Analysis of the Application of Fault Current Limmiter in 500 Kv System When the Entry of Power Plants in 2023-2028 to Lower Short Circuit Level at 500 KV Gitet Java Madura Bali System

Abstract

The Java Madura Bali system is the largest interconnection system in Indonesia, covering about 70% of the national electrical energy market. Electricity sales increased from 125.49 TWh in the first half of 2021 to 133.87 TWh in the first half of 2022. To maintain power balance and support energy consumption growth, additional power plants are integrated according to the RUPTL. This research aims to anticipate the increase in short circuit levels for both single-phase to ground and three-phase faults at the Extra High Voltage Substation due to new power plants, ensuring the short circuit level remains below 40 kA, in line with equipment standards. This prevents the costly replacement of 500 kV transmission system equipment. Using the Digsilent application, the study models the existing system, maps the N-1 contingency, and calculates the short circuit levels after the integration of power plants from 2023 to 2028. The results identify the type and optimal location of fault current limiters. Installing these limiters is expected to reduce the short circuit level by 5%, avoiding the need to replace transmission and substation equipment rated at 40 kA. Consequently, the 500 kV system of Java Madura Bali can operate reliably with the new power plant integrations.