CN106054102A - Current-transformer harmonic wave error measurement system - Google Patents

Current-transformer harmonic wave error measurement system Download PDF

Info

Publication number
CN106054102A
CN106054102A CN201610657433.3A CN201610657433A CN106054102A CN 106054102 A CN106054102 A CN 106054102A CN 201610657433 A CN201610657433 A CN 201610657433A CN 106054102 A CN106054102 A CN 106054102A
Authority
CN
China
Prior art keywords
harmonic
current
signal
harmonic wave
current transformer
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.)
Granted
Application number
CN201610657433.3A
Other languages
Chinese (zh)
Other versions
CN106054102B (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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Sunrise Instruments Co ltd
State Grid Corp of China SGCC
Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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 State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201610657433.3A priority Critical patent/CN106054102B/en
Publication of CN106054102A publication Critical patent/CN106054102A/en
Application granted granted Critical
Publication of CN106054102B publication Critical patent/CN106054102B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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

Abstract

The invention discloses a current-transformer harmonic wave error measurement system. The system comprises a harmonic wave heavy current generation device, a standard current transformer, a measured current transformer, a harmonic wave current measurement apparatus and an upper computer, wherein the harmonic wave heavy current generation device is used for generating a harmonic wave heavy current; the standard current transformer is used for measuring the harmonic wave heavy current so as to acquire a standard signal; the measured current transformer is used for measuring the harmonic wave heavy current so as to acquire a measured signal; the harmonic wave current measurement apparatus is used for converting the standard signal and the measured signal into a signal to be processed and sending to the upper computer; and the upper computer is used for acquiring a content, a ratio error and a angular difference of a fundamental wave till to N subharmonics. The current-transformer harmonic wave error measurement system provided in the invention can acquire an error caused by a current transformer during harmonic wave measurement so that an influence of an harmonic wave on an error (the ratio error and the angular difference) between the measured signal output by the measured current transformer and the standard signal output by the standard current transformer is obtained, which is convenient for subsequently improving the measured current transformer and accurately measuring the harmonic wave.

Description

A kind of current transformer harmonic error measures system
Technical field
The present invention relates to current transformer error field of measuring technique, particularly relate to a kind of current transformer harmonic error Measurement system.
Background technology
Along with the increasing of nonlinear load in electrical network, harmonic pollution is day by day serious, particularly with electric traction system as generation In the electric power system of table, harmonic wave produced by the use on a large scale of electric locomotive, result in the evil of the system side quality of power supply Changing, compromise the safety of system stable operation, the problems referred to above cause the power industry concern to power quality problem, it is achieved right Accurately measuring of harmonic wave is significant with the accurately metering of harmonic power.Correlational study of the prior art pays attention to harmonic distortion Lower electric energy meter metering accuracy and the improvement of metering method, and often have ignored harmonic wave in electric power meter with electric energy meter With the use of the impact that brought of current transformer, it addition, prior art also cannot being known, harmonic wave is to current transformer by mistake The impact that difference band comes.
Therefore, how providing a kind of current transformer harmonic error solving above-mentioned technical problem to measure system is this area Technical staff is presently required and solves the technical problem that.
Summary of the invention
It is an object of the invention to provide a kind of current transformer harmonic error and measure system, this system can know that electric current is mutual Sensor error when to harmonic measure, and then obtain measured signal and the normalized current that tested current transformer is exported by harmonic wave The impact of error (ratio difference, angular difference) between the standard signal of transformer output, facilitates and follow-up carries out tested current transformer Improve and the accurate of harmonic wave is measured.
For solving above-mentioned technical problem, the invention provides a kind of current transformer harmonic error and measure system, including:
For receiving and according to user's input to the first-harmonic of host computer, 3 subharmonic, 5 subharmonic until the parameter of n times harmonic wave Generating the harmonic wave high-current generation device of the big electric current of harmonic wave, wherein, described parameter includes described first-harmonic until the containing of n times harmonic wave Amount, amplitude, phase place and frequency, N is the odd number not less than 3;
It is connected with described harmonic wave high-current generation device, measures for electric current big to described harmonic wave, obtain standard letter Number standard current transformer;
It is connected with described harmonic wave high-current generation device, measures for electric current big to described harmonic wave, obtain tested letter Number tested current transformer;
Be connected with described standard current transformer and described tested current transformer respectively, for by described standard signal and Described measured signal is converted into pending signal and sends the harmonic current measurement device to described host computer;
It is connected with described harmonic wave high-current generation device and described harmonic current measurement device respectively, for according to described Pending signal obtains described first-harmonic until the content of n times harmonic wave, ratio and angular difference, and then obtains described tested current transformer Measure described first-harmonic until the described host computer of error during n times harmonic wave.
Preferably, N is the odd number more than 9, and described harmonic wave high-current generation device includes:
It is connected with described host computer, for receiving the first-harmonic of described host computer foundation user's input, 3 subharmonic, 5 subharmonic Until the parameter of n times harmonic wave correspondence respectively generates first-harmonic generates instruction until 7 subharmonic generate instruction and 9-N combined harmonic Generate a FPGA of instruction;
Input is connected with a described FPGA, for generating the first-harmonic merit of instruction generation fundamental signal according to described first-harmonic Rate source;
Input is connected, generates for foundation 3 subharmonic 3 times of instruction generation 3 rd harmonic signal with a described FPGA Harmonic power source;
Input is connected, generates for foundation 5 subharmonic 5 times of instruction generation 5 rd harmonic signal with a described FPGA Harmonic power source;
Input is connected with a described FPGA, for generating instruction generation 7 rd harmonic signal according to described 7 subharmonic 7 subharmonic power sources;
Input is connected with a described FPGA, for generating 9-N time again according to described 9-N combined harmonic generation instruction Close the combined harmonic power source of harmonic signal;
Respectively with the outfan in described fundamental power source, the outfan of 3 subharmonic power sources, 5 subharmonic power sources defeated Go out end, the outfan of the outfan of 7 subharmonic power sources and combined harmonic power source connects, for by described fundamental signal, 3 The up-flow that rd harmonic signal, 5 rd harmonic signal, 7 rd harmonic signal and 9-N combined harmonic signal carry out coupling and amplifying Device.
Preferably, N is 19.
Preferably, described standard current transformer is the current transformer of 0.05S level.
Preferably, described standard current transformer is high-accuracy current divider.
Preferably, described tested current transformer is the current transformer of 0.2 grade.
Preferably, described tested current transformer is electronic current mutual inductor.
Preferably, described harmonic current measurement device includes:
The relay module that is sequentially connected with, AD sampling module, the 2nd FPGA, stm32 and switch, wherein, described in continue Electrical appliance module includes that sampling resistor, described AD sampling module include ADC sampling A/D chip, and described switch is with described host computer even Connect;
Described harmonic current measurement device also includes:
The synchronization module being connected with described 2nd FPGA and FT3 module;
The first electrical network mouth, the second electrical network mouth, the first smooth network interface and the second smooth network interface being connected with described switch;
The 3rd smooth network interface being connected with described switch by the 3rd FPGA.
