CN105606869A - Power-transmission-line atmospheric-environment corrosion-severity rapid assessment method - Google Patents
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Abstract
The invention discloses a power-transmission-line atmospheric-environment corrosion-severity rapid assessment method. The method comprises the following steps of through an atmospheric corrosion monitor, detecting a maximum stable corrosion current of an assessed power-transmission-line atmospheric environment, and according to the maximum stable corrosion current and a preset atmosphere environment corrosion severity grade-pollutant equivalent current relation table, determining a first corrosion severity grade of the assessed power-transmission-line atmospheric environment; through the atmospheric corrosion monitor, detecting a corrosion electricity quantity of the assessed power-transmission-line atmospheric environment, and according to the corrosion electricity quantity and a preset atmosphere environment corrosion severity grade-corrosion electricity quantity relation table, determining a second corrosion severity grade of the assessed power-transmission-line atmospheric environment; selecting a result with a high grade as a final evaluation result from the first corrosion severity grade and the second corrosion severity grade and outputting. By using the method in the invention, a basis can be provided for construction, material selection and anticorrosion maintenance of a power transmission line and advantages that reliability is high, accuracy is good, the method is simple and easy to use, and detection time is short are possessed.
Description
Technical field
The present invention relates to transmission line of electricity atmospheric environment detection technique, be specifically related to one, based on Corrosion Monitor (ACM), the transmission line of electricity atmospheric environment of corrosion current and corrosion electrical measurement corroded to severity fast evaluation method.
Background technology
China is vast in territory, has various types of atmospheric corrosion environment, and the corrosion condition difference of material (metal) between different regions is very large. The region broadness that transmission line of electricity is crossed over, long term exposure, in outdoor environment, stands the invasion and attack of wind and frost sleet, and the material corrosion problems such as transmission tower, wire and gold utensil are very outstanding. Employing science, means are carried out the correctly corrosion severity to transmission line of electricity atmospheric environment of living in and are classified efficiently, and the reasonable material to transmission line of electricity and anti-corrosion measure are significant.
What adopt at present conventionally is that long-term and heavy environmental monitoring and the long term atmospheric of standard specimen are exposed to the sun test as the means of evaluating atmospheric environment corrosion severity, the etching extent being normally exposed to the sun out of doors 1 year by Steel material is assessed the grade of atmospheric environment corrosion severity of living in, due to consuming time longer, can not meet the wilderness demand of Practical Project. Therefore rapid evaluation and the classify and grading detection technique of, developing a kind of atmospheric environment corrosion severity have very real and important meaning.
Summary of the invention
The technical problem to be solved in the present invention: for the problems referred to above of prior art, provide a kind of can for the construction selection of transmission line of electricity and Corrosion Maintenance provide according to, reliability is high, accuracy good, simple and easy to do, detect short transmission line of electricity atmospheric environment corrosion severity fast evaluation method consuming time.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of transmission line of electricity atmospheric environment corrosion severity fast evaluation method, step comprises:
1) detect the maximum stable corrosion current of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine the first corrosion severity grade of evaluated transmission line of electricity atmospheric environment according to maximum stable corrosion current and default atmospheric environment corrosion severity grade-pollutant equivalent current relationship table;
2) detect the corrosion electric weight of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine that according to corrosion electric weight and default atmospheric environment corrosion severity grade-corrosion electric weight relation table second of evaluated transmission line of electricity atmospheric environment corrodes severity grade;
3) described the first corrosion severity grade and the second corrosion severity grade are compared, if the first corrosion severity grade is identical with the second corrosion severity grade, select arbitrarily one of them to export as final assessment result; Otherwise higher grade of selective etching severity result is exported as final assessment result from the first corrosion severity grade and the second corrosion severity grade.
Preferably, the detailed step of described step 1) comprises:
1.1) within continuous many days, detect respectively the maximum stable corrosion current of evaluated transmission line of electricity atmospheric environment by Corrosion MonitorI max , obtain many group maximum stable corrosion currentsI max ；
1.2) for described many group maximum stable corrosion currentsI max Be averaged and obtain maximum stable corrosion current mean valueI ave ；
1.3) use maximum stable corrosion current mean valueI ave Inquire about default atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, find the first corrosion severity grade of evaluated transmission line of electricity atmospheric environment; Described atmospheric environment corrosion severity grade-pollutant equivalent current relationship table comprises the mapping relations that comprise between maximum stable corrosion current corresponding to different corrosion severity grades.
Preferably, described step 2) detailed step comprise:
2.1) within continuous many days, detect respectively the corrosion electric weight of evaluated transmission line of electricity atmospheric environment by Corrosion MonitorQ i , obtain many group corrosion electric weightQ i ；
2.2) by described many group corrosion electric weightQ i Summation obtains many days corrosion electric weight sumsQ sum ；
2.3) by described many days corrosion electric weight sumsQ sum The total hourage that is greater than 80% divided by relative humidity RH in described many daysτ 1 , then be multiplied by the hourage that the on-site average annual relative humidity RH of transmission line of electricity is greater than 80%τ 2 , obtain the corrosion electric weight summation of a yearQ Always ；
2.4) the use corrosion electric weight summation of a yearQ Always Inquire about default atmospheric environment corrosion severity grade-corrosion electric weight relation table, find the second corrosion severity grade of evaluated transmission line of electricity atmospheric environment; Described atmospheric environment corrosion severity grade-corrosion electric weight relation table comprises the mapping relations that comprise between the different corrosion severity grade corrosion electric weight summation of corresponding a year.
Preferably, described atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, described atmospheric environment corrosion severity grade-corrosion electric weight relation table include C1～C5 totally five atmospheric environment corrosion severity grades.
Preferably, in described atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C1 is 0～1.3 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C2 is 1.3～5.6 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C3 is 5.6～15.8 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C4 is 15.8～34.7 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C5 is 34.7～86.4 μ A.
Preferably, in described atmospheric environment corrosion severity grade-corrosion electric weight relation table, corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C1 is 0～0.8Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C2 is 0.8～12.3Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C3 is 12.3～27.2Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C4 is 27.2～41.6Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C5 is 41.6～95.4Ccm2·a-1。
Preferably, the resolution ratio of described Corrosion Monitor is greater than 10-10A, measurement maximum are 10-3A。
Transmission line of electricity atmospheric environment corrosion severity fast evaluation method of the present invention has following advantage:
The present invention is directed to etching extent that prior art is exposed to the sun 1 year out of doors by Steel material and assess the defect of the existing length consuming time of grade of atmospheric environment corrosion severity of living in, consider that the etching extent of steel in atmosphere depends primarily on wetting time and pollutantSO 2 AndClThe concentration of ion, Corrosion Monitor (ACM) is exposed in atmosphere by measurementFe/CuThe electric current of galvanic corrosion galvanic cell and electric weight carry out Fast Evaluation atmospheric environment corrosion severity, based onFe/CuThe size of galvanic corrosion electric current can reaction contaminantSO 2 AndClThe impact of ion concentration, andFe/CuWhat galvanic corrosion electric weight represented is theoretical etching extent, there is certain coefficient correlation with the actual etching extent of steel, therefore detect the maximum stable corrosion current of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine the first corrosion severity grade of evaluated transmission line of electricity atmospheric environment according to maximum stable corrosion current and default atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, detect the corrosion electric weight of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine that according to corrosion electric weight and default atmospheric environment corrosion severity grade-corrosion electric weight relation table second of evaluated transmission line of electricity atmospheric environment corrodes severity grade, and in the time there are differences between the first corrosion severity grade and the second corrosion severity grade, taking the result of higher corrosion class as final assessment result, can provide foundation for construction selection and the Corrosion Maintenance of transmission line of electricity, there is reliability high, accuracy is good, simple and easy to do, detect short advantage consuming time.
Brief description of the drawings
Fig. 1 is the basic procedure schematic diagram of embodiment of the present invention method.
Detailed description of the invention
As shown in Figure 1, the step of the present embodiment transmission line of electricity atmospheric environment corrosion severity fast evaluation method comprises:
1) detect the maximum stable corrosion current of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine the first corrosion severity grade of evaluated transmission line of electricity atmospheric environment according to maximum stable corrosion current and default atmospheric environment corrosion severity grade-pollutant equivalent current relationship table;
2) detect the corrosion electric weight of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine that according to corrosion electric weight and default atmospheric environment corrosion severity grade-corrosion electric weight relation table second of evaluated transmission line of electricity atmospheric environment corrodes severity grade;
3) the first corrosion severity grade and the second corrosion severity grade are compared, if the first corrosion severity grade is identical with the second corrosion severity grade, select arbitrarily one of them to export as final assessment result; Otherwise higher grade of selective etching severity result is exported as final assessment result from the first corrosion severity grade and the second corrosion severity grade.
In the present embodiment, the resolution ratio of Corrosion Monitor is greater than 10-10A, measurement maximum are 10-3A, above-mentioned resolution ratio and range can be guaranteed the accuracy of detection of maximum stable corrosion current and corrosion electric weight, are conducive to improve the degree of accuracy of transmission line of electricity atmospheric environment corrosion severity rapid evaluation result. In addition, the present embodiment Corrosion Monitor (ACM) has the detection range of 5 ~ 6 orders of magnitude, comprisesCu/FeBipolar electrode probe. Use when Corrosion Monitor, detection is selected the rainy day as far as possible on opportunity, or air humidity larger time, avoids high temperature fine day; Detection site selects from surveyed transmission line of electricity to have screening capacity, a draughty place close to; When formal measurement, beginning is easily selected at dusk opportunity, and detecting head surface is placed vertically upward, and the cycle is 3 days.
In the present embodiment, the detailed step of step 1) comprises:
1.1) within continuous many days, detect respectively the maximum stable corrosion current of evaluated transmission line of electricity atmospheric environment by Corrosion MonitorI max , obtain many group maximum stable corrosion currentsI max ；
1.2) for many groups maximum stable corrosion currentI max Be averaged and obtain maximum stable corrosion current mean valueI ave ；
1.3) use maximum stable corrosion current mean valueI ave Inquire about default atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, find the first corrosion severity grade of evaluated transmission line of electricity atmospheric environment; Atmospheric environment corrosion severity grade-pollutant equivalent current relationship table comprises the mapping relations that comprise between maximum stable corrosion current corresponding to different corrosion severity grades.
In the present embodiment, step 2) detailed step comprise:
2.1) within continuous many days, detect respectively the corrosion electric weight of evaluated transmission line of electricity atmospheric environment by Corrosion MonitorQ i , obtain many group corrosion electric weightQ i ；
2.2) will organize corrosion electric weight moreQ i Summation obtains many days corrosion electric weight sumsQ sum ；
2.3) by many days corrosion electric weight sumsQ sum The total hourage that is greater than 80% divided by relative humidity RH in many daysτ 1 , then be multiplied by the hourage that the on-site average annual relative humidity RH of transmission line of electricity is greater than 80%τ 2 , obtain the corrosion electric weight summation of a yearQ Always ；
2.4) the use corrosion electric weight summation of a yearQ Always Inquire about default atmospheric environment corrosion severity grade-corrosion electric weight relation table, find the second corrosion severity grade of evaluated transmission line of electricity atmospheric environment; Atmospheric environment corrosion severity grade-corrosion electric weight relation table comprises the mapping relations that comprise between the different corrosion severity grade corrosion electric weight summation of corresponding a year.
In the present embodiment, atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, atmospheric environment corrosion severity grade-corrosion electric weight relation table include C1～C5 totally five atmospheric environment corrosion severity grades.
Atmospheric environment corrosion severity grade-pollutant equivalent current relationship table is specifically as shown in table 1, and pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C1 is 0～1.3 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C2 is 1.3～5.6 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C3 is 5.6～15.8 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C4 is 15.8～34.7 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C5 is 34.7～86.4 μ A.
Table 1: atmospheric environment corrosion severity grade-pollutant equivalent current relationship table.
| Atmospheric environment corrosion severity grade | C1 | C2 | C3 | C4 | C5 |
| Pollutant equivalent current threshold/10-6A | 1.3 | 5.6 | 15.8 | 34.7 | 86.4 |
In table 1, pollutant equivalent current threshold represents with the upper limit, also can adopt as required in addition interval form to represent. Table 1 is specifically according to pollutant in international standard ISO9223SO 2 AndClThe classification grade of ion, the solution of configuration respective concentration, measures the maximum stable corrosion current that Corrosion Monitor is popped one's head inI max , obtain pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C1～C5, finally obtain the corrosion of atmospheric environment shown in table 1 severity grade-pollutant equivalent current relationship table.
