Construction of grounding system

The construction of a grounding system is very important while designing of grounding system for high voltage substation. One of tasks of the grounding systems is to maintain the voltage rise due to discharging fault current into grounding grids at the minimum value to ensure the safety of public and personnel. Grounding is the permanent and intentional connection of all metal parts of an electrical power system to the earth with a conductor that has a sufficient current rating to carry any possible fault current and sufficiently low impedance to limit the voltage rise above the ground potential. Under normal conditions, electrical system will satisfactorily deliver power without proper grounding. Grounding problems will become apparent only after a fault occurs and someone is injured or equipment is damaged. The construction of a grounding system will depend on a number of factors, such as size of a grid, type of soil, size of conductor, depth of burial, availability of equipment, cost of labor, and any physical or safety restrictions due to nearby existing structures or energized equipment. This study will briefly explain trench method and conductor plowing method for construction of a grounding system.