Method for calculating resistivity of double-layer soil

Abstract

The invention relates to a method for calculating the resistivity of double-layer soil. The method comprises the steps of measuring the resistivity of soil by virtue of a Wenner four-electrode method,changing different positions, measuring apparent resistivities at different positions, if the average error of the measured resistivities is within 10%, considering the soil is uniform soil, and if the average error of the measured resistivities exceeds 10%, considering that the soil belongs to the double-layer soil; and supposing that the thickness of upper-layer soil in the double-layer soil iss, the specific resistance is rho1, the thickness of lower-layer soil is infinite and the specific resistance is rho2, simulating a curve changing along an electrode spacing a in excel, and adjustingparameters s, rho1 and rho2 to enable the simulated specific resistance curve to be furthest close to the specific resistance curve, so as to obtain the layering condition and parameters of the double-layer soil. According to the method, the analysis capacity of the double-layer soil can be assisted to be grasped and can be accordant with the engineering design requirements, and the method has very high practical and economic values.

Description

technical field [0001] The invention belongs to the technical field of substation infrastructure construction, and in particular relates to a calculation method for double-layer soil resistivity. Background technique [0002] Qualified low grounding resistance is crucial to the safe operation of substations, which can quickly evacuate fault currents, reduce the potential of equipment to ground, and ensure the safety of personnel and equipment in between. The capacity of the substation is huge. If the fault leakage current cannot be quickly evacuated through effective grounding, it will accumulate rapidly, causing the system to generate thousands of volts or even hundreds of thousands of volts of ground potential, resulting in equipment damage and casualties. [0003] As far as the horizontal ground grid of a large substation is concerned, as long as the resistivity analysis is accurate, the grounding resistance value uses the following formula [0004] [0005] In the fo...

AI Technical Summary

Problems solved by technology

Most people do not have the ability to analyze the resistivity of double-layer soil, so when doing grounding design, they only treat the soil as uniform soil, which will inevitably lead to major mistakes in grounding design

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