Ohm law-based evaluation method of soil ionization critical electric field intensity

Abstract

The invention discloses an ohm law-based evaluation method of soil ionization critical electric field intensity. The evaluation method comprises following steps of selecting a to-be-tested region and measuring resistivity, dielectric constant and magnetic permeability of soil in the region; establishing an to-the-ground discharging loop; arranging a test electrode; acquiring test voltage; converting the test voltage into electric field intensity; determining ionization time of the soil according to through of the function K; and obtaining the maximum changing curve of the electric filed intensity in the soil and determining the soil ionization critical electric field intensity by combining the precise ionization time of the soil. According to the invention, by directly testing the to-be-tested region of the soil, natural features of the soil will not be damaged; the obtained soil ionization critical electric field intensity is completely the same as the soil ionization critical electric field intensity in the natural environment; and high precision measurement can be realized.

Description

technical field [0001] The invention relates to a method for estimating the critical electric field strength of soil ionization, in particular to a method for estimating the critical electric field strength for soil ionization based on Ohm's law. Background technique [0002] The impulse response of the grounding system is different from the response in the case of power frequency current, when the electric field strength in the soil around the grounding system exceeds the critical electric field strength E c , the soil will start to ionize, and at the same time the soil resistivity decreases, which in turn leads to a decrease in impact resistance. Therefore, the soil ionization critical electric field strength E c Essential for evaluating grounding system performance. [0003] Previous research results have given a lot about the critical electric field strength E c reference value and range. For example: Oettle suggests E c The value is taken as 1MV / m, which is 600-800...

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Problems solved by technology

[0005] Various existing technologies are to build experimental test circuits to obtain the critical electric field strength of soil ionization. Therefore, when the soil is only ionized in a small range or area, this type of method is difficult to find, that is to say, it must occur in the soil. The change of the electrical signal can only be obtained when there is a large degree of ionization, but at this time the electric field strength in the soil is already far greater than the actual critical electric field strength, which will lead to obvious errors

[0006] In addition, if a test circuit is built and the soil is collected and tested, it will inevitably lead to serious damage to the natural characteristics of the soil such as water content, temperature, and soil density. Therefore, even if a very accurate measurement is obtained in the test circuit, Obtain very accurate data, at this time the data is difficult to reflect the real situation of the soil critical electric field strength in the natural environment

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