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Method for evaluating corrosivity of transformer station soil to galvanized steel grounding grid

An evaluation method and substation technology, applied in soil material testing, material inspection products, etc., can solve the problems of illiquidity, unevenness, and inability to evaluate soil corrosion performance in time and seasonality

Inactive Publication Date: 2015-09-09
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the soil corrosion performance cannot be evaluated due to the characteristics of soil corrosion to metals such as diversity, immobility, inhomogeneity, time seasonality and regionality, and the proposed substation soil Evaluation method for corrosiveness of galvanized steel ground grid

Method used

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  • Method for evaluating corrosivity of transformer station soil to galvanized steel grounding grid
  • Method for evaluating corrosivity of transformer station soil to galvanized steel grounding grid
  • Method for evaluating corrosivity of transformer station soil to galvanized steel grounding grid

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specific Embodiment approach 1

[0018] Specific embodiment one: the substation soil of the present embodiment is specifically prepared according to the following steps to the evaluation method of the corrosion of galvanized steel grounding grid:

[0019] Step 1, collecting soil samples along a certain diagonal line of the substation site; wherein, selecting a suitable area along the substation site without buildings, electrical equipment and solid ground;

[0020] Step 2. Perform soil physical and chemical property index detection on the soil taken out in step 1, and obtain local annual average temperature monitoring data from the Meteorological Bureau in the area where the substation is located; wherein, the physical indicators include soil type, water content and air capacity; Chemical property indicators include resistivity, pH value, soluble Cl - content, soluble SO 4 2- content and redox potential;

[0021] Step 3. Calculate the total evaluation index B according to the soil physical index, chemical ...

specific Embodiment approach 2

[0026] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: in step one, the soil samples collected along a certain diagonal line of the substation site are specifically:

[0027] (1) Select a certain diagonal line of the substation site, and dig four test pits with a diameter of 0.8-1.0m along the diagonal direction; among them, the distance between each test pit is 10m-11m, and the depth of the test pit is the same as the grounding grid of the substation. The actual buried depth is the same;

[0028] (2) Take about 2kg-2.5kg of soil samples from each test pit. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0029] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is that in step two, the soil taken out in step one is carried out for soil physical and chemical property index detection according to the "Material Soil Corrosion Test" written by the National Soil Corrosion Test Website Method", according to the correlation between the corrosion degree of galvanized steel grounding grid and the physical and chemical properties of the soil, the substation soil samples were collected, and the soil type, resistivity, pH value, water content, soluble Cl - content, soluble SO 4 2- Content, air capacity and redox potential were detected. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for evaluating the corrosivity of transformer station soil to a galvanized steel grounding grid, relates to the field of evaluation of the corrosivity to the galvanized steel grounding grid, and aims to solve the problem that as soil has various characteristics of diversity, immobility, heterogeneity, timeliness, seasonality, territoriality and the like in corrosivity to metal, evaluation to the corrosion property of soil fails. The method comprises the following steps: step I, collecting a soil sample along a certain diagonal line of a transformer station; step II, conducting soil physical and chemical property index detection on the soil sample obtained in the step I, and acquiring monitoring data of local annual mean temperature from the weather bureau of the region of the transformer station; step III, evaluating the soil sample to obtain a total evaluation index BE through calculation; step IV, evaluating the corrosivity to the galvanized steel grounding grid according to the total evaluation index BE. The method is applied to the field of evaluation of the corrosivity to the galvanized steel grounding grid.

Description

technical field [0001] The invention relates to a method for evaluating the corrosion of galvanized steel grounding grids, in particular to a method for evaluating the corrosion of substation soil to galvanized steel grounding grids. Background technique [0002] The power grounding grid is an important guarantee for the safe operation of power generation, power transformation and power transmission systems, and a necessary measure to ensure the safety of power equipment and personal safety. The grounding grid connects the points of the power system with the earth, provides a discharge channel for fault current and lightning current, stabilizes the potential, and provides a zero potential reference point. The grounding grid is a concealed project, and its design requirements are equivalent to the life of the surrounding facilities, which should generally be greater than or equal to 30 years. Since the grounding device has been in the harsh underground operating environment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 李国兴关艳玲姜子秋付丽君迟敬元
Owner STATE GRID CORP OF CHINA
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