CN105115885B - A kind of portable ground net corrosion condition monitoring system and monitoring method - Google Patents
A kind of portable ground net corrosion condition monitoring system and monitoring method Download PDFInfo
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- CN105115885B CN105115885B CN201510322850.8A CN201510322850A CN105115885B CN 105115885 B CN105115885 B CN 105115885B CN 201510322850 A CN201510322850 A CN 201510322850A CN 105115885 B CN105115885 B CN 105115885B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 62
- 238000001514 detection method Methods 0.000 claims abstract description 14
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- 239000002689 soil Substances 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 9
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 9
- 230000011664 signaling Effects 0.000 claims description 8
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- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 4
- 230000000875 corresponding Effects 0.000 claims description 4
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[Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 3
- 230000001174 ascending Effects 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound 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Abstract
The invention discloses a kind of portable ground net corrosion condition monitoring system and monitoring methods, including multiple mutually isostructural three electrode sensings header structures, step change type can be changed micromicroampere constant current drive source circuit, integral form millivolt detection circuit, and the data display interface based on Windows operating system.The monitoring system and monitoring method are mainly used for the real-time automatic monitoring of field power grid ground net corrosion rate, it is possible to prevente effectively from the generation of the power system accident as caused by Grounding Grid, step constant current charge Curve Technique can be with the corrosion rate of rapid survey carbon steel grounded screen.The configuration of the present invention is simple, at low cost, stability is high, is suitble to field long-term work, and use unique biproduct parting millivolt detection circuit, substantially increases the detection speed and accuracy of corrosion rate.
Description
Technical field
The present invention relates to the monitoring systems of the ground net corrosion state in power plant and substation, are particularly based on constant current and fill
The device and method of electric Curve Technique measurement carbon steel ground net corrosion rate.
Background technique
Grounding conductor material in domestic power plant and substation is mostly carbon steel, and carbon steel easily occurs rotten in the soil
Erosion, for corrosion rate up to 8mm/a, the seriously corroded of grounded screen threatens the safety fortune of power grid in the stronger soil of corrosivity
Row.In China, the power system accident because of caused by ground net corrosion happens occasionally, and each accident all brings huge economy
Loss.Grounded screen heavy corrosion region can be found in time by carrying out Corrosion monitoring to grounded screen, not cause major accident at it
Before, it adopts an effective measure in time, it will reduce or prevent the generation of the power system accident because of caused by ground net corrosion.At present
Corrosion diagnosis of grounding grid searches ground connection by excavating mainly after discovery Resistance of Grounding Grids is unqualified or after there is accident
Net corrosion area, this method have blindness, and heavy workload, speed are slow, and are limited by live service condition.
Electrochemical corrosion mainly occurs in the soil for grounded screen metal material, and electrochemical parameter is characterization ground net corrosion shape
The most effective means of state, activation polarization resistance technology can measure the instantaneous corrosion rate and local corrosion tendency of metal.By
Interference signal is very strong in grounding net of transformer substation local environment, if means of filtering is not taken to be unable to get true electrification at all
Learn measurement response signal.In view of the filtering of signal needs, when grounded screen in-site measurement, it is suitble to the electrochemical measurement using transient state
Method.Constant current charge curve method belongs to transient state relaxing techniques, and test method is simple and fast, and can eliminate ohm of soil
Drop, therefore it is suitble to the on-site test of ground net corrosion state.
Summary of the invention
The object of the present invention is to provide a kind of portable ground net corrosion condition monitoring system and monitoring methods.Using step
Formula constant-current source and double integrator data acquisition modes design concept are unique, novel, and can effectively solve the problem that grounded screen physical presence
The problem of, it has been pushed further into the development that China is grounded corrosion-resistant technical aspect, there is very strong practical reference value and society
Value.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:A kind of portable ground net corrosion state prison
Examining system, it is characterised in that:
Including for in polarization reaction three-electrode structure between auxiliary electrode and Electrode apply polarization pumping signal
0-100uA step current signaling module and acquisition reference electrode and Electrode between exciter response double integrator voltage data
Acquisition module, and for the power management module of each module for power supply of device and to the control of 0-100uA step current signal, double integrator
Data sampling signal analyze the microprocessor module of obtained soil corrosion rate.
