CN105301302A - High-precision all-fiber current transformer sensing coil manufacturing method - Google Patents
High-precision all-fiber current transformer sensing coil manufacturing method Download PDFInfo
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Abstract
The invention provides a high-precision all-fiber current transformer sensing coil manufacturing method. The method comprises the following steps: 1) establishing an experiment detection device for preparation of a Lambda/4 fiber wave plate, and serving the generated linearly-polarized light as signal light; 2) carrying out 0-degree welding between one end of a panda polarization-maintaining fiber and a tail fiber of output light of the experiment detection device; 3) carrying out 45-degree countershaft welding between the other end of the panda polarization-maintaining fiber and one end of an elliptic core polarization-maintaining optical fiber; 4) cutting a specific length of elliptic core polarization-maintaining optical fiber by adopting a cut-off method to prepare the Lambda/4 fiber wave plate (5); 5) if the Lambda/4 fiber wave plate (5) meets assigned requirements, carrying out the step 6), and if not, repeating the steps 2)-4); 6) carrying out 0-degree welding between the output end of the Lambda/4 fiber wave plate (5) and the input end of a sensor fiber (4) having a reflector (3); 7) carrying out protection and fixation; and 8) carrying out moisture drying and optical fiber inner stress releasing. The high-precision all-fiber current transformer sensing coil manufacturing method effectively improves measurement accuracy, stability and reliability of a sensing coil.
Description
Technical field
The present invention relates to all-fiber current transformator field, particularly a kind of method for making of high-accuracy all-fiber current transformer sensing ring.
Technical background
Intelligent grid construction is the important foundation construction project in China " 12 " planning, is the important component part of China's National strategic planning.So-called intelligent grid is combined at the sensing measurement technology of advanced person, ICT (information and communication technology), analysis decision technology, automatic control technology and electricity power technology, and and that formed new-modernization electrical network integrated with power grid construction infrastructure height.Development intelligent grid key equipment is the necessary means realizing intelligent grid.Current transformer be in electrical network the most generally, one of the most basic high-tension apparatus; bear the important mission of relay protection and electric energy metrical; its performance quality is directly connected to the safe operation of the accurate of electric energy metrical and electric power networks, necessarily requires its to measure accurately, responds fast and stable and reliable operation.Insulation characterisitic is good, dynamic response is fast, structure is simple, frequency response range is wide, anti-electromagnetic interference capability is strong, can survey the incomparable advantage of traditional mutual inductors such as direct current because it has for all-fiber current transformator, has broad application prospects in intelligent grid construction.
All-fiber current transformator is a kind of polarized interferometer of Sagnac type, carries out current measurement based on Ampère law and Faraday effect, and its transmission all uses optical fiber with transducing part, has excellent reciprocity and a stronger anti-external environmental interference ability.It is formed primarily of light path system and Circuits System, its light path system mainly comprise light source, coupling mechanism, the polarizer, straight waveguide phase modulator, guarantor's off-delay optical cable, sensing ring and photodetector etc.It requires that light keeps specific polarization state in communication process, and nonideal optical device can cause the crosstalk between polarized light, affects measuring accuracy and stability.
Sensing ring is the key component of all-fiber current transformator light path reciprocity design, is generally made up of λ/4 optical-fibre wave plate, sensor fibre, catoptron three part.It provides the closed light path of transmission for orthogonal two bundle polarized lights on the one hand, on the other hand the responsive closed magnetic field through being formed around electric current in wire wherein, between two bundle polarized lights, form phase differential.At present, in sensing ring, the making of λ/4 optical-fibre wave plate, sensor fibre linear birefrigence error, sensing ring overall package technique etc. are the key factors affecting the measuring accuracy of all-fiber current transformator, stability and reliability, seriously constrain its practicalization in intelligent grid is built.
Summary of the invention
Goal of the invention
The object of this invention is to provide a kind of method for making of high-accuracy all-fiber current transformer sensing ring; mainly comprise the precise manufacture method of λ/4 optical-fibre wave plate, the linear birefrigence error inhibition method of sensor fibre and safeguard measure, the overall package structure of sensing ring and method, effectively improve the measuring accuracy of sensing ring, stability and reliability.
Technical scheme
The present invention is a kind of high-accuracy all-fiber current transformer sensing ring method for making, wherein, comprises the steps:
Step 1, build the experimental detection device that λ/4 optical-fibre wave plates makes, the linearly polarized light of generation is as flashlight;
The tail optical fiber that step 2, panda protecting polarized light fiber one end and experimental detection device export light carries out 0 ° of welding;
Step 3, the panda protecting polarized light fiber other end and ellipse core polarization maintaining optical fibre one end carry out 45 ° to axle welding;
Step 4, the ellipse core polarization maintaining optical fibre adopting intercept method to intercept designated length make λ/4 optical-fibre wave plate, the index test of line phase of going forward side by side delay and degree of polarization;
If step 5 λ/4 optical-fibre wave plate satisfies specified requirement, carry out step 6, if do not meet the demands, repeat step 2 ~ 4;
Step 6, λ/4 optical-fibre wave plate output terminal carry out 0 ° of welding with sensor fibre 4 input end with catoptron;
Step 7, overall double-layer seal protection is carried out to λ/4 optical-fibre wave plate, sensor fibre and catoptron, and parallel discs is around on notched resin structure part base, carries out protecting and fixing;
Step 8, high/low temperature circulation impact is carried out to sensing ring entirety, carry out the dry and inside of optical fibre stress relief of steam.
