Optimization Design of Grounding System Substation With Multilayer Soil Model

The grounding system has an important role in the operation of the substation. It must be designed safely and reliably, considering the grid conductor spacing or grid mesh size and soil type characteristics. The best level of accuracy from the grounding system can be achieved through an approach based on the actual variation of the soil characteristics at the substation called the Multilayer Soil Model. Through this modeling, the security level of operators in the substation area and substation equipment will increase safety from leakage current disturbances, short circuits, lightning strikes, and switching, which can cause voltage abnormalities. This paper examines the optimization and design of a substation grounding system with a Multilayer Soil Model on 275 kV Nagan Raya Substation using XGSLab software based on IEEE Std SO-2013 Standard. Based on the results of the simulations, the most optimal grounding system design for the 275 kV Nagan Raya substation is the design of a grounding system with a grid mesh size of l2xl2 meters with the highest mesh voltage value (Em) is 985.30 Volts. The highest actual step voltage value (Es) is 30S.60 Volts.