CN108872782A - A kind of mains by harmonics on-line measuring device and method - Google Patents
A kind of mains by harmonics on-line measuring device and method Download PDFInfo
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- CN108872782A CN108872782A CN201810476596.0A CN201810476596A CN108872782A CN 108872782 A CN108872782 A CN 108872782A CN 201810476596 A CN201810476596 A CN 201810476596A CN 108872782 A CN108872782 A CN 108872782A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R23/16—Spectrum analysis; Fourier analysis
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- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of mains by harmonics on-line measuring device and methods,Including detecting host,It detects host side and is equipped with signal acquisition interface,It detects host front end face and is equipped with display screen,It detects and is equipped with core circuit plate inside host,Core circuit plate is equipped with arm processor,Voltage signal acquisition module,Current signal collection module,Signal conditioning module,Memory module and display module,Signal acquisition interface connects the voltage transformer and current transformer being mounted on power grid by signal wire respectively,Voltage transformer connects voltage signal acquisition module,Current transformer connects current signal collection module,Voltage signal acquisition module,Current signal collection module passes through signal conditioning module respectively and connects arm processor,Arm processor is separately connected memory module and display module,Structure of the invention principle is simple,It can be realized the real-time detection to mains by harmonics signal,Harmonic signal acquisition precision is high,Convenient for the judgement of technical staff.
Description
Technical field
The present invention relates to harmonic detecting technique field, specially a kind of mains by harmonics on-line measuring device and method.
Background technique
In recent years, with the access of various non-stationaries, nonlinear electrical device come into operation with distributed generation resource, power grid
In harmonic wave, m-Acetyl chlorophosphonazo type and content sharp increase, and then result in power quality and receive and seriously affect.Harmonic wave makes electric energy
Production, transmission and the efficiency that uses reduce and harm generated to the electromagnetic environment of surrounding.However, conventional electric power harmonic detecting is general
Store-through is low in harmonic wave discrimination, the low drawback of monitoring efficiency, therefore, it is necessary to improve.
Summary of the invention
The purpose of the present invention is to provide a kind of mains by harmonics on-line measuring device and methods, to solve above-mentioned background technique
The problem of middle proposition.
To achieve the above object, the present invention provides the following technical solutions：A kind of mains by harmonics on-line measuring device, including inspection
Host is surveyed, the detection host side is equipped with signal acquisition interface, and the detection host front end face is equipped with display screen, the detection
Core circuit plate is equipped with inside host, the core circuit plate is equipped with arm processor, voltage signal acquisition module, electric current letter
Number acquisition module, signal conditioning module, memory module and display module, the signal acquisition interface pass through signal wire respectively and connect
The voltage transformer and current transformer being mounted on power grid, the voltage transformer connects voltage signal acquisition module, described
Current transformer connects current signal collection module, and the voltage signal acquisition module, current signal collection module pass through respectively
Signal conditioning module connects arm processor, and the arm processor is separately connected memory module and display module.
Preferably, the current signal collection module includes operational amplifier A, diode A and diode B, the operation
Amplifier A electrode input end connects the one end resistance A, and negative input is separately connected the one end resistance B and the one end resistance D, and resistance A is another
One end is separately connected the one end resistance C and current transformer interface, resistance C other end ground connection, and the resistance B other end is grounded, and resistance D is another
One end connects operational amplifier A output end, and the operational amplifier A output end is separately connected diode A anode and diode B is negative
Pole, the diode A cathode connect power end, the diode B plus earth.
Preferably, the voltage signal acquisition module includes operational amplifier B, diode C and diode D, the operation
Amplifier B electrode input end is separately connected the one end resistance H, the one end resistance E, and negative input is separately connected the one end resistance F and electricity
The one end G is hindered, the resistance E other end is separately connected the one end resistance I and the one end resistance J, another termination power end of resistance I, resistance J
Other end ground connection, the resistance H other end ground connection, another termination operational amplifier B output end of resistance G, the operation are put
Big device B output end is separately connected diode C anode and diode D cathode, and the diode C cathode connects power end, and diode D is just
Pole ground connection.
Preferably, the signal conditioning module includes operational amplifier A, operational amplifier B, adjustable resistance A and adjustable electric
B is hindered, adjustable resistance A, the adjustable resistance A sliding end connection anode electricity are connected between mono- foot of operational amplifier A and octal
Source, bis- foot of operational amplifier A are separately connected the one end resistance L and the one end resistance K, and three feet are grounded by resistance M, and four feet connect
Negative electricity source is connect, six feet are separately connected the one end resistance N and the resistance K other end；Bis- foot of operational amplifier B is separately connected electricity
The N other end and the one end resistance O are hindered, three feet connect the one end resistance P, and four feet connect negative electricity source, connect between a foot and octal
Adjustable resistance B, the adjustable resistance B sliding end connect cathode power supply end, and six foot of operational amplifier B is separately connected resistance Q
One end and the resistance O other end.
Preferably, detection method includes the following steps：
A, voltage transformer and current transformer detect the voltage and current signals at power grid end respectively；
B, the voltage and current signals of detection pass through voltage signal acquisition module, current signal collection module acquisition respectively；
C, the signal of acquisition is improved by signal conditioning module, carries out filtering miscellaneous denoising；
D, treated, and signal shows harmonic signal after arm processor is handled on a display screen.
Compared with prior art, the beneficial effects of the invention are as follows：
（1）Structure of the invention principle is simple, can be realized the real-time detection to mains by harmonics signal, harmonic signal acquisition precision
Height, convenient for the judgement of technical staff.
（2）The current signal collection module that the present invention uses can be realized high-precision data acquisition；And structure is simple, holds
It easily realizes, stable output signal；The voltage signal acquisition module strong antijamming capability of use, collecting efficiency is high, and transmission speed is fast.
（3）The signal conditioning module that the present invention uses effectively reduces noise jamming, reduces output impedance, improves signal acquisition
Precision.
Detailed description of the invention
Fig. 1 is overall structure of the present invention；
Fig. 2 is control principle block diagram of the invention；
Fig. 3 is current signal collection module schematic diagram of the invention；
Fig. 4 is voltage signal acquisition module principle figure of the invention；
Fig. 5 is signal conditioning module schematic diagram of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-5 is please referred to, the present invention provides a kind of technical solution：A kind of mains by harmonics on-line measuring device, including detection
Host 1,1 side of detection host are equipped with signal acquisition interface 2, and 1 front end face of detection host is equipped with display screen 3, described
It detects and is equipped with core circuit plate 4 inside host 1, the core circuit plate 4 is equipped with arm processor 5, voltage signal acquisition module
6, current signal collection module 7, signal conditioning module 8, memory module 9 and display module 10, the signal acquisition interface 2 are distinguished
The voltage transformer 11 and current transformer 12 that are mounted on power grid are connected by signal wire, the voltage transformer 11 connects electricity
Pressure signal acquisition module 6, the connection of current transformer 12 current signal collection module 7, the voltage signal acquisition module 6,
Current signal collection module 7 connects arm processor 5 by signal conditioning module 8 respectively, and the arm processor 5, which is separately connected, to be deposited
Store up module 9 and display module 10.
In the present invention, current signal collection module 7 includes operational amplifier A1c, diode A1b and diode B2b, described
Operational amplifier A1c electrode input end connects the one end resistance A1a, and negative input is separately connected the one end resistance B2a and resistance D4a
One end, the resistance A1a other end are separately connected the one end resistance C3a and current transformer interface, resistance C3a other end ground connection, resistance
B2a other end ground connection, the resistance D4a other end connect operational amplifier A1c output end, the operational amplifier A1c output end point
Not Lian Jie diode A1b anode and diode B2b cathode, the diode A1b cathode connects power end, and the diode B2b is just
Pole ground connection.
In the present invention, voltage signal acquisition module 6 includes operational amplifier B2c, diode C3b and diode D4b, described
Operational amplifier B2c electrode input end is separately connected the one end resistance H8a, the one end resistance E5a, and negative input is separately connected resistance
The one end F6a and the one end resistance G7a, the resistance E5a other end are separately connected the one end resistance I9a and the one end resistance J10a, resistance
Another termination power end of I9a, resistance J10a other end ground connection, the resistance H8a other end ground connection, the resistance G7a other end
Operational amplifier B2c output end is connect, the operational amplifier B2c output end is separately connected diode C3b anode and diode D4b
Cathode, the diode C3b cathode connect power end, diode D4b plus earth.
The current signal collection module that the present invention uses can be realized high-precision data acquisition；And structure is simple, is easy
It realizes, stable output signal；The voltage signal acquisition module strong antijamming capability of use, collecting efficiency is high, and transmission speed is fast.
In the present invention, signal conditioning module 8 includes operational amplifier A1d, operational amplifier B2d, adjustable resistance A1e and can
Resistance B2e is adjusted, adjustable resistance A1e, the adjustable resistance A1e sliding are connected between mono- foot of operational amplifier A1d and octal
End connection cathode power supply end, bis- foot of operational amplifier A1d are separately connected the one end resistance L12a and the one end resistance K11a, three feet
It is grounded by resistance M13a, four feet connect negative electricity source, and six feet are separately connected the one end resistance N14a and the resistance K11a other end；
Bis- foot of operational amplifier B2d is separately connected the resistance N14a other end and the one end resistance O15a, and three feet connect resistance P16a mono-
End, four feet connect negative electricity source, and adjustable resistance B2e, the adjustable resistance B2e sliding end connection are connected between a foot and octal
Cathode power supply end, six foot of operational amplifier B2d are separately connected the one end resistance Q17a and the resistance O15a other end.The present invention adopts
Signal conditioning module effectively reduces noise jamming, reduces output impedance, improves signal acquisition precision.
Detection method of the invention includes the following steps：
A, voltage transformer and current transformer detect the voltage and current signals at power grid end respectively；
B, the voltage and current signals of detection pass through voltage signal acquisition module, current signal collection module acquisition respectively；
C, the signal of acquisition is improved by signal conditioning module, carries out filtering miscellaneous denoising；
D, treated, and signal shows harmonic signal after arm processor is handled on a display screen.
In conclusion structure of the invention principle is simple, the real-time detection to mains by harmonics signal, harmonic signal can be realized
Acquisition precision is high, convenient for the judgement of technical staff.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of mains by harmonics on-line measuring device, including detection host（1）, it is characterised in that：The detection host（1）Side
Equipped with signal acquisition interface（2）, the detection host（1）Front end face is equipped with display screen（3）, the detection host（1）Inside is set
There is core circuit plate（4）, the core circuit plate（4）It is equipped with arm processor（5）, voltage signal acquisition module（6）, electric current
Signal acquisition module（7）, signal conditioning module（8）, memory module（9）And display module（10）, the signal acquisition interface（2）
The voltage transformer being mounted on power grid is connected by signal wire respectively（11）And current transformer（12）, the voltage transformer
（11）Connect voltage signal acquisition module（6）, the current transformer（12）Connect current signal collection module（7）, the electricity
Press signal acquisition module（6）, current signal collection module（7）Pass through signal conditioning module respectively（8）Connect arm processor（5）,
The arm processor（5）It is separately connected memory module（9）And display module（10）.
2. a kind of mains by harmonics on-line measuring device according to claim 1, it is characterised in that：The current signal acquisition
Module（7）Including operational amplifier A (1c), diode A (1b) and diode B (2b), operational amplifier A (1c) anode is defeated
Enter end connection one end resistance A (1a), negative input is separately connected the one end (2a) resistance B and the one end resistance D (4a), resistance A
(1a) other end is separately connected the one end (3a) resistance C and current transformer interface, resistance C (3a) other end ground connection, resistance B (2a)
Other end ground connection, resistance D (4a) other end connect operational amplifier A (1c) output end, operational amplifier A (1c) output end
It is separately connected diode A (1b) anode and diode B (2b) cathode, diode A (1b) cathode connects power end, two pole
Pipe B (2b) plus earth.
3. a kind of mains by harmonics on-line measuring device according to claim 1, it is characterised in that：The voltage signal acquisition
Module（6）Including operational amplifier B (2c), diode C (3b) and diode D (4b), operational amplifier B (2c) anode is defeated
Enter end and be separately connected the one end resistance H (8a), the one end resistance E (5a), negative input is separately connected the one end (6a) resistance F and resistance
The one end G (7a), resistance E (5a) other end are separately connected the one end (9a) resistance I and the one end resistance J (10a), resistance I (9a)
Another termination power end, resistance J (10a) other end ground connection, resistance H (8a) other end ground connection, the resistance G (7a) are another
Terminate operational amplifier B (2c) output end, operational amplifier B (2c) output end be separately connected diode C (3b) anode and
Diode D (4b) cathode, diode C (3b) cathode connect power end, diode D (4b) plus earth.
4. a kind of mains by harmonics on-line measuring device according to claim 1, it is characterised in that:The signal conditioning module
（8）Including operational amplifier A (1d), operational amplifier B (2d), adjustable resistance A (1e) and adjustable resistance B (2e), the operation
Adjustable resistance A (1e) is connected between amplifier A (1d) foot and octal, adjustable resistance A (1e) the sliding end connection anode electricity
Source, two foot of operational amplifier A (1d) are separately connected the one end (12a) resistance L and the one end resistance K (11a), and three feet pass through electricity
M (13a) ground connection is hindered, four feet connect negative electricity source, and six feet are separately connected the one end (14a) resistance N and resistance K (11a) other end；
Two foot of operational amplifier B (2d) is separately connected resistance N (14a) other end and the one end resistance O (15a), and three feet connect resistance P
The one end (16a), four feet connect negative electricity source, connect adjustable resistance B (2e) between a foot and octal, the adjustable resistance B
(2e) sliding end connects cathode power supply end, and six foot of operational amplifier B (2d) is separately connected the one end (17a) resistance Q and resistance O
(15a) other end.
5. realizing a kind of detection method of mains by harmonics on-line measuring device described in claim 1, it is characterised in that:Detection side
Method includes the following steps：
A, voltage transformer and current transformer detect the voltage and current signals at power grid end respectively；
B, the voltage and current signals of detection pass through voltage signal acquisition module, current signal collection module acquisition respectively；
C, the signal of acquisition is improved by signal conditioning module, carries out filtering miscellaneous denoising；
D, treated, and signal shows harmonic signal after arm processor is handled on a display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810476596.0A CN108872782A (en) | 2018-05-18 | 2018-05-18 | A kind of mains by harmonics on-line measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810476596.0A CN108872782A (en) | 2018-05-18 | 2018-05-18 | A kind of mains by harmonics on-line measuring device and method |
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| Publication Number | Publication Date |
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| CN108872782A true CN108872782A (en) | 2018-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810476596.0A Pending CN108872782A (en) | 2018-05-18 | 2018-05-18 | A kind of mains by harmonics on-line measuring device and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221643A (en) * | 2011-06-14 | 2011-10-19 | 中国矿业大学 | Converter harmonic detector of direct current mine hoist |
| CN203133168U (en) * | 2012-12-14 | 2013-08-14 | 浙江师范大学 | Power harmonic detector |
| CN103837801A (en) * | 2014-03-26 | 2014-06-04 | 国家电网公司 | Power distribution network fault locating system and method |
| CN106208094A (en) * | 2016-07-07 | 2016-12-07 | 安徽众升电力科技有限公司 | A kind of reactive power compensator signal pickup assembly |
| CN205898949U (en) * | 2016-06-15 | 2017-01-18 | 中科泰和绿色能源（广州）有限公司 | Join in marriage quick detection device of power system fault |
-
2018
- 2018-05-18 CN CN201810476596.0A patent/CN108872782A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221643A (en) * | 2011-06-14 | 2011-10-19 | 中国矿业大学 | Converter harmonic detector of direct current mine hoist |
| CN203133168U (en) * | 2012-12-14 | 2013-08-14 | 浙江师范大学 | Power harmonic detector |
| CN103837801A (en) * | 2014-03-26 | 2014-06-04 | 国家电网公司 | Power distribution network fault locating system and method |
| CN205898949U (en) * | 2016-06-15 | 2017-01-18 | 中科泰和绿色能源（广州）有限公司 | Join in marriage quick detection device of power system fault |
| CN106208094A (en) * | 2016-07-07 | 2016-12-07 | 安徽众升电力科技有限公司 | A kind of reactive power compensator signal pickup assembly |
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Application publication date: 20181123 |
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