CN102269787B - 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 PDF

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CN102269787B
CN102269787B CN2011101245360A CN201110124536A CN102269787B CN 102269787 B CN102269787 B CN 102269787B CN 2011101245360 A CN2011101245360 A CN 2011101245360A CN 201110124536 A CN201110124536 A CN 201110124536A CN 102269787 B CN102269787 B CN 102269787B
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transformer
voltage
phase
harmonic
measurement
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CN102269787A (en
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冯宇
吴士普
毛安澜
陈晓明
李璿
汪本进
余春雨
费烨
王玲
王晓琪
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State Grid Electric Power Research Institute
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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

Harmonic characteristic of electronic voltage transformer detection method and pick-up unit thereof
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 of realizing harmonic voltage is carried out Measurement accuracy.
Background technology
Current, along with being on the increase of nonlinear load, the harmonic problem in electric system is day by day serious, and electric energy metrical has been produced impact very significantly, 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 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 affect relay protection, causes the measuring error of the protection algorithm take the power frequency amount as parameter, the accuracy of impact protection algorithm, causes 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 of harmonic wave Measurement accuracy.Therefore, the harmonic characteristic of electric power mutual-inductor detected, grasps its harmonic response performance and have the important theory significance and practice significance.
At present the mutual inductor harmonic characteristic is detected the domestic standard that proposes regulation few, " GB/T20840.8-2007 mutual inductor the 8th part: electronic current mutual inductor " proposed harmonic response and the harmonic wave accuracy requirement of electronic current and voltage transformer (VT), regulation " consider 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 electrical network, is also 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 of realizing harmonic voltage is carried out Measurement accuracy, to satisfy the commercial Application needs.
Summary of the invention
Technical matters to be solved by this invention is: detect in order to solve existing harmonic characteristic to electronic type voltage transformer the problem that lacks effective detection method and pick-up unit, the invention provides a kind of harmonic characteristic detection method of electronic type voltage transformer, its harmonic source part can produce can Reality simulation mains by harmonics voltage rated voltage and the superimposed primary voltage of each harmonic voltage, its pick-up unit can be measured electronic type voltage transformer to the frequency characteristic of each harmonic voltage, realizes the Measurement accuracy to harmonic voltage in electric system.
The technical solution adopted in the present invention is: a kind of detection device of harmonic characteristic of electronic type voltage transformer, formed 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 tracing signal 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 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 harmonic current, makes the variable harmonic voltage of single-phase step-up transformer output; Described measurement mechanism receives the output signal from tracing 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 detection device of harmonic characteristic of electronic type voltage transformer as above, it is characterized in that, described measurement mechanism mainly is comprised 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 completed the conversion of tracing signal and measuring-signal, amplification, is gathered and be converted into digital signal supply data processing section; The data processing section pair digital signal corresponding with tracing signal and measuring-signal carried out Fourier analysis, Frequency spectrum ratio and the 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 pick-up unit as above, and described detection method comprises the following steps:
Step 1 boosts to the output of pressure regulator the former limit rated voltage of single-phase step-up transformer;
Step 2, in the situation that the loading condiction of full-controlled rectifier bridge is chosen as ohmic load, resistance sense series load and capacitance-resistance shunt load successively, progressively change Trigger Angle, harmonic components and content in full-controlled rectifier bridge ac-side current are changed, produce when the short-circuit impedance of the internal impedance of flow through power frequency supply and pressure regulator and single-phase step-up transformer composition and content variable, with the similar harmonic voltage of electrical network practical operation situation, this harmonic voltage is applied on capacitive divider and voltage transformer (VT) to be detected;
Step 3, the tracing signal that the capacitive divider low pressure end records and the output signal of voltage transformer (VT) to be detected are input in measurement mechanism, by measurement mechanism, this two paths of signals is carried out Fourier analysis, decomposite amplitude and the phase information of 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, take tracing signal as 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: harmonic characteristic of electronic voltage transformer 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 at the AC 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 mutual inductor to be detected.This voltage simulates the actual conditions of mains by harmonics voltage truly, by frequency spectrum and the error of measurement comparative analysis of measurement mechanism to capacitive divider low-pressure side tracing signal and voltage transformer (VT) output signal to be checked, can accurately grasp the harmonic response characteristic of voltage transformer (VT), thereby realize the accurate measurement to harmonic voltage.
Description of drawings
Fig. 1 is the circuit theory diagrams of embodiment of the present invention harmonic characteristic of electronic voltage transformer detection method.
Embodiment
Below by embodiment, the invention will be further described by reference to the accompanying drawings.
Please refer to Fig. 1, the detection device of harmonic characteristic of the electronic type voltage transformer that the embodiment of the present invention provides is comprised 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 tracing signal 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 tracing 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 comprised 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 completed the conversion of tracing signal and measuring-signal, amplification, is gathered and be converted into digital signal supply data processing section; The data processing section pair digital signal corresponding with tracing signal and measuring-signal carried out Fourier analysis, Frequency spectrum ratio and the 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 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 harmonic current, makes the variable harmonic voltage of single-phase step-up transformer T2 output.
Please refer to Fig. 1, the harmonic characteristic of electronic voltage transformer detection method that the embodiment of the present invention provides adopts above-mentioned detection device of harmonic characteristic of electronic voltage transformer, and described detection method comprises the following 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, in the situation that the loading condiction of full-controlled rectifier bridge is chosen as ohmic load, resistance sense series load and capacitance-resistance shunt load successively, progressively change Trigger Angle, harmonic components and content in full-controlled rectifier bridge ac-side current are changed, produce 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 composition and content variable, with the similar harmonic voltage of electrical network practical operation situation, this harmonic voltage is applied on capacitive divider and voltage transformer (VT) to be detected;
Step 3, the tracing signal that the capacitive divider low pressure end records and the output signal of voltage transformer (VT) to be detected are input in measurement mechanism, by measurement mechanism, this two paths of signals is carried out Fourier analysis, decomposite amplitude and the phase information of 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, take tracing signal as 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.
Harmonic characteristic of electronic voltage transformer 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 at the AC 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 mutual inductor to be checked.This voltage simulates the actual conditions of mains by harmonics voltage truly, by frequency spectrum and the error of measurement comparative analysis of measurement mechanism to capacitive divider low-pressure side tracing signal and voltage transformer (VT) output signal to be checked, can accurately grasp the harmonic response characteristic of voltage transformer (VT), thereby realize the accurate measurement to harmonic voltage.

Claims (3)

1. the detection device of harmonic characteristic of an electronic type voltage transformer, be comprised 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 tracing signal 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 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 harmonic current, makes the variable harmonic voltage of single-phase step-up transformer output; Described measurement mechanism receives the output signal from tracing 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 detection device of harmonic characteristic of electronic type voltage transformer according to claim 1, it is characterized in that, described measurement mechanism mainly is comprised 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 completed the conversion of tracing signal and measuring-signal, amplification, is gathered and be converted into digital signal supply data processing section; The data processing section pair digital signal corresponding with tracing signal and measuring-signal carried out Fourier analysis, Frequency spectrum ratio and error of measurement is processed; Keyboard and liquid-crystal display section are realized man-machine interaction.
3. the harmonic characteristic detection method of an electronic type voltage transformer, adopt pick-up unit as claimed in claim 1, and described detection method comprises the following steps:
Step 1 boosts to the output of pressure regulator the former limit rated voltage of single-phase step-up transformer;
Step 2, in the situation that the loading condiction of full-controlled rectifier bridge is chosen as ohmic load, resistance sense series load and capacitance-resistance shunt load successively, progressively change Trigger Angle, harmonic components and content in full-controlled rectifier bridge ac-side current are changed, produce when the short-circuit impedance of the internal impedance of flow through power frequency supply and pressure regulator and single-phase step-up transformer composition and content variable, with the similar harmonic voltage of electrical network practical operation situation, this harmonic voltage is applied on capacitive divider and voltage transformer (VT) to be detected;
Step 3, the tracing signal that the capacitive divider low pressure end records and the output signal of voltage transformer (VT) to be detected are input in measurement mechanism, by measurement mechanism, this two paths of signals is carried out Fourier analysis, decomposite amplitude and the phase information of 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, take tracing signal as 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.
CN2011101245360A 2011-05-16 2011-05-16 Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof Active CN102269787B (en)

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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
CN103499800B (en) * 2013-09-09 2016-10-12 国家电网公司 The frequency characteristic detecting system of electronic type voltage transformer
CN103630866B (en) * 2013-09-09 2016-05-25 国家电网公司 Transient characterisitics detection system and the method for electronic type voltage transformer
CN103675563B (en) * 2013-12-31 2016-09-21 杭州得诚电力科技股份有限公司 Energy-saving multifunction power test system
CN105353333A (en) * 2015-11-04 2016-02-24 重庆大学 Transfer characteristic detection method for electromagnetic 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
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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