CN102375106A - Device for testing harmonic influence of electronic mutual inductor - Google Patents
Device for testing harmonic influence of electronic mutual inductor Download PDFInfo
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- CN102375106A CN102375106A CN2011102369445A CN201110236944A CN102375106A CN 102375106 A CN102375106 A CN 102375106A CN 2011102369445 A CN2011102369445 A CN 2011102369445A CN 201110236944 A CN201110236944 A CN 201110236944A CN 102375106 A CN102375106 A CN 102375106A
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Abstract
The invention relates to a device for testing the harmonic influence of an electronic mutual inductor. The device comprises a large-power fundamental wave and harmonic wave synthesizing unit, a harmonic wave standard current-voltage mutual inductor, a standard current-voltage converting device and an electronic mutual inductor harmonic calibrating instrument, wherein the large-power fundamental wave and harmonic wave synthesizing unit consists of a fundamental wave power supply unit, a harmonic wave power unit and a fundamental wave and harmonic wave synthesis output unit; the harmonic wave standard current-voltage mutual inductor is connected with the primary of a tested electronic current-voltage mutual inductor and the output end of the fundamental wave and harmonic wave synthesis output unit; an output signal of the harmonic wave standard current-voltage mutual inductor is connected to the standard current-voltage converting device; an output signal of the standard current-voltage converting device is connected to the electronic mutual inductor harmonic wave calibrating instrument; and the signal output end of the tested electronic current-voltage mutual inductor is connected with the electronic mutual inductor harmonic wave calibrating instrument. The invention provides an effective method for harmonic calibration of the electronic mutual inductor.
Description
Technical field
The present invention relates to a kind of electronic mutual inductor harmonic effects proving installation, belong to power equipment calibrating and detection technique field.
Background technology
The at present domestic method that the research of electronic mutual inductor harmonic characteristic is adopted is the frequency characteristic method; Promptly feed electric current (voltage) signal of different frequency respectively at the primary side of electronic mutual inductor; Measure its corresponding error, obtain the frequency characteristic of electronic mutual inductor.But the practical operation situation of this test method and electronic mutual inductor is variant.During practical operation situation, the signal that is added in the electronic mutual inductor primary side is the synthetic signal of multiple harmonic, rather than the signal of independent some frequencies.
Development electronic mutual inductor harmonic characteristic calibrating installation purpose is to study harmonic wave metering and the protection feature of electronic mutual inductor under actual condition, guarantees the electric system reliability service, accelerates to advance the unified strong intelligent grid construction of China.
Summary of the invention
The purpose of this invention is to provide a kind of electronic mutual inductor harmonic effects proving installation; As a calibration measurement system, it has set up high-power electric current voltage harmonic source, with the synthetic back output of fundamental signal harmonic signal; Actual operating mode that can analog electrical minor mutual inductor; Through the harmonic error check system, the harmonic characteristic of electronic mutual inductor actual motion is launched research then, fill up the blank in this field.
Technical scheme of the present invention is:
Said a kind of electronic mutual inductor harmonic effects proving installation comprises: high-power principal wave harmonic wave synthesizes power supply 1, harmonic standard current-voltage transformer 5, normalized current voltage conversion device 7, electronic mutual inductor harmonic wave tester 8;
The synthetic power supply 1 of high-power principal wave harmonic wave comprises first-harmonic power supply unit 2, harmonic wave power supply unit 3, the synthetic output unit 4 of principal wave harmonic wave;
When tested electronic current voltage transformer (VT) 6 is calibrated; The output signal of the first-harmonic power supply unit 2 harmonic power supply units 3 of the synthetic power supply of high-power principal wave harmonic wave 1 inside passes through current lifting device after the synthetic output unit 4 of principal wave harmonic wave synthesizes; Stepup transformer obtains big electric current, high voltage output;
The output terminal of the synthetic output unit 4 of the elementary and principal wave harmonic wave of harmonic standard current-voltage transformer 5 and tested electronic current voltage transformer (VT) 6 is connected: for current transformer is to be connected in series, like Fig. 1 (a); For voltage transformer (VT) is to be connected in parallel, like Fig. 1 (b); The output signal of harmonic standard current-voltage transformer 5 is connected to the signal input part of normalized current voltage conversion device 7; The output of normalized current voltage conversion device 7 is connected to a signal input part of electronic mutual inductor harmonic wave tester 8; The output of tested electronic current voltage transformer (VT) 6 is connected to another signal input part of electronic mutual inductor harmonic wave tester 8.
The synthetic power supply 1 of high-power principal wave harmonic wave confirms that through the selection of stack switch the output of the synthetic power supply 1 of high-power principal wave harmonic wave is first-harmonic or harmonic wave, or the first-harmonic harmonic is synthetic; The amplitude of first-harmonic and each harmonic is regulated by the output voltage adjusting module.
Connecting resistance mode behind the harmonic standard current transformer employing high precision double electrode current mutual inductor in the harmonic standard current-voltage transformer 5, the harmonic standard voltage transformer (VT) adopts bipolar voltage mutual inductor concatenation technology.
Adopt direct comparison principle, the harmonic standard current-voltage transformer 5 and the output data of tested electronic current voltage transformer (VT) 6 are carried out directly comparing after the signal Processing; Ratio error draws through the effective value of fundametal compoment in comparing harmonics present normalized current voltage transformer (VT) 5 and tested electronic current voltage transformer (VT) 6 frequency domains.Phase differential carries out spectrum analysis or the acquisition of interactive power spectrumanalysis through calculating FFT.
The present invention provides a kind of effective method for the harmonic characteristic calibration of electronic mutual inductor, and its advantage is:
1) sets up high-power electric current voltage harmonic experiment porch.Can big electric current of the first harmonic of analog electrical minor mutual inductor under actual working conditions or high voltage;
2) develop electronic mutual inductor harmonic characteristic calibration test system, comprised harmonic standard mutual inductor and electronic mutual inductor harmonic wave check system.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is the high-power electric current voltage harmonic of a present invention source principle.
Fig. 3 is harmonic current standard converter resistance CC figure of the present invention.
Fig. 4 is an electronic mutual inductor harmonic wave verification structured flowchart of the present invention.
Fig. 5 is an electronic mutual inductor harmonic wave checking routine process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment electronic mutual inductor harmonic effects proving installation of the present invention is done further explanation.
Mark among Fig. 1: 1-high-power principal wave harmonic wave synthesizes power supply, 2-first-harmonic power supply unit, 3-harmonic wave power supply unit, the synthetic output unit of 4-principal wave harmonic wave, 5-harmonic standard electric current (voltage) mutual inductor, 6-tested electronic current (voltage) mutual inductor, 7-normalized current (voltage) conversion equipment, 8-electronic mutual inductor harmonic wave tester.
As shown in Figure 1, the embodiment of the invention comprises that high-power principal wave harmonic wave synthesizes power supply 1, harmonic standard electric current (voltage) mutual inductor 5, tested electronic current (voltage) mutual inductor 6, normalized current (voltage) conversion equipment 7, electronic mutual inductor harmonic wave tester 8.The synthetic power supply 1 of high-power principal wave harmonic wave comprises the synthetic output unit 4 of first-harmonic power supply unit 2, harmonic wave power supply unit 3 and principal wave harmonic wave.
Synthetic power principle figure is as shown in Figure 2 for high-power electric current voltage harmonic, and at first crystal oscillating circuit one tunnel produces the 50HZ signal, through producing the 50Hz sinusoidal signal after the D/A module, outputs to the power amplification link.Another road produces the each harmonic signal through frequency splitting technology, through after the phase settings, outputs to the D/A module and produces the each harmonic sinusoidal signal; Harmonic wave stack switch is selected whether the harmonic wave stack is got into first-harmonic and is carried out power amplification, and the amplitude of first-harmonic and each harmonic can be regulated through the output voltage adjusting module simultaneously; The principal wave harmonic wave composite signal of power amplification link output is through output after filtering and the isolating transformer.The current/voltage testing circuit detects output current voltage, simultaneously detection signal is returned to the power amplification link, reaches the purpose of current/voltage closed-loop control; The resultant voltage signal of isolating transformer output produces big electric current (high voltage) through current lifting device (stepup transformer).
Harmonic standard mutual inductor and electronic mutual inductor harmonic wave check system.Wherein the harmonic standard current transformer has adopted connecting resistance mode behind the high precision twin-stage current transformer, and the resistance CC is as shown in Figure 3.The harmonic standard voltage transformer (VT) adopts twin-stage voltage transformer (VT) concatenation technology, and experiment proof overall precision can reach 0.01%.
Electronic mutual inductor harmonic wave tester structure is as shown in Figure 4; Standard channel data acquisition unit and tested channel data collecting unit have adopted the NI5922 high-accuracy data collection card; NI 922 is binary channels variable-resolution digitizers, has the highest in the market resolution and HDR.NI PCI-5922 can improve resolution through reducing sampling rate in the velocity range of 24 500 kS/s to 16 15 MS/s.Dirigibility that this is superpower and resolution come from NI Flex II ADC technology, and this technology has been used multidigit delta-sigma to strengthen converter and obtained the linearization technique of patent.PCI-5922 is used in combination with softwares such as NI LabVIEW, and its measurement performance can surmount the high end instrument of intimate with it tradition.
The digital data acquisition passage is the Ethernet card of optical fiber or RJ45 interface; The outside is furnished with high-speed light Ethernet interpreter simultaneously; Be output as optical fiber output like combiner, then will get final product for the RJ45 interface through its conversion of signals of optical Ethernet interpreter, the convenient tester that inserts uses.
In order to satisfy high-precise synchronization needs regularly, all right external GPS synchronizing signal of synchronizing pulse is followed the tracks of the GPS pulse per second (PPS), and synchronization accuracy is the submicrosecond level.In order to satisfy different synchronization triggering demand, be provided with the light input synchronously simultaneously, the electricity input is synchronous, electricity output, and have negative function.The frequency of synchronizing pulse also can be provided with as required.
Data processing and error display unit have adopted the Labview graphical programming software, and this software is the innovative product of American National instrument company-and based on the development environment of G language, cooperate numerous collecting test integrated circuit board of NI company to be referred to as " virtual instrument ".So-called virtual instrument; Be exactly on universal computer platform; The user its essence is traditional instrument hardware and latest computed machine software engineering are fully combined according to requirement definition of oneself and the test function that designs an apparatus, to realize and to expand the function of traditional instrument.Compare with traditional instrument, virtual instrument all has tangible technical advantage at aspects such as intelligent degree, processing power, the ratio of performance to price, operability.The developer can be according to customer requirement customized software interface, function.
Electronic mutual inductor harmonic wave checking routine process flow diagram is as shown in Figure 5, adopts direct comparison expression principle, and the digital output data that is about to standard mutual inductor and tested mutual inductor carries out directly comparing after the signal Processing.Ratio error draws through the effective value of fundametal compoment in standard of comparison mutual inductor and the tested mutual inductor frequency domain, and phase differential carries out spectrum analysis or cross-power spectrum analysis acquisition through calculating FFT.
During practical implementation, the synthetic power supply 1 output first-harmonic harmonic resultant voltage signal of high-power principal wave harmonic wave, the parameter of first-harmonic harmonic is controlled respectively by first-harmonic power supply unit 2 harmonic power supply units 3; The synthetic power supply output of high-power principal wave harmonic wave signal forms big electric current (high voltage) test loop; In simultaneously big electric current (high voltage) test loop of harmonic standard electric current (voltage) mutual inductor 5 and tested electronic current (voltage) mutual inductor; The signal of harmonic standard electric current (voltage) mutual inductor 5 outputs inserts in the electronic mutual inductor harmonic wave tester 8 through normalized current (voltage) conversion equipment 7 backs; Tested electronic current (voltage) mutual inductor output signal directly inserts electronic mutual inductor harmonic wave tester 8; Electronic mutual inductor harmonic wave tester 8 carries out corresponding data acquisition and calculating with this two paths of signals, can draw the harmonic error characteristic of electronic mutual inductor.
The synthetic power supply 1 of high-power principal wave harmonic wave wherein can be regulated the number of times of amplitude, phase place and the harmonic wave of first-harmonic harmonic as required.First-harmonic and each harmonic can independent regulation, can comprise multiple harmonic wave simultaneously, and overtone order reaches as high as 11 times.Harmonic current and voltage under can analog electrical minor mutual inductor actual operating mode be calibrated thereby it is carried out frequency characteristic.
Claims (4)
1. electronic mutual inductor harmonic effects proving installation, it is characterized in that: said electronic mutual inductor harmonic effects proving installation comprises: high-power principal wave harmonic wave synthesizes power supply (1), harmonic standard current-voltage transformer (5), normalized current voltage conversion device (7), electronic mutual inductor harmonic wave tester (8);
High-power principal wave harmonic wave synthesizes power supply (1) and comprises first-harmonic power supply unit (2), harmonic wave power supply unit (3), the synthetic output unit (4) of principal wave harmonic wave;
To tested electronic current voltage transformer (VT) (6) when calibrating; The output signal that high-power principal wave harmonic wave synthesizes inner first-harmonic power supply unit (2) the harmonic power supply unit (3) of power supply (1) passes through current lifting device after the synthetic output unit (4) of principal wave harmonic wave is synthetic; Stepup transformer obtains big electric current, high voltage output;
The output terminal of the synthetic output unit (4) of the elementary and principal wave harmonic wave of harmonic standard current-voltage transformer (5) and tested electronic current voltage transformer (VT) (6) is connected: for current transformer is to be connected in series, and is to be connected in parallel for voltage transformer (VT); The output signal of harmonic standard current-voltage transformer (5) is connected to the signal input part of normalized current voltage conversion device (7); The output of normalized current voltage conversion device (7) is connected to a signal input part of electronic mutual inductor harmonic wave tester (8); The output of tested electronic current voltage transformer (VT) (6) is connected to another signal input part of electronic mutual inductor harmonic wave tester (8).
2. a kind of electronic mutual inductor harmonic effects proving installation according to claim 1; It is characterized in that: high-power principal wave harmonic wave synthesizes power supply (1) and confirms that through the selection of stack switch the output that high-power principal wave harmonic wave synthesizes power supply (1) is first-harmonic or harmonic wave, or the synthesizing of first-harmonic harmonic; The amplitude of first-harmonic and each harmonic is regulated by the output voltage adjusting module.
3. a kind of electronic mutual inductor harmonic effects proving installation according to claim 1; It is characterized in that: connecting resistance mode behind the harmonic standard current transformer employing high precision double electrode current mutual inductor in the harmonic standard current-voltage transformer (5), the harmonic standard voltage transformer (VT) adopts bipolar voltage mutual inductor concatenation technology.
4. a kind of electronic mutual inductor harmonic effects proving installation according to claim 1; It is characterized in that: adopt direct comparison principle, the harmonic standard current-voltage transformer (5) and the output data of tested electronic current voltage transformer (VT) (6) are carried out directly comparing after the signal Processing; Ratio error draws through the effective value of fundametal compoment in comparing harmonics present normalized current voltage transformer (VT) (5) and tested electronic current voltage transformer (VT) (6) frequency domain; Phase differential carries out spectrum analysis or the acquisition of interactive power spectrumanalysis through calculating FFT.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103472431A (en) * | 2013-09-11 | 2013-12-25 | 国家电网公司 | Etalon of electronic current mutual inductor and verifying structures of electronic current mutual inductor |
| CN103941177A (en) * | 2014-03-25 | 2014-07-23 | 同济大学 | Method for testing digital circuits of Sigma-delta ADC and Sigma-delta DAC with same accuracy in chip |
| CN104316796A (en) * | 2014-10-24 | 2015-01-28 | 国家电网公司 | High power harmonic power supply characteristic testing system and method |
| CN104345234A (en) * | 2014-10-24 | 2015-02-11 | 国网四川省电力公司电力科学研究院 | Harmonic power supply feature test system and method |
| CN102841330B (en) * | 2012-08-02 | 2016-05-25 | 中国电力科学研究院 | A kind of calibration steps for calibration analyte instrument |
| CN106054102A (en) * | 2016-08-11 | 2016-10-26 | 国网浙江省电力公司电力科学研究院 | Current-transformer harmonic wave error measurement system |
| CN106324407A (en) * | 2016-09-28 | 2017-01-11 | 国家电网公司 | Voltage transformer's second harmonic elimination device detector |
| CN106772199A (en) * | 2017-01-05 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of DC current transformer frequency response characteristic check system and method |
| CN106872927A (en) * | 2017-02-16 | 2017-06-20 | 中国电力科学研究院 | The assay method and error analysis method of the harmonic wave degree of accuracy of electronic type voltage transformer |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841330B (en) * | 2012-08-02 | 2016-05-25 | 中国电力科学研究院 | A kind of calibration steps for calibration analyte instrument |
| CN103472431A (en) * | 2013-09-11 | 2013-12-25 | 国家电网公司 | Etalon of electronic current mutual inductor and verifying structures of electronic current mutual inductor |
| CN103472431B (en) * | 2013-09-11 | 2015-11-25 | 国家电网公司 | Electronic current mutual inductor standard and electronic current mutual inductor verification structure |
| CN103941177A (en) * | 2014-03-25 | 2014-07-23 | 同济大学 | Method for testing digital circuits of Sigma-delta ADC and Sigma-delta DAC with same accuracy in chip |
| CN103941177B (en) * | 2014-03-25 | 2016-06-15 | 同济大学 | With the digital circuit test method of precision Sigma-delta ADC and Sigma-delta DAC in chip |
| CN104345234A (en) * | 2014-10-24 | 2015-02-11 | 国网四川省电力公司电力科学研究院 | Harmonic power supply feature test system and method |
| CN104316796A (en) * | 2014-10-24 | 2015-01-28 | 国家电网公司 | High power harmonic power supply characteristic testing system and method |
| CN104345234B (en) * | 2014-10-24 | 2017-04-26 | 国网四川省电力公司电力科学研究院 | Harmonic power supply feature test system and method |
| CN104316796B (en) * | 2014-10-24 | 2017-06-13 | 国家电网公司 | A kind of high-power Harmonic Current characteristic test system and method |
| CN106054102A (en) * | 2016-08-11 | 2016-10-26 | 国网浙江省电力公司电力科学研究院 | Current-transformer harmonic wave error measurement system |
| CN106054102B (en) * | 2016-08-11 | 2019-10-11 | 国网浙江省电力公司电力科学研究院 | A kind of current transformer harmonic error measuring system |
| CN106324407A (en) * | 2016-09-28 | 2017-01-11 | 国家电网公司 | Voltage transformer's second harmonic elimination device detector |
| CN106324407B (en) * | 2016-09-28 | 2023-07-25 | 国家电网公司 | Detector for secondary resonance elimination device of voltage transformer |
| CN106772199A (en) * | 2017-01-05 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of DC current transformer frequency response characteristic check system and method |
| CN106872927A (en) * | 2017-02-16 | 2017-06-20 | 中国电力科学研究院 | The assay method and error analysis method of the harmonic wave degree of accuracy of electronic type voltage transformer |
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Application publication date: 20120314 |