CN206990685U - Measurement apparatus for High voltage power frequence electric field - Google Patents

Measurement apparatus for High voltage power frequence electric field Download PDF

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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
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China
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resistance
input
measurement
output
operational amplifier
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CN201720668049.3U
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Chinese (zh)
Inventor
沈正阳
李旭东
陈晨
徐建文
马涛
贾建良
王建强
杨中彪
陈悦
胡坚
许杰
王海荣
孙琳
陈致远
沈萍
王开芳
宋文泳
韩青
鲍巧敏
陈豪
余丰
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Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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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

Measurement apparatus for High voltage power frequence electric field
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.
CN201720668049.3U 2017-06-09 2017-06-09 Measurement apparatus for High voltage power frequence electric field Active CN206990685U (en)

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

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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)

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