Alex Sandria Jaya Wardhana, Eko Swi Damarwan, Muhammad Al Azis Bachrun, Muhammad Luthfi Hakim
One of the most important protection elements in the power system is the Over Current Relay (OCR). This study aims to determine the differences in the characteristics of OCR in terms of theoretical based on the IEC 60255 standard compared to the results of practical trials using Relay SEPAM 1000+ T20. When the results of practical trials, current injection is carried out in the circuit. OCR characteristics that will be compared are standard inverse time, very inverse time, long inverse time, and extremely inverse time. The results showed that the average percentage difference between the calculation and theories on each OCR characteristic is less than 5%. The percentage difference in the standard inverse characteristic is 1.83%, Very inverse is 3.67%, Long time inverse is 1.57%, and extremely inverse is 4.47%. It can be concluded that there is no significant difference in OCR characteristics theoretically and practically. © (2025), (International Hellenic University School of Science and Technology). All rights reserved.
Electrical Engineering Education Dept., Universitas Negeri Yogyakarta, Indonesia; North Carolina State University, North Carolina, United States