A kind of high-accuracy all-fiber current transformer sensing ring method for making as above, wherein:
In step 1, described experimental detection device comprises: SLD light source, protect inclined circulator, Polarization instrument; What the tail optical fiber of SLD light source was protected inclined circulator with 0 ° of welding enters fibre, and the tail optical fiber protecting inclined circulator produces linearly polarized light.
A kind of high-accuracy all-fiber current transformer sensing ring method for making as above, wherein:
In step 2, protect inclined circulator using one end of 0 ° of welding panda protecting polarized light fiber as input end, during welding, the other end of panda protecting polarized light fiber is connected the input end of Polarization instrument as output terminal, Real-Time Monitoring exports extinction ratio and the degree of polarization of light, by regulating the motor of heat sealing machine manually to dock, when extinction ratio and degree of polarization all reach maximal value, carry out electric discharge welding.
A kind of high-accuracy all-fiber current transformer sensing ring method for making as above, wherein:
In step 3, by the output terminal of panda protecting polarized light fiber with 45 ° of one end to the ellipse core polarization maintaining optical fibre of axle welding, first the output terminal of panda protecting polarized light fiber is placed on the left side fixture of Polarization Maintaining Optical Fiber Fusion Splicer, one end of ellipse core polarization maintaining optical fibre is placed on the right side fixture of Polarization Maintaining Optical Fiber Fusion Splicer, the input end of other end access Polarization instrument, Real-Time Monitoring exports extinction ratio and the degree of polarization of light, manually dock by regulating the motor of heat sealing machine, when extinction ratio reaches minimum value and degree of polarization reaches maximal value, carry out electric discharge welding.
A kind of high-accuracy all-fiber current transformer sensing ring method for making as above, wherein:
In step 4, with following formula for foundation intercepts,
Namely desired phase delay is:
In formula: L
pthe bat being ellipse core polarization maintaining optical fibre is long, and z is the length intercepting optical fiber.
A kind of high-accuracy all-fiber current transformer sensing ring method for making as above, wherein:
In step 6, during welding, by the λ/4 optical-fibre wave plate output terminal made with the side of 0 ° of welding sensor fibre, wherein sensor fibre and catoptron adopt integrative packaging structure, utilize chemical vapour deposition technique to plate deielectric-coating at the end face of sensor fibre one end, and adopt kapillary carried out anti-steam protection obtain; Be connected with detector at the output terminal protecting inclined circulator, by regulating the motor of Polarization Maintaining Optical Fiber Fusion Splicer manually to dock, exported the signal intensity of light by detector Real-Time Monitoring, when intensity reaches maximum, Polarization Maintaining Optical Fiber Fusion Splicer being carried out electric discharge welding.
A kind of high-accuracy all-fiber current transformer sensing ring method for making as above, wherein:
In step 7, in sensing ring, panda protecting polarized light fiber, λ/4 optical-fibre wave plate, sensor fibre and catoptron are after all welding completes, whole section of optical fiber is penetrated glass capillary, seal protection is carried out with ultra-violet curing glue respectively at two ends, protect with the high-temperature hot draw outside glass capillary again, and carry out heat curing;
The structural member upper cover of sensing ring and base utilize fire resistant resin materials processing to make, structural member base engraves the wide annular groove of 1.5cm and the wide oblique groove of 0.5cm respectively, by flat around in annular groove for the whole section of optical fiber overlapped with double shielding, panda protecting polarized light fiber passes from oblique groove, in annular groove, then fills ultra-violet curing glue be cured by whole section of optical fiber;
Finally, structural member upper cover and structural member base through screws are fixed, and carry out seal protection at the gap ultra-violet curing glue at contact structure place.
A kind of high-accuracy all-fiber current transformer sensing ring method for making as above, wherein:
After sensing ring entirety has been assembled, put it in incubator, make it in-40 ~ 80 DEG C of temperature ranges, carry out high/low temperature circulation, height warm spot is incubated 6 hours respectively, temperature rate 1 DEG C/min, carry out 4 ~ 6 high/low temperature circulation impacts, carry out the drying of sensing ring internal steam and inside of optical fibre stress relief.
Beneficial effect
This method provides a kind of method for making of high-accuracy all-fiber current transformer sensing ring, effectively improves the measuring accuracy of sensing ring, stability and reliability.
