Grounding system design optimization on 275 KV betung substation based on IEEE standard 80-2000

The demand of electricity transmission toward regions for society, industrial and other needs are increasing hence, making electricity transmission and distribution increased as well. The increase in electricity transmission and distribution requires addition of Substation construction. Substation constructions are crucial for economic growth in Indonesia. This research aims to design two models of grounding system, to determine permissible touch voltages and permissible step voltages, and to simulate both designs using CYMGrd Software, whereby both designs were compared to obtain optimal grounding system at 275 KV Betung Substation. With touch voltages and step voltages values of 1387.97 V and 364.6 KV in first model, and touch voltages and step voltages of 1247.2 V and 112.39 V in second model, both model did not exceed permissible touch voltages of 1409.58 V and permissible step voltages of 5050.1 V. Final result of this research showed that second design model was more optimal compared with the first design model.