CN206892193U - A kind of weak current soil resistivity measuring system - Google Patents
A kind of weak current soil resistivity measuring system Download PDFInfo
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- CN206892193U CN206892193U CN201720803550.6U CN201720803550U CN206892193U CN 206892193 U CN206892193 U CN 206892193U CN 201720803550 U CN201720803550 U CN 201720803550U CN 206892193 U CN206892193 U CN 206892193U
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Abstract
A kind of weak current soil resistivity measuring system of the utility model, can both reduce measurement energy consumption, be easy to carry again, easy to use, combination temperature compensation technique, utilize the confidence level of the soil resistivity average value under different exciting currents, further lifting measurement data.The system includes the first measuring electrode, the second measuring electrode, excitation source module, detection module and intelligent processor module；The excitation source module and detection module both ends are connected in parallel to the first measuring electrode and the second measuring electrode, the driving source blocks current signal control signal is connected with the intelligent processor blocks current signal control output end, and the detection module voltage signal output end is connected with the intelligent processor module voltage signal input part；The excitation source module exports different weak current signals, the detection module collection soil response voltage, the intelligent processor module control excitation source module, collection soil response voltage signal, calculates soil resistivity.
Description
Technical field
The utility model belongs to soil resistivity e measurement technology, and in particular to a kind of weak current soil resistivity measurement system
System.
Background technology
Electric power energy is closely bound up with national development and people's lives as energy foundation stone and power.As internet is believed
Breath technology, big data, the rapid development of cloud computing, infrastructure paces are accelerated, and for support, country is fast-developing, newly-built, building
Power plant scale goes from strength to strength.As essential intermediate link in electrical energy production, conveying and process of consumption, can it pacify for transformer station
Full stable operation is directly connected to the power supply reliability of power system, continuity.Grounded screen is as Substation Electric Equipment and prevents
The important component of thunder protective grounding, can be that substation safety stable operation escorts.Normally grounded net mounting and installation
In underground, its running status is more hidden, it is difficult to directly observes.
To reduce circuit on power system loss, whole voltage class of electric power system and capacity gradually increase, because of imperfect earth
Caused by security incident happen occasionally.Soil resistivity can embody transformer station's regional soil quality and physical property, soil
Resistivity is to influence the important characterization parameter of grounding resistance, plant area of transformer station surface potential gradient, step voltage and contact voltage,
Can the whether qualified direct relation Substation Electric Equipment again of grounding resistance safe and stable run.Substation grounding quality is not high
Or it is not good enough, cannot effective lightning protection, therefore Correct Analysis soil resistivity to grounding net of transformer substation A+E to close weight
Will, while vital effect can be played for grounding net of transformer substation addressing, design.
It is main for different soils distribution physicochemical property and test sampling typicalness, common soil resistivity measuring method
It is divided into one-pole method and level Four method, wherein level Four method is divided into two kinds of method of equal intervals and non-equidistant method again.One-pole method is in tested soil place
A diameter of d monopole vertical electrode is embedded to, depth of burying h, single electrode grounding resistance R is measured using earth loop impedance test instrumentd,
Then utilizeCalculate as allowed electricalresistivityρd, one-pole method test result contacts closely easily between by soil and electrode
Degree influences；Level Four method is applied to away from subject electrode farther out or the larger soil in region, level Four method of equal intervals test philosophy such as Fig. 1 institutes
Show, earth loop impedance test instrument is using potential difference between potential pole P1, P2 divided by flows through electric current pole C1, C2 electric current, obtains resistance Rds,
Pass through ρds=2 π adsRdsObtain electricalresistivityρds, wherein adsThe distance between adjacent electrode；Level Four non-equidistant method test philosophy is such as
It is similar to method of equal intervals using potential difference between potential pole P1, P2 divided by flow through electric current pole using earth loop impedance test instrument shown in Fig. 2
C1, C2 electric current obtain resistance Rfs, pass through ρfs=2 π afs(afs+bfs)Rfs/bfsObtain electricalresistivityρfs, wherein afsElectric current pole and electricity
Distance between the pole of position, bfsThe distance between potential pole.When burying interelectrode in larger distance, potential pole on the inside of level Four method of equal intervals
Between electrical potential difference reduce rapidly, existing instrument is difficult to measure the electrical potential difference.
