CN103698571A - Current transformer equipment with effects of self energy supply and low consumption and bus current detecting method - Google Patents
Current transformer equipment with effects of self energy supply and low consumption and bus current detecting method Download PDFInfo
- Publication number
- CN103698571A CN103698571A CN201410004034.8A CN201410004034A CN103698571A CN 103698571 A CN103698571 A CN 103698571A CN 201410004034 A CN201410004034 A CN 201410004034A CN 103698571 A CN103698571 A CN 103698571A
- Authority
- CN
- China
- Prior art keywords
- optical
- output terminal
- input end
- optical fiber
- fiber
- 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.)
- Granted
Links
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The invention discloses current transformer equipment with effects of energy self-supply and low consumption. The current transformer equipment comprises a sensing light source, a fast optical attenuator, a first optical fiber coupler, a second optical fiber coupler, an energy self-supply module, an optoelectrical feedback control circuit, a primary current sensor and an optical fiber jitter monitoring module, wherein the sensing light source is connected with the first optical fiber coupler, one output end of the first optical fiber coupler is connected with the energy self-supply module, the other output end of the first optical fiber coupler is connected with the fast optical attenuator, the electricity input end of the fast optical attenuator is connected with the optoelectrical feedback control circuit, the light output end of the fast optical attenuator is connected with the second optical fiber coupler, the output end of the second optical fiber coupler is connected with the optical fiber jitter monitoring module and the optoelectrical feedback control circuit, the optoelectrical feedback control circuit is connected with the primary current sensor, and the energy self-supply module is connected with the optoelectrical feedback control circuit. The current transformer equipment has the effects of energy self-supply and low consumption. The invention also provides a bus current detecting method which is high in measuring precision.
Description
Technical field
The invention belongs to power system monitoring and protection field, particularly a kind of current transformer equipment and bus current detection method with self energizing low-power consumption.
Background technology
In service at electrical production, electric power transfer and power equipment, need to monitor various physical quantitys wherein, wherein most important physical quantity is electric current and voltage, the sensor device that obtains electric current and information of voltage is mutual inductor, and they are converted to the large electric current of high-voltage side or high voltage little electric current or the low-voltage of low-pressure side.Accurately, reliable, high performance mutual inductor is to guarantee one of power grid security, important guarantee reliable, efficiently operation.
Tradition mutual inductor be take electromagnetic transformer as main, but in long-time running, exposes its intrinsic magnetic saturation, ferroresonance, 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, it is very complicated that the insulating Design of traditional mutual inductor will become, 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 have replaced gradually traditional electromagnetic transformer.Compare with traditional electromagnetic transformer, electronic mutual inductor and optical current mutual inductor (OCT) have the following advantages: good insulating property, volume is little, cost is low; , containing iron core, the problems such as magnetic saturation, ferroresonance have not been eliminated; Keep Clear-High Voltage without open circuit for low-pressure side; Frequency response range is wide; Not because of the oil-filled danger such as inflammable, explosive producing; Electro Magnetic Compatibility is good, strong security; Adapted to the trend of electric-power metering with protection digitizing, intelligent development.
At present, optical current mutual inductor, by whether needing primary power source, is divided into pure optical type (passive) and the large class of mixed type (active) two.In the sixties in 20th century, people utilize bubble Kerr effect (Pockels Effect) and Faraday effect (Farady Effect) to develop a series of pure optical current, voltage transformer (VT), method is direct, device is simple, precision is high, but its shortcoming is: vibration, temperature, installation are answered to the sensitivities such as light beats, and Measurement sensibility is poor.
For these problems, mixed type optics current transformer arises at the historic moment, and its measuring accuracy and reliability have stood the test of Practical Project, and technology maturation has a extensive future.But owing to needing energy supply at high-pressure side, increased cost and the complicacy of system.The development of laser fiber energy supply scheme is achieved high pressure energy supply, but technique is monopolized by minority international corporation, holds at high price, and has restricted the development of domestic power industry.
Therefore, the power consumption of reduction high-pressure side becomes a developing direction of mixed type optics current transformer.Calendar year 2001, the Central China University of Science and Technology has proposed by utilizing the OCT scheme of Rogowski coil, integrator and voltage-frequency converter, use be traditional CT energy supply scheme, but because the power consumption of voltage-frequency converter is larger, it is not obvious that OCT overall power reduces.2005, University of British Columbia and Nxtphase company combine proposed a kind of based on LiNbO
3the mixing OCT scheme of crystal, passive integrator and Rogowski coil, its power consumption of once holding is zero.But be subject to the impact of the non-linear and passive integrator of crystal, its realistic accuracy is unsatisfactory.
Summary of the invention
Technical matters: technical matters to be solved by this invention is: a kind of current transformer equipment with self energizing low-power consumption is provided, current transformer equipment has the effect of self energizing and low-power consumption, a bus current detection method is also provided simultaneously, and the method measuring accuracy is high.
Technical scheme: for solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of current transformer equipment with self energizing low-power consumption, this current transformer equipment comprises: sensing light source, fast tunable optical attenuator, splitting ratio is the first fiber coupler of m:n, splitting ratio is the second fiber coupler of p:q, self energizing module, electro-optical feedback control circuit, primary current sensor and optical fiber shake monitoring modular, sense light source output terminal is connected with the input end of the first fiber coupler, an output terminal of the first fiber coupler is connected with self energizing module, another output terminal of the first fiber coupler is connected with the light input end of fast light decay, 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 is connected with the second fiber coupler input end, an output terminal of the second fiber coupler is connected with optical fiber shake monitoring modular, another output terminal of the 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, is the energy supply of electro-optical feedback control circuit, m+n=100, and m >=1, n >=1, p+q=100, and p >=1, q >=1.
Further, described self energizing module comprises beam splitter and photodiode array, beam splitter has an input end and N output terminal, photodiode array is in series by N photodiode, the input end of beam splitter is as the input end of self energizing module, the output terminal of photodiode array is as the output terminal from functional module, the input end of beam splitter is connected with an output terminal of the first fiber coupler, the output terminal of beam splitter is connected with the input end of photodiode array, and an output terminal of beam splitter is connected with a photodiode in photodiode array, the output terminal of photodiode array is connected with electro-optical feedback control circuit, for energy supply, N is more than or equal to 2 integer.
Further, described electro-optical feedback control circuit comprises differential amplification module and the first optoelectronic receiver, the positive terminal of the input end of the first optoelectronic receiver, differential amplification module is as the input end of electro-optical feedback control circuit, differential amplification module output terminal is as the output terminal of electro-optical feedback control circuit, the input end of the first photoreceiver is connected with an optical output port of the second fiber coupler, the output terminal 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 output terminal of differential amplification module is connected with the drive end of fast tunable optical attenuator, for driving fast tunable optical attenuator.
Further, described optical fiber shake monitoring modular comprises wavelength division multiplexer, fiber reflector, Wave decomposing multiplexer, optical circulator, monitoring light source, the second optoelectronic receiver, the 3rd optoelectronic receiver, divider and Kai Gen device, an input end of wavelength division multiplexer is as the input end of optical fiber shake monitoring modular, the output terminal of divider is as the output terminal of optical fiber shake monitoring modular, another input end of wavelength division multiplexer is connected with fiber reflector, for transmission of monitoring light, the output terminal of wavelength division multiplexer is connected with the input end of Wave decomposing multiplexer, an output terminal of Wave decomposing multiplexer is connected with the input end of the 3rd optoelectronic receiver, another output terminal of Wave decomposing multiplexer is connected with an input end of optical circulator, another input end of optical circulator is connected with monitoring light source, the output terminal of optical circulator is connected with the input end of the second optoelectronic receiver, the output terminal of the second optoelectronic receiver is connected with the input end of driving root device, open the output terminal of root device and an input end of divider is connected, another input end of divider is connected with the 3rd optoelectronic receiver output terminal.
Further, described optical fiber shake monitoring modular comprises the 4th optoelectronic receiver, direct current and exchanges separation module, divider, amplifier, the input end of the 4th optoelectronic receiver is as the input end of optical fiber shake monitoring modular, the output terminal of amplifier is as the output terminal of optical fiber shake monitoring modular, the output terminal of the 4th optoelectronic receiver is connected with the input end that exchanges separation module with direct current, direct current is connected with two input ends of divider respectively with two output terminals that exchange separation module, and the output terminal of divider is connected with the input end of amplifier.
A kind of bus current detection method of above-mentioned current transformer equipment, this detection method comprises following process: utilize sensing light source to produce sense light, after the first fiber coupler that sense light is m:n through splitting ratio, be divided into two parts, wherein, m% sense light inputs in photodiode array after beam splitter, to the energy supply of electro-optical feedback control circuit, n% sense light produces the light signal after decay after fast tunable optical attenuator, utilize the second fiber coupler to gather the output optical signal of fast tunable optical attenuator, the output optical signal of p% is carried out to non-linear correction processing, reduce the interference that the first optical fiber shake and the shake of sensing light source bring, the electrooptical modulation that correction fast tunable optical attenuator brings is non-linear, simultaneously, output light to q% carries out jitter elimination processing, reduce the interference that the second optical fiber shake brings, the first described optical fiber refers to the optical fiber being connected between sensing light source and the first fiber coupler, the 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: utilize primary current sensor to obtain bus current signal, and produce primary current transducing signal, meanwhile, the light signal of the p% of the second fiber coupler output converts electric signal to through the first optoelectronic receiver; Primary current transducing signal and the electric signal after the first optoelectronic receiver conversion are carried out to differential amplification computing, produce new driving signal, be used for driving fast tunable optical attenuator, the non-linear correction of electrooptical modulation that fast tunable optical attenuator is brought reduced the interference that the first optical fiber shake and the shake of sensing light source bring simultaneously.
Further, described jitter elimination processing procedure is: utilize monitoring light source to produce monitoring light, this monitoring light passes through optical circulator successively, Wave decomposing multiplexer and wavelength division multiplexer, arrive fiber reflector, fiber reflector produces reflected light, this reflected light passes through wavelength division multiplexer successively, Wave decomposing multiplexer, optical circulator, arrive the second optoelectronic receiver, the second optoelectronic receiver carries out opto-electronic conversion, electric signal after conversion obtains the second electric signal after sqrt through driving root device, the q% output light of the second fiber coupler passes through wavelength division multiplexer successively, Wave decomposing multiplexer, arrive the 3rd optoelectronic receiver, the 3rd optoelectronic receiver carries out opto-electronic conversion, produce the first electric signal, the second electric signal and first signal are made to division arithmetic, obtain output voltage signal, the second described optical fiber refers to the optical fiber connecting between wavelength division multiplexer and Wave decomposing multiplexer.
