CN2339994Y - 220 KV active optic-fiber current transformer - Google Patents
220 KV active optic-fiber current transformer Download PDFInfo
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- CN2339994Y CN2339994Y CN 98235723 CN98235723U CN2339994Y CN 2339994 Y CN2339994 Y CN 2339994Y CN 98235723 CN98235723 CN 98235723 CN 98235723 U CN98235723 U CN 98235723U CN 2339994 Y CN2339994 Y CN 2339994Y
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- current transformer
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- optical fiber
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Abstract
The utility model relates to a 220KV active optic-fiber current transformer, comprising a fiber composite insulator, a high-voltage side part and a low-voltage side part, and composed of a current transformer, a sampling resistor, a pre-amplifier, a voltage to frequency converter, a drive circuit, a light source, a fiber composite insulator, an optic detector, a frequency to voltage converter, an amplifying circuit, a phase shifter, a data collecting processing and displaying device, etc. which are connected sequentially. Digital technique, optoelectronics technique and microprocessor technique are used for carrying out current information collection, transmission detection and data processing. The utility model has the advantages of strong interference immunity, high reliability and insulating performance, light weight, low cost, easy installation, easy dismounting and easy maintenance. At the same time, the utility model is easy to communicate with a supervisory computer.
Description
The utility model relates to the Active Optical Fiber current measurement instrument on a kind of electric system mesohigh circuit.
In electric system, the instrument that requirement is measured the electric current on the high-tension line will have good insulation performance with low-pressure side simultaneously.
Up to now, the conventional current mutual inductor is used widely in electric system.Because this winding of current transformer needs and Secondary Winding High-Voltage Insulation, used the attachment device that does not have direct relation originally with measurement, as ceramic dielectric insulator, injecting oil and gas etc., make that current transformer is bulky, weight increases, consumptive material increases, also have the danger of blast; Simultaneously for above-mentioned reasons, make current transformer that difficulty is installed, institute takes up space very big, not quick detachable and maintenance, and cost is very high.
The purpose of this invention is to provide fine, the Active Optical Fiber current measurement instrument that is suitable for using on the high-tension line of very light in weight simultaneously of a kind of insulating property.
The formation of the said Active Optical Fiber current transformer of the present invention as depicted in figs. 1 and 2.
It comprises optical fiber composite insulator, high-pressure side part and low-pressure side part; The high-pressure side part is: tested current bus bar 1 is provided with a current transformer 2 that is used for gathering current signal on the high-tension line, be provided with in the secondary circuit of current transformer 2 and convert the electric current on the bus to voltage sampling resistor 3 in proportion, sample resistance 3 obtained voltage signals output to prime amplifier 4, and 4 pairs of voltages of prime amplifier amplify to improve signal to noise ratio (S/N ratio); The output terminal of prime amplifier 4 is connected with the input end of voltage to frequency converter 5, voltage to frequency converter 5 with voltage signal by converting frequency signal to the proportional relation of electric current; The output terminal of voltage to frequency converter 5 is connected with driving circuit 6, and driving circuit 6 is for converting frequency signal to the electro-light converting device of light signal; Driving circuit 6 is connected with light source 7, and the light signal that is sent by light source 7 sends to photodetector 10 through fiber optic cables 8 and optical fiber composite insulator 9; Low-pressure side partly is: the output terminal of photodetector 10 is connected with the input end of FV convertor 11, FV convertor 11 converts light signal to electric signal, press conversion through frequently, converted to again with high-tension line on the voltage signal that is in proportion of electric current; Output terminal in FV convertor 11 can be provided with amplifying circuit 12, is connected with at the output terminal of amplifying circuit 12 to be used to eliminate the phase shifter 13 that differs; The output terminal of phase shifter 13 is connected with data acquisition process and display device 14.
The principle of the said Active Optical Fiber current transformer of the utility model is: current transformer 2 becomes the electric current on the high voltage bus into suitable current, convert voltage to through sample resistance 3, after preposition processing and amplifying, deliver to voltage to frequency converter 5, become the frequency signal that is directly proportional with electric current, because the frequency signal anti-interference is very good, is suitable for long-distance transmissions.
The said frequencies signal has promptly formed the light signal that is applicable to Optical Fiber Transmission through light source driving circuit 6 and light source 7.
Light signal arrives the photodetector 10 of low-pressure sides through optical fiber composite insulator 9, has got back to frequency signal, through the voltage to frequency conversion, converted to again with high-tension line on the voltage signal that is in proportion of electric current.To differ in order eliminating, to be provided with phase shifter 13.
Said data acquisition process of the utility model and display device 14 are made up of real effective converter 15, analog to digital converter 16, microcomputer 17 and display 18.
