Design of a grounding grid for a 230/69kV switchyard

A grounding system is required for a switchyard that contains two 230/69kV step down transformers and other equipments. The design of a grounding system will help with the safety of personnel and protection of equipments within the substation, if a fault were to occur in the switchyard. The design of the grounding system in this project is heavily referenced to Institute of Electrical and Electronics Engineers (IEEE) 80 Std-2000. Other standards and textbooks are also used for the design of this grounding system. Equations obtained from cited references were entered in an excel sheet for calculations. Hand calculations were also done for a second verification of solutions obtained. A third solution is provided by a computer program called WinIGS.