CN110514580A - The oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor - Google Patents
The oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor Download PDFInfo
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- CN110514580A CN110514580A CN201910871189.4A CN201910871189A CN110514580A CN 110514580 A CN110514580 A CN 110514580A CN 201910871189 A CN201910871189 A CN 201910871189A CN 110514580 A CN110514580 A CN 110514580A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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Abstract
The invention discloses a kind of oxygen differential concentration corrosion simulators of distribution line shaft tower down conductor, operating room and in electrode chamber filled with from distribution line shaft tower collection in worksite come soil sample, operating room and between electrode chamber pass through communicating pipe be connected to, operating room and to the top of electrode chamber inserted with gas-guide tube, gas with various is imported by gas-guide tube, embedment has working electrode in the soil sample of operating room, have embedment in the soil sample of electrode chamber to electrode, working electrode is made with to electrode of the identical material of down conductor, working electrode nearby uses a Luggin capillary to be connected to the saturated calomel electrode as reference electrode, working electrode, reference electrode and electrode is respectively connected on the corresponding binding post of electrochemical workstation.The present invention can understand the basic corrosive nature of distribution line shaft tower surrounding soil in corrosion behavior of the laboratory simulation down conductor in the soil, understand down conductor by the speed and harm of oxygen differential concentration corrosion.
Description
Technical field
The present invention relates to distribution line shaft towers.
Background technique
Distribution line is responsible for the important task to transmit electric power to user, safely and reliably runs the fast development to national economy
Normal life with the people all has extremely important effect.The failure of distribution line not only can be to the life of the people
It brings inconvenience, irredeemable loss can be also generated to national economy, therefore the safe operation of distribution line becomes power supply enterprise
The important goal of management also becomes the emphasis index of enterprise's examination.Reducing distribution line failure rate is to push power supply enterprise's technology
Progressive power is the target that power supply enterprise technical staff constantly pursues.
Distribution line generally uses overhead transmission line form in field, and distribution line shaft tower is its most important support knot
Structure, shaft tower are mainly made of steel.Due to being erected at distribution line climate condition, geographical conditions and the external environment in field
Influence it is very big, all multiple faults are frequently encountered in day-to-day operation, wherein especially maximum with the harm of thunder and lightning.Jiaxing Area is in the spring
Summer is thunder and lightning multiple period, and distribution line occurs tripping fault because of lightning stroke and happens occasionally during this period, is seriously affected
The safe operation of distribution line.
Distribution line shaft tower is connect by down conductor with the grounded screen for being embedded in underground, and grounded screen is generally connect by level
The network-like structure of body and Grounding Grids composition enhances discharge capacity to improve the contact area of grounding body and the earth.Distribution
The main function of overhead line structures earthing or grounding means is exactly that the lightning current for hitting distribution line is introduced the earth by lightning conducter, makes thunder
Electricity is reduced to minimum to harm caused by route and the person.
The anti-Lei Shuiping of enhancement line reduces lightning outage rate, and one of effective method is exactly to reduce distribution line pole
The ground resistance of tower earthing or grounding means.The ground resistance of tower grounding device is the most important thing, and ground resistance is smaller, is struck by lightning to line
Harm caused by road is just smaller.
Distribution line shaft tower is all the ground resistance of field survey after building up in strict accordance with design specification design and construction
It also is all to reach design requirement.The more long distribution line of the time limit is run, the probability by lightning stroke trip is higher, this explanation is with making
With the growth of the time limit, the ground resistance of tower grounding device has the tendency that becoming larger.The corrosion of down conductor makes earthing or grounding means
Electric conductivity reduces, and ground resistance increases.,
Down conductor generally uses steel, the zinc-plated protection in outside.Electrochemical corrosion easily occurs in the soil for metal material,
Especially in the coastal economy developed regions having a humid climate, acid rain is multiple, the corrosivity of soil is stronger.The electrochemistry of metal material is rotten
Erosion includes the homogeneous corrosion acted on by corrosion micro cell and the local corrosion acted on by corrosion macro cell.From down conductor
The phenomenon that corrosion, is observed, it is clear that is local corrosion caused by receiving macro cell corrosion.Soil ground surface due to air
It directly contacts, natural oxygen content is sufficient, as toward below ground deepening, oxygen supply is gradually insufficient, thus oxygen concentration is more next
It is smaller, until below ground 20cm, oxygen concentration tend towards stability.Therefore it will suffer from down conductor below ground 20cm to ground
The corrosion of oxygen concentration cell.
The basic corrosive nature that soil can be understood by the research of soil physical chemistry performance and electrochemical properties, passes through ground connection
The research of downlead oxygen differential concentration corrosion behavior grasps the kinetic parameter of oxygen differential concentration corrosion, establishes the model of oxygen differential concentration corrosion.So
Afterwards on this basis, it proposes to alleviate the aseptic technic that oxygen differential concentration corrosion endangers.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of oxygen concentration difference of distribution line shaft tower down conductor is rotten
Lose simulator, the oxygen differential concentration corrosion that simulation soil environment difference is constituted in underground downlead different parts.
In order to solve the above technical problems, the present invention adopts the following technical scheme: the oxygen of distribution line shaft tower down conductor
Differential concentration corrosion simulator, including electrochemical workstation, operating room, to electrode chamber, saturated calomel electrode, the operating room and right
Filled with the soil sample come from distribution line shaft tower collection in worksite, the operating room and to passing through connection between electrode chamber in electrode chamber
Pipe connection, the operating room and to the top of electrode chamber inserted with gas-guide tube, pass through gas-guide tube and import gas with various, the work
Embedment has working electrode in the soil sample of room, and being embedded in the soil sample to electrode chamber has to electrode, the working electrode and to electricity
Nearby a Luggin capillary is used to be connected to as reference electrode using the identical material production of down conductor, working electrode in pole
Saturated calomel electrode, the working electrode, reference electrode and is respectively connected on the corresponding binding post of electrochemical workstation electrode.
Optionally, the control of soil sample water content is 20%.
Optionally, the working electrode and electrode is ground through sand paper, acetone deoiling, ethyl alcohol cleaning obtains uniform
Bright and clean exposed surface.
Optionally, air is imported in operating room, N2 is imported in electrode chamber, while recording the current potential of oxygen concentration cell
Eg and oxygen concentration cell electric current ig versus time curve, and corrosion rate is measured with weight-loss method.
The present invention by adopting the above technical scheme, by the sampling to distribution line shaft tower surrounding soil, and to the soil of acquisition
The analysis and electrochemical properties measurement that sample send laboratory to carry out corresponding physicochemical property, and exist in laboratory simulation down conductor
Corrosion behavior in the soil, understand distribution line shaft tower surrounding soil basic corrosive nature, understand down conductor by
The speed and harm of oxygen differential concentration corrosion provide theoretical direction to develop targeted guard technology.
The specific technical solution of the present invention and its advantages will in the following detailed description in conjunction with attached drawing into
Row detailed description.
Detailed description of the invention
Present invention will be further described below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is the oxygen differential concentration corrosion simulator structural schematic diagram of distribution line shaft tower down conductor of the present invention；
In Fig. 1: 1- working electrode, 2- is to electrode, and the operating room 3-, 4- is to electrode chamber, 5- saturated calomel electrode, 6-
Electrochemical workstation, 7- gas-guide tube, 8- Luggin capillary；
Fig. 2 is that the current potential Eg and electric current ig of oxygen concentration cell change over time curve；
Fig. 3 is the signal polarization diagram of oxygen concentration cell effect.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
The oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor of the present invention, for simulating soil environment difference
Therefore the oxygen differential concentration corrosion that downlead different parts are constituted in underground first has to the sampling to distribution line shaft tower surrounding soil.
Local typical distribution line shaft tower is chosen, the soil sample for acquiring its two points of distance as far as possible send laboratory
It is tested.Send the moisture content of the soil sample in laboratory immediately by loss on drying measurement soil, then by soil sample air-dry, grinding,
It is spare to cross 20 meshes.
It uses soil ratio to prepare soil extract for the extraction of 5:1, leachate pHS-3C type Accurate pH meter is taken to measure
The pH value of soil, and with Cl in soil by using ion chromatography、SO4 2-And NO3The content of anion.
Other than the test of soil physico-chemical property, the electrochemical corrosion of down conductor material in the soil has also been carried out
Laboratory simulation test.Corresponding corrosion kinetics parameter is fitted by linear polarization technique and Tafel linear extrapolation method.
As shown in Figure 1, the oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor, including electrochemical workstation
6, operating room 3, to electrode chamber 4, saturated calomel electrode 5, the operating room 3 and in electrode chamber 4 filled with from distribution line pole
The soil sample that tower collection in worksite comes, the operating room 3 and to passing through communicating pipe connection, the operating room 3 and to electricity between electrode chamber 4
The top of pole room 4 imports gas with various inserted with gas-guide tube 7, by gas-guide tube 7, and embedment has work in the soil sample of the operating room 3
Make electrode 1, there is to electrode 2, the working electrode 1 and to electrode 2 using under grounding lead embedment in the soil sample to electrode chamber 4
The identical material production of line, working electrode 1 nearby use a Luggin capillary 8 to be connected to the saturated calomel electrode as reference electrode
5, the working electrode 1, reference electrode and electrode 2 is respectively connected on the corresponding binding post of electrochemical workstation 6.
In order to simulate the oxygen differential concentration corrosion that soil environment difference is constituted in underground downlead different parts, correspondingly simulating
Using two independent samples as working electrode and to electrode in test.Two electrodes are respectively placed in each operating room and to electrode chambers
Interior, two is indoor filled with the soil sample come from distribution line shaft tower collection in worksite, and soil sample water content is controlled 20% or so.
Working electrode is made with to electrode of the identical material of down conductor, is ground through No. 800 sand paper, acetone oil removing
Decontamination, ethyl alcohol cleaning, obtains uniformly bright and clean exposed surface, and total Test carries out at room temperature.
For the rule for determining oxygen concentration cell effect, air is imported in operating room, imports N in electrode chamber2, simultaneously
The current potential Eg and oxygen concentration cell electric current ig versus time curve of oxygen concentration cell are recorded, and determines corrosion with weight-loss method
Speed.
Air is imported in operating room and N is being imported to electrode chamber2The current potential E for the oxygen concentration cell recorded afterwardsgIt is dense with oxygen
The electric current i of difference batterygThe curve changed over time is as shown in Figure 2.
Fig. 2 shows the electric current i of oxygen concentration cellgIt is gradually increased, is gradually reduced after reaching peak value and tends at any time and is a certain
Stationary value.And the current potential E of oxygen concentration cellgAlso there is identical variation tendency.When each leading into sky in operating room and to electrode chamber
Gas and N2Afterwards, potential difference is produced because of the difference of oxygen concentration between two electrodes, to produce one in external circuit from work
Electrode flows to the electric current to electrode, i.e. oxygen concentration cell electric current ig.Oxygen concentration cell electric current igFrom working electrode surface flow out and from
Electrode surface is flowed into, makes to accelerate electrode surface oxidation reaction, and reduction reaction is inhibited；But make work electric on the contrary
Pole surface reduction reaction accelerates, and oxidation reaction is suppressed.igThis contribution just broken the spontaneous corrosion of original two electrode
As a result state all shows as the negative shifting of current potential, but oxidation reaction sharply makes to bear shifting more very to the current potential of electrode, this has resulted in oxygen
Bigger potential difference between concentration cell, further increases the electric current of oxygen concentration cell.With the continuation of reaction process, two electrodes
Surface is gradually stable, cell potential EgAlso it is gradually reduced and tends towards stability, correspondingly also make igReduce and it is gradually stable.As a result table
It is now maximum for the current potential of battery at peak value.
The test(ing) medium of present study is soil, and corrosion process is spread control by the oxygen of cathode reaction.With corrosion process
Progress, each reaction process of two electrode surfaces has occurred the variation of different directions, and this change procedure can pole as shown in Figure 3
Change figure illustrates.
In Fig. 3, curve 1 and 2 is respectively the oxygen reduction cathode polarization curve in anoxic and oxygen-enriched medium, and b is nature shape
Anodic polarization curves under state.Respective spontaneous corrosion electric current is respectively in anoxic and oxygen-enriched medium at this timeWithAnd
There is apparent ohmic polarization in oxygen concentration cell, makes working electrode and be respectively to the current potential of electrodeWithTwo polarization of electrode curves respectively move on to c and a, and the actual anode solution rate of two electrodes is respectively in oxygen concentration cell
WithAndMeasurement shows in oxygen concentration cell, to the pH of soil in electrode chamber in reality
Become 6.5 from 8.0 during testing；And the pH value of soil becomes 8.5 from 8.0 in operating room.This further demonstrates oxygen concentration difference electricity
The variation of different directions has occurred without chemical behavior for the electrode surface electricity of Chi Butongyangnongduqu.
From Fig. 3 it can also be seen that when oxygen concentration cell reaches stable, the electric current of oxygen concentration cell is stablized in 31.2 μ
A/cm2, compare homogeneous corrosion electric current 10.5 μ A/cm of the down conductor in the soil2, expand 1.97 times.Can therefrom it know
It road must to this since the oxygen concentration cell that various conditions are formed will cause serious accelerated corrosion to down conductor in soil
It must pay close attention.
Soil environment difference is simulated by the oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor of the present invention
The oxygen differential concentration corrosion that downlead different parts are constituted in underground, it can be deduced that such as draw a conclusion:
(1) formation of oxygen concentration cell exacerbates anoxic zone corrosion of metal process, and the mechanism of action is oxygen concentration cell
With oxygen concentration cell mechanism different directions occur for the etching dielectric layer chemistry and polarization behavior of the two poles of the earth metal surface
Variation, and then cause Kinetics of Anodic dissolution behavior that different directions and different degrees of variation occurs, show as oxygen concentration cell
Accelerated corrosion effect.
(2) by the laboratory simulation oxygen differential concentration corrosion of down conductor the result shows that, oxygen differential concentration corrosion speed is nature
2.97 times of corrosion rate, if do not paid attention to, are empirically managed down conductor, will lead to down conductor
Too fast corrosion and lead to the increase of ground resistance, so that the operation to distribution line threatens.
The oxygen differential concentration corrosion behavioral study of basic corrosive nature and down conductor from soil shows down conductor
Oxygen differential concentration corrosion speed be much larger than spontaneous corrosion speed, therefore the corrosion of down conductor with the harmfulness of oxygen differential concentration corrosion most
Greatly.
From the mechanism of oxygen differential concentration corrosion it is recognised that thoroughly to eliminate oxygen differential concentration corrosion, most effective method is to eliminate to connect
The difference of the oxygen concentration of ground downlead different zones.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, is familiar with
The those skilled in the art should be understood that the present invention includes but is not limited to content described in specific embodiment above.It is any
Modification without departing from function and structure principle of the invention is intended to be included in the range of claims.
Claims (4)
1. the oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor, it is characterised in that: including electrochemical workstation,
Operating room is adopted to electrode chamber, saturated calomel electrode, the operating room and to being filled in electrode chamber from distribution line shaft tower scene
The soil sample that collection comes, the operating room and to passing through communicating pipe connection, the operating room and the top to electrode chamber between electrode chamber
Inserted with gas-guide tube, gas with various is imported by gas-guide tube, embedment has working electrode in the soil sample of the operating room, described to electricity
There is to electrode embedment in the soil sample of pole room, the working electrode is made with to electrode of the identical material of down conductor, work
Making electrode nearby uses a Luggin capillary to be connected to the saturated calomel electrode as reference electrode, the working electrode, reference electricity
Pole and electrode is respectively connected on the corresponding binding post of electrochemical workstation.
2. the oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor according to claim 1, feature exist
In: soil sample water content is controlled 20%.
3. the oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor according to claim 1, feature exist
Electrode is ground in: the working electrode and through sand paper, acetone deoiling, ethyl alcohol cleaning obtains uniformly bright and clean exposure table
Face.
4. the oxygen differential concentration corrosion simulator of distribution line shaft tower down conductor according to claim 1, feature exist
In: air is imported in operating room, N2 is imported in electrode chamber, while recording the current potential Eg and oxygen concentration difference electricity of oxygen concentration cell
Pond electric current ig versus time curve, and corrosion rate is measured with weight-loss method.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203324149U (en) * | 2013-06-19 | 2013-12-04 | 国家电网公司 | Device capable of rapidly measuring corrosion rate of soil in different depths |
| CN206862853U (en) * | 2017-04-12 | 2018-01-09 | 国网江西省电力公司电力科学研究院 | A kind of device of open-circuit potential of the measure metal in Simulated Soil Solution |
| CN109283123A (en) * | 2018-10-25 | 2019-01-29 | 国网江西省电力有限公司电力科学研究院 | Soil accelerated corrosion tests device and experimental method |
-
2019
- 2019-09-16 CN CN201910871189.4A patent/CN110514580A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203324149U (en) * | 2013-06-19 | 2013-12-04 | 国家电网公司 | Device capable of rapidly measuring corrosion rate of soil in different depths |
| CN206862853U (en) * | 2017-04-12 | 2018-01-09 | 国网江西省电力公司电力科学研究院 | A kind of device of open-circuit potential of the measure metal in Simulated Soil Solution |
| CN109283123A (en) * | 2018-10-25 | 2019-01-29 | 国网江西省电力有限公司电力科学研究院 | Soil accelerated corrosion tests device and experimental method |
Non-Patent Citations (2)
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| 吴迪 等: "配电线路杆塔接地引下线的氧浓差腐蚀与防护技术研究", 《浙江省电力学会2018年度优秀论文集》 * |
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Application publication date: 20191129 |