CN208207186U - Anti- DC component current transformer error tester - Google Patents
Anti- DC component current transformer error tester Download PDFInfo
- Publication number
- CN208207186U CN208207186U CN201820561763.7U CN201820561763U CN208207186U CN 208207186 U CN208207186 U CN 208207186U CN 201820561763 U CN201820561763 U CN 201820561763U CN 208207186 U CN208207186 U CN 208207186U
- Authority
- CN
- China
- Prior art keywords
- current
- current transformer
- binding post
- wave
- connect
- 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.)
- Active
Links
Abstract
The utility model relates to Electric Energy Metering Technology fields, it is a kind of anti-DC component current transformer error tester, the former includes shell, anti-DC component current transformer test circuit and data processing unit, the anti-DC component current transformer test circuit and data processing unit are arranged in shell, and anti-DC component current transformer test circuit includes pressure regulator, current lifting device, the first rectifier diode, the second rectifier diode, current-limiting resistance, the first half-wave current sampling resistor, second half-wave current sampling resistor etc..The utility model is flowed up using pressure regulator and current lifting device, half-wave current is exported using diode rectification, half-wave current and mutual inductor secondary current are sampled using measuring resistance, using simple and reliable amplifying circuit and high-resolution A/D sample conversion module, the ratio error and phase error of fundamental wave are obtained.Since circuit design is reasonable, it is accurate to calculate, and the accuracy of device and stability are all protected.
Description
Technical field
The utility model relates to Electric Energy Metering Technology fields, are a kind of anti-DC component current transformer error testers,
Full name is based on the anti-DC component current transformer error tester under halfwave rectifier.
Background technique
Electric energy meter is the important measurement instrument in electric energy metering device, country using electric energy meter as mandatory calibrating project,
It needs according to JJG596-2012 " electronic type AC energy meter vertification regulation " to its gauging error；But calibrating project can not
Cover all working state of electric energy meter.GB/T 17215.321-2008 " exchange electrical measuring device, particular/special requirement, the 21st
Point, state type active electric energy meter (1 grade and 2 grades) " in specify that halfwave rectifier to the limit value of the influence amount of electric energy meter error, provides
Half wave rectification testing line and direct current and each harmonic content.Direct access state type active energy is determined by testing
For table when passing through half-wave rectified current, it is negative error that error, which obviously increases, and is wanted without reference to GB/T 17215.321-2008
Electric energy meter error under asking can be more than even -50% or more, cause very big loss to electrical energy measurement.By testing clear half
It is sampling Current Transformer that wave rectified current, which measures electric energy meter and generates the critical component of significant impact, meets prescribed requirement
The current transformer installed in electric energy meter error under half-wave rectified current is not more than ± 3%, and angular difference is not more than ± 500 '.It is this
Can satisfactory current transformer be commonly referred to as anti-DC component current transformer.There is no one on domestic market
Mature technology is planted to measure error of the anti-DC component current transformer under half-wave current, so that electric energy meter manufacturer is only
It can be confirmed whether to meet the requirements by the test circuit of standard offer after installation, checkability is low.If occur due to
The loss of electrical energy measurement caused by the reason of mutual inductor quality is very big.
Summary of the invention
The utility model provides a kind of anti-DC component current transformer error tester based under halfwave rectifier, gram
The deficiency for having taken the above-mentioned prior art, can effectively solve existing device cannot be used to measure anti-DC component current transformer
Half-wave current under error, can only be confirmed whether to close by the test circuit that standard provides after installation electric energy meter is completed
It requires, there is a problem of that checkability is low.
The technical solution of the utility model is realized by following measures: should be based on the anti-direct current under halfwave rectifier point
Amount current transformer error tester includes shell, anti-DC component current transformer test circuit and data processing unit, institute
It states anti-DC component current transformer test circuit and data processing unit is arranged in shell, anti-DC component Current Mutual Inductance
Device test circuit includes pressure regulator, current lifting device, the first rectifier diode, the second rectifier diode, current-limiting resistance, the first half-wave electricity
Flow sampling resistor, the second half-wave current sampling resistor, the external AC power source of the input terminal of the pressure regulator, the output end of pressure regulator
It is connect respectively with the first binding post of current lifting device and the second binding post, current lifting device third binding post rectifies two in parallel first respectively
The anode of pole pipe is connected with the cathode of the second rectifier diode, and the 4th binding post of current lifting device is connect with current-limiting resistance, current-limiting resistance
External build-out resistor, first the first binding post of half-wave current sampling resistor and are connected between the first rectifier diode cathode
The connection of two rectifier diode anodes, data processing unit includes A/D sample conversion module, data processing module and ARM module, A/
D sample conversion module is connect with data processing module, and ARM module obtains the basic test information of tested current transformer, ARM mould
The tested current transformer basic test information of input is sent to data processing module by block.
Here is the further optimization and/or improvements to above-mentioned utility model technical solution:
External trace to the source the first binding post of interface and external the second wiring of interface of tracing to the source are additionally provided on above-mentioned hull outside face
Column, first half-wave current sampling resistor second and third binding post be connected to it is external trace to the source on the first binding post of interface, the second half-wave electricity
Stream sampling resistor two binding posts be both connected to it is external trace to the source on the second binding post of interface, external the first binding post of interface of tracing to the source
It is connect with A/D sample conversion module with external the second binding post of interface of tracing to the source.
Above-mentioned external trace to the source is connected with the amplification of the first controllable gain between the first binding post of interface and A/D sample conversion module
Device, external trace to the source are connected with the second controllable gain amplifier between the second binding post of interface and A/D sample conversion module.
Above-mentioned further includes communication module and host computer, and host computer is connect with ARM module by communication module.
Above-mentioned further includes keyboard and display, and keyboard and display are connect with ARM module.
Above-mentioned further includes data storage, and data storage is connect with ARM module.
Above-mentioned to be additionally provided with radiation panel, radiation panel is fixedly mounted on and the first half-wave current sampling resistor and the second half
On the metal base plate of the corresponding housing bottom in wave current sampling resistor position.
The utility model has following technical effect that
1, the utility model is flowed up using pressure regulator and current lifting device, is exported half-wave current using diode rectification, is used
Measuring resistance samples a half-wave current and mutual inductor secondary current, using simple and reliable amplifying circuit and high-resolution
A/D sample conversion module, pass through each harmonic content that FFT fast Fourier algorithm calculates primary current and secondary current
Size and phase relation, and then obtain the ratio error and phase error of fundamental wave.Since circuit design is reasonable, algorithm is quasi-
Really, the accuracy of device and stability are protected.By using 14 A/D sample conversion module measuring signals, the resolution of A/D
Rate is 1/8192, therefore calibrates anti-DC component current transformer and can achieve 0.1% accuracy.Anti- DC component electric current is mutual
Sensor requires to be 3%, meets the needs of test accuracy；
2, pressure regulator, current lifting device, current-limiting resistance and the first rectifier diode D1 and second that the utility model uses are whole
It flows diode D2 and realizes output half-wave current, output waveform is consistent with real work electric current.Output capacity is big, and current range is covered
Gai Kuan meets the testing requirement of all miniature anti-DC component current transformers；
3, the impedance matching function that the utility model uses can effectively reduce the asymmetric feelings of sine wave half-wave up and down
Condition tests influence of the DC current to current lifting device and pressure regulator；
4, the utility model is generated using DSP digital signal processor timer internal tranmitting data register signal method to sine
The principle of wave signal complete cycle wave sampling, thus the frequency of measured signal can be 50Hz, 60Hz or other frequencies.First controllable increasing
For line in beneficial amplifier and the second controllable gain amplifier using 0.02 grade around precision resistance, circuit full dose limit meets 0.05 grade
Amplify accuracy and the linearity.More automation functions may be implemented using human-computer interaction module and data processing module；
5, the utility model does not need by the way of standard current transformer and error of measurement checking circuit, it is only necessary to input quilt
The basic parameter of anti-DC component current transformer is examined, there is good adaptability.Lead to after measuring A/D discrete data floating-point
Cross data processing module calculating, other than it can analyze fundamental wave and direct current signal, the case where each harmonic can also be analyzed.
Detailed description of the invention
Attached drawing 1 is the circuit connection diagram of the utility model.
Attached drawing 2 is that tracing to the source for the utility model detects wiring diagram.
It is the first half-wave current sampling resistor that coding in attached drawing, which is respectively as follows: R1, and R2 is the second half-wave current sampling resistor,
R3 is current-limiting resistance, and D1 is the first rectifier diode, and D2 is the second rectifier diode, and CH1 is external the first wiring of interface of tracing to the source
Column, CH2 are external the second binding post of interface of tracing to the source, and CT is anti-DC component current transformer.
Specific embodiment
The utility model is not limited by following embodiments, can technical solution according to the present utility model and actual conditions
Determine specific embodiment.
The utility model is further described below with reference to examples and drawings:
It as shown in Fig. 1, include shell based on the anti-DC component current transformer error tester under halfwave rectifier, anti-
DC component current transformer tests circuit and data processing unit, and the anti-DC component current transformer tests circuit sum number
It is arranged in shell according to processing unit, anti-DC component current transformer test circuit includes pressure regulator, current lifting device, first whole
Stream diode D1, the second rectifier diode D2, current-limiting resistance R3, the first half-wave current sampling resistor R1, the second half-wave current are adopted
Sample resistance R2, the external AC power source of the input terminal of the pressure regulator, the output end of pressure regulator respectively with the first binding post of current lifting device
It is connected with the second binding post, current lifting device third binding post is rectified with the anode of the first rectifier diode D1 in parallel and second respectively
The cathode of diode D2 connects, and the 4th binding post of current lifting device is connect with current-limiting resistance R3, two poles of the rectification of current-limiting resistance R3 and first
External build-out resistor, first the first binding post of half-wave current sampling resistor R1 and the second two poles of rectification are connected between pipe D1 cathode
The connection of pipe D2 anode, data processing unit include A/D sample conversion module, data processing module and ARM module, and A/D sampling turns
Mold changing block is connect with data processing module, and ARM module obtains the basic test information of tested current transformer, and ARM module will be defeated
The tested current transformer basic test information entered is sent to data processing module.
In actual use, the primary coil for being detected anti-DC component Current Transmit is connected on the sampling of the first half-wave current
Between resistance R1 and current-limiting resistance R3, the secondary coil and the second half-wave current for being detected anti-DC component Current Transmit are sampled
Resistance R2 is in parallel, and the half-wave current all the way come out from current lifting device is by being detected anti-DC component Current Transmit and the first half-wave
Current sampling resistor R1, another way half-wave current is converged again by external matching impedance and preceding half-wave current all the way passes through limit
Leakage resistance R3, is back to current lifting device.The purposes of current-limiting resistance: can improve the waveform of half-wave current, make half-wave current waveform and resist
Waveform in DC component practical application is consistent.If not current-limiting resistance R3, since test loop impedance is very low, cause
Current lifting device output voltage only needs to overcome the conducting voltage of rectifier diode can just reach the size for testing electric current quickly later,
But since the pulsewidth of rectifier diode conducting is relatively narrow, output half-wave current is similar as pulse current, rather than half-wave is electric
Stream.Current-limiting resistance R3 can undertake the voltage of more ratio, and rectifier diode conducting voltage accounts for compared with current lifting device output voltage
It is smaller, it is consistent with the half-wave current of real work.
Above-mentioned data processing module is designed by the processor of DSP core, is the key that device observing and controlling component；Data processing mould
It is equipped with timer inside block, continuously sends a clock signal and gives A/D sample conversion module, A/D sample conversion module
As enabling signal, it is 512 times of power frequency component that the frequency of clock signal, which is 2.56kHz,.Operator rotates on case panel
Pressure regulator knob, 0V~250V voltage can be exported, which can be through current lifting device output 0A~100A for decompression
Alternating current.Operator exports corresponding alternating current amplitude (Imax/ as needed).Imax is tested Current Mutual Inductance
The maximum operating currenbt of device.Generally tested current transformer Imax has 60A, 100A etc..
It is man-machine right that the S3C44B0 embedded system structure that Samsung ARM7TDMI kernel can be used in above-mentioned ARM module is realized
Words, S3C44B0 are 16/32 bit processors (66MHz) using 160LQFP encapsulation.Provide build-in components abundant and comprehensively
, general On-Chip peripheral, greatly reduce the component configuration in circuit system in addition to processor.To minimize this reality
With novel cost.Basic parameter and operational order are sent to data processing by ARM module and data processing module data interaction
Data are returned to ARM module after data processing module processing by module.
The measurement and calculating of DSP digital signal processor realization analog quantity can be used in data processing module, to realize half-wave
The measurement of rectified current transformer error.DSP digital signal processor refers to the current mutual-inductor parameter that ARM module is sent is received
It enables, DSP digital signal processor carries out complete cycle wave sampling 512 to power frequency component using Timer Controlling A/D sample conversion module
Point, A/D sample conversion module measure the voltage on the first half-wave current sampling resistor and the second half-wave current sampling resistor, make A/
The sampled voltage of D sample conversion module in linearly interval, guarantees that measurement is accurate always.Current Mutual Inductance is obtained by calculation formula
The ratio difference and angular difference value of device fundamental wave.
MAX125BCNI converter can be used in sample conversion module.The A/D sample conversion module is a kind of high speed, multi-pass
Road, 12 modulus conversion chips, modulus conversion chip inside is with one 14, the Approach by inchmeal that conversion time is 3 microseconds
Type modulus circuit, 4 × 14 RAM can be with the ternary output device of digital signal processor bus interface；Have in piece 4 adopt/
It protects (T/H), the output each adopted/protected corresponding one 2 is selected 1 simulation input (to share 8 analog input channels, 4 one group, be divided into A
With two groups of B), output selects 1 switch to A/D sample conversion module through 4.
The above-mentioned anti-DC component current transformer error tester based under halfwave rectifier can be made according to actual needs
Further optimization and/or improvements:
As shown in Fig. 1, it is additionally provided on hull outside face and external traces to the source interface the first binding post CH1 and external trace to the source connects
Mouthful second binding post CH2, first half-wave current sampling resistor R1 second and third binding post are connected to external the first wiring of interface of tracing to the source
On column CH1, two binding posts of the second half-wave current sampling resistor R2 are both connected to external the second binding post of interface CH2 that traces to the source
On, external interface the first binding post CH1 and external the second binding post of interface CH2 that traces to the source that traces to the source connects with A/D sample conversion module
It connects.Here external interface the first binding post CH1 and external the second binding post of interface CH2 that traces to the source that traces to the source being arranged on hull outside face
It is used to higher level's correcting mechanism and carries out error to based on the anti-DC component current transformer error tester under halfwave rectifier
Calibration, staff is as needed, and first half-wave current sampling resistor R1 second and third binding post is connected to external trace to the source manually
On the first binding post of interface CH1, two binding posts of the second half-wave current sampling resistor R2 are connected to external trace to the source manually and connect
On the second binding post CH2 of mouth.
As shown in Fig. 1, first is connected between external interface the first binding post CH1 and A/D sample conversion module of tracing to the source
Controllable gain amplifier is connected with second between external interface the second binding post CH2 and A/D sample conversion module of tracing to the source and controllable increases
Beneficial amplifier.
It as needed, further include communication module and host computer, host computer is connect with ARM module by communication module.It is upper
After machine is connect with ARM module, host computer can realize the measurement data of the automatic tested current transformer for obtaining calibration, can also be with
Carry out data management.
It as shown in Fig. 1, further include keyboard and display, keyboard and display are connect with ARM module.Here display
Device can be liquid crystal display, for showing test data, and show it is apparent, convenient for staff record check data.
It as shown in Fig. 1, further include data storage, data storage is connect with ARM module.
As needed, it is additionally provided with radiation panel, radiation panel is fixedly mounted on and the first half-wave current sampling resistor R1
In housing bottom surface corresponding with the second half-wave current position sampling resistor R2.Radiation panel plays heat spreading function, ensures the
The temperature rise of one half-wave current sampling resistor R1 and the second half-wave current sampling resistor R2 have ensured the accurate of sampling less than 30 degree
Degree.
The above technical characteristic constitutes the embodiments of the present invention, can with stronger adaptability and implementation result
Increase and decrease non-essential technical characteristic, according to actual needs to meet the needs of different situations.
Claims (9)
1. a kind of anti-DC component current transformer error tester, it is characterised in that mutual including shell, anti-DC component electric current
Sensor tests circuit and data processing unit, and the anti-DC component current transformer test circuit and data processing unit are all provided with
It sets in shell, anti-DC component current transformer test circuit includes pressure regulator, current lifting device, the first rectifier diode, second
Rectifier diode, current-limiting resistance, the first half-wave current sampling resistor, the second half-wave current sampling resistor, the pressure regulator it is defeated
Enter to hold external AC power source, the output end of pressure regulator is connect with the first binding post of current lifting device and the second binding post respectively, current lifting device
Third binding post is connect with the cathode of the anode of the first rectifier diode in parallel and the second rectifier diode respectively, current lifting device the
Four binding posts are connect with current-limiting resistance, and external build-out resistor is connected between current-limiting resistance and the first rectifier diode cathode, the
One the first binding post of half-wave current sampling resistor is connect with the second rectifier diode anode, and data processing unit includes A/D sampling
Conversion module, data processing module and ARM module, A/D sample conversion module are connect with data processing module, and ARM module obtains
The tested current transformer basic test information of input is sent to by the basic test information of tested current transformer, ARM module
Data processing module.
2. anti-DC component current transformer error tester according to claim 1, it is characterised in that hull outside face
On be additionally provided with external trace to the source the first binding post of interface and external the second binding post of interface of tracing to the source, the first half-wave current sampling resistor
Second and third binding post be connected to it is external trace to the source on the first binding post of interface, two binding posts of the second half-wave current sampling resistor
Be both connected to it is external trace to the source on the second binding post of interface, external trace to the source the first binding post of interface and external the second wiring of interface of tracing to the source
Column is connect with A/D sample conversion module.
3. anti-DC component current transformer error tester according to claim 2, it is characterised in that external trace to the source connects
It is connected with the first controllable gain amplifier between the first binding post of mouth and A/D sample conversion module, external interface second of tracing to the source connects
The second controllable gain amplifier is connected between terminal and A/D sample conversion module.
4. anti-DC component current transformer error tester according to claim 1 or 2 or 3, it is characterised in that also wrap
Communication module and host computer are included, host computer is connect with ARM module by communication module.
5. anti-DC component current transformer error tester according to claim 1 or 2 or 3, it is characterised in that also wrap
Keyboard and display are included, keyboard and display are connect with ARM module.
6. anti-DC component current transformer error tester according to claim 4, it is characterised in that further include keyboard
And display, keyboard and display are connect with ARM module.
7. anti-DC component current transformer error tester according to claim 1 or 2 or 3, it is characterised in that also wrap
Data storage is included, data storage is connect with ARM module.
8. anti-DC component current transformer error tester according to claim 4, it is characterised in that further include data
Memory, data storage are connect with ARM module.
