CN111208468A - Harmonic performance tester for electronic voltage transformer - Google Patents

Harmonic performance tester for electronic voltage transformer Download PDF

Info

Publication number
CN111208468A
CN111208468A CN201811390109.5A CN201811390109A CN111208468A CN 111208468 A CN111208468 A CN 111208468A CN 201811390109 A CN201811390109 A CN 201811390109A CN 111208468 A CN111208468 A CN 111208468A
Authority
CN
China
Prior art keywords
voltage
transformer
phase
harmonic
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811390109.5A
Other languages
Chinese (zh)
Inventor
陈振坤
Original Assignee
陈振坤
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 陈振坤 filed Critical 陈振坤
Priority to CN201811390109.5A priority Critical patent/CN111208468A/en
Publication of CN111208468A publication Critical patent/CN111208468A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16Spectrum analysis; Fourier analysis

Abstract

The invention provides an electronic voltage transformer harmonic performance tester, which comprises a voltage regulator T1, a single-phase step-up transformer T2, a capacitive voltage divider, a voltage transformer to be detected and a single-phase step-down transformer T3, wherein the input side of the voltage regulator T1 is connected with a power frequency test power supply, the single-phase step-up transformer T2 is connected with the output side of T1 and is used for stepping up the power supply voltage to a test voltage, the capacitive voltage divider is connected with the output side of T2, the voltage transformer to be detected and the single-phase step-down transformer T3 are. According to the harmonic characteristic detection method of the electronic voltage transformer, the harmonic source part can generate primary voltage which can simulate the superposition of the rated voltage of the harmonic voltage of a real power grid and each subharmonic voltage, and the detection device can detect the frequency characteristic of the electronic voltage transformer to each subharmonic voltage, so that the harmonic voltage can be accurately measured in a power system.

