Ground Resistance Estimation for a DC Converter Station: Theory versus Experiment

Samar Akef (), Ahdab M. K. El-Morshedy, Mohamed M. Samy, Ahmed M. Emam and Hadeer H. El-Hawary
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Samar Akef: Electrical Power Department, Cairo University, Cairo 12613, Egypt
Ahdab M. K. El-Morshedy: Electrical Power Department, Cairo University, Cairo 12613, Egypt
Mohamed M. Samy: Electrical Engineering Department, Beni Suef University, Beni Suef 62511, Egypt
Ahmed M. Emam: Electrical Power Department, Cairo University, Cairo 12613, Egypt
Hadeer H. El-Hawary: Physics Department, Faculty of Science, Assiut University, Assiut 71515, Egypt

Energies, 2024, vol. 17, issue 4, 1-22

Abstract: This paper is aimed at proposing a calculation model for the ground resistance of a grounding scheme servicing a high-voltage direct-current converter station. The method is based on the equivalence of current conduction and electric field from the grounding scheme through the surrounding medium. The grounding scheme is composed of three concentric ring electrodes supported by two horizontal conductors and eight vertical rods. The calculated ground resistance is 4.8 Ω against the experimental value of 5 Ω with an error of 4.2 % . The calculated ground resistance value agrees reasonably well with that of 4.7 Ω as obtained using CYMGRD software (version 7.0). The calculated surface-potential values over the ground surface agreed reasonably well with those measured experimentally, with an average deviation not exceeding 6.5 % . This study is designed to investigate how ground resistance is decreased by the increase in the scheme parameters, including the rods’ diameter and length, as well as the radius of the inner and outer rings. The dependency of the ground resistance on the soil type is also investigated.

Keywords: charge simulation technique; ground resistance; HVDC transmission line; step and touch potentials; surface potential (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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