Optimasi Desain Sistem Pentanahan Gardu Induk dengan Model Tanah Berlapis Banyak (Studi Kasus: Gardu Induk 275 kV Nagan Raya)

Abstract

The grounding system has an important role in the operation of the substation and must be designed safely and reliably taking into account the grid conductor spacing or grid mesh size and soil type characteristics. To achieve the best level of accuracy from the grounding system, it can be done through an approach based on the actual variation of the soil characteristics at the substation called the Multilayer Soil Model. Through this modeling, it is hoped that the security level of operators in the substation area and also substation equipment will increase safety from leakage current disturbances, short circuits, lightning strikes and switching which can cause voltage abnormalities.This paper aims to examine 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 80-2013 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 12x12 meters with the highest mesh voltage value (Em) which is 985.30 Volts and the highest actual step voltage value (Es) which is equal to 308.60 Volts.