Problems be present in soil resistivity measurement in the prior art：(1) it is big, it is necessary to which multiple person cooperational is complete to measure enforcement difficulty
Into measurement, especially level Four method, electric current and potential electrode arrangement are distant, and measurement apparatus and cable are not portable enough；(2) apply
When adding different exciting currents, measurement every time needs staff to change excitation ource electric current again again after manually completing, and instrument is not implemented
Device changes exciting current and detection response voltage automatically；(3) exciting current is generally larger, there is not yet microampere order exciting current,
Increase the energy consumption of whole test process indirectly.
In summary, measurement energy consumption can both be reduced by designing a kind of weak current soil resistivity measuring system, be easy to take again
Band, easy to use, combination temperature compensation technique, utilize the soil resistivity average value under different exciting currents, further lifting
The confidence level of measurement data, had great significance in soil resistivity field of measuring technique.
Utility model content
The purpose of this utility model is the deficiency existing for existing soil resistivity e measurement technology, there is provided a kind of light current
Flow soil resistivity measuring system, the system is easy to carry, and flexibility is strong, again can improving measurement accuracy, further reduce measurement
Cost of labor.
To reach above-mentioned purpose, the utility model is adopted the following technical scheme that to realize：
A kind of weak current soil resistivity measuring system, including the first measuring electrode, the second measuring electrode, driving source mould
Block, detection module and intelligent processor module；
Two two current signal output ends of the excitation source module, detection module voltage signal inputs are respectively connecting to
First measuring electrode and the second measuring electrode, the driving source blocks current signal control signal and the intelligent processor mould
Block current signal control output end is connected, and the detection module voltage signal output end is believed with the intelligent processor module voltage
Number input is connected；
The excitation source module is used to export different weak current signals, makes to be connected thereto the first measuring electrode and the second measurement
Soil response voltage changes between electrode；
The detection module is used to gather between the first measuring electrode and the second measuring electrode in the output of excitation source module not
Voltage is responded with soil corresponding during weak current signal；
The intelligent processor module control excitation source module exports different weak currents, and analysis detection module detects correspondingly
Soil response voltage signal, calculate soil resistivity.
Preferably, the system also includes display module, and the display module is with serial communication mode and intelligent processor
Module communicates, and for showing, recording the resistivity of acquired tested soil.
Preferably, the system also includes temperature measurement module, and the intelligent processor module is read using serial communication mode
The soil moisture parameter that temperature measurement module is gathered, for correcting soil resistivity size.
Preferably, it is described excitation source module include REF200 normalized currents source U2, OPA602 operational amplifier U1,
MCP41010 programmable digital potentiometers U5, electric capacity C1, resistance R1 and current signal output end mouth P2；
The pins of REF200 normalized currents source U2 the 1st and the 2nd pin connect with VCC-12V power supplys, the REF200
The pins of normalized current source U2 the 7th and the 8th pin connect with the pins of OPA602 operational amplifiers U1 the 2nd, the OPA602
The pins of operational amplifier U1 the 7th connect with VCC12V power supplys, one end of the resistance R1 and the OPA602 operational amplifiers U1
3rd pin and the pins of current signal output end mouth P2 the 2nd connect, and the other end is connected to the OPA602 operational amplifiers U1 the 6th
Pin, described one end for drawing foot meridian capacitor C1 of MCP41010 programmable digitals potentiometer U5 the 7th are connected to the OPA602 computings
The pins of amplifier U1 the 2nd, the MCP41010 programmable digitals potentiometer U5 the 6th draw the foot meridian capacitor C1 other end with it is described
The pins of OPA602 operational amplifiers U1 the 6th are connected, the pins of MCP41010 programmable digitals potentiometer U5 the 4th and current signal
The pins of output port P2 the 1st connect with power supply, the pins of MCP41010 programmable digitals potentiometer U5 the 8th and VCC5V
Power supply connects, and the pins of current signal output end mouth P2 the 1st are connected to the second measuring electrode, the 2nd pin is connected to the first survey
Measure electrode.
Further, the intelligent processor module includes STC15W404 intelligent processors U3 and COM1 P1；It is described
The pins of STC15W404 intelligent processors U3 the 8th and the pins of COM1 P1 the 1st are connected with power supply, the STC15W404 intelligence
Can the pins of processor U3 the 6th be connected to VCC5V power supplys, the pins of STC15W404 intelligent processors U3 the 15th, the 16th pin,
1st pin is connected respectively to the pins of MCP41010 programmable digitals potentiometer U5 the 1st, the 2nd pin, the 3rd pin, institute
State the pins of COM1 P1 the 3rd, the 2nd pin is connected respectively the pins of STC15W404 intelligent processors U3 the 10th, the 11st
Pin.
