CN204807626U - Harmonic measuring device based on optics current transformer - Google Patents
Harmonic measuring device based on optics current transformer Download PDFInfo
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- CN204807626U CN204807626U CN201520485356.9U CN201520485356U CN204807626U CN 204807626 U CN204807626 U CN 204807626U CN 201520485356 U CN201520485356 U CN 201520485356U CN 204807626 U CN204807626 U CN 204807626U
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Abstract
The utility model relates to a harmonic measuring device based on optics current transformer, including optics current transformer, the harmonic is measured with merging cells and for relay protection merging cells, optics current transformer's bandwidth for 6KHz-12KHz and this optics current transformer including the sensitive unit of optics current transformer that is used for installing at a generating line and through the optics current transformer acquisition unit of optical cable with the sensitive unit connection of optics current transformer, optics current transformer acquisition unit has harmonic current data output interface and relay protection electric current data output interface simultaneously, the harmonic current data output interface is measured with the harmonic and is linked to each other with merging cells, the relay protection current data output interface links to each other with merging cells for the relay protection. The utility model discloses a harmonic measuring device can satisfy relay protection and harmonic measurement requirement simultaneously, simplifies the installation, and the cost is reduced and measuring error more are favorable to the popularization and application in smart power grids.
Description
Technical field
The utility model relates to harmonic measure technical field, particularly a kind of harmonic measuring device based on optical current mutual inductor.
Background technology
In recent years, along with developing rapidly of modern industry, the application of power electronic devices is increasingly extensive, and the harmonic pollution thereupon brought is also more and more serious, has seriously had influence on the quality of power supply, and brings negative influence to the normal operation of various consumer.Harmonic measure is the main aspect of harmonic problem research, the harmonic content in real time, exactly in detection of grid, and for preventing the harm of harmonic wave from ensureing, electric power netting safe running is very necessary to the definite actual state grasping harmonic wave in electrical network.So-called mains by harmonics in electric, be exactly after the distortion of electrical network sinusoidal current waveform, its waveform can decompose by fourier series, except first-harmonic (50Hz), also have a series of frequency to be just (remaining) string ripple of fundamental frequency integral multiple, these just (remaining) string ripple be referred to as harmonic wave.The electrical network just because of these harmonic injection, just makes power network current wave form distortion.
For the measurement of harmonic current, common electromagnetic current transducer is due to its Bandwidth-Constrained, electromagnetism link matching problem, and its frequency characteristic requires not meet the demands, and can not be used for the measurement of harmonic wave.The current harmonics measurement scheme generally adopted at present adopts the electronic mutual inductor that frequency characteristic is good, bandwidth is high; as hollow coil current transformer, iron-core coil low power current transformer; and the current transformer of harmonic measure is only as the harmonic measure mutual inductor of special purpose, can not use as purposes such as relay protection, metering, row ripples.Existing optical current mutual inductor also only as the current transformer of relay protection, cannot be used for harmonic measure.Existing scheme be the current transformer of harmonic measure only as the harmonic measure mutual inductor (employing electronic mutual inductor) of special purpose, its used for relay protection current transformer maximum with quantity in intelligent substation is all not identical in frequency response, data-interface, data sampling rate etc.If namely in the same position of transformer station, be likely configured with current transformer used for relay protection and the current transformer of harmonic measure simultaneously.
Utility model content
The utility model for existing harmonic measuring device to adopt electronic mutual inductor only as special purpose harmonic measure mutual inductor and can not cause as relay protection purposes the problem needing the current transformer simultaneously configuring current transformer used for relay protection and harmonic measure; a kind of harmonic measuring device based on optical current mutual inductor is provided; relay protection and harmonic measure requirement can be met simultaneously; simplify and install; reduce cost and measuring error, be more conducive to applying in intelligent grid.
