CN201935950U - High-accuracy all-fiber current transformer - Google Patents
High-accuracy all-fiber current transformer Download PDFInfo
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- CN201935950U CN201935950U CN2010206752466U CN201020675246U CN201935950U CN 201935950 U CN201935950 U CN 201935950U CN 2010206752466 U CN2010206752466 U CN 2010206752466U CN 201020675246 U CN201020675246 U CN 201020675246U CN 201935950 U CN201935950 U CN 201935950U
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Abstract
The utility model discloses a high-accuracy all-fiber current transformer. The current transformer comprises a light path system, a signal modulation-demodulation unit and an optical detector, wherein the light path system comprises a light source; the light source is connected with a depolarizer, a circulator, a polarizer, a phase modulator, a fiber delay line, a lambda/4 wave plate, a sensing fiber and a fiber reflector in turn; and the optical detector is connected with the signal modulation-demodulation unit. In the utility model, phase closed-loop control of the fiber current transformer is realized through the signal modulation-demodulation unit and the phase modulator, so that signal-to-noise ratio and anti-interference capacity of a system are greatly improved; an all-fiber structure and a closed-loop detection control loop are adopted, so that the reliability of the system is improved; and the spin fiber with ultra-low birefringence and high verdet constant is used as the sensing fiber, so that deflection error of polarized light in a light path conveying process is reduced. The current transformer can be widely applied to the field of power detection.
Description
Technical field
The utility model relates to a kind of current transformer, particularly a kind of all-fiber current transformator.
Background technology
Mutual inductor is the eyes of electric system, and voltage by the mutual inductor detection line or electric current are also realized isolation with primary equipment, cooperates functions such as the metering that realizes electric system, protection, observing and controlling simultaneously with secondary device.Traditional electromagnetic current transducer similar transformer, line wire is done winding one time, by the secondary coil of electromagnetic transfer being given short-circuit condition of silicon sheet core, the electric current that the secondary coil induction produces is cancelled out each other I with the electric current of primary winding generation in silicon sheet core
1* N
1=I
2* N
2Thereby, in secondary coil, induce the secondary current that is proportional to line current.Traditional electromagnetic current transducer is conductive medium with the silicon sheet core, except that the secondary current that induction produces with primary current is directly proportional, the effect of also bearing insulation, drive load, signal conducting, the type mutual inductor exists big, ferromagnetic saturated, the resonance of iron loss, insulation system complexity, precision to be subjected to problems such as load effect, open circuit high pressure, earth fault, electromagnetic interference (EMI), can not satisfy modern power systems primary system voltage height, capacity is big and the requirement of electrical secondary system microcomputerization, miniaturization, networking.
Active electronic transformer adopts the sensing head that does not contain iron core to check voltage or electric current, sample, transmit by optical fiber remote by the far-end acquisition module is local, realized that sensing separates with driving, insulation, transfer function, simplified the insulation system of mutual inductor, reduce the volume and weight of mutual inductor, improved the performance of mutual inductor.The shortcoming of active electronic transformer is: the power supply cost height of far-end acquisition module, electronic devices and components work under bad environment are aging easily, remote end module is positioned at high-pressure side interruption maintenance inconvenience.
The novel optical current mutual inductor based on the Fraday effect can address the above problem, and optical current mutual inductor can be divided into magneto-optic glass structure and all optical fibre structure on structure.Adopt the current transformer of magneto-optic glass structure to utilize the dense flint magneto-optic glass of high Field constant to make carrier, be subjected to the modulation of tested electric current when linearly polarized light is walked around therein and change deflection angle, make the analyzing device by wollaston prism again and realize that thereby the detection of deflection angle measures electric current indirectly, this scheme is an open loop mode, light path system adopts that independent optical device is bonding to form, optical device is subjected to machining precision easily, environment temperature, the influence of vibration, exist measurement range little, sensitivity is low, shortcomings such as long-time stability difference are difficult to satisfy the requirement of practicability; Another kind is an all optical fibre structure, the polarized light that transmits in sensitive optical fibre produces the phase differential that is directly proportional with magnetic field intensity, can detect the size that draws the electric current corresponding by the detected phase difference with magnetic field, but there is following defective in prior art: the first, the poor anti jamming capability of fibre optic phase modulator, and the sensitivity of system has much room for improvement; The second, the double refractive inde of sensor fibre is big, and is big to the influence of polarized light.