Further, described jitter elimination processing procedure is: from the q% output light of the second fiber coupler output, after the 4th optoelectronic receiver conversion, produce transducing signal, pass through direct current respectively and exchange separation module, divider, amplifier, producing 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, tool of the present invention has the following advantages:
(1) this equipment adopts super low-power consumption fast tunable optical attenuator, can effectively reduce high pressure and once hold power demands.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 as energy supply light, effectively reduce costs, adopt telecommunication optical fiber, photodiode (Photo Diode) array of existing maturation simultaneously, reliability is high, good stability, simple in structure, cost is low.Utilize electro-optical feedback control circuit to reduce the drift of optical attenuation constant, the error that the drift of light source light power and optical fiber disturbance bring, solves the problems such as non-linear, the light source shake of fast tunable optical attenuator and optical fiber disturbance.Utilize wavelength-division multiplex technique to realize the Real-Time Monitoring along path loss consumption to optical fiber simultaneously, eliminate optical fiber along the interference of path loss consumption, improve the precision and stability of equipment.Whole system is used pure mimic channel, has saved digital circuit, has simplified circuit design, has reduced cost.
(2) disturbance of the luminous power of light source shake, optical fiber also can make luminous power non-constant, causes the Output optical power of fast tunable optical attenuator to become nonlinear relationship with primary current.In order to solve the problem of the non-linear and light source shake of optical attenuation constant, improve the measuring precision, the error that the disturbance that the present invention adopts electro-optical feedback control module to reduce the drift of optical attenuation constant, the shake of light source and optical fiber brings.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 electric signal through the first optoelectronic receiver, return to the negative phase end of differential amplification module, it is poor that the primary current transducing signal producing with primary current sensor is done, by integration, integrating circuit, carry out regulating and controlling again, produce the drive end that new driving voltage is input to fast tunable optical attenuator.Such design can feed back to the disturbance of the shake of the variation of optical attenuation constant, light source and optical fiber the drive end of fast tunable optical attenuator in time.When optical attenuation constant, sensing light source luminous power or fibre loss coefficient change, can dynamically regulate by electro-optical feedback control module the driving signal of adjustable optical attenuator, thereby assurance optical attenuation multiple and primary current are linear.
(3) compensated optical fiber perturbation error, the accuracy of raising system.The present invention adopts wavelength-division multiplex technique (WDM) to realize the monitoring to light path loss along the line, in the 3rd optoelectronic receiver by voltage signal proportional to luminous power carried out to multiplication, division algorithm is processed, compensated optical fiber perturbation error, the accuracy of raising system.The present invention also can adopt the separated compensation method of alternating current-direct current to realize the monitoring to light path loss along the line, the signal of the 4th optoelectronic receiver is processed to compensated optical fiber perturbation error, the accuracy of raising system.
Accompanying drawing explanation
Fig. 1 is the first structural representation of current transformer equipment of the present invention.
Fig. 2 is the second structural representation of current transformer equipment of the present invention.
Fig. 3 is the structural representation of self energizing module in the present invention.
Fig. 4 is the structural representation of difference block in electro-optical feedback control module in the present invention.
Fig. 5 is the circuit diagram of difference block in electro-optical feedback control module in the present invention.
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.
In figure, have: sensing light source 1, fast tunable optical attenuator 2, the second fiber coupler 3, wavelength division multiplexer 4, Wave decomposing multiplexer 5, the second optoelectronic receiver 6, the 3rd optoelectronic receiver 7, optical circulator 8, monitoring light source 9, differential amplification module 10, primary current sensor 11, the first optoelectronic receiver 13, fiber reflector 14, the first fiber coupler 15, beam splitter 16, photodiode array 17, difference channel 18, ratio amplifying circuit 19, integrating circuit 20, differentiating circuit 21, the 4th optoelectronic receiver 22, AC/DC separation module 23, divider 24, amplifier 25, output voltage 26, drive root device 27.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.
As shown in Figure 1, a kind of current transformer equipment with self energizing low-power consumption of the present invention, comprising: the second fiber coupler 3 that the first fiber coupler 15, the splitting ratio that sensing light source 1, fast tunable optical attenuator 2, splitting ratio are m:n is p:q, self energizing module, electro-optical feedback control circuit, primary current sensor 11 and optical fiber shake monitoring modular.Sensing light source 1 output terminal is connected with the input end of the first fiber coupler 15, an output terminal of the first fiber coupler 15 is connected with self energizing module, another output terminal of the first fiber coupler 15 is connected with the light input end of fast light decay 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 is connected with the second fiber coupler 3 input ends, an output terminal of the second fiber coupler 3 is connected with optical fiber shake monitoring modular, another output terminal of the 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, is the energy supply of electro-optical feedback control circuit.M+n=100, and m >=1, n >=1.For example, m=99, n=1.P+q=100, and p >=1, q >=1, for example, p=20, q=80.M, n, p, q are positive integer.
As shown in Figure 3, self energizing module comprises beam splitter 16 and photodiode array 17, and beam splitter 16 has an input end and N output terminal, is 1*N beam splitter.Photodiode array 17 is in series by N photodiode, the input end of beam splitter 16 is as the input end of self energizing module, photodiode array (is called for short in literary composition: PD array) 17 output terminal is as the output terminal from functional module, the input end of beam splitter 16 is connected with an output terminal of the first fiber coupler 15, the output terminal of 1*N beam splitter 16 is connected with the input end of photodiode array 17, and an output terminal of beam splitter 16 is connected with a photodiode in photodiode array 17, the output terminal of photodiode array 17 is connected with electro-optical feedback control circuit, for energy supply.N is more than or equal to 2 integer.
The sense light of the m% of the first fiber coupler 15 that is m:n by splitting ratio, through 1*N beam splitter 16, is divided into N bundle light, is connected respectively with photodiode array 17, and N photodiode is connected into photodiode array 17, forms self energizing module.
Electro-optical feedback control circuit comprises differential amplification module 10 and the first optoelectronic receiver 13, the positive terminal of the input end of the first optoelectronic receiver 13, differential amplification module 10 is as the input end of electro-optical feedback control circuit, differential amplification module 10 output terminals are as the output terminal of electro-optical feedback control circuit, the input end of the first photoreceiver 13 is connected with an optical output port of the second fiber coupler 3, the output terminal 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 output terminal of differential amplification module 10 is connected with the drive end of fast tunable optical attenuator 2, for driving fast tunable optical attenuator 2.
With reference to figure 4, in electro-optical feedback control module, 10 concrete operations of differential amplification module are as follows: the output terminal of the first optoelectronic receiver 13 is connected with the negative phase end of difference channel 18, and the output terminal of primary current sensor 11 is connected with the positive terminal of difference channel 18.The differential signal obtaining thus produces and drives signal via ratio amplifying circuit 19, integrating circuit 20, differentiating circuit 21 again, be input to the drive end of fast tunable optical attenuator 2, the driving voltage of dynamic adjustments fast tunable optical attenuator 2, the optical attenuation constant that reduces fast tunable optical attenuator 2 changes the error of bringing.
With reference to Fig. 4 and Fig. 5, the signal producing by the first optoelectronic receiver 13 is the 3rd electric signal.Differential amplification module 10 is comprised of differential amplifier circuit and integral differential circuit, and wherein, differential amplifier circuit comprises difference channel 18 and ratio amplifying circuit 19, and integral differential circuit comprises integrating circuit 20 and differentiating circuit 21.Differential amplifier circuit is comprised of the first operational amplifier A 1, the first resistance R 1, the second resistance R 2, the three resistance R 3, the four resistance R 4.One end of the first resistance R 1 is as the first input end of differential amplifier circuit, and one end of the 3rd resistance R 3 is as the second input end of differential amplifier circuit, and the output terminal of the first operational amplifier A 1 is as the output terminal of differential amplifier circuit.The other end of the first resistance R 1 is connected with second resistance R 2 one end with the first operational amplifier A 1 normal phase input end, the other end ground connection of the second resistance R 2, the other end of the 3rd resistance R 3 is connected with the 4th resistance R 4 one end with the first operational amplifier A 1 negative-phase input, and the other end of the 4th resistance R 4 is connected with the output terminal of the first operational amplifier A 1.Integral differential circuit is comprised of the 5th resistance R 5, the six resistance R 6, the seven resistance R 7, the eight resistance R 8, the first capacitor C 1 and the second operational amplifier A 2.One end of the 5th resistance R 5 is as integral differential circuit input end, and the second operational amplifier A 2 output terminals are as integral differential circuit output terminal.The other end of the 5th resistance R 5 is connected with one end of the first capacitor C 1 with the normal phase input end of the second operational amplifier A 2, one end of the 7th resistance R 7, the other end of the 7th resistance R 7 is connected with the output terminal of the second operational amplifier A 2, the other end of the first capacitor C 1 is connected with one end of the 8th resistance R 8, the other end of the 8th resistance R 8 is connected with the output terminal of the second operational amplifier A 2, one end of the 6th resistance R 6 is connected with the negative-phase input of the second operational amplifier A 2, the other end ground connection of the 6th resistance R 6.Primary current transducing signal is connected with one end of the first resistance R 1, and the 3rd electric signal is connected with one end of the 3rd resistance R 3, and differential amplifier circuit output terminal is connected with integral differential circuit input end, and the output terminal of integral differential circuit is connected with driving signal.In difference block, adopt the first operational amplifier A 1 to form differential amplifier circuit, primary current transducing signal and the 3rd electric signal are done to poor and ratio amplification.Adopt the second operational amplifier A 2, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the first capacitor C 1 to form integral differential circuit, to differential amplifier circuit output signal carry out integration, differentiating obtains driving signal.
In this application, optical fiber is shaken preferably two kinds of structures of monitoring modular.
The first structure: as shown in Fig. 1 and Fig. 6, optical fiber shake monitoring modular comprises wavelength division multiplexer 4, fiber reflector 14, Wave decomposing multiplexer 5, optical circulator 8, monitoring light source 9, the second optoelectronic receiver 6, the 3rd optoelectronic receiver 7, divider 24 and Kai Gen device 27, an input end of wavelength division multiplexer 4 is as the input end of optical fiber shake monitoring modular, the output terminal of divider 24 is as the output terminal of optical fiber shake monitoring modular, another input end of wavelength division multiplexer 4 is connected with fiber reflector 14, for transmission of monitoring light, the output terminal of wavelength division multiplexer 4 is connected with the input end of Wave decomposing multiplexer 5, an output terminal of Wave decomposing multiplexer 5 is connected with the input end of the 3rd optoelectronic receiver 7, another output terminal of Wave decomposing multiplexer 5 is connected with an input end of optical circulator 8, another input end of optical circulator 8 is connected with monitoring light source 9, the output terminal of optical circulator 8 is connected with the input end of the second optoelectronic receiver 6, the output terminal of the second optoelectronic receiver 6 is connected with the input end of driving root device 27, open the output terminal of root device 27 and an input end of divider 24 is connected, another input end of divider 24 is connected with the 3rd optoelectronic receiver 7 output terminals.Optical circulator 8 is for switching the monitoring light of monitoring light source 9 generations and the output light of Wave decomposing multiplexer 5.
The second structure: as shown in Figure 2 and Figure 7, optical fiber shake monitoring modular comprises the 4th optoelectronic receiver 22, direct current with exchange separation module and (in literary composition, be called for short: AC/DC separation module) 23, divider 24, amplifier 25, the input end of the 4th optoelectronic receiver 22 is as the input end of optical fiber shake monitoring modular, the output terminal of amplifier 25 is as the output terminal of optical fiber shake monitoring modular, the output terminal of the 4th optoelectronic receiver 22 is connected with the input end of AC/DC separation module 23, two output terminals of AC/DC separation module 23 are connected with two input ends of divider 24 respectively, the output terminal of divider 24 is connected with the input end of amplifier 25.
The bus current detection method of above-mentioned current transformer equipment, comprise following process: utilize sensing light source 1 to produce sense light, after the first fiber coupler 15 that sense light is m:n through splitting ratio, be divided into two parts, wherein, m% sense light inputs in photodiode array 17 after 1*N beam splitter 16, to the energy supply of electro-optical feedback control module, n% sense light produces the light signal after decay after fast tunable optical attenuator 2, utilize the second fiber coupler 3 to gather the output optical signal of fast tunable optical attenuator 2, the output optical signal of p% is carried out to non-linear correction processing, reduce the interference that the first optical fiber shake and the shake of sensing light source bring, the electrooptical modulation that correction fast light attenuator 2 brings is non-linear, simultaneously, output light to q% carries out jitter elimination processing, reduce the interference that the second optical fiber shake brings, the first described optical fiber refers to the optical fiber being connected between sensing light source 1 and the first fiber coupler 15, the 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 light signal of the p% of the second fiber coupler 3 outputs converts electric signal to through the first optoelectronic receiver 13; Primary current transducing signal and the electric signal after the first optoelectronic receiver 13 conversions are carried out to differential amplification computing, produce new driving signal, be used for driving fast tunable optical attenuator 2, the non-linear correction of electrooptical modulation that fast tunable optical attenuator 2 is brought reduced the interference that the first optical fiber shake and the shake of sensing light source bring simultaneously.
When optical fiber shake monitoring modular is selected 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 passes through optical circulator 8 successively, Wave decomposing multiplexer 5 and wavelength division multiplexer 4, arrive fiber reflector 14, fiber reflector 14 produces reflected light, this reflected light passes through wavelength division multiplexer 4 successively, Wave decomposing multiplexer 5, optical circulator 8, arrive the second optoelectronic receiver 6, the second optoelectronic receiver 6 carries out opto-electronic conversion, electric signal after conversion obtains the second electric signal after sqrt through driving root device 27, the q% output light of the second fiber coupler 3 passes through wavelength division multiplexer 4 successively, Wave decomposing multiplexer 5, arrive the 3rd optoelectronic receiver 7, the 3rd optoelectronic receiver 7 carries out opto-electronic conversion, produce the first electric signal, the second electric signal and first signal are made to division arithmetic, obtain output voltage signal 26.The second optoelectronic receiver 6 is the light that receives 1570nm, monitors the light of light source 9.The 3rd optoelectronic receiver 7 is the light that receives 1550nm, the i.e. light of sensing light source 1.In this structure, the second optical fiber refers to the optical fiber connecting between wavelength division multiplexer 4 and Wave decomposing multiplexer 5.
When optical fiber shake monitoring modular is selected the second structure, jitter elimination processing procedure in above-mentioned bus current detection method is: from the q% output light of the second fiber coupler 3 outputs, after the 4th optoelectronic receiver 22 conversions, produce transducing signal, pass through respectively 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 equipment 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, be divided into N road light, input to photodiode array 17 for energy supply.N% sense light produces the light signal after decay after fast tunable optical attenuator 2.Light through fast tunable optical attenuator 2 transfers in the second fiber coupler 3, light is divided into two-way, the light of one road p% is converted to electric signal through Optical Fiber Transmission to the first optoelectronic receiver 13, this electric signal transmission is to the negative phase end of differential amplification module 10, with the primary current transducing signal of primary current sensor 11 do poor, obtain signal as driving signal, input to the drive end of fast tunable optical attenuator 2.Can reduce like this error that the optical path loss of instability due to sensing light source 1, the first optical fiber brings.Simultaneously, when the attenuation constant generation nonlinearities change of fast tunable optical attenuator 2, can the optical attenuation constant of variation be fed back to by this structure to the drive end of fast tunable optical attenuator 2, utilize the variation of driving voltage to make system recover line balancing state, reduce the non-linear error of bringing of optical attenuation constant; The light of another road q% through the second Optical Fiber Transmission to low pressure end.Optical path loss for connecting the second optical fiber of high-pressure side and low pressure end, mainly adopts wavelength-division multiplex technique compensation technique separated with alternating current-direct current to eliminate the interference of light path loss along the line, and concrete scheme is as follows:
Scheme one
As Fig. 4, monitoring light source 9(1570nm) process Optical Fiber Transmission is to optical circulator 8, optical circulator 8 passes through Optical Fiber Transmission to Wave decomposing multiplexer 5 by light, pass through again Optical Fiber Transmission to wavelength division multiplexer 4, a window of wavelength division multiplexer 4 transmits light to fiber reflector 14, through the reflected light of fiber reflector 14 and the q% of the second fiber coupler 3 output light, by wavelength division multiplexer 4, be coupled into same optical fiber, through a segment distance transmission, utilize Wave decomposing multiplexer 5 that light signal is divided into the reflected light signal of fiber reflector 14 and the q% output optical signal of the second fiber coupler 3.Wherein, the q% output optical signal of the second fiber coupler 3, through Optical Fiber Transmission to the three photelectric receivers 7, is converted to the first electric signal V by the 3rd photelectric receiver 7
1, the reflected light signal of fiber reflector 14 is through Optical Fiber Transmission to optical circulator 8, and optical circulator 8 through Optical Fiber Transmission to the second optoelectronic receiver 6, is converted to second electric signal V by the second optoelectronic receiver 6 by light
2, to V
1, V
2carry out algorithm process, reduce and be connected to optical fiber b dissipation constant α along the line between wavelength division multiplexer 4 and Wave decomposing multiplexer 5
1the interference bringing.Algorithm is as follows: establishing optical fiber b dissipation constant along the line is α
1, the q% luminous power of the second fiber coupler 3 outputs is P
1, the luminous power of monitoring light source 9 is P
2, the light decay rate of fiber reflector is α, luminous power and magnitude of voltage proportionality constant are β, the first electric signal V of the 3rd photelectric receiver 7 conversions
1=P
1α
1β, the second electric signal V of the second optoelectronic receiver 6 conversions
2=P
2α α
1 2β, V
2through driving root device 27, obtain
the input end of divider 24 is divided into other V
1,
both are divided by and can obtain
the output of divider is multiplied by
can obtain and transducing signal under the noiseless state of the proportional ideal of bus current signal.
