Comprehensive evaluation method of erosion condition of electric transmission and transformation equipment earthing material
A technology for comprehensive evaluation of power transmission and transformation equipment, applied in the direction of analysis of materials, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve problems such as time-consuming and labor-consuming, large amount of excavation and inspection, poor pertinence, etc., and achieve test results accurate effect
Inactive Publication Date: 2013-04-24
ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER
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Problems solved by technology
This kind of maintenance according to time is poorly targeted. If unnecessary maintenance is carried out, it will cause a lot of waste of manpower and material resources.
This is because the grounding device is a concealed project buried underground, and the excavation and inspection work is huge, time-consuming and labor-intensive.
If the grounding device should be inspected and repaired due to corrosion, it will not only miss a good time to take protective measures and prolong the life of the grounding device, but also cause a major safety hazard due to the degradation of the grounding performance of the grounding device.
Method used
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Embodiment Construction
[0019] 1. Physical and chemical analysis of substation soil and test of corrosion electrochemical parameters
[0020] The inventor conducted physical and chemical analysis of the soil in the 220kV and 500kV areas of nine 500kV substations in Anhui Power Grid from 2007 to 2008, and carried out corrosion electrochemical parameter tests on site. The results are shown in Table 1 and Table 2 respectively.
[0021] Table 1 Soil physical and chemical analysis results of each sampling point
[0022]
[0023] Note: The 2 after the substation name in the table indicates the 220kV area, and the 5 indicates the 500kV area.
[0024] Table 2 Test results of electrochemical parameters of substation soil
[0025]
[0026]
[0027] Note: The 2 after the substation name in the table indicates the 220kV area, and the 5 indicates the 500kV area.
[0028] 2. Test of corrosion degree of carbon steel test piece and comparison with evaluation method of the present invention
[0029] The c...
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Abstract
The invention discloses a comprehensive evaluation method of erosion condition of an electric transmission and transformation equipment earthing material. According to the comprehensive evaluation method, when the pH value of soil in which an earthing device is buried is less than 6.8, the erosion degree of an earthing material is large; when the pH value of soil in which the earthing device is buried is greater than or equal to 6.8 and the moisture content of soil in which the earthing device is buried is greater than or equal to 35%, the erosion degree of the earthing material is small; and when the pH value of soil in which the earthing device is buried is greater than or equal to 6.8 and the moisture content of soil in which the earthing device is buried is less than 35%, and soil resistivity, reduction-oxidation potential, material corrosion potential, chloride ion content and sulfate radical content of soil in which earthing materials is buried are researched. The evaluation method provided by the invention is an on-site testing method of erosion resistance of an earthing material, a test person can know the corrosion condition of the earthing material in a short time when the test person carries a simple analytical apparatus, the evaluation method is simple and practical, and the test result is exact.
Description
1. Technical field [0001] The invention relates to a corrosion evaluation method for buried metal components, in particular to a corrosion evaluation method for grounding devices of power transmission and transformation equipment. According to the soil resistivity, soil redox potential, corrosion potential of metal materials, chloride ions and sulfate radicals in the soil where the grounding device of power transmission and transformation equipment is buried, a comprehensive evaluation method for the health status of the grounding device of power transmission and transformation equipment is established. It is suitable for corrosion evaluation of grounding devices of power transmission and transformation equipment, and the invention can also comprehensively evaluate the corrosion status of buried metal components. 2. Background technology [0002] The grounding device of power transmission and transformation equipment is the unity of working grounding, protection grounding an...
Claims
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IPC IPC(8): G01N17/00
Inventor 郑敏聪李建华聂新辉
Owner ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER
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