Further, the detection module includes ICL7135 virtual values modulus conversion chip U4, resistance R2, resistance R3, resistance
R4, resistance R5, resistance R6, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, cache switching diodes D1,
Voltage responsive signal acquisition port P3, CD4060 frequency divider U6, crystal oscillator Y1；
The pins of voltage responsive signal acquisition port P3 the 2nd, the pins of ICL7135 virtual value modulus conversion chips U4 the 3rd,
9th pin and the 24th pin, the pins of CD4060 frequency dividers U6 the 12nd and the 8th pin connect with power supply, and the ICL7135 has
The pins of valid value modulus conversion chip U4 the 2nd, the 11st pin are connected with VCC5V power supplys, and one end of the electric capacity C2 connects respectively
To electric capacity C3 and resistance R4 one end, the other end of the electric capacity C2 is connected to the ICL7135 virtual values modulus through resistance R3
The pins of conversion chip U4 the 4th, the other end of the electric capacity C3 connect with the pins of ICL7135 virtual value modulus conversion chips U4 the 5th,
The other end of the resistance R4 is connected with the pins of ICL7135 virtual value modulus conversion chips U4 the 6th, the both ends point of the electric capacity C4
The pins of ICL7135 virtual value modulus conversion chips U4 the 7th and the 8th pin, the voltage responsive signal acquisition port are not connected to
The pins of P3 the 1st connect respectively through resistance R5 and the pins of ICL7135 virtual value modulus conversion chips U4 the 10th, the both ends of the electric capacity C5
It is connected to the pins of ICL7135 virtual value modulus conversion chips U4 the 9th and the 10th pin, the ICL7135 virtual values analog-to-digital conversion core
The pins of piece U4 the 4th successively through cache switching diodes D1 negative electrodes, cache switching diodes D1 anodes, resistance R2 phase with power supply
Connect, the pins of ICL7135 virtual values modulus conversion chip U4 the 20th, the 19th pin, the 18th pin, the 17th pin, the 16th are drawn
Pin, the 15th pin, the 14th pin, the 13rd pin, the 26th pin are connected respectively to the STC15W404 intelligent processors U3
2nd pin, the 3rd pin, the 4th pin, the 5th pin, the 14th pin, the 13rd pin, the 12nd pin, the 7th pin, the 11st pin,
The pins of CD4060 frequency dividers U6 the 16th connect with VCC5V power supplys, both ends after resistance R6 and crystal oscillator the Y1 parallel connections
It is connected to the pins of CD4060 frequency dividers U6 the 10th, the 11st pin, the pins of CD4060 frequency dividers U6 the 10th, the 11st pin difference
Connect through electric capacity C17, electric capacity C6, the pins of CD4060 frequency dividers U6 the 5th are connected to ICL7135 virtual value moduluses with power supply
The pins of conversion chip U4 the 22nd, the pins of voltage responsive signal acquisition port P3 the 1st are connected to the first measuring electrode, the 2nd drawn
Pin is connected to the second measuring electrode.
Preferably, at a distance of 1cm between first measuring electrode and the second measuring electrode.
Compared with prior art, the utility model has technique effect beneficial below：
The modules such as the utility model driving source, detection, intelligent processor use modularized design scheme, are easy to build soil
Resistivity measurement system, plug-in port is reserved, reduce system installation wiring degree.By driving source, detection mould during onsite application
Both ends connect the first measurement and the second measuring electrode, intelligent processor module control driving source output microampere order respectively after block parallel connection
Weak current signal, voltage responsive corresponding to the different electric currents of detection module collection, subject electric resistance of soil is calculated using Ohm's law,
And electric resistance of soil is surveyed using soil area's temperature-compensating is tested acquired in temperature measurement module, then ask for different driving source output situations
The average value of lower electric resistance of soil, measurement error is eliminated, finally calculate subject regional soil resistivity using resistance theorem.
Further, the utility model utilizes integrated touch screen, enters row information with serial communication mode and intelligent processor
Interaction, directly perceived, timely display soil resistivity measurement result, measuring electrode area is set on the touch-screen in advance using preceding,
The parameters such as anode-cathode distance, intelligent processor electrode parameter set by, data foundation is provided for the follow-up soil resistivity that calculates.
Further, the utility model accurately detects the subject soil moisture using temperature measurement module, equally with serial communication side
Formula transmits measured temperature to intelligent processor, and intelligent processor directly corrects the different electric currents of driving source output and measures to obtain soil
Resistance, lift the generality of testing result.
Further, the utility model excitation source module passes through height using REF200 normalized currents source output 200uA electric currents
Fast precision operational-amplifier OPA602 combinations programmable digital potentiometer MCP41010, is controlled by STC15W404 intelligent processors
The variable weak current signals of 10-200uA are exported, reduce soil resistivity measurement energy consumption indirectly.
Further, this practicality may be programmed number using low-power consumption, without peripheral circuit STC15W404 intelligent processors, control
Word potentiometer MCP41010 exports different resistances, coordinates high speed and precision operational amplifier OPA602 and normalized current source REF200 defeated
Go out weak current signal, utilize ICL7135 virtual value modulus conversion chip recording responses voltage signals.
Further, the utility model uses 14 integral form modulus conversion IC L7135 chips, measuring electrode one and two it
Between apply electric current after, between two electrodes response signal input successively through RC filtering and difference channel, eliminate high frequency, common-mode signal it is dry
Disturb, tested response signal is converted to binary-coded decimal and transmitted to STC15W404 Intelligent treatments by ICL7135 virtual values modulus conversion chip
Device, it is easy to STC15W404 intelligent processors to read and restore the virtual value of tested voltage signal.
Brief description of the drawings：
Fig. 1 is level Four method of equal intervals measured resistivity measuring principle figure in the prior art.
Fig. 2 is level Four non-equidistant method measured resistivity measuring principle figure in the prior art.
Fig. 3 is the utility model structural principle block diagram.
Fig. 4 is the utility model driving source module circuit schematic.
Fig. 5 is the utility model intelligent processor module circuit schematic.
Fig. 6 is the utility model detection module circuit theory diagrams.
In figure：First measuring electrode 1, the second measuring electrode 2, temperature measurement module 3, excitation source module 4, detection module 5, intelligence
Processor module 6, display module 7.
Embodiment：
The utility model is described in further detail with reference to specific embodiment, described is to the utility model
Explanation rather than restriction.
The utility model is easy to use, with reference to weak current and technique for temperature compensation, Data Detection precision is lifted, suitable for hair
Power plant, substation grounding engineering device technique field.
As shown in figure 3, the utility model includes the first measuring electrode 1, the second measuring electrode 2, excitation source module 4, detection
Module 5 and intelligent processor module 6；
5 two 4 two current signal output ends of the excitation source module, detection module voltage signal inputs connect respectively
To the first measuring electrode 1 and the second measuring electrode 2, at the excitation current signal control signal of source module 4 and the intelligence
The current signal control output end of reason device module 6 is connected, the voltage signal output end of detection module 5 and the intelligent processor mould
The voltage signal inputs of block 6 are connected；
The excitation source module 4 is used to export different weak current signals, makes to be connected thereto the first measuring electrode 1 and the second survey
Soil response voltage changes between measuring electrode 2；
The detection module 5 is used to gather defeated in excitation source module 4 between the first measuring electrode 1 and the second measuring electrode 2
Go out soil response voltage corresponding during different weak current signals；
The control of the intelligent processor module 6 excitation source module 4 exports different weak currents, and analysis detection module 5 is detected
Corresponding soil responds voltage signal, calculates soil resistivity.
In the present embodiment, the system also includes display module 7, and the display module 7 is with serial communication mode and intelligence
Processor module 6 communicates, and for showing, recording the resistivity of acquired tested soil, the display module 7 is using integrated
Touch-screen, directly perceived, timely display soil resistivity measurement result, use the preceding setting measuring electrode face on the touch-screen in advance
Product, the parameter such as anode-cathode distance, intelligent processor electrode parameter according to set by, for subsequently calculating soil resistivity provide data according to
According to.
In the present embodiment, the system also includes temperature measurement module 3, and the intelligent processor module 6 utilizes serial communication side
Formula reads the soil moisture parameter that temperature measurement module 3 is gathered, and for correcting soil resistivity size, lifts the universal of testing result
Property.
As shown in figure 4, in the present embodiment, the excitation source module 4 includes REF200 normalized currents source U2, OPA602
Operational amplifier U1, MCP41010 programmable digital potentiometer U5, electric capacity C1, resistance R1 and current signal output end mouth P2；
The pins of REF200 normalized currents source U2 the 1st and the 2nd pin connect with VCC-12V power supplys, the REF200
The pins of normalized current source U2 the 7th and the 8th pin connect with the pins of OPA602 operational amplifiers U1 the 2nd, the OPA602
The pins of operational amplifier U1 the 7th connect with VCC12V power supplys, one end of the resistance R1 and the OPA602 operational amplifiers U1
3rd pin and the pins of current signal output end mouth P2 the 2nd connect, and the other end is connected to the OPA602 operational amplifiers U1 the 6th
Pin, described one end for drawing foot meridian capacitor C1 of MCP41010 programmable digitals potentiometer U5 the 7th are connected to the OPA602 computings
The pins of amplifier U1 the 2nd, the MCP41010 programmable digitals potentiometer U5 the 6th draw the foot meridian capacitor C1 other end with it is described
The pins of OPA602 operational amplifiers U1 the 6th are connected, the pins of MCP41010 programmable digitals potentiometer U5 the 4th and current signal
The pins of output port P2 the 1st connect with power supply, the pins of MCP41010 programmable digitals potentiometer U5 the 8th and VCC5V
Power supply connects, and the pins of current signal output end mouth P2 the 1st are connected to the second measuring electrode 2, the 2nd pin is connected to the first survey
Measure electrode 1；The REF200 normalized currents source U2 exports 200uA electric currents, is tied by OPA602 high speed and precision operational amplifiers U1
Programmable digital potentiometer MCP41010 is closed, the variable weak currents of output 10-200uA are controlled by STC15W404 intelligent processors
Signal.
As shown in figure 5, in the present embodiment, the intelligent processor module 6 includes STC15W404 intelligent processors U3 and led to
Believe port P1；The pins of STC15W404 intelligent processors U3 the 8th and the pins of COM1 P1 the 1st are connected with power supply, institute
State the pins of STC15W404 intelligent processors U3 the 6th and be connected to VCC5V power supplys, the STC15W404 intelligent processors U3 the 15th draws
Pin, the 16th pin, the 1st pin, which are connected respectively to the pins of MCP41010 programmable digitals potentiometer U5 the 1st, the 2nd, to be drawn
Pin, the 3rd pin, the pins of COM1 P1 the 3rd, the 2nd pin are connected respectively the STC15W404 intelligent processors U3
10th pin, the 11st pin；The intelligent processor module 6 uses low-power consumption, without peripheral circuit STC15W404 Intelligent treatments
Device, control programmable digital potentiometer MCP41010 export different resistances, coordinate high speed and precision operational amplifier OPA602 and mark
Quasi- current source REF200 exports weak current signal, utilizes ICL7135 virtual value modulus conversion chip recording responses voltage signals.