Accompanying drawing explanation
Shown in Fig. 1 is all-fiber current transformator sensing toroidal ring structure schematic diagram of the present invention;
Shown in Fig. 2 is sensing ring method for making schematic flow sheet of the present invention;
Shown in Fig. 3 is all-fiber current transformator sensing ring light channel structure principle schematic of the present invention;
Shown in Fig. 4 is all-fiber current transformator sensing ring superstructure schematic diagram of the present invention.
Wherein: 1-base, 2-screw, 3-catoptron, 4-sensor fibre, 5-λ/4 optical-fibre wave plate, 6-annular groove, 7-oblique groove, 8-panda protecting polarized light fiber, 9-upper cover, the ellipse core polarization maintaining optical fibre of 10-, 11-SLD light source, 12-protects inclined circulator, 13-polarization analysis instrument, 14-cutter, 15-photodetector, 16-glass capillary, the 17-high-temperature hot draw.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the present invention is described further.
A kind of high-accuracy all-fiber current transformer sensing ring method for making of the present invention, wherein, sensing ring is the sensitive part of all-fiber current transformator, it works based on the Faraday effect of magnetic field to the circularly polarized light transmitted in sensor fibre in sensing ring, desirable sensing ring needs to ensure that light is propagated wherein and propagates with desirable circular polarization state as far as possible, and its degree of accuracy and stability directly affect degree of accuracy and the stability of all-fiber current transformator.
Its method for making mainly comprises the precise manufacture method of λ/4 optical-fibre wave plate, the linear birefrigence error inhibition method of sensor fibre and safeguard measure, the overall package structure of sensing ring and method.
As shown in Figure 1, sensing ring of the present invention mainly comprises λ/4 optical-fibre wave plate 5, sensor fibre 4, catoptron 3 three optical device.Its principle is, by λ/4 optical-fibre wave plate 5, the linearly polarized light of two bundle orthogonal modes is converted to left-handed and right-circularly polarized light respectively, enters sensor fibre 4.In sensor fibre 4, due to the Faraday magneto-optic effect effect of current induced magnetic field in wire, the velocity of propagation of two bundle circularly polarized lights is different, thus produces Faraday difference.When two bundle circularly polarized lights are transferred to sensor fibre end, mirror-reflection is there is by catoptron 3, two-beam is in the left-handed change dextrorotation of modes swap, dextrorotation becomes left-handed to return along original optical path afterwards, Faraday effect doubles, and the linearly polarized light pattern again changing two bundle orthogonal modes at λ/4 optical-fibre wave plate 5 place into has also been exchanged and transmitted along polarization maintaining optical fibre 8.
Concrete, sensing ring of the present invention is formed primarily of base 1, screw 2, catoptron 3, sensor fibre 4, λ/4 optical-fibre wave plate 5, annular groove 6, oblique groove 7, panda protecting polarized light fiber 8.
Wherein the Main Function of λ/4 optical-fibre wave plate 5 changes the orthogonal linearly polarized light of two bundles into two bundle rotation directions contrary circularly polarized light, ellipse core polarization maintaining optical fibre is adopted to make, its making mainly contains two large difficult points, is the precise hard_drawn tuhes to shaft angle degree and ellipse core polarization maintaining optical fibre length respectively.Sensor fibre 4 adopts spin fiber and circular polarization to keep optical fiber, SPUN optical fiber, its principle of work is that circularly polarized light enters sensor fibre 4, in sensor fibre 4, due to the Faraday magneto-optic effect effect of current induced magnetic field in wire, the velocity of propagation of two bundle circularly polarized lights is different, thus produces Faraday difference.The Verdet constant with temperature change of sensor fibre 4 can impact the measuring accuracy of sensing ring, thus needs to take measures to suppress.
The Main Function of λ/4 optical-fibre wave plate 5 in described sensing ring changes the orthogonal linearly polarized light of two bundles into two bundle rotation directions contrary circularly polarized light, is one of Primary Component of sensing ring.Due to the impact of the factor such as manufacturing process and environmental change, will the non-ideal of wave plate be caused, thus introduce certain error, and then the measuring accuracy of transformer system and stability will be impacted.Be embodied in 2 points: the first, 45 ° of panda protecting polarized light fiber 8 and ellipse core polarization maintaining optical fibre 10 exist certain error to axle welding; Length and the phase delay angle of second, λ/4 optical-fibre wave plate 5 are difficult to precise hard_drawn tuhes.
Sensor fibre 4 in described sensing ring and catoptron 3 adopt the structural design of integration.Utilize chemical vapour deposition technique to plate deielectric-coating at the end face of sensor fibre one end, and adopt kapillary to carry out anti-steam protection, enhance the reliability of catoptron, and ensure that the reflectivity of catoptron is more than 95%.Comparing sensor fibre and catoptron is independently optical device, which reduces an optical fiber fusion welding point, effectively reduces optical path loss, avoid the impact that optical fiber fusion welding point brings to sensing ring reliability.
Described sensor fibre 4 adopts spin fiber and circular polarization to keep optical fiber, SPUN optical fiber, this optical fiber has good consistance, inner do not have to rotate the internal residual stresses caused, the pressure that fibre cladding produces has higher internal birefringence, effectively can offset other pressure or the bending polarization error produced, and be convenient to be coiled into various shape, make the sensing ring of different structure.
The method for making of sensing ring of the present invention make use of optical fiber current mutual inductor error self compensation technology.Concrete principle is as follows: under sensing ring is in varying temperature environment, and λ/4 optical-fibre wave plate and sensor fibre all can have an impact to the output of all-fiber current transformator, thus the measuring accuracy of influential system, be embodied in the scale factor change of mutual inductor:
Wherein, V
0the Verdet constant of sensor fibre when being 20 DEG C, the Verdet constant that V (T) is sensor fibre during T DEG C, δ (T) is to shaft angle degree for the phase delay of λ/4 optical-fibre wave plate during T DEG C, θ, generally gets 45 °.
At different temperatures, Verdet constant Changing Pattern is:
At different temperatures, Phase Retardation of Wave Plate Changing Pattern is:
δ(T)＝δ
0×[1+α(T-T
0)](3)
Wherein, δ
0for T
0the phase delay of wave plate during (20 DEG C) temperature, α is Phase Retardation of Wave Plate rate of temperature change, and α=-3.89 × 10
-4dEG C
-1.
Therefore, the proportional that all-fiber current transformator scale factor affects by sensor fibre Verdet constant is
the proportional affected by λ/4 optical-fibre wave plate is
from (1) (3) formula, it is linear relationship between the phase delay of λ/4 optical-fibre wave plate and temperature, and raise with temperature and reduce, in alternating temperature process, optical-fibre wave plate phase delay in λ/4 is greater than 90 ° all the time, then the scale factor of mutual inductor raises along with temperature and reduces; From (1) (2) formula, the Verdet constant of sensor fibre has positive temperature coefficient (PTC), raises and increase along with temperature, and the scale factor of mutual inductor also correspondingly raises with temperature and increases.Therefore, select the operation interval of the phase delay of suitable λ/4 optical-fibre wave plate, namely λ/4 optical-fibre wave plate of appropriate length is made, the impact making it change on the Verdet constant with temperature of the impact of mutual inductor scale factor and sensor fibre the mutual inductor scale factor caused is contrary, the two compensates mutually, thus reduce the scale factor error of mutual inductor, improve the measuring precision.
The method for making of high-accuracy all-fiber current transformer sensing ring of the present invention mainly comprises the precise manufacture method of λ/4 optical-fibre wave plate 5, the birefringence error of sensor fibre 4 suppresses and the overall package method of sensing ring.As shown in Figure 2, whole process adopts Teng storehouse Polarization Maintaining Optical Fiber Fusion Splicer to carry out manual fused fiber splice to sensing ring method for making schematic flow sheet.
All-fiber current transformator sensing ring method for making of the present invention, specifically, comprises the following steps:
(1) build the experimental detection device that λ/4 optical-fibre wave plate makes, the linearly polarized light of generation is as flashlight;
(2) tail optical fiber that panda protecting polarized light fiber one end and experimental detection device export light carries out 0 ° of welding;
As shown in Fig. 2 (a), build the experimental detection device that λ/4 optical-fibre wave plate 5 makes, what the tail optical fiber of SLD light source 11 was protected inclined circulator 12 with 0 ° of welding enters fibre, and ensures that its extinction ratio is greater than 35dB, polarization light output.To the tail optical fiber of inclined circulator 12 be protected using one end of 0 ° of welding panda protecting polarized light fiber 8 as input end, during welding, by the other end of panda protecting polarized light fiber 8 to be connected the input end of Polarization instrument 13 as output terminal, Real-Time Monitoring exports extinction ratio and the degree of polarization of light, manually dock by regulating the motor of heat sealing machine, when extinction ratio and degree of polarization all reach maximal value, carry out electric discharge welding.
(3) the panda protecting polarized light fiber other end and ellipse core polarization maintaining optical fibre one end carry out 45 ° to axle welding;
As shown in Figure 2 b, by the output terminal of panda protecting polarized light fiber 8 with 45 ° of one end to the ellipse core polarization maintaining optical fibre 10 of axle welding, first the output terminal of panda protecting polarized light fiber 8 is placed on the left side fixture of Polarization Maintaining Optical Fiber Fusion Splicer, one end of ellipse core polarization maintaining optical fibre 10 is placed on the right side fixture of Polarization Maintaining Optical Fiber Fusion Splicer, the input end of other end access Polarization instrument 13, Real-Time Monitoring exports extinction ratio and the degree of polarization of light, manually dock by regulating the motor of heat sealing machine, when extinction ratio reach minimum value close to 0 and degree of polarization all reaches maximal value time, carry out electric discharge welding.
