Estimation Method of Soil Ionization Critical Electric Field Strength Based on Ohm's Law

Abstract

The invention discloses a method for estimating the critical electric field strength of soil ionization based on Ohm's law. ;Set the test electrode; collect the test voltage; convert the test voltage into the electric field strength; determine the time of soil ionization according to the trough position of the function K; obtain the maximum change curve of the electric field strength in the soil according to the theoretical calculation, and then combine the accurate time of soil ionization Determine the critical electric field strength for soil ionization. The invention adopts the method of direct testing in the soil testing area, which will not damage the natural characteristics of the soil, so the measured soil critical electric field strength is completely consistent with the real situation of the soil critical electric field strength in the natural environment, and can realize high-precision measurement.

Description

Technical field [0001] The invention relates to a method for estimating the critical electric field intensity of soil ionization, in particular to a method for estimating the critical electric field intensity of soil ionization based on Ohm's law. Background technique [0002] The impulse response of the grounding system is different from the response under the power frequency current situation, when the electric field intensity in the soil around the grounding system exceeds the critical electric field intensity E c , The soil will begin to ionize, and the soil resistivity will decrease at the same time, resulting in a decrease in impact resistance. Therefore, the critical electric field intensity of soil ionization E c It is essential to evaluate the performance of the grounding system. [0003] Previous research results give a lot of information about the critical electric field strength E c The reference value and range. For example: Oettle recommends E c The value is 1MV / m, a...

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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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