CN206920502U - Patrilineal line of descent with only one son in each generation feels double sampled all-fiber current transformator - Google Patents

Abstract

The utility model provides a kind of patrilineal line of descent with only one son in each generation and feels double sampled all-fiber current transformator, mainly include optical fiber sensing system and data handling system, wherein, the optical fiber sensing system is mainly comprising light source, coupler, the polarizer, 45 ° of fusion points, delay optical fiber, quarter wave plate, fiber optic coils, speculum and photodetector, the data handling system is mainly made up of two sets of data processing units, and often covering the data processing unit includes analog-to-digital conversion module, CPU, D/A converter module, output module and phase-modulator；Patrilineal line of descent with only one son in each generation of the present utility model feels the method for work of double sampled all-fiber current transformator and its performance optimization and reliability lifting; the structure of existing all-fiber current transformator is optimized; break through the key technology of " patrilineal line of descent with only one son in each generation sense, more samplings "; realize measurement with the synchronous operation with protection; improve operation stability; and its engineering manufacture cost is reduced, effective guarantee power system supplies the continuity and reliability of distribution.

Description

Patrilineal line of descent with only one son in each generation feels double sampled all-fiber current transformator

Technical field

A kind of intelligent substation passive electrical type current transformer is the utility model is related to, more particularly to a kind of base In the all-fiber current transformator of patrilineal line of descent with only one son in each generation sense double-sampling and its method for work of performance optimization and reliability lifting.

Background technology

Widely used in power system at present is electromagnetic current transducer.Its structure is similar to transformer, once Windings in series in tested current circuit, with current measure device or relay protection device connect by secondary winding, a secondary side around Group is wound on same iron core, and the conversion of electric current between a secondary side is realized by the magnetic coupling of iron core.One secondary side winding it Between and winding and iron core between to take certain insulation measures, to ensure the electrical isolation between primary side and secondary side. , can be by primary side by rationally changing a secondary side winding turn ratio according to application scenario and the difference of tested size of current Current value scaling transformation into standard 1A or 5A current values, for drive secondary side electric equipment or for measuring instrumentss use. But with the rise of voltage class of electric power system and the increase of transmission capacity, traditional electromagnetic current transducer is also faced with Problems：

1st, insulation system is complicated, size is big, cost is high.With the raising of voltage class, paper oil insulation and gas are employed The mode of insulation；In supergrid, the method that tandem insulate is employed.As can be seen here, with the raising of voltage class, electricity The insulation system of magnetic-type current transformer becomes increasingly complex, more and more inconvenient in manufacture, cost also more and more higher.

2nd, accuracy of measurement can not meet.With the increase of electrical power system transmission capacity, the dynamic of electric current and electric current is transmitted State scope constantly increases, because electromagnetic current transducer measurement dynamic range caused by magnetic saturation and hysteresis problems is small, frequency The problems such as response range is narrow and measurement accuracy is not high, which seems, to become increasingly conspicuous.

3rd, equipment installation, maintenance are inconvenient, and maintenance workload is big.Due to bulky, the weight of electromagnetic current transducer Measure heavier, transport installation is extremely inconvenient, needs insulating support to support in normal operation, corresponding also to bring not side to maintenance Just.

4th, potential danger be present.Realize that energy passes by electromagnetism transform principle between one or two times of electromagnetic current transducer Pass, therefore electromagnetic connection is constantly present between one or two times.If certain reason causes the secondary side to open a way, primary side is big Electric current goes completely into exciting current, will induce high voltage in secondary side, jeopardizes the person and the safety of equipment.

5th, the problem of electromagnetic interference be present.In hyperbaric environment, the current signal of electromagnetic current transducer passes through wire By by serious electromagnetic interference during transmission, accuracy of measurement is influenceed.

Therefore, traditional electromagnetic current transducer has been difficult the demand for development for meeting power system, is studied new Current transformer is imperative.Increasingly mature with photoelectron technology, electronic current mutual inductor is increasingly becoming modern electric The important directions of the required novel current transformer of industry.Key of the electronic current mutual inductor as intelligent substation construction One of equipment, there is very important status.Electronic current mutual inductor have dynamic range is big, frequency response is wide, small volume, The advantages that light weight, and widely used digital output in 110 (66) kV and system above, in that context it may be convenient to carry out intelligence Energyization, Automated condtrol, it is the inexorable trend of intelligent substation development.