Above-mentioned signal is in order to be suitable for computer sampling, and reduce the time that analog to digital conversion (A/D) takies microcomputer (μ p), in data acquisition process and display device 14, adopt real effective converter 15 and digital to analog converter 16 to link, digital to analog converter 16 links with microcomputer 17, through system controlled by computer A/D sampling, data are handled and pass through display 18 demonstrations.
The feature and advantage of Active Optical Fiber current transformer of the present invention are:
1, in conjunction with new technologies such as photoelectron, microcomputers, advanced technology, reliability are very high, have utilized optical fiber good insulation performance performance and equipotential principle, and low-pressure side and high-pressure side do not have direct electrical communication.
2, adopt extensive and low power consumption integrated circuit, particularly in the selection of voltage to frequency converter (V/FC), adopted synchronous V/FC (SVFC) circuit, sort circuit and general V/F comparison, highly stable, its full scale only is decided by clock.We have adopted crystal oscillator clock, and this oscillator is very stable.Make the device number seldom, very little, the very light in weight of whole high-pressure side partial volume.
3, for the design on the sensing head physical construction, adopted the method for optimizing, can realize shielding, and be easy to heat radiation, filled silicon rubber and sealing in the sensing head simultaneously circuit and current transformer.
Whole instrument is the organic combination of above-mentioned each functional circuit current unit, and they cooperate in harmony, and can realize the safety and precise of high-tension line is measured, and reaches purpose of the present invention and requirement.
Accompanying drawing 1: Active Optical Fiber current transformer circuit schematic diagram;
Accompanying drawing 2: the physical construction synoptic diagram of current transformer.
Preferred example of the present invention is shown in accompanying drawing 1 and accompanying drawing 2, tests through Wuhan Inst. of High Voltage, Ministry of Electric Power according to the technical indicator of the optical fiber current mutual inductor of this figure development, and the result is as follows:
Rated current: 500A
Precision: 0.2%
Weight: 20kg
Be provided with an electric supply installation that is used for above-mentioned active device is provided energy in the accompanying drawing 1, this electric supply installation is that a supply current mutual inductor 19 is set on bus 1, its signal that utilizes secondary circuit provides power supply to prime amplifier 4, voltage to frequency converter 5, driving circuit 6 etc. behind rectification and electric supply installation 20.
Shown in the accompanying drawing 2 is the detection part physical construction of Active Optical Fiber current transformer described in the utility model.Be the high-pressure side part, comprise acquired signal current transformer 2 and supply current mutual inductor 19, be connected compositions such as row 21, sample resistance 3, electronic circuit 22, fiber optic cables 8 and optical fiber junction button 23.Said connection row 21 be " in " font, at the middle part that connects row 21 one chamber 24 is arranged, in chamber 24, be provided with sample resistance 3, electronic circuit 22 (comprising pre-amplification circuit 4, voltage to frequency converter 5, driving circuit 6, light source 7 and electric supply installation 20); Said mutual inductor cover 2 and 19 is enclosed within and is connected on the row 21.Fiber optic cables 8 are connected with electronic circuit 22 by the joints of optical fibre 23.Said fiber optic cables 8 pass the back and are connected with optical fiber composite insulator 9 and photodetector 10 from the current transformer detection part.
The Design of Mechanical Structure of current transformer is to consider from satisfying physical strength, protection against the tide, protection internal electron circuit and sampler, anti-electromagnetic interference (EMI) and being easy to install equal angles.
As shown in Figure 2, electric current (by arrow signal) is shunted after opposite side connects current drainage and goes out then by the mutual inductor center, and the electromagnetic interference (EMI) of electronic circuit place chamber minimizes like this, and transformer casing is the lead alloy manufacturing, both save cost, alleviated weight, do not produced eddy current simultaneously again.
Claims (3)
1, a kind of Active Optical Fiber current transformer is characterized in that, it comprises optical fiber composite insulator, high-pressure side part and low-pressure side part; The high-pressure side part is: tested current bus bar (1) is provided with the current transformer (2) that is used for gathering current signal on the high-tension line, in the secondary circuit of current transformer (2), be provided with sample resistance (3), the voltage signal output end of sample resistance (3) and prime amplifier (4), be connected, the output terminal of prime amplifier (4) is connected with the input end of voltage to frequency converter (5), the output terminal of voltage to frequency converter (5) is connected with driving circuit (6), and driving circuit (6) is connected with light source (7); The light signal that is sent by light source (7) sends to photodetector (10) through fiber optic cables (8) and optical fiber composite insulator (9); Low-pressure side partly is: the output terminal of photodetector (10) is connected with the input end of FV convertor (11), output terminal in FV convertor (11) is provided with amplifying circuit (12), be connected with at the output terminal of amplifying circuit (12) and be used to eliminate the phase shifter (13) that differs, the output terminal of phase shifter (13) is connected with data acquisition process and display device (14); In addition, also be provided with an electric supply installation that is used for active device is provided energy in the part of high-pressure side, this electric supply installation is rectification and the electric supply installation (20) that a supply current mutual inductor (19) is set on bus (1) and utilizes secondary circuit signal.