As shown in fig. 6, in the present embodiment, the detection module 5 includes ICL7135 virtual value modulus conversion chip U4, electricity
R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7 are hindered, it is high
Fast switching diode D1, voltage responsive signal acquisition port P3, CD4060 frequency divider U6, crystal oscillator Y1；
The pins of voltage responsive signal acquisition port P3 the 2nd, the pins of ICL7135 virtual value modulus conversion chips U4 the 3rd,
9th pin and the 24th pin, the pins of CD4060 frequency dividers U6 the 12nd and the 8th pin connect with power supply, and the ICL7135 has
The pins of valid value modulus conversion chip U4 the 2nd, the 11st pin are connected with VCC5V power supplys, and one end of the electric capacity C2 connects respectively
To electric capacity C3 and resistance R4 one end, the other end of the electric capacity C2 is connected to the ICL7135 virtual values modulus through resistance R3
The pins of conversion chip U4 the 4th, the other end of the electric capacity C3 connect with the pins of ICL7135 virtual value modulus conversion chips U4 the 5th,
The other end of the resistance R4 is connected with the pins of ICL7135 virtual value modulus conversion chips U4 the 6th, the both ends point of the electric capacity C4
The pins of ICL7135 virtual value modulus conversion chips U4 the 7th and the 8th pin, the voltage responsive signal acquisition port are not connected to
The pins of P3 the 1st connect respectively through resistance R5 and the pins of ICL7135 virtual value modulus conversion chips U4 the 10th, the both ends of the electric capacity C5
It is connected to the pins of ICL7135 virtual value modulus conversion chips U4 the 9th and the 10th pin, the ICL7135 virtual values analog-to-digital conversion core
The pins of piece U4 the 4th successively through cache switching diodes D1 negative electrodes, cache switching diodes D1 anodes, resistance R2 phase with power supply
Connect, the pins of ICL7135 virtual values modulus conversion chip U4 the 20th, the 19th pin, the 18th pin, the 17th pin, the 16th are drawn
Pin, the 15th pin, the 14th pin, the 13rd pin, the 26th pin are connected respectively to the STC15W404 intelligent processors U3
2nd pin, the 3rd pin, the 4th pin, the 5th pin, the 14th pin, the 13rd pin, the 12nd pin, the 7th pin, the 11st pin,
The pins of CD4060 frequency dividers U6 the 16th connect with VCC5V power supplys, both ends after resistance R6 and crystal oscillator the Y1 parallel connections
It is connected to the pins of CD4060 frequency dividers U6 the 10th, the 11st pin, the pins of CD4060 frequency dividers U6 the 10th, the 11st pin difference
Connect through electric capacity C17, electric capacity C6, the pins of CD4060 frequency dividers U6 the 5th are connected to ICL7135 virtual value moduluses with power supply
The pins of conversion chip U4 the 22nd, the pins of voltage responsive signal acquisition port P3 the 1st are connected to the first measuring electrode the 1, the 2nd and drawn
Pin is connected to the second measuring electrode 2；The detection module 5 uses 14 integral form modulus conversion IC L7135 chips, measuring electrode
After applying electric current between one and two, response signal input is successively through RC filtering and difference channel, elimination high frequency, common mode between two electrodes
Tested response signal is converted to binary-coded decimal and transmitted to STC15W404 by the interference of signal, ICL7135 virtual values modulus conversion chip
Intelligent processor, it is easy to STC15W404 intelligent processors to read and restore the virtual value of tested voltage signal.
In the present embodiment, at a distance of 1cm between the measuring electrode 2 of the first measuring electrode 1 and second.
The utility model when in use, by intelligent processor module 6 automatically control excitation source module 4 be sequentially output 20uA,
40uA, 60uA, 80uA, 100uA, 120uA, 140uA, 160uA, 180uA, 200uA low current signal, intelligent processor module
6 record corresponding response voltage U according to detection module 5 successively20、U40、U60、U80、U100、U120、U140、U160、U180、U200, and
The resistance R under each current signal is drawn by Ohm's law R=U/I20、R40、R60、R80、R100、R120、R140、R160、R180、R200,
The each resistance of gained passes sequentially through Rx=Rc/(1+m(t-t0)), wherein RxFor resistance after amendment, RcTo there is electricity obtained by Ohm's law
Resistance, m are temperature correction coefficient (taking 0.02), the real time temperature that t is gathered by the temperature measurement module 3, t0For normative reference temperature
(taking 25 DEG C), finally each resistance value after amendment is averaged, obtains resistance RL.Utilize resistivity formula p=S*RL/ L, S
The sectional area of one measuring electrode 1 and the second measuring electrode 2, L are electrode length.Institute's measuring resistance rate p final results are shown in display
Module 7, facilitate staff's record and analysis, and enter next test point and test.
It is described above, only it is preferred embodiment of the present utility model, not the utility model is imposed any restrictions, every
Any simple modification, change and the equivalent structure change made according to the utility model technical spirit to above example, still
Belong in the protection domain of technical solutions of the utility model.
Claims (7)
1. a kind of weak current soil resistivity measuring system, it is characterised in that including the first measuring electrode (1), the second measurement electricity
Pole (2), excitation source module (4), detection module (5) and intelligent processor module (6)；
(5) two (4) two current signal output ends of the excitation source module, detection module voltage signal inputs connect respectively
To the first measuring electrode (1) and the second measuring electrode (2), it is described excitation source module (4) current signal control signal with it is described
Intelligent processor module (6) current signal control output end is connected, detection module (5) voltage signal output end and the intelligence
Energy processor module (6) voltage signal inputs are connected；
The excitation source module (4) is used to export different weak current signals, makes to be connected thereto the first measuring electrode (1) and the second survey
Soil response voltage changes between measuring electrode (2)；
The detection module (5) is used to gather between the first measuring electrode (1) and the second measuring electrode (2) in excitation source module
(4) soil response voltage corresponding during different weak current signals is exported；
Intelligent processor module (6) the control excitation source module (4) exports different weak currents, and analysis detection module (5) is examined
Soil corresponding to survey responds voltage signal, calculates soil resistivity.
2. a kind of weak current soil resistivity measuring system according to claim 1, it is characterised in that also include display mould
Block (7), the display module (7) are communicated with serial communication mode with intelligent processor module (6), and for showing, recording institute
The resistivity of the tested soil obtained.
3. a kind of weak current soil resistivity measuring system according to claim 1, it is characterised in that also including thermometric mould
Block (3), the soil moisture ginseng that the intelligent processor module (6) is gathered using serial communication mode reading temperature measurement module (3)
Number, for correcting soil resistivity size.
A kind of 4. weak current soil resistivity measuring system according to claim 1, it is characterised in that the driving source mould
Block (4) includes REF200 normalized currents source U2, OPA602 operational amplifier U1, MCP41010 programmable digital potentiometer U5, electricity
Hold C1, resistance R1 and current signal output end mouth P2；
The pins of REF200 normalized currents source U2 the 1st and the 2nd pin connect with VCC-12V power supplys, the REF200 standards
The pins of current source U2 the 7th and the 8th pin connect with the pins of OPA602 operational amplifiers U1 the 2nd, the OPA602 computings
The pins of amplifier U1 the 7th connect with VCC12V power supplys, and one end of the resistance R1 is drawn with the OPA602 operational amplifiers U1 the 3rd
Pin and the pins of current signal output end mouth P2 the 2nd connect, and the other end is connected to the pins of OPA602 operational amplifiers U1 the 6th,
Described one end for drawing foot meridian capacitor C1 of MCP41010 programmable digitals potentiometer U5 the 7th is connected to the OPA602 operational amplifiers
The pins of U1 the 2nd, the MCP41010 programmable digitals potentiometer U5 the 6th draws the foot meridian capacitor C1 other end and the OPA602 is transported
Calculate the pins of amplifier U1 the 6th to be connected, the pins of MCP41010 programmable digitals potentiometer U5 the 4th and current signal output end mouth
The pins of P2 the 1st connect with power supply, and the pins of MCP41010 programmable digitals potentiometer U5 the 8th connect with VCC5V power supplys,
The pins of current signal output end mouth P2 the 1st are connected to the second measuring electrode (2), the 2nd pin is connected to the first measuring electrode
(1)。
A kind of 5. weak current soil resistivity measuring system according to claim 4, it is characterised in that the Intelligent treatment
Device module (6) includes STC15W404 intelligent processors U3 and COM1 P1；The STC15W404 intelligent processors U3 the 8th draws
Pin and the pins of COM1 P1 the 1st are connected with power supply, and the pins of STC15W404 intelligent processors U3 the 6th are connected to
VCC5V power supplys, the pins of STC15W404 intelligent processors U3 the 15th, the 16th pin, the 1st pin are connected respectively to institute
State the pins of MCP41010 programmable digital potentiometers U5 the 1st, the 2nd pin, the 3rd pin, the pins of COM1 P1 the 3rd, the 2nd
Pin is connected respectively the pins of STC15W404 intelligent processors U3 the 10th, the 11st pin.
A kind of 6. weak current soil resistivity measuring system according to claim 5, it is characterised in that the detection module
(5) include ICL7135 virtual values modulus conversion chip U4, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C2,
Electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, cache switching diodes D1, voltage responsive signal acquisition port P3,
CD4060 frequency divider U6, crystal oscillator Y1；
The pins of voltage responsive signal acquisition port P3 the 2nd, the pins of ICL7135 virtual value modulus conversion chips U4 the 3rd, the 9th
Pin and the 24th pin, the pins of CD4060 frequency dividers U6 the 12nd and the 8th pin connect with power supply, and the ICL7135 is effective
The pins of value modulus conversion chip U4 the 2nd, the 11st pin are connected with VCC5V power supplys, and one end of the electric capacity C2 is respectively connecting to
Electric capacity C3 and resistance R4 one end, the other end of the electric capacity C2 are connected to the ICL7135 virtual values modulus through resistance R3 and turned
The pins of chip U4 the 4th are changed, the other end of the electric capacity C3 connects with the pins of ICL7135 virtual value modulus conversion chips U4 the 5th, institute
The other end for stating resistance R4 is connected with the pins of ICL7135 virtual value modulus conversion chips U4 the 6th, the both ends difference of the electric capacity C4
It is connected to the pins of ICL7135 virtual value modulus conversion chips U4 the 7th and the 8th pin, the voltage responsive signal acquisition port P3
1st pin connects respectively through resistance R5 and the pins of ICL7135 virtual value modulus conversion chips U4 the 10th, the both ends of the electric capacity C5
To the pins of ICL7135 virtual value modulus conversion chips U4 the 9th and the 10th pin, the ICL7135 virtual values modulus conversion chip
The pins of U4 the 4th connect with power supply through cache switching diodes D1 negative electrodes, cache switching diodes D1 anodes, resistance R2 successively,
The pins of ICL7135 virtual values modulus conversion chip U4 the 20th, the 19th pin, the 18th pin, the 17th pin, the 16th pin,
15th pin, the 14th pin, the 13rd pin, the 26th pin are connected respectively to the STC15W404 intelligent processors U3 the 2nd
Pin, the 3rd pin, the 4th pin, the 5th pin, the 14th pin, the 13rd pin, the 12nd pin, the 7th pin, the 11st pin, it is described
The pins of CD4060 frequency dividers U6 the 16th connect with VCC5V power supplys, and the resistance R6 connects with both ends after crystal oscillator Y1 parallel connections
To the pins of CD4060 frequency dividers U6 the 10th, the 11st pin, the pins of CD4060 frequency dividers U6 the 10th, the 11st pin are respectively through electricity
Appearance C17, electric capacity C6 connect with power supply, and the pins of CD4060 frequency dividers U6 the 5th are connected to ICL7135 virtual value analog-to-digital conversions
The pins of chip U4 the 22nd, the pins of voltage responsive signal acquisition port P3 the 1st are connected to the first measuring electrode (1), the 2nd pin
It is connected to the second measuring electrode (2).
A kind of 7. weak current soil resistivity measuring system according to claim 1, it is characterised in that first measurement
At a distance of 1cm between electrode (1) and the second measuring electrode (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720803550.6U CN206892193U (en) | 2017-07-05 | 2017-07-05 | A kind of weak current soil resistivity measuring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720803550.6U CN206892193U (en) | 2017-07-05 | 2017-07-05 | A kind of weak current soil resistivity measuring system |
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| CN206892193U true CN206892193U (en) | 2018-01-16 |
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| CN201720803550.6U Expired - Fee Related CN206892193U (en) | 2017-07-05 | 2017-07-05 | A kind of weak current soil resistivity measuring system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524867A (en) * | 2018-11-30 | 2019-03-26 | 南宁安普电力设备有限公司 | A kind of compound rapid grounding system installation method of graphene |
| CN110068735A (en) * | 2019-01-24 | 2019-07-30 | 贵州电网有限责任公司 | A method of measurement and reckoning grounding body and soil contact resistance |
| CN113109623A (en) * | 2021-03-25 | 2021-07-13 | 上海联适导航技术股份有限公司 | Soil conductivity measurement system, method, device and medium |
| CN114646807A (en) * | 2022-03-17 | 2022-06-21 | 哈尔滨工业大学 | Frozen soil resistivity testing device based on RC circuit and using method thereof |
-
2017
- 2017-07-05 CN CN201720803550.6U patent/CN206892193U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524867A (en) * | 2018-11-30 | 2019-03-26 | 南宁安普电力设备有限公司 | A kind of compound rapid grounding system installation method of graphene |
| CN110068735A (en) * | 2019-01-24 | 2019-07-30 | 贵州电网有限责任公司 | A method of measurement and reckoning grounding body and soil contact resistance |
| CN113109623A (en) * | 2021-03-25 | 2021-07-13 | 上海联适导航技术股份有限公司 | Soil conductivity measurement system, method, device and medium |
| CN114646807A (en) * | 2022-03-17 | 2022-06-21 | 哈尔滨工业大学 | Frozen soil resistivity testing device based on RC circuit and using method thereof |
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