In application process, there is the problem of many in electronic current mutual inductor, including causes during disconnecting switch folding The problem of false protection, functions of modules failure etc. are various, main Types be Insulation Problems, fiber failure, sensor fault, The problems such as collector failure, electromagnetic interference influence and combining unit failure, the appearance of these problems, it is primarily due to electronic type electricity Current transformer does not account for the high pressure side of live complicated applicable cases and designer to product in design and application The performance in face considers deficiency.

The electronic current mutual inductor applied at present is divided into Active Electronic Current Transformer and passive from e measurement technology Electronic current mutual inductor.Then the former is carried out signal using the electromagnetic induction principle sensing primary side current of air core coil Optical fiber transmission signal is used after electro-optic conversion, so high-pressure side needs to supply energy to electro-optical conversion circuit；The latter is then using inclined Shake rotation effect of the light in magnetic field, therefore turns into the master that electronic current mutual inductor develops without energy supply in high-pressure side Flow direction.Particularly all-fiber current transformator, power department is larger to all-fiber current sensor demand and usage amount at present, But lack prolonged operating experience, practice stage all-fiber current transformator structure due to single fiber can not be realized Sensor double A/D Sampling techniques, to form double A/D backup, it is necessary to backed up with two fibre optical sensors, so resulted in The use cost of active electronic type instrument transformer is high, influences the popularization and application of passive electrical type current transformer.

In summary, although there is increasing novel current transformer to come into operation or carry out live test run both at home and abroad OK, but requirement of the power system on reliability, precision and measurement range is fully met, also many aspects need further Research and improvement.Therefore, the utility model is by passive electrical minor current transformer structure optimization design research, ensureing nothing On the basis of the electronic current mutual inductor stability of source, its structure is optimized, reduces its cost, in favor of passive electrical minor The promotion and application of current transformer.

Utility model content

The defects of existing for prior art or deficiency, the purpose of this utility model are that providing a kind of patrilineal line of descent with only one son in each generation that is based on feels double The all-fiber current transformator of Sampling techniques, the structure of existing all-fiber current transformator is optimized, break through " patrilineal line of descent with only one son in each generation sense, The key technology of more samplings ", realize that measurement with the synchronous operation with protection, improves operation stability, and reduce its engineering system Cause this, effective guarantee power system supplies the continuity and reliability of distribution.

To achieve these goals, the utility model proposes one kind patrilineal line of descent with only one son in each generation to feel double sampled all-fiber current transformator,

Mainly include optical fiber sensing system and data handling system, wherein, the optical fiber sensing system mainly comprising light source, Coupler, the polarizer, 45 ° of fusion points, delay optical fiber, quarter wave plate, fiber optic coils, speculum and photodetector, the data Processing system is mainly made up of two sets of data processing units, often cover the data processing unit include analog-to-digital conversion module, in Central Processing Unit, D/A converter module, output module and phase-modulator；

Wherein, the light source, coupler, the polarizer, 45 ° of fusion points, first phase modulator, second phase modulator, Delay optical fiber, quarter wave plate, fiber optic coils and speculum set gradually to form light-path；

The coupler is also connected with the input of photodetector；The photodetector output end respectively with the first mould Signal path is formed between number modular converter and the input of the second analog-to-digital conversion module；First analog-to-digital conversion module, One CPU, the first D/A converter module and first phase modulator set gradually to form signal path；Described second Analog-to-digital conversion module, the second CPU, the second D/A converter module and second phase modulator set gradually to form letter Number path；First CPU also forms signal path between the first output module；Second CPU also with Second output module forms signal path.

Further, the photodetector output end and the first analog-to-digital conversion module and the second analog-to-digital conversion module it Between be provided with the signal isolator of one-in-and-two-out, the electric signal that photodetector is exported is divided into two parts and is transferred to respectively One analog-to-digital conversion module and the second analog-to-digital conversion module.

Further, the two sets of data processing unit also has the first data acquisition module and the second data acquisition respectively Module.

Further, the light source uses super-radiance light emitting diode.

Further, the photodetector is PIN photodiode.

Compared with existing all-fiber current transformator detection technique, the utility model detection is safe, rapid, accurate, just It is used cooperatively in protective relaying device, and reduces use cost, is specifically had the beneficial effect that：

Using a kind of integrated sensing light path scheme distributed rationally, coordinate double A/D, double D/A control circuits, be easy to implement and adopt Rapid, the accurate measurement of sample data, the protective relaying maloperation caused by reducing measurement error are made, and improve the comparativity of measurement With accuracy, meet the reliability requirement of relay protection scheme；All-fiber current transformator is realized in more Larger Dynamic scope Electric current accurately detects, and improves the comparativity and accuracy of output signal, be easy to detection signal carry out in real time processing and with after Electrical protective device is combined.

