CN102269787A - Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof - Google Patents
Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof Download PDFInfo
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Abstract
The invention provides a detection method of the harmonic characteristic of an electronic voltage transformer and a detection device thereof, and the detection device comprises a voltage regulator T1, a single-phase step-up transformer T2, a capacitive voltage divider, the voltage transformer to be detected, a single-phase step-down transformer T3, a measuring device and a single-phase full-controlled rectifier bridge load, wherein the input side of the voltage regulator T1 is connected with a power frequency testing power supply, the single-phase step-up transformer T2 is connected with the output side of the T1 and used for stepping up the voltage of the power supply to the testing voltage, the capacitive voltage divider, the voltage transformer to be detected and the single-phase step-down transformer T3 are connected with the output side of the T2 in parallel, the measuring device is connected with the capacitive voltage divider and the voltage transformer to be detected, and the single-phase full-controlled rectifier bridge load is connected with the output side of the T3. By adopting the detection method of the harmonic characteristic of the electronic voltage transformer provided by the invention, the harmonic source part can generate a primary voltage capable of simulating the superposition of a rated voltage of a harmonic voltage of a real power grid and all orders of the harmonic voltages, the detection device can detect the frequency characteristic of the electronic voltage transformer to all the orders of the harmonic voltages and then accurate measurement of the harmonic voltages in a power system can be further realized.
Description
Technical field
The present invention relates to a kind of harmonic characteristic detection method and pick-up unit thereof of electronic type voltage transformer, belong to the power measurement technical field, relate in particular to a kind of accurately detected electrons formula voltage transformer (VT) harmonic characteristic, final detection method and the pick-up unit thereof that harmonic voltage is accurately measured realized.
Background technology
Current, along with being on the increase of nonlinear load, the harmonic problem in the electric system is serious day by day, and electric energy metrical has been produced very remarkable influence, has caused such as quantitative model, metering algorithm, has increased the great number of issues such as error in dipping that have measuring apparatus now.Except that the non-vanishing factor of harmonic wave active power, the main reason that causes these problems is that the harmonic response characteristic of measuring apparatus exists difference.In addition, harmonic wave also can influence relay protection, and causing with the power frequency amount is the measuring error of the protection algorithm of parameter, and influence is protected algorithm accuracy, caused protecting malfunction or tripping.Electric power mutual-inductor is as the core parts of electric energy metrical, and its harmonic response characteristic is the key factor that harmonic wave is accurately measured.Therefore, the harmonic characteristic to electric power mutual-inductor detects, grasps its harmonic response performance and has important significance for theories and practice significance.
It is few at present the mutual inductor harmonic characteristic to be detected the domestic standard that proposes regulation, " GB/T20840.8-2007 mutual inductor the 8th part: electronic current mutual inductor " proposed the harmonic response and the harmonic wave accuracy requirement of electronic current and voltage transformer (VT), regulation " considers that from reality it is acceptable that the test of each harmonic accuracy of measurement only applies the single harmonic frequency at primary side ".But point out simultaneously for this standard of electronic current mutual inductor: ideally to the test of harmonic wave, desired each harmonic frequency component should superpose on rated frequency and rated primary current.This is because rated primary current stack each harmonic component is the objectively responding of true harmonic wave in the electrical network, also is like this for harmonic voltage.
In view of this, be necessary to provide a kind of accurately detected electrons formula voltage transformer (VT) harmonic characteristic, final detection method and the pick-up unit thereof that harmonic voltage is accurately measured realized, to satisfy the commercial Application needs.
Summary of the invention
Technical matters to be solved by this invention is: detect the problem that lacks effective detection method and pick-up unit in order to solve existing harmonic characteristic to electronic type voltage transformer, the invention provides a kind of harmonic characteristic detection method of electronic type voltage transformer, its harmonic source part can produce rated voltage and the superimposed primary voltage of each harmonic voltage that can simulate true mains by harmonics voltage, its pick-up unit can be measured the frequency characteristic of electronic type voltage transformer to each harmonic voltage, realizes the accurate measurement to harmonic voltage in electric system.