The invention provides a kind of current transformer harmonic error and measure system, this system includes for generating the big electricity of harmonic wave The harmonic wave high-current generation device of stream;Measure for electric current big to harmonic wave, obtain the standard current transformer of standard signal; Measure for electric current big to harmonic wave, obtain the tested current transformer of measured signal;For by standard signal and tested letter Number it is converted into pending signal and sends the harmonic current measurement device to host computer;For obtaining first-harmonic according to pending signal Until the content of n times harmonic wave, ratio and angular difference, and then obtain tested current transformer and measure first-harmonic until mistake during n times harmonic wave The host computer of difference.Visible, the application simulates power system ring by generating the harmonic wave high-current generation device of the big electric current of harmonic wave Border, then according to the tested current transformer that electric current big to harmonic wave measures respectively and standard current transformer record tested Signal and standard signal obtain first-harmonic and the content of n times harmonic wave, ratio and angular difference, by the ratio with standard current transformer Relatively, just would know that current transformer error when to harmonic measure, and then obtain what tested current transformer was exported by harmonic wave The impact of error (ratio difference, angular difference) between the standard signal of measured signal and standard current transformer output, it is follow-up right to facilitate Tested current transformer improves and measures the accurate of harmonic wave.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in prior art and embodiment The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only some enforcements of the present invention Example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtains according to these accompanying drawings Obtain other accompanying drawing.
Fig. 1 measures the structural representation of system for a kind of current transformer harmonic error that the present invention provides;
Fig. 2 measures the structural representation of system for the another kind of current transformer harmonic error that the present invention provides;
Fig. 3 measures the structural representation of system for the another kind of current transformer harmonic error that the present invention provides;
The schematic diagram of a kind of harmonic current measurement device that Fig. 4 provides for the present invention.
Detailed description of the invention
The core of the present invention is to provide a kind of current transformer harmonic error and measures system, and this system can know that electric current is mutual Sensor error when to harmonic measure, and then obtain measured signal and the normalized current that tested current transformer is exported by harmonic wave The impact of error (ratio difference, angular difference) between the standard signal of transformer output, facilitates and follow-up carries out tested current transformer Improve and the accurate of harmonic wave is measured.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Refer to Fig. 1, Fig. 1 and measure the structural representation of system for a kind of current transformer harmonic error that the present invention provides Figure, this test system includes:
For receiving and according to user's input to the first-harmonic of host computer 5,3 subharmonic, 5 subharmonic until the ginseng of n times harmonic wave Number generates the harmonic wave high-current generation devices 1 of the big electric currents of harmonic wave, and wherein, parameter includes first-harmonic until the content of n times harmonic wave, width Value, phase place and frequency, N is 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 can also be other numerical value, and the present invention is not particularly limited at this.
As preferably, N is the odd number more than 9, and harmonic wave high-current generation device 1 includes:
It is connected with host computer 5, for receiving first-harmonic that host computer 5 inputs, 3 subharmonic, 5 subharmonic according to user until N The parameter of subharmonic correspondence respectively generates first-harmonic and generates instruction until 7 subharmonic generate instruction and 9-N combined harmonic generates Oneth FPGA of instruction;
Input and a FPGA connect, for generating the fundamental power source of fundamental signal according to first-harmonic generation instruction;
Input and a FPGA connect, for generating 3 subharmonic of 3 rd harmonic signal according to 3 subharmonic generation instructions Power source;
Input and a FPGA connect, for generating 5 subharmonic of 5 rd harmonic signal according to 5 subharmonic generation instructions Power source;
Input and a FPGA connect, for generating 7 subharmonic of 7 rd harmonic signal according to 7 subharmonic generation instructions Power source;
Input and a FPGA connect, for generating 9-N combined harmonic letter according to 9-N combined harmonic generation instruction Number combined harmonic power source;
Respectively with the outfan in fundamental power source, the outfan of 3 subharmonic power sources, the outfan of 5 subharmonic power sources, The outfan of 7 subharmonic power sources and the outfan of combined harmonic power source connect, for by fundamental signal, 3 subharmonic letters Number, 5 rd harmonic signal, 7 rd harmonic signal and 9-N the combined harmonic signal current lifting device that carries out coupling and amplifying.
It is understood that the harmonic wave high-current generation device 1 that the present invention provides is by each harmonic power source and current lifting device Combining, wherein, first-harmonic, 3 subharmonic, 5 subharmonic and 7 subharmonic are independently exported by respective harmonic wave electron source, 9-N time Combined harmonic is synthesized output by combined harmonic generator after linear power amplifier, and each harmonic is put by current lifting device coupling The output big electric current of combined harmonic after big, the content meeting the first-harmonic in the big electric current of harmonic wave and each harmonic can be fed back by measurement After be automatically adjusted.
In addition, it is necessary to explanation, first-harmonic, 3 subharmonic, 5 subharmonic and 7 subharmonic are individually exported by the application, And 9-N subharmonic is combined output and is because the occupancy volume of first-harmonic, 3 subharmonic, 5 subharmonic and 7 subharmonic very greatly, can account for About the 90% of the big electric current of combined harmonic, and the content of the harmonic wave after 9 times is the most considerably less, therefore, 9-N subharmonic is combined defeated Go out.
It is understood that the formula of first-harmonic, 3 subharmonic, 5 subharmonic and 7 subharmonic is as follows:
In formula (1): xmT () is m rd harmonic signal, m is overtone order, is first-harmonic during m=1, m can take 1,3,5 and 7;AmFor first-harmonic or harmonic amplitude;For first-harmonic or harmonic wave initial phase;ω0=2 π/T0,T0For the signal primitive period.
X in formula (2)9T () is 9-N combined harmonic signal, n is the odd number of 9≤n≤N.For first-harmonic or harmonic wave initial phase Position;ω0=2 π/T0,T0For the signal primitive period.
Visible, harmonic wave high-current generation device 1 provided herein has the following characteristics that
1) there is the independent harmonic wave electron source Tong Bu with first-harmonic that phase place is controlled;
2) there is the combined harmonic generator Tong Bu with first-harmonic that phase place is controlled;
3) having can be to the current lifting device of multichannel coupling.
The operation principle of this harmonic wave high-current generation device 1 is:
1) first on host computer 5 interface the first-harmonic of established standards passage until the parameter of n times harmonic wave;
