CN107422204A - A kind of electric power network transmits power quality detection system - Google Patents
A kind of electric power network transmits power quality detection system Download PDFInfo
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- CN107422204A CN107422204A CN201710560349.4A CN201710560349A CN107422204A CN 107422204 A CN107422204 A CN 107422204A CN 201710560349 A CN201710560349 A CN 201710560349A CN 107422204 A CN107422204 A CN 107422204A
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- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 238000005070 sampling Methods 0.000 claims abstract description 15
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- 238000004804 winding Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000008358 core component Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000006870 function Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 5
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- 238000010276 construction Methods 0.000 abstract description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention discloses a kind of electric power network transmission power quality detection system, including voltage sampling circuit, voltage detecting circuit, frequency detection circuit, ups power, display screen, LED light, memory, timer and single-chip computer control system；The voltage sampling circuit will be respectively fed to voltage detecting circuit and frequency detection circuit after the voltage signal acquisition of input voltage, voltage detecting circuit connects single-chip computer control system with the signal output part of frequency detection circuit.Electric power network transmission power quality detection system of the present invention is detected by current detecting, voltage detecting and frequency detecting two ways to multiple signals of power supply respectively, and signal transacting is carried out by PIC single chip microcomputer, result is intuitively fed back into user by way of display screen and LED light, user is helped to understand power supply information in time, to take effective treatment measures, the system has the advantages of simple in construction, accurate testing and practical function.
Description
Technical field
The present invention relates to a kind of detecting system, specifically a kind of accurate testing, the electric power network transmission electric energy of superior performance
Quality detecting system.
Background technology
Power system by power plant, send and become electric line, the electrical energy production that is formed for links such as distribution substation and electricity consumptions and consumption
System.Its function is that the primary energy of nature is changed into electric energy by generation power device, then through transmission of electricity, power transformation and is matched somebody with somebody
Electricity supplies power to each user.To realize this function, power system also has corresponding in links and different levels
Information and control system, the production process of electric energy is measured, adjusted, controlled, protect, communicates and dispatched, to ensure user
Obtain safety, high-quality electric energy.
The quality of power system conveying electric energy is directly connected to the behaviour in service with electric loading, its voltage, the height of frequency
Directly determine the service life of load, it is therefore desirable to which fixed point monitoring controls.
The content of the invention
It is an object of the invention to provide a kind of electric power network of accurate testing, superior performance transmission Power Quality Detection system
System, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of electric power network transmits power quality detection system, including the inspection of voltage sampling circuit, voltage detecting circuit, frequency
Slowdown monitoring circuit, ups power, display screen, LED light, memory, current detection circuit, timer and single-chip computer control system；Institute
Current detection circuit, voltage detecting circuit and frequency will be respectively fed to after the voltage signal acquisition of input voltage by stating voltage sampling circuit
Rate detects circuit, and current detection circuit, voltage detecting circuit and the signal output part of frequency detection circuit connect single-chip microcomputer control
System, the single-chip computer control system are also respectively connected with ups power, display screen, LED light, memory and timer；
The voltage detecting circuit includes transformer W, potentiometer RP1, electric capacity C1 and chip IC 1, transformer W winding L1
Connect the output signal V-in of voltage sampling circuit, a transformer W winding L2 one end connection potentiometer RP1 fixation
End, transformer W winding L2 other end connection potentiometer RP1 another fixing end and electric capacity C1, the electric capacity C1 other end
Connect resistance R1, resistance R2 and resistance R3, resistance the R1 other end connection potentiometer RP1 sliding end, the resistance R3 other end
Connect 1 pin of electric capacity C2 and chip IC 1, the resistance R2 other end connection electric capacity C2 other end, 3 pins of chip IC 1 and
Single-chip microcomputer control centre, the 2 pins connection potentiometer RP2 of chip IC 1 sliding end, potentiometer RP2 fixing end connection
Resistance R4, electric capacity C3 and diode D1 negative electrode, potentiometer RP1 another fixing end connection electric capacity C3 other end and two poles
Pipe D1 anode, resistance R4 other end connection power supply VCC；
The frequency detection circuit is crossed including rectifier bridge T, diode D2 and connected with triode VT1, rectifier bridge T 1 port
The output signal V-in of voltage sampling circuit, rectifier bridge T 2 ports connection resistance R5 and diode D2 anode, rectifier bridge T's
3 ports are grounded, rectifier bridge T 4 ports connection resistance R6, electric capacity C4, electric capacity C5 and triode VT1 emitter stage and ground connection, and two
The pole pipe D2 negative electrode connection electric capacity C4 other end, the resistance R5 other end connection resistance R6 other end, electric capacity C5 it is another
End and triode VT1 base stage, triode VT1 colelctor electrode connection resistance R7 and single-chip microcomputer control centre, resistance R7's is another
End connection power supply VCC.
Preferred scheme as the present invention：The single-chip microcomputer control centre is the control using PIC18F458 as main core component
Unit processed.
Preferred scheme as the present invention：The display screen is LCD display.
Preferred scheme as the present invention：The LED light includes green light LED and red-light LED.
Preferred scheme as the present invention：The power supply VCC is 5V direct currents.
Preferred scheme as the present invention：The core parts of the current detection module are MAX9937 current detecting chips.
Preferred scheme as the present invention：The display screen is touch LCD screen.
Compared with prior art, the beneficial effects of the invention are as follows：Electric power network of the present invention transmits power quality detection system
Multiple signals of power supply are detected by current detecting, voltage detecting and frequency detecting two ways respectively, and
Signal transacting is carried out by PIC single chip microcomputer, result is intuitively fed back into use by way of display screen and LED light
Person, user is helped to understand power supply information in time, to take effective treatment measures, the system has simple in construction, test essence
The advantages of accurate and practical function.
Brief description of the drawings
Fig. 1 is the structured flowchart that electric power network transmits power quality detection system；
Fig. 2 is the circuit diagram of voltage detecting circuit；
Fig. 3 is the circuit diagram of frequency detection circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1~3 are referred to, a kind of electric power network transmits power quality detection system, including the inspection of voltage sampling circuit, voltage
Slowdown monitoring circuit, frequency detection circuit, ups power, display screen, LED light, memory, current detection circuit, timer and monolithic
Machine control system；The voltage sampling circuit will be respectively fed to current detection circuit, electricity after the voltage signal acquisition of input voltage
Pressure detection circuit and frequency detection circuit, the signal output part of current detection circuit, voltage detecting circuit and frequency detection circuit
Single-chip computer control system is connected, the single-chip computer control system is also respectively connected with ups power, display screen, LED light, storage
Device and timer；
The voltage detecting circuit includes transformer W, potentiometer RP1, electric capacity C1 and chip IC 1, transformer W winding L1
Connect the output signal V-in of voltage sampling circuit, a transformer W winding L2 one end connection potentiometer RP1 fixation
End, transformer W winding L2 other end connection potentiometer RP1 another fixing end and electric capacity C1, the electric capacity C1 other end
Connect resistance R1, resistance R2 and resistance R3, resistance the R1 other end connection potentiometer RP1 sliding end, the resistance R3 other end
Connect 1 pin of electric capacity C2 and chip IC 1, the resistance R2 other end connection electric capacity C2 other end, 3 pins of chip IC 1 and
Single-chip microcomputer control centre, the 2 pins connection potentiometer RP2 of chip IC 1 sliding end, potentiometer RP2 fixing end connection
Resistance R4, electric capacity C3 and diode D1 negative electrode, potentiometer RP1 another fixing end connection electric capacity C3 other end and two poles
Pipe D1 anode, resistance R4 other end connection power supply VCC；
The frequency detection circuit is crossed including rectifier bridge T, diode D2 and connected with triode VT1, rectifier bridge T 1 port
The output signal V-in of voltage sampling circuit, rectifier bridge T 2 ports connection resistance R5 and diode D2 anode, rectifier bridge T's
3 ports are grounded, rectifier bridge T 4 ports connection resistance R6, electric capacity C4, electric capacity C5 and triode VT1 emitter stage and ground connection, and two
The pole pipe D2 negative electrode connection electric capacity C4 other end, the resistance R5 other end connection resistance R6 other end, electric capacity C5 it is another
End and triode VT1 base stage, triode VT1 colelctor electrode connection resistance R7 and single-chip microcomputer control centre, resistance R7's is another
End connection power supply VCC.
Single-chip microcomputer control centre is the control unit using PIC18F458 as main core component.Display screen is LCD display.
LED light includes green light LED and red-light LED.Power supply VCC is 5V direct currents.The core parts of current detection module are
MAX9937 current detecting chips.Display screen is touch LCD screen.
The present invention operation principle be：Input voltage includes internal combustion engine generator and line voltage, and voltage sampling circuit will be adopted
The voltage signal collected is respectively fed to voltage detecting circuit and frequency detection circuit, and voltage detecting circuit mainly passes through MAX9937
Current detecting chip is that the electric current of input is detected in real time, and voltage detecting circuit is mainly the exchange to input voltage input
Voltage is detected in real time, input voltage voltage signal V-in after transformer W pick-ups, then via potentiometer RP1, resistance R2,
Single-chip computer control system is sent into after the voltage lifting circuit that electric capacity C1, resistance R3 and chip IC 1 form, is adopted in voltage lifting circuit
With unlimited gain second-order low-pass filter, ac voltage signal can be translated up, can also filter out high-frequency interferencing signal, prevent from handing over
Flow aliasing effect during signal sampling.The stability of circuit is added, frequency detection circuit is mainly to line voltage and internal combustion
The electric voltage frequency of generator output is detected, after the voltage signal V-in that dual power supply equipment exports is rectified, in figure 3
A at produce fixed frequency (wherein line voltage is about 100HZ, and internal combustion engine generator is different according to model difference output frequency)
Half-wave voltage signal, access triode VT1 is amplified after resistance R5 and resistance R6 partial pressures, and zero-crossing pulse is produced at b.By changing
Become resistance R1 and resistance R2 ratio, can adjust the width of zero-crossing pulse at b.Therefore the midpoint of obtained zero-crossing pulse is exchange
The real zero crossing of electricity.To obtain the time corresponding to pulse center point, using PIC seizure rising edge, its time of origin is write down, tightly
Then subsequent pulse falling edge is caught, both time differences are pulse width, and the 1/2 of its value is pulse center point.Using
Such catching mode can be accurately obtained the actual zero crossing of alternating voltage, and single-chip computer control system is according to the frequency detected
Value judgement is that power supply is working, and is then exported the result of processing by LCD display and indicating circuit, circuit point
The output voltage of power supply is not detected by voltage detecting and frequency detecting two ways, and passes through PIC monolithics
Machine carries out signal transacting, and result is intuitively fed back into user by way of display screen and acousto-optic instruction, helps user
Power supply information is understood in time, and to take effective treatment measures, this circuit has simple in construction, accurate testing and practical function
Advantage.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the involved claim of limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (7)
1. a kind of electric power network transmits power quality detection system, including voltage sampling circuit, voltage detecting circuit, frequency detecting
Circuit, ups power, display screen, LED light, memory, current detection circuit, timer and single-chip computer control system；It is special
Sign is that the voltage sampling circuit will be respectively fed to current detection circuit, voltage inspection after the voltage signal acquisition of input voltage
Slowdown monitoring circuit and frequency detection circuit, current detection circuit, voltage detecting circuit connect with the signal output part of frequency detection circuit
Single-chip computer control system, the single-chip computer control system be also respectively connected with ups power, display screen, LED light, memory and
Timer.
The voltage detecting circuit includes transformer W, potentiometer RP1, electric capacity C1 and chip IC 1, transformer W winding L1 connections
The output signal V-in of voltage sampling circuit, transformer W winding L2 one end connection potentiometer RP1 a fixing end, become
Depressor W winding L2 other end connection potentiometer RP1 another fixing end and electric capacity C1, electric capacity C1 other end connection electricity
Hinder R1, resistance R2 and resistance R3, resistance the R1 other end connection potentiometer RP1 sliding end, resistance R3 other end connection electricity
Hold C2 and 1 pin of chip IC 1, the resistance R2 other end connection electric capacity C2 other end, 3 pins and single-chip microcomputer of chip IC 1
Control centre, the 2 pins connection potentiometer RP2 of chip IC 1 sliding end, potentiometer RP2 fixing end connection resistance R4,
Electric capacity C3 and diode D1 negative electrode, potentiometer RP1 another fixing end connection electric capacity C3 other end and diode D1's
Anode, resistance R4 other end connection power supply VCC, the chip IC 1 is LM358 type operational amplifiers；
The frequency detection circuit is crossed and triode VT1, rectifier bridge T 1 port connection voltage including rectifier bridge T, diode D2
The output signal V-in of sample circuit, rectifier bridge T 2 ports connection resistance R5 and diode D2 anode, rectifier bridge T 3 ends
Mouth ground connection, rectifier bridge T 4 ports connect resistance R6, electric capacity C4, electric capacity C5 and triode VT1 emitter stage and ground connection, diode
The D2 negative electrode connection electric capacity C4 other end, the resistance R5 other end connection resistance R6 other end, the electric capacity C5 other end and
Triode VT1 base stage, triode VT1 colelctor electrode connection resistance R7 and single-chip microcomputer control centre, the resistance R7 other end connect
Meet power supply VCC.
A kind of 2. electric power network transmission power quality detection system according to claim 1, it is characterised in that the monolithic
Machine control centre is the control unit using PIC18F458 as main core component.
A kind of 3. electric power network transmission power quality detection system according to claim 1, it is characterised in that the display
Shield for LCD display.
A kind of 4. electric power network transmission power quality detection system according to claim 1, it is characterised in that the LED
Indicator lamp includes green light LED and red-light LED.
A kind of 5. electric power network transmission power quality detection system according to claim 1, it is characterised in that the power supply
VCC is 5V direct currents.
A kind of 6. electric power network transmission power quality detection system according to claim 1, it is characterised in that the electric current
The core parts of detection module are MAX9937 current detecting chips.
A kind of 7. electric power network transmission power quality detection system according to claim 1, it is characterised in that the display
Shield for touch LCD screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710560349.4A CN107422204A (en) | 2017-07-01 | 2017-07-01 | A kind of electric power network transmits power quality detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710560349.4A CN107422204A (en) | 2017-07-01 | 2017-07-01 | A kind of electric power network transmits power quality detection system |
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| CN107422204A true CN107422204A (en) | 2017-12-01 |
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| CN201710560349.4A Pending CN107422204A (en) | 2017-07-01 | 2017-07-01 | A kind of electric power network transmits power quality detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541355A (en) * | 2018-12-12 | 2019-03-29 | 许昌学院 | A kind of power quality monitoring system for intelligent power grid |
| CN110275453A (en) * | 2018-01-30 | 2019-09-24 | 国网山东省电力公司日照供电公司 | A kind of low-voltage network power quality controlling device general purpose controller |
-
2017
- 2017-07-01 CN CN201710560349.4A patent/CN107422204A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110275453A (en) * | 2018-01-30 | 2019-09-24 | 国网山东省电力公司日照供电公司 | A kind of low-voltage network power quality controlling device general purpose controller |
| CN109541355A (en) * | 2018-12-12 | 2019-03-29 | 许昌学院 | A kind of power quality monitoring system for intelligent power grid |
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Application publication date: 20171201 |