9. anti-DC component current transformer error tester, feature described according to claim 1 or 2 or 3 or 6 or 8 exist
In being additionally provided with radiation panel, radiation panel is fixedly mounted on and the first half-wave current sampling resistor and the sampling of the second half-wave current
On the metal base plate of the corresponding housing bottom of resistance position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820561763.7U CN208207186U (en) | 2018-04-19 | 2018-04-19 | Anti- DC component current transformer error tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820561763.7U CN208207186U (en) | 2018-04-19 | 2018-04-19 | Anti- DC component current transformer error tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208207186U true CN208207186U (en) | 2018-12-07 |
Family
ID=64523573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820561763.7U Active CN208207186U (en) | 2018-04-19 | 2018-04-19 | Anti- DC component current transformer error tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208207186U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279396A (en) * | 2018-04-19 | 2018-07-13 | 南京丹迪克电力仪表有限公司 | Anti- DC component current transformer error tester and its test method |
| CN110133563A (en) * | 2019-05-13 | 2019-08-16 | 国网江西省电力有限公司电力科学研究院 | A kind of anti-DC performance detection method and device of current sensor |
-
2018
- 2018-04-19 CN CN201820561763.7U patent/CN208207186U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279396A (en) * | 2018-04-19 | 2018-07-13 | 南京丹迪克电力仪表有限公司 | Anti- DC component current transformer error tester and its test method |
| CN110133563A (en) * | 2019-05-13 | 2019-08-16 | 国网江西省电力有限公司电力科学研究院 | A kind of anti-DC performance detection method and device of current sensor |
| CN110133563B (en) * | 2019-05-13 | 2021-10-19 | 国网江西省电力有限公司电力科学研究院 | Method and device for detecting direct current resistance of current sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108279396A (en) | Anti- DC component current transformer error tester and its test method | |
| CN201444193U (en) | Comprehensive error detection device used for digital electric energy measuring device | |
| CN103149546B (en) | The field integrated tester of a kind of portable electric energy measuring terminal | |
| CN103018703B (en) | Current/voltage conversion traceability method for precision alternating current measurement | |
| CN105116369A (en) | Radio frequency radiation disturbance rejection degree test apparatus and system | |
| CN106405470A (en) | Overall detection method and apparatus for harmonic accuracy of electronic current transformer | |
| CN208207186U (en) | Anti- DC component current transformer error tester | |
| CN106546938A (en) | A kind of anti-DC component of current transformer and test even system | |
| CN208818818U (en) | A kind of low-power consumption program control type current mutual inductor field detecting device | |
| CN207318694U (en) | A kind of non-contact type current instrument on-line calibration device | |
| CN104931914A (en) | Analog field high voltage energy meter calibration system | |
| CN106483397B (en) | A kind of electric energy quality detection device and measurement method of high-precision high bandwidth | |
| CN201757779U (en) | Electronic transformer calibrator | |
| CN209182394U (en) | A kind of non-contact type current signal supervisory instrument | |
| CN209400684U (en) | A kind of voltage transformer wideband error measuring system | |
| CN103344937B (en) | Intelligent electric energy meter consumption detection equipment and detection method | |
| CN109541516A (en) | A kind of voltage transformer wideband error measurement method | |
| CN106990381B (en) | Mutual inductor magnetic saturation detection device | |
| CN102608423B (en) | Detection method of harmonic energy | |
| CN2427816Y (en) | Instrument for measuring and calibrating electricity meter testing device | |
| CN203551762U (en) | Electronic instrument transformer and merging unit verification system | |
| CN205594091U (en) | Error measurement device for current transformer | |
| CN205539435U (en) | On --spot check gauge of multi -functional electric energy meter | |
| CN206132972U (en) | Electronic transformer and traditional mutual -inductor measurement characteristic contrastive analysis system | |
| CN208969163U (en) | Electric energy metering device and electrical energy measurement processing module, the electrical parameter detection circuit of voltage detecting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200709 Address after: No. 18 Qixia Xianlin Avenue horses Street District of Nanjing City, Jiangsu province 210046 Patentee after: Nanjing Jiazhi Feixun Technology Co., Ltd Address before: 210049 Golden Road 5, Zhongshan Science Park, Zhongshan gate, Qixia District, Nanjing, Jiangsu Patentee before: NANJING DANDICK ELECTRIC INSTRUMENT Co.,Ltd. |
|
| TR01 | Transfer of patent right |