The utility model content
In order to solve above-mentioned technical matters, the purpose of this utility model provides a kind of high precision all-fiber current transformator.
The utility model is that the technical scheme that its technical matters of solution is adopted is:
The high precision all-fiber current transformator, comprise light path system and modulating and demodulating signal unit, described light path system comprises light source, described light source is connected with depolarizer in turn, circulator, the polarizer, phase-modulator, fibre delay line, λ/4 wave plates, sensor fibre, fiber reflector, described light source send light beam after the fiber reflection mirror reflection along sensor fibre, λ/4 wave plates, fibre delay line, phase-modulator, the polarizer is back to circulator, described circulator also is connected with photo-detector, the output terminal of described photo-detector is connected to the input end of modem module, and the output terminal of described modem module links to each other with phase-modulator and constitutes the closed loop phase control.
Be further used as preferred embodiment, described modulating and demodulating signal unit comprises prime amplifier, wave filter, the AD sampling unit, signal processing unit, the phase-locked depth modulation of numeral unit, the phase demodulating current calculation unit, electrooptic switching element, photoelectric conversion unit, signal generator, described signal processing unit comprises 1 frequency multiplication triangular function generator, 2 frequency multiplication triangular function generators, first multiplier, second multiplier, first totalizer, second totalizer, the frequency multiplication unit, the light beam of output converts the variation of voltage to through photo-detector, improve signal amplitude through prime amplifier, the unwanted higher hamonic wave of wave filter filtering, convert digital signal to through the high-precision A sampling unit then, described AD sampling unit converts electric synchronizing signal to after trigger after the frequency multiplication sampling unit frequency multiplication by synchronous input signal through photoelectric conversion unit, the digital signal of AD sampling unit output respectively with 1 frequency multiplication triangular function generator, 2 frequency multiplication triangular function generators multiply each other, first multiplier, the output signal of second multiplier is respectively through first totalizer, superimposed after second totalizer adds up, the signal one tunnel after the described stack is through the phase demodulating current calculation unit, electrooptic switching element is exported as current signal; Another road feeds back to phase-modulator through the phase-locked depth modulation of numeral unit, signal generator and constitutes the phase place closed-loop control, and described 1 frequency multiplication triangular function generator, 2 frequency multiplication triangular function generators, first multiplier, second multiplier, digital phase-locked depth modulation unit all link to each other with the electric synchronizing signal of photoelectric conversion unit respectively.
Be further used as preferred embodiment, described sensor fibre is ultralow birefraction, high Field constant spin fiber, and described spin fiber is closely rotated by single-mode fiber and forms.
The beneficial effects of the utility model are: the utility model has been realized phase place closed-loop control to optical fiber current mutual inductor by modulating and demodulating signal unit and phase-modulator, has improved the signal to noise ratio (S/N ratio) and the antijamming capability of system greatly; The utility model has adopted all optical fibre structure and closed loop to detect control loop, has improved the reliability of system; The utility model is done sensor fibre by adopting ultralow birefraction, high Field constant spin fiber, has reduced the offset error of polarized light in the optic path process.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the structure principle chart of the utility model optical fiber current mutual inductor;
Fig. 2 is the theory diagram of the utility model optical fiber current mutual inductor modulating and demodulating signal unit.