(4) the ellipse core polarization maintaining optical fibre adopting intercept method to intercept certain length makes λ/4 optical-fibre wave plate, and row index of going forward side by side is tested;
As shown in Figure 2 c, λ/4 optical-fibre wave plate 5 is made by the ellipse core polarization maintaining optical fibre 10 of intercept method intercepting certain length.
The impact choosing the Verdet constant with temperature mainly needing consideration sensor fibre 4 of λ/4 optical-fibre wave plate 5 length.
The length will optical fiber current mutual inductor error self compensation know-why being utilized to determine to need the ellipse core polarization maintaining optical fibre 10 intercepted in step, i.e. the phase delay of control λ/4 optical-fibre wave plate 5.Concrete principle is: under sensing ring is in varying temperature environment, and λ/4 optical-fibre wave plate and sensor fibre all can have an impact to the output of all-fiber current transformator, thus the measuring accuracy of influential system, be embodied in the scale factor change of mutual inductor:
Wherein, V
0the Verdet constant of sensor fibre when being 20 DEG C, the Verdet constant that V (T) is sensor fibre during T DEG C, δ (T) is to shaft angle degree for the phase delay of λ/4 optical-fibre wave plate during T DEG C, θ, generally gets 45 °.
At different temperatures, Verdet constant Changing Pattern is:
At different temperatures, Phase Retardation of Wave Plate Changing Pattern is:
δ(T)＝δ
0×[1+α(T-T
0)](6)
Wherein, δ
0for T
0the phase delay of wave plate during (20 DEG C) temperature, α is Phase Retardation of Wave Plate rate of temperature change, and α=-3.89 × 10
-4dEG C
-1.
Therefore, from (4) (6) formula, it is linear relationship between the phase delay of λ/4 optical-fibre wave plate 5 and temperature, and raise with temperature and reduce, in alternating temperature process, the phase delay of λ/4 optical-fibre wave plate 5 is greater than 90 ° all the time, then the scale factor of mutual inductor raises along with temperature and reduces; From (4) (5) formula, the Verdet constant of sensor fibre 4 has positive temperature coefficient (PTC), raises and increase along with temperature, and the scale factor of mutual inductor also correspondingly raises with temperature and increases.Therefore, select the operation interval of the phase delay of suitable λ/4 optical-fibre wave plate 5, namely λ/4 optical-fibre wave plate 5 of appropriate length is made, the impact making it change on the Verdet constant with temperature of the impact of mutual inductor scale factor and sensor fibre 4 the mutual inductor scale factor caused is contrary, the two compensates mutually, thus reduce the scale factor error of mutual inductor, improve transformer system measuring accuracy.
Such as, by guaranteeing that the length of sensor fibre 4 is 25m, ensureing that the length of λ/4 optical-fibre wave plate 5 is 2.27mm, meeting initial phase δ
0=95 °, when temperature changes within the scope of-40 DEG C ~ 70 DEG C, when only having λ/4 optical-fibre wave plate 5 temperature influence, the error of the scale factor temperature influence of mutual inductor is 0.745%; When only having the Verdet constant temperature influence of sensor fibre 4, the error of the scale factor temperature influence of mutual inductor is-0.682%; When mutual inductor affects by both sensor fibre 4 and λ/4 optical-fibre wave plate 5 simultaneously, after both compensate mutually, the error of the scale factor temperature influence of mutual inductor is 0.106%, and compensation effect is remarkable.
As shown in Figure 2 c, the length of λ/4 optical-fibre wave plate 5 is drawn by formula (4) (5) (6) simulation calculation, the fixture of the panda protecting polarized light fiber 8 of good ellipse for welding core polarization maintaining optical fibre 10 is taken off from Polarization Maintaining Optical Fiber Fusion Splicer, the optical fiber cutter with micrometric displacement control gear is utilized to intercept the ellipse core polarization maintaining optical fibre 10 of required length, optical fiber cutter used makes based on specific Polarization Maintaining Optical Fiber Fusion Splicer, ensures that measuring accuracy is 10 μm.
Then detected phase delay and the degree of polarization of λ/4 optical-fibre wave plate 5 by Polarization instrument 13, phase delay during guarantee normal temperature is within the scope of 93.6 ° ~ 98.4 °, and degree of polarization is greater than 95%.If when 20 DEG C, the bat of ellipse core polarization maintaining optical fibre 10 is long is 8mm, then the length of λ/4 optical-fibre wave plate 5 needs to control at 2.13 ± 0.05mm; If when 20 DEG C, the bat of ellipse core polarization maintaining optical fibre 10 is long is 16mm, then the length of λ/4 optical-fibre wave plate 5 needs to control at 4.18 ± 0.05mm.
