Method for measuring corrosion degree of grounding grid

Abstract

The invention relates to a method for measuring a corrosion degree of a grounding grid. The method comprises the following steps of: (1) determining various nodes of the grounding grid; (2) selectinga node arbitrarily and measuring an equivalent resistance between the node and any one of the other nodes excluding the node; (3) selecting a next node and measuring an equivalent resistance between the node and any one of the other nodes excluding the node and the selected node; (4) repeating the step (3) until a measurement of an equivalent resistance between the penultimate node and the last node is completed; (5) completing the measurement of the equivalent resistances, storing all the measured equivalent resistances, and calculating the resistance value between two adjacent nodes according to the composition of the equivalent resistances; and (6) forming a corresponding relation between the obtained resistance value and the actual detected corrosion degree and establishing a curve. According to the method for measuring the corrosion degree of the grounding grid, online monitoring of the corrosion degree of the grounding grid can be realized through a certain calculation, thereby saving a large amount of manpower and material resources.

Description

technical field [0001] The invention belongs to the technical field of detecting the corrosion degree of the grounding grid, in particular to a method for measuring the corrosion degree of the grounding grid. Background technique [0002] As an important component for discharging fault current and lightning current, the grounding grid plays a key role in the safe operation of the power system. The resistance of the grounding grid determines the capacity of the grounding system to discharge fault current. When the resistance of the grounding grid increases due to corrosion, it can cause the breakdown of the equipment insulation, which may lead to malfunction or refusal of monitoring or control equipment, or damage the equipment and expand the accident. Moreover, at present, flat steel or galvanized steel is generally used as the grounding grid material of substations in my country. It is buried underground all the year round. Due to many reasons such as chemical corrosion, el...

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Problems solved by technology

When the resistance of the grounding grid increases due to corrosion, it can cause the breakdown of the equipment insulation, which may cause malfunction or refusal of the monitoring or control equipment, or damage the equipment and expand the accident.

Moreover, at present, flat steel or galvanized steel is generally used as the grounding grid material of substations in my country. It is buried underground all the year round. Due to many reasons such as chemical corrosion, electrochemical corrosion, and microbial corrosion, corrosion is more likely to occur, which makes the safe operation of the power grid potentially affected. Therefore, it is particularly important to judge and monitor the corrosion degree of the grounding grid

Considering that the grounding grids are all buried in the soil layer of a few meters underground, if all of them are taken out to observe with the naked eye or other chemical analysis methods are used to analyze the degree of corrosion, it will be a lot of labor, and exposure to the air will also aggravate its corrosion to a certain extent

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