CN106054102B - A kind of current transformer harmonic error measuring system - Google Patents

A kind of current transformer harmonic error measuring system Download PDF

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Publication number
CN106054102B
CN106054102B CN201610657433.3A CN201610657433A CN106054102B CN 106054102 B CN106054102 B CN 106054102B CN 201610657433 A CN201610657433 A CN 201610657433A CN 106054102 B CN106054102 B CN 106054102B
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China
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harmonic
current
wave
signal
current transformer
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CN201610657433.3A
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Chinese (zh)
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CN106054102A (en
Inventor
许灵洁
陈骁
张卫华
韩霄汉
吕几凡
郭鹏
周永佳
李航康
周琦
方良飞
朱重冶
Original Assignee
国网浙江省电力公司电力科学研究院
国家电网公司
宁波三维电测设备有限公司
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Priority to CN201610657433.3A priority Critical patent/CN106054102B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/02Testing or calibrating of apparatus covered by the preceding groups of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

Abstract

The invention discloses a kind of current transformer harmonic error measuring system, which includes the harmonic wave high-current generation device for generating harmonic wave high current;For measuring to harmonic wave high current, the standard current transformer of standard signal is obtained;For measuring to harmonic wave high current, the tested current transformer of measured signal is obtained;For standard signal and measured signal to be converted into signal to be processed and send the harmonic current measurement device of supreme position machine;For according to signal to be processed obtain fundamental wave until n times harmonic wave content, than difference and angular difference host computer.It can be seen that, current transformer harmonic error measuring system provided by the invention can know error of current transformer when to harmonic measure, and then influence of the harmonic wave to error (ratio difference, angular difference) between measured signal export of tested current transformer and the standard signal of standard current transformer output is obtained, facilitate subsequent improve to tested current transformer and the accurate measurement to harmonic wave.

Description

A kind of current transformer harmonic error measuring system

Technical field

The present invention relates to current transformer error field of measuring technique, more particularly to a kind of current transformer harmonic error Measuring system.

Background technique

As nonlinear load increases in power grid, harmonic pollution is got worse, especially using electric traction system as generation In the power supply system of table, generated harmonic wave is used due to electric locomotive on a large scale, results in the evil of system side power quality Change, compromise the safety of system stable operation, the above problem causes concern of the power industry to power quality problem, realization pair The accurate measurement and the accurately metering of harmonic power of harmonic wave are significant.Harmonic distortion is paid attention in correlative study in the prior art The improvement of the accuracy and metering method of the metering of lower electric energy meter, and often have ignored harmonic wave in electric energy metering device with electric energy meter It is influenced brought by the current transformer being used cooperatively, in addition, can not also know that harmonic wave misses current transformer in the prior art Poor bring influences.

Therefore, how to provide a kind of current transformer harmonic error measuring system of solution above-mentioned technical problem is this field The current technical issues that need to address of technical staff.

Summary of the invention

The object of the present invention is to provide a kind of current transformer harmonic error measuring system, which can know that electric current is mutual Error of sensor when to harmonic measure, and then obtain the measured signal and normalized current that harmonic wave exports tested current transformer The influence of error (ratio difference, angular difference) between the standard signal of mutual inductor output facilitates subsequent to the progress of tested current transformer Improvement and the accurate measurement to harmonic wave.

In order to solve the above technical problems, the present invention provides a kind of current transformer harmonic error measuring systems, comprising:

For receiving and being input to according to user the parameter of fundamental wave, 3 subharmonic, 5 subharmonic up to n times harmonic wave of host computer Generate the harmonic wave high-current generation device of harmonic wave high current, wherein the parameter includes the fundamental wave until n times harmonic wave contains Amount, amplitude, phase and frequency, N are the odd number not less than 3;

It is connect with the harmonic wave high-current generation device, for being measured to the harmonic wave high current, obtains standard letter Number standard current transformer;

It is connect with the harmonic wave high-current generation device, for being measured to the harmonic wave high current, obtains tested letter Number tested current transformer;

Connect respectively with the standard current transformer and the tested current transformer, for by the standard signal and The measured signal is converted into signal to be processed and is sent to the harmonic current measurement device of the host computer;

It is connect respectively with the harmonic wave high-current generation device and the harmonic current measurement device, for according to described in Signal to be processed obtains the fundamental wave until the content of n times harmonic wave, than difference and angular difference, and then obtain the tested current transformer Measure the host computer of error of fundamental wave when n times harmonic wave.