(5) if λ/4 optical-fibre wave plate meets the demands, carry out step 6, if do not meet the demands, repeat step 2 ~ 4;
(6) optical-fibre wave plate output terminal in λ/4 carries out 0 ° of welding with the sensor fibre input end with catoptron, and monitors the output signal of photodetector;
As shown in Figure 2 d; by λ/4 optical-fibre wave plate 5 output terminal made with the side of 0 ° of welding sensor fibre 4; wherein sensor fibre 4 and catoptron 3 adopt integrative packaging structure; utilize chemical vapour deposition technique to plate deielectric-coating at the end face of sensor fibre 4 one end, and adopt kapillary to carry out anti-steam protection.With reference to the pick-up unit that Fig. 2 d builds, detector 15 is connected with at the output terminal protecting inclined circulator 12, manually dock by regulating the motor of Polarization Maintaining Optical Fiber Fusion Splicer, the signal intensity of light is exported by detector 15 Real-Time Monitoring, when intensity reaches maximum, Polarization Maintaining Optical Fiber Fusion Splicer is carried out electric discharge welding.
(7) overall double-layer seal protection is carried out to λ/4 optical-fibre wave plate, sensor fibre and catoptron, and parallel discs is around on notched resin structure part base, carries out protecting and fixing;
As shown in Figure 3; in sensing ring, panda protecting polarized light fiber 8, λ/4 optical-fibre wave plate 5, sensor fibre 4 and catoptron 3 are after all welding completes; whole section of optical fiber is penetrated glass capillary 16; seal protection is carried out with ultra-violet curing glue respectively at two ends; protect with the high-temperature hot draw 17 outside glass capillary 16 again; and carry out heat curing, reach the effect of whole section of optical fiber in sensing ring being carried out to double shielding.The structural member upper cover 9 of sensing ring and base 1 all utilize fire resistant resin materials processing to make, and effectively can solve sensing ring on high-tension side Insulation Problems.As shown in Figure 1; structural member base 1 engraves the wide annular groove of 1.5cm 6 and the wide oblique groove 7 of 0.5cm respectively; by flat around in annular groove 6 for the whole section of optical fiber overlapped with double shielding; panda protecting polarized light fiber 8 passes from oblique groove 7; then in annular groove 6, fill ultra-violet curing glue whole section of optical fiber is cured, improve the reliability of sensing ring.Finally; structural member base 1 shown in structural member upper cover 9 shown in Fig. 4 and Fig. 1 is fixed by screw 2; and carry out seal protection at the gap ultra-violet curing glue at contact structure place, prevent sand and dust and steam from entering inner side, affect measuring accuracy and the reliability of sensing ring.
(8) high/low temperature circulation impact is carried out to sensing ring entirety, carry out steam drying and release inside of optical fibre stress;
After sensing ring entirety has been assembled, put it in incubator, make it in-40 ~ 80 DEG C of temperature ranges, carry out high/low temperature circulation, height warm spot is incubated 6 hours respectively, temperature rate 1 DEG C/min, carry out 4 ~ 6 high/low temperature circulation impacts, carry out the drying of sensing ring internal steam and inside of optical fibre stress relief, thus improve stability and the reliability of sensing ring.
Below, be the technology point needing in above-mentioned steps to carry out noting.
The experimental detection device that in step 1 of the present invention, λ/4 optical-fibre wave plate 5 makes mainly comprises super-radiance light emitting diode SLD light source 11, protects inclined circulator 12 and Polarization instrument 13.The light that SLD light source 11 sends, after protecting inclined circulator 12, becomes linearly polarized light, and as the flashlight of pick-up unit in sensing ring manufacturing process, wherein ensure that the extinction ratio of protecting inclined circulator 12 is greater than 35dB, the extinction ratio of output signal light is greater than 30dB.
Step 2 of the present invention adopts the mode of manual fused fiber splice to carry out fused fiber splice, and the tail optical fiber making panda protecting polarized light fiber 8 one end and experimental detection device export light carries out 0 ° of welding.Export extinction ratio and the degree of polarization of polarized light with Polarization 13 Real-Time Monitoring, welding of discharging when extinction ratio and degree of polarization reach maximal value, makes output light keep good polarization state characteristic.
Step 3 of the present invention adopts the method for manual optical fiber align that panda protecting polarized light fiber 8 other end and ellipse core polarization maintaining optical fibre 10 one end are carried out 45 ° to axle welding, Polarization instrument 13 Real-Time Monitoring is utilized to export extinction ratio and the degree of polarization of polarized light, when extinction ratio reach minimum close to 0dB and degree of polarization reaches maximum time electric discharge welding, 45 ° of accuracys to axle welding can be improved like this, reduce because wave plate is to the precision of shaft angle degree error effect sensing ring.
