CN103869135A - All-fiber current transformer with dual-protection function - Google Patents
All-fiber current transformer with dual-protection function Download PDFInfo
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- CN103869135A CN103869135A CN201410110343.3A CN201410110343A CN103869135A CN 103869135 A CN103869135 A CN 103869135A CN 201410110343 A CN201410110343 A CN 201410110343A CN 103869135 A CN103869135 A CN 103869135A
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Abstract
An all-fiber current transformer with a dual-protection function comprises a sensing head, and is characterized in that the sensing head comprises a first sensing optical fiber and a second sensing optical fiber, wherein the tail ends of the first sensing optical fiber and the second sensing optical fiber are respectively connected with a reflecting mirror, the first sensing optical fiber and the second sensing optical fiber are used for achieving sensing while respectively surrounding a cable to be measured, the first sensing optical fiber is connected with a first digital demodulation module, the second sensing optical fiber is connected with a second digital demodulation module, and the first digital demodulation module and the second digital demodulation module are connected with a main spare switching control module, so that switching of output is achieved. Compared with an existing all-fiber current transformer, the all-fiber current transformer with the dual-protection function uses the dual-protection function, when one sensing optical fiber can not carry out measurement accurately or can not work normally, the other sensing optical fiber is switched on for measurement, the sensing head does not need to be overhauled or installed again, the whole current transformer can work stably for a long time under bad conditions like rapid change of temperature, and therefore the loss and maintenance cost cased by abnormal work of the all-fiber current transformer are largely reduced.
Description
Technical field
The present invention relates to optical current mutual inductor, refer to particularly a kind of all-fiber current transformator with two defencive functions.
Background technology
Along with electric system is to large capacity, UHV (ultra-high voltage) and extra-high voltage future development, more and more higher to the requirement of power equipment miniaturization, intellectuality and high reliability.At present in electric system widespread use be conventional electromagnetic type electric current, voltage transformer (VT) or capacitance type sensor, because system voltage increases, cause the insulation system complexity of mutual inductor, volume increases, cost also increases; Simultaneously electromagnetic transformer also exists the shortcomings such as magnetic saturation, ferroresonance, dynamic range be little, has been difficult to meet the demand for development of electric system.
New-style electronic mutual inductor has advantages of compact conformation, little, the anti-electromagnetic interference (EMI) of volume, unsaturated and be easy to digital data transmission, comply with the demand for development of power engineering, particularly, along with the generally application of GIS, HGIC and the construction of ultra-high voltage transformer station, the practice of electronic mutual inductor in engineering application is particularly important.Along with the development of the electronic type voltage based on optics and electronics principle, current transformer technology, conventional simulation signal and control cables will progressively be replaced by photoelectric figure signal and optical fiber in recent years.All-fiber current transformator is compared with traditional electromagnetic current transducer, have many advantages: all-fiber current transformator measure linear degree and accuracy are high, dynamic range is large, frequency response is wide, good insulating, its inside is not oil-filled, naked gas, good environmental protection, meet earthquake resistant level; All-fiber current transformator is safe and reliable, and power consumption in service is little, and all application scenarios, especially UHV (ultra-high voltage) that the scope of application has contained electromagnetic transformer require high occasion as 750KV electrical network and to precision and transient characterisitics; Meanwhile, all-fiber current transformator volume is little, lightweight, save transport and installation cost, is adapted at that compact transformer station maybe needs transformation but uses in the reconstruction project of limited space; 220KV all-fiber current transformator is slightly lower than conventional current mutual inductor price, and 500KV all-fiber current transformator price, significantly lower than conventional current mutual inductor, has very high economic benefit, is well suited for the development trend of electric power digital and robotization.
The structure of existing all-fiber current transformator is as shown in Fig. 1 of Figure of description part, wherein quarter wave plate, sensor fibre and reverberator form sensing head part, the principle of work of this all-fiber current transformator is roughly: the light that light source sends is through coupling mechanism, after the polarizer, become again linearly polarized light, linearly polarized light is injected into the fast of polarization maintaining optical fibre through 45 ° of optical fiber fusing points, slow axis, the orthogonal linearly polarized light of two bundles enters Transmission Fibers after phase-modulator modulation, be converted to the orthogonal circularly polarized light of two bundles and enter sensor fibre by quarter wave plate, under magnetic fields, between two bundle circularly polarized lights, produce the phase differential that is proportional to tested electric current, after catoptron reflection, two bundle circularly polarized light Yan Yuan roads are returned, phase differential doubles simultaneously, and (linearly polarized light originally transmitting along the fast axle of polarization maintaining optical fibre now transmits along slow axis to be again converted to two bundle modes swap by quarter wave plate, originally along the linearly polarized light of polarization maintaining optical fibre slow axis transmission now along fast axle transmission) orhtogonal linear polarizaiton light, two bunch polarized lights finally interfere at 45 ° of fusing point places, after analyzer analyzing, finally interference information detected by detector, complete its whole course of work through signal processing.
Although all-fiber current transformator has numerous advantages of aforementioned more traditional electromagnetic transformer, but because often existing temperature, the practical application of all-fiber current transformator the mal-condition such as sharply changes, so actual measuring accuracy is often subject to environmental impact, once and be damaged, to lose measurement data, cause maintenance, the reinstallation cost of mutual inductor sensing head.
Summary of the invention
Technical matters to be solved by this invention is just to provide a kind of all-fiber current transformator with two defencive functions; there is two-way sensor fibre; can Yi road can not Measurement accuracy or switch to another road when cisco unity malfunction and measure; without its sensing head is overhauled, and then greatly reduce loss and the maintenance cost that all-fiber current transformator operation irregularity causes.
For solving the problems of the technologies described above, a kind of all-fiber current transformator with two defencive functions provided by the invention, comprise sensing head, its special feature is: described sensing head comprises that tail end is connected with respectively the first sensor fibre and second sensor fibre of catoptron, realizes sensing outward for being looped around respectively cable to be measured; The first sensor fibre is connected with the first digital demodulation module, and the second sensor fibre is connected with the second digital demodulation module, and the first digital demodulation module is connected with masterslave switchover control module with the second digital demodulation module, for realizing the switching of output.
In technique scheme, described all-fiber current transformator also comprises distributed temperature measuring system, distributed temperature measuring system comprises the first temperature-measuring optical fiber and light source thereof, signal receiving module, signal processing module, and the second temperature-measuring optical fiber and light source thereof, signal receiving module, signal processing module; The first temperature-measuring optical fiber and described the first sensor fibre are parallel to be arranged, and the second temperature-measuring optical fiber and described the second sensor fibre are parallel to be arranged.
Further, the signal processing module output terminal of described the first temperature-measuring optical fiber is connected with the first digital demodulation module and the second digital demodulation module respectively, and the signal processing module output terminal of the second temperature-measuring optical fiber is connected with the first digital demodulation module and the second digital demodulation module respectively.
In technique scheme, described sensing head comprises ringwise sensing head housing, in sensing head housing, have two groups of annular grooves, be respectively used to hold described the first sensor fibre (or parallel the first sensor fibre, first temperature-measuring optical fiber arranging) and the second sensor fibre (or parallel the second sensor fibre, second temperature-measuring optical fiber arranging), two groups of annular groove tail end places of sensing head housing are respectively equipped with catoptron groove, be used for holding described catoptron, the side of sensing head housing is provided with perforate, for drawing of optical fiber.
Compared with aforementioned existing all-fiber current transformator, beneficial effect of the present invention is: utilized two protection structures, Yi road sensor fibre can not Measurement accuracy or be can switch to another road when cisco unity malfunction and measure, and without sensing head is overhauled and reinstalled, make whole current transformer the stable for extended periods of time work under mal-condition such as sharply change in temperature, thereby greatly reduce loss and the maintenance cost that all-fiber current transformator operation irregularity causes; Further, the setting of distributed temperature measuring system, in the situation that not affecting mutual inductor insulativity, temperature information that can Real-time Obtaining two-way sensor fibre, these temperature datas can be used for utilizing external circuit to realize compensation of error that temperature variation causes, make final current measurement result more accurate; Aim at the setting of the sensing head housing that has two groups of annular grooves of two-way (group) sensor fibre design, be convenient to assembling and the use of sensing head.
Brief description of the drawings
Fig. 1 is structure and the fundamental diagram of existing all-fiber current transformator.
Fig. 2 is the sensing head inner structure schematic diagram of all-fiber current transformator of the present invention.
Fig. 3 is fundamental diagram of the present invention.
In figure: the 1-the first sensor fibre, the 2-the first temperature-measuring optical fiber, the 3-the second sensor fibre, the 4-the second temperature-measuring optical fiber, 5-catoptron, 6-sensing head housing, 7-annular groove.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
Fig. 1 has illustrated structure and the principle of work thereof of existing all-fiber current transformator, because being described in detail in background technology part, repeats no more in this.
As shown in Figures 2 and 3, a kind of all-fiber current transformator with two defencive functions of the present invention, comprises sensing head and distributed temperature measuring system, and other structure is similar to existing all-fiber current transformator.Its sensing head comprises ringwise sensing head housing 6, has two groups of annular grooves 7 in sensing head housing 6, and two groups of annular grooves, the 7 tail end places of sensing head housing 6 are respectively equipped with catoptron groove, and the side of sensing head housing 6 is provided with perforate.Sensing head also comprises that tail end is connected with respectively the first sensor fibre 1 and second sensor fibre 5 of catoptron 5, the two is low birefringent fiber, the first sensor fibre 1 is connected with the first digital demodulation module through photodetector, amplifier and analog-to-digital conversion module successively, the second sensor fibre 5 is connected with the second digital demodulation module through photodetector, amplifier and analog-to-digital conversion module successively, the first digital demodulation module is connected with masterslave switchover control module with the second digital demodulation module, can be used for realizing the switching of output.Distributed temperature measuring system comprises the first temperature-measuring optical fiber 2 and light source thereof, signal receiving module, signal processing module, and the second temperature-measuring optical fiber 4 and light source thereof, signal receiving module, signal processing module.The first temperature-measuring optical fiber 2 walks abreast and arranges with aforementioned the second sensor fibre 3 with the parallel setting of aforementioned the first sensor fibre 1, the second temperature-measuring optical fiber 4, is respectively used to measure the temperature of two sensor fibres.The signal processing module output terminal of the first temperature-measuring optical fiber 2 is connected with the first digital demodulation module and the second digital demodulation module respectively, and the signal processing module output terminal of the second temperature-measuring optical fiber 4 is also connected with the first digital demodulation module and the second digital demodulation module respectively.The first sensor fibre 1 and the first temperature-measuring optical fiber 2 are coiled in one group of annular groove 7 of sensing head housing 6, the second sensor fibre 3 and the second temperature-measuring optical fiber 4 are coiled in another group annular groove 7 of sensing head housing 6, two catoptrons 5 are placed in catoptron groove, two groups totally four optical fiber draw from the perforate of sensing head housing 6 sides.
When work, the data processing section of the first digital demodulation module and second this device of digital demodulation module composition, process respectively the light signal that two catoptrons 5 reflect, receive the temperature signal of two temperature-measuring optical fibers 2,4 simultaneously, digital demodulation module judges whether temperature sensing part (temperature-measuring optical fiber and light source thereof, signal receiving module, signal processing module) normally works, if a certain road temperature sensing part due to damage or other reason cause signal error, switched to the data of another road temperature sensing part by digital demodulation module; The output of masterslave switchover control module for switching the first digital demodulation module and the second digital demodulation module, if a certain railway digital demodulation module cisco unity malfunction, just switching to another road second digital demodulation module by masterslave switchover control module exports, therefore improve the reliability of whole current transformer, and extended the serviceable life of current transformer.Digital demodulation module also can utilize external circuit to realize compensation of error that temperature variation causes, the measuring accuracy of current transformer is improved.