2) host computer 5 by according to first-harmonic until n times harmonic wave parameter generate corresponding harmonic generation instruction sent out by UDP Deliver to a FPGA;
3) fundamental power source is until n times harmonic power source generates instruction according to corresponding first-harmonic and harmonic generation instruction is raw Become corresponding first-harmonic and harmonic wave;
4) current lifting device is compound humorous to fundamental signal, 3 rd harmonic signal, 5 rd harmonic signal, 7 rd harmonic signal and 9-N time Ripple signal couples and amplifies.
It is connected with harmonic wave high-current generation device 1, measures for electric current big to harmonic wave, obtain the standard of standard signal Current transformer 2;
Specifically, the big current signal of harmonic wave obtains standard secondary current signal by standard current transformer 2, this standard two Primary current signal is as standard signal.
It is connected with harmonic wave high-current generation device 1, measures for electric current big to harmonic wave, obtain the tested of measured signal Current transformer 3;
Specifically, the big current signal of harmonic wave obtains tested secondary current signal by tested current transformer 3, and these are tested two years old Primary current signal is as measured signal.
As preferably, N is 19.
As preferably, standard current transformer 2 is the current transformer of 0.05S level.
As preferably, standard current transformer 2 is high-accuracy current divider.
Specifically, high-accuracy current divider here is precision resister, test time, using the voltage at diverter two ends as Standard signal.
As preferably, tested current transformer 3 is the current transformer of 0.2 grade.
As preferably, tested current transformer 3 is electronic current mutual inductor.
It is understood that for standard current transformer 2, can be selected for the current transformer of 0.05S level, for high accuracy Current transformer for, owing to its acquisition precision is the highest, it is believed that its first-harmonic gathered and harmonic wave are very accurate, therefore Can be as the standard of tested current transformer 3, it addition, high-accuracy current divider should be used when testing frequency higher than 400Hz. Tested current transformer 3 can select different types of current transformer, tested current transformer 3 can be common as required 0.2 grade or 0.5 grade of conventional current transformer, it is possible to for 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 electronic current mutual inductor exportable simulation the most exportable numeral of small voltage Amount (IEC61850 or FT3).
Specifically, refer to Fig. 2 and Fig. 3, wherein, the another kind of current transformer that Fig. 2 and Fig. 3 is present invention offer is humorous Wave error measures the structural representation of system.
In Fig. 2 and Fig. 3, what CT0 represented is standard current transformer, and it is conventional current transformer, CTx represent by Survey current transformer.MU is the combining unit being connected with electronic current mutual inductor.In sum, the harmonic wave electricity that the present invention provides Stream error measurement apparatus, it is possible to take into account conventional current transformer and electronic current mutual inductor, has complete test and multiple Miscellaneous function.Stress_responsive genes precision is reached 0.1 grade, first-harmonic error precision 0.02 grade.For the electronics having combining unit to export Formula current transformer, harmonic current error measuring means support synchronizes and the mode of asynchronous measurement, and synchronizing signal can be defeated The pulse per second (PPS) entered or export and IRIG-B.
It is connected with standard current transformer 2 and tested current transformer 3 respectively, for standard signal and measured signal are turned Change pending signal into and send the harmonic current measurement device 4 to host computer 5;
As preferably, harmonic current measurement device 4 includes:
The relay module that is sequentially connected with, AD sampling module, the 2nd FPGA, stm32 and switch, wherein, relay Module includes that sampling resistor, AD sampling module include that ADC sampling A/D chip, switch are connected with host computer 5;
Specifically, AD sampling module here includes 24 high-precision adc sampling A/D chip.
Harmonic current measurement device 4 also includes:
The synchronization module being connected with the 2nd FPGA and FT3 module;
The first electrical network mouth, the second electrical network mouth, the first smooth network interface and the second smooth network interface being connected with switch;
The 3rd smooth network interface being connected with switch by the 3rd FPGA.
Specifically, refer to the schematic diagram of a kind of harmonic current measurement device that Fig. 4, Fig. 4 provide for the present invention.
Wherein, standard channel data process:
When standard channel connects standard current transformer 2 analog quantity (5A/1A) port, select 5A range and 1A at host computer 5 Range, host computer 5 sends instruction by udp protocol to stm32, and stm32 controls relay module according to instruction and is switched to specify Range path, the big electric current of input changes into voltage signal through sampling resistor and delivers to AD sampling module;AD sampling module is the most right Voltage signal processes through channel selecting, programming amplifying, differential attenuation etc., is sent to ADC sampling A/D chip and (is specifically as follows AD127X analog-to-digital conversion chip);2nd FPGA controls ADC sampling A/D chip according to synchronizing signal and analog sampling value is changed into numeral Amount is also stored by SPI protocol data of reading back;Stm32 uses the agreement of FSMC bus to will be stored in the data in the 2nd FPGA The form reading out and being packaged into UDP message delivers to host computer 5, host computer 5 standard harmonic amount data are carried out calculation process;
When standard channel connects simulation small voltage port, the small voltage of input is directly sent to AD sampling module;AD sampling module Voltage signal is sent to ADC sampling A/D chip after channel selecting, programming amplifying, differential attenuation etc. process;2nd FPGA according to Synchronizing signal controls ADC sampling A/D chip and analog sampling value changes into digital quantity and stores by SPI protocol data of reading back; Stm32 uses the agreement of FSMC bus to will be stored in the data read-out in the 2nd FPGA to come and be packaged into the form of UDP message to send To host computer 5, host computer 5 standard harmonic amount data are carried out calculation process;
Tested channel data processes:
When tested passage connects big electric current (5A/1A) port, selecting 5A range and 1A range at host computer 5, host computer 5 passes through Udp protocol sends instruction to stm32, and stm32 controls relay module according to instruction and is switched to specify range path, input big Electric current changes into voltage signal through sampling resistor and delivers to AD sampling module;AD sampling module to voltage signal through channel selecting, Programming amplifying, differential attenuation etc. are sent to ADC sampling A/D chip after processing;2nd PFGA controls ADC sampling A/D chip according to synchronizing signal Analog sampling value is changed into digital quantity and stores by SPI protocol data of reading back;The agreement of stm32 employing FSMC bus will The data read-out being stored in the 2nd PFGA is come and is packaged into the form of UDP message to deliver to host computer 5, by host computer 5 to tested Harmonic content data carry out calculation process;
When tested passage connects simulation small voltage port, the small voltage of input is directly sent to AD sampling module;AD sampling module Voltage signal is sent to ADC sampling A/D chip after channel selecting, programming amplifying, differential attenuation etc. process;2nd PFGA according to Synchronizing signal controls ADC sampling A/D chip and analog sampling value changes into digital quantity and stores by SPI protocol data of reading back; Stm32 uses the agreement of FSMC bus to will be stored in the data read-out in the 2nd PFGA to come and be packaged into the form of UDP message to send To host computer 5, host computer 5 tested harmonic content data are carried out calculation process;
Be measured as digital quantity, use IEC61850 agreement, when having synchronizing signal, optical fiber is according to tail optical fiber type (ST/SC) Being connected on the first smooth network interface or the second smooth network interface, twisted-pair feeder can be connected on any one electrical network mouth (the first electrical network mouth or second Electrical network mouth) on, IEC61850 message is directly sent to host computer 5 by switch, by host computer 5 analytic message, takes out tested humorous Ripple amount data, row operation of going forward side by side processes;Be measured as digital quantity, use IEC61850 agreement, without synchronizing signal time, optical fiber is connect 3rd smooth network interface (only supports SC mouth);IEC61850 message is delivered at the 3rd PFGA, by the 3rd PFGA analytic message and Inside delivers to host computer 5 by network interface through switch again plus temporal information, 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 employing FT3 agreement, selecting FT3 port, FT3 signal is sent after opto-electronic conversion by signal On the 2nd PFGA, the data that inside is comprised by the 2nd PFGA by resolving FT3 message are taken out and are stored, stm32 adopt After reading to walk by data with FSMC bus protocol, the form being packaged into UDP message in stm32 delivers to host computer 5, and host computer 5 will Tested harmonic content data parsing in UDP message out carries out calculation process.
It is connected with harmonic wave high-current generation device 1 and harmonic current measurement device 4 respectively, for according to pending signal Obtain first-harmonic until the host computer 5 of error of the content of n times harmonic wave, ratio and angular difference.
It is understood that the pending signal that harmonic current measurement device 4 is transmitted by host computer 5 carries out Fourier transformation Computing, just can calculate first-harmonic and the content of each harmonic, ratio and angular difference.
The formula of Fourier transformation is as follows:
x ( t ) = a 0 + Σ n = 1 ∞ ( a n cos nω 0 t + b n sin nω 0 t ) , n = 1 , 2 , 3 , ...
Fourier coefficient:
a 0 = 1 T ∫ - T 2 T 2 x ( t ) d t
a n = 2 T ∫ - T 2 T 2 x ( t ) cos nω 0 t d t
b n = 2 T ∫ - T 2 T 2 x ( t ) sin nω 0 t d t
In formula: T is the cycle;ω0For fundamental frequency, ω0=2 π/T0,T0For the signal primitive period.
The another kind of 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 angular difference of first-harmonic and each harmonic:
In formula: KnFor nth harmonic ratio, δnFor nth harmonic angular difference.
Visible, the nth harmonic impact on current transformer can be obtained according to the content of nth harmonic, ratio and angular difference, also I.e. error during current transformer collection nth harmonic.
It addition, host computer 5 meets multiple test request, rich interface, it is possible to various electron sources are carried out first-harmonic and harmonic wave The control of content, and automatically carry out slope according to setting, receive various electricity and error that stress_responsive genes instrument sends simultaneously Data signal, forms test record inside local data base, facilitates follow-up analysis and inquiry.
To sum up, the present invention can be known the big electric current of harmonic wave that harmonic wave high-current generation device produces according to harmonic wave mechanism, Can know harmonic wave on current transformer once, the impact of secondary current signal, and then obtain harmonic wave to tested current transformer The impact of error (ratio difference, angular difference) between the standard signal of the measured signal of output and standard current transformer output;Can Know the harmonic current error measuring means ratio to measured signal under the analysis of harmonic signal and each harmonic with standard signal Difference, angular difference.
The invention provides a kind of current transformer harmonic error and measure system, this system includes for generating the big electricity of harmonic wave The harmonic wave high-current generation device of stream;Measure for electric current big to harmonic wave, obtain the standard current transformer of standard signal; Measure for electric current big to harmonic wave, obtain the tested current transformer of measured signal;For by standard signal and tested letter Number it is converted into pending signal and sends the harmonic current measurement device to host computer;For obtaining first-harmonic according to pending signal Until the host computer of the content of n times harmonic wave, ratio and angular difference.Visible, the application is by generating the big electricity of harmonic wave of the big electric current of harmonic wave Flow generating apparatus simulates power system environment, then according to the tested current transformer that electric current big to harmonic wave measures respectively with And the measured signal that records of standard current transformer and standard signal obtain first-harmonic and the content of n times harmonic wave, ratio and angular difference, By the comparison with standard current transformer, just would know that current transformer error when to harmonic measure, and then obtain humorous Error (ratio between measured signal and the standard signal of standard current transformer output that tested current transformer is exported by ripple Difference, angular difference) impact, facilitate follow-up tested current transformer being improved and accurate measurement to harmonic wave.
It should be noted that in this manual, the relational terms of such as first and second or the like is used merely to one Individual entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operate it Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant are intended to Contain comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include those Key element, but also include other key elements being not expressly set out, or also include for this process, method, article or set Standby intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that Other identical element is there is also in including the process of described key element, method, article or equipment.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention. Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one The widest scope caused.

Claims (8)

1. a current transformer harmonic error measures system, it is characterised in that including:
For receiving and inputting the first-harmonic to host computer, 3 subharmonic, 5 subharmonic until the parameter of n times harmonic wave generates according to user The harmonic wave high-current generation device of the big electric current of harmonic wave, wherein, described parameter includes described first-harmonic until the content of n times harmonic wave, width Value, phase place and frequency, N is the odd number not less than 3;
It is connected with described harmonic wave high-current generation device, measures for electric current big to described harmonic wave, obtain standard signal Standard current transformer;
It is connected with described harmonic wave high-current generation device, measures for electric current big to described harmonic wave, obtain measured signal Tested current transformer;
It is connected with described standard current transformer and described tested current transformer respectively, for by described standard signal and described Measured signal is converted into pending signal and sends the harmonic current measurement device to described host computer;
It is connected with described harmonic wave high-current generation device and described harmonic current measurement device respectively, for waiting to locate described in foundation Reason signal obtains described first-harmonic until the described host computer of the content of n times harmonic wave, ratio and angular difference.
2. current transformer harmonic error as claimed in claim 1 measures system, it is characterised in that N is the odd number more than 9, Described harmonic wave high-current generation device includes:
Be connected with described host computer, for receive described host computer according to user input first-harmonic, 3 subharmonic, 5 subharmonic until The parameter of n times harmonic wave correspondence respectively generates first-harmonic and generates instruction until 7 subharmonic generate instruction and 9-N combined harmonic generates Oneth FPGA of instruction;
Input is connected with a described FPGA, for generating the fundamental power of instruction generation fundamental signal according to described first-harmonic Source;
Input is connected with a described FPGA, for generating 3 subharmonic of instruction generation 3 rd harmonic signal according to 3 subharmonic Power source;
Input is connected with a described FPGA, for generating 5 subharmonic of instruction generation 5 rd harmonic signal according to 5 subharmonic Power source;
Input is connected, is used for generating according to described 7 subharmonic 7 times of instruction generation 7 rd harmonic signal with a described FPGA Harmonic power source;
Input is connected with a described FPGA, for being combined humorous 9-N time according to described 9-N combined harmonic generation instruction generation The combined harmonic power source of ripple signal;
Respectively with the outfan in described fundamental power source, the outfan of 3 subharmonic power sources, the outfan of 5 subharmonic power sources, The outfan of the outfan of 7 subharmonic power sources and combined harmonic power source connects, for by described fundamental signal, 3 times humorous The current lifting device that ripple signal, 5 rd harmonic signal, 7 rd harmonic signal and 9-N combined harmonic signal carry out coupling and amplifying.
3. current transformer harmonic error as claimed in claim 2 measures system, it is characterised in that N is 19.
4. current transformer harmonic error as claimed in claim 2 measures system, it is characterised in that described normalized current mutual inductance Device is the current transformer of 0.05S level.
5. current transformer harmonic error as claimed in claim 2 measures system, it is characterised in that described normalized current mutual inductance Device is high-accuracy current divider.
6. current transformer harmonic error as claimed in claim 2 measures system, it is characterised in that described tested Current Mutual Inductance Device is the current transformer of 0.2 grade.
7. current transformer harmonic error as claimed in claim 2 measures system, it is characterised in that described tested Current Mutual Inductance Device is electronic current mutual inductor.
8. the current transformer harmonic error as described in any one of claim 1-7 measures system, it is characterised in that described harmonic wave Current measuring device includes:
The relay module that is sequentially connected with, AD sampling module, the 2nd FPGA, stm32 and switch, wherein, described relay Module includes that sampling resistor, described AD sampling module include that ADC sampling A/D chip, described switch are connected with described host computer;
Described harmonic current measurement device also includes:
The synchronization module being connected with described 2nd FPGA and FT3 module;
The first electrical network mouth, the second electrical network mouth, the first smooth network interface and the second smooth network interface being connected with described switch;
The 3rd smooth network interface being connected with described switch by the 3rd FPGA.
CN201610657433.3A 2016-08-11 2016-08-11 A kind of current transformer harmonic error measuring system Active CN106054102B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610657433.3A CN106054102B (en) 2016-08-11 2016-08-11 A kind of current transformer harmonic error measuring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610657433.3A CN106054102B (en) 2016-08-11 2016-08-11 A kind of current transformer harmonic error measuring system

Publications (2)

Publication Number Publication Date
CN106054102A true CN106054102A (en) 2016-10-26
CN106054102B CN106054102B (en) 2019-10-11

Family

ID=57481601

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610657433.3A Active CN106054102B (en) 2016-08-11 2016-08-11 A kind of current transformer harmonic error measuring system

Country Status (1)

Country Link
CN (1) CN106054102B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108519512A (en) * 2018-03-23 2018-09-11 深圳市计量质量检测研究院 Method and system for high-precision harmonic measure
CN108717172A (en) * 2018-04-13 2018-10-30 中国电力科学研究院有限公司 A kind of mutual inductor dynamic error test system and method
CN112710879A (en) * 2021-03-26 2021-04-27 中国电力科学研究院有限公司 Multiple harmonic wave superposition current generation device and method for temperature rise test
CN115542230A (en) * 2022-11-24 2022-12-30 武汉格蓝若智能技术股份有限公司 Current transformer error estimation method and device based on diffusion model
WO2023040557A1 (en) * 2021-09-16 2023-03-23 国网湖北省电力有限公司营销服务中心(计量中心) Error detection apparatus for pulsating harmonic signal direct-current transformer

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101604009A (en) * 2009-07-22 2009-12-16 天津市电力公司 Method for verifying universal electronic type mutual inductor
CN201373912Y (en) * 2009-01-13 2009-12-30 国网电力科学研究院 Calibration testing device for extra high-voltage DC current transformer
CN102375106A (en) * 2011-08-18 2012-03-14 安徽省电力科学研究院 Device for testing harmonic influence of electronic mutual inductor
CN102879758A (en) * 2012-09-18 2013-01-16 广东电网公司电力科学研究院 Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer
CN103792508A (en) * 2014-01-27 2014-05-14 国家电网公司 Error test system and method for digitized metering device
CN104820199A (en) * 2015-04-13 2015-08-05 广东电网有限责任公司电力科学研究院 DC large-current measuring device ripple responsiveness test system and method thereof
CN105548942A (en) * 2016-01-18 2016-05-04 云南电网有限责任公司电力科学研究院 System and method for analyzing transient characteristics of electronic current transformer
CN205920215U (en) * 2016-08-11 2017-02-01 国网浙江省电力公司电力科学研究院 Current transformer harmonic error measurement system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201373912Y (en) * 2009-01-13 2009-12-30 国网电力科学研究院 Calibration testing device for extra high-voltage DC current transformer
CN101604009A (en) * 2009-07-22 2009-12-16 天津市电力公司 Method for verifying universal electronic type mutual inductor
CN102375106A (en) * 2011-08-18 2012-03-14 安徽省电力科学研究院 Device for testing harmonic influence of electronic mutual inductor
CN102879758A (en) * 2012-09-18 2013-01-16 广东电网公司电力科学研究院 Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer
CN103792508A (en) * 2014-01-27 2014-05-14 国家电网公司 Error test system and method for digitized metering device
CN104820199A (en) * 2015-04-13 2015-08-05 广东电网有限责任公司电力科学研究院 DC large-current measuring device ripple responsiveness test system and method thereof
CN105548942A (en) * 2016-01-18 2016-05-04 云南电网有限责任公司电力科学研究院 System and method for analyzing transient characteristics of electronic current transformer
CN205920215U (en) * 2016-08-11 2017-02-01 国网浙江省电力公司电力科学研究院 Current transformer harmonic error measurement system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108519512A (en) * 2018-03-23 2018-09-11 深圳市计量质量检测研究院 Method and system for high-precision harmonic measure
CN108519512B (en) * 2018-03-23 2020-05-22 深圳市计量质量检测研究院 Method and system for high precision harmonic measurement
CN108717172A (en) * 2018-04-13 2018-10-30 中国电力科学研究院有限公司 A kind of mutual inductor dynamic error test system and method
CN112710879A (en) * 2021-03-26 2021-04-27 中国电力科学研究院有限公司 Multiple harmonic wave superposition current generation device and method for temperature rise test
WO2023040557A1 (en) * 2021-09-16 2023-03-23 国网湖北省电力有限公司营销服务中心(计量中心) Error detection apparatus for pulsating harmonic signal direct-current transformer
CN115542230A (en) * 2022-11-24 2022-12-30 武汉格蓝若智能技术股份有限公司 Current transformer error estimation method and device based on diffusion model
CN115542230B (en) * 2022-11-24 2023-03-24 武汉格蓝若智能技术股份有限公司 Current transformer error estimation method and device based on diffusion model

Also Published As

Publication number Publication date
CN106054102B (en) 2019-10-11

Similar Documents

Publication Publication Date Title
CN103792508B (en) The error testing system of the digitized measurement device and method of testing
CN106054102A (en) Current-transformer harmonic wave error measurement system
CN101865986B (en) System and method for checking error of high-voltage electric energy measurement device
CN101807795B (en) Method for forming electric energy metering simulation system and device thereof
CN103543430B (en) Standard modulus synchronous signal source
CN104330765B (en) Electric energy meter field calibrating installation based on satellite navigation system
CN201425621Y (en) Error checking system of high-voltage electric energy metering device
CN201438211U (en) Electronic transformer calibrator
CN202758062U (en) Overall metering error detection system of digital transformer station electric energy metering device
CN203465409U (en) Standard analog-digital synchronization signal source
CN104483650B (en) A kind of correction method of ammeter
CN102375106A (en) Device for testing harmonic influence of electronic mutual inductor
CN103941211A (en) Novel automatic checking method of analogue input merging unit
CN102928803A (en) Electronic transformer checking device based on synchronization pulse output power supply
CN106646334B (en) Method and system for calculating metering error of electric energy meter
CN109407033A (en) A kind of calibration equipment of direct current instrument transformer transient state tester
CN103543323A (en) Current detection device for large direct current charge-discharge facility
Adamo et al. A proposal for an open source energy meter
CN103901389A (en) Verifying device and method of analog electric signal electric energy meter, analog electronic signal electric energy meter and digital signal electric energy meter
CN105676160B (en) A kind of electronic transducer calibration instrument source tracing method and system
CN105203981A (en) Field inspection device and method of grounding current on-line monitoring equipment for transformer core
CN205608171U (en) Digital electric energy measurement system's testing arrangement
CN202939299U (en) Electronic transformer calibration device based on synchronous pulse output power supply
CN205920215U (en) Current transformer harmonic error measurement system
CN102520384A (en) Digital output electronic type mutual inductor conversion time delay test method

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20170510

Address after: Hangzhou City, Zhejiang province 310014 eight District No. 1, Huadian Zhaohui

Applicant after: Electric Power Research Institute of State Grid Zhejiang Electric Power Company

Applicant after: State Grid Corporation of China

Applicant after: Ningbo Sunrise Instruments Co., Ltd.

Address before: Hangzhou City, Zhejiang province 310014 eight District No. 1, Huadian Zhaohui

Applicant before: Electric Power Research Institute of State Grid Zhejiang Electric Power Company

Applicant before: State Grid Corporation of China

GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20210111

Address after: 311100 Building 5, 138 Yunlian Road, Yuhang District, Hangzhou City, Zhejiang Province

Patentee after: Marketing service center of State Grid Zhejiang Electric Power Co., Ltd

Patentee after: STATE GRID CORPORATION OF CHINA

Patentee after: NINGBO SUNRISE INSTRUMENTS Co.,Ltd.

Address before: Hangzhou City, Zhejiang province 310014 eight District No. 1, Huadian Zhaohui

Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID ZHEJIANG ELECTRIC POWER Co.

Patentee before: State Grid Corporation of China

Patentee before: NINGBO SUNRISE INSTRUMENTS Co.,Ltd.