The 0-100uA step current signaling module is successively by REF200 standard 100uA current mirror image source, accurate operation
Amplifier OPA602, phase step type resistance proportion relay control module are constituted, and the REF200 is used to generate the benchmark electricity of 100uA
Stream source, the precision operational-amplifier OPA602 are used to generate 100uA current signal to REF200 and zoom in or out,
What phase step type resistance proportion relay control module was used to control OPA602 operational amplifier zooms in or out multiple.
The double integrator voltage data sampled I CL7135 module is used to measure the self-corrosion electricity of reference electrode and Electrode
Position and the response signal after Electrode and auxiliary electrode apply excitation between acquisition reference electrode and Electrode.
13V DC power supply of the power management module by successively connecting, the 12V voltage for exporting battery are converted
It is constituted for the power circuit of 5V, -5V power circuit, 12V power circuit, -12V power circuit, the 0-100uA phase step type electric current
REF200 chip, the OPA602 chip of signaling module are connect with the 12V, -12V DC power supply, and the phase step type resistance is matched
Connect with 5V DC power supply than relay control module, microprocessor module, the double integrator voltage data sampling module with
5V, -5V DC power supply are connected.
The micro treatment module is by single-chip microcontroller STC89C54RD+, crystal oscillating circuit, reset circuit and download communication circuit group
At the microprocessor module is used to control the size of 0-100uA phase step type current signal and acquisition double integrator voltage data is adopted
The data of sample ICL7135 module, and carry out analytical calculation with this data and go out after the corrosion rate of soil to be sent to host computer display prison
Survey station.
The input of the microprocessor module is terminated with the output voltage signal for acquiring double integrator voltage data module,
The input of the microprocessor module is terminated with the module for controlling 0-100uA step current signal output size.
That the present invention also provides a kind of data processing speeds is fast, real-time performance is good, detection accuracy is high, Scalable Performance is good
Ground net corrosion state monitoring method, it is characterised in that this approach includes the following steps:
Step 1: response signal is acquired and is transmitted in real time:ICL7135 double integrator voltage data acquisition module is for acquiring ginseng
Than the potential difference V between electrode and Electrode, and 0-100uA current excitation be not added Electrode and auxiliary electrode it
Between when, record the corrosion potential V between reference electrode and Electrode0;
Step 2: 0-100uA step current pumping signal applies:Relay mould is controlled by microprocessor module every 30s
Block makes output, and current step formula is ascending becomes I1=20uA, I2=24uA, I3=30uA, I4=36uA, I5=39uA,
I6=47uA, I7=51uA, I8=56uA, I9=62uA, I10=68uA, I11=75uA, and pass through ICL7135 biproduct component voltage
Acquisition module records its corresponding response V1、V2、V3、V4、V5、V6、V7、V8、V9、V10、V1;
Step 3: signal analysis and processing:Firstly, the microprocessor module is using phase step type I as X-axis, double integrator acquisition
Circuit acquires response as Y-axis, fits its relation curve, and the optimal place of linear degree is found out on the curve being fitted,
With the optimal place coordinate (I, U) calculate polarization resistance be RP=U/I, by polarization resistance RPCorrosion current can be found out
Density Icorr=25/Rp, by corrosion current IcorrIt can obtain soil year corrosion rate V=8.56*10-3 Icorr, from which further follow that
Soil year corrosion depth is d=9.65*10-3Icorr;
Step 4: processing result shows and transmits:The microprocessor module control section is rotten by the calculated soil of institute
Erosion rate is transmitted to host computer by GPRS module and completes display, data record, alarm lamp function.
Wherein the Electrode by electrode test head, L-type pvc pipe, two signal line groups at, wherein electrode test head by
Q235 carbon steel and epoxy resin composition;Auxiliary electrode is by electrode test head, L-type pvc pipe and signal line group at wherein electrode test
Head is made of 203 stainless steels and epoxy resin;Reference electrode by copper/saturated copper sulphate solution, plastic tube and signal line group at;Three electricity
Pole passes through L-type pvc pipe respectively, and glass cement is packaged, and is fixed on double-layer scaffold, and each electrode passes through weldering with copper conductor respectively
It connects in succession, three electrode spacings immobilize, and are rearranged with delta structure, Electrode and auxiliary electrode surface is polished beats
Mill.