Preferably, N is the odd number greater than 9, and the harmonic wave high-current generation device includes:

It is connect with the host computer, for receiving fundamental wave, 3 subharmonic, 5 subharmonic of the host computer according to user's input Until the parameter of n times harmonic wave, which respectively corresponds, generates fundamental wave generation instruction until 7 subharmonic generate instruction and 9-N combined harmonic Generate the first FPGA of instruction;

Input terminal is connect, for generating the fundamental wave function that instruction generates fundamental signal according to the fundamental wave with the first FPGA Rate source;

Input terminal is connect, for generating 3 times of instruction 3 rd harmonic signals of generation according to 3 subharmonic with the first FPGA Harmonic power source;

Input terminal is connect, for generating 5 times of instruction 5 rd harmonic signals of generation according to 5 subharmonic with the first FPGA Harmonic power source;

Input terminal connect with the first FPGA, generates 7 rd harmonic signals for generating instruction according to 7 subharmonic 7 subharmonic power sources;

Input terminal connect with the first FPGA, generates 9-N times again for generating instruction according to the 9-N combined harmonic Close the combined harmonic power source of harmonic signal;

Respectively with the output end in the fundamental power source, the output end of 3 subharmonic power sources, 5 subharmonic power sources it is defeated The output end connection of outlet, the output end of 7 subharmonic power sources and combined harmonic power source is used for the fundamental signal, 3 The up-flow that rd harmonic signal, 5 rd harmonic signals, 7 rd harmonic signals and 9-N combined harmonic signal are coupled and amplified Device.

Preferably, 19 N.

Preferably, the current transformer that the standard current transformer is 0.05S grades.

Preferably, the standard current transformer is high-accuracy current divider.

Preferably, the current transformer that the tested current transformer is 0.2 grade.

Preferably, the tested current transformer is electronic current mutual inductor.

Preferably, the harmonic current measurement device includes:

Sequentially connected relay module, AD sampling module, the 2nd FPGA, stm32 and interchanger, wherein it is described after Electrical appliance module includes sampling resistor, and the AD sampling module includes ADC sampling A/D chip, and the interchanger and the host computer connect It connects;

The harmonic current measurement device further include:

With the 2nd FPGA synchronization module connecting and FT3 module;

The first power grid mouth, the second power grid mouth, the first smooth network interface and the second smooth network interface being connect with the interchanger;

The third light network interface being connect by the 3rd FPGA with the interchanger.

The present invention provides a kind of current transformer harmonic error measuring system, which includes for generating the big electricity of harmonic wave The harmonic wave high-current generation device of stream;For measuring to harmonic wave high current, the standard current transformer of standard signal is obtained; For measuring to harmonic wave high current, the tested current transformer of measured signal is obtained;For standard signal to be believed with tested It number is converted into signal to be processed and sends the harmonic current measurement device of supreme position machine;For obtaining fundamental wave according to signal to be processed Until the content of n times harmonic wave, than difference and angular difference, and then obtain tested current transformer measurement fundamental wave until mistake when n times harmonic wave The host computer of difference.As it can be seen that the application simulates electric system ring by generating the harmonic wave high-current generation device of harmonic wave high current Border, then measure according to the tested current transformer and standard current transformer measured respectively to harmonic wave high current tested Signal and standard signal obtain fundamental wave and n times harmonic wave content, than difference and angular difference, by and standard current transformer ratio Compared with can know error of current transformer when to harmonic measure, and then obtain what harmonic wave exported tested current transformer The influence of error (ratio difference, angular difference) between measured signal and the standard signal of standard current transformer output, it is subsequent right to facilitate Tested current transformer improves and the accurate measurement to harmonic wave.

Detailed description of the invention

It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.

Fig. 1 is a kind of structural schematic diagram of current transformer harmonic error measuring system provided by the invention;

Fig. 2 is the structural schematic diagram of another current transformer harmonic error measuring system provided by the invention;

Fig. 3 is the structural schematic diagram of another current transformer harmonic error measuring system provided by the invention;

Fig. 4 is a kind of schematic diagram of harmonic current measurement device provided by the invention.

Specific embodiment

Core of the invention is to provide a kind of current transformer harmonic error measuring system, which can know that electric current is mutual Error of sensor when to harmonic measure, and then obtain the measured signal and normalized current that harmonic wave exports tested current transformer The influence of error (ratio difference, angular difference) between the standard signal of mutual inductor output facilitates subsequent to the progress of tested current transformer Improvement and the accurate measurement to harmonic wave.

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.

Fig. 1 is please referred to, Fig. 1 is a kind of structural representation of current transformer harmonic error measuring system provided by the invention Figure, the test macro include:

For receiving and being input to according to user the ginseng of fundamental wave, 3 subharmonic, 5 subharmonic up to n times harmonic wave of host computer 5 Number generates the harmonic wave high-current generation devices 1 of harmonic wave high currents, wherein parameter include fundamental wave until n times harmonic wave content, width Value, phase and frequency, N are the odd number not less than 3;

Specifically, fundamental frequency here can be 50Hz, then the frequency of n times harmonic wave is N*50Hz.Certainly, base here Wave frequency rate can also be other numerical value, and the present invention is not particularly limited herein.

Preferably, N is the odd number greater than 9, and harmonic wave high-current generation device 1 includes:

It is connect with host computer 5, for receiving fundamental wave, 3 subharmonic, 5 subharmonic that host computer 5 inputs according to user until N The parameter of subharmonic, which respectively corresponds, generates fundamental wave generation instruction until 7 subharmonic generate instruction and 9-N combined harmonic generation First FPGA of instruction;

Input terminal is connect, for generating the fundamental power source that instruction generates fundamental signal according to fundamental wave with the first FPGA;

Input terminal is connect, for generating 3 subharmonic that instruction generates 3 rd harmonic signals according to 3 subharmonic with the first FPGA Power source;

Input terminal is connect, for generating 5 subharmonic that instruction generates 5 rd harmonic signals according to 5 subharmonic with the first FPGA Power source;

Input terminal is connect, for generating 7 subharmonic that instruction generates 7 rd harmonic signals according to 7 subharmonic with the first FPGA Power source;

Input terminal connect with the first FPGA, generates 9-N combined harmonic letter for generating instruction according to 9-N combined harmonic Number combined harmonic power source;

Respectively with the output end in fundamental power source, the output end of 3 subharmonic power sources, 5 subharmonic power sources output end, The output end connection of the output end and combined harmonic power source of 7 subharmonic power sources is used to believe fundamental signal, 3 subharmonic Number, 5 rd harmonic signals, 7 rd harmonic signals and 9-N combined harmonic the signal current lifting device that is coupled and amplified.

It is understood that harmonic wave high-current generation device 1 provided by the invention is by each harmonic power source and current lifting device It being composed, wherein fundamental wave, 3 subharmonic, 5 subharmonic and 7 subharmonic are independently exported by respective harmonic wave electron source, and 9-N times Combined harmonic synthesizes output by combined harmonic generator after linear power amplifier, and each harmonic is put by current lifting device coupling Combined harmonic high current is exported after big, the content for meeting the fundamental wave and each harmonic in harmonic wave high current can be fed back by measurement After automatically adjust.

In addition, it is necessary to illustrate, fundamental wave, 3 subharmonic, 5 subharmonic and 7 subharmonic are individually exported in the application, And the compound output of 9-N subharmonic is because fundamental wave, 3 subharmonic, the occupancy volume of 5 subharmonic and 7 subharmonic are very big, can account for About the 90% of combined harmonic high current, and the content of the harmonic wave after 9 times is just considerably less, therefore, 9-N subharmonic is compound defeated Out.

It is understood that fundamental wave, 3 subharmonic, the formula of 5 subharmonic and 7 subharmonic are as follows:

In formula (1): xm(t) be m rd harmonic signal, m is overtone order, and when m=1 is fundamental wave, m can take 1,3,5 and 7;AmFor fundamental wave or harmonic amplitude;For fundamental wave or harmonic wave initial phase;ω0=2 π/T0,T0For the signal primitive period.

X in formula (2)9It (t) is 9-N combined harmonic signal, n is 9≤n≤N odd number.For fundamental wave or harmonic wave initial phase Position;ω0=2 π/T0,T0For the signal primitive period.

As it can be seen that harmonic wave high-current generation device 1 provided herein has the following characteristics that

1) with the fundamental wave synchronous independent harmonic wave electron source controllable with phase;

2) with the fundamental wave synchronous combined harmonic generator controllable with phase;

3) there is the current lifting device that can be coupled to multichannel.

The working principle of the harmonic wave high-current generation device 1 are as follows:

1) first on 5 interface of host computer established standards channel fundamental wave until n times harmonic wave parameter;

2) host computer 5 will be sent out according to fundamental wave up to the corresponding harmonic generation instruction of the parameter generation of n times harmonic wave passes through UDP It send to the first FPGA;

3) fundamental power source is until n times harmonic power source generates instruction and harmonic generation instruction life according to corresponding fundamental wave At corresponding fundamental wave and harmonic wave;

4) current lifting device is compound humorous to fundamental signal, 3 rd harmonic signals, 5 rd harmonic signals, 7 rd harmonic signals and 9-N times Wave signal is coupled and is amplified.

It is connect with harmonic wave high-current generation device 1, for being measured to harmonic wave high current, obtains the standard of standard signal Current transformer 2;

Specifically, harmonic wave high current signal obtains standard secondary current signal by standard current transformer 2, the standard two Primary current signal is as standard signal.

It is connect with harmonic wave high-current generation device 1, for being measured to harmonic wave high current, obtains the tested of measured signal Current transformer 3;

Specifically, harmonic wave high current signal obtains tested secondary current signal by tested current transformer 3, this tested two Primary current signal is as measured signal.

Preferably, 19 N.

Preferably, the current transformer that standard current transformer 2 is 0.05S grades.

Preferably, standard current transformer 2 is high-accuracy current divider.

Specifically, high-accuracy current divider here be precision resister, test when, using the voltage at current divider both ends as Standard signal.

Preferably, it is tested the current transformer that current transformer 3 is 0.2 grade.

Preferably, being tested current transformer 3 is electronic current mutual inductor.

It is understood that 0.05S grades of current transformer can be selected for standard current transformer 2, for high-precision Current transformer for, since its acquisition precision is very high, it is believed that its acquire fundamental wave and harmonic wave it is very accurate, therefore It can be as the standard of tested current transformer 3, in addition, high-accuracy current divider should be used when test frequency is higher than 400Hz. Tested current transformer 3 can select different types of current transformer as needed, and it can be common for being tested current transformer 3 0.2 grade or 0.5 grade of conventional current mutual inductor can also be electronic current mutual inductor, it is to be understood that conventional current mutual inductance The output rated secondary current of device can be 5A or 1A, the exportable simulation small voltage of electronic current mutual inductor also exportable number It measures (IEC61850 or FT3).

Specifically, referring to figure 2. and Fig. 3, wherein Fig. 2 and Fig. 3 is that another current transformer provided by the invention is humorous The structural schematic diagram of wave error measuring system.

In Fig. 2 and Fig. 3, CT0 indicate be standard current transformer, be conventional current mutual inductor, CTx indicate be by Survey current transformer.MU is the combining unit connecting with electronic current mutual inductor.In conclusion harmonic wave electricity provided by the invention Stream error measuring device can take into account conventional current mutual inductor and electronic current mutual inductor, possess complete test and a variety of Miscellaneous function.0.1 grade, 0.02 grade of fundamental wave error precision is reached to stress_responsive genes precision.For the electronics for thering is combining unit to export Formula current transformer, harmonic current error measuring means support synchronous and asynchronous measurement mode, and synchronization signal can be defeated Enter or the pulse per second (PPS) exported and IRIG-B.

It is connect respectively with standard current transformer 2 and tested current transformer 3, for turning standard signal and measured signal It changes signal to be processed into and sends the harmonic current measurement device 4 of supreme position machine 5;

Preferably, harmonic current measurement device 4 includes:

Sequentially connected relay module, AD sampling module, the 2nd FPGA, stm32 and interchanger, wherein relay Module includes sampling resistor, and AD sampling module includes ADC sampling A/D chip, and interchanger is connect with host computer 5;

Specifically, AD sampling module here includes 24 high-precision adc sampling A/D chips.

Harmonic current measurement device 4 further include:

With the 2nd FPGA synchronization module connecting and FT3 module;

The first power grid mouth, the second power grid mouth, the first smooth network interface and the second smooth network interface being connect with interchanger;

The third light network interface being connect by the 3rd FPGA with interchanger.

Specifically, referring to figure 4., Fig. 4 is a kind of schematic diagram of harmonic current measurement device provided by the invention.

Wherein, standard channel data processing:

When standard channel connects the port 2 analog quantity of standard current transformer (5A/1A), 5A range and 1A are selected in host computer 5 Range, host computer 5 are sent to stm32 by udp protocol and are instructed, and stm32 is switched to specified according to instruction control relay module Range access, the high current of input change into voltage signal by sampling resistor and are sent to AD sampling module;AD sampling module is right first Voltage signal is sent to ADC sampling A/D chip and (is specifically as follows by the processing such as channel selecting, programming amplifying, differential attenuation AD127X analog-to-digital conversion chip);2nd FPGA controls ADC sampling A/D chip according to synchronization signal and analog sampling value is converted to number It measures and is stored by SPI protocol data of reading back;Stm32 will be stored in the data in the 2nd FPGA using the agreement of FSMC bus It reads out and the form for being packaged into UDP message is sent to host computer 5, calculation process is carried out to standard harmonic amount data by host computer 5;

When standard channel connects simulation small voltage port, the small voltage of input is directly sent to AD sampling module;AD sampling module ADC sampling A/D chip is sent to after the processing such as channel selecting, programming amplifying, differential attenuation to voltage signal;2nd FPGA according to Synchronization signal controls ADC sampling A/D chip and analog sampling value is converted to digital quantity and is stored by SPI protocol data of reading back; Stm32 is sent in the form of the agreement of FSMC bus reads out the data being stored in the 2nd FPGA and is packaged into UDP message To host computer 5, calculation process is carried out to standard harmonic amount data by host computer 5;

Tested channel data processing:

When tested channel connects the port high current (5A/1A), 5A range and 1A range, host computer 5 is selected to pass through in host computer 5 Udp protocol sends to stm32 and instructs, and stm32 is switched to specified range access according to instruction control relay module, input it is big Electric current changes into voltage signal by sampling resistor and is sent to AD sampling module;AD sampling module to voltage signal by channel selecting, ADC sampling A/D chip is sent to after the processing such as programming amplifying, differential attenuation;2nd PFGA controls ADC sampling A/D chip according to synchronization signal Analog sampling value is converted to digital quantity and is stored by SPI protocol data of reading back;Stm32 uses the agreement of FSMC bus will The data being stored in the 2nd PFGA, which read out and are packaged into the form of UDP message, is sent to host computer 5, by host computer 5 to tested Harmonic content data carry out calculation process;

When tested channel connects simulation small voltage port, the small voltage of input is directly sent to AD sampling module;AD sampling module ADC sampling A/D chip is sent to after the processing such as channel selecting, programming amplifying, differential attenuation to voltage signal;2nd PFGA according to Synchronization signal controls ADC sampling A/D chip and analog sampling value is converted to digital quantity and is stored by SPI protocol data of reading back; Stm32 is sent in the form of the agreement of FSMC bus reads out the data being stored in the 2nd PFGA and is packaged into UDP message To host computer 5, calculation process is carried out to tested harmonic content data by host computer 5;

Be measured as digital quantity, using IEC61850 agreement, have synchronization signal when, optical fiber is according to tail optical fiber type (ST/SC) Connecing the twisted pair on the first smooth network interface perhaps the second smooth network interface can connect in any one power grid mouth (the first power grid mouth or second Power grid mouth) on, IEC61850 message is directly sent to host computer 5 by interchanger, and by 5 analytic message of host computer, taking-up is tested humorous Wave amount data, and carry out calculation process;Be measured as digital quantity, using IEC61850 agreement, without synchronization signal when, optical fiber is connect (SC mouthfuls are only supported) on third light network interface;IEC61850 message is sent at the 3rd PFGA, by the 3rd PFGA analytic message and Inside passes through network interface plus temporal information again and is sent to host computer 5 by interchanger, and host computer 5 is according to the tested harmonic content in message Data and temporal information carry out calculation process;

When being measured as digital quantity using FT3 agreement, the port FT3 is selected, signal send FT3 signal after photoelectric conversion Onto the 2nd PFGA, the data that inside includes are taken out and are stored by parsing FT3 message by the 2nd PFGA, are adopted by stm32 After reading by data with FSMC bus protocol, the form that UDP message is packaged into stm32 is sent to host computer 5, and host computer 5 will Tested harmonic content data in UDP message parse carry out calculation process.

It is connect respectively with harmonic wave high-current generation device 1 and harmonic current measurement device 4, for according to signal to be processed Obtain fundamental wave until n times harmonic wave content, than difference and angular difference error host computer 5.

It is understood that host computer 5 carries out Fourier transformation to the signal to be processed that harmonic current measurement device 4 transmits Operation can calculate the content of fundamental wave and each harmonic, than difference and angular difference.

The formula of Fourier transformation is as follows:

Fourier coefficient:

In formula: T is the period;ω0For fundamental frequency, ω0=2 π/T0,T0For the signal primitive period.

Another form of trigonometric function expansion:

In formula: a0For the DC component of signal, AnFor n times harmonic amplitude, n ω is n times harmonic frequency,For n times harmonic wave Phase angle,For n times harmonic wave.

The ratio declinate of fundamental wave and each harmonic is poor:

In formula: KnPoor, the δ for nth harmonic rationFor nth harmonic angular difference.

As it can be seen that influence of the nth harmonic to current transformer can be obtained according to the content of nth harmonic, than difference and angular difference, I.e. current transformer acquisition nth harmonic when error.

In addition, host computer 5 meets a variety of test requests, rich interface can carry out fundamental wave and harmonic wave to various electron sources The control of content, and slope is carried out according to setting is automatic, while receiving the various electricity and error of the sending of stress_responsive genes instrument Data-signal forms test record inside local data base, facilitates subsequent analysis and inquiry.

To sum up, the harmonic wave high current that harmonic wave high-current generation device is generated according to harmonic wave mechanism can be known in the present invention, It can know that harmonic wave is primary to current transformer, influence of secondary current signal, and then obtain harmonic wave to tested current transformer The influence of error (ratio difference, angular difference) between the measured signal of output and the standard signal of standard current transformer output;It can Know harmonic current error measuring means to the ratio of measured signal and standard signal under the analysis of harmonic signal and each harmonic Difference, angular difference.

The present invention provides a kind of current transformer harmonic error measuring system, which includes for generating the big electricity of harmonic wave The harmonic wave high-current generation device of stream;For measuring to harmonic wave high current, the standard current transformer of standard signal is obtained; For measuring to harmonic wave high current, the tested current transformer of measured signal is obtained;For standard signal to be believed with tested It number is converted into signal to be processed and sends the harmonic current measurement device of supreme position machine;For obtaining fundamental wave according to signal to be processed Up to the content of n times harmonic wave, than the host computer of difference and angular difference.As it can be seen that harmonic wave big electricity of the application by generation harmonic wave high current Flow generating apparatus simulates power system environment, then according to the tested current transformer that harmonic wave high current is measured respectively with And the measured signal that measures of standard current transformer and standard signal obtain the content of fundamental wave and n times harmonic wave, than difference and angular difference, By that compared with standard current transformer, can know error of current transformer when to harmonic measure, and then obtain humorous Error (ratio between the standard signal that wave exports the measured signal exported of tested current transformer and standard current transformer Difference, angular difference) influence, facilitate subsequent improve to tested current transformer and the accurate measurement to harmonic wave.

It should be noted that in the present specification, relational terms such as first and second and the like are used merely to one A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that There is also other identical elements in the process, method, article or apparatus that includes the element.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest scope of cause.

Claims (4)

1. a kind of current transformer harmonic error measuring system characterized by comprising
For receiving and being input to the fundamental wave, 3 subharmonic, 5 subharmonic of host computer according to user until the parameter of n times harmonic wave generates The harmonic wave high-current generation device of harmonic wave high current, wherein the parameter include the fundamental wave until n times harmonic wave content, width Value, phase and frequency;
It is connect with the harmonic wave high-current generation device, for being measured to the harmonic wave high current, obtains standard signal Standard current transformer;
It is connect with the harmonic wave high-current generation device, for being measured to the harmonic wave high current, obtains measured signal Tested current transformer;
It is connect respectively with the standard current transformer and the tested current transformer, for by the standard signal and described Measured signal is converted into signal to be processed and is sent to the harmonic current measurement device of the host computer;
It is connect respectively with the harmonic wave high-current generation device and the harmonic current measurement device, is described wait locate for foundation Reason signal obtain the fundamental wave until n times harmonic wave content, than difference and angular difference the host computer;
N is the odd number greater than 9, and the harmonic wave high-current generation device includes:
Connect with the host computer, for receiving the host computer according to the fundamental wave, 3 subharmonic, 5 subharmonic of user's input until The parameter of n times harmonic wave, which respectively corresponds, generates fundamental wave generation instruction until 7 subharmonic generate instruction and 9-N combined harmonic generation First FPGA of instruction;
Input terminal is connect, for generating the fundamental power that instruction generates fundamental signal according to the fundamental wave with the first FPGA Source;
Input terminal is connect, for generating 3 subharmonic that instruction generates 3 rd harmonic signals according to 3 subharmonic with the first FPGA Power source;
Input terminal is connect, for generating 5 subharmonic that instruction generates 5 rd harmonic signals according to 5 subharmonic with the first FPGA Power source;
Input terminal is connect, for generating 7 times of instruction 7 rd harmonic signals of generation according to 7 subharmonic with the first FPGA Harmonic power source;
Input terminal is connect, for compound humorous according to the 9-N combined harmonic generation instruction generation 9-N times with the first FPGA The combined harmonic power source of wave signal;
Respectively with the output end in the fundamental power source, the output end of 3 subharmonic power sources, 5 subharmonic power sources output end, The connection of the output end of the output ends of 7 subharmonic power sources and combined harmonic power source, for by the fundamental signal, 3 times it is humorous The current lifting device that wave signal, 5 rd harmonic signals, 7 rd harmonic signals and 9-N combined harmonic signal are coupled and amplified;
The standard current transformer includes 0.05S grades of current transformer and high-accuracy current divider, wherein when test frequency height When 400Hz, the high-accuracy current divider is selected to measure;
The harmonic current measurement device includes:
Sequentially connected relay module, AD sampling module, the 2nd FPGA, stm32 and interchanger, wherein the relay Module includes sampling resistor, and the AD sampling module includes ADC sampling A/D chip, and the interchanger is connect with the host computer;
The harmonic current measurement device further include:
With the 2nd FPGA synchronization module connecting and FT3 module;
The first power grid mouth, the second power grid mouth, the first smooth network interface and the second smooth network interface being connect with the interchanger;
The third light network interface being connect by the 3rd FPGA with the interchanger;
Wherein, be measured as digital quantity, using IEC61850 agreement, have synchronization signal when, transmit the measured optical fiber It is connect on the first smooth network interface or the second smooth network interface according to tail optical fiber type, transmitting the measured twisted pair can connect in the first electricity Network interface or the second power grid mouth;
It is described be measured as digital quantity, using IEC61850 agreement, without synchronization signal when, the measured optical fiber will be transmitted It connects on the third light network interface;
It is described be measured as digital quantity using FT3 agreement when, select the port FT3 in the FT3 module.
2. current transformer harmonic error measuring system as described in claim 1, which is characterized in that N 19.
3. current transformer harmonic error measuring system as described in claim 1, which is characterized in that the tested Current Mutual Inductance The current transformer that device is 0.2 grade.
4. current transformer harmonic error measuring system as described in claim 1, which is characterized in that the tested Current Mutual Inductance Device is electronic current mutual inductor.
CN201610657433.3A 2016-08-11 2016-08-11 A kind of current transformer harmonic error measuring system CN106054102B (en)

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