CN206710508U - A kind of harmonic measurement device - Google Patents
A kind of harmonic measurement device Download PDFInfo
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- CN206710508U CN206710508U CN201720406856.8U CN201720406856U CN206710508U CN 206710508 U CN206710508 U CN 206710508U CN 201720406856 U CN201720406856 U CN 201720406856U CN 206710508 U CN206710508 U CN 206710508U
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- electric power
- microcontroller
- detection unit
- power detection
- measurement device
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Abstract
A kind of harmonic measurement device, its structure are：Three-phase current from power network after current transformer, current-to-voltage convertor harmonic and protection circuit I, is separately input to electric power detection unit successively；Three-phase voltage from power network is successively by resistance pressure-dividing network and filtering with after protection circuit I, being separately input to electric power detection unit；Microcontroller is connected between electric power detection unit and communication unit, and communication unit is uploaded data by bus；A items voltage in three-phase voltage is exported into microcontroller after light-coupled isolation unit, and microcontroller analyzes and processes to the signal received.The utility model solves the problems, such as mains by harmonics measurement while conventional electrical measurement is realized, significantly reduces the hardware cost of instrument again, and safety and stability are good.
Description
Technical field
A kind of harmonic measurement device is the utility model is related to, belongs to detection of electrons field.
Background technology
Mains by harmonics is measurement parameter more important in electric power electric measuring instrument.When the ring that may change in face of mains frequency
During border, the technology path big city of in general synchronized sampling combination Fast Fourier Transform (FFT) cause hardware complication and instrument into
This raising.How on the premise of effective value, active reactive and electric energy measurement is completed, pass through less cost generation
Valency realizes the measurement function of mains by harmonics, while can preferably adapt to the power grid environment of frequency change, is electric power electric measuring instrument
One big difficult point of design.
The content of the invention
In order to solve the above-mentioned technical problem, the utility model provides a kind of harmonic measurement device, and three-phase current passes through respectively
Current signal is converted to by voltage signal by Low Drift Temperature precision resistance after overcurrent transformer, after filtering after protection circuit with
The current channel of electric power detection unit is connected, and three-phase voltage is examined by resistance pressure-dividing network and filter protective circuit with electricity respectively
The voltage channel for surveying unit is connected, while high AC voltage is converted into action of low-voltage pulse by A phase voltages after light-coupled isolation unit
Signal, export to microcontroller and be used for grid frequency measurement, microcontroller is connected by its GPIO with electric power detection unit, micro-control
Device processed is transferred signals in host computer by RS-485 communication units.While conventional electrical measurement is realized, solves electricity
The problem of net harmonic measure, the hardware cost of instrument is significantly reduced again.
To achieve these goals, the technical solution adopted in the utility model is：A kind of harmonic measurement device, its feature exist
In：Three-phase current from power network after current transformer, current-to-voltage convertor harmonic and protection circuit I, divides successively
Electric power detection unit is not input to；Three-phase voltage from power network is successively by resistance pressure-dividing network and filtering and protection circuit I
Afterwards, it is separately input to electric power detection unit；Microcontroller is connected between electric power detection unit and communication unit, and communication unit leads to
Bus is crossed to upload data；A items voltage in three-phase voltage is exported into microcontroller, micro-control after light-coupled isolation unit
Device processed analyzes and processes to the signal received.
The GPIO interface of described microcontroller is connected with the SPI interface pin of electric power detection unit, the letter of microcontroller
Number it is output to by UAPT interfaces in communication unit, information unit is output to host computer by communication unit by RS-485 buses
In.
Described light-coupled isolation unit is made up of TLP180 and external circuit, and light-coupled isolation unit is converted to alternating voltage
Output is into microcontroller after low voltage pulse signal.
Described electric power detection unit is made up of ATT7022C and its external circuit.
Described microcontroller is made up of MSP430F47166 chips and its external circuit.
Described current-to-voltage convertor is specially Low Drift Temperature precision resistance.
Described protection circuit I forms with filtering with protection circuit I by three groups of diodes, includes in every group of diode
Four diode original papers, after each two diode output parallel connection, it is connected on electric power detection unit.
The beneficial effects of the utility model are：
Current signal is first converted to voltage signal, afterwards by filtering protection electricity by the utility model by said structure
After road carries out insulation blocking, then after carrying out electric power detection harmony wave measurement, transmit the result in host computer, use light-coupled isolation
Alternating voltage is converted to low voltage pulse signal by unit, be instead of traditional pulses switch unit, is greatly reduced hardware cost.
The utility model solves the problems, such as mains by harmonics measurement, significantly reduces instrument again while conventional electrical measurement is realized
Hardware cost, and safety and stability are good.
Brief description of the drawings
Fig. 1：For the utility model block diagram.
Fig. 2：For the utility model partial schematic.
Fig. 3：For micro controller unit schematic diagram in Fig. 1.
Fig. 4：For communication unit schematic diagram in Fig. 1.
Fig. 5：For electric power detection unit schematic diagram in Fig. 1.
Embodiment
A kind of harmonic measurement device, its structure are：Three-phase current from power network is successively by current transformer 1, electric current
The harmonic of electric pressure converter 2 is with after protection circuit I3, being separately input to electric power detection unit 4；Three-phase voltage from power network according to
It is secondary by resistance pressure-dividing network 6 and filtering with protection circuit I7 after, be separately input to electric power detection unit 4；Microcontroller 5 connects
Between electric power detection unit 4 and communication unit 9, communication unit 9 is uploaded data by bus；A items electricity in three-phase voltage
Pressure is exported into microcontroller 5, microcontroller 5 analyzes and processes to the signal received after light-coupled isolation unit 8.
The GPIO interface of microcontroller 5 is connected with the SPI interface pin of electric power detection unit 4, and the signal of microcontroller is connect by UAPT
Mouth is output in communication unit 9, and information unit is output in host computer by communication unit 9 by RS-485 buses.
Described light-coupled isolation unit 8 is made up of TLP180 and external circuit, and light-coupled isolation unit 8 changes alternating voltage
It is that output is into microcontroller 5 after low voltage pulse signal, the utility model is using light-coupled isolation unit 8 instead of traditional pulse list
Member, while system safety and stability performance is ensured, effectively reduce hardware cost.
Described electric power detection unit 4 is made up of ATT7022C and its external circuit.
Described microcontroller 5 is made up of MSP430F47166 chips and its external circuit.
Described current-to-voltage convertor 2 is specially Low Drift Temperature precision resistance.
Described protection circuit I3 forms with filtering with protection circuit I7 by three groups of diodes, and every group of diode includes
There are four diode original papers, after each two diode output parallel connection, be connected on electric power detection unit 4.
During use：
Microcontroller 5 sets voltage or current channel to be measured by the SPI interface of electric power detection unit 4, periodically
Ground reads the sampled data in the upper RAM of electric power detection unit 4, and calculating presetting voltage or electric current with reference to frequency measurement leads to
The harmonic wave in road, measurement is recorded a demerit by RS-485 communication units using the UART interface on its piece and sent to host computer.
Described current transformer 1, its nonlinearity erron are 0.1%.
Described Low Drift Temperature precision resistance 2, its temperature drift coefficient is 10ppm, precision 0.1%.
Claims (7)
- A kind of 1. harmonic measurement device, it is characterised in that：Three-phase current from power network passes through current transformer successively（1）, electricity Flow electric pressure converter（2）Harmonic and protection circuit I（3）Afterwards, it is separately input to electric power detection unit（4）；Three from power network Phase voltage passes through resistance pressure-dividing network successively（6）With filtering and protection circuit I（7）Afterwards, it is separately input to electric power detection unit （4）；Microcontroller（5）It is connected to electric power detection unit（4）And communication unit（9）Between, communication unit（9）By bus by number According to upload；A items voltage in three-phase voltage passes through light-coupled isolation unit（8）Afterwards, export to microcontroller（5）In, microcontroller （5）The signal received is analyzed and processed.
- A kind of 2. harmonic measurement device according to claim 1, it is characterised in that：Described microcontroller（5）GPIO Interface and electric power detection unit（4）The connection of SPI interface pin, the signal of microcontroller is output to communication unit by UAPT interfaces Member（9）In, communication unit（9）Information unit is output in host computer by RS-485 buses.
- A kind of 3. harmonic measurement device according to claim 1, it is characterised in that：Described light-coupled isolation unit（8）By TLP180 and external circuit composition, light-coupled isolation unit（8）Exported after alternating voltage is converted into low voltage pulse signal to micro-control Device processed（5）In.
- A kind of 4. harmonic measurement device according to claim 1, it is characterised in that：Described electric power detection unit（4）By ATT7022C and its external circuit composition.
- A kind of 5. harmonic measurement device according to claim 1, it is characterised in that：Described microcontroller（5）By MSP430F47166 chips and its external circuit composition.
- A kind of 6. harmonic measurement device according to claim 1, it is characterised in that：Described current-to-voltage convertor（2） Specially Low Drift Temperature precision resistance.
- A kind of 7. harmonic measurement device according to claim 1, it is characterised in that：Described protection circuit I（3）With filtering With protection circuit I（7）Formed by three groups of diodes, include four diode original papers, the pole of each two two in every group of diode After pipe output end parallel connection, electric power detection unit is connected to（4）On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720406856.8U CN206710508U (en) | 2017-04-18 | 2017-04-18 | A kind of harmonic measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720406856.8U CN206710508U (en) | 2017-04-18 | 2017-04-18 | A kind of harmonic measurement device |
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| Publication Number | Publication Date |
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| CN206710508U true CN206710508U (en) | 2017-12-05 |
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| CN201720406856.8U Active CN206710508U (en) | 2017-04-18 | 2017-04-18 | A kind of harmonic measurement device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490628A (en) * | 2018-12-28 | 2019-03-19 | 钟祥博谦信息科技有限公司 | A kind of Measurement of Harmonics in Power System system |
-
2017
- 2017-04-18 CN CN201720406856.8U patent/CN206710508U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490628A (en) * | 2018-12-28 | 2019-03-19 | 钟祥博谦信息科技有限公司 | A kind of Measurement of Harmonics in Power System system |
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