CN206990685U - Measurement apparatus for High voltage power frequence electric field - Google Patents
Measurement apparatus for High voltage power frequence electric field Download PDFInfo
- Publication number
- CN206990685U CN206990685U CN201720668049.3U CN201720668049U CN206990685U CN 206990685 U CN206990685 U CN 206990685U CN 201720668049 U CN201720668049 U CN 201720668049U CN 206990685 U CN206990685 U CN 206990685U
- Authority
- CN
- China
- Prior art keywords
- resistance
- input
- electric field
- operational amplifier
- measurement apparatus
- 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 provides the measurement apparatus for High voltage power frequence electric field, belong to field of distribution network, including microcontroller, the output end of microcontroller is connected with indicating lamp module, the input of microcontroller and indicating lamp module is also associated with power module, and measurement apparatus also includes at least sensor signal processing module all the way for the input for being connected to microcontroller；Sensor signal processing module includes signal differential amplifying circuit.By sensor signal processing module during power frequency electric field measurement signal, useful signal is mainly extracted by signal differential amplifying circuit and amplify and suppression common mode interference signal, and then make measurement result accurately and reliably, raising measurement accuracy.
Description
Technical field
The utility model belongs to field of distribution network, the more particularly to measurement apparatus for High voltage power frequence electric field.
Background technology
Electric field measurement is widely used among the industries such as electric power, space flight, medical treatment.In recent years, as supergrid is complete
The gradual expansion of coverage rate, people are also increasingly paid close attention to this in the range of state.According to《State Grid Corporation of China's electric power safety work rule
Journey》The safe distance and the corresponding acoustooptic alarm system of configuration of various different voltage class are provided, and can be according to specific
It is required that adjustment alarm threshold value.
At present, in electromagnetic interference transformer station strongly, interference signal is too many when measuring electric field, so as to can be to measurement
Precision affects greatly.
Utility model content
In order to solve shortcoming and defect present in prior art, the utility model provides to be carried for High voltage power frequence electric field
The high measurement apparatus of measurement accuracy.
In order to reach above-mentioned technical purpose, the utility model provides the measurement apparatus for High voltage power frequence electric field, including
Microcontroller, the output end of the microcontroller are connected with indicating lamp module, the microcontroller and the indicating lamp module
Input is also associated with power module, the measurement apparatus also include the input for being connected to the microcontroller at least all the way
Sensor signal processing module；
Wherein, the sensor signal processing module includes signal differential amplifying circuit, the signal differential amplifying circuit
Including input resistance R7, one end of the input resistance R7 is as input, the other end concatenation operation of the input resistance R7
Amplifier U1 inverting input, connect amplifier resistance R2 between the inverting input and output end of the operational amplifier U1,
The input connection grounding resistance R16 of input resistance R7 one end, the other end ground connection of the grounding resistance R16 are described
The operational amplifier U1 grounded resistance R19 ground connection of in-phase input end, the output end connection output electricity of the operational amplifier U1
Hinder R12 one end.
Optionally, the sensor signal processing module also includes the output end for being connected to the signal differential amplifying circuit
Filter circuit.
Optionally, in the filter circuit：
Including operational amplifier U2, operational amplifier U3, input resistance R13, resistance R14, resistance R8, grounding resistance R20,
Amplifier resistance R4, ground capacity C35, ground capacity C36, filter capacitor C28；
The grounded electric capacity C35 connection output resistances R12 in one end of the input resistance R13 other end, the input electricity
Hinder in-phase input end of the R13 other end through resistance R14 concatenation operation amplifiers U2, one end connection of the filter capacitor C28
Input resistance R13 and resistance R14 common point, the other end concatenation operation amplifier U2's of the filter capacitor C28 is anti-phase defeated
Enter end；
The inverting input of the operational amplifier U2 is connected with itself output end, the same phase of the operational amplifier U2
The grounded electric capacity C36 ground connection of input, the output end connection resistance R8 of operational amplifier U2 one end, the resistance R8
Other end concatenation operation amplifier U3 inverting input, the inverting input and operational amplifier of the operational amplifier U3
Series connection amplifier resistance R4, the operational amplifier the U3 grounded resistance R20 of in-phase input end resistance connect between U3 output end
Ground.
Optionally, the sensor signal processing module also includes the input for being connected to the signal differential amplifying circuit
Sensor.
Optionally, the sensor is Archimedian spiral antenna.
Optionally, the level of the sensor signal processing module also output end including being connected to the filter circuit is inclined
Shift circuit.
Optionally, the level shift circuit includes A/D sampling A/D chips, the model AD7606- of the A/D sampling A/D chips
6。
Optionally, the model LPC1758 of the microcontroller.
The beneficial effect that technical scheme provided by the utility model is brought is：By sensor signal processing module in power frequency
During electric field measurement signal, mainly extracted useful signal by signal differential amplifying circuit and amplified and done with suppression common mode
Signal is disturbed, and then makes measurement result accurately and reliably, improves measurement accuracy.
Brief description of the drawings
It is required in being described below to embodiment to use in order to illustrate more clearly of the technical solution of the utility model
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the utility model, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is each unit connection diagram of the measurement apparatus provided by the utility model for High voltage power frequence electric field；
Fig. 2 is the circuit connection diagram of signal differential amplifying circuit provided by the utility model；
Fig. 3 is the circuit connection diagram of filter circuit provided by the utility model；
Legend：1- microcontrollers, 2- indicating lamp modules, 3- power modules, 4- sensor signal processing modules, 41- sensings
Device, 42- signal differential amplifying circuits, 43- filter circuits, 44- level shift circuits.
Embodiment
To make structure and advantage of the present utility model clearer, structure of the present utility model is made below in conjunction with accompanying drawing
It is further described through.
Embodiment one
The utility model provides the measurement apparatus for High voltage power frequence electric field, including microcontroller 1, the microcontroller
1 output end is connected with indicating lamp module 2, and the input of the microcontroller 1 and the indicating lamp module 2 is also associated with power supply
Module 3, the measurement apparatus also include be connected to the microcontroller 1 input at least all the way sensor signal processing mould
Block 4；
Wherein, the sensor signal processing module 4 includes signal differential amplifying circuit 42, the signal differential amplification electricity
One end that road 42 includes input resistance R7, the input resistance R7 connects as input, the other end of the input resistance R7
Operational amplifier U1 inverting input, amplifier resistance of being connected between the inverting input and output end of the operational amplifier U1
R2, the input resistance R7 input connection grounding resistance R16 one end, the other end ground connection of the grounding resistance R16, institute
State the operational amplifier U1 grounded resistance R19 ground connection of in-phase input end, the output end connection output of the operational amplifier U1
Resistance R12 one end.
In force, as shown in figure 1, power module 3 is respectively to microcontroller 1, sensor signal processing module 4, instruction
Lamp module 2 is powered, wherein, sensor signal processing module 4 only represents sensor signal processing module wherein all the way in Fig. 1
4.In order to avoid the reason of the installation site of sensor signal processing module 4 leads to not sense effective voltage, in the present embodiment
Middle sensor signal processing module elects three tunnels as.The way of sensor signal processing module 4 is more, to the standard of power frequency electric field measurement
True property is higher.
First, the sensor signal processing module 4 in power frequency alternating electric field will get measurement signal and carry out a system
Column processing handled after signal, the signal after the reading process of microcontroller 1, the signal is calculated by certain digital filtering
Method filters out irrational interference signal, then the alarm threshold value set in advance with user is compared, during higher than this threshold value, indicator lamp
Indicator lamp sends light alarm in module 2, then prompts user to enter safe distance scope；During less than this threshold value, indicator lamp mould
Indicator lamp is in OFF state in block 2, then prompts user beyond safe distance scope.
Further, sensor signal processing module 4 includes signal differential amplifying circuit 42, as shown in Fig. 2 signal differential amplifies
Circuit 42 forms high cmrr operational amplifier by resistance R2, resistance R7, resistance R16, resistance R19 operational amplifiers U1.
Because measurement apparatus is operated in the transformer station of electromagnetic interference strongly, condition of work very severe, therefore in signal differential
The input of amplifying circuit 42 is often connected to larger interference signal, is entirely that identical is disturbed sometimes, i.e. common mode disturbances, general
Although amplifier also have certain rejection ability to the common-mode signal at direct differential end, during moved end circuit asymmetry of being on duty
Good inhibiting effect is not had to common mode disturbances, so as to be affected greatly to measurement accuracy.In order to reduce this influence,
Therefore the present embodiment from high cmrr operational amplifier extraction useful signal and is amplified and suppression common mode interference letter
Number.
Optionally, the sensor signal processing module 4 also includes being connected to the defeated of the signal differential amplifying circuit 42
Go out the filter circuit 43 at end.
In force, as shown in figure 1, the output end of signal differential amplifying circuit 42 is connected with filter circuit 43, filtered electrical
Road 43 is used to be filtered processing to the output signal of signal differential amplifying circuit 42.
Because the equipment run in transformer station and the equipment nearby run can produce the very wide interference signal of spectral range, separately
Dispatch from foreign news agency field signal also has wider spectral range, it is necessary to during 41 signal processing circuit of electric-field sensor in itself, because electric field passes
Sensor 41 itself has wider bandwidth of operation, while the interference signal that also will be above electric field signal frequency filters out, therefore filters
Wave circuit 43 is using the excellent wave filter of low pass behavior.
Optionally, as shown in figure 3, in the filter circuit 43：
Including operational amplifier U2, operational amplifier U3, input resistance R13, resistance R14, resistance R8, grounding resistance R20,
Amplifier resistance R4, ground capacity C35, ground capacity C36, filter capacitor C28；
The grounded electric capacity C35 connection output resistances R12 in one end of the input resistance R13 other end, the input electricity
Hinder in-phase input end of the R13 other end through resistance R14 concatenation operation amplifiers U2, one end connection of the filter capacitor C28
Input resistance R13 and resistance R14 common point, the other end concatenation operation amplifier U2's of the filter capacitor C28 is anti-phase defeated
Enter end；
The inverting input of the operational amplifier U2 is connected with itself output end, the same phase of the operational amplifier U2
The grounded electric capacity C36 ground connection of input, the output end connection resistance R8 of operational amplifier U2 one end, the resistance R8
Other end concatenation operation amplifier U3 inverting input, the inverting input and operational amplifier of the operational amplifier U3
Series connection amplifier resistance R4, the operational amplifier the U3 grounded resistance R20 of in-phase input end resistance connect between U3 output end
Ground.
In force, as shown in figure 3, by electric capacity C28, electric capacity C35, electric capacity C36, resistance R13, resistance in filter circuit 43
R14, operational amplifier U2 form low pass filter, and form amplification by operational amplifier U3, resistance R4, resistance R8, resistance R20
Device.The amplifier and the low pass filter are grouped together into a composite low-pass, signal differential amplification electricity
Filtering of the output signal on road 42 Jing Guo composite low-pass, the signal in passband are chosen, and the signal in stopband is prevented from,
Form the intermediate zone between narrower passband and stopband；Signal in last passband via the operational amplifier U3 output
End output.
Optionally, the sensor signal processing module 4 also includes being connected to the defeated of the signal differential amplifying circuit 42
Enter the electric-field sensor 41 at end.
In force, as shown in figure 1, sensor signal processing module 4 is additionally included in the defeated of signal differential amplifying circuit 42
Enter end and be connected with electric-field sensor 41, first, be required for producing induced electricity by electric-field sensor 41 in power frequency alternating electric field
Pressure, then, is sequentially ingressed into signal differential amplifying circuit 42 and filter circuit 43 in the rear end of electric-field sensor 41, is put through signal
Greatly, filter, after impedance matching circuit, finally, caused voltage can just be used as measurement signal on electric capacity.
Optionally, the electric-field sensor 41 is Archimedian spiral antenna.
In force, electric-field sensor 41 is used for different occasions, there is different structures, at present, for electric field measurement one
As all select charge type sensor, the structure of charge type sensor has spherical, parallel-plate-type, cell type etc..But charge type senses
The volume of device is larger, is unfavorable for portable design.According to verification experimental verification, the helical antenna for measuring high-frequency signal also can be effectively right
Power frequency electric field measures, and small volume, is easy to carry, and is more easy to make, and cost is lower, therefore the electric field of the measurement apparatus passes
Sensor 41 is Archimedian spiral antenna.
Optionally, the sensor signal processing module 4 also includes the electricity for being connected to the output end of the filter circuit 43
Flat off-centre circuit 44.
In force, must except to signal progress because what is measured on electric-field sensor 41 is extremely faint signal
The amplification wanted, filtering and impedance matching processing, it is also necessary to the signal is subjected to analog signal conversion digital signal processing, therefore,
Level shift circuit 44 is connected with the output end of filter circuit 43.
Optionally, the level shift circuit 44 includes A/D sampling A/D chips, the model of the A/D sampling A/D chips
AD7606-6。
In force, A/D sampling A/D chips be a 16,6 Channel Synchronous sampling modulus data acquisition system (DAS), it
Input range is 0-5V, using single supply working method, has filtering and high input impedance in piece, without driving operational amplifier
With outside bipolar power supply.
Therefore, need ambipolar AC signal becoming unipolar exchange letter before level shift circuit 44 is carried out
Number, and become A/D sampling A/D chip acceptable level ranges to its voltage magnitude, here by input voltage amplitude lifting 2V,
And the output voltage range for adjusting signal differential amplifying circuit 42 and filter circuit 43 is ± 2V, so enters A/D sampling A/D chips
Range of signal when 0-4V, just meet the requirement of A/D sampling A/D chips.
Optionally, the model LPC1758 of the microcontroller 1.
In force, LPC1758 chips use high performance ARM Cortex-M3 32 ISC kernels, working frequency
For 100MHz, internal high-speed memories.With stronger interference free performance, the requirement of transformer station's adverse circumstances can be met.
The utility model provides the measurement apparatus for High voltage power frequence electric field, including microcontroller, microcontroller it is defeated
Go out end and be connected with indicating lamp module, the input of microcontroller and indicating lamp module is also associated with power module, and measurement apparatus is also
Including at least sensor signal processing module all the way for the input for being connected to microcontroller；Sensor signal processing module includes
Signal differential amplifying circuit.By sensor signal processing module during power frequency electric field measurement signal, by signal differential
Amplifying circuit extracts useful signal and amplify and suppression common mode interference signal, and then makes measurement result accurately and reliably, raising
Measurement accuracy.
Each sequence number in above-described embodiment is for illustration only, does not represent the elder generation during the assembling or use of each part
Order afterwards.
Embodiment of the present utility model is the foregoing is only, it is all in the utility model not to limit the utility model
Spirit and principle within, any modification, equivalent substitution and improvements made etc., should be included in protection model of the present utility model
Within enclosing.
Claims (8)
1. it is connected with instruction for the measurement apparatus of High voltage power frequence electric field, including microcontroller, the output end of the microcontroller
The input of lamp module, the microcontroller and the indicating lamp module is also associated with power module, it is characterised in that the survey
Amount device also includes at least sensor signal processing module all the way for being connected to the input of the microcontroller；
Wherein, the sensor signal processing module includes signal differential amplifying circuit, and the signal differential amplifying circuit includes
Amplify as input, the other end concatenation operation of the input resistance R7 input resistance R7, the input resistance R7 one end
Device U1 inverting input, connect amplifier resistance R2 between the inverting input and output end of the operational amplifier U1, described
Input resistance R7 input connection grounding resistance R16 one end, the other end ground connection of the grounding resistance R16, the computing
The amplifier U1 grounded resistance R19 ground connection of in-phase input end, the output end connection output resistance R12 of the operational amplifier U1
One end.
2. the measurement apparatus according to claim 1 for High voltage power frequence electric field, it is characterised in that the sensor signal
Processing module also includes the filter circuit for being connected to the output end of the signal differential amplifying circuit.
3. the measurement apparatus according to claim 2 for High voltage power frequence electric field, it is characterised in that in the filter circuit
In：
Including operational amplifier U2, operational amplifier U3, input resistance R13, resistance R14, resistance R8, grounding resistance R20, amplifier
Resistance R4, ground capacity C35, ground capacity C36, filter capacitor C28；
The grounded electric capacity C35 connection output resistances R12 in one end of the input resistance R13 other end, the input resistance R13
In-phase input end of the other end through resistance R14 concatenation operation amplifiers U2, the filter capacitor C28 one end connection input electricity
Hinder R13 and resistance R14 common point, the other end concatenation operation amplifier U2 of filter capacitor C28 inverting input；
The inverting input of the operational amplifier U2 is connected with itself output end, the in-phase input end of the operational amplifier U2
Grounded electric capacity C36 ground connection, the output end connection resistance R8 of operational amplifier U2 one end, the other end of the resistance R8
Concatenation operation amplifier U3 inverting input, the inverting input of the operational amplifier U3 and operational amplifier U3 output
The grounded resistance R20 ground connection of series connection amplifier resistance R4, the operational amplifier U3 in-phase input end resistance between end.
4. the measurement apparatus according to claim 1 for High voltage power frequence electric field, it is characterised in that the sensor signal
Processing module also includes the sensor for being connected to the input of the signal differential amplifying circuit.
5. the measurement apparatus according to claim 4 for High voltage power frequence electric field, it is characterised in that the sensor for Ah
Base Mead helical antenna.
6. the measurement apparatus according to claim 2 for High voltage power frequence electric field, it is characterised in that the sensor signal
Processing module also includes the level shift circuit for being connected to the output end of the filter circuit.
7. the measurement apparatus according to claim 6 for High voltage power frequence electric field, it is characterised in that the level deviation electricity
Road includes A/D sampling A/D chips, the model AD7606-6 of the A/D sampling A/D chips.
8. the measurement apparatus according to claim 1 for High voltage power frequence electric field, it is characterised in that the microcontroller
Model LPC1758.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720668049.3U CN206990685U (en) | 2017-06-09 | 2017-06-09 | Measurement apparatus for High voltage power frequence electric field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720668049.3U CN206990685U (en) | 2017-06-09 | 2017-06-09 | Measurement apparatus for High voltage power frequence electric field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206990685U true CN206990685U (en) | 2018-02-09 |
Family
ID=61396550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720668049.3U Active CN206990685U (en) | 2017-06-09 | 2017-06-09 | Measurement apparatus for High voltage power frequence electric field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206990685U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192896A (en) * | 2017-06-09 | 2017-09-22 | 国网浙江省电力公司杭州供电公司 | Measurement apparatus for High voltage power frequence electric field |
-
2017
- 2017-06-09 CN CN201720668049.3U patent/CN206990685U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192896A (en) * | 2017-06-09 | 2017-09-22 | 国网浙江省电力公司杭州供电公司 | Measurement apparatus for High voltage power frequence electric field |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204425298U (en) | A kind of faint AC signal amplitude lock-in amplifier | |
| CN203849322U (en) | Low voltage power supply surge protector resistive current monitoring device | |
| CN108646138A (en) | Network of ship electric energy quality monitoring system based on FPGA and method | |
| CN206670548U (en) | A kind of channel wireless radio multi strain acquirement node for civil structure health monitoring | |
| CN206725655U (en) | A kind of electric car BMS Insulation Inspection Systems | |
| CN104330691A (en) | Online monitoring system for power transformer winding vibration signals | |
| CN204101640U (en) | Contactless CVT dielectric loss measurement system | |
| CN106483348A (en) | A kind of ripple detection circuit | |
| CN206074741U (en) | A kind of detection circuit for grounding net defect diagnosis | |
| CN107192896A (en) | Measurement apparatus for High voltage power frequence electric field | |
| CN206990685U (en) | Measurement apparatus for High voltage power frequence electric field | |
| CN207198234U (en) | A kind of isolated neutral capacitance current of distribution network measurement apparatus | |
| CN205562768U (en) | Equipment of battery resistance is measured to four terminals | |
| CN110441704A (en) | Battery detection circuit | |
| CN204666751U (en) | A kind of Zinc-Oxide Arrester on-Line Monitor Device based on dsp chip | |
| CN205753404U (en) | A kind of electric energy governing device system | |
| CN104111027B (en) | Lissajous figure analytical method based transformer power frequency signal sensor system | |
| CN207924056U (en) | Insulator leakage current monitors system | |
| CN203883774U (en) | Module for amplifying signals in transformer substation gas concentration detection system | |
| CN107070426A (en) | A kind of amplifier and its implementation | |
| CN203122375U (en) | Non-invasive blood pressure anti-interference circuit | |
| CN208239510U (en) | A kind of Weak current monitoring circuit under the condition of spark for earthing or grounding means | |
| CN201854089U (en) | On-line monitoring device for filtering compensation equipment | |
| CN206369754U (en) | A kind of ripple detection circuit | |
| CN205691660U (en) | A kind of power input to a machine counting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |