This thesis is based on my planned grid design, using 22/0.4 kV, 1 MVA transformer for low and medium voltage consumption. The medium voltage transformer is used for basic services to step down voltage power to a lower operating voltage for home and industrial use. The switchgear I selected for my design was planned with oversizing in case there is a short circuit current in the grid. My planned grid is designed to protect our power grid while giving electricity to our homes and industries which is safe for power consumption. The worst case is the short circuit current in the power system. It is important that I plan with oversizing.