Contribuições ao Cálculo do Fator de Redução da Resistência de Contato do Pé no Projeto de Malha de Aterramento (Contributions to the Calculation of Reduction Factor of Contact Resistance of the Foot on Grounding Projects)

Antonio César Baleeiro Alves (abaleeiro@gmail.com)


Universidade Federal de Goiás
This paper appears in: Revista IEEE América Latina

Publication Date: March 2014
Volume: 12,   Issue: 2 
ISSN: 1548-0992


Abstract:
This paper is concerned about the calculation of reduction factor (Cs) of the ground resistance of the foot in contact with the gravel that covers the soil in substations yards, which is an essential parameter to determining the permissible touch and step voltages. It is proposed a new solution method for the equation published in ANSI/IEEE Std 80-2000 [2], from the points of view of numerical and analytical. In addition to proposing alternative procedures for calculation, this article gives a comparative analysis of different expressions of Cs found in the literature focusing on the accuracy of results and the level of complexity that each expression offers in relation to mathematical operations. Numerical results of the proposed solutions are presented.

Index Terms:
Contact resistance, Electrical safety, Electric shock, Grounding, Substation.   


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