Embodiment
With reference to Fig. 1, the high precision all-fiber current transformator, comprise light path system and modulating and demodulating signal unit 9, described light path system comprises that light source 1, described light source 1 are connected with depolarizer 2, circulator 3, the polarizer 4, phase-modulator 5, fibre delay line 6, λ/4 wave plates 7, sensor fibre 8, fiber reflector 11 in turn, and described light source 1 sends light beam and enters the polarizer 4 through circulator 3 by depolarizer 2 after depolarized and become linearly polarized light; The tail optical fiber of the tail optical fiber of the polarizer 4 and phase-modulator 5 is with the 45 welding, and linearly polarized light just is split respectively along the fast axle of polarization maintaining optical fibre and the linearly polarized light of slow axis transmission two bundle orthogonal modess like this; Two bunch polarized lights are modulated into the trigonometric function waveform that light intensity is 500kHz during by phase-modulator 5, and after fibre delay line 6 is protected and entered λ/4 wave plates 7 partially and be transformed into left-handed and circularly polarized light dextrorotation, enter sensor fibre 8 simultaneously; Because thereby tested electric current makes this two bundles circularly polarized light produce phase change with different speed transmission to the Faraday magneto-optic effect of two-beam; At the end of sensor fibre fiber reflector 11 has been installed, two bundle circularly polarized lights (are that left-handed rotation becomes right-handed rotation through fiber reflector 11 reflection rear polarizer modes swap, right-handed rotation becomes left-handed rotation), and then pass sensor fibre 8, thereby the phase place that the Faraday effect produces doubles; Once more by behind λ/4 wave plates 7, recovery becomes linearly polarized light at two-beam, and 6 fast light of propagating of fibre delay line became along the slow axis propagation originally, and originally the light along the propagation of fibre delay line slow axis becomes along axle propagation soon; The light of propagating along the fast axle of fibre delay line, slow axis interferes after circulator 3 enters photodetection instrument 10 at the optical fiber polarizer 4 places respectively; Thereby modulating and demodulating signal unit 9 changes the size that tested electric current is measured in the variation that demodulates the two-beam phase place according to light intensity, modulating and demodulating signal circuit 11 carries out closed-loop control according to characteristic quantity to the depth of modulation of phase-modulator 5, assurance system long-term stability simultaneously.
Be further used as preferred embodiment, described modulating and demodulating signal unit 9 comprises prime amplifier 91, wave filter 92, AD sampling unit 93, signal processing unit 94, the phase-locked depth modulation of numeral unit 95, phase demodulating current calculation unit 96, electrooptic switching element 97, photoelectric conversion unit 98, signal generator 99, described signal processing unit 94 comprises 1 frequency multiplication triangular function generator 941,2 frequency multiplication triangular function generators 942, first multiplier 943, second multiplier 944, first totalizer 945, second totalizer 946, frequency multiplication unit 947, the light beam of output converts the variation of voltage to through photo-detector 10, improve signal amplitude through prime amplifier 91, the unwanted higher hamonic wave of wave filter 92 filterings, convert digital signal to through high-precision A sampling unit 93 then, described AD sampling unit 93 converts electric synchronizing signal to after trigger after frequency multiplication sampling unit 947 frequencys multiplication by synchronous input signal through photoelectric conversion unit 98, the digital signal of AD sampling unit 93 output respectively with 1 frequency multiplication triangular function generator 941,2 frequency multiplication triangular function generators 942 multiply each other, first multiplier 943, the output signal of second multiplier 944 is respectively through first totalizer 945, it is superimposed after second totalizer 946 adds up, signal one tunnel after the described stack can obtain the phase value of current time after phase demodulating current calculation unit 96 is done Fourier's computing, thereby can calculate the current value in this moment, through electrooptic switching element 97 with light digital form output current value at that time; Another road feeds back to phase-modulator 5 through the phase-locked depth modulation of numeral unit 95, signal generator 99 and constitutes the phase place closed-loop control, whether the depth of modulation of judging phase-modulator 5 according to the eigenwert of superposed signal changes, and is then dynamically adjusted the depth of modulation of signal generator 99 by the phase-locked depth adjustment of numeral unit 95 if change.Described 1 frequency multiplication triangular function generator, 941,2 frequency multiplication triangular function generators 942, first multiplier 943, second multiplier 944, digital phase-locked depth modulation unit 95 all link to each other with the electric synchronizing signal of photoelectric conversion unit 98 respectively.