The technical solution of the utility model is as follows:
A kind of harmonic measuring device based on optical current mutual inductor, it is characterized in that, comprise optical current mutual inductor, harmonic measure merge cells and merge cells used for relay protection, the bandwidth of described optical current mutual inductor is 6KHz ~ 12KHz and the described optical current mutual inductor optical current mutual inductor collecting unit that comprises the optical current mutual inductor sensing unit for being arranged on a bus and be connected with optical current mutual inductor sensing unit by optical cable, described optical current mutual inductor collecting unit has harmonic current data output interface and relay protection current data output interface simultaneously, described harmonic current data output interface is connected with harmonic measure merge cells, described relay protection current data output interface is connected with merge cells used for relay protection.
Described optical current mutual inductor collecting unit comprises optical current mutual inductor modem module, harmonic measure data processing circuit, relay protection data processing circuit, harmonic current data output interface and relay protection current data output interface, described optical current mutual inductor modem module is connected with optical current mutual inductor sensing unit and the output terminal of optical current mutual inductor modem module exports the sampling rate of 100KHz ~ 1MHz, the output terminal of described optical current mutual inductor modem module connects the input end of harmonic measure data processing circuit and the input end of relay protection data processing circuit respectively, the output terminal of described harmonic measure data processing circuit connects harmonic current data output interface, the output terminal of described relay protection data processing circuit connects relay protection current data output interface.
Described harmonic current data output interface exports the sampling rate of 25.6KHz, and described relay protection current data output interface exports the sampling rate of 4KHz.
Described harmonic current data output interface exports the sampling rate of 12.8KHz, and described relay protection current data output interface exports the sampling rate of 4KHz.
The output terminal of described harmonic measure data processing circuit exports the sampling rate of 25.6KHz, and the output terminal of described relay protection data processing circuit exports the sampling rate of 4KHz.
The output terminal of described harmonic measure data processing circuit exports the sampling rate of 12.8KHz, and the output terminal of described relay protection data processing circuit exports the sampling rate of 4KHz.
Described optical current mutual inductor is all-fiber current transformator, and described optical current mutual inductor sensing unit comprises for the sensing fiber ring through a bus.
Technique effect of the present utility model is as follows:
The harmonic measuring device based on optical current mutual inductor that the utility model provides, comprise optical current mutual inductor, harmonic measure merge cells and merge cells used for relay protection, the optical current mutual inductor collecting unit that this optical current mutual inductor is comprised the optical current mutual inductor sensing unit for being arranged on a bus and is connected with optical current mutual inductor sensing unit by optical cable, optical current mutual inductor collecting unit has harmonic current data output interface and relay protection current data output interface, can simultaneously output harmonic wave current data and relay protection current data, harmonic current measurement and current measurement used for relay protection is completed again by harmonic measure merge cells and merge cells used for relay protection, the optical current mutual inductor of specific bandwidth and specific output interface is set, especially this high-speed data output interface of harmonic current data output interface has been set up to export the current data being exclusively used in harmonic measure, with harmonic measure merge cells and merge cells cooperating used for relay protection, complete the measurement of harmonic current measurement and electric current used for relay protection simultaneously, avoid existing optical current mutual inductor also only cannot be used for harmonic measure problem as relay protection purposes, it also avoid existing harmonic measuring device adopt electronic mutual inductor only as special purpose harmonic measure mutual inductor and can not cause needing the problem of the current transformer simultaneously configuring current transformer used for relay protection and harmonic measure as relay protection purposes, harmonic measuring device of the present utility model is based on the optical current mutual inductor of specific bandwidth and output interface, utilize the advantage that frequency response characteristic is good and bandwidth is high that optical current mutual inductor self is intrinsic, relay protection and harmonic measure requirement can be met simultaneously, a mutual inductor equipment can complete two kinds of purposes---simultaneously as the harmonious wave measurement Current Transformer of relay protection Current Transformer, without the need to arranging multiple mutual inductor at the same position of transformer station, reduce cost, simplify installation, this harmonic measuring device structure is simple, easy to use, and measuring error can be reduced to a great extent, more be conducive to applying in intelligent grid.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model based on the harmonic measuring device of optical current mutual inductor.