Claims (5)
1. one kind has the all-fiber current transformator of two defencive functions, comprise sensing head, it is characterized in that: described sensing head comprises that tail end is connected with respectively the first sensor fibre (1) and second sensor fibre (3) of catoptron (5), realizes sensing outward for being looped around respectively cable to be measured; The first sensor fibre (1) is connected with the first digital demodulation module, and the second sensor fibre (3) is connected with the second digital demodulation module, and the first digital demodulation module is connected with masterslave switchover control module with the second digital demodulation module, for realizing the switching of output.
2. the all-fiber current transformator with two defencive functions according to claim 1, it is characterized in that: described all-fiber current transformator also comprises distributed temperature measuring system, distributed temperature measuring system comprises the first temperature-measuring optical fiber (2) and light source thereof, signal receiving module, signal processing module, and the second temperature-measuring optical fiber (4) and light source thereof, signal receiving module, signal processing module; The first temperature-measuring optical fiber (2) arranges with described the first sensor fibre (1) is parallel, and the second temperature-measuring optical fiber (4) arranges with described the second sensor fibre (3) is parallel.
3. the all-fiber current transformator with two defencive functions according to claim 2; it is characterized in that: the signal processing module output terminal of described the first temperature-measuring optical fiber (2) is connected with the first digital demodulation module and the second digital demodulation module respectively, the signal processing module output terminal of the second temperature-measuring optical fiber (4) is connected with the first digital demodulation module and the second digital demodulation module respectively.
4. the all-fiber current transformator with two defencive functions according to claim 1; it is characterized in that: described sensing head comprises ringwise sensing head housing (6); in sensing head housing (6), have two groups of annular grooves (7); be respectively used to hold described the first sensor fibre (1) and the second sensor fibre (3); two groups of annular grooves (7) tail end place of sensing head housing (6) is respectively equipped with catoptron groove; be used for holding described catoptron (5); the side of sensing head housing (6) is provided with perforate, for drawing of optical fiber.
5. according to the all-fiber current transformator with two defencive functions described in claim 2 or 3, it is characterized in that: described sensing head comprises ringwise sensing head housing (6), in sensing head housing (6), have two groups of annular grooves (7), be respectively used to hold parallel the first sensor fibre (1) and the first temperature-measuring optical fiber (2) and the second sensor fibre (3) and the second temperature-measuring optical fiber (4) arranging, two groups of annular grooves (7) tail end place of sensing head housing (6) is respectively equipped with catoptron groove, be used for holding described catoptron (5), the side of sensing head housing (6) is provided with perforate, for drawing of optical fiber.
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| CN201410110343.3A CN103869135A (en) | 2014-03-24 | 2014-03-24 | All-fiber current transformer with dual-protection function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104237596A (en) * | 2014-08-27 | 2014-12-24 | 易能乾元（北京）电力科技有限公司 | Collecting device with optical fiber protecting function, full-optical-fiber current transformer and mounting method |
| CN104635010A (en) * | 2015-02-06 | 2015-05-20 | 宁波永耀信息科技有限公司 | All-fiber optical current transformer detection system |
| CN107037253A (en) * | 2017-05-09 | 2017-08-11 | 山东电力设备有限公司 | A kind of all-fiber current transformator sensing head |
| 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 |
| CN115144638A (en) * | 2022-09-06 | 2022-10-04 | 安徽省国盛量子科技有限公司 | Quantum current transformer based on single light path excitation multi-quantum dot technology |
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| CN107037253A (en) * | 2017-05-09 | 2017-08-11 | 山东电力设备有限公司 | A kind of all-fiber current transformator sensing head |
| 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 |
| CN115144638A (en) * | 2022-09-06 | 2022-10-04 | 安徽省国盛量子科技有限公司 | Quantum current transformer based on single light path excitation multi-quantum dot technology |
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