Be further used as preferred embodiment, described sensor fibre 8 is ultralow birefraction, high Field constant spin fiber, described spin fiber is closely rotated by single-mode fiber and forms, and can reduce anisotropy greatly, thereby can drop to the double refractive inde of the circularly polarized light of sensor fibre minimum.
Be further used as preferred embodiment, the signal that described signal generator 99 produces is the 500KHz sine wave signal.
Be further used as preferred embodiment, the frequency of the electric synchronizing signal of described frequency multiplication sampling unit 947 outputs is 8MHz.
Be further used as preferred embodiment, the comprehensive output formula of the light that light source 1 sends after electric current to be measured and phase-modulator 5 modulation is:
Wherein, δ is a depth of modulation; φ is the initial phase of signal generator 99 modulation signals; φ=4NVI is the phase shift that electric current causes, N is the optical fiber number of turns, and V is the Field coefficient, I
0Be light source intensity, I (t) is by the real-time light intensity after phase-modulator and the current-modulation to be measured.After pressing the Bei Saier functional expansion, be divided into the combination of a plurality of N order components:
I(t)＝Jn(1，δ)·sin(Φ)·sin(2·π·Ω·t+φ)*I0
+Jn(2，δ)·cos(Φ)·cos(4·π·Ω·t+2·φ)*I0
+·····
Can learn that by following formula each order component output intensity all is subjected to light source intensity I
0, depth of modulation 6 influence, be not suitable for directly calculating the phase shift φ that tested electric current causes, thereby calculate tested electric current; When calculating tested electric current, be divided by and eliminate light source intensity I by second order light intensity and single order light intensity
0Influence; The depth of modulation δ of the 500KHz that produces by digital phase-locked depth adjustment unit 95 dynamic adjustments signal generators 99 can guarantee the stability of system accuracy in addition.
The synchronizing signal that links to each other with the input end of photoelectric conversion unit 98 in the utility model is the synchronous pulse per second (PPS) of GPS or the sampling pulse signal of transformer station.
More than be that preferable enforcement of the present utility model is specified, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of the utility model spirit, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (3)
1. high precision all-fiber current transformator, it is characterized in that: comprise light path system and modulating and demodulating signal unit (9), described light path system comprises light source (1), described light source (1) is connected with depolarizer (2) in turn, circulator (3), the polarizer (4), phase-modulator (5), fibre delay line (6), λ/4 wave plates (7), sensor fibre (8), fiber reflector (11), described light source (1) send light beam after fiber reflector (11) reflection along sensor fibre (8), λ/4 wave plates (7), fibre delay line (6), phase-modulator (5), the polarizer (4) is back to circulator (3), described circulator (3) also is connected with photo-detector (10), the output terminal of described photo-detector (10) is connected to the input end of modem module (9), and the output terminal of described modem module (9) links to each other with phase-modulator (5) and constitutes the closed loop phase control.
2. high precision all-fiber current transformator according to claim 1, it is characterized in that: described modulating and demodulating signal unit (9) comprises prime amplifier (91), wave filter (92), AD sampling unit (93), signal processing unit (94), numeral phase-locked depth modulation unit (95), phase demodulating current calculation unit (96), electrooptic switching element (97), photoelectric conversion unit (98), signal generator (99), described signal processing unit (94) comprises 1 frequency multiplication triangular function generator (941), 2 frequency multiplication triangular function generators (942), first multiplier (943), second multiplier (944), first totalizer (945), second totalizer (946), frequency multiplication unit (947), the light beam of output converts the variation of voltage to through photo-detector (10), improve signal amplitude through prime amplifier (91), the unwanted higher hamonic wave of wave filter (92) filtering, convert digital signal to through high-precision A sampling unit (93) then, described AD sampling unit (93) converts electric synchronizing signal to after trigger after frequency multiplication sampling unit (947) frequency multiplication by synchronous input signal through photoelectric conversion unit (98), the digital signal of AD sampling unit (93) output respectively with 1 frequency multiplication triangular function generator (941), 2 frequency multiplication triangular function generators (942) multiply each other, first multiplier (943), the output signal of second multiplier (944) is respectively through first totalizer (945), superimposed after second totalizer (946) adds up, the signal one tunnel after the described stack is through phase demodulating current calculation unit (96), electrooptic switching element (97) is exported as current signal; Another road through the phase-locked depth modulation of numeral unit (95), signal generator (99) feeds back to phase-modulator (5) and constitutes the phase place closed-loop control, described 1 frequency multiplication triangular function generator (941), 2 frequency multiplication triangular function generators (942), first multiplier (943), second multiplier (944), digital phase-locked depth modulation unit (95) all link to each other with the electric synchronizing signal of photoelectric conversion unit (98) respectively.
3. high precision all-fiber current transformator according to claim 1 is characterized in that: described sensor fibre (8) is ultralow birefraction, high Field constant spin fiber, and described spin fiber is closely rotated by single-mode fiber and forms.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106010795A CN102087307B (en) | 2010-12-22 | 2010-12-22 | High precision full optical fiber current mutual inductor |
| CN2010206752466U CN201935950U (en) | 2010-12-22 | 2010-12-22 | High-accuracy all-fiber current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106010795A CN102087307B (en) | 2010-12-22 | 2010-12-22 | High precision full optical fiber current mutual inductor |
| CN2010206752466U CN201935950U (en) | 2010-12-22 | 2010-12-22 | High-accuracy all-fiber current transformer |
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| CN201935950U true CN201935950U (en) | 2011-08-17 |
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| CN2010206752466U Expired - Fee Related CN201935950U (en) | 2010-12-22 | 2010-12-22 | High-accuracy all-fiber current transformer |
| CN2010106010795A Expired - Fee Related CN102087307B (en) | 2010-12-22 | 2010-12-22 | High precision full optical fiber current mutual inductor |
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| CN102087307A (en) * | 2010-12-22 | 2011-06-08 | 广东中钰科技有限公司 | High precision full optical fiber current mutual inductor |
| CN102628884A (en) * | 2012-03-29 | 2012-08-08 | 扬州永阳光电科贸有限公司 | Closed-loop optical fiber current transformer |
| CN105301319A (en) * | 2015-10-20 | 2016-02-03 | 浙江大学 | Mode-locked laser type all-fiber current transformer |
| CN107807267A (en) * | 2017-12-11 | 2018-03-16 | 中国南方电网有限责任公司超高压输电公司 | A kind of all-fiber current transformator for extra-high voltage direct-current field |
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2010
- 2010-12-22 CN CN2010206752466U patent/CN201935950U/en not_active Expired - Fee Related
- 2010-12-22 CN CN2010106010795A patent/CN102087307B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102087307A (en) * | 2010-12-22 | 2011-06-08 | 广东中钰科技有限公司 | High precision full optical fiber current mutual inductor |
| CN102628884A (en) * | 2012-03-29 | 2012-08-08 | 扬州永阳光电科贸有限公司 | Closed-loop optical fiber current transformer |
| CN102628884B (en) * | 2012-03-29 | 2017-01-18 | 扬州永阳光电科贸有限公司 | Closed-loop optical fiber current transformer |
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| CN105301319B (en) * | 2015-10-20 | 2018-01-09 | 浙江大学 | A kind of mode-locked laser type all-fiber current transformator |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102087307B (en) | 2012-05-30 |
| CN102087307A (en) | 2011-06-08 |
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