Present invention is generally directed to ground net corrosion states to carry out long-term, convenient, efficiently and accurately monitoring, according to electrochemistry corruption
Principle and existing monitoring technology are lost, a kind of portable sensor structure and prison based on electrochemical corrosion monitoring principle is provided
Survey method.The advantage of the monitoring system is that sensing arrangement part by similitude material, simulates grounded screen on ground well
Under corrosion process, and realize miniaturization and the distributed monitoring of sensor;In the driver unit of electrochemistry, use first
Into the other constant-current supply of step change type microampere order, electric current output size can be changed between 0-100uA by procedure auto-control, be fitted
Answer various test occasions;For the interference for avoiding live electric field and ground noise, unique double integrator voltage detection method is used,
Various noise jamming are effectively removed, the efficiency and accuracy of detection are substantially increased;All detection datas and sensor operation
State can be adjusted by host computer, realize remote automation real-time monitoring.
Compared with the prior art, the present invention has the following advantages:
1, ground net corrosion state monitoring apparatus of the present invention and method use modular circuit structure design, structure letter
It is single;By realizing the detection to soil corrosion rate, design concept novel and unique to three electrode polarization repercussion studies.
2, the present invention is this using the response between ICL7135 biproduct form-separating AD acquisition reference electrode and Electrode
The material benefit of acquisition mode price, strong antijamming capability and the sampling precision with 14 carry out calculating response voltage with integrated form,
Not only reduce the complexity of circuit element, and chip binary-coded decimal form itself export acquired data be convenient for micro process into
Row acquisition;Response acquisition range can be adjusted according to according to field condition, to further reduced testing cost.
3, the present invention is put using same chip REF200 standard 100uA mirror current source and OPA602 precision operation
Big device is used cooperatively, and is controlled resistance by relay module and is completed the output of electric current 0-100uA phase step type, electric current output accuracy compared with
It is high.
4, the present invention using low-power consumption single-chip microcontroller STC89C54RD+ carry out data processing, can not only energy conservation and environmental protection, number
Fast according to processing speed, real-time performance is good;Response signal is acquired by average value filtering algorithm, reduces detection error,
Effectively increase detection accuracy.
5, complete function of the invention, can not only be to soil corrosion rate scene real-time display, additionally it is possible to by the corrosion
Rate is transmitted to remote monitoring system to the further analysis processing of acquisition data by GPRS module.
6, not only external interference resistance is strong by the present invention, long service life, and can accurately detect the corrosion of soil
Rate.
7, Scalable Performance of the invention is good, and cost of implementation is low, practical, and using effect is good, convenient for promoting the use of.
In conclusion the present invention is novel in design, rationally easy to install and use, external interference resistance is strong, and detection accuracy is high,
Functional reliability is high, and long service life, Scalable Performance is good, and cost of implementation is low, and practical, using effect is good, convenient for promoting
It uses.
Detailed description of the invention
Fig. 1 is three electrode sensor structure charts.
Fig. 2 is constant-current source circuit schematic diagram.
Fig. 3 is double integrator voltage detecting schematic diagram.
Fig. 4 is host computer data display schematic diagram.
Fig. 5 is power management module schematic diagram.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Ground net corrosion state monitoring apparatus of the present invention, including for being assisted in polarization reaction three-electrode structure
Apply the 0-100uA step current signaling module and acquisition reference of polarization pumping signal between electrode (2) and Electrode (1)
The double integrator voltage data acquisition module of exciter response between electrode (3) and Electrode (1), and be each module for power supply of device
Power management module and to 0-100uA step current signal control, double integrator data sampling signal analyze it is obtained
The microprocessor module of soil corrosion rate.
As shown in Figure 1, the Electrode (1) manages (1-2), two signal wires by electrode test head (1-1), L-type PVC
(1-3) and (1-4) composition, wherein electrode test head (1-1) is made of Q235 carbon steel (1-1-2) and epoxy resin (1-1-1);
Auxiliary electrode (2) is made of electrode test head (2-1), L-type pvc pipe (2-2) and signal wire (2-3), wherein electrode test head (2-
1) it is made of 203 stainless steels (2-1-2) and epoxy resin (2-1-2);Reference electrode (3) is by copper/saturated copper sulphate solution (3-1), modeling
Expects pipe (3-2) and signal wire (3-3) composition.
Three electrodes pass through L-type pvc pipe respectively, are packaged with glass cement, and are fixed on double-layer scaffold (4), anti-leak-stopping
Electricity occurs.Each electrode is respectively with copper conductor by being welded to connect, and three electrode spacings immobilize, with delta structure arrangement group
At Electrode (1) and the polished polishing in auxiliary electrode (2) surface.
At embedding underground 0.6-0.8 meters of three-electrode structure, close to tested grounded screen, the conducting wire connecting with three electrodes will be
More than ground access signal source and detection circuit.
Apply 0-100uA step change type current signal between the Electrode (1) and auxiliary electrode (2), measures research
Corresponding response between electrode (1) and reference electrode (3), and it is rotten by the year that the regional soil is calculated of polar theory
Lose rate.Lead (3-3) the access biproduct parting AD acquisition of the lead (1-3) and reference electrode (3) of the Electrode (1)
In circuit, lead (1-4) and counter electrode lead (2-3) the access 0-100uA step change type current source electricity of the Electrode (1)
Road.
As shown in Fig. 2, REF200 standard 100uA current mirror source pin 1 and pin 2 are exported with -12V power supply
End connects, and REF200 standard 100uA current mirror source pin 8, pin 7 pass through terminals P 9, P10 and the essence respectively
The pin 2 of close operational amplifier OPA602 connects.
In the present embodiment, REF200 chip exports 100uA standard current signal, which accesses to OPA602 precision fortune
Amplifier pin 2 is calculated, the size by accessing resistance R between variation OPA602 pin 2 and pin 6 can be completed any than arranging
The output of size of current, REF200 electric current output pin 2 and power ground connect with auxiliary electrode (3) and Electrode (1) respectively.
Resistance R85, the precision operation amplifier are connected between the precision operational-amplifier OPA602 pin 3 and pin 6
The phase step type resistance proportion relay module and C43, phase step type resistance proportion are connected between device OPA602 pin 2 and pin 6
Each control terminal of relay control module respectively with the pin of the single-chip microcontroller STC89C54RD+ 40,41,42,43,44,1,
2,3,5,7,8,9,10,11 connect.
As shown in figure 5, the power management module by successively connect 13V DC power supply, for what battery was exported
12V voltage is converted to the power circuit of 5V, -5V power circuit, 12V power circuit, -12V power circuit and constitutes.
As shown in figure 3, in the present embodiment, ICL7135 biproduct form-separating AD Acquisition Circuit pin 10 and pin 9 respectively with ginseng
Connect than electrode 2 and Electrode 1, the ICL7135 pin 1 connects with the power module -5V.
The double integrator voltage data module I CL7135 pin 1 and pin 11 respectively with the -5V power output end, institute
It states 5V power output end to connect, the pin 9 and pin 10 of the double integrator voltage data module I CL7135 is electric with polarization three respectively
Reference electrode in the structure of pole is connected with Electrode.
The pin 13,14,15,16,17,18,19,20,23,25,26 of the double integrator voltage data module I CL7135
Connect respectively with the pin 18,19,20,21,25,24,23,22,30,31,8 of the single-chip microcontroller STC89C54RD+.
As shown in figure 4, the micro treatment module is by single-chip microcontroller STC89C54RD+, crystal oscillating circuit, reset in the present embodiment
Circuit and download communication circuit composition, 38 pins and 29 pins of the single-chip microcontroller STC89C54RD+ are electric with the 5V power supply
The output end 5V on road is connected, and the pin 16 of the single-chip microcontroller STC89C54RD+ is directly connect with power ground.
The crystal oscillating circuit is made of crystal oscillator Y1, nonpolarity capacitor C2 and C3, one end of the crystal oscillator Y1 and single-chip microcontroller
One end of the pin 14 of STC89C54RD+ and nonpolar capacitor C2 connect, the other end and single-chip microcontroller of the crystal oscillator Y1
One end of the pin 15 of STC89C54RD+ and nonpolar capacitor C3 connect, the nonpolarity capacitor C2 and nonpolar capacitor C3
Other end be grounded.
The reset circuit is made of key S1, nonpolarity capacitor C1 and resistance R9, one end of the key S1 and institute
The one end for stating the pin 4 of single-chip microcontroller STC89C54RD+, one end of resistance R9 and nonpolar capacitor C1 connects, the resistance R9's
The other end connects with the power ground, the other end of the key S1, nonpolar capacitor C1 the other end with the 5V power supply
The output end of circuit connects.
That the present invention also provides a kind of data processing speeds is fast, real-time performance is good, detection accuracy is high, Scalable Performance is good
Ground net corrosion state monitoring method, it is characterised in that this approach includes the following steps:
Step 1: response signal is acquired and is transmitted in real time:ICL7135 double integrator voltage data acquisition module is for acquiring ginseng
Than the potential difference V between electrode and Electrode, and 0-100uA current excitation be not added Electrode and auxiliary electrode it
Between when, record the corrosion potential V between reference electrode and Electrode0;
Step 2: 0-100uA step current pumping signal applies:Relay mould is controlled by microprocessor module every 30s
Block makes output, and current step formula is ascending becomes I1=20uA, I2=24uA, I3=30uA, I4=36uA, I5=39uA,
I6=47uA, I7=51uA, I8=56uA, I9=62uA, I10=68uA, I11=75uA, and pass through ICL7135 biproduct component voltage
Acquisition module records its corresponding response V1、V2、V3、V4、V5、V6、V7、V8、V9、V10、 V1;
Step 3: signal analysis and processing:Firstly, the microprocessor module is using phase step type I as X-axis, double integrator acquisition
Circuit acquires response as Y-axis, fits its relation curve, and the optimal place of linear degree is found out on the curve being fitted,
With the optimal place coordinate (I, U) calculate polarization resistance be RP=U/I, by polarization resistance RPCorrosion current can be found out
Density Icorr=25/Rp, by corrosion current IcorrIt can obtain soil year corrosion rate V=8.56*10-3 Icorr, from which further follow that
Soil year corrosion depth is d=9.65*10-3Icorr;
Step 3: processing result shows and transmits:The microprocessor module control section is rotten by the calculated soil of institute
Erosion rate is transmitted to host computer by GPRS module and completes display, data record, alarm lamp function.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (4)
1. a kind of portable ground net corrosion condition monitoring system, it is characterised in that:Including for three electrode knot of polarization reaction
The 0-100uA step current signaling module for applying polarization pumping signal in structure between Electrode (1) and auxiliary electrode (2), is adopted
Collect the double integrator voltage data acquisition module of exciter response between reference electrode (3) and Electrode (1), is that each module of device supplies
Electricity power management module, and 0-100uA step current signal is controlled, to double integrator voltage data acquire signal into
Row analysis is to obtain the microprocessor module of soil corrosion rate;
The 0-100uA step current signaling module is by REF200 standard 100uA current mirror image source, precision operational-amplifier
OPA602, phase step type resistance proportion relay control module are constituted, and the current mirror image source is used to generate the reference current of 100uA
Source, the precision operational-amplifier OPA602 for being amplified to the 100uA current signal that the current mirror image source generates or
Person reduces, and the phase step type resistance proportion relay control module is used to control zooming in or out again for OPA602 operational amplifier
Number;
The double integrator voltage data acquisition module be used to measure the corrosion potential of reference electrode (3) and Electrode (1) with
And it is acquired between reference electrode (3) and Electrode (1) after applying excitation between Electrode (1) and auxiliary electrode (2)
Response signal;
13V DC power supply of the power management module by successively connecting, the 12V voltage for exporting battery are converted to 5V
Power circuit, -5V power circuit, 12V power circuit, -12V power circuit constitute;
The REF200 chip of the 0-100uA step current signaling module, OPA602 chip with the 12V and -12V power supply
Circuit connection, the phase step type resistance proportion relay control module, microprocessor module are connect with 5V power circuit, described
Double integrator voltage data acquisition module is connected with 5V and -5V power circuit;
