Modeling and Analysis for Calculation of Typical UHV Tower Foundation Grounding Resistance in Layered Soils

doi:10.11930/j.issn.10.11930.2015.11.82

Abstract

Abstract: Due to its large dimension and numerous vertical rods, the UHV tower foundation may penetrate a second soil layer of the horizontal layered soils. As a result, the conventional simplified method for computation of UHV tower foundation grounding resistance may cause large deviation, which can bring out uneconomic design. In order to solve this problem, the integral equation for electrostatic field is discretized in this paper carries by using MOM, which is programmed by C++ to obtain the numerical results. The grounding resistance is calculated with this algorithm for a typical UHV tower foundation, which proves the algorithm’s validation. An analysis is carried out on the relationship between the grounding resistance of UHV tower foundation and the modeling parameters of double-layer soil, which indicates that the thickness of the upper layer is the decisive factor for the grounding resistance of a typical UHV tower foundation, and when the upper soil is small in thickness, lowering the specific resistance of the lower layer is obviously effective for reducing the grounding resistance of tower foundation. It is therefore very important to accurately estimate the subsoil resistivity for the grounding calculation.

Key words: tower foundation, moment of method, compresol pile, double-layer soil, grounding resistance

CLC Number:

TM754

LIU Tongchui, PAN Wenxia, WANG Bing, DAI Min, HUANG Tao. Modeling and Analysis for Calculation of Typical UHV Tower Foundation Grounding Resistance in Layered Soils[J]. journal1, 2015, 48(11): 82-87.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.11.82

https://www.electricpower.com.cn/EN/Y2015/V48/I11/82

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