Brief description of the drawings

By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to this practicality New limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：

Fig. 1 is the structural representation that the utility model patrilineal line of descent with only one son in each generation feels double sampled all-fiber current transformator.

Symbol in Fig. 1 represents：1- fiber optic coils；2- speculums；3-1/4 wave plates；4- postpones optical fiber；5-45 ° of fusion point； The 6- polarizers；7- couplers；8- light sources；9- photodetectors；10- first phase modulators；11- second phase modulators；12- First analog-to-digital conversion module；The CPU of 13- first；The D/A converter modules of 14- first；The first output modules of 15- 1；16- Second analog-to-digital conversion module；The CPU of 17- second；The D/A converter modules of 18- second；The output modules of 19- second；20- Second data acquisition module；The data acquisition modules of 21- first；22- measured conductors.

Embodiment

The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although this public affairs is shown in accompanying drawing The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here The mode of applying is limited.Conversely, there is provided these embodiments are to be able to be best understood from the disclosure, and can be by this public affairs The scope opened completely is communicated to those skilled in the art.

The utility model is more specifically described by way of example referring to the drawings in the following passage.According to following explanation and power Sharp claim, advantages and features of the present utility model will become apparent from.It should be noted that accompanying drawing using very simplified form and Non- accurately ratio is used, only to purpose that is convenient, lucidly aiding in illustrating the utility model embodiment.

Double sampled all-fiber current transformator is felt by optical fiber sensing system and data processing based on patrilineal line of descent with only one son in each generation in the utility model System is formed.

1st, optical fiber sensing system is by light source 8,6,45 ° of fusion points 5 of the polarizer, delay optical fiber 4, quarter wave plate 3, optical fiber cable The closure light path system that circle 1, speculum 2, coupler 7 and photodetector 9 are formed, realizing the light that light source is sent can be divided into The orthogonal polarised light of two beams, and the light of two beam polarization states is propagated in identical light path, there is identical transmission characteristic and attached Add phase, while light wave is detoured one week when returning to starting point in the optical path to produce phase place change, produced in starting point Sagnac interferes, and specific optimization method is as follows：

First, one of core devices as optical fiber sensing system, the performance of light source directly affect the technology of whole system Index.Current light source can not meet fibre optical sensor required by light source volume it is small, be easy to it is appropriate, bright with fiber coupling, wavelength Degree is enough and energy loss is small, preferable coherence and stability and continuous-stable work, for existing for current light source not Foot, this method optimizes by using super-radiance light emitting diode light source, be between laser diode and light emitting diode it Between wide spectrum low-coherence light source, its power output P meets driving current i, junction temperature T, light-emitting area s and optical coupling efficiency η Functional relation：

P=f (i, T, s, η) (1)

Super-radiance light emitting diode light source has short coherence length, significantly reduce rayleigh backscattering in fiber turns and Noise caused by nonlinear optical Kerr effect etc., and there is higher power output and less beam divergence angle, improve It is coupled into the power of tail optical fiber and the signal to noise ratio of system.

Secondly, as the most critical device of optical fiber sensing system, the wave plate of the λ of full fiber type/4 is generally selected, is directly affected Linearly polarized light on transmission line is converted to the measurement accuracy of the circularly polarized light for sensing.Currently, due to the delay light of preparation Fibre can not be accurately controlled to 45 ° shaft angle degree, and can not accurately intercept 1/4 bat length, and linear polarization is converted into elliptical polarization Light, cause the scale factor of whole measuring system to change, influence measurement accuracy.The utility model passes through to the wave plate of λ/4 Preparation method optimizes：

1) 45 ° of weldings accurately are realized --- light source output light is polarized by optical fiber polarizer, generates a branch of linearly polarized light, As flashlight when making λ/4 wave plate for monitoring, Transmission Fibers and slide optical fiber are then respectively put into two fibre clips In tool, postponing tentatively to be aligned in optical fiber splicer using semiautomatic welding mode, the other end of wave plate optical fiber then accesses polarization Analyzer, the polarization extinction ratio (PER) and degree of polarization (DOP) of transmission light are detected in real time, by the horse for adjusting heat sealing machine Reach, and can be manually rotated wave plate optical fiber, when the PER of transmission light reaches minimum value and DOP reaches maximum, carry out electric discharge welding Accurately realize 45 ° of weldings；

