Publication Date: 2021/10/02
Abstract: Due to the increase in the demand for electrical power which necessitated an expansion of the existing power system call for an improved design and evaluation of electrical earthing system of the existing transmission grid. In this paper, the earthing grid mesh design and improvement of the 132/33 kV Maryland transmission station was carried out. IEEE and finite element methods were used to generate the required grid mesh structure performance parameters. The soil resistivity was measured using the wenner four-point method and gotten to be 235Ωm. ETAP software (19.0) was used to model, analyze, and simulate the data generated. The result obtained from the simulation of the existing grid showed that the maximum touch voltage using the IEEE and finite element method were 3781.7V and 3766.7V respectively higher than the tolerable touch voltage, 1581.7V. The existing design was improved by adjusting the number of rods, number of parallel conductors, diameter of ground rods and depth of ground rods. The results from the improved design showed that the maximum touch voltage of IEEE (1580.3V) and FEM (1345.8V) were lower than the tolerable touch voltage 1581.7V. Also the improved ground resistance using the IEEE (0.650Ω) and FEM (0.649Ω) were lower than that of the existing IEEE (1.626Ω) and FEM (0.777Ω) designs. The comparison of the result from the improved methods showed that the touch voltage (1345.8V), ground potential rise (10712.3V) and ground resistance (0.649Ω) of the FEM were lower than the touch voltage (1580.3V), ground potential rise (10716.1V) and ground resistance (0.65Ω) of the IEEE. It then implies that using the improved FEM designs, personnel and equipment safety is highly guaranteed Which transmit into a reliable power system to the citizenry.
Keywords: No Keywords Available
DOI: No DOI Available
PDF: https://ijirst.demo4.arinfotech.co/assets/upload/files/IJISRT21SEP193.pdf
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