CN108037475B - Harmonic transfer characteristic test system for capacitor voltage transformer - Google Patents

Harmonic transfer characteristic test system for capacitor voltage transformer Download PDF

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CN108037475B
CN108037475B CN201711132870.4A CN201711132870A CN108037475B CN 108037475 B CN108037475 B CN 108037475B CN 201711132870 A CN201711132870 A CN 201711132870A CN 108037475 B CN108037475 B CN 108037475B
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voltage transformer
harmonic
secondary side
square wave
voltage
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CN108037475A (en
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沈敏轩
王同勋
刘颖英
谈萌
李亚琼
冯丹丹
李毅
安哲
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
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    • 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

Abstract

The invention provides a harmonic transfer characteristic test system of a capacitor voltage transformer, which comprises an input module, a boosting module, a processing module and a correction module. The waveform generator generates square wave signals, the frequency components of the square wave signals are not single, meanwhile, the waveform generator can be used for independently analyzing the transmission characteristics of each subharmonic, the operation is simple and convenient, and the workload is low. According to the technical scheme provided by the invention, the measurement error of the capacitor voltage transformer is obtained through the harmonic transmission characteristic curve of the capacitance voltage transformer, the error correction coefficient of the capacitor voltage transformer is calculated according to the measurement error of the capacitor voltage transformer, and the harmonic voltage measured on the secondary side is corrected through the error correction coefficient of the capacitor voltage transformer, so that the problem of harmonic measurement distortion of the capacitor voltage transformer in the prior art is solved.

Description

Harmonic transfer characteristic test system for capacitor voltage transformer
Technical Field
The invention relates to a test system, in particular to a harmonic transfer characteristic test system of a capacitor voltage transformer.
Background
In a power grid, on the spot of applying a Capacitive Voltage Transformer (CVT), measurement data of harmonic Voltage generally comes from the capacitive Voltage transformer, and because a capacitance unit and an electromagnetic unit contained in the capacitive Voltage transformer form a resonant circuit, the frequency response of the capacitive Voltage transformer is only suitable for measurement of rated power frequency, and there is an accurate transformation ratio relation under fundamental frequency, but generally cannot meet the accurate requirement of fundamental frequency for each subharmonic transformation ratio, and the transformation ratios are different under each frequency. The transmission of harmonic waves by the capacitor voltage transformer is actually changed in a nonlinear manner, the secondary side harmonic voltage of the capacitor voltage transformer cannot reflect the harmonic wave condition of the high-voltage side according to a rated transformation ratio, and although the precision of low-voltage side harmonic wave measuring equipment can meet the requirement, the distorted secondary side harmonic wave voltage level of the capacitor voltage transformer can be reduced. Therefore, the voltage content of each subharmonic and the total voltage harmonic distortion rate in the power grid measured by the capacitor voltage transformer have errors, and the actual harmonic level in the power grid cannot be truly reflected.
In the existing capacitive voltage transformer test system, a harmonic signal generating device is mostly adopted for signal input, and the harmonic waves need to be accurately adjusted and tested one by one, so that a large amount of repeated work can be generated, and the waste of time and energy is caused. In addition, the existing test system mostly adopts an electromagnetic voltage transformer as a standard output device for comparing with the measurement result of the capacitor voltage transformer. The electromagnetic voltage transformer is complex in insulation structure and large in size, and a magnetic circuit is saturated due to non-periodic components in short-circuit current, so that the measurement accuracy of the electromagnetic voltage transformer is influenced, and the error correction accuracy of the capacitor voltage transformer is low. Meanwhile, although the influence of harmonic waves on the measurement of the capacitor voltage transformer is researched by the conventional test system, the transfer characteristic rule of the harmonic waves passing through the capacitor voltage transformer cannot be given, and the harmonic wave measurement distortion problem of the capacitor voltage transformer still exists.
Disclosure of Invention
In order to overcome the defects of low accuracy of error correction of the capacitor voltage transformer and harmonic measurement distortion of the capacitor voltage transformer in the prior art, the invention provides a harmonic transmission characteristic test system of the capacitor voltage transformer, which comprises an input module, a boosting module, a processing module and a correction module, wherein the input module is used for generating a square wave signal and sending the square wave signal to the boosting module, the boosting module is used for boosting the square wave signal and sending the boosted square wave signal to the processing module, the processing module is used for outputting secondary side standard harmonic voltage and secondary side measured harmonic voltage according to the square wave signal and generating a harmonic transmission characteristic curve of the capacitance-resistance voltage transformer according to the secondary side standard harmonic voltage, the correction module is used for correcting the secondary side measured harmonic voltage according to the harmonic transmission characteristic curve of the capacitance-resistance voltage transformer, and the secondary side measured harmonic voltage is corrected through the harmonic transmission characteristic curve of the capacitance-resistance voltage transformer, the accuracy of the secondary side measured harmonic voltage of the corrected capacitor voltage transformer is high.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a harmonic wave transfer characteristic test system of a capacitor voltage transformer, which comprises:
the input module is used for generating a square wave signal and sending the square wave signal to the boosting module;
the voltage boosting module is used for boosting the square wave signals and sending the boosted square wave signals to the processing module;
the processing module is used for outputting the secondary side standard harmonic voltage and the secondary side measured harmonic voltage according to the square wave signal and generating a harmonic transmission characteristic curve of the resistance-capacitance voltage transformer according to the secondary side standard harmonic voltage;
and the correction module is used for correcting the secondary side measured harmonic voltage according to the harmonic transmission characteristic curve of the resistance-capacitance voltage transformer.
The input module comprises a waveform generator, and the waveform generator generates a square wave signal and sends the square wave signal to the boosting module.
The boosting module comprises a boosting transformer, the boosting transformer receives the square wave signals sent by the input module, boosts the square wave signals to the test set voltage, and sends the square wave signals boosted to the test set voltage to the processing module.
The capacity of the boosting transformer is not lower than 1000 kVA.
The processing module comprises a resistance-capacitance voltage transformer, a capacitance voltage transformer and a waveform analyzer.
And the resistance-capacitance voltage transformer receives the square wave signal sent by the boosting module and outputs the secondary side standard harmonic voltage to the waveform analyzer.
The capacitor voltage transformer receives the square wave signal sent by the boosting module and outputs the secondary side measured harmonic voltage to the waveform analyzer.
The waveform analyzer receives the secondary side standard harmonic voltage and the secondary side measured harmonic voltage, and respectively generates a harmonic transfer characteristic curve of the resistance-capacitance voltage transformer and a harmonic transfer characteristic curve of the capacitance voltage transformer according to the secondary side standard harmonic voltage and the secondary side measured harmonic voltage.
The correction module comprises:
the comparison unit is used for comparing the harmonic transfer characteristic curve of the resistance-capacitance voltage transformer with the harmonic transfer characteristic curve of the capacitance voltage transformer to obtain the measurement error of the capacitance voltage transformer;
the calculating unit is used for calculating an error correction coefficient of the capacitor voltage transformer according to the measurement error of the capacitor voltage transformer;
and the correction unit is used for correcting the secondary side measured harmonic voltage according to the error correction coefficient of the capacitor voltage transformer.
The computing unit is specifically configured to:
calculating an error correction coefficient of the capacitor voltage transformer according to the following formula:
Figure BDA0001469759400000031
wherein: k represents an error correction coefficient, epsilon, of the capacitor voltage transformercvtIndicating the measurement error, U, of the capacitive voltage transformercvtAnd the harmonic voltage is measured on the secondary side of the capacitor voltage transformer.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention provides a harmonic transmission characteristic test system of a capacitor voltage transformer, which comprises an input module, a boosting module, a processing module and a correcting module, wherein the input module is used for generating a square wave signal and sending the square wave signal to the boosting module, the boosting module is used for boosting the square wave signal and sending the boosted square wave signal to the processing module, the processing module is used for outputting secondary side standard harmonic voltage and secondary side measured harmonic voltage according to the square wave signal and generating a harmonic transmission characteristic curve of the resistor-capacitor voltage transformer according to the secondary side standard harmonic voltage, and the correcting module is used for correcting the secondary side measured harmonic voltage according to the harmonic transmission characteristic curve of the resistor-capacitor voltage transformer, the harmonic voltage measured on the secondary side is corrected through the harmonic transmission characteristic curve of the resistance-capacitance voltage transformer, so that the accuracy of the harmonic voltage measured on the secondary side of the corrected capacitance voltage transformer is improved;
in the harmonic wave transfer characteristic test system of the capacitor voltage transformer, the waveform generator generates square wave signals, and compared with harmonic wave signals adopted in the prior art, the square wave signals have the advantages that the frequency components are not single, meanwhile, the square wave signals can be used for independently analyzing the transfer characteristics of each subharmonic wave, the operation is simple and convenient, and the workload is small;
in the harmonic wave transmission characteristic test system of the capacitor voltage transformer, the resistance-capacitance voltage transformer outputs secondary side standard harmonic wave voltage, a waveform analyzer generates a harmonic wave transmission characteristic curve of the resistance-capacitance voltage transformer, the harmonic wave transmission characteristic curve of the resistance-capacitance voltage transformer is used as a standard, and the harmonic wave transmission characteristic curve of the capacitor voltage transformer is compared with the harmonic wave transmission characteristic curve of the resistance-capacitance voltage transformer, so that the measurement precision is improved, the measurement result is more accurate, and the harmonic wave voltage measurement error of the capacitor voltage transformer can be reflected more truly;
in the harmonic transmission characteristic test system of the capacitor voltage transformer provided by the invention, the processing module comprises a resistance-capacitance voltage transformer, a capacitor voltage transformer and a waveform analyzer, wherein the resistance-capacitance voltage transformer and the capacitor voltage transformer respectively receive a square wave signal sent by the boosting module and respectively output a secondary side standard harmonic voltage and a secondary side measured harmonic voltage to the waveform analyzer, and the waveform analyzer respectively generates a harmonic transmission characteristic curve of the resistance-capacitance voltage transformer and a harmonic transmission characteristic curve of the capacitor voltage transformer according to the secondary side standard harmonic voltage and the secondary side measured harmonic voltage, so that the technical scheme provided by the invention not only provides the harmonic transmission characteristic curve of the standard resistance-capacitance voltage transformer through the waveform analyzer, but also provides the harmonic transmission characteristic curve of the capacitor voltage transformer, the measurement error of the capacitor voltage transformer is obtained through the harmonic transmission characteristic curve of the capacitance voltage transformer, the error correction coefficient of the capacitor voltage transformer is calculated according to the measurement error of the capacitor voltage transformer, and then the harmonic voltage measured on the secondary side is corrected through the error correction coefficient of the capacitor voltage transformer, so that the problem of harmonic measurement distortion of the capacitor voltage transformer in the prior art is solved.
Drawings
Fig. 1 is a structural diagram of a harmonic transfer characteristic testing system of a capacitor voltage transformer in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a capacitive voltage transformer harmonic transfer characteristic test system, which has a specific structure as shown in fig. 1, and comprises an input module, a boosting module, a processing module and a correcting module, wherein the functions of the modules are introduced as follows:
the input module is used for generating a square wave signal and sending the square wave signal to the boosting module;
the boost module is used for boosting the square wave signal and sending the boosted square wave signal to the processing module;
the processing module is used for outputting secondary side standard harmonic voltage and secondary side measured harmonic voltage according to the square wave signal and generating a harmonic transmission characteristic curve of the resistance-capacitance voltage transformer according to the secondary side standard harmonic voltage;
the correction module is used for correcting the secondary side measured harmonic voltage according to the harmonic transfer characteristic curve of the resistance-capacitance voltage transformer.
The input module comprises a waveform generator, the waveform generator generates square wave signals and sends the square wave signals to the boosting module, and compared with harmonic signals adopted in the prior art, the square wave signals generated by the waveform generator have the advantages that the frequency components of the square wave signals are not single, meanwhile, the square wave signals can be used for independently analyzing the transmission characteristics of each subharmonic, the operation is simple and convenient, and the workload is small.
The boosting module comprises a boosting transformer (the capacity is not lower than 1000kVA), the boosting transformer receives the square wave signal sent by the input module, boosts the square wave signal to the test set voltage, and sends the square wave signal boosted to the test set voltage to the processing module.
The processing module comprises a resistance-capacitance voltage transformer, a capacitance voltage transformer and a waveform analyzer, which are respectively introduced as follows:
the resistance-capacitance voltage transformer receives the square wave signal sent by the boosting module and outputs the secondary side standard harmonic voltage to the waveform analyzer.
The capacitor voltage transformer receives a square wave signal sent by the boosting module and outputs secondary side measured harmonic voltage to the waveform analyzer.
The waveform analyzer receives the secondary side standard harmonic voltage and the secondary side measured harmonic voltage, and respectively generates a harmonic transfer characteristic curve of the resistance-capacitance voltage transformer and a harmonic transfer characteristic curve of the capacitance voltage transformer according to the secondary side standard harmonic voltage and the secondary side measured harmonic voltage.
The correction module comprises a comparison unit, a calculation unit and a correction unit, and specifically comprises the following components:
the comparison unit is used for comparing a harmonic transfer characteristic curve of the resistance-capacitance voltage transformer with a harmonic transfer characteristic curve of the capacitance voltage transformer to obtain a measurement error of the capacitance voltage transformer;
the calculating unit is used for calculating an error correction coefficient of the capacitor voltage transformer according to the measurement error of the capacitor voltage transformer;
the correction unit is used for correcting the secondary side measured harmonic voltage according to the error correction coefficient of the capacitor voltage transformer.
The calculating unit calculates the error correction coefficient of the capacitor voltage transformer according to the following formula:
Figure BDA0001469759400000051
wherein: k represents an error correction coefficient, epsilon, of the capacitor voltage transformercvtIndicating the measurement error, U, of the capacitive voltage transformercvtAnd the harmonic voltage is measured on the secondary side of the capacitor voltage transformer.
The technical scheme provided by the embodiment of the invention not only provides a harmonic transmission characteristic curve of a standard resistance-capacitance voltage transformer through a waveform analyzer, but also provides a harmonic transmission characteristic curve of the capacitance voltage transformer, obtains the measurement error of the capacitance voltage transformer through the harmonic transmission characteristic curve of the resistance-capacitance voltage transformer, calculates the error correction coefficient of the capacitance voltage transformer according to the measurement error of the capacitance voltage transformer, and corrects the secondary side measured harmonic voltage through the error correction coefficient of the capacitance voltage transformer, thereby overcoming the harmonic measurement distortion problem of the capacitance voltage transformer in the prior art.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.

Claims (1)

1. The utility model provides a capacitive voltage transformer harmonic transfer characteristic test system which characterized in that includes:
the input module is used for generating a square wave signal and sending the square wave signal to the boosting module;
the voltage boosting module is used for boosting the square wave signals and sending the boosted square wave signals to the processing module;
the processing module is used for outputting the secondary side standard harmonic voltage and the secondary side measured harmonic voltage according to the square wave signal and generating a harmonic transmission characteristic curve of the resistance-capacitance voltage transformer according to the secondary side standard harmonic voltage;
the correction module is used for correcting the secondary side measured harmonic voltage according to the harmonic transmission characteristic curve of the resistance-capacitance voltage transformer;
the input module comprises a waveform generator, and the waveform generator generates a square wave signal and sends the square wave signal to the boosting module;
the boosting module comprises a boosting transformer, the boosting transformer receives the square wave signal sent by the input module, boosts the square wave signal to a test set voltage, and sends the square wave signal boosted to the test set voltage to the processing module;
the capacity of the booster transformer is not lower than 1000 kVA;
the processing module comprises a resistance-capacitance voltage transformer, a capacitance voltage transformer and a waveform analyzer;
the resistance-capacitance voltage transformer receives the square wave signal sent by the boosting module and outputs the standard harmonic voltage of the secondary side to the waveform analyzer;
the capacitance type voltage transformer receives the square wave signal sent by the boosting module and outputs the secondary side measured harmonic voltage to the waveform analyzer;
the waveform analyzer receives the secondary side standard harmonic voltage and the secondary side measured harmonic voltage, and respectively generates a harmonic transmission characteristic curve of the resistance-capacitance voltage transformer and a harmonic transmission characteristic curve of the capacitance voltage transformer according to the secondary side standard harmonic voltage and the secondary side measured harmonic voltage;
the correction module comprises:
the comparison unit is used for comparing the harmonic transfer characteristic curve of the resistance-capacitance voltage transformer with the harmonic transfer characteristic curve of the capacitance voltage transformer to obtain the measurement error of the capacitance voltage transformer;
the calculating unit is used for calculating an error correction coefficient of the capacitor voltage transformer according to the measurement error of the capacitor voltage transformer;
the correction unit is used for correcting the secondary side measured harmonic voltage according to the error correction coefficient of the capacitor voltage transformer;
the computing unit is specifically configured to:
calculating an error correction coefficient of the capacitor voltage transformer according to the following formula:
Figure FDA0003096538530000011
wherein: k represents an error correction coefficient, epsilon, of the capacitor voltage transformercvtIndicating the measurement error, U, of the capacitive voltage transformercvtAnd the harmonic voltage is measured on the secondary side of the capacitor voltage transformer.
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CN109406877B (en) * 2018-09-28 2021-07-06 国网江苏省电力有限公司常州供电分公司 Method and device for measuring harmonic transmission coefficient of capacitor voltage transformer
CN109521387B (en) * 2018-12-07 2021-11-02 国网江苏省电力有限公司常州供电分公司 Method and system for obtaining harmonic wave transfer characteristics of capacitor voltage transformer
CN110824405B (en) * 2019-10-30 2022-03-18 国网新疆电力有限公司哈密供电公司 System and method for detecting amplitude-frequency characteristics of capacitor voltage transformer
CN110927650A (en) * 2019-12-03 2020-03-27 国网江苏省电力有限公司常州供电分公司 Harmonic voltage measuring device and method for capacitor voltage transformer
CN111257813B (en) * 2020-03-02 2022-07-08 国网江苏省电力有限公司电力科学研究院 Non-contact voltage measurement system field calibration method and calibration device thereof
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