Scheme two
As Fig. 5, the q% of the second fiber coupler 3 output light is converted to electric signal by the 4th optoelectronic receiver 22, and this electric signal is divided into interchange, DC component by AC/DC separation module 23, transfers to respectively the input end of divider 24.Divider 24 is by AC compounent divided by DC component, and acquired results transfers to the input end of amplifier 25, and the output terminal of amplifier 25 is optical fiber and shakes revised signal.Algorithmic procedure is as follows: establishing the second optical fiber c dissipation constant along the line connecting between the second fiber coupler 3 and optical fiber shake monitoring modular is α
2, the enlargement factor of amplifier 25 is A, the q% luminous power of the second fiber coupler 3 outputs is P
3, wherein constant optical power is P
4, the power being superimposed upon in constant optical power is P
5so, P
3=P
4+ P
5, luminous power and magnitude of voltage proportionality constant are β, the electric signal V of the 4th optoelectronic receiver 22 conversions
4=P
3α
2β=P
4α
2β+P
5the AC signal that α 2 β process through AC/DC separation module 23 is V
5=P
5α
2β, direct current signal is V
6=P
4α
2β, V
5divided by V
6can eliminate optical fiber c loss α along the line
2impact, formula is V
5/ V
6=P
5α
2β/(P
4α
2β)=P
5/ P
4, amplifier 25 is output as A*V
5/ V
6=A*P
5/ P
4, due to P
4constant, so amplifier 25 outputs are proportional to P
5.In bus current detection method of the present invention, by sensing light source 1, produce sense light, through the first fiber coupler 15, the sense light of m% is for self energizing module, the sense light of n% is through fast tunable optical attenuator 2(FVOA, fastvariable optical attenuator) the rear light signal producing after decay.Light signal after described decay is processed through two schemes, reduces the interference that optical fiber shake brings, and produces output signal after opto-electronic conversion.Simultaneously, utilize primary current sensor 11 to obtain the bus current signal on hi-line, by the feedback electric signal with fast tunable optical attenuator 2 output signals, undertaken after difference, amplification, integration, differential, produce new driving signal for driving fast tunable optical attenuator 2.
Claims (9)
1. a current transformer equipment with self energizing low-power consumption, it is characterized in that, this current transformer equipment comprises: sensing light source (1), fast tunable optical attenuator (2), splitting ratio is the first fiber coupler (15) of m:n, splitting ratio is the 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, sensing light source (1) output terminal is connected with the input end of the first fiber coupler (15), an output terminal of the first fiber coupler (15) is connected with self energizing module, another output terminal of the first fiber coupler (15) is connected with the light input end of fast tunable 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) is connected with the second fiber coupler (3) input end, an output terminal of the second fiber coupler (3) is connected with optical fiber shake monitoring modular, another output terminal of the 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, is the energy supply of electro-optical feedback control circuit, m+n=100, and m >=1, n >=1, p+q=100, and p >=1, q >=1.
2. according to the current transformer equipment with self energizing low-power consumption claimed in claim 1, it is characterized in that, described self energizing module comprises beam splitter (16) and photodiode array (17), beam splitter (16) has an input end and N output terminal, photodiode array (17) is in series by N photodiode, the input end of beam splitter (16) is as the input end of self energizing module, the output terminal of photodiode array (17) is as the output terminal from functional module, the input end of beam splitter (16) is connected with an output terminal of the first fiber coupler (15), the output terminal of beam splitter (16) is connected with the input end of photodiode array (17), and an output terminal of beam splitter (16) is connected with a photodiode in photodiode array (17), the output terminal of photodiode array (17) is connected with electro-optical feedback control circuit, for energy supply, N is more than or equal to 2 integer.
3. according to the current transformer equipment with self energizing low-power consumption claimed in claim 2, it is characterized in that, described electro-optical feedback control circuit comprises differential amplification module (10) and the first optoelectronic receiver (13), the input end of the first optoelectronic receiver (13), the positive terminal of differential amplification module (10) is as the input end of electro-optical feedback control circuit, differential amplification module (10) output terminal is as the output terminal of electro-optical feedback control circuit, the input end of the first photoreceiver (13) is connected with an optical output port of the second fiber coupler (3), the output terminal 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 output terminal of differential amplification module (10) is connected with the drive end of fast tunable optical attenuator (2), for driving fast tunable optical attenuator (2).
4. according to claim 1, the current transformer equipment with self energizing low-power consumption described in 2 or 3, it is characterized in that, described optical fiber shake monitoring modular comprises wavelength division multiplexer (4), fiber reflector (14), Wave decomposing multiplexer (5), optical circulator (8), monitoring light source (9), the second optoelectronic receiver (6), the 3rd optoelectronic receiver (7), divider (24) and drive root device (27), an input end of wavelength division multiplexer (4) is as the input end of optical fiber shake monitoring modular, the output terminal of divider (24) is as the output terminal of optical fiber shake monitoring modular, another input end of wavelength division multiplexer (4) is connected with fiber reflector (14), for transmission of monitoring light, the output terminal of wavelength division multiplexer (4) is connected with the input end of Wave decomposing multiplexer (5), an output terminal of Wave decomposing multiplexer (5) is connected with the input end of the 3rd optoelectronic receiver (7), another output terminal of Wave decomposing multiplexer (5) is connected with an input end of optical circulator (8), another input end of optical circulator (8) is connected with monitoring light source (9), the output terminal of optical circulator (8) is connected with the input end of the second optoelectronic receiver (6), the output terminal of the second optoelectronic receiver (6) is connected with the input end of driving root device (27), open the output terminal of root device (27) and an input end of divider (24) is connected, another input end of divider (24) is connected with the 3rd optoelectronic receiver (7) output terminal.
5. according to claim 1, the current transformer equipment with self energizing low-power consumption described in 2 or 3, it is characterized in that, described optical fiber shake monitoring modular comprises the 4th optoelectronic receiver (22), direct current with exchange separation module (23), divider (24), amplifier (25), the input end of the 4th optoelectronic receiver (22) is as the input end of optical fiber shake monitoring modular, the output terminal of amplifier (25) is as the output terminal of optical fiber shake monitoring modular, the output terminal of the 4th optoelectronic receiver (22) is connected with the input end that exchanges separation module (23) with direct current, direct current is connected with two input ends of divider (24) respectively with two output terminals that exchange separation module (23), the output terminal of divider (24) is connected with the input end of amplifier (25).
6. a bus current detection method of utilizing the current transformer equipment described in claim 1, it is characterized in that, this detection method comprises following process: utilize sensing light source (1) to produce sense light, after the first fiber coupler (15) that sense light is m:n through splitting ratio, be divided into two parts, wherein, m% sense light inputs in photodiode array (17) after beam splitter (16), to the energy supply of electro-optical feedback control circuit, n% sense light produces the light signal after decay after fast tunable optical attenuator (2), utilize the second fiber coupler (3) to gather the output optical signal of fast tunable optical attenuator (2), the output optical signal of p% is carried out to non-linear correction processing, reduce the interference that the first optical fiber shake and the shake of sensing light source bring, the electrooptical modulation that correction fast tunable optical attenuator (2) brings is non-linear, simultaneously, output light to q% carries out jitter elimination processing, reduce the interference that the second optical fiber shake brings, the first described optical fiber refers to the optical fiber being connected between sensing light source (1) and the first fiber coupler (15), the 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).
7. according to the bus current detection method of current transformer equipment claimed in claim 6, 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 light signal of the p% of the second fiber coupler (3) output converts electric signal to through the first optoelectronic receiver (13); Primary current transducing signal and the electric signal after the first optoelectronic receiver (13) conversion are carried out to differential amplification computing, produce new driving signal, be used for driving fast tunable optical attenuator (2), the non-linear correction of electrooptical modulation that fast tunable optical attenuator (2) is brought reduced the interference that the first optical fiber shake and the shake of sensing light source bring simultaneously.
8. according to the bus current detection method of the current transformer equipment described in claim 6 or 7, it is characterized in that, described jitter elimination processing procedure is: utilize monitoring light source (9) to produce monitoring light, this monitoring light passes through optical circulator (8) successively, Wave decomposing multiplexer (5) and wavelength division multiplexer (4), arrive fiber reflector (14), fiber reflector (14) produces reflected light, this reflected light passes through wavelength division multiplexer (4) successively, Wave decomposing multiplexer (5), optical circulator (8), arrive the second optoelectronic receiver (6), the second optoelectronic receiver (6) carries out opto-electronic conversion, electric signal after conversion obtains the second electric signal after sqrt through driving root device (27), the q% output light of the second fiber coupler (3) passes through wavelength division multiplexer (4) successively, Wave decomposing multiplexer (5), arrive the 3rd optoelectronic receiver (7), the 3rd optoelectronic receiver (7) carries out opto-electronic conversion, produce the first electric signal, the second electric signal and first signal are made to division arithmetic, obtain output voltage signal (26), the second described optical fiber refers to the optical fiber connecting between wavelength division multiplexer (4) and Wave decomposing multiplexer (5).
9. according to the bus current detection method of the current transformer equipment described in claim 6 or 7, it is characterized in that, described jitter elimination processing procedure is: from the q% output light of the second fiber coupler (3) output, after the 4th optoelectronic receiver (22) conversion, produce transducing signal, pass through direct current respectively and exchange separation module (23), divider (24), amplifier (25), producing 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.
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 true CN103698571A (en) | 2014-04-02 |
| CN103698571B 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) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267239A (en) * | 2014-10-11 | 2015-01-07 | 东南大学 | Current transformer for multipath bus current detection and current detection method thereof |
| CN105021863A (en) * | 2014-04-15 | 2015-11-04 | 通用电气公司 | Systems and methods for monitoring fiber optic current sensing systems |
| CN104267239B (en) * | 2014-10-11 | 2017-01-04 | 东南大学 | Current transformer and electric current detecting method thereof for the detection of multichannel bus current |
| CN108132420A (en) * | 2017-12-08 | 2018-06-08 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of portable string mends sensor detecting device |
| CN108732405A (en) * | 2018-06-19 | 2018-11-02 | 南京工程学院 | A kind of passive optical intensity modulation type current transformer and bus current detection method |
| CN110763894A (en) * | 2018-07-27 | 2020-02-07 | 上海诺基亚贝尔股份有限公司 | Method, apparatus and computer storage medium for measurement |
| CN112583366A (en) * | 2020-12-21 | 2021-03-30 | 山东科技大学 | Photoelectrode voltage square root amplifying circuit and electric appliance |
| CN113804938A (en) * | 2021-08-16 | 2021-12-17 | 南京南瑞继保电气有限公司 | Optical current transformer and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0849600A1 (en) * | 1996-12-20 | 1998-06-24 | Mitsubishi Denki Kabushiki Kaisha | Optical current transformer |
| CN2582130Y (en) * | 2002-10-29 | 2003-10-22 | 顺德特种变压器厂 | Active optical fibre current transformer |
| CN102608557A (en) * | 2012-03-19 | 2012-07-25 | 西安交通大学 | Photoelectric current transformer with online check function |
| CN103116055A (en) * | 2013-01-29 | 2013-05-22 | 长飞光纤光缆有限公司 | All-optical-fiber current transformer system with temperature measurement function |
| CN103399193A (en) * | 2013-08-05 | 2013-11-20 | 东南大学 | Variable optical attenuator-based bus current detection method and current transformer equipment |
-
2014
- 2014-01-03 CN CN201410004034.8A patent/CN103698571B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0849600A1 (en) * | 1996-12-20 | 1998-06-24 | Mitsubishi Denki Kabushiki Kaisha | Optical current transformer |
| CN2582130Y (en) * | 2002-10-29 | 2003-10-22 | 顺德特种变压器厂 | Active optical fibre current transformer |
| CN102608557A (en) * | 2012-03-19 | 2012-07-25 | 西安交通大学 | Photoelectric current transformer with online check function |
| CN103116055A (en) * | 2013-01-29 | 2013-05-22 | 长飞光纤光缆有限公司 | All-optical-fiber current transformer system with temperature measurement function |
| CN103399193A (en) * | 2013-08-05 | 2013-11-20 | 东南大学 | Variable optical attenuator-based bus current detection method and current transformer equipment |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021863A (en) * | 2014-04-15 | 2015-11-04 | 通用电气公司 | Systems and methods for monitoring fiber optic current sensing systems |
| CN105021863B (en) * | 2014-04-15 | 2020-08-21 | 通用电气公司 | System and method for monitoring fiber optic current sensing systems |
| CN104267239A (en) * | 2014-10-11 | 2015-01-07 | 东南大学 | Current transformer for multipath bus current detection and current detection method thereof |
| CN104267239B (en) * | 2014-10-11 | 2017-01-04 | 东南大学 | Current transformer and electric current detecting method thereof for the detection of multichannel bus current |
| CN108132420A (en) * | 2017-12-08 | 2018-06-08 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of portable string mends sensor detecting device |
| CN108732405A (en) * | 2018-06-19 | 2018-11-02 | 南京工程学院 | A kind of passive optical intensity modulation type current transformer and bus current detection method |
| 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 |
| CN110763894A (en) * | 2018-07-27 | 2020-02-07 | 上海诺基亚贝尔股份有限公司 | Method, apparatus and computer storage medium for measurement |
| 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 |
| CN112583366A (en) * | 2020-12-21 | 2021-03-30 | 山东科技大学 | Photoelectrode voltage square root amplifying circuit and electric appliance |
| CN112583366B (en) * | 2020-12-21 | 2022-05-06 | 山东科技大学 | Photoelectrode voltage square root amplifying circuit and electric appliance |
| CN113804938A (en) * | 2021-08-16 | 2021-12-17 | 南京南瑞继保电气有限公司 | Optical current transformer and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103698571B (en) | 2016-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103698571A (en) | Current transformer equipment with effects of self energy supply and low consumption and bus current detecting method | |
| CN103399193B (en) | Based on bus current detection method and the current transformer arrangement of adjustable optical attenuator | |
| CN103837852B (en) | All-fiber electronic current transformer frequency characteristic test device and method of testing | |
| CN102628884A (en) | Closed-loop optical fiber current transformer | |
| CN102914679B (en) | Passive optical voltage transformer based on electrooptical effect | |
| CN106645911A (en) | All-fiber current transformer for open loop independent double-sampling circuit based on single light path | |
| CN202649279U (en) | Closed-loop optical fiber current transformer | |
| CN111277325B (en) | Instantaneous frequency measurement method and system with adjustable measurement range based on polarization modulator | |
| CN103575511B (en) | The measurement apparatus of a kind of relative intensity noise of laser and method | |
| CN106443126B (en) | A kind of method and apparatus measuring electro-optic crystal half-wave voltage | |
| CN102914423A (en) | Measuring device and method for sag frequency of dispersion optical fiber | |
| CN103163351B (en) | A kind of optical voltage sensor of three-phase common light source | |
| CN105068033B (en) | The calibration equipment and its method of a kind of The Rogowski Optical Current Transformer | |
| RU149253U1 (en) | MAGNETOOPTIC AC MEASURING TRANSMITTER | |
| CN103245817B (en) | A kind of method of measuring voltage and voltage sensor | |
| CN105281829B (en) | Light vector Network Analyzer device based on Sagnac-ring | |
| CN206460095U (en) | The all-fiber current transformator in the independent double sampled loop of the open loop based on single light path | |
| CN106199125B (en) | A kind of novel all-fiber current transformator and its modulation-demo-demodulation method | |
| CN104515932B (en) | A kind of line current fault rapid detecting method and device | |
| CN105717403A (en) | Insulation fault monitoring system for cell array | |
| CN205262957U (en) | Gas concentration detection system based on programmable amplifier | |
| CN103869134A (en) | Current transformer and bus current detecting method based on neural network | |
| Gallo et al. | Electronic instrument transducer for MV networks with fiber optic insulation | |
| Wei et al. | A hybrid electro-optic current transducer using a photodiode-based primary supply | |
| EP2510365B1 (en) | Magneto optical current transducer with improved outage performance |
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 |