CN103424607B - A kind of optical current sensor and high frequency testing system - Google Patents
A kind of optical current sensor and high frequency testing system Download PDFInfo
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- CN103424607B CN103424607B CN201310319433.9A CN201310319433A CN103424607B CN 103424607 B CN103424607 B CN 103424607B CN 201310319433 A CN201310319433 A CN 201310319433A CN 103424607 B CN103424607 B CN 103424607B
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Abstract
The present invention relates to a kind of optical current sensor and high frequency testing system, this optical current sensor comprises optical sensor unit, polarization maintaining optical fibre, insulator and demodulation module, optical sensor unit, polarization maintaining optical fibre are connected successively with demodulation module, optical sensor unit is supported by insulator, and polarization maintaining optical fibre is positioned at the inner chamber of insulator; Optical sensor unit comprises the first sensing fiber ring and the second sensing fiber ring and all adopts the first wave plate of nonmetallic materials, the first catoptron, the second wave plate, the second catoptron and support, and the direction of current of the first sensing fiber ring and the induction of the second sensing fiber ring is contrary; Demodulation module exports two-route wire polarized light and to receive to optical sensor unit and by polarization maintaining optical fibre to respond to based on difference after the two-way returned carries the linearly polarized light of tested current information through polarization maintaining optical fibre and carry out calculation process and obtain tested electric current.This optical current sensor can complete the measurement to high-frequency signal, improves accuracy of measurement and reliability.
Description
Technical field
The present invention relates to a kind of electrical equipment technical field, particularly a kind of optical current sensor and adopt the high frequency testing system of this optical current sensor.
Background technology
Current sensor is the visual plant of relay protection and electric energy metrical in electric system, is used for measuring the size of current in transmission, and the size of current measured is sent to surveying instrument and protective relaying device.Safety, the stable operation of its long-time stability, reliability, security and electric system are closely related.Use more current sensor mainly based on electromagnetic induction principle in electric system at present, meeting mutual inductive energy from primary current, can also to satisfy the demands when the not too high electric current of voltage is not too large in low frequency situation (as 50Hz) based on traditional current sensor of this kind of principle, when under the electric current environment at hundreds of kilovolts of high voltages and the training of a little Wan An, traditional current sensor often occurs that insulativity punctures not, the malfunction by electromagnetic interference (EMI) is serious, so there is the potential safety hazard such as short circuit, blast.Due to the skin effect of high-frequency current and around it electromagnetic field of high frequency scattering interference larger, the performance of traditional electric current device conventional in electric system can not meet the requirement of insulating requirements and electromagnetism interference, therefore in high frequency testing under high-voltage great-current condition, this type of active sensor cannot use especially.From once holding the energy of induction to make equipment burnout, severe electromagnetic environment is also enough to make equipment malfunction.An energy between high voltage bus with current sensor is coupled mutually and also may has influence on a bus current transmission security.
Optical current sensor based on Faraday magnetooptical effect is mainly used in electric system low frequency signal at present and measures, because its bracing frame near the optical sensor unit of primary side uses aluminum alloy materials usually, therefore also can there is the problem of radiation interference impact when surveying high-frequency signal.And at present electric system normal optical current sensor can vibrated etc. the impact of factor, there is common-mode noise, cause accuracy and the reliability reduction of high frequency testing; In addition, optical current sensor for low frequency measurement is directly used in when surveying high-frequency signal and equal sample frequency down-sampling cycle can be made to tail off, signal to noise ratio (S/N ratio) reduces, cause the accuracy of high frequency testing to reduce further, therefore electric system normal optical current sensor can not meet the requirement of high frequency testing at present.
High frequency testing under high-voltage great-current condition, does not also have shaping complete equipment at present.
Summary of the invention
The present invention is directed to the problem that traditional current sensor and current electric system normal optical current sensor are not all suitable for the high frequency testing under high-voltage great-current condition, a kind of novel optical current sensor is provided, the measurement to high-frequency signal can be completed, improve accuracy of measurement and reliability.The invention still further relates to a kind of high frequency testing system adopting above-mentioned optical current sensor.
Technical scheme of the present invention is as follows:
A kind of optical current sensor, it is characterized in that, comprise optical sensor unit, polarization maintaining optical fibre, insulator and demodulation module, described optical sensor unit, polarization maintaining optical fibre are connected successively with demodulation module, described optical sensor unit is supported by insulator, and described polarization maintaining optical fibre is positioned at the inner chamber of insulator, described optical sensor unit comprises the first sensing fiber ring and the second sensing fiber ring and all adopts the first wave plate of nonmetallic materials, first catoptron, second wave plate, second catoptron and support, described polarization maintaining optical fibre comprises the first polarization maintaining optical fibre and the second polarization maintaining optical fibre, the end of described first sensing fiber ring connects the first catoptron, the other end of the first sensing fiber ring connects the first polarization maintaining optical fibre by the first wave plate, the end of described second sensing fiber ring connects the second catoptron, the other end of the second sensing fiber ring connects the second polarization maintaining optical fibre by the second wave plate, described support is the closed hoop structure that two or more arc parts with draw-in groove are detachably formed, the draw-in groove of described each arc part is combined to form closed hoop, described first sensing fiber ring and the second sensing fiber ring are all wound in draw-in groove and coiling direction is contrary, the direction of current of described first sensing fiber ring and the induction of the second sensing fiber ring is contrary, described demodulation module exports two-route wire polarized light and to receive to optical sensor unit and by polarization maintaining optical fibre to respond to based on difference after the two-way returned carries the linearly polarized light of tested current information through polarization maintaining optical fibre and carry out calculation process and obtain tested electric current.
