CN104316745B - Optical electronic type voltage transformer based on Faraday magneto-optic current measurement - Google Patents
Optical electronic type voltage transformer based on Faraday magneto-optic current measurement Download PDFInfo
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- CN104316745B CN104316745B CN201410670936.5A CN201410670936A CN104316745B CN 104316745 B CN104316745 B CN 104316745B CN 201410670936 A CN201410670936 A CN 201410670936A CN 104316745 B CN104316745 B CN 104316745B
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Abstract
The invention discloses an optical electronic type voltage transformer based on Faraday magneto-optic current measurement. The optical electronic type voltage transformer is characterized by comprising an electrical loop module and an optical measurement loop module; the electrical loop module comprises a main reactor and a sampling coil which are sequentially connected; the optical measurement loop module comprises an optical fiber ring, a collector and a merging unit, wherein the optical fiber ring, the collector and the merging unit are sequentially connected; the sampling coil is wound around the optical fiber ring by multiple circles. The optical electronic type voltage transformer has the advantages that the accuracy level is greatly improved due to the fact that the optical electronic type voltage transformer is implemented with the current measurement principle; as direct contact with an electrical loop does not exist, the electro-optic or magneto-optic principle is used, influences of interference of an electromagnetic loop are avoided, and the optical electronic type voltage transformer has the large technical advantages in the small signal transmission field of electronic type transformers.
Description
Technical field
The present invention relates to a kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, belong to intelligent substation optical electron formula voltage transformer technical field.
Background technology
High voltage potential transformer is the visual plant in electrical network, safety, stability and the reliability of its runnability direct relation power system.Compared with conventional voltage transformer, the advantages such as electronic type voltage transformer is simple with insulation, volume is little, lightweight, response fast, safety are the most increasingly by the concern widely of people, and electricity electronic type voltage transformer directly measures its small-signal after typically using capacitance partial pressure, inductance dividing potential drop, electric resistance partial pressure.And optical electron formula voltage transformer is because its anti-electromagnetic interference capability is paid attention to without advantages such as electrical links the most widely with major loop by force.Have optical voltage transformer in the world and put into on-the-spot trail run, the domestic research work the most in succession having carried out this respect.At present, the optical electron formula voltage transformer with practical application foreground is mainly based upon BGO(Bi4Ge3O12) the body modulation type optical voltage transformer of crystal Pockels effect.But, optical electron formula voltage transformer based on Pockels effect also exists spatial field strong jamming and temperature stability issues always, this seriously inhibits the practicalization of optical voltage transformer.And use the optical electron formula current transformer of Faraday magneto-optical principle because having obtained substantial amounts of engineer applied in its technical advantage power system.
So from the point of view of current present situation, the method using the optical current detection of Faraday magneto-optical principle indirectly to measure main circuit voltage will be the important research direction of future optical electronic type voltage transformer.
Summary of the invention
For solving the deficiencies in the prior art, it is an object of the invention to provide a kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, the drawback in terms of current optical electron formula current transformer stability and certainty of measurement can be efficiently solved.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that:
A kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, is characterized in that, including electric loop module and optical measurement return circuit module；Described electric loop module includes principal reactance and the sample coil being sequentially connected with；Described optical measurement return circuit module includes fiber optic loop, harvester and the combining unit being sequentially connected with；Described sample coil multiple-turns wound is in fiber optic loop.
Aforesaid a kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, is characterized in that, be provided with protective reactance between described principal reactance and sample coil.
Aforesaid a kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, is characterized in that, the number of turn of described sample coil is more than 2000.
Aforesaid a kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, is characterized in that, described harvester includes testing circuit unit, modulator loop unit and computing module unit.
Aforesaid a kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, is characterized in that, be provided with transmission data module in described combining unit.
Aforesaid a kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement, is characterized in that, described fiber optic loop is current sensor.
The beneficial effect that the present invention is reached: the optical voltage transformer utilizing current measurement principle to realize substantially increases the accuracy class of optical electron formula transformer.Optical electron formula transformer because its directly contacting without electric loop, utilization be electric light or magneto-optic principle is not disturbed by electromagnetic circuit and is affected, at electronic mutual inductor small-signal transmission field, there is the biggest technical advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
The implication of reference in figure:
1-principal reactance, 2-protective reactance, 3-sample coil, 4-fiber optic loop, 5-harvester, 6-combining unit.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
High voltage potential transformer is the visual plant in electrical network, safety, stability and the reliability of its runnability direct relation power system.Compared with conventional voltage transformer, electronic type voltage transformer is simple with insulation, volume is little, lightweight, respond the advantages such as fast, safety the most increasingly by the concern widely of people.Electricity electronic type voltage transformer directly measures its small-signal after typically using capacitance partial pressure, inductance dividing potential drop, electric resistance partial pressure, and optical electron formula voltage transformer is because its anti-electromagnetic interference capability is paid attention to without advantages such as electrical links the most widely with major loop by force.
At present, the optical electron formula voltage transformer with practical application foreground is mainly based upon BGO(Bi4Ge3O12) the body modulation type optical voltage transformer of crystal Pockels effect.But optical electron formula voltage transformer based on Pockels effect also exists spatial field strong jamming and temperature stability issues always.Document: the analysis [J] of Fiber-Optic Voltage stability (Luo Sunan, Ye Miaoyuan, Xu Yan. Proceedings of the CSEE.
2000,20 (12): 15-19.) describe the optical crystal of optical electron formula its sensing head of voltage transformer, light channel structure, insulation system, light source are affected by operating ambient temperature.Existing pertinent literature has the application of optical electron formula voltage transformer scene is proposed corresponding technical solution, these measures are all to solve, due to the shortcoming of Pockels effect itself, to produce little effect and this seriously inhibits the practicalization of optical electron formula voltage transformer from the point of view of on-the-spot applicable cases from technological angle.
And use the optical electron formula current transformer of Faraday magneto-optical principle because all there is bigger advantage in its technical the most either its steady state measurement precision or its transient measuring precision, optical electron formula voltage transformer involved in the present invention is mainly by using Faraday magnetooptical effect measurement voltage transformer main circuit current indirectly to measure its primary voltage, including electric loop module and optical measurement return circuit module.
Such as Fig. 1, electric loop module includes the main electricity being sequentially connected with, 1 and sample coil 3.Optical measurement return circuit module includes fiber optic loop 4, harvester 5 and the combining unit 6 being sequentially connected with.
Owing to typically controlling at below 200mA when rated voltage as its main circuit current of voltage transformer, the electric current of 200mA the most also cannot directly be measured by Faraday magnetooptical effect, and its precision cannot ensure.Therefore to improve current measurement precision; sample coil 3 is used when measuring main circuit current; it is to guarantee the winding that its sampling precision typically uses more than 2000 circles that sample coil 3 carries out in fiber optic loop 4 multiple-turns wound; it is directly wound in its relative reliability of fiber optic loop due to sample coil and safety is poor; so must use protective reactance 2 to prevent sample coil 3 from causing an accident when opening a way, to improve the reliability of transformer.
In optical measurement return circuit module, in combining unit 6, it is provided with transmission data module.
So; in electric loop module, principal reactance 1 is responsible for controlling main circuit current and High-Voltage Insulation; protective reactance 2 plays safety effect to prevent the high pressure major loop open circuit when measuring loop and occurring abnormal, and sample coil 3 uses mode that multiturn is wound around with the certainty of measurement of raising optical measurement unit.In optical measurement return circuit module, fiber optic loop 4 is current sensor, harvester 5 comprises the testing circuit unit of optical transformer, modulator loop unit and computing module unit, and combining unit 6 sends by sending data module according to digitized agreement after being responsible for the sample information of multiple electronic mutual inductors has been collected synchronization.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from the technology of the present invention principle; can also make some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (6)
1. an optical electron formula voltage transformer based on Faraday magneto-optical current measurement, is characterized in that, including electric loop module and optical measurement return circuit module；Described electric loop module includes principal reactance and the sample coil being sequentially connected with；Described optical measurement return circuit module includes fiber optic loop, harvester and the combining unit being sequentially connected with；Described sample coil multiple-turns wound is in fiber optic loop.
A kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement the most according to claim 1, is characterized in that, be provided with protective reactance between described principal reactance and sample coil.
A kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement the most according to claim 2, is characterized in that, the number of turn of described sample coil is more than 2000.
A kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement the most according to claim 2, is characterized in that, described harvester includes testing circuit unit, modulator loop unit and computing module unit.
A kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement the most according to claim 2, is characterized in that, be provided with transmission data module in described combining unit.
A kind of optical electron formula voltage transformer based on Faraday magneto-optical current measurement the most according to claim 1, is characterized in that, described fiber optic loop is current sensor.
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| CN104316745B true CN104316745B (en) | 2017-01-11 |
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| CN204214928U (en) * | 2014-11-21 | 2015-03-18 | 贵州电力试验研究院 | A kind of optical electron formula voltage transformer (VT) based on Faraday magneto-optical current measurement |
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Patent Citations (7)
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| US5124634A (en) * | 1989-03-14 | 1992-06-23 | Square D Company | Ring optical current transducer |
| CN101545961A (en) * | 2009-04-21 | 2009-09-30 | 江苏省电力试验研究院有限公司 | System and method for polarity testing of electronic transformer |
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| CN204214928U (en) * | 2014-11-21 | 2015-03-18 | 贵州电力试验研究院 | A kind of optical electron formula voltage transformer (VT) based on Faraday magneto-optical current measurement |
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