The technical solution adopted in the present invention is: a kind of harmonic characteristic pick-up unit of electronic type voltage transformer, form by pressure regulator, single-phase step-up transformer, capacitive divider, voltage transformer (VT) to be detected, measurement mechanism, single phase step-down transformer and single-phase full-controlled rectifier load per axle, it is characterized in that:
Described pressure regulator input side joint industrial frequency experiment power supply, its outgoing side provides adjustable input voltage for single-phase step-up transformer; Described single-phase step-up transformer input side joint pressure regulator outgoing side boosts to trial voltage with supply voltage; Described capacitive divider is connected to the single-phase step-up transformer outgoing side, for measurement mechanism provides the signal of tracing to the source for measuring the standard of tracing to the source; Described voltage transformer (VT) to be detected is connected to the single-phase step-up transformer outgoing side, and its outgoing side provides detected signal for measurement mechanism; Described single phase step-down transformer is connected to the single-phase step-up transformer outgoing side, the output voltage of single-phase step-up transformer is depressurized to the AC side rated voltage of single-phase full-controlled rectifier load per axle; Described single-phase full-controlled rectifier load per axle is connected to the single phase step-down transformer outgoing side, by the variation of its DC side load and the adjustment of trigger angle, changes its AC side harmonic current, makes the variable harmonic voltage of single-phase step-up transformer output; Described measurement mechanism receives the output signal from the trace to the source signal and the voltage transformer (VT) to be detected of capacitive divider low-pressure side, carries out frequency spectrum and error of measurement analysis, thereby obtains the harmonic characteristic of mutual inductor to be checked.
The harmonic characteristic pick-up unit of aforesaid electronic type voltage transformer, it is characterized in that, described measurement mechanism mainly is made up of power supply, signals collecting, data processing, keyboard and liquid crystal display four parts, and wherein: power unit provides dc supply for measurement mechanism; Signals collecting is partly finished conversion, the amplification of trace to the source signal and measuring-signal, is gathered and be converted into digital signal supply data processing section; The data processing section pair digital signal corresponding with trace to the source signal and measuring-signal carried out Fourier analysis, Frequency spectrum ratio and processing such as error of measurement; Keyboard and liquid-crystal display section are realized man-machine interaction.
The present invention also provides a kind of harmonic characteristic detection method of electronic type voltage transformer, adopts aforesaid pick-up unit, and described detection method may further comprise the steps:
Step 1 boosts to the output of pressure regulator the former limit rated voltage of single-phase step-up transformer;
Step 2, loading condiction at the full-controlled rectifier bridge is chosen as under the situation of ohmic load, resistance sense series load and capacitance-resistance shunt load successively, progressively change trigger angle, harmonic components and content in the full-controlled rectifier bridge ac-side current are changed, when the short-circuit impedance of the internal impedance of flow through power frequency supply and pressure regulator and single-phase step-up transformer, produce composition and content variable, with the similar harmonic voltage of electrical network practical operation situation, this harmonic voltage is applied on capacitive divider and the voltage transformer (VT) to be detected;
Step 3, the output signal of trace to the source signal and voltage transformer (VT) to be detected that the capacitive divider low pressure end records is input in the measurement mechanism, by measurement mechanism this two paths of signals is carried out Fourier analysis, decomposite the amplitude and the phase information of the first-harmonic and the each harmonic of two paths of signals, thereby obtain the frequency spectrum of two paths of signals, comprise amplitude spectrum and phase spectrum, with the signal of tracing to the source is benchmark, try to achieve the poor of the amplitude of the first-harmonic of two paths of signals and each harmonic and phase place, thereby obtain the harmonic characteristic of voltage transformer (VT) to be detected.
The invention has the beneficial effects as follows: electronic type voltage transformer harmonic characteristic detection method of the present invention and pick-up unit thereof, utilize the variation of full-controlled rectifier load per axle and the adjustment of trigger angle, produce composition and the variable harmonic current of content in the AC side of full-controlled rectifier bridge, this electric current produces composition on the short-circuit impedance of the internal impedance of power frequency supply and pressure regulator T1 and single-phase step-up transformer T2 and the variable harmonic voltage of content is applied on capacitive divider and the mutual inductor to be detected.This voltage simulates the actual conditions of mains by harmonics voltage truly, by measurement mechanism to capacitive divider low-pressure side the trace to the source frequency spectrum and the error of measurement comparative analysis of signal and voltage transformer (VT) output signal to be checked, can accurately grasp the harmonic response characteristic of voltage transformer (VT), thereby realize accurate measurement harmonic voltage.