Described demodulation module comprises light source, coupling mechanism, first phase modulator, second phase modulator, first detector, second detector and differential processing module, described coupling mechanism respectively with light source, first phase modulator, second phase modulator is connected with the second detector with the first detector, described first phase modulator is connected with the first polarization maintaining optical fibre, described second phase modulator is connected with the second polarization maintaining optical fibre, described first detector is all connected with differential processing module with the second detector, described differential processing module is connected with second phase modulator with first phase modulator respectively.
Described differential processing module comprises the first AD converter, second AD converter, 3rd AD converter, 4th AD converter, first calculation process module, first D/A converter, second calculation process module, second D/A converter and compensating module, described first detector is connected with the second AD converter with the first AD converter respectively, described second detector is connected with the 4th AD converter with the 3rd AD converter respectively, described first AD converter is all connected with the first calculation process module with the 3rd AD converter, described second AD converter is all connected with the second calculation process module with the 4th AD converter, described first calculation process module is connected with first phase modulator by the first D/A converter, described second calculation process module is connected with second phase modulator by the second D/A converter, described first calculation process module is all connected with compensating module with the second calculation process module.
Described coupling mechanism comprises the first coupling mechanism, the second coupling mechanism and the 3rd coupling mechanism, described first coupling mechanism is connected with the 3rd coupling mechanism with light source, the second coupling mechanism respectively, described second coupling mechanism is connected with the first detector with first phase modulator respectively, and described 3rd coupling mechanism is connected with the second detector with second phase modulator respectively.
The first sensing fiber ring in described optical sensor unit is identical with the second sensing fiber ring coiling number of turns, and described first wave plate overlaps with the line outlet position of the first catoptron at support, and described second wave plate overlaps with the line outlet position of the second catoptron at support.
Described draw-in groove is two closed hoops that the size that arranges at the both sides end surface symmetric of support is identical, or described draw-in groove is two closed hoops be arranged side by side along the external annular surface of support, to hold the first sensing fiber ring and the second sensing fiber ring respectively.
Described optical sensor unit also comprises multiple nonmetallic baffle plate first sensing fiber ring and the second sensing fiber ring are limited in draw-in groove, and the quantity of described baffle plate is 4 to 16.
Described optical sensor unit also comprises the nonmetallic cover plate covering draw-in groove, and be wound around the first sensor fibre and the second sensor fibre in draw-in groove after, described cover plate is fixed by nonmetal screw.
A kind of high frequency testing system, it is characterized in that, adopt above-mentioned optical current sensor, also comprise interconnective fiber optical transceiver and host computer, described fiber optical transceiver is connected with the demodulation module in optical current sensor.
Comprise two or more optical current sensor, also comprise digital signal processor, described fiber optical transceiver is connected with the demodulation module in optical current sensor by digital signal processor, described digital signal processor receives the tested current data of the demodulation module in each optical current sensor, pass to host computer by fiber optical transceiver after carrying out synchronous packing process, described host computer carries out statistical calculation process to the tested current data of multichannel.
Technique effect of the present invention is as follows:
Optical current sensor provided by the invention, comprise optical sensor unit, polarization maintaining optical fibre, insulator and demodulation module, demodulation module exports two-route wire polarized light through polarization maintaining optical fibre to optical sensor unit, optical sensor unit adopts two good sensing fiber rings of insulating property to respond to respectively high-frequency current signal to be measured, according to Faraday magnetooptical effect, light phase in the toroidal magnetic field modulated optical sensing element that on high voltage bus or electrode, high-frequency current is formed, thus change the polarization angle of incident ray polarized light, form the linearly polarized light that two-way carries tested current information respectively, and the tested direction of current carried is contrary, this two-route wire polarized light turns back to demodulation module respectively through after the first catoptron of the first sensing fiber ring end in optical sensor unit and the second catoptron reflection of the second sensing fiber ring end by two polarization maintaining optical fibres, because two sensing fiber ring coiling directions are contrary, the direction of current of its induction is contrary, but carry identical common-mode noise, namely optical sensor unit adopts difference induction, demodulation module carries out calculation process based on difference induction can directly obtain tested electric current, data processing can reduce and even substantially eliminate common-mode noise, reduce the impact of the factors such as vibration, complete high frequency testing.Optical current sensor of the present invention is based on Faraday magnetooptical effect, do not need to get energy from once holding, near the optical sensor unit generation magneto-optic work of once holding is the first sensing fiber ring and the second sensing fiber ring, relative electric signal is not easy to be subject to electromagnetic interference (EMI), more can not cause interference to once holding, avoid the existing conventional current sensors based on electromagnetic induction principle seriously to cause occurring short circuit owing to being subject to electromagnetic interference (EMI), the problem of the potential safety hazards such as blast, it also avoid current electric system normal optical current sensor owing to there is radiation interference impact and not being suitable for the problem of high frequency testing due to the impact of factors such as being vibrated simultaneously, optical current sensor of the present invention improves measuring accuracy, meet the requirement of double copies simultaneously, and light path redundancy is provided, strengthen the reliability of high frequency testing.In addition, owing to being provided with two cover sensing fiber rings and connected wave plate and catoptron in Fibre Optical Sensor parts, two paths of signals is formed, can also inspection mutually between this two paths of signals, improve the unfailing performance of this optical current sensor further.
In addition, due to the radiation effect of high-frequency signal, in optical sensor unit, except the first sensing fiber ring and the second sensing fiber ring are except insulating material, all the other associated mounting structure and accessory also adopt nonmetallic materials, to prevent because the high-frequency signal of the factors such as radiation to high voltage bus or electrode causes interference, improve the insulating property of optical sensor unit, avoid potential safety hazard, meet the environmental requirement of high frequency measurement under high-voltage great-current.For the situation of the high voltage bus or electrode dismounting difficulty that produce high-frequency signal, optical sensor unit is designed to the supporting structure of dismountable closed hoop, support is provided with the draw-in groove of accommodation two sensing fiber ring, this design can install optical sensor unit by opening combinations, two sensing fiber rings carry out flexible coiling respectively in opposite direction around draw-in groove at the scene, can be understood as is that two sensing fiber rings carry out flexible coiling around high voltage bus or electrode at the scene, reduce difficulty of construction, easy for installation, without the need to dismantling high voltage bus or electrode, also daily servicing is facilitated to change.Supported as optical sensor unit by insulator, the optical sensor unit of primary side is connected with the demodulation module of secondary side through insulator by polarization maintaining optical fibre, insulator is important support in optical current sensor of the present invention and the control that insulate.Optical current sensor insulating property of the present invention and electromagnetism interference is functional, measure bandwidth be particularly useful for high frequency testing, there is the advantages such as structure is simple, easy to operate, efficient, safe simultaneously.
Demodulation module is set and comprises light source, coupling mechanism, first phase modulator, second phase modulator, the first detector, the second detector and differential processing module, make that the electric signal in demodulation module also has binary channels, further backup effect can be played, can also inspection mutually, the further reliability of raising optical current sensor of the present invention in non-interfering situation between two paths of signals.
The first sensing fiber ring arranged in optical sensor unit is identical with the second sensing fiber ring coiling number of turns, equal coiling one is enclosed or multi-turn, first wave plate overlaps with the line outlet position of the first catoptron at support, second wave plate overlaps with the line outlet position of the second catoptron at support, this setting can ensure that the size of the tested high-frequency current that two paths of signals carries is identical further, the common-mode noise of carrying is consistent, by the difference induction calculation process of demodulation module, the accuracy of the tested high-frequency current obtained is improved further.
Arranging draw-in groove is at two identical closed hoops of the size of the both sides end surface symmetric setting of support, or draw-in groove is designed to two closed hoops being arranged side by side along the external annular surface of support, to hold the first sensing fiber ring and the second sensing fiber ring respectively, such first sensing fiber ring and the second sensing fiber ring can be wound around respectively in the draw-in groove of two Parallel Symmetrics, compare and be wound on same draw-in groove, sensing fiber ring is wound around respectively more convenient in two draw-in grooves, without the need to considering the problem of two sensing fiber ring Stagger-wrap, ensure that the intensity size of tested high-frequency current signal, the high frequency measurement accuracy of further raising optical current sensor.
High frequency testing system provided by the invention, adopt optical current sensor of the present invention, also comprise interconnective fiber optical transceiver and host computer, fiber optical transceiver is connected with the demodulation module in optical current sensor, the high-frequency current signal recorded passes and transfers to host computer by fiber optical transceiver by demodulation module, by host computer, the high-frequency current signal data recorded is carried out statistical calculation process.This high frequency testing system can arrange one or more optical current sensor of the present invention, when connecting multiple, that the demodulation module in each optical current sensor is all connected with digital signal processor, digital signal processor receives the tested current data of each demodulation module, carry out pulse period signal synchronously pack process after pass to host computer by fiber optical transceiver, by host computer, statistical calculation process is carried out to the tested current data of multichannel.High frequency testing system of the present invention adopts structure simple, easy to operate, efficiently, the optical current sensor of safety, avoid the problem that traditional current sensor and current electric system normal optical current sensor are not all suitable for the high frequency testing under high-voltage great-current condition, the measurement to high-frequency signal can be completed, improve accuracy of measurement and reliability, and process of one or more high-frequency current signal data recorded synchronously can being packed, outputting standard form is to host computer, extract by host computer the high-frequency current data that record and carry out statistical calculation process, can by the high-frequency current data recorded as required in real time or the requirement such as timing carry out statistical calculation process, meet the multiple demand of field of electrical equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical current sensor of the present invention.
Fig. 2 a and Fig. 2 b is the preferred structure schematic diagram of the optical sensor unit in optical current sensor of the present invention.
Fig. 3 is the preferred structure schematic diagram of optical current sensor of the present invention.
Fig. 4 is the first preferred structure schematic diagram of the demodulation module in optical current sensor of the present invention.
Fig. 5 is the second preferred structure schematic diagram of the demodulation module in optical current sensor of the present invention.
Fig. 6 is the structural representation of high frequency testing system of the present invention.
Fig. 7 is the preferred structure schematic diagram of high frequency testing system of the present invention.
In figure, each label lists as follows:
1-optical sensor unit; 2-polarization maintaining optical fibre; 3-insulator; 4-demodulation module; 5-communications optical cable; 6-data-interface line; 11-first sensing fiber ring; 12-second sensing fiber ring; 13-first catoptron; 14-second catoptron; 15-first wave plate; 16-second wave plate; 17-support; 18-draw-in groove; 19-cover plate; 21-first polarization maintaining optical fibre; 22-second polarization maintaining optical fibre.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be described.
The present invention relates to a kind of optical current sensor, for the current measurement in electric system, especially may be used for the high frequency current measurement of high-voltage great-current, as the high frequency current measurement on high voltage bus or electrode.The structure of this optical current sensor as shown in Figure 1, comprise optical sensor unit 1, polarization maintaining optical fibre 2, insulator 3 and demodulation module, wherein, optical sensor unit 1, polarization maintaining optical fibre 2 are connected successively with demodulation module, optical sensor unit 1 is supported by insulator 3, polarization maintaining optical fibre 2 is positioned at the inner chamber of insulator 3, and the lumen loading of insulator 3 has insulating medium.The material of this insulator 3 in high frequency measurement is preferably radioceramic.
Two pairs of sensing fiber rings are provided with in optical sensor unit 1, catoptron and wave plate is connected with at the two ends of each sensing fiber ring, optical sensor unit structure as shown in Figure 2 a and 2 b, comprise the first sensing fiber ring 11 and the second sensing fiber ring 12 and all adopt the first catoptron 13 of nonmetallic materials, second catoptron 14, first wave plate 15, second wave plate 16 and support 17, the end of the first sensing fiber ring 11 connects the first catoptron 13, the other end of the first sensing fiber ring 11 connects the first wave plate 15, the end of the second sensing fiber ring 12 connects the second catoptron 14, the other end of the second sensing fiber ring 12 connects the second wave plate 16.Closed hoop structure that support 17 is detachably formed for two or more arc parts with draw-in groove 18 (as support 17 can be made up of two symmetrical semi-rings), the draw-in groove 18 of each arc part is combined to form closed hoop, and Fig. 2 b is part-structure figure.First sensing fiber ring 11 and the second sensing fiber ring 12 are all wound in draw-in groove 18 and coiling direction on the contrary, and the direction of current of the first sensing fiber ring 11 and the induction of the second sensing fiber ring 12 is contrary.
First sensing fiber ring 11 and the second sensing fiber ring 12 all can distinguish the multi-turn that coiling one is enclosed or coiling is identical or different, at the central shaft of the first sensing fiber ring 11 and the second sensing fiber ring 12, tested high voltage bus or electrode are set, high-frequency current tested on high voltage bus or electrode forms toroidal magnetic field, and the first sensing fiber ring 11 and the second sensing fiber ring 12 are arranged along this direction, toroidal magnetic field.Fig. 2 a is the preferred structure figure of optical sensor unit, it is identical with the second sensing fiber ring 12 coiling number of turns that first sensing fiber ring 11 is preferably set, also preferably can arrange the first wave plate 15 to overlap with the line outlet position of the first catoptron 13 at support 17, second wave plate 16 overlaps with the line outlet position of the second catoptron 14 at support 17, thus structurally more meet the requirement of ampere closed circuit, above-mentioned preferred setting can ensure that the size of the tested high-frequency current of the two paths of signals of two sensing fiber ring inductions is identical further, and the common-mode noise of carrying is consistent.
The principle of work of optical current sensor of the present invention is as follows: demodulation module exports two-route wire polarized light through polarization maintaining optical fibre 2 to optical sensor unit 1.High-frequency current signal to be measured is responded to by good the first sensing fiber ring 11 of insulating property in optical sensor unit 1 and the second sensing fiber ring 12.According to Faraday magnetooptical effect, light phase in the toroidal magnetic field modulated optical sensing element 1 that on bus, high-frequency current is formed, thus change the polarization angle of incident ray polarized light, changed by the phase place detecting polarized light thus obtain the high-frequency current information of high voltage bus or electrode.Specifically, the route polarized light that demodulation module is sent here by the first wave plate 15 (or second wave plate 16) changes into the contrary circularly polarized light of the identical sense of rotation of speed, under the magnetic fields of electric current to be measured, a branch of circularly polarized light speed is accelerated, another bundle circularly polarized light slows, and produces phase differential gradually when thus propagating in the first sensing fiber ring 11 (or second sensing fiber ring 12).According to Ampere circuit law, this phase differential is directly proportional to high-frequency current to be measured, two bundle circularly polarized lights through the first sensing fiber ring 11 end first catoptron 13 (or second catoptron 14 of the second sensing fiber ring 12 end) reflection after respectively former road turn back to the first wave plate 15 (or second wave plate 16) position, linearly polarized light is converted into again from circularly polarized light, return demodulation module, linearly polarized light now has attached the information of high-frequency current to be measured.The linearly polarized light carrying tested high voltage bus or electrode high-frequency current information turns back to demodulation module by the first polarization maintaining optical fibre 21 (or second polarization maintaining optical fibre 22), the polarization phase of demodulation module detection line polarized light changes and carries out calculation process based on difference induction, thus obtains the high-frequency current information of tested high voltage bus or electrode.
Carry the two-route wire polarized light of tested high voltage bus or electrode high-frequency current information, also carry common-mode noise simultaneously, the phase-modulation of high-frequency current to two-route wire polarized light of high voltage bus or electrode is in the same size, two-way high-frequency current direction is contrary, be equal to differential signal, the light signal comprising differential phase information passes to demodulation module and carries out subsequent treatment, by the difference induction calculation process of demodulation module, effectively can reduce common-mode noise, the accuracy of the tested electric current obtained is improved further.
The first sensing fiber ring 11 in optical sensor unit and the second sensing fiber ring 12 are arranged in the draw-in groove 18 of support 17, can be co-located in a draw-in groove, or be separately positioned in two draw-in grooves.When being set to two draw-in grooves, these two draw-in grooves can be at two identical closed hoops of the size of the both sides end surface symmetric setting of support 17, and two Fibre Optical Sensor rings are respectively along draw-in groove flexible coiling in direction contrary each other of this both sides end face of support.Certainly, these two draw-in grooves can also be two closed hoops be arranged side by side along the external annular surface of support 17, namely two draw-in grooves are all arranged on same external annular surface, and two Fibre Optical Sensor rings are respectively along draw-in groove flexible coiling in direction contrary each other of same external annular surface.
Optical sensor unit preferably also comprises the nonmetallic cover plate 19 covering draw-in groove, be wound on after in draw-in groove 18 at the first sensing fiber ring 11 and the second sensing fiber ring 12, can with multiple nonmetal small front apron by the position limitation of above-mentioned two sensing fiber rings in draw-in groove 18, preferably adopt the quantity of small front apron to be 4 to 16.Can load onto O-ring seal or sealing gasket in the surrounding of draw-in groove 18 afterwards, then cover cover plate 19, cover plate 19 also can think a part for support 17, the closing structure that cover plate 19 is also formed by two semicircular configuration or is made up of more arcuate structure.After cover plate 19 covers, can be fixed by nonmetal screw (as plastic screw).
Because support 17 is the closed hoop structure that two or more arc part is detachably formed, clamp from the inside relative engagement of surrounding of high voltage bus or electrode when mounted, form an overall ring texture.As support 17 is made up of two symmetrical semi-rings, from the both sides relative engagement clamping of high voltage bus or electrode during installation, form an overall ring texture.The light current sensor that this opening combinations is installed, solves the situation of on-the-spot high voltage bus or electrode dismounting difficulty, reduces difficulty of construction, easy for installation, without the need to dismantling high voltage bus or electrode, also facilitates daily servicing to change.
The structure of the optical current sensor adopting the optical sensor unit shown in Fig. 2 a to form as shown in Figure 3, polarization maintaining optical fibre comprises the first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22, the end of the first sensing fiber ring 11 connects the first catoptron 13, the other end of the first sensing fiber ring 11 connects the first polarization maintaining optical fibre 21 by the first wave plate 15, the other end that the end of the second sensing fiber ring 12 connects the second catoptron 14, second sensing fiber ring 12 connects the second polarization maintaining optical fibre 22 by the second wave plate 16.Demodulation module exports two-route wire polarized light and to receive respectively to optical sensor unit 1 and by the first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 through two polarization maintaining optical fibres and carry out calculation process based on difference induction after the two-way returned carries the linearly polarized light of tested current information and obtain tested high-frequency current.Owing to comprising the contrary sensing fiber ring in two coiling directions in optical sensor unit, demodulation module, by the combinatorial operation process to two paths of data, can improve accuracy, eliminate common-mode noise, reduce the impact of the factors such as vibration, also provide light path redundancy simultaneously, strengthen reliability.
As shown in Figure 4, demodulation module 4 comprises light source, coupling mechanism, first phase modulator, second phase modulator, the first detector, the second detector and differential processing module to a kind of preferred structure of demodulation module.Coupling mechanism is connected with the second detector with the first detector with light source, first phase modulator, second phase modulator respectively, concrete connection is: light source is connected with the input end of coupling mechanism, not only first detector is all connected with the output terminal of coupling mechanism with the second detector, and the other two-port of first phase modulator and second phase modulator butt coupling device can as input end but also can as output terminal.First phase modulator is connected with the first polarization maintaining optical fibre 21, second phase modulator is connected with the second polarization maintaining optical fibre 22, first detector is all connected with differential processing module with the second detector, and differential processing module is connected with second phase modulator with first phase modulator respectively.
The course of work of the demodulation module shown in Fig. 4 is: the linearly polarized light that light source sends is divided into two identical bunch polarized lights through coupling mechanism, deliver to first phase modulator and second phase modulator respectively, linearly polarized light is carried out phase-modulation by first phase modulator, become the linearly polarized light that two bundle polarization directions are vertical, this two bunch polarized light sends into optical sensor unit 1 through the first polarization maintaining optical fibre 21, current information to be measured is loaded in the phase place of linearly polarized light by magneto-optic effect by optical sensor unit 1, first sensing fiber ring 11 utilizes the first catoptron 13 that the linearly polarized light of subsidiary current information is sent back to first phase modulator through the first polarization maintaining optical fibre 21, first phase modulator carries out phase-modulation, become a branch of linearly polarized light carrying high-frequency current information to be measured, deliver to coupling mechanism again, in like manner, linearly polarized light is carried out phase-modulation by second phase modulator, become the linearly polarized light that two bundle polarization directions are vertical, this two bunch polarized light sends into optical sensor unit 1 through the second polarization maintaining optical fibre 22, current information to be measured is loaded in the phase place of linearly polarized light by magneto-optic effect by optical sensor unit 1, second sensing fiber ring 12 utilizes the second catoptron 14 that the linearly polarized light of subsidiary current information is sent back to second phase modulator through the second polarization maintaining optical fibre 22, second phase modulator carries out phase-modulation, become a branch of linearly polarized light carrying high-frequency current information to be measured, deliver to coupling mechanism again.Coupling mechanism receives two bundles returned and all carries beam splitting again after the linearly polarized light of high-frequency current information to be measured, a branch ofly enter the first detector, a branch ofly enter the second detector, the light signal received is changed into electric signal by the first detector and the second detector, delivers in differential processing module and carries out process computing obtain tested high-frequency current based on difference induction.
Fig. 5 is the another kind of preferred structure of demodulation module, and this structure also can think the structure of the further optimization of Fig. 4.The differential processing module of structure shown in Fig. 4 comprises the first AD converter, second AD converter, 3rd AD converter, 4th AD converter, first calculation process module, first D/A converter, second calculation process module, second D/A converter and compensating module, concrete connection is: the first detector is connected with the second AD converter with the first AD converter respectively, second detector is connected with the 4th AD converter with the 3rd AD converter respectively, first AD converter is all connected with the first calculation process module with the 3rd AD converter, second AD converter is all connected with the second calculation process module with the 4th AD converter, first calculation process module is connected with first phase modulator by the first D/A converter, second calculation process module is connected with second phase modulator by the second D/A converter, first calculation process module is all connected with compensating module with the second calculation process module.Coupling mechanism comprises the first coupling mechanism, the second coupling mechanism and the 3rd coupling mechanism, concrete connection is: the first coupling mechanism is connected with the 3rd coupling mechanism with light source, the second coupling mechanism respectively, second coupling mechanism is connected with the first detector with first phase modulator respectively, 3rd coupling mechanism is connected with the second detector with second phase modulator respectively, the simple 2*2 coupling mechanism of each coupling mechanism optional structure now or 1*2 coupling mechanism or 2*1 coupling mechanism can meet the demands, and reduce costs.
The course of work of the demodulation module shown in Fig. 5 is: the linearly polarized light that light source sends is divided into two identical bunch polarized lights through the first coupling mechanism, enter the second coupling mechanism and the 3rd coupling mechanism respectively, the linearly polarized light received is delivered to first phase modulator by the second coupling mechanism, become the linearly polarized light that two bundle polarization directions are vertical, optical sensor unit 1 is sent into through the first polarization maintaining optical fibre 21, high-frequency current information to be measured is loaded in the phase place of linearly polarized light by magneto-optic effect by optical sensor unit 1, utilize the first catoptron 13 that the linearly polarized light of subsidiary high-frequency current information is sent back to first phase modulator through the first polarization maintaining optical fibre 21, a branch of linearly polarized light carrying high-frequency current information to be measured is delivered to the second coupling mechanism by first phase modulator, and the linearly polarized light received is divided into two bundles by the second coupling mechanism, wherein a branch ofly enters the first detector, and another road turns back to light source and slatterns, the linearly polarized light received is delivered to second phase modulator by the 3rd coupling mechanism, becomes the linearly polarized light that two bundle polarization directions are vertical, sends into optical sensor unit 1 through the second polarization maintaining optical fibre 22.High-frequency current information to be measured is loaded in the phase place of linearly polarized light by magneto-optic effect by optical sensor unit 1, utilizes the second catoptron 14 that the linearly polarized light of subsidiary high-frequency current information is sent back to second phase modulator through the second polarization maintaining optical fibre 22; A branch of linearly polarized light carrying high-frequency current information to be measured is delivered to the 3rd coupling mechanism by second phase modulator, and the linearly polarized light received is divided into two bundles by the 3rd coupling mechanism, wherein a branch ofly enters the second detector, and another road turns back to light source and slatterns.After two-way detector in the demodulated module of the two ways of optical signals returned by optical sensor unit receives, the light signal received all is changed into electric signal by the first detector and the second detector, the electric signal of each road detector conversion uses two-way AD converter to carry out Collect conversion union afterwards, as shown in Figure 5, two-way detector respectively provides a road to carry out calculation process through Signal transmissions to the calculation process module of AD converter collection, obtains high-frequency current information respectively.Specifically: the signal of the first AD converter and the 3rd AD converter collection is entered the first calculation process module and processes, extract phase information, obtain high-frequency current information respectively divided by coefficients such as Verdet constants; The signal of the second AD converter and the 4th AD converter collection is entered the second calculation process module process, extract phase information, obtain high-frequency current information respectively divided by coefficients such as Verdet constants; The high-frequency current information that first calculation process module and the second calculation process module obtain enters compensating module, exports after additive operation cancellation common-mode noise and nonlinear compensation based on difference induction.Can check mutually between two-way AD signal and follow-up two-way current information thereof, improve the reliability of optical current sensor further.Under normal circumstances, two paths of signals size is basically identical, when there is relatively large deviation, can judge to have at least a road device to go wrong, and alarm.The output of the first calculation process module is also connected to first phase modulator by the first D/A converter, thus realizes the control to one of the two bunch polarized lights transmitted in first phase modulator; The output of the second calculation process module is also connected to second phase modulator by the second D/A converter, thus realizes the control to one of the two bunch polarized lights transmitted in second phase modulator.
The invention still further relates to a kind of high frequency testing system, measure for high-frequency current, in order to ensure signal to noise ratio (S/N ratio), sample frequency gets more than 10 times of signal frequency.High frequency testing system of the present invention can be measured accurately to the current signal of 50 ~ 50KHz.The structure of this high frequency testing system as shown in Figure 6, this high frequency testing system adopts optical current sensor of the present invention, also comprise interconnective fiber optical transceiver and host computer, fiber optical transceiver is connected with the demodulation module in optical current sensor.The high-frequency current information of the high voltage bus recorded or electrode exports by demodulation module, some other its information can also be exported, the temperature information recorded as set temperature sensor or export specified delayed data etc., pass to fiber optical transceiver through communications optical cable 5, fiber optical transceiver by data by sending host computer to the data-interface line 6 of host computer interface compatibility.Current data can be extracted by process software and carry out statistical calculation to it by host computer, display high-frequency current waveform and the statistics required for client further.
High frequency testing system of the present invention can adopt one, two or more optical current sensor, when adopting multiple optical current sensor, the optical sensor unit of each optical current sensor kind can be arranged on the diverse location of high voltage bus or electrode, to record high voltage bus or the electrode high-frequency current in multiple positions section, this system can also arrange the digital signal processor that can receive multichannel data, preferred structure as shown in Figure 7, this system comprises multiple optical current sensor, also comprise the digital signal processor connected successively, fiber optical transceiver and host computer, demodulation module in each optical current sensor is all connected with digital signal processor.The high-frequency current information of the high voltage bus recorded or electrode and out of Memory export according to user-defined format framing by demodulation module, digital signal processor is sent to through communications optical cable 5, digital signal processor receives the Multi-channel high-frequency current data that each demodulation module sends, carry out pulse period signal synchronously to pack process, fiber optical transceiver is passed to through communications optical cable 5, fiber optical transceiver by data by sending host computer to the data-interface line 6 of host computer interface compatibility, Multi-channel high-frequency current data to be extracted by process software and carries out statistical calculation by host computer, can in real time or time display current waveform and the statistics required for client.
Digital signal processor is the parts preferably adopted, and especially when system has multiple optical current sensor, arranges digital signal processor and can realize synchronous for Multi-channel high-frequency current data rear display in real time.High frequency testing system of the present invention, when an employing optical current sensor, also can arrange digital signal processor; In structure shown in Fig. 6, do not adopt digital signal processor, export data by demodulation module according to standard format, this kind is applied to detection single-phase current.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this instructions has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can modify to the invention or equivalent replacement; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (10)
1. an optical current sensor, it is characterized in that, comprise optical sensor unit, polarization maintaining optical fibre, insulator and demodulation module, described optical sensor unit, polarization maintaining optical fibre are connected successively with demodulation module, described optical sensor unit is supported by insulator, and described polarization maintaining optical fibre is positioned at the inner chamber of insulator, described optical sensor unit comprises the first sensing fiber ring and the second sensing fiber ring and all adopts the first wave plate of nonmetallic materials, first catoptron, second wave plate, second catoptron and support, described polarization maintaining optical fibre comprises the first polarization maintaining optical fibre and the second polarization maintaining optical fibre, the end of described first sensing fiber ring connects the first catoptron, the other end of the first sensing fiber ring connects the first polarization maintaining optical fibre by the first wave plate, the end of described second sensing fiber ring connects the second catoptron, the other end of the second sensing fiber ring connects the second polarization maintaining optical fibre by the second wave plate, described support is the closed hoop structure that two or more arc parts with draw-in groove are detachably formed, the draw-in groove of described each arc part is combined to form closed hoop, described first sensing fiber ring and the second sensing fiber ring are all wound in draw-in groove and coiling direction is contrary, the direction of current of described first sensing fiber ring and the induction of the second sensing fiber ring is contrary, described demodulation module exports two-route wire polarized light and to receive to optical sensor unit and by polarization maintaining optical fibre to respond to based on difference after the two-way returned carries the linearly polarized light of tested current information through polarization maintaining optical fibre and carry out calculation process and obtain tested electric current.
2. optical current sensor according to claim 1, it is characterized in that, described demodulation module comprises light source, coupling mechanism, first phase modulator, second phase modulator, first detector, second detector and differential processing module, described coupling mechanism respectively with light source, first phase modulator, second phase modulator is connected with the second detector with the first detector, described first phase modulator is connected with the first polarization maintaining optical fibre, described second phase modulator is connected with the second polarization maintaining optical fibre, described first detector is all connected with differential processing module with the second detector, described differential processing module is connected with second phase modulator with first phase modulator respectively.
3. optical current sensor according to claim 2, it is characterized in that, described differential processing module comprises the first AD converter, second AD converter, 3rd AD converter, 4th AD converter, first calculation process module, first D/A converter, second calculation process module, second D/A converter and compensating module, described first detector is connected with the second AD converter with the first AD converter respectively, described second detector is connected with the 4th AD converter with the 3rd AD converter respectively, described first AD converter is all connected with the first calculation process module with the 3rd AD converter, described second AD converter is all connected with the second calculation process module with the 4th AD converter, described first calculation process module is connected with first phase modulator by the first D/A converter, described second calculation process module is connected with second phase modulator by the second D/A converter, described first calculation process module is all connected with compensating module with the second calculation process module.
4. optical current sensor according to claim 3, it is characterized in that, described coupling mechanism comprises the first coupling mechanism, the second coupling mechanism and the 3rd coupling mechanism, described first coupling mechanism is connected with the 3rd coupling mechanism with light source, the second coupling mechanism respectively, described second coupling mechanism is connected with the first detector with first phase modulator respectively, and described 3rd coupling mechanism is connected with the second detector with second phase modulator respectively.
5. optical current sensor according to claim 1, it is characterized in that, the first sensing fiber ring in described optical sensor unit is identical with the second sensing fiber ring coiling number of turns, described first wave plate overlaps with the line outlet position of the first catoptron at support, and described second wave plate overlaps with the line outlet position of the second catoptron at support.
6. optical current sensor according to claim 5, it is characterized in that, described draw-in groove is at two identical closed hoops of the size of the both sides end surface symmetric setting of support, or described draw-in groove is two closed hoops be arranged side by side along the external annular surface of support, to hold the first sensing fiber ring and the second sensing fiber ring respectively.
7. optical current sensor according to claim 1, is characterized in that, described optical sensor unit also comprises multiple nonmetallic baffle plate first sensing fiber ring and the second sensing fiber ring are limited in draw-in groove, and the quantity of described baffle plate is 4 to 16.
8. optical current sensor according to claim 1, it is characterized in that, described optical sensor unit also comprises the nonmetallic cover plate covering draw-in groove, and be wound around the first sensor fibre and the second sensor fibre in draw-in groove after, described cover plate is fixed by nonmetal screw.
9. a high frequency testing system, is characterized in that, adopt the optical current sensor that one of claim 1 to 8 is described, also comprise interconnective fiber optical transceiver and host computer, described fiber optical transceiver is connected with the demodulation module in optical current sensor.
10. high frequency testing system according to claim 9, it is characterized in that, comprise two or more optical current sensor, also comprise digital signal processor, described fiber optical transceiver is connected with the demodulation module in optical current sensor by digital signal processor, described digital signal processor receives the tested current data of the demodulation module in each optical current sensor, pass to host computer by fiber optical transceiver after carrying out synchronous packing process, described host computer carries out statistical calculation process to the tested current data of multichannel.
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| CN109375138B (en) * | 2018-11-06 | 2021-04-09 | 国网内蒙古东部电力有限公司电力科学研究院 | Light path fault self-diagnosis alarm device and method for optical fiber current transformer |
| CN109858417B (en) * | 2019-01-22 | 2021-02-02 | 上海思立微电子科技有限公司 | Optical fingerprint imaging device under screen |
| CN110412436A (en) * | 2019-07-23 | 2019-11-05 | 大连世有电力科技有限公司 | Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement |
| CN115166331B (en) * | 2022-07-21 | 2023-08-11 | 哈尔滨理工大学 | Fiber current transformer based on fiber laser and GMM |
| CN115453178A (en) * | 2022-08-09 | 2022-12-09 | 北京世维通光智能科技有限公司 | Aluminum electrolytic cell cathode current measuring device and method |
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