Fig. 2 is the preferred structure figure of the optical current mutual inductor collecting unit in Fig. 1.
In figure, each label lists as follows:
1-bus; 2-optical current mutual inductor sensing unit; 3-optical current mutual inductor collecting unit; 4-harmonic current data output interface; 5-relay protection current data output interface.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described.
The utility model relates to a kind of harmonic measuring device based on optical current mutual inductor, its structure as shown in Figure 1, comprise optical current mutual inductor, harmonic measure merge cells and merge cells used for relay protection, the bandwidth of optical current mutual inductor is arranged on 6KHz ~ 12KHz and this optical current mutual inductor comprises by the interconnective optical current mutual inductor sensing unit 2 of optical cable and optical current mutual inductor collecting unit 3, optical current mutual inductor sensing unit 2 is for being arranged on bus 1 place, optical current mutual inductor collecting unit 3 has harmonic current data output interface 4 and relay protection current data output interface 5 simultaneously, harmonic current data output interface 4 is connected with harmonic measure merge cells, relay protection current data output interface 5 is connected with merge cells used for relay protection.
Optical current mutual inductor can be the optical current mutual inductor of all-fiber current transformator or other type, the optical current mutual inductor of embodiment adopts all-fiber current transformator as shown in Figure 1, its optical current mutual inductor sensing unit 2 comprises plectrum, sensing fiber ring and catoptron, a bus 1 passes the inside of sensing fiber ring, optical current mutual inductor collecting unit 3 comprises light source, optical splitter, phase-modulator, photodetector, A/D change-over circuit, digital signal processing circuit, the assemblies such as harmonic current data output interface and relay protection current data output interface, optical current mutual inductor sensing unit 3 produces phase differential by Faraday magnetooptical effect effect, the collection of optical current mutual inductor collecting unit carry phase information light and complete after modulation /demodulation and data processing high-fidelity current data gather after respectively through harmonic current data output interface 4 and relay protection current data output interface 5 output harmonic wave current data and relay protection current data simultaneously, complete after the format conversion of different digital frame and multichannel merge into the process of a road signal respectively by harmonic measure merge cells and merge cells used for relay protection again and export, complete harmonic measure and current measurement used for relay protection simultaneously.Harmonic measure merge cells and merge cells used for relay protection are hardware device that can be conventional in this area directly bought on the market.
The structure of the optical current mutual inductor in harmonic measuring device of the present utility model and internal data handling principle not identical with existing common relay protection Current Transformer.The preferred structure of the optical current mutual inductor collecting unit 3 in Fig. 1 as shown in Figure 2, this optical current mutual inductor collecting unit 3 comprises optical current mutual inductor modem module, harmonic measure data processing circuit, relay protection data processing circuit, harmonic current data output interface 4 and relay protection current data output interface 5, optical current mutual inductor modem module is connected with optical current mutual inductor sensing unit and the output terminal of optical current mutual inductor modem module exports the sampling rate of 100KHz ~ 1MHz, the output terminal of optical current mutual inductor modem module connects the input end of harmonic measure data processing circuit and the input end of relay protection data processing circuit respectively, the output terminal of harmonic measure data processing circuit connects harmonic current data output interface 4, the output terminal of relay protection data processing circuit connects relay protection current data output interface 5.Wherein, optical current mutual inductor modem module comprises light source, optical splitter, phase-modulator, photodetector, the assemblies such as A/D change-over circuit, modulation /demodulation process is carried out after what optical current mutual inductor modem module received that optical current mutual inductor collecting unit 2 sends carry the light of phase information, by being arranged to the modulating frequency of phase-modulator the output terminal of optical current mutual inductor modem module exports the sampling rate of 100KHz ~ 1MHz, and be delivered to after harmonic measure data processing circuit and relay protection data processing circuit carry out harmonic measure data processing and data processing used for relay protection respectively simultaneously, export special merge cells respectively to again.Particularly, harmonic measure data processing circuit carries out the sampling rate that the process such as low-pass filtering or statistical average exports 25.6KHz, harmonic current data output interface is sent to the form of packet, data identification is carried out by harmonic current data output interface, the sampling rate identifying and export after data check process 25.6KHz is harmonic current data, be sent to harmonic measure merge cells again, harmonic measure merge cells is after the data receiving 25.6KHz sampling rate, complete the process that the format conversion of different digital frame and multichannel merge into a road signal, according to certain agreement, harmonic current data is sent to host computer, equally, relay protection data processing circuit also carries out the sampling rate that the process such as low-pass filtering or statistical average exports 4KHz, relay protection current data output interface is sent to the form of packet, data identification is carried out by relay protection current data output interface, the sampling rate identifying and export after data check process 4KHz is relay protection current data, be sent to merge cells used for relay protection again, merge cells used for relay protection is after the data receiving 4KHz sampling rate, complete the process that the format conversion of different digital frame and multichannel merge into a road signal, according to certain agreement, relay protection current data is sent to host computer.
Being distinguished as of harmonic measure Current Transformer and common relay protection Current Transformer: higher bandwidth, the bandwidth >=6kHz of the optical current mutual inductor that the utility model adopts, its bandwidth is preferably about 10KHz; Data more at a high speed export; generally to reach the sampling rate of 12.8KHz; the sampling rate of the 25.6KHz shown in preferred employing Fig. 2; the utility model is outside the 4KHz sampling rate of traditional optical current mutual inductor used for relay protection exports, the high-speed data output interface of the sampling rate of many 25.6KHz.The high-speed data output interface newly increased is the data output interface being exclusively used in harmonic measure---harmonic current data output interface 4.Based on the harmonic measuring device of optical current mutual inductor; relay protection current data output interface 5 exports the sampling rate of 4KHz; harmonic current data output interface exports the sampling rate (output terminal of harmonic measure data processing circuit also exports the sampling rate of 25.6KHz) of 25.6KHz; the harmonic measure data that the utility model has the sampling rate relay protection data output of 4KHz and the sampling rate of 25.6KHz simultaneously export, and meet the requirement of relay protection and harmonic measure simultaneously.Certainly; harmonic current data output interface also can export the sampling rate (output terminal of harmonic measure data processing circuit also exports the sampling rate of 12.8KHz) of 12.8KHz; now the utility model has the harmonic measure data output of the sampling rate relay protection data output of 4KHz and the sampling rate of 12.8KHz simultaneously, has relay protection current measurement function and harmonic wave current measurement function simultaneously.
The technical solution of the utility model utilizes the natural optical current mutual inductor with high-frequency responding range, high bandwidth characteristic, makes it meet relay protection and harmonic measure to the demand of current transformer simultaneously.Namely use an optical current mutual inductor, carry out measurement and the harmonic current measurement of electric current used for relay protection simultaneously, simplify and install, reduce cost and measuring error, be more conducive to applying in intelligent grid.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this instructions has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can modify to the invention or equivalent replacement; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (7)
1. the harmonic measuring device based on optical current mutual inductor, it is characterized in that, comprise optical current mutual inductor, harmonic measure merge cells and merge cells used for relay protection, the bandwidth of described optical current mutual inductor is 6KHz ~ 12KHz and the described optical current mutual inductor optical current mutual inductor collecting unit that comprises the optical current mutual inductor sensing unit for being arranged on a bus and be connected with optical current mutual inductor sensing unit by optical cable, described optical current mutual inductor collecting unit has harmonic current data output interface and relay protection current data output interface simultaneously, described harmonic current data output interface is connected with harmonic measure merge cells, described relay protection current data output interface is connected with merge cells used for relay protection.
2. the harmonic measuring device based on optical current mutual inductor according to claim 1, it is characterized in that, described optical current mutual inductor collecting unit comprises optical current mutual inductor modem module, harmonic measure data processing circuit, relay protection data processing circuit, harmonic current data output interface and relay protection current data output interface, described optical current mutual inductor modem module is connected with optical current mutual inductor sensing unit and the output terminal of optical current mutual inductor modem module exports the sampling rate of 100KHz ~ 1MHz, the output terminal of described optical current mutual inductor modem module connects the input end of harmonic measure data processing circuit and the input end of relay protection data processing circuit respectively, the output terminal of described harmonic measure data processing circuit connects harmonic current data output interface, the output terminal of described relay protection data processing circuit connects relay protection current data output interface.
3. the harmonic measuring device based on optical current mutual inductor according to claim 1; it is characterized in that; described harmonic current data output interface exports the sampling rate of 25.6KHz, and described relay protection current data output interface exports the sampling rate of 4KHz.
4. the harmonic measuring device based on optical current mutual inductor according to claim 1; it is characterized in that; described harmonic current data output interface exports the sampling rate of 12.8KHz, and described relay protection current data output interface exports the sampling rate of 4KHz.
5. the harmonic measuring device based on optical current mutual inductor according to claim 2; it is characterized in that; the output terminal of described harmonic measure data processing circuit exports the sampling rate of 25.6KHz, and the output terminal of described relay protection data processing circuit exports the sampling rate of 4KHz.
6. the harmonic measuring device based on optical current mutual inductor according to claim 2; it is characterized in that; the output terminal of described harmonic measure data processing circuit exports the sampling rate of 12.8KHz, and the output terminal of described relay protection data processing circuit exports the sampling rate of 4KHz.
7. according to the harmonic measuring device based on optical current mutual inductor one of claim 1 to 6 Suo Shu, it is characterized in that, described optical current mutual inductor is all-fiber current transformator, and described optical current mutual inductor sensing unit comprises for the sensing fiber ring through a bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520485356.9U CN204807626U (en) | 2015-07-07 | 2015-07-07 | Harmonic measuring device based on optics current transformer |
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| CN201520485356.9U CN204807626U (en) | 2015-07-07 | 2015-07-07 | Harmonic measuring device based on optics current transformer |
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| CN204807626U true CN204807626U (en) | 2015-11-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727910A (en) * | 2017-09-29 | 2018-02-23 | 国网吉林省电力有限公司电力科学研究院 | A kind of transformer station's current synchronization harvester based on active electronic type instrument transformer |
| CN108445289A (en) * | 2018-03-09 | 2018-08-24 | 北京四方继保自动化股份有限公司 | A kind of high voltage direct current optical harmonic measuring device |
-
2015
- 2015-07-07 CN CN201520485356.9U patent/CN204807626U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727910A (en) * | 2017-09-29 | 2018-02-23 | 国网吉林省电力有限公司电力科学研究院 | A kind of transformer station's current synchronization harvester based on active electronic type instrument transformer |
| CN107727910B (en) * | 2017-09-29 | 2020-12-18 | 国网吉林省电力有限公司电力科学研究院 | Synchronous collection system of transformer substation's electric current based on passive electronic transformer |
| CN108445289A (en) * | 2018-03-09 | 2018-08-24 | 北京四方继保自动化股份有限公司 | A kind of high voltage direct current optical harmonic measuring device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210331 Address after: No.17 Binhe Road, Nanming District, Guiyang City, Guizhou Province Patentee after: GUIZHOU POWER GRID Corp. Address before: 550002 No. 32, Jiefang Road, Guizhou, Guiyang Patentee before: GUIZHOU ELECTRIC POWER EXPERIMENTAL Research Institute Patentee before: ENERXY QIANYUAN (BEIJING) ELECTRIC POWER TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |