Method for designing corrosion allowance of metal grounding material in electric power system

Abstract

The invention belongs to the field of electric power systems and particularly relates to a method for designing the corrosion allowance of a metal grounding material in the electric power system, andthe problem that the previous designer determines the key parameter of the material only by checking a meter or estimating is solved when the corrosion allowance of a grounding grid is designed. The method comprises two main corrosion types of the metal material in the electric power grounding environment, namely electrochemical corrosion of soil on the metal material and electrocorrosion of powerfrequency earth current on the grounding material in the electric environment, and the method comprises a design formula for the corrosion allowance of the metal grounding material for the two corrosion types. The related method for designing the corrosion allowance is simple and feasible, and does not need massive calculation. In addition, the power current corrosion on the material, caused by the power frequency earth current, in the grinding grid is taken into consideration in the design link, the consideration does not exist in the previous grounding design, and the design method can be widely applied to power generation, power transmission and transformation and weak current control in the power industry as well as other fields requiring grounding.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a design method for corrosion allowance of metal grounding materials in the electric power system. Background technique [0002] The basic meaning of corrosion allowance in engineering design is: in the normal life period of equipment (containers, pipes, flanges, valves and pumps, etc.), the maximum allowable corrosion depth when the equipment fails due to the corrosion of the environmental medium, the power field The function of the grounding grid in the middle is to discharge current, equalize voltage, and ensure the safe operation of the power grid and electrical equipment. The failure of the grounding material will cause the grounding performance to deteriorate. A point of failure for a bad electrical connection. If there is a grounding short-circuit fault in the power system, the short-circuit current cannot be fully diffused in the soil, causing the local ...

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Problems solved by technology

[0004] The corrosion allowance can generally be determined according to the uniform corrosion rate of the metal material in the environmental medium and the design life of the material. The existing design of the corrosion allowance of the metal grounding material can only refer to the relevant design manual, and cannot be based on the actual application environment of the grounding material, Changes in corrosion factors Corrosion allowance for specific design materials

In most cases, the corrosion allowance design obtained by looking up the table is quite different from the actual application effect of the grounding material. On the one hand, it may cause the grounding grid to fail early within the design life; Oversized design results in increased material weight and thickness, resulting in unnecessary waste

With the development of power technology, the requirements for the grounding system are getting higher and higher. The current look-up table design is increasingly unsuitable for the technical development of power grounding. A method and corrosion method that can accurately characterize the corrosion of metal grounding materials is needed. Precise Calculation Method of Margin

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