Step 4 of the present invention adopts intercept method to intercept the ellipse core polarization maintaining optical fibre 10 of appropriate length to make λ/4 optical-fibre wave plate 5, obtains required phase delay to make λ/4 optical-fibre wave plate 5.The high birefringence of described ellipse core polarization maintaining optical fibre 10 belongs to geometric type, and when alternating temperature, temperature performance is better than panda protecting polarized light fiber, and its phase delay temperature coefficient is-3.89 × 10
-4dEG C
-1.
Its principle is: owing to there is birefringence in ellipse core polarization maintaining optical fibre, when polarized light transmits in polarization maintaining optical fibre, the phase delay between two pattern is:
In formula: L
pthe bat being ellipse core polarization maintaining optical fibre is long, and z is the length intercepting optical fiber.
Thus, just can make λ/4 optical-fibre wave plate, obtain required phase delay.Because beat length of polarization maintaining optical fiber is shorter and not easily accurately measure, be generally 8 ~ 20mm, therefore when making, intercepted length is difficult to precise hard_drawn tuhes, may need repeatedly to carry out.
The present invention is according to above-mentioned all-fiber current transformator error self compensation know-why, and simulation calculation goes out required optical-fibre wave plate length.Utilize the optical fiber cutter 14 with micrometric displacement control gear to intercept the ellipse core polarization maintaining optical fibre 10 of required length, optical fiber cutter 14 used makes based on specific Polarization Maintaining Optical Fiber Fusion Splicer, and its measuring accuracy is 10 μm.Then detected phase delay and the degree of polarization of λ/4 optical-fibre wave plate by Polarization instrument 13, phase delay during guarantee normal temperature is within the scope of 93.6 ° ~ 98.4 °, and degree of polarization is greater than 95%.The Verdet constant of sensor fibre 4 so just effectively can be suppressed the impact of mutual inductor scale factor, improve the precision of sensing ring.
Optical-fibre wave plate 5 and sensor fibre 4, by the signal intensity of Real-Time Monitoring photodetector 15, are utilized the mode of manual fused fiber splice, guarantee that interference strength reaches maximum by step 6 of the present invention.Effectively reduce the loss that optical fiber fusion welding point brings to light path like this.
Step 7 of the present invention is passed through to carry out whole section of optical fiber double-layer seal protection to λ/4 optical-fibre wave plate 5, sensor fibre 4 and catoptron 3, as shown in Figure 3.Be less than the clean environment of 20% in humidity under, whole section of optical fiber is penetrated glass capillary 16, and utilize at two ends ultra-violet curing glue to carry out seal protection; Then protect at the glass capillary 16 skin high-temperature hot draw 17, and carry out pyrocondensation solidification, effectively improve the reliability of sensing ring.
Structural member base 1 and the upper cover 9 of sensing ring of the present invention adopt fire resistant resin material, efficiently solve sensing ring on high-tension side Insulation Problems.Be carved with the wide annular groove of 1.5cm 6 inside base, whole section of optical fiber after pyrocondensation being solidified is flat around in groove, and is solidified with ultra-violet curing glue, effectively improves the reliability of sensing ring.
Step 8 of the present invention is by putting into incubator by sensing ring, make it in-40 ~ 80 DEG C of temperature ranges, carry out high/low temperature circulation, height warm spot is incubated 6 hours respectively, temperature rate 1 DEG C/min, carry out 4 ~ 6 circulations, carry out the high and dry and inside of optical fibre stress relief of sensing ring internal steam, thus improve stability and the reliability of sensing ring.
Although be described in detail a kind of high-accuracy all-fiber current transformer sensing ring method for making of the present invention by above-described embodiment, but above-mentioned explanation is not limitation of the invention, without departing from the spirit and scope of the invention, various distortion and change can be carried out, such as, optimized method can be selected in the various methods of prior art.
Claims (8)
1. a high-accuracy all-fiber current transformer sensing ring method for making, is characterized in that, comprise the steps:
Step 1, build the experimental detection device that λ/4 optical-fibre wave plates makes, the linearly polarized light of generation is as flashlight;
The tail optical fiber that step 2, panda protecting polarized light fiber one end and experimental detection device export light carries out 0 ° of welding;
Step 3, the panda protecting polarized light fiber other end and ellipse core polarization maintaining optical fibre one end carry out 45 ° to axle welding;
Step 4, the ellipse core polarization maintaining optical fibre adopting intercept method to intercept designated length make λ/4 optical-fibre wave plate (5), the index test of line phase of going forward side by side delay and degree of polarization;
If step 5 λ/4 optical-fibre wave plate (5) satisfy specified requirement, carry out step 6, if do not meet the demands, repeat step 2 ~ 4;
Step 6, λ/4 optical-fibre wave plate (5) output terminal carry out 0 ° of welding with sensor fibre (4) input end with catoptron (3);
Step 7, overall double-layer seal protection is carried out to λ/4 optical-fibre wave plate (5), sensor fibre (4) and catoptron (3), and parallel discs is around on notched resin structure part base, carries out protecting and fixing;
Step 8, high/low temperature circulation impact is carried out to sensing ring entirety, carry out the dry and inside of optical fibre stress relief of steam.