When site assessment transmission line of electricity atmospheric environment corrosion severity grade, the maximum stable corrosion current recording according to Corrosion Monitor in 3 daysI max Mean valueI ave Determine, according toI ave The interval situation that falls into pollutant equivalent current threshold corresponding to table 1 atmospheric environment corrosion severity grade is evaluated transmission line of electricity atmospheric environment corrosion severity grade:
◇ is when meetingI ave When≤1.3 μ A, the first corrosion severity grade is rated as C1;
◇ when meet 1.3 μ A <I ave When≤5.6 μ A, the first corrosion severity grade is rated as C2;
◇ when meet 5.6 μ A <I ave When≤15.8 μ A, the first corrosion severity grade is rated as C3;
◇ when meet 15.8 μ A <I ave When≤34.7 μ A, the first corrosion severity grade is rated as C4;
◇ when meet 34.7 μ A <I ave When≤86.4 μ A, the first corrosion severity grade is rated as C5.
Atmospheric environment corrosion severity grade-corrosion electric weight relation table is specifically as shown in table 2, and corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C1 is 0～0.8Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C2 is 0.8～12.3Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C3 is 12.3～27.2Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C4 is 27.2～41.6Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C5 is 41.6～95.4Ccm2·a-1。
Table 2: atmospheric environment corrosion severity grade-corrosion electric weight relation table.
| Atmospheric environment corrosion severity grade | C1 | C2 | C3 | C4 | C5 |
| Corrosion electric weight threshold values/Ccm2·a-1 | 0.8 | 12.3 | 27.2 | 41.6 | 95.4 |
In table 2, corrosion electric weight threshold values represents with the upper limit, also can adopt as required in addition interval form to represent. Table 2 is specifically according to 1 year corrosion depth of C1～C5 atmospheric environment corrosion severity grade steel in international standard ISO9223, the corrosion electric weight by Corrosion Monitor to in-site measurementQCarry out linear interpolation, thereby obtain the corrosion electric weight threshold values of each atmospheric environment corrosion severity grade corresponding to iso standard, finally obtain the corrosion of atmospheric environment shown in table 2 severity grade-corrosion electric weight relation table.
When site assessment transmission line of electricity atmospheric environment corrosion severity grade, the corrosion electric weight recording according to ACM in 3 daysQ i SumQ sum , divided by relative humidity RH in 3 days > and total hourage of 80%τ 1 , then be multiplied by the on-site average annual relative humidity RH of the transmission line of electricity obtaining from meteorological department > 80% hourageτ 2 , obtain the ACM corrosion electric weight summation of a yearQ Always , according toQ Always The interval situation that falls into the corresponding corrosion electric weight threshold values of the each atmospheric environment corrosion of table 2 severity grade is evaluated transmission line of electricity atmospheric environment corrosion severity grade:
◇ is when meetingQ Always ≤0.8C·cm2·a-1Time, the second corrosion severity grade is rated as C1;
◇ is when meeting 0.8Ccm2·a-1<QAlways≤12.3C·cm2·a-1Time, the second corrosion severity grade is rated as C2;
◇ is when meeting 12.3Ccm2·a-1<QAlways≤27.2C·cm2·a-1Time, the second corrosion severity grade is rated as C3;
◇ is when meeting 27.2Ccm2·a-1<QAlways≤41.6C·cm2·a-1Time, the second corrosion severity grade is rated as C4;
◇ is when meeting 41.6Ccm2·a-1<QAlways≤95.4C·cm2·a-1Time, the second corrosion severity grade is rated as C5.
The first corrosion severity grade is different with the identical also possibility of the second corrosion severity grade possibility, in the time there are differences between the first corrosion severity grade and the second corrosion severity grade, the present embodiment is taking the result of higher corrosion class as final assessment result.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. a transmission line of electricity atmospheric environment corrosion severity fast evaluation method, is characterized in that step comprises:
1) detect the maximum stable corrosion current of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine the first corrosion severity grade of evaluated transmission line of electricity atmospheric environment according to maximum stable corrosion current and default atmospheric environment corrosion severity grade-pollutant equivalent current relationship table;
2) detect the corrosion electric weight of evaluated transmission line of electricity atmospheric environment by Corrosion Monitor, determine that according to corrosion electric weight and default atmospheric environment corrosion severity grade-corrosion electric weight relation table second of evaluated transmission line of electricity atmospheric environment corrodes severity grade;
3) described the first corrosion severity grade and the second corrosion severity grade are compared, if the first corrosion severity grade is identical with the second corrosion severity grade, select arbitrarily one of them to export as final assessment result; Otherwise higher grade of selective etching severity result is exported as final assessment result from the first corrosion severity grade and the second corrosion severity grade.
2. transmission line of electricity atmospheric environment corrosion severity fast evaluation method according to claim 1, is characterized in that, the detailed step of described step 1) comprises:
1.1) within continuous many days, detect respectively the maximum stable corrosion current of evaluated transmission line of electricity atmospheric environment by Corrosion MonitorI max , obtain many group maximum stable corrosion currentsI max ；
1.2) for described many group maximum stable corrosion currentsI max Be averaged and obtain maximum stable corrosion current mean valueI ave ；
1.3) use maximum stable corrosion current mean valueI ave Inquire about default atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, find the first corrosion severity grade of evaluated transmission line of electricity atmospheric environment; Described atmospheric environment corrosion severity grade-pollutant equivalent current relationship table comprises the mapping relations that comprise between maximum stable corrosion current corresponding to different corrosion severity grades.
3. transmission line of electricity atmospheric environment according to claim 2 corrosion severity fast evaluation method, is characterized in that described step 2) detailed step comprise:
2.1) within continuous many days, detect respectively the corrosion electric weight of evaluated transmission line of electricity atmospheric environment by Corrosion MonitorQ i , obtain many group corrosion electric weightQ i ；
2.2) by described many group corrosion electric weightQ i Summation obtains many days corrosion electric weight sumsQ sum ；
2.3) by described many days corrosion electric weight sumsQ sum The total hourage that is greater than 80% divided by relative humidity RH in described many daysτ 1 , then be multiplied by the hourage that the on-site average annual relative humidity RH of transmission line of electricity is greater than 80%τ 2 , obtain the corrosion electric weight summation of a yearQ Always ；
2.4) the use corrosion electric weight summation of a yearQ Always Inquire about default atmospheric environment corrosion severity grade-corrosion electric weight relation table, find the second corrosion severity grade of evaluated transmission line of electricity atmospheric environment; Described atmospheric environment corrosion severity grade-corrosion electric weight relation table comprises the mapping relations that comprise between the different corrosion severity grade corrosion electric weight summation of corresponding a year.
4. transmission line of electricity atmospheric environment corrosion severity fast evaluation method according to claim 3, it is characterized in that, described atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, described atmospheric environment corrosion severity grade-corrosion electric weight relation table include C1～C5 totally five atmospheric environment corrosion severity grades.
5. transmission line of electricity atmospheric environment corrosion severity fast evaluation method according to claim 4, it is characterized in that, in described atmospheric environment corrosion severity grade-pollutant equivalent current relationship table, pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C1 is 0～1.3 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C2 is 1.3～5.6 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C3 is 5.6～15.8 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C4 is 15.8～34.7 μ A; Pollutant equivalent current threshold corresponding to atmospheric environment corrosion severity grade C5 is 34.7～86.4 μ A.
6. transmission line of electricity atmospheric environment corrosion severity fast evaluation method according to claim 5, it is characterized in that, in described atmospheric environment corrosion severity grade-corrosion electric weight relation table, corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C1 is 0～0.8Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C2 is 0.8～12.3Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C3 is 12.3～27.2Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C4 is 27.2～41.6Ccm2·a-1; Corrosion electric weight threshold values corresponding to atmospheric environment corrosion severity grade C5 is 41.6～95.4Ccm2·a-1。
7. according to the transmission line of electricity atmospheric environment corrosion severity fast evaluation method described in any one in claim 1～6, it is characterized in that, the resolution ratio of described Corrosion Monitor is greater than 10-10A, measurement maximum are 10-3A。
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| CN113720751A (en) * | 2021-07-21 | 2021-11-30 | 广东电网有限责任公司广州供电局 | Corrosion severity evaluation method, device, computer equipment and storage medium |
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