Overcurrent relays have a significant impact on the continuity of the electrical system in the industry. Its fast, sensitive, and selective function allows this relay to minimize continuous disturbances. In other words, overcurrent relays limit disturbances to the affected area only. To get a more reliable protection system, it is necessary to have protection coordination that connects one relay to another. An important thing that must be considered in protection coordination, especially in overcurrent relays, is filling in the TDS parameter (Time Dial Setting). TDS regulates the operating time of the relay in securing a disturbance. Generally, the TDS value is determined using manual calculations to get the minimum TDS value. To get precise and accurate TDS results, this research will use a special algorithm, analysis by Adaptive Modified Firefly Algorithm (AMFA) Method. In this research, a blackout case study was used at an oil company in Indonesia which resulted in production stopping because the protection system was deemed to have failed to isolate the fault point. For calculations with the AMFA method will be carried out using MATLAB software and for validation using ETAP software.