Description

Harmonic performance tester for electronic voltage transformer
Technical Field
The invention relates to a harmonic characteristic detection method and a detection device of an electronic voltage transformer, belongs to the technical field of power measurement, and particularly relates to a detection method and a detection device capable of accurately detecting harmonic characteristics of the electronic voltage transformer and finally accurately measuring harmonic voltage.
Background
Currently, with the increase of nonlinear loads, harmonic problems in an electric power system become more serious, which has a significant impact on electric energy metering, and causes numerous problems such as metering modes, metering algorithms, and increasing metering errors of existing metering devices. The main cause of these problems, apart from the factors that the harmonic active power is not zero, is the difference in the harmonic response characteristics of the metering devices. In addition, the harmonic wave can also affect the relay protection, cause the measurement error of the protection algorithm taking the power frequency as a parameter, affect the accuracy of the protection algorithm, and cause the protection malfunction or failure. The power transformer is used as a core element of electric energy metering, and the harmonic response characteristic of the power transformer is a key factor for accurate harmonic measurement. Therefore, the method has important theoretical significance and practical significance for detecting the harmonic characteristics of the power transformer and mastering the harmonic response performance of the power transformer.
At present, few domestic standards are provided for detecting harmonic characteristics of transformers, and the 8 th part of GB/T20840.8-2007 transformers: the electronic current transformer ' proposes the harmonic response and harmonic accuracy requirements of the electronic current and voltage transformer, and stipulates ' from practical consideration, it is acceptable that the test of the measurement accuracy of each subharmonic is applied with a single harmonic frequency on the primary side only '. However, for electronic current transformers, the standard also states: ideally, the harmonic test should superimpose the required harmonic frequency components on the rated frequency and rated primary current. This is because the superposition of the rated primary current with the individual harmonic components is an objective reflection of the true harmonics in the network, as is the case for the harmonic voltages.
In view of the above, it is necessary to provide a detection method and a detection apparatus thereof, which can accurately detect the harmonic characteristics of the electronic voltage transformer and finally realize accurate measurement of the harmonic voltage, so as to meet the needs of industrial application.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problem that an effective detection method and a detection device are lacked in the conventional harmonic characteristic detection of an electronic voltage transformer, the invention provides the harmonic performance tester of the electronic voltage transformer.
The technical scheme adopted by the invention is as follows: the utility model provides an electronic voltage transformer's harmonic characteristic detection device, by voltage regulator, single-phase step-up transformer, capacitive voltage divider, wait to detect voltage transformer, measuring device, single-phase step-down transformer and single-phase full controlled rectifier bridge load and constitute its characterized in that:
the input side of the voltage regulator is connected with a power frequency test power supply, and the output side of the voltage regulator provides adjustable input voltage for the single-phase step-up transformer; the input side of the single-phase booster transformer is connected with the output side of a voltage regulator, and the power supply voltage is boosted to the test voltage; the capacitive voltage divider is a measurement traceability standard, is connected to the output side of the single-phase step-up transformer and provides traceability signals for the measurement device; the voltage transformer to be detected is connected to the output side of the single-phase step-up transformer, and the output side of the voltage transformer to be detected provides a detected signal for the measuring device; the single-phase step-down transformer is connected to the output side of the single-phase step-up transformer, and the output voltage of the single-phase step-up transformer is reduced to the rated voltage of the alternating current side of the single-phase full-control rectifier bridge load; the single-phase full-control rectifier bridge load is connected to the output side of the single-phase step-down transformer, and the harmonic current at the alternating current side of the single-phase full-control rectifier bridge load is changed through the change of the load at the direct current side and the adjustment of a trigger angle, so that the single-phase step-up transformer outputs variable harmonic voltage; the measuring device receives a tracing signal from the low-voltage side of the capacitive voltage divider and an output signal of the voltage transformer to be detected, and performs frequency spectrum and difference measurement analysis, so that the harmonic characteristic of the transformer to be detected is obtained.
The harmonic characteristic detection device of the electronic voltage transformer is characterized in that the measuring device mainly comprises a power supply, a signal acquisition unit, a data processing unit, a keyboard and a liquid crystal display unit, wherein: the power supply part provides a direct current working power supply for the measuring device; the signal acquisition part completes the conversion, amplification and acquisition of the tracing signal and the measuring signal and converts the tracing signal and the measuring signal into a digital signal to be supplied to the data processing part; the data processing part carries out Fourier analysis, frequency spectrum comparison, difference measurement and other processing on the digital signals corresponding to the tracing signal and the measuring signal; the keyboard and the liquid crystal display part realize human-computer interaction.
The invention also provides a harmonic characteristic detection method of the electronic voltage transformer, which adopts the detection device and comprises the following steps:
step 1, boosting the output of a voltage regulator to the primary side rated voltage of a single-phase boosting transformer;
step 2, under the condition that the load conditions of the full-control rectifier bridge are sequentially selected to be a resistance load, a resistance-inductance series load and a resistance-capacitance parallel load, gradually changing a trigger angle to change harmonic components and content in alternating-current side current of the full-control rectifier bridge, generating harmonic voltage which has variable components and content and is similar to the actual operation condition of a power grid when the harmonic voltage flows through an industrial frequency power supply, internal impedance of a voltage regulator and short-circuit impedance of a single-phase step-up transformer, and applying the harmonic voltage to a capacitive voltage divider and a voltage transformer to be detected;
and 3, inputting the tracing signal measured by the low-voltage end of the capacitive voltage divider and the output signal of the voltage transformer to be detected into a measuring device, carrying out Fourier analysis on the two paths of signals by the measuring device, decomposing the amplitude and phase information of the fundamental wave and each harmonic of the two paths of signals, thereby obtaining the frequency spectrums of the two paths of signals, including the amplitude spectrum and the phase spectrum, and solving the difference between the amplitude and the phase of the fundamental wave and each harmonic of the two paths of signals by taking the tracing signal as a reference, thereby obtaining the harmonic characteristic of the voltage transformer to be detected.
