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Method for evaluating corrosivity index of transformer station soil to copper grounding grid

A copper grounding grid and index evaluation technology, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of not considering the annual average ambient temperature and soil air capacity of substations, and inaccurate evaluation results, etc.

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 present invention aims to solve the problem that the existing method does not consider the influence of the two factors of the annual average ambient temperature and soil air capacity in the area where the substation is located, resulting in inaccurate evaluation results, and provides an index evaluation of the corrosion of the substation soil to the copper grounding grid method

Method used

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  • Method for evaluating corrosivity index of transformer station soil to copper grounding grid

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Experimental program
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specific Embodiment approach 1

[0016] Specific embodiment one: the substation soil of the present embodiment is characterized in that it realizes according to the following steps to the index evaluation method of copper ground grid corrosion:

[0017] 1. Collect substation soil samples;

[0018] 2. Detect the physical and chemical properties of substation soil samples;

[0019] 3. Evaluation of the corrosion performance of copper grounding grid by soil samples in substations:

[0020] According to soil type, soil resistivity, pH value, water content, soluble Cl - amount, soluble SO 4 2- According to the test results of the nine indicators of copper content, air capacity, oxidation-reduction potential and regional annual average temperature, the copper evaluation index Z i , and calculate the total evaluation index B E , the corrosion performance of soil to galvanized steel grounding grid was evaluated by soil corrosion evaluation grade.

specific Embodiment approach 2

[0021] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is that step one is specifically:

[0022] 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. The depth is the same; about 2kg to 2.5kg of soil samples are taken in each test pit.

[0023] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0024] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is that step two is specifically:

[0025] According to the "Material Soil Corrosion Test Method" compiled by the National Soil Corrosion Test Website, and according to the correlation between the corrosion degree of galvanized steel grounding grid and the physical and chemical properties of the soil, the soil samples of the substation were collected, and the soil type, soil resistivity, pH value, water content, soluble Cl - content, soluble SO 4 2- Content, air capacity and oxidation-reduction potential are detected, and the monitoring data of the regional average annual temperature are obtained from the Meteorological Bureau in the area where the substation is located.

[0026] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method for evaluating the corrosivity index of transformer station soil to a copper grounding grid, and aims to solve the problem that impact of two factors of annual mean environmental temperature and soil air capacity of the region of a transformer station are not taken into consideration, so that the evaluation result is inaccurate. The method is characterized by comprising the following steps: step I, collecting a soil sample in the transformer station; step II, conducting physical and chemical property index detection on the soil sample; step III, evaluating the corrosivity index of the soil sample to the copper grounding grid. The method is applied to the field of transformer stations.

Description

technical field [0001] The invention relates to an index evaluation method for the corrosivity of substation soil to copper 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 for a long time, the chemical corrosion and electrochemical corrosion of the soil are inevita...

Claims

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Application Information

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IPC IPC(8): G01N17/00
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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