A design method for corrosion allowance of metal grounding materials in power systems
A technology of metal grounding and metal materials, applied in the field of power systems, can solve problems such as waste, inadaptability to power grounding, grounding grid failure, etc., and achieve the effect of reducing the cost of use and the design method is simple and easy
Active Publication Date: 2020-10-02
STATE GRID CORP OF CHINA +1
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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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[0067] The method of the invention is used to carry out grading research on the corrosion rate of steel materials in the Liaoning area, and the soil index data required for the grading comes from the field test results of the soil in the Liaoning area. Such as figure 1 As shown, from the soil corrosion classification diagram of steel grounding materials in Liaoning area, it can be seen that the corrosion classification in Shenyang area is medium corrosion, and the electrochemical corrosion rate takes the maximum value Ve=0.2mm / a. The relationship between the power frequency ground current and the current density of carbon steel materials is:
[0068] Vc=ln(0.98+0.0065I)
[0069] If the power frequency maximum grounding current I of the substation grounding grid is 20mA / m 2 , a=0.98, b=0.0065, using the above formula to calculate the corrosion rate of power frequency into the ground current is 0.105mm / a.
[0070] Taking the service life of the grounding material as 20 years,...
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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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IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 刘靖波史哲刘冰杨晓东于兴成张平肖雪李帅宁辽逸刘金源张如玉李革林剑峰王镝修策张爽莹任兆龙刘晓光李建华吴学锋潘进雷雨徐强胜鞠颂
Owner STATE GRID CORP OF CHINA