The microprocessor module is made of single-chip microcontroller STC89C54RD+, crystal oscillating circuit, reset circuit and download communication circuit,
The microprocessor module is used to control the size and acquisition double integrator voltage data acquisition module of 0-100uA step current signal
Data, and with this data carry out analytical calculation and go out after the corrosion rate of soil to be sent to host computer to show monitoring station;
Wherein, the Electrode (1) is by electrode test head (1-1), L-type pvc pipe (1-2), two signal wire (1-3,1-4) groups
At wherein electrode test head (1-1) is made of Q235 carbon steel (1-1-2) and epoxy resin (1-1-1);Auxiliary electrode (2) is by electricity
Pole measuring head (2-1), L-type pvc pipe (2-2) and signal wire (2-3) composition, wherein electrode test head (2-1) is by 203 stainless steels
(2-1-2) and epoxy resin (2-1-2) composition;Reference electrode (3) is by copper/saturated copper sulphate solution (3-1), plastic tube (3-2) and letter
Number line (3-3) composition;Electrode (1) and auxiliary electrode (2) are packaged by L-type pvc pipe, glass cement respectively, and fixed
On double-layer scaffold (4), each electrode is respectively with copper conductor by being welded to connect, and three electrode spacings immobilize, with isosceles triangle knot
Structure rearranges, Electrode (1) and the polished polishing in auxiliary electrode (2) surface.
2. portable ground net corrosion condition monitoring system as described in claim 1, it is characterised in that:The microprocessor mould
The input terminal of block is connect with the output voltage signal of double integrator voltage data acquisition module, the input terminal of the microprocessor module
It is further connected with the module for controlling 0-100uA step current signal output size.
3. portable ground net corrosion condition monitoring system as described in claim 1, it is characterised in that:Electrode (1) and
Double integrator voltage data acquisition module, potential difference between two electrode of real-time detection, i.e. self-corrosion electricity are accessed between reference electrode (3)
Position;0-100uA step current signaling module is accessed between Electrode (1) and auxiliary electrode (2), makes electrode that polarization occur anti-
It answers;After step micromicroampere constant current drive is added, by double integrator voltage data acquisition module, detects Electrode (1) and join
Than the polarization potential under being motivated between electrode (3);It is will test by GPRS communication as a result, including corrosion potential, constant-current source is big
Small, polarization potential is sent to host computer, by the program write by C#, obtains corrosion rate size based on fitting algorithm.
4. portable ground net corrosion condition monitoring system as described in claim 1, it is characterised in that the monitoring system
Monitoring method includes the following steps:
Step 1: response signal is acquired and is transmitted in real time:Double integrator voltage data acquisition module for acquire reference electrode (3) with
Potential difference V between Electrode (1), and 0-100uA current excitation be not added Electrode (1) and auxiliary electrode (2) it
Between when, record the corrosion potential V between reference electrode (3) and Electrode (1)0;
Step 2: 0-100uA step current signal applies:Every 30s by microprocessor module control phase step type resistance proportion after
Electrical control module, so that exporting, current step formula is ascending to become I1=20uA, I2=24uA, I3=30uA, I4=
36uA、I5=39uA, I6=47uA, I7=51uA, I8=56uA, I9=62uA, I10=68uA, I11=75uA, and pass through biproduct
Component voltage data acquisition module records its corresponding response V1、V2、V3、V4、V5、V6、V7、V8、V9、V10、V11;
Step 3: signal analysis and processing:Firstly, the microprocessor module is using step current I as X-axis, biproduct component voltage number
Response is acquired as Y-axis according to acquisition module, fits its relation curve, and find out linear degree most on the curve being fitted
Excellent place, with the optimal place coordinate (I, U) calculate polarization resistance be RP=U/I, by polarization resistance RPCorrosion electricity can be found out
Current density Icorr=25/Rp, by corrosion current IcorrIt can obtain soil year corrosion rate V=8.56*10-3Icorr, from which further follow that
Soil year corrosion depth is d=9.65*10-3Icorr;
Step 4: processing result shows and transmits:Microprocessor module control section passes through calculated soil corrosion rate
GPRS module is transmitted to host computer, completes display, data record, alarm lamp function.
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