Description of drawings
Fig. 1 is the circuit theory diagrams of embodiment of the invention electronic type voltage transformer harmonic characteristic detection method.
Embodiment
Below by embodiment, the invention will be further described in conjunction with the accompanying drawings.
Please refer to Fig. 1, the harmonic characteristic pick-up unit of the electronic type voltage transformer that the embodiment of the invention provides is made up of pressure regulator T1, single-phase step-up transformer T2, capacitive divider, voltage transformer (VT) to be detected, measurement mechanism, single phase step-down transformer T3 and single-phase full-controlled rectifier load per axle.
Described pressure regulator T1, its input side joint industrial frequency experiment power supply, its outgoing side provides adjustable input voltage for single-phase step-up transformer T2.
Described single-phase step-up transformer T2, its input side joint pressure regulator T1 outgoing side boosts to trial voltage with supply voltage.
Described capacitive divider is connected to single-phase step-up transformer T2 outgoing side, for measurement mechanism provides the signal of tracing to the source for measuring the standard of tracing to the source.
Described voltage transformer (VT) to be detected is connected to single-phase step-up transformer T2 outgoing side, and its outgoing side provides detected signal for measurement mechanism.
Described measurement mechanism receives the output signal from the trace to the source signal and the voltage transformer (VT) to be detected of capacitive divider low-pressure side, carries out frequency spectrum and error of measurement analysis, thereby obtains the harmonic characteristic of mutual inductor to be detected.Measurement mechanism mainly is made up of four parts such as power supply, signals collecting, data processing, keyboard and liquid crystal displays.Wherein, power unit provides dc supply for measurement mechanism; Signals collecting is partly finished conversion, the amplification of trace to the source signal and measuring-signal, is gathered and be converted into digital signal supply data processing section; The data processing section pair digital signal corresponding with trace to the source signal and measuring-signal carried out Fourier analysis, Frequency spectrum ratio and processing such as error of measurement; Keyboard and liquid-crystal display section are realized man-machine interaction.
Described single phase step-down transformer T3 is connected to single-phase step-up transformer T2 outgoing side, the output voltage of single-phase step-up transformer T2 is depressurized to the AC side rated voltage of single-phase full-controlled rectifier load per axle.
Described single-phase full-controlled rectifier load per axle is connected to single phase step-down transformer T3 outgoing side, by the variation of its DC side load and the adjustment of trigger angle, changes its AC side harmonic current, makes the variable harmonic voltage of single-phase step-up transformer T2 output.
Please refer to Fig. 1, the electronic type voltage transformer harmonic characteristic detection method that the embodiment of the invention provides adopts above-mentioned electronic type voltage transformer harmonic characteristic pick-up unit, and described detection method may further comprise the steps:
Step 1 boosts to the output of pressure regulator T1 the former limit rated voltage of single-phase step-up transformer T2;
Step 2, loading condiction at the full-controlled rectifier bridge is chosen as under the situation of ohmic load, resistance sense series load and capacitance-resistance shunt load successively, progressively change trigger angle, harmonic components and content in the full-controlled rectifier bridge ac-side current are changed, when the short-circuit impedance of the internal impedance of flow through power frequency supply and pressure regulator T1 and single-phase step-up transformer T2, produce composition and content variable, with the similar harmonic voltage of electrical network practical operation situation, this harmonic voltage is applied on capacitive divider and the voltage transformer (VT) to be detected;
Step 3, the output signal of trace to the source signal and voltage transformer (VT) to be detected that the capacitive divider low pressure end records is input in the measurement mechanism, by measurement mechanism this two paths of signals is carried out Fourier analysis, decomposite the amplitude and the phase information of the first-harmonic and the each harmonic of two paths of signals, thereby obtain the frequency spectrum of two paths of signals, comprise amplitude spectrum and phase spectrum, with the signal of tracing to the source is benchmark, try to achieve the poor of the amplitude of the first-harmonic of two paths of signals and each harmonic and phase place, thereby obtain the harmonic characteristic of voltage transformer (VT) to be detected.
