Grounding system design for hv transmission substation
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Substation grounding is plays a vital role in the overall electric power system. The design of substation grounding is a challenging task. It must be properly designed to be to able disperse currents into the ground without exceeding the normal operating limits of the substation equipment, and as well ensure a safe environment for substation personnel and people around its surroundings. In this thesis, design of a proper substation grounding system is discussed as well as performing of careful analysis necessary to ensure a safe design. A typical 115/69kV transmission substation is used as an example for better understanding of the design. Relevant factors to be considered for a good substation grounding system such as soil resistivity measurements, tolerable limits calculation of current to the human body, tolerable touch and step voltages, ground potential rise(GPR), maximum fault current, grid current, total grid resistance, and benefits of surface materials will be discussed. A Windows Based Integrated Grounding System (WINIGS) design software will be used and concurrence with the IEEE Std 80-2000 to carry out the grounding design to ensure more accurate and efficient design of the substation grounding.