2. a kind of high-accuracy all-fiber current transformer sensing ring method for making as claimed in claim 1, is characterized in that:
In step 1, described experimental detection device comprises: SLD light source (11), protect inclined circulator (12), Polarization instrument (13); What the tail optical fiber of SLD light source (11) was protected inclined circulator (12) with 0 ° of welding enters fibre, and the tail optical fiber protecting inclined circulator (12) produces linearly polarized light.
3. a kind of high-accuracy all-fiber current transformer sensing ring method for making as claimed in claim 1, is characterized in that:
In step 2, protect inclined circulator (12) using one end of 0 ° of welding panda protecting polarized light fiber (8) as input end, during welding, the other end of panda protecting polarized light fiber (8) is connected the input end of Polarization instrument (13) as output terminal, Real-Time Monitoring exports extinction ratio and the degree of polarization of light, by regulating the motor of heat sealing machine manually to dock, when extinction ratio and degree of polarization all reach maximal value, carry out electric discharge welding.
4. a kind of high-accuracy all-fiber current transformer sensing ring method for making as claimed in claim 1, is characterized in that:
In step 3, by the output terminal of panda protecting polarized light fiber (8) with 45 ° of one end to the ellipse core polarization maintaining optical fibre (10) of axle welding, first the output terminal of panda protecting polarized light fiber (8) is placed on the left side fixture of Polarization Maintaining Optical Fiber Fusion Splicer, one end of ellipse core polarization maintaining optical fibre (10) is placed on the right side fixture of Polarization Maintaining Optical Fiber Fusion Splicer, the input end of other end access Polarization instrument (13), Real-Time Monitoring exports extinction ratio and the degree of polarization of light, manually dock by regulating the motor of heat sealing machine, when extinction ratio reaches minimum value and degree of polarization reaches maximal value, carry out electric discharge welding.
5. a kind of high-accuracy all-fiber current transformer sensing ring method for making as claimed in claim 1, is characterized in that:
In step 4, with following formula for foundation intercepts,
Namely desired phase delay is:
In formula: L
pthe bat being ellipse core polarization maintaining optical fibre is long, and z is the length intercepting optical fiber.
6. a kind of high-accuracy all-fiber current transformer sensing ring method for making as claimed in claim 1, is characterized in that:
In step 6, during welding, by λ/4 optical-fibre wave plate (5) output terminal made with the side of 0 ° of welding sensor fibre (4), wherein sensor fibre (4) and catoptron (3) adopt integrative packaging structure, utilize chemical vapour deposition technique to plate deielectric-coating at the end face of sensor fibre (4) one end, and adopt kapillary carried out anti-steam protection obtain; Detector (15) is connected with at the output terminal protecting inclined circulator (12), manually dock by regulating the motor of Polarization Maintaining Optical Fiber Fusion Splicer, the signal intensity of light is exported by detector (15) Real-Time Monitoring, when intensity reaches maximum, Polarization Maintaining Optical Fiber Fusion Splicer is carried out electric discharge welding.
7. a kind of high-accuracy all-fiber current transformer sensing ring method for making as claimed in claim 1, is characterized in that:
In step 7, in sensing ring, panda protecting polarized light fiber (8), λ/4 optical-fibre wave plate (5), sensor fibre (4) and catoptron (3) are after all welding completes, whole section of optical fiber is penetrated glass capillary (16), seal protection is carried out with ultra-violet curing glue respectively at two ends, protect in glass capillary (16) the outside high-temperature hot draw (17) again, and carry out heat curing;
Structural member upper cover (9) and the base (1) of sensing ring utilize fire resistant resin materials processing to make, structural member base (1) engraves the wide annular groove of 1.5cm (6) and the wide oblique groove (7) of 0.5cm respectively, by flat around in annular groove (6) for the whole section of optical fiber overlapped with double shielding, panda protecting polarized light fiber (8) passes from oblique groove (7), in annular groove (6), then fills ultra-violet curing glue be cured by whole section of optical fiber;
Finally, structural member upper cover (9) and structural member base (1) are fixed by screw (2), and carry out seal protection at the gap ultra-violet curing glue at contact structure place.
8. a kind of high-accuracy all-fiber current transformer sensing ring method for making as claimed in claim 1, is characterized in that:
After sensing ring entirety has been assembled, put it in incubator, make it in-40 ~ 80 DEG C of temperature ranges, carry out high/low temperature circulation, height warm spot is incubated 6 hours respectively, temperature rate 1 DEG C/min, carry out 4 ~ 6 high/low temperature circulation impacts, carry out the drying of sensing ring internal steam and inside of optical fibre stress relief.
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