Electronic type voltage transformer harmonic characteristic detection method of the present invention and pick-up unit thereof, utilize the variation of full-controlled rectifier load per axle and the adjustment of trigger angle, produce composition and the variable harmonic current of content in the AC side of full-controlled rectifier bridge, this electric current produces composition on the short-circuit impedance of the internal impedance of power frequency supply and pressure regulator T1 and single-phase step-up transformer T2 and the variable harmonic voltage of content is applied on capacitive divider and the mutual inductor to be checked.This voltage simulates the actual conditions of mains by harmonics voltage truly, by measurement mechanism to capacitive divider low-pressure side the trace to the source frequency spectrum and the error of measurement comparative analysis of signal and voltage transformer (VT) output signal to be checked, can accurately grasp the harmonic response characteristic of voltage transformer (VT), thereby realize accurate measurement harmonic voltage.
Claims (3)
1. the harmonic characteristic pick-up unit of an electronic type voltage transformer is made up of pressure regulator, single-phase step-up transformer, capacitive divider, voltage transformer (VT) to be detected, measurement mechanism, single phase step-down transformer and single-phase full-controlled rectifier load per axle, it is characterized in that:
Described pressure regulator input side joint industrial frequency experiment power supply, its outgoing side provides adjustable input voltage for single-phase step-up transformer; Described single-phase step-up transformer input side joint pressure regulator outgoing side boosts to trial voltage with supply voltage; Described capacitive divider is connected to the single-phase step-up transformer outgoing side, for measurement mechanism provides the signal of tracing to the source for measuring the standard of tracing to the source; Described voltage transformer (VT) to be detected is connected to the single-phase step-up transformer outgoing side, and its outgoing side provides detected signal for measurement mechanism; Described single phase step-down transformer is connected to the single-phase step-up transformer outgoing side, the output voltage of single-phase step-up transformer is depressurized to the AC side rated voltage of single-phase full-controlled rectifier load per axle; Described single-phase full-controlled rectifier load per axle is connected to the single phase step-down transformer outgoing side, by the variation of its DC side load and the adjustment of trigger angle, changes its AC side harmonic current, makes the variable harmonic voltage of single-phase step-up transformer output; Described measurement mechanism receives the output signal from the trace to the source signal and the voltage transformer (VT) to be detected of capacitive divider low-pressure side, carries out frequency spectrum and error of measurement analysis, thereby obtains the harmonic characteristic of mutual inductor to be checked.
2. the harmonic characteristic pick-up unit of electronic type voltage transformer according to claim 1, it is characterized in that, described measurement mechanism mainly is made up of power supply, signals collecting, data processing, keyboard and liquid crystal display four parts, and wherein: power unit provides dc supply for measurement mechanism; Signals collecting is partly finished conversion, the amplification of trace to the source signal and measuring-signal, is gathered and be converted into digital signal supply data processing section; The data processing section pair digital signal corresponding with trace to the source signal and measuring-signal carried out Fourier analysis, Frequency spectrum ratio and processing such as error of measurement; Keyboard and liquid-crystal display section are realized man-machine interaction.
3. the harmonic characteristic detection method of an electronic type voltage transformer adopts pick-up unit as claimed in claim 1, and described detection method may further comprise the steps:
Step 1 boosts to the output of pressure regulator the former limit rated voltage of single-phase step-up transformer;
Step 2, loading condiction at the full-controlled rectifier bridge is chosen as under the situation of ohmic load, resistance sense series load and capacitance-resistance shunt load successively, progressively change trigger angle, harmonic components and content in the full-controlled rectifier bridge ac-side current are changed, when the short-circuit impedance of the internal impedance of flow through power frequency supply and pressure regulator and single-phase step-up transformer, produce composition and content variable, with the similar harmonic voltage of electrical network practical operation situation, this harmonic voltage is applied on capacitive divider and the voltage transformer (VT) to be detected;
Step 3, the output signal of trace to the source signal and voltage transformer (VT) to be detected that the capacitive divider low pressure end records is input in the measurement mechanism, by measurement mechanism this two paths of signals is carried out Fourier analysis, decomposite the amplitude and the phase information of the first-harmonic and the each harmonic of two paths of signals, thereby obtain the frequency spectrum of two paths of signals, comprise amplitude spectrum and phase spectrum, with the signal of tracing to the source is benchmark, try to achieve the poor of the amplitude of the first-harmonic of two paths of signals and each harmonic and phase place, thereby obtain the harmonic characteristic of voltage transformer (VT) to be detected.