The invention has the beneficial effects that: the invention relates to a method and a device for detecting harmonic characteristics of an electronic voltage transformer, which utilize the change of a load of a full-control rectifier bridge and the adjustment of a trigger angle to generate harmonic current with variable components and content on the alternating current side of the full-control rectifier bridge, and the harmonic current generates harmonic voltage with variable components and content on the internal impedance of a power frequency power supply and a voltage regulator T1 and the short-circuit impedance of a single-phase step-up transformer T2 and is applied to a capacitive voltage divider and the transformer to be detected. The voltage truly simulates the actual condition of the harmonic voltage of the power grid, and the harmonic response characteristic of the voltage transformer can be accurately mastered through the frequency spectrum and the difference measurement contrast analysis of the low-voltage side tracing signal of the capacitive voltage divider and the output signal of the voltage transformer to be detected, so that the harmonic voltage can be accurately measured.
Drawings
Fig. 1 is a schematic circuit diagram of a method for detecting harmonic characteristics of an electronic voltage transformer according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following detailed description and accompanying drawings.
Referring to fig. 1, the harmonic characteristic detection device of the electronic voltage transformer provided in the embodiment of the present invention includes a voltage regulator T1, a single-phase step-up transformer T2, a capacitive voltage divider, a voltage transformer to be detected, a measurement device, a single-phase step-down transformer T3, and a single-phase fully-controlled rectifier bridge load.
The input side of the voltage regulator T1 is connected with a power frequency test power supply, and the output side of the voltage regulator T1 provides adjustable input voltage for the single-phase step-up transformer T2.
The input side of the single-phase step-up transformer T2 is connected with the output side of a voltage regulator T1, and the single-phase step-up transformer boosts the power supply voltage to a test voltage.
The capacitive voltage divider is used for measuring traceability standards, is connected to the output side of the single-phase step-up transformer T2 and provides traceability signals for the measuring device.
The voltage transformer to be detected is connected to the output side of the single-phase step-up transformer T2, and the output side of the voltage transformer to be detected provides detected signals for the measuring device.
The measuring device receives the tracing signal from the low-voltage side of the capacitive voltage divider and the output signal of the voltage transformer to be detected, and carries out frequency spectrum and difference measurement analysis, so that the harmonic characteristic of the transformer to be detected is obtained. The measuring device mainly comprises a power supply, signal acquisition, data processing, a keyboard and liquid crystal display. The power supply part provides a direct current working power supply for the measuring device; the signal acquisition part completes the conversion, amplification and acquisition of the tracing signal and the measuring signal and converts the tracing signal and the measuring signal into a digital signal to be supplied to the data processing part; the data processing part carries out Fourier analysis, frequency spectrum comparison, difference measurement and other processing on the digital signals corresponding to the tracing signal and the measuring signal; the keyboard and the liquid crystal display part realize human-computer interaction.
The single-phase step-down transformer T3 is connected to the output side of the single-phase step-up transformer T2, and the output voltage of the single-phase step-up transformer T2 is stepped down to the rated voltage of the alternating current side of the single-phase full-control rectifier bridge load.
The single-phase full-control rectifier bridge load is connected to the output side of the single-phase step-down transformer T3, and the harmonic current at the alternating current side is changed through the change of the load at the direct current side and the adjustment of the trigger angle, so that the single-phase step-up transformer T2 outputs variable harmonic voltage.
Referring to fig. 1, the method for detecting harmonic characteristics of an electronic voltage transformer according to the embodiment of the present invention employs the above apparatus for detecting harmonic characteristics of an electronic voltage transformer, and the method includes the following steps:
step 1, boosting the output of a voltage regulator T1 to the primary rated voltage of a single-phase booster transformer T2;
step 2, under the condition that the load conditions of the full-control rectifier bridge are sequentially selected to be a resistance load, a resistance-inductance series load and a resistance-capacitance parallel load, gradually changing a trigger angle to change harmonic components and contents in alternating-current side current of the full-control rectifier bridge, generating harmonic voltage which has variable components and contents and is similar to the actual operation condition of a power grid when the harmonic voltage flows through an industrial frequency power supply, an internal impedance of a voltage regulator T1 and a short-circuit impedance of a single-phase step-up transformer T2, and applying the harmonic voltage to a capacitive voltage divider and a voltage transformer to be detected;
and 3, inputting the tracing signal measured by the low-voltage end of the capacitive voltage divider and the output signal of the voltage transformer to be detected into a measuring device, carrying out Fourier analysis on the two paths of signals by the measuring device, decomposing the amplitude and phase information of the fundamental wave and each harmonic of the two paths of signals, thereby obtaining the frequency spectrums of the two paths of signals, including the amplitude spectrum and the phase spectrum, and solving the difference between the amplitude and the phase of the fundamental wave and each harmonic of the two paths of signals by taking the tracing signal as a reference, thereby obtaining the harmonic characteristic of the voltage transformer to be detected.
The invention relates to a method and a device for detecting harmonic characteristics of an electronic voltage transformer, which utilize the load change of a full-control rectifier bridge and the adjustment of a trigger angle to generate harmonic current with variable components and content on the alternating current side of the full-control rectifier bridge, and the harmonic current generates harmonic voltage with variable components and content on the internal impedance of a power frequency power supply and a voltage regulator T1 and the short-circuit impedance of a single-phase step-up transformer T2 and is applied to a capacitive voltage divider and the transformer to be detected. The voltage truly simulates the actual condition of the harmonic voltage of the power grid, and the harmonic response characteristic of the voltage transformer can be accurately mastered through the frequency spectrum and the difference measurement contrast analysis of the low-voltage side tracing signal of the capacitive voltage divider and the output signal of the voltage transformer to be detected, so that the harmonic voltage can be accurately measured.

Claims (2)

1. The utility model provides an electronic type voltage transformer harmonic performance tester, by voltage regulator, single-phase step-up transformer, capacitive voltage divider, wait to detect voltage transformer, measuring device, single-phase step-down transformer and single-phase full controlled rectifier bridge load and constitute its characterized in that:
the input side of the voltage regulator is connected with a power frequency test power supply, and the output side of the voltage regulator provides adjustable input voltage for the single-phase step-up transformer; the input side of the single-phase booster transformer is connected with the output side of a voltage regulator, and the power supply voltage is boosted to the test voltage; the capacitive voltage divider is a measurement traceability standard, is connected to the output side of the single-phase step-up transformer and provides traceability signals for the measurement device; the voltage transformer to be detected is connected to the output side of the single-phase step-up transformer, and the output side of the voltage transformer to be detected provides a detected signal for the measuring device; the single-phase step-down transformer is connected to the output side of the single-phase step-up transformer, and the output voltage of the single-phase step-up transformer is reduced to the rated voltage of the alternating current side of the single-phase full-control rectifier bridge load; the single-phase full-control rectifier bridge load is connected to the output side of the single-phase step-down transformer, and the harmonic current at the alternating current side of the single-phase full-control rectifier bridge load is changed through the change of the load at the direct current side and the adjustment of a trigger angle, so that the single-phase step-up transformer outputs variable harmonic voltage; the measuring device receives a tracing signal from the low-voltage side of the capacitive voltage divider and an output signal of the voltage transformer to be detected, and performs frequency spectrum and difference measurement analysis, so that the harmonic characteristic of the transformer to be detected is obtained.
2. The harmonic performance tester of the electronic voltage transformer of claim 1, wherein the measuring device is mainly composed of four parts, namely a power supply, signal acquisition, data processing, a keyboard and a liquid crystal display, wherein: the power supply part provides a direct current working power supply for the measuring device; the signal acquisition part completes the conversion, amplification and acquisition of the tracing signal and the measuring signal and converts the tracing signal and the measuring signal into a digital signal to be supplied to the data processing part; the data processing part carries out Fourier analysis, frequency spectrum comparison and difference measurement processing on digital signals corresponding to the tracing signal and the measuring signal; the keyboard and the liquid crystal display part realize human-computer interaction.
CN201811390109.5A 2018-11-21 2018-11-21 Harmonic performance tester for electronic voltage transformer Pending CN111208468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811390109.5A CN111208468A (en) 2018-11-21 2018-11-21 Harmonic performance tester for electronic voltage transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811390109.5A CN111208468A (en) 2018-11-21 2018-11-21 Harmonic performance tester for electronic voltage transformer

Publications (1)

Publication Number Publication Date
CN111208468A true CN111208468A (en) 2020-05-29

Family

ID=70789168

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811390109.5A Pending CN111208468A (en) 2018-11-21 2018-11-21 Harmonic performance tester for electronic voltage transformer

Country Status (1)

Country Link
CN (1) CN111208468A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111856202A (en) * 2020-06-05 2020-10-30 广东省永固电力科技有限公司 Low-voltage line detection terminal for realizing automatic topology identification based on XML (extensive markup language) file

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111856202A (en) * 2020-06-05 2020-10-30 广东省永固电力科技有限公司 Low-voltage line detection terminal for realizing automatic topology identification based on XML (extensive markup language) file
CN111856202B (en) * 2020-06-05 2021-03-30 广东省永固电力科技有限公司 Low-voltage line detection terminal for realizing automatic topology identification based on XML (extensive markup language) file

Similar Documents

Publication Publication Date Title
CN101149425B (en) Electronic electric energy meter debugging, checkout automated system
CN103513211B (en) Ac impedance measurement measuring device
CN100520437C (en) Integrated detecting and measuring method for metering property of high voltage power meter
CN102269787B (en) Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof
CN201867490U (en) Calibration device for multiepitope standard electric energy meters
CN103199514B (en) Method of eliminating ferromagnetic resonances
CN101251585A (en) Method and apparatus for checking global error of high voltage energy metering installation
Yildirim et al. FPGA-based online power quality monitoring system for electrical distribution network
CN101441231A (en) Harmonic electric energy metering error analytical apparatus
CN107505499A (en) For the current transformer and the method and apparatus of the phase error of power-measuring device for learning to include current transformer error correction
CN201191317Y (en) Global error in-situ detection apparatus for electric metering cabinet
CN201540366U (en) Three-phase harmonic standard calibration and verification device
CN102928803B (en) Electronic transformer checking device based on synchronization pulse output power supply
CN201188128Y (en) Automatization system for debugging and checking electronic type electric energy meter
CN101329374A (en) Computation method of differential filter weighting period small amplitude value
CN107942192A (en) A kind of controller switching equipment CT automatic test approach and system
CN102385013B (en) Method and device for detecting harmonic characteristic of electronic current transformer
CN103344937B (en) Intelligent electric energy meter consumption detection equipment and detection method
CN111208468A (en) Harmonic performance tester for electronic voltage transformer
CN102866378A (en) Voltage or current transformer on-line test device and voltage or current transformer on-line test method
CN101950009A (en) Three-phase intelligent transformer calibrator
CN109581265B (en) Method for detecting direct current resistance of current transformer based on power error
Kabalci et al. A low cost smart metering system design for smart grid applications
CN204129201U (en) A kind of high-voltage electric energy measurement equipment error pick-up unit
CN204142945U (en) Multi-function calibrator

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication