module is connected with electro-optical feedback control circuit.This current transformer arrangement has effect of self energizing and low-power consumption.Also providing for bus current detection method, the method certainty of measurement is high simultaneously.
Description
Technical field
The invention belongs to power system monitoring and protection field, particularly to a kind of current transformer arrangement with self energizing low-power consumption and bus current detection method.
Background technology
In the operation of power generation, electric power transmission and power equipment, need wherein various physical quantitys are monitored, most important of which physical quantity is electric current and voltage, the sensor device obtaining electric current and information of voltage is transformer, and the big electric current of high-voltage side or high voltage are converted to small area analysis or the low-voltage of low-pressure side by them.Accurately, transformer reliable, high performance is to ensure that one of important guarantee of power grid security, reliable, Effec-tive Function.
Tradition transformer is based on electromagnetic transformer, but exposes its intrinsic magnetic saturation, ferromagnetic resonance in longtime running, dynamic range is little, frequency band range is narrow, the shortcoming such as inflammable, explosive.Meanwhile, along with the working voltage grade of electrical network is more and more higher, the insulating Design of tradition transformer will become extremely complex, and volume, weight and cost also sharply increase.
In recent decades, electronic current mutual inductor (ECT) and optical current mutual inductor (OCT) progressively rise, and instead of traditional electromagnetic transformer gradually.Compared with traditional electromagnetic transformer, electronic mutual inductor and optical current mutual inductor (OCT) have the advantage that excellent insulating properties, volume is little, cost is low；Without iron core, eliminate the problem such as magnetic saturation, ferromagnetic resonance；Keep Clear-High Voltage without open circuit for low-pressure side；Frequency response range width；The danger such as inflammable, explosive not produced because of oil-filled；Electro Magnetic Compatibility is good, strong security；Adapt to the trend of electric-power metering and protection digitized, intelligent development.
At present, optical current mutual inductor is by the need of primary power source, being divided into pure optical type (passive) and the big class of mixed type (active) two.In the sixties in 20th century, people utilize bubble Kerr effect (PockelsEffect) and Faraday effect (FaradyEffect) to have developed a series of pure optical current, voltage transformer, method is direct, device is simple, precision is high, it is disadvantageous in that the sensitivities such as light beats are answered in vibration, temperature, installation, measure less stable.
For these problems, mixed type optical current mutual inductor arises at the historic moment, and its certainty of measurement and reliability subjected to the test of Practical Project, technology maturation, have a extensive future.But owing to needing energy supply at high-pressure side, add cost and the complexity of system.The development of laser fiber energization schemes makes high pressure energy supply be achieved, but technique is monopolized by minority international corporation, holds at high price, and constrains the development of domestic electrical industry.
Therefore, the power consumption reducing high-pressure side becomes a developing direction of mixed type optical current mutual inductor.Calendar year 2001, the Central China University of Science and Technology proposes the OCT scheme by utilizing Rogowski coil, integrator and voltage-frequency converter, uses traditional CT energization schemes, but owing to the power consumption of voltage-frequency converter is relatively big, OCT overall power reduces inconspicuous.2005, University of British Columbia and Nxtphase company combine propose a kind of based on LiNbO3The mixing OCT scheme of crystal, passive integrator and Rogowski coil, its power consumption once held is zero.But non-linear by crystal and passive integrator impact, its available accuracy is unsatisfactory.
Summary of the invention
Technical problem: the technical problem to be solved is: a kind of current transformer arrangement with self energizing low-power consumption is provided, current transformer arrangement has effect of self energizing and low-power consumption, also providing for a bus current detection method, the method certainty of measurement is high simultaneously.
Technical scheme: for solving above-mentioned technical problem, the present invention adopts the following technical scheme that
A kind of current transformer arrangement with self energizing low-power consumption, this current transformer arrangement includes: sensing light source, fast tunable optical attenuator, splitting ratio is first fiber coupler of m:n, splitting ratio is second fiber coupler of p:q, self energizing module, electro-optical feedback control circuit, primary current sensor and optical fiber shake monitoring modular, the input of sense light source output terminal and the first fiber coupler connects, one outfan of the first fiber coupler is connected with self energizing module, another outfan of first fiber coupler is connected with the light input end of quick optical attenuation, the electrical input of fast tunable optical attenuator is connected with electro-optical feedback control circuit, the light output end of fast tunable optical attenuator and the second fiber coupler input connect, one outfan of the second fiber coupler is shaken monitoring modular with optical fiber and is connected, another outfan of second fiber coupler is connected with electro-optical feedback control circuit, electro-optical feedback control circuit is connected with primary current sensor；Self energizing module is connected with electro-optical feedback control circuit, for electro-optical feedback control circuit energy supply；M+n=100, and m >=1, n >=1；P+q=100, and p >=1, q >=1.
Further, described self energizing module includes beam splitter and photodiode array, beam splitter has an input and N number of outfan, photodiode array is in series by N number of photodiode, the input of beam splitter is as the input of self energizing module, the outfan of photodiode array is as from the outfan of functional module, the input of beam splitter and an outfan of the first fiber coupler connect, the outfan of beam splitter is connected with the input of photodiode array, and a photodiode in beam splitter outfan and photodiode array connects, the outfan of photodiode array is connected with electro-optical feedback control circuit, for energy supply；N is the integer be more than or equal to 2.
Further, described electro-optical feedback control circuit includes differential amplification module and the first optoelectronic receiver, the input of the first optoelectronic receiver, differential amplification module positive terminal as the input of electro-optical feedback control circuit, differential amplification module outfan is as the outfan of electro-optical feedback control circuit, the input of the first photoreceiver and an optical output port of the second fiber coupler connect, the outfan of the first optoelectronic receiver is connected with the negative phase end of differential amplification module, and the positive terminal of differential amplification module is connected with primary current sensor；The outfan of differential amplification module is connected with the drive end of fast tunable optical attenuator, is used for driving fast tunable optical attenuator.
Further, described optical fiber shake monitoring modular includes wavelength division multiplexer, fiber reflector, Wave decomposing multiplexer, optical circulator, monitoring light source, second optoelectronic receiver, 3rd optoelectronic receiver, divider and Kai Gen device, one input of wavelength division multiplexer shakes the input of monitoring modular as optical fiber, the outfan of divider shakes the outfan of monitoring modular as optical fiber, another input of wavelength division multiplexer is connected with fiber reflector, for transmission of monitoring light, the outfan of wavelength division multiplexer is connected with the input of Wave decomposing multiplexer, one outfan of Wave decomposing multiplexer and the input of the 3rd optoelectronic receiver connect, another outfan of Wave decomposing multiplexer is connected with an input of optical circulator, another input of optical circulator is connected with monitoring light source, the outfan of optical circulator and the input of the second optoelectronic receiver connect, the outfan of the second optoelectronic receiver is connected with the input driving root device, one input of the outfan and divider of driving root device is connected, another input of divider and the 3rd optoelectronic receiver outfan connect.
Further, described optical fiber shake monitoring modular includes the 4th optoelectronic receiver, direct current and exchanges separation module, divider, amplifier, the input of the 4th optoelectronic receiver shakes the input of monitoring modular as optical fiber, the outfan of amplifier shakes the outfan of monitoring modular as optical fiber, the outfan of the 4th optoelectronic receiver is connected with the input of direct current and exchange separation module, direct current is connected with two inputs of divider respectively with two outfans exchanging separation module, and the outfan of divider is connected with the input of amplifier.
A kind of bus current detection method of above-mentioned current transformer arrangement, this detection method includes procedure below: utilize sensing light source to produce sense light, sense light is divided into two parts after the first fiber coupler that splitting ratio is m:n, wherein, m% sense light inputs to photodiode array after beam splitter, to electro-optical feedback control circuit energy supply, n% sense light produces the optical signal after decay after fast tunable optical attenuator, the second fiber coupler is utilized to gather the output optical signal of fast tunable optical attenuator, the output optical signal of p% is carried out non-linear correction processing, reduce the first optical fiber shake and sensing light source shakes the interference brought, the Electro-optical Modulation that correction fast tunable optical attenuator brings is non-linear, simultaneously, the output light of q% is carried out jitter elimination process, reduce the second optical fiber and shake the interference brought；The first described optical fiber refers to the optical fiber being connected between sensing light source and the first fiber coupler, second optical fiber refers to the optical fiber being connected between the second fiber coupler and optical fiber shake monitoring modular, or connects the optical fiber between wavelength division multiplexer and Wave decomposing multiplexer.
Further, described non-linear correction processing process is: utilizes primary current sensor to obtain bus current signal, and produces primary current transducing signal, and meanwhile, the optical signal of the p% of the second fiber coupler output converts the signal of telecommunication to through the first optoelectronic receiver；Primary current transducing signal is carried out differential amplification computing with the signal of telecommunication after the first optoelectronic receiver conversion, produce new driving signal, for driving fast tunable optical attenuator, Electro-optical Modulation that fast tunable optical attenuator is brought is non-linear to be corrected, and reduces the first optical fiber shake simultaneously and sensing light source shakes the interference brought.
Further, described jitter elimination processing procedure is: utilize monitoring light source to produce monitoring light, this monitoring light sequentially passes through optical circulator, Wave decomposing multiplexer and wavelength division multiplexer, arrive fiber reflector, fiber reflector produces reflection light, this reflection light sequentially passes through wavelength division multiplexer, Wave decomposing multiplexer, optical circulator, arrive the second optoelectronic receiver, second optoelectronic receiver carries out opto-electronic conversion, the signal of telecommunication after conversion second signal of telecommunication after driving root device and obtaining sqrt, the q% of the second fiber coupler exports light and sequentially passes through wavelength division multiplexer, Wave decomposing multiplexer, arrive the 3rd optoelectronic receiver, 3rd optoelectronic receiver carries out opto-electronic conversion, produce first signal of telecommunication, second signal of telecommunication and the first signal are made division arithmetic, obtain output voltage signal；The second described optical fiber refers to the optical fiber connected between wavelength division multiplexer and Wave decomposing multiplexer.
Further, described jitter elimination processing procedure is: exports light from the q% of the second fiber coupler output and produces transducing signal after the 4th optoelectronic receiver conversion, respectively through direct current and exchange separation module, divider, amplifier, generation output voltage signal；The second described optical fiber refers to the optical fiber being connected between the second fiber coupler and optical fiber shake monitoring modular.
Beneficial effect: compared with prior art, present invention have the advantage that
(1) this equipment adopts super low-power consumption fast tunable optical attenuator, it is possible to effectively reduces high pressure and once holds power demands.The equipment of the present invention adopts self energizing scheme, without other energy-provision way, the output light of laser instrument is both as sense light, also serve as energy supply light, be effectively reduced cost, adopt the telecommunication optical fiber of existing maturation, photodiode (PhotoDiode) array simultaneously, reliability is high, good stability, simple in construction, cost is low.Electro-optical feedback control circuit is utilized to reduce the problems such as the drift of optical attenuation constant, the error that the drift of light source light power and optical fiber disturbance bring, non-linear, the light source shake of solution fast tunable optical attenuator and optical fiber disturbance.Utilize wavelength-division multiplex technique to realize the real-time monitoring that optical fiber is consumed along path loss simultaneously, eliminate the interference that optical fiber consumes along path loss, improve the precision and stability of equipment.Whole system uses pure analog circuit, eliminates digital circuit, simplifies circuit design, reduces cost.
(2) light source luminous power shake, optical fiber disturbance luminous power also can be made non-constant, cause that the Output optical power of fast tunable optical attenuator becomes non-linear relation with primary current.In order to solve the non-linear of optical attenuation constant and the problem of light source shake, improving the measuring precision, the present invention adopts electro-optical feedback to control the error that module the reduction drift of optical attenuation constant, the shake of light source and the disturbance of optical fiber bring.With the second fiber coupler, the output end signal of fast tunable optical attenuator is divided into two bundles.Part optical attenuation signal is converted to the signal of telecommunication through the first optoelectronic receiver, return to the negative phase end of differential amplification module, the primary current transducing signal produced with primary current sensor does difference, it is controlled regulating again through integration, integrating circuit, produces new driving voltage and be input to the drive end of fast tunable optical attenuator.The change of optical attenuation constant, the shake of light source and the disturbance of optical fiber can be fed back to the drive end of fast tunable optical attenuator by such design in time.When optical attenuation constant, sensing light source luminous power or fibre loss coefficient change, it is possible to control module by electro-optical feedback and dynamically regulate the driving signal of adjustable optical attenuator, thus ensureing that optical attenuation multiple and primary current are linear.
(3) compensated optical fiber perturbation error, improves the accuracy of system.The present invention adopts wavelength-division multiplex technique (WDM) to realize the monitoring to light path loss along the line, by the voltage signal proportional to luminous power carries out multiplication, division algorithm process, compensated optical fiber perturbation error in the 3rd optoelectronic receiver, improves the accuracy of system.The present invention also can adopt alternating current-direct current separation compensation method to realize the monitoring to light path loss along the line, the signal of the 4th optoelectronic receiver is processed, compensated optical fiber perturbation error, improves the accuracy of system.
Accompanying drawing explanation
Fig. 1 is the first structural representation of current transformer arrangement of the present invention.
Fig. 2 is the second structural representation of current transformer arrangement of the present invention.
Fig. 3 is the structural representation of self energizing module in the present invention.
Fig. 4 is that in the present invention, electro-optical feedback controls the structural representation of difference block in module.
Fig. 5 is that in the present invention, electro-optical feedback controls the circuit diagram of difference block in module.
Fig. 6 is the first structural representation of optical fiber shake monitoring modular in the present invention.
Fig. 7 is the second structural representation of optical fiber shake monitoring modular in the present invention.
Figure has: sensing light source 1, fast tunable optical attenuator 2, second fiber coupler 3, wavelength division multiplexer 4, Wave decomposing multiplexer 5, second optoelectronic receiver 6, 3rd optoelectronic receiver 7, optical circulator 8, monitoring light source 9, differential amplification module 10, primary current sensor 11, first optoelectronic receiver 13, fiber reflector 14, first fiber coupler 15, beam splitter 16, photodiode array 17, difference channel 18, scaling circuit 19, integrating circuit 20, peaker 21, 4th optoelectronic receiver 22, AC/DC separation module 23, divider 24, amplifier 25, output voltage 26, drive root device 27.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical scheme is described in detail.
As shown in Figure 1, a kind of current transformer arrangement with self energizing low-power consumption of the present invention, including: sensing light source 1, fast tunable optical attenuator 2, splitting ratio are first fiber coupler 15 of m:n, splitting ratio is second fiber coupler 3 of p:q, self energizing module, electro-optical feedback control circuit, primary current sensor 11 and optical fiber shake monitoring modular.The input of sensing light source 1 outfan and the first fiber coupler 15 connects, one outfan of the first fiber coupler 15 is connected with self energizing module, another outfan of first fiber coupler 15 is connected with the light input end of quick optical attenuation 2, the electrical input of fast tunable optical attenuator 2 is connected with electro-optical feedback control circuit, the light output end of fast tunable optical attenuator 2 and the second fiber coupler 3 input connect, one outfan of the second fiber coupler 3 is shaken monitoring modular with optical fiber and is connected, another outfan of second fiber coupler 3 is connected with electro-optical feedback control circuit, electro-optical feedback control circuit is connected with primary current sensor 11.Self energizing module is connected with electro-optical feedback control circuit, for electro-optical feedback control circuit energy supply.M+n=100, and m >=1, n >=1.Such as, m=99, n=1.P+q=100, and p >=1, q >=1, for instance, p=20, q=80.M, n, p, q are positive integer.
As it is shown on figure 3, self energizing module includes beam splitter 16 and photodiode array 17, beam splitter 16 has an input and N number of outfan, for 1*N beam splitter.Photodiode array 17 is in series by N number of photodiode, the input of beam splitter 16 is as the input of self energizing module, photodiode array (is called for short: PD array) outfan of 17 as from the outfan of functional module in literary composition, the input of beam splitter 16 and an outfan of the first fiber coupler 15 connect, the outfan of 1*N beam splitter 16 is connected with the input of photodiode array 17, and a photodiode in beam splitter 16 outfan and photodiode array 17 connects, the outfan of photodiode array 17 is connected with electro-optical feedback control circuit, for energy supply.N is the integer be more than or equal to 2.
By the sense light of the m% of the first fiber coupler 15 that splitting ratio is m:n through 1*N beam splitter 16, being divided into N and restraint light, be connected with photodiode array 17 respectively, N number of photodiode is connected into photodiode array 17, forms self energizing module.
Electro-optical feedback control circuit includes differential amplification module 10 and the first optoelectronic receiver 13, the input of the first optoelectronic receiver 13, differential amplification module 10 positive terminal as the input of electro-optical feedback control circuit, differential amplification module 10 outfan is as the outfan of electro-optical feedback control circuit, the input of the first photoreceiver 13 and an optical output port of the second fiber coupler 3 connect, the outfan of the first optoelectronic receiver 13 is connected with the negative phase end of differential amplification module 10, and the positive terminal of differential amplification module 10 is connected with primary current sensor 11；The outfan of differential amplification module 10 is connected with the drive end of fast tunable optical attenuator 2, is used for driving fast tunable optical attenuator 2.
With reference to Fig. 4, it is as follows that electro-optical feedback controls differential amplification module 10 concrete operations in module: the outfan of the first optoelectronic receiver 13 is connected with the negative phase end of difference channel 18, and the outfan of primary current sensor 11 is connected with the positive terminal of difference channel 18.The differential signal thus obtained produces to drive signal then through by scaling circuit 19, integrating circuit 20, peaker 21, it is input to the drive end of fast tunable optical attenuator 2, dynamically regulating the driving voltage of fast tunable optical attenuator 2, the optical attenuation constant reducing fast tunable optical attenuator 2 changes the error brought.
With reference to Fig. 4 and Fig. 5, the signal produced by the first optoelectronic receiver 13 is the 3rd signal of telecommunication.Differential amplification module 10 is made up of differential amplifier circuit and integral differential circuit, and wherein, differential amplifier circuit includes difference channel 18 and scaling circuit 19, and integral differential circuit includes integrating circuit 20 and peaker 21.Differential amplifier circuit is by the first operational amplifier A 1, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 composition.One end of first resistance R1 is as the first input end of differential amplifier circuit, and one end of the 3rd resistance R3 is as the second input of differential amplifier circuit, and the outfan of the first operational amplifier A 1 is as the outfan of differential amplifier circuit.The other end of the first resistance R1 and the first operational amplifier A 1 normal phase input end and second resistance R2 one end connect, the other end ground connection of the second resistance R2, the other end of the 3rd resistance R3 and the first operational amplifier A 1 negative-phase input and the 4th resistance R4 one end connect, and the other end of the 4th resistance R4 and the outfan of the first operational amplifier A 1 connect.Integral differential circuit is made up of the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, first electric capacity C1 and the second operational amplifier A 2.One end of 5th resistance R5 is as integral differential circuit input, and the second operational amplifier A 2 outfan is as integral differential circuit outfan.The other end of the 5th resistance R5 and the normal phase input end of the second operational amplifier A 2, one end of the 7th resistance R7 and one end of the first electric capacity C1 connect, the other end of the 7th resistance R7 and the outfan of the second operational amplifier A 2 connect, the other end of the first electric capacity C1 and one end of the 8th resistance R8 connect, the other end of the 8th resistance R8 and the outfan of the second operational amplifier A 2 connect, one end of 6th resistance R6 is connected with the negative-phase input of the second operational amplifier A 2, the other end ground connection of the 6th resistance R6.One end of primary current transducing signal and the first resistance R1 connects, and one end of the 3rd signal of telecommunication and the 3rd resistance R3 connects, and differential amplifier circuit outfan is connected with integral differential circuit input, and the outfan of integral differential circuit is connected with driving signal.In difference block, adopt the first operational amplifier A 1 to constitute differential amplifier circuit, undertaken primary current transducing signal and the 3rd signal of telecommunication doing difference and scaling.Adopt the second operational amplifier A the 2, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the first electric capacity C1 to constitute integral differential circuit, differential amplifier circuit is exported that signal is integrated, differentiating obtains driving signal.
In this application, optical fiber shake monitoring modular preferably two kinds of structures.
The first structure: as shown in figures 1 to 6, optical fiber shake monitoring modular includes wavelength division multiplexer 4, fiber reflector 14, Wave decomposing multiplexer 5, optical circulator 8, monitoring light source 9, second optoelectronic receiver 6, 3rd optoelectronic receiver 7, divider 24 and Kai Gen device 27, one input of wavelength division multiplexer 4 shakes the input of monitoring modular as optical fiber, the outfan of divider 24 shakes the outfan of monitoring modular as optical fiber, another input of wavelength division multiplexer 4 is connected with fiber reflector 14, for transmission of monitoring light, the outfan of wavelength division multiplexer 4 is connected with the input of Wave decomposing multiplexer 5, one outfan of Wave decomposing multiplexer 5 and the input of the 3rd optoelectronic receiver 7 connect, another outfan of Wave decomposing multiplexer 5 is connected with an input of optical circulator 8, another input of optical circulator 8 is connected with monitoring light source 9, the outfan of optical circulator 8 and the input of the second optoelectronic receiver 6 connect, the outfan of the second optoelectronic receiver 6 is connected with the input driving root device 27, one input of the outfan and divider 24 of driving root device 27 is connected, another input of divider 24 and the 3rd optoelectronic receiver 7 outfan connect.Optical circulator 8 switches over for the output light of the monitoring light that monitoring light source 9 is produced and Wave decomposing multiplexer 5.
The second structure: as shown in Figure 2 and Figure 7, optical fiber shake monitoring modular includes the 4th optoelectronic receiver 22, direct current with exchange separation module (in literary composition be called for short: AC/DC separation module) 23, divider 24, amplifier 25, the input of the 4th optoelectronic receiver 22 shakes the input of monitoring modular as optical fiber, the outfan of amplifier 25 shakes the outfan of monitoring modular as optical fiber, the outfan of the 4th optoelectronic receiver 22 is connected with the input of AC/DC separation module 23, two outfans of AC/DC separation module 23 are connected with two inputs of divider 24 respectively, the outfan of divider 24 is connected with the input of amplifier 25.
The bus current detection method of above-mentioned current transformer arrangement, including procedure below: utilize sensing light source 1 to produce sense light, sense light is divided into two parts after the first fiber coupler 15 that splitting ratio is m:n, wherein, m% sense light inputs to photodiode array 17 after 1*N beam splitter 16, module energy supply is controlled to electro-optical feedback, n% sense light produces the optical signal after decay after fast tunable optical attenuator 2, the second fiber coupler 3 is utilized to gather the output optical signal of fast tunable optical attenuator 2, the output optical signal of p% is carried out non-linear correction processing, reduce the first optical fiber shake and sensing light source shakes the interference brought, correct the Electro-optical Modulation that quick optical attenuator 2 brings non-linear, simultaneously, the output light of q% is carried out jitter elimination process, reduce the second optical fiber and shake the interference brought；The first described optical fiber refers to the optical fiber being connected between sensing light source 1 and the first fiber coupler 15, second optical fiber refers to the optical fiber being connected between the second fiber coupler 3 and optical fiber shake monitoring modular, or connects the optical fiber between wavelength division multiplexer 4 and Wave decomposing multiplexer 5.
In above-mentioned bus current detection method, described non-linear correction processing process is: utilize primary current sensor 11 to obtain bus current signal, and produce primary current transducing signal, meanwhile, the optical signal of the p% of the second fiber coupler 3 output converts the signal of telecommunication to through the first optoelectronic receiver 13；Primary current transducing signal is carried out differential amplification computing with the signal of telecommunication after the first optoelectronic receiver 13 conversion, produce new driving signal, for driving fast tunable optical attenuator 2, Electro-optical Modulation that fast tunable optical attenuator 2 is brought is non-linear to be corrected, and reduces the first optical fiber shake simultaneously and sensing light source shakes the interference brought.
When optical fiber shake monitoring modular selects the first structure, jitter elimination processing procedure in above-mentioned bus current detection method is: utilize monitoring light source 9 to produce monitoring light, this monitoring light sequentially passes through optical circulator 8, Wave decomposing multiplexer 5 and wavelength division multiplexer 4, arrive fiber reflector 14, fiber reflector 14 produces reflection light, this reflection light sequentially passes through wavelength division multiplexer 4, Wave decomposing multiplexer 5, optical circulator 8, arrive the second optoelectronic receiver 6, second optoelectronic receiver 6 carries out opto-electronic conversion, the signal of telecommunication after conversion second signal of telecommunication after driving root device 27 and obtaining sqrt, the q% of the second fiber coupler 3 exports light and sequentially passes through wavelength division multiplexer 4, Wave decomposing multiplexer 5, arrive the 3rd optoelectronic receiver 7, 3rd optoelectronic receiver 7 carries out opto-electronic conversion, produce first signal of telecommunication, second signal of telecommunication and the first signal are made division arithmetic, obtain output voltage signal 26.Second optoelectronic receiver 6 is the light receiving 1570nm, namely monitors the light of light source 9.3rd optoelectronic receiver 7 is the light receiving 1550nm, namely senses the light of light source 1.In this structure, the second optical fiber refers to the optical fiber connected between wavelength division multiplexer 4 and Wave decomposing multiplexer 5.
When optical fiber shake monitoring modular selects the second structure, jitter elimination processing procedure in above-mentioned bus current detection method is: exports light from the q% of the second fiber coupler 3 output and produces transducing signal after the 4th optoelectronic receiver 22 conversion, respectively through AC/DC separation module 23, divider 24, amplifier 25, produce output voltage signal 26.In this structure, the second optical fiber refers to the optical fiber being connected between the second fiber coupler 3 and optical fiber shake monitoring modular.
In the current transformer arrangement with self energizing low-power consumption of the present invention, sensing light source 1 produces sense light, and sense light is divided into two parts after the first fiber coupler 15, and m% sense light is after 1*N beam splitter 16, it is divided into N road light, inputs to photodiode array 17 for energy supply.N% sense light produces the optical signal after decay after fast tunable optical attenuator 2.Through the optical transport of fast tunable optical attenuator 2 in the second fiber coupler 3, light is divided into two-way, the light of one road p% is converted to the signal of telecommunication through fiber-optic transfer to the first optoelectronic receiver 13, this signal of telecommunication transmits the negative phase end to differential amplification module 10, difference is done with the primary current transducing signal of primary current sensor 11, obtain signal as driving signal, input the drive end to fast tunable optical attenuator 2.So can reduce the error owing to the optical path loss of the sensing unstability of light source 1, the first optical fiber brings.Simultaneously, when the attenuation constant generation nonlinear change of fast tunable optical attenuator 2, by this structure, the optical attenuation constant of change can be fed back to the drive end of fast tunable optical attenuator 2, the change utilizing driving voltage makes system recovery line balancing state, reduces the non-linear error brought of optical attenuation constant；The light of another road q% is through the second fiber-optic transfer to low-pressure end.For the optical path loss of the second optical fiber connecting high-pressure side and low-pressure end, main employing wavelength-division multiplex technique separates compensation technique to eliminate the interference of light path loss along the line with alternating current-direct current, and concrete scheme is as follows:
Scheme one
Such as Fig. 4, monitoring light source 9(1570nm) through fiber-optic transfer to optical circulator 8, optical circulator 8 by light through fiber-optic transfer to Wave decomposing multiplexer 5, then through fiber-optic transfer to wavelength division multiplexer 4, one window of wavelength division multiplexer 4 transmits light to fiber reflector 14, export light through the reflection light of fiber reflector 14 and the q% of the second fiber coupler 3 and be coupled into same optical fiber by wavelength division multiplexer 4, transmit through a segment distance, utilize Wave decomposing multiplexer 5 that optical signal is divided into the reflected light signal of fiber reflector 14 and the q% of the second fiber coupler 3 export optical signal.Wherein, the q% of the second fiber coupler 3 exports optical signal through fiber-optic transfer to the 3rd photelectric receiver 7, the 3rd photelectric receiver 7 be converted to the first signal of telecommunication V1, the reflected light signal of fiber reflector 14 through fiber-optic transfer to optical circulator 8, optical circulator 8 by light through fiber-optic transfer to the second optoelectronic receiver 6, the second optoelectronic receiver 6 be converted to the second signal of telecommunication V2, to V1,V2Carry out algorithm process, reduce being connected between wavelength division multiplexer 4 and Wave decomposing multiplexer 5 optical fiber b dissipation constant α along the line1The interference brought.Algorithm is as follows: set optical fiber b dissipation constant along the line as α1, the q% luminous power of the second fiber coupler 3 output is P1, the luminous power of monitoring light source 9 is P2, the light decay rate of fiber reflector is α, and luminous power and magnitude of voltage proportionality constant are β, then the first signal of telecommunication V of the 3rd photelectric receiver 7 conversion1=P1·α1β, the second signal of telecommunication V of the second optoelectronic receiver 6 conversion2=P2·α·α1 2β, V2Obtain through driving root device 27The input of divider 24 is divided into other V1、Both are divided by and can obtainThe output of divider is multiplied byThe transducing signal under the noiseless state of the ideal proportional to bus current signal can be obtained.
Scheme two
Such as Fig. 5, the q% of the second fiber coupler 3 exports light and is converted to the signal of telecommunication by the 4th optoelectronic receiver 22, and this signal of telecommunication is divided into exchange, DC component by AC/DC separation module 23, is transmitted separately to the input of divider 24.Divider 24 is by AC compounent divided by DC component, and acquired results transmission is to the input of amplifier 25, and the outfan of amplifier 25 is optical fiber and shakes revised signal.Algorithmic procedure is as follows: set the second optical fiber c dissipation constant along the line connected between the second fiber coupler 3 and optical fiber shake monitoring modular as α2, the amplification of amplifier 25 is A, and the q% luminous power of the second fiber coupler 3 output is P3, wherein constant optical power is P4, being superimposed upon the power in constant optical power is P5, so P3=P4+P5, luminous power and magnitude of voltage proportionality constant are β, then the signal of telecommunication V of the 4th optoelectronic receiver 22 conversion4=P3·α2·β=P4·α2·β+P5α 2 β is V through the AC signal that AC/DC separation module 23 processes5=P5·α2β, direct current signal is V6=P4·α2β, V5Divided by V6Optical fiber c loss α along the line can be eliminated2Impact, formula is V5/V6=P5·α2·β/(P4·α2·β)=P5/P4, amplifier 25 is output as A*V5/V6=A*P5/P4, due to P4It is constant, so amplifier 25 output is proportional to P5.In the bus current detection method of the present invention, sense light is produced by sensing light source 1, through the first fiber coupler 15, the sense light of m% is used for self energizing module, the sense light of n% is through fast tunable optical attenuator 2(FVOA, fastvariableopticalattenuator) produce the optical signal after decaying afterwards.Optical signal after described decay processes through two schemes, reduces optical fiber and shakes the interference brought, and produces output signal after opto-electronic conversion.Simultaneously, primary current sensor 11 is utilized to obtain the bus current signal on high-voltage line, after exporting the feedback signal of telecommunication of signal with fast tunable optical attenuator 2 and carrying out difference, amplification, integration, differential, produce new driving signal for driving fast tunable optical attenuator 2.
Claims (5)
1. a current transformer arrangement with self energizing low-power consumption, it is characterized in that, this current transformer arrangement includes: sensing light source (1), fast tunable optical attenuator (2), splitting ratio is first fiber coupler (15) of m:n, splitting ratio is second fiber coupler (3) of p:q, self energizing module, electro-optical feedback control circuit, primary current sensor (11) and optical fiber shake monitoring modular, the input of sensing light source (1) outfan and the first fiber coupler (15) connects, one outfan of the first fiber coupler (15) is connected with self energizing module, another outfan of first fiber coupler (15) is connected with the light input end of fast tunable optical attenuator (2), the electrical input of fast tunable optical attenuator (2) is connected with electro-optical feedback control circuit, the light output end of fast tunable optical attenuator (2) and the second fiber coupler (3) input connect, one outfan of the second fiber coupler (3) is shaken monitoring modular with optical fiber and is connected, another outfan of second fiber coupler (3) is connected with electro-optical feedback control circuit, electro-optical feedback control circuit is connected with primary current sensor (11)；Self energizing module is connected with electro-optical feedback control circuit, for electro-optical feedback control circuit energy supply；M+n=100, and m >=1, n >=1；P+q=100, and p >=1, q >=1；
Described optical fiber shake monitoring modular includes wavelength division multiplexer (4), fiber reflector (14), Wave decomposing multiplexer (5), optical circulator (8), monitoring light source (9), second optoelectronic receiver (6), 3rd optoelectronic receiver (7), divider (24) and drive root device (27), one input of wavelength division multiplexer (4) shakes the input of monitoring modular as optical fiber, the outfan of divider (24) shakes the outfan of monitoring modular as optical fiber, another input of wavelength division multiplexer (4) is connected with fiber reflector (14), for transmission of monitoring light, the outfan of wavelength division multiplexer (4) is connected with the input of Wave decomposing multiplexer (5), one outfan of Wave decomposing multiplexer (5) and the input of the 3rd optoelectronic receiver (7) connect, another outfan of Wave decomposing multiplexer (5) is connected with an input of optical circulator (8), another input of optical circulator (8) is connected with monitoring light source (9), the outfan of optical circulator (8) and the input of the second optoelectronic receiver (6) connect, the outfan of the second optoelectronic receiver (6) is connected with the input driving root device (27), one input of the outfan and divider (24) of driving root device (27) is connected, another input of divider (24) and the 3rd optoelectronic receiver (7) outfan connect；Or,
Described optical fiber shake monitoring modular includes the 4th optoelectronic receiver (22), direct current with exchange separation module (23), divider (24), amplifier (25), the input of the 4th optoelectronic receiver (22) shakes the input of monitoring modular as optical fiber, the outfan of amplifier (25) shakes the outfan of monitoring modular as optical fiber, the outfan of the 4th optoelectronic receiver (22) is connected with the input of direct current and exchange separation module (23), direct current is connected with two inputs of divider (24) respectively with two outfans exchanging separation module (23), the outfan of divider (24) is connected with the input of amplifier (25).
2. the current transformer arrangement with self energizing low-power consumption described in claim 1, it is characterized in that, described self energizing module includes beam splitter (16) and photodiode array (17), beam splitter (16) has an input and N number of outfan, photodiode array (17) is in series by N number of photodiode, the input of beam splitter (16) is as the input of self energizing module, the outfan of photodiode array (17) is as from the outfan of functional module, the input of beam splitter (16) and an outfan of the first fiber coupler (15) connect, the outfan of beam splitter (16) is connected with the input of photodiode array (17), and a photodiode in an outfan of beam splitter (16) and photodiode array (17) connects, the outfan of photodiode array (17) is connected with electro-optical feedback control circuit, for energy supply；N is the integer be more than or equal to 2.
3. the current transformer arrangement with self energizing low-power consumption described in claim 2, it is characterized in that, described electro-optical feedback control circuit includes differential amplification module (10) and the first optoelectronic receiver (13), the input of the first optoelectronic receiver (13), the positive terminal of differential amplification module (10) is as the input of electro-optical feedback control circuit, differential amplification module (10) outfan is as the outfan of electro-optical feedback control circuit, the input of the first optoelectronic receiver (13) and an optical output port of the second fiber coupler (3) connect, the outfan of the first optoelectronic receiver (13) is connected with the negative phase end of differential amplification module (10), the positive terminal of differential amplification module (10) is connected with primary current sensor (11)；The outfan of differential amplification module (10) is connected with the drive end of fast tunable optical attenuator (2), is used for driving fast tunable optical attenuator (2).
4. the bus current detection method of the current transformer arrangement utilized described in claim 1, it is characterized in that, this detection method includes procedure below: utilize sensing light source (1) to produce sense light, sense light is divided into two parts after the first fiber coupler (15) that splitting ratio is m:n, wherein, m% sense light is through self energizing module, to electro-optical feedback control circuit energy supply, n% sense light produces the optical signal after decay after fast tunable optical attenuator (2), the second fiber coupler (3) is utilized to gather the output optical signal of fast tunable optical attenuator (2), the output optical signal of p% is carried out non-linear correction processing, reduce the first optical fiber shake and sensing light source shakes the interference brought, the Electro-optical Modulation that correction fast tunable optical attenuator (2) brings is non-linear, simultaneously, the output light of q% is carried out jitter elimination process, reduce the second optical fiber and shake the interference brought；The first described optical fiber refers to the optical fiber being connected between sensing light source (1) and the first fiber coupler (15), second optical fiber refers to the optical fiber being connected between the second fiber coupler (3) and optical fiber shake monitoring modular, or connects the optical fiber between wavelength division multiplexer (4) and Wave decomposing multiplexer (5)；
Described jitter elimination processing procedure is: utilize monitoring light source (9) to produce monitoring light, this monitoring light sequentially passes through optical circulator (8), Wave decomposing multiplexer (5) and wavelength division multiplexer (4), arrive fiber reflector (14), fiber reflector (14) produces reflection light, this reflection light sequentially passes through wavelength division multiplexer (4), Wave decomposing multiplexer (5), optical circulator (8), arrive the second optoelectronic receiver (6), second optoelectronic receiver (6) carries out opto-electronic conversion, the signal of telecommunication after conversion second signal of telecommunication after driving root device (27) and obtaining sqrt, the q% of the second fiber coupler (3) exports light and sequentially passes through wavelength division multiplexer (4), Wave decomposing multiplexer (5), arrive the 3rd optoelectronic receiver (7), 3rd optoelectronic receiver (7) carries out opto-electronic conversion, produce first signal of telecommunication, second signal of telecommunication and first signal of telecommunication are made division arithmetic, obtain output voltage signal (26)；The second described optical fiber refers to the optical fiber connected between wavelength division multiplexer (4) and Wave decomposing multiplexer (5)；Or,
Described jitter elimination processing procedure is: the q% exported from the second fiber coupler (3) exports light generation transducing signal after the 4th optoelectronic receiver (22) conversion, respectively through direct current with exchange separation module (23), divider (24), amplifier (25), produce output voltage signal (26)；The second described optical fiber refers to the optical fiber being connected between the second fiber coupler (3) and optical fiber shake monitoring modular.
5. the bus current detection method of the current transformer arrangement described in claim 4, it is characterized in that, described non-linear correction processing process is: utilize primary current sensor (11) to obtain bus current signal, and produce primary current transducing signal, meanwhile, the optical signal of the p% that the second fiber coupler (3) exports converts the signal of telecommunication to through electro-optical feedback control circuit；Primary current transducing signal is carried out differential amplification computing with the signal of telecommunication after electro-optical feedback control circuit is changed, produce new driving signal, for driving fast tunable optical attenuator (2), Electro-optical Modulation that fast tunable optical attenuator (2) is brought is non-linear to be corrected, and reduces the first optical fiber shake simultaneously and sensing light source shakes the interference brought.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410004034.8A CN103698571B (en) | 2014-01-03 | 2014-01-03 | There is current transformer arrangement and the bus current detection method of self energizing low-power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410004034.8A CN103698571B (en) | 2014-01-03 | 2014-01-03 | There is current transformer arrangement and the bus current detection method of self energizing low-power consumption |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103698571A CN103698571A (en) | 2014-04-02 |
| CN103698571B true CN103698571B (en) | 2016-06-29 |
Family
ID=50360168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410004034.8A Active CN103698571B (en) | 2014-01-03 | 2014-01-03 | There is current transformer arrangement and the bus current detection method of self energizing low-power consumption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103698571B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9377489B2 (en) * | 2014-04-15 | 2016-06-28 | General Electric Company | Systems and methods for monitoring fiber optic current sensing systems |
| CN108732405B (en) * | 2018-06-19 | 2020-05-05 | 南京工程学院 | Passive optical intensity modulation type current transformer and bus current detection method |
| CN110763894B (en) * | 2018-07-27 | 2022-03-08 | 上海诺基亚贝尔股份有限公司 | Method, apparatus and computer storage medium for measurement |
| CN112583366B (en) * | 2020-12-21 | 2022-05-06 | 山东科技大学 | Photoelectrode voltage square root amplifying circuit and electric appliance |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10185961A (en) * | 1996-12-20 | 1998-07-14 | Mitsubishi Electric Corp | Light current transformer |
| CN2582130Y (en) * | 2002-10-29 | 2003-10-22 | 顺德特种变压器厂 | Active optical fibre current transformer |
| CN102608557B (en) * | 2012-03-19 | 2014-07-02 | 西安交通大学 | Photoelectric current transformer with online check function |
| CN103116055B (en) * | 2013-01-29 | 2016-01-13 | 长飞光纤光缆股份有限公司 | A kind of all-fiber current transformator system with temp sensing function |
| CN103399193B (en) * | 2013-08-05 | 2016-01-13 | 东南大学 | Based on bus current detection method and the current transformer arrangement of adjustable optical attenuator |
-
2014
- 2014-01-03 CN CN201410004034.8A patent/CN103698571B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103698571A (en) | 2014-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103837852B (en) | All-fiber electronic current transformer frequency characteristic test device and method of testing | |
| CN101521104B (en) | Full optical fiber current transformer adopting double closed loop control | |
| CN103698571B (en) | There is current transformer arrangement and the bus current detection method of self energizing low-power consumption | |
| CN102721847B (en) | Hybrid grating on-line temperature measurement type all-fiber current transformer and current detection method thereof | |
| CN103399193B (en) | Based on bus current detection method and the current transformer arrangement of adjustable optical attenuator | |
| CN103076155B (en) | Optical fiber Verdet constant measurement system on basis of double optical paths | |
| CN103777062B (en) | Interference ring type all-fiber current transformer | |
| CN102914679B (en) | Passive optical voltage transformer based on electrooptical effect | |
| CN102087307A (en) | High precision full optical fiber current mutual inductor | |
| CN102628884A (en) | Closed-loop optical fiber current transformer | |
| CN106645911A (en) | All-fiber current transformer for open loop independent double-sampling circuit based on single light path | |
| CN106443126B (en) | A kind of method and apparatus measuring electro-optic crystal half-wave voltage | |
| CN202649279U (en) | Closed-loop optical fiber current transformer | |
| CN103163351B (en) | A kind of optical voltage sensor of three-phase common light source | |
| CN102928656A (en) | Full-optical fiber current sensor system | |
| CN104655908A (en) | Signal transmission device and method for current transformer | |
| CN107994950A (en) | A kind of M-Z modulators quadrature bias point control device and its control method | |
| Li et al. | Signal detection for optical AC and DC voltage sensors based on Pockels effect | |
| CN101231311A (en) | Wide band high pressure intelligent resistance type current sensor | |
| CN103969501A (en) | Optical current sensor | |
| CN206460095U (en) | The all-fiber current transformator in the independent double sampled loop of the open loop based on single light path | |
| CN107422166B (en) | Modulation and demodulation method for suppressing light power fluctuation for optical fiber current transformer | |
| CN105281829A (en) | Light vector network analyzer based on Sagnac ring | |
| CN103245817B (en) | A kind of method of measuring voltage and voltage sensor | |
| CN202661524U (en) | Hybrid grating online temperature measurement type all-fiber current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |