Grounding resistance testing method for frozen earth and snow-covered environments

Abstract

The invention discloses a grounding resistance testing method for frozen earth and snow-covered environments. The method comprises: a horizontal dual-layer soil layered model is established; a plurality of vertical grounding electrodes with proper depths are piled; a multi-channel grounding resistance measuring device is used for measuring a group of grounding resistance values Rc; resistivity values of the corresponding depths are calculated; according to a rho-l curve, whether the soil is a two-layer model is determined; if so, a soil parameter is calculated based on an equivalent calculation formula of the horizontal two-layer soil grounding resistances, on the upper soil, of the vertical grounding electrodes; whether the calculation result is reasonable is determined; and if so, the measurement value is expressed to be corrected. According to the invention, the method is suitable for various landforms and grounding grids. Increasing of the space between electrodes or frequent increasing of the grounding electrode depth can be avoided. Moreover, the measurement becomes convenient and accurate; and the work load is reduced substantially.

Description

technical field [0001] The invention relates to the field of soil grounding resistance testing, in particular to a grounding resistance testing method used in frozen soil and snow-covered environments. Background technique [0002] At present, in lightning protection and grounding projects, necessary measurements of soil resistivity and grounding resistance are required. Soil resistivity is an important basis for grounding system design, and grounding resistance is the ultimate goal of grounding system design, so these two parameters are very important. Using the current method, when measuring soil resistivity and grounding resistance, the soil is regarded as uniform soil, and the measured resistivity value is the apparent resistivity value of the soil in the area, that is, the uniform resistivity value, It does not reflect the true value of the soil. Once the properties of the upper soil change, such as snow cover, freezing, backfilling, flooding, high temperature, etc., ...

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Problems solved by technology

These technologies have the following disadvantages: when the four-pole method measures soil resistivity, the pole spacing needs to be increased, and the terrain cannot meet the requirements of the measurement pole spacing; One-time electrode depth, the measurement workload is very heavy and will bring large errors

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