Abstract
Grounding electrodes are used to ensure safe operation of electrical apparatus. The limited axial construction space for grounding electrodes is a significant constraining factor. Grounding performance will attenuate rapidly under the influence of the reduced length of horizontal or vertical grounding electrodes. However, if additional resistance-reducing measures are adopted, the operation and maintenance cost of grounding electrodes will considerably increase. To solve above problem, this study proposed a novel grounding model that uses a helical grounding electrode to improve grounding performance within limited axial construction space. Firstly, a calculation model of finite element methods (FEM) is built based on the concept of increasing the contact area between the grounding electrodes and the soil. Grounding performance parameters of helical grounding electrodes, grounding resistance, electrical potential rise (EPR) distribution and maximum touch voltage, are analyzed. At the same time, structural parameters and buried depth for the helical grounding electrodes are studied and the optimal design criteria for the parameters are given. Results show that the helical grounding electrode exhibits better grounding performance in a limited axial construction area.
Highlights
A grounding system is an important component of a power system, and it ensures the safe operation of most electrical equipment
This study proposes that the helical grounding model cangrounding avoid the disadvantages of can avoid theofdisadvantages of horizontal andproposes vertical grounding electrodes byelectrode increasing thecan contact field electrical engineering
Grounding device means helical grounding electrodes or any grounding electrode of another form. This model is built on the basis of finite element method (FEM), where Γ1 is the interface between the soil medium and air, Γ2 is the interface between the grounding device surface and the soil medium, Γ3 is the interface between the soil and mapping area, Γ4 is the equivalent boundary of the simulating zero potential at infinity, Ω1 is soil area, Ω2 is mapping area, and Ω3 is air area
Summary
A grounding system is an important component of a power system, and it ensures the safe operation of most electrical equipment. Yuan Tao et al proposed an between effective soil and grounding resistance [8]. A novel grounding electrode electrode model is proposed—helical grounding electrodes—and it can improve the grounding model is proposed—helical it can improve the grounding performance of performance of groundinggrounding electrodeselectrodes—and within a limited axial construction space. A finite grounding electrodes within a limited axial space. Distribution, maximum touch voltage, and were other compared parametersand of horizontal and otherpotential parameters of horizontal and helical grounding electrodes analyzed and helical grounding electrodes were compared and analyzed using the finite element method (FEM). The grounding performance of helical grounding electrodes with different buried depths, electrodes with different buried depths, radius and axial pitches were analyzed. Design ofTothe helical grounding electrode structure in the optimum grounding electrode structure in the optimum axial space unit was applied.
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