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| CN103048637A (en) * | 2012-12-19 | 2013-04-17 | 华北电力大学 | Method for testing broadband characteristic of CVT (capacitor voltage transformer) by high voltage harmonic |
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| CN103499800A (en) * | 2013-09-09 | 2014-01-08 | 国家电网公司 | Frequency characteristic detecting system of electronic type voltage transformer |
| CN103630866A (en) * | 2013-09-09 | 2014-03-12 | 国家电网公司 | Transient characteristic detection system and transient characteristic detection method for electronic voltage transformers |
| CN103675563A (en) * | 2013-12-31 | 2014-03-26 | 杭州得诚电力科技有限公司 | Energy-saving multifunctional power test system |
| CN104104259A (en) * | 2013-04-15 | 2014-10-15 | 锐珂（上海）医疗器材有限公司 | High frequency DC high voltage generator |
| CN104181417A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Large-current synthesis transient state circuit for electronic current transformer |
| CN105277914A (en) * | 2015-11-09 | 2016-01-27 | 中国矿业大学 | Capacitive voltage transformer (CVT) harmonic measurement error correction device |
| CN105353333A (en) * | 2015-11-04 | 2016-02-24 | 重庆大学 | Transfer characteristic detection method for electromagnetic current transformer |
| CN106569065A (en) * | 2016-11-03 | 2017-04-19 | 国网浙江省电力公司舟山供电公司 | DC cable thermal cycle voltage test device |
| 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 |
| CN107579665A (en) * | 2017-09-30 | 2018-01-12 | 广东电网有限责任公司电力科学研究院 | A kind of high pressure harmonic voltage source |
| CN109085527A (en) * | 2018-08-17 | 2018-12-25 | 国网江苏省电力有限公司盐城供电分公司 | Capacitance type potential transformer harmonic propagation characteristic measuring system |
| CN111044782A (en) * | 2019-12-12 | 2020-04-21 | 中国电力科学研究院有限公司 | System and method for measuring frequency characteristic of capacitive voltage divider |
| CN115494377A (en) * | 2022-06-02 | 2022-12-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Implementation method and device of boost injection type harmonic current source |
| CN115494377B (en) * | 2022-06-02 | 2024-07-05 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for realizing boost injection type harmonic current source |
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| CN103048637A (en) * | 2012-12-19 | 2013-04-17 | 华北电力大学 | Method for testing broadband characteristic of CVT (capacitor voltage transformer) by high voltage harmonic |
| CN104104259A (en) * | 2013-04-15 | 2014-10-15 | 锐珂（上海）医疗器材有限公司 | High frequency DC high voltage generator |
| CN103364604B (en) * | 2013-07-30 | 2016-06-29 | 武汉大学 | Capacitance type potential transformer and measuring method suitable in high-voltage harmonic measurement |
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| CN103499800A (en) * | 2013-09-09 | 2014-01-08 | 国家电网公司 | Frequency characteristic detecting system of electronic type voltage transformer |
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| CN105277914A (en) * | 2015-11-09 | 2016-01-27 | 中国矿业大学 | Capacitive voltage transformer (CVT) harmonic measurement error correction device |
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| 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 |
| CN107579665A (en) * | 2017-09-30 | 2018-01-12 | 广东电网有限责任公司电力科学研究院 | A kind of high pressure harmonic voltage source |
| CN109085527A (en) * | 2018-08-17 | 2018-12-25 | 国网江苏省电力有限公司盐城供电分公司 | Capacitance type potential transformer harmonic propagation characteristic measuring system |
| CN111044782A (en) * | 2019-12-12 | 2020-04-21 | 中国电力科学研究院有限公司 | System and method for measuring frequency characteristic of capacitive voltage divider |
| CN111044782B (en) * | 2019-12-12 | 2022-05-13 | 中国电力科学研究院有限公司 | System and method for measuring frequency characteristic of capacitive voltage divider |
| CN115494377A (en) * | 2022-06-02 | 2022-12-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Implementation method and device of boost injection type harmonic current source |
| CN115494377B (en) * | 2022-06-02 | 2024-07-05 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for realizing boost injection type harmonic current source |
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