2) length is clapped in intercept wave plate optical fiber 1/4 --- by wave plate input end fiber, 45 ° of fusion points and wave plate optical fiber group Into fiber segment take out from heat sealing machine and (do not unclamp fiber clamp), using the outer of fiber clamp as starting point, existed with slide measure Good required 1/4 is measured on fixture and claps length, then is defined by fixture outer, by fiber segment on fixture integrally to wave plate input Length is measured in the direction movement of optical fiber, and the fiber segment for then clamping fixture is put into optical fiber cutter, you can required will be cut Take the cut point of length to be accurately positioned over directly over blade, the new fiber segment after cutting just include wave plate input end fiber, The wave plate optical fiber of 45 ° of fusion points and only surplus 1/4 bat length.

3) wave plate of optical fiber λ/4 prepared can keep pi/2 phase between fast axle and slow axis to postpone, and realize linearly polarized light and circle Complete correct conversion between polarised light, the accurate detection of electric current is completed using Faraday effects.

Again, for light signal strength it is difficult to directly be handled, this method is selected to light radiation wavelength non-selectivity PIN photodiode realizes the conversion between optical signal and electric signal, most incident lights are in I layers as photodetector It is interior to be absorbed and produce substantial amounts of electron-hole pair, and the very high p-type of the doping concentration in I layers both sides and N-type semiconductor absorb The ratio very little of incident light, therefore light produces drift component in electric current and account for leading position, greatly accelerates response speed, improves The degree of accuracy of detection.

2nd, the closed loop configuration that data handling system is made up of the sets of data processing unit of identical two, often covering processing unit can Signal modulation, demodulation, closed loop three parts function are carried out, realizes the light intensity with current information obtained to optical fiber sensing system Opto-electronic conversion, enhanced processing and the signal demodulation of signal, the final size of current for obtaining measured conductor.

The method of work that patrilineal line of descent with only one son in each generation feels double sampled all-fiber current transformator in the utility model is to pass through optical fiber sensing system The light that light source 8 is sent is entered into the polarizer 6 through coupler 7, obtained linearly polarized light is divided into polarization side after 45 ° of fusion points 5 To mutually perpendicular two bunch polarised light, along two pattern individual transmissions of delay optical fiber 4；Two bunch polarised lights pass through λ/4 Wave plate 3 is converted to left-handed and right-circularly polarized light and enters fiber optic coils 1 after acting on；In fiber optic coils 1, in current-carrying Under magnetic fields caused by wire ampere effect, two beam circularly polarized lights respectively undergo Faraday effect and produce faraday's phase shift； Mirror-reflection occurs when transmitting to speculum, left circularly polarized light is changed into right-circularly polarized light, and right-circularly polarized light turns It is changed into left circularly polarized light, is then returned counterclockwise along fiber optic coils；In return course, two beam circularly polarized lights of modes swap exist Under magnetic fields again each experience Faraday effect produce faraday's phase shift, most afterwards through λ/4 wave plate 3 effect revert to partially Shake the mutually perpendicular two bunch polarised light in direction, enters photodetection after 45 ° of fusion points 5 interfere at the polarizer 6 Device 9；Finally the light intensity with current information obtained to optical fiber sensing system is realized by two sets of data data processing units Opto-electronic conversion, enhanced processing and the signal demodulation of signal, the final size of current for obtaining measured conductor.

Specific detecting step is as follows：

Fiber optic coils 1 are placed in measured conductor 22, light source 8 sends Wavelength stabilized light using super-radiance light emitting diode, By coupler 7 using 1: 1 splitting ratio, the directly incoming light of photodetector 9,1/2 of 1/2 light is passed to the polarizer 6；

By the polarizer 6, light is changed into line polarisation, then the line polarisation Orthogonal Decomposition mutually hangs down for two beams through 45 ° of fusion points 5 Straight line polarisation, it is injected separately into the fast axle and slow axis of delay optical fiber 4, by the modulation of first, second phase-modulator 10,11 With delay optical fiber, the orthogonal line polarisation of two beams is injected in quarter wave plate 3, forms the circular polarization of two beam left-handed rotations and right-handed rotation Light, and enter sensing fiber coil 1；

Two beam rotatory polarizations produce Faraday effects so that two beam rotatory polarizations are opposite under the function of current of measured conductor 22 Direction produce phase shift, i.e. θ=2VNI, reach speculum 2, two beam rotatory polarizations are along opposite multipath tolerant, by an optical fiber Phase shift occurs again for coil 1, and now the phase difference of two beam rotatory polarizations is θ=4VNI, and again by quarter wave plate 3, rotatory polarization turns Line polarisation is changed to, then by delay optical fiber 4, phase-modulator 10,11 and the polarizer 6, and pass 1/2 light at coupler 7 Enter photodetector 9.

The signal that photoelectric sensor 9 is obtained passes through first, second analog-to-digital conversion module 12,16, is synchronously separately input to First, second CPU 13,17, realize to the light intensity signal with current information of optical fiber sensing system acquisition Enhanced processing and signal demodulation, the final size of current for obtaining measured conductor are sent to first, second output mould as output Block 15,19, while be controlled by first, second D/A converter module, 14,18 pair of first, second phase-modulator 10,11.

It is provided by the utility model based on the all-fiber current transformator performance optimization for passing on a skill from a master to a single disciple sense double-sampling and reliable Property method for improving, effectively can quickly and accurately detect the electric current of measured conductor, it is achieved thereby that with relay protection scheme can By combining.

In addition, photodetector converts optical signal into electric signal, and it is connected with the signal isolator of one-in-and-two-out, by electricity Signal is divided into 2 parts, is connected respectively with 2 independent signal processing systems, completes the subsequent treatment of electric signal.

The voltage signal of photodetector output carries out blocking processing first, then after amplification and filtering, turns through modulus Parallel operation conversion digital signal, the CPU for being then fed into data signal carry out data demodulation, integration and filtering process, and Staircase waveform shoulder height is calculated by staircase waveform generating algorithm, the staircase waveform and fixed cycle modulated square wave are in SECO afterwards Unit control is lower to be superimposed, then forms analog voltage waveform after the digital analog converter conversion of central processing unit controls, drives phase Position modulator, so far completes a closed loop feedback of system, and exports measured conductor size of current.

It is described above, the only preferable embodiment of the utility model, but the scope of protection of the utility model is not This is confined to, any one skilled in the art can readily occur in the technical scope that the utility model discloses Change or replacement, should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be with The scope of the claims is defined.

Claims (5)

1. one kind patrilineal line of descent with only one son in each generation feels double sampled all-fiber current transformator, it is characterised in that：

Mainly include optical fiber sensing system and data handling system, wherein, the optical fiber sensing system is mainly comprising light source, coupling Device, the polarizer, 45 ° of fusion points, delay optical fiber, quarter wave plate, fiber optic coils, speculum and photodetector, the data processing System is mainly made up of two sets of data processing units, and often covering the data processing unit includes analog-to-digital conversion module, centre Manage unit, D/A converter module, output module and phase-modulator；

Wherein, the light source, coupler, the polarizer, 45 ° of fusion points, first phase modulator, second phase modulator, delay Optical fiber, quarter wave plate, fiber optic coils and speculum set gradually to form light-path；

The coupler is also connected with the input of photodetector；The photodetector output end turns with the first modulus respectively Signal path is formed between mold changing block and the input of the second analog-to-digital conversion module；In first analog-to-digital conversion module, first Central Processing Unit, the first D/A converter module and first phase modulator set gradually to form signal path；Second modulus Modular converter, the second CPU, the second D/A converter module and second phase modulator, which are set gradually, to be formed signal and leads to Road；First CPU also forms signal path between the first output module；Second CPU is also with second Output module forms signal path.

2. patrilineal line of descent with only one son in each generation according to claim 1 feels double sampled all-fiber current transformator, it is characterised in that：Visited in the photoelectricity Survey between device output end and the first analog-to-digital conversion module and the second analog-to-digital conversion module and be provided with the signal isolator of one-in-and-two-out, Two parts are divided into the electric signal for exporting photodetector and are transferred to the first analog-to-digital conversion module and the second analog-to-digital conversion respectively Module.

3. patrilineal line of descent with only one son in each generation according to claim 1 feels double sampled all-fiber current transformator, it is characterised in that：Two sets of data Processing unit also has the first data acquisition module and the second data acquisition module respectively.

4. patrilineal line of descent with only one son in each generation according to claim 1 feels double sampled all-fiber current transformator, it is characterised in that：Light source is stated using super Radiation light emitting diode.

5. patrilineal line of descent with only one son in each generation according to claim 1 feels double sampled all-fiber current transformator, it is characterised in that：The photodetection Device is PIN photodiode.