2, according to the described optical fiber current mutual inductor of claim 1, it is characterized in that, in said data acquisition process and the display device (14), adopt real effective converter (15) and digital to analog converter (16) to link, digital to analog converter (16) links with microcomputer (17), and microcomputer (17) is connected with display (18).
3, according to the described optical fiber current mutual inductor of claim 1, it is characterized in that, the detection part structure of said Active Optical Fiber current transformer, be the high-pressure side part, comprise acquired signal current transformer (2) and supply current mutual inductor (19), be connected row (21), sample resistance (3), electronic circuit (22), fiber optic cables (8) and the joints of optical fibre (23) form.There is a chamber (24) at middle part said connection row (21), be provided with sample resistance (3), electronic circuit (22) in chamber (24), said electronic circuit (22) comprises pre-amplification circuit (4), voltage to frequency converter (5), driving circuit (6), light source (7) and electric supply installation (20); Said sampling mutual inductor cover (2) is enclosed within power supply mutual inductor (19) and is connected on the row (21).Fiber optic cables (8) are connected with electronic circuit (22) by the joints of optical fibre (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98235723 CN2339994Y (en) | 1998-05-09 | 1998-05-09 | 220 KV active optic-fiber current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98235723 CN2339994Y (en) | 1998-05-09 | 1998-05-09 | 220 KV active optic-fiber current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2339994Y true CN2339994Y (en) | 1999-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98235723 Expired - Fee Related CN2339994Y (en) | 1998-05-09 | 1998-05-09 | 220 KV active optic-fiber current transformer |
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| Country | Link |
|---|---|
| CN (1) | CN2339994Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432680C (en) * | 2005-08-24 | 2008-11-12 | 珠海市科荟电器有限公司 | Forcipated mutual-inductor, forcipated ammeter and verification method of forcipated ammeter |
| CN100592441C (en) * | 2008-03-14 | 2010-02-24 | 国网电力科学研究院 | Electron type current transformer for ultrahigh voltage transmission lines and corona loss measurement device thereof |
| CN101309057B (en) * | 2008-06-19 | 2011-04-06 | 西安交通大学 | Ultrasonic energy supply apparatus of photoelectric current inductor |
| CN102539885A (en) * | 2011-12-31 | 2012-07-04 | 中国南方电网有限责任公司超高压输电公司 | Mixed photoelectric impulse current measurement system |
| CN103257266A (en) * | 2013-04-21 | 2013-08-21 | 国家电网公司 | Portable all-insulation optical-fiber current detector |
| CN103675399A (en) * | 2012-09-17 | 2014-03-26 | 上海汽车集团股份有限公司 | Hall current measurement device with strong anti-jamming capability |
| CN104734365A (en) * | 2013-12-20 | 2015-06-24 | 国家电网公司 | Electromagnetic induction type measuring circuit power supply method and device |
| CN111198288A (en) * | 2020-02-17 | 2020-05-26 | 中国人民解放军海军工程大学 | High-voltage signal acquisition system based on optical fiber transmission and acquisition method thereof |
-
1998
- 1998-05-09 CN CN 98235723 patent/CN2339994Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432680C (en) * | 2005-08-24 | 2008-11-12 | 珠海市科荟电器有限公司 | Forcipated mutual-inductor, forcipated ammeter and verification method of forcipated ammeter |
| CN100592441C (en) * | 2008-03-14 | 2010-02-24 | 国网电力科学研究院 | Electron type current transformer for ultrahigh voltage transmission lines and corona loss measurement device thereof |
| CN101309057B (en) * | 2008-06-19 | 2011-04-06 | 西安交通大学 | Ultrasonic energy supply apparatus of photoelectric current inductor |
| CN102539885A (en) * | 2011-12-31 | 2012-07-04 | 中国南方电网有限责任公司超高压输电公司 | Mixed photoelectric impulse current measurement system |
| CN103675399A (en) * | 2012-09-17 | 2014-03-26 | 上海汽车集团股份有限公司 | Hall current measurement device with strong anti-jamming capability |
| CN103257266A (en) * | 2013-04-21 | 2013-08-21 | 国家电网公司 | Portable all-insulation optical-fiber current detector |
| CN104734365A (en) * | 2013-12-20 | 2015-06-24 | 国家电网公司 | Electromagnetic induction type measuring circuit power supply method and device |
| CN111198288A (en) * | 2020-02-17 | 2020-05-26 | 中国人民解放军海军工程大学 | High-voltage signal acquisition system based on optical fiber transmission and acquisition method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |