Overcurrent and ground fault relay protection settings at tranformator-1 150kV/20kV Braga substation


  • Handoko Rusiana Iskandar Universitas Jenderal Achmad Yani
  • Herry Mulyono Universitas Jenderal Achmad Yani
  • Atik Charisma Universitas Jenderal Achmad Yani
  • Muhammad Reza Hidayat Universitas Jenderal Achmad Yani




DigSilent power factory 15.1, Braga substation, GFR, OCR


The occurrence of a malfunction at the substation results in power outages and losses in the electrical energy distribution system to consumers. Many tests are carried out to see the performance of the protection system, including the parameters of the over current relay (OCR) and ground fault relay (GFR) in the electrical energy distribution system. This research aims to analyze OCR and GFR values, analyze OCR setting, drop-off, and pick-up values, and analyze OCR time characteristics using DigSilent Power Factory 15.1 software based on existing equipment specification data at the Braga substation. The results show an OCR accuracy level of around 94% on the 20 kV and 150 kV sides. Meanwhile, 92.39% on the 20 kV GFR side and 94.87% on the 150 kV side. The setting value for the pick-up current is 0.92 A on the 20 kV side of the GFR and the drop-off current is 0.85 A on the 150 kV side with a pick-up current of 0.39 A and a drop-up current of 0.37 A. Setting a value on the 20kV side is greater than on the 150 kV side due to the difference in current transformer ratio values. The simulation results show that the OCR and GFR characteristic curves on both sides meet the criteria for a protection system with good performance.


J. P. Nascimento, N. S. D. Brito, and B. A. Souza, “An adaptive overcurrent protection system applied to distribution systems,” Comput. Electr. Eng., vol. 81, pp. 106545, 2020.

J. S. Farkhani, M. Zareein, A. Najafi, R. Melicio, and E. M. G. Rodrigues, “The power system and microgrid protection—a review,” Applied Sciences (Switzerland), vol. 10, no. 22, pp. 8271, 2020.

O. Suissa, A. Elmalech, and M. Zhitomirsky-Geffet, “Toward the optimized crowdsourcing strategy for OCR post-correction,” Aslib J. Inf. Manag., vol. 72, no. 2, pp. 179-197, 2020.

C. Plongkrathok and K. Chayakulkheeree, “Optimal Overcurrent Relay Coordination Considering Multiple Characteristic Curve for Microgrid Protection using Hybrid PSO-MILP Technique,” Int. J. Intell. Eng. Syst., vol. 15, no. 2, 2022.

A. Multi and T. Addaus, “Analisa Proteksi Over Current Relay (OCR) Dan Ground Fault Relay (GFR) Pada Transformator Daya Gardu Induk,” Sainstech J. Penelit. Dan Pengkaj. Sains Dan Teknol., vol. 32, no. 1, pp. 1–8, 2022.

E. Dermawan and D. Nugroho, “Analisa Koordinasi Over Current Relay Dan Ground Fault Relay Di Sistem Proteksi Feeder Gardu Induk 20 kV Jababeka,” J. Elektum, vol. 14, no. 2, pp. 43–48, 2017.

L. Sugesti, A. N. Afandi, and H. Putranto, “Setting Analysis of over Current Relay and Ground Fault Relay on Transformer Protection System of High Voltage Substation System,” in 2018 Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), 2018, pp. 27-31.

M. T. Pangestu, M. Jannah, R. Rosdiana, and B. Badriana, “Analisis Setting Over Current Relay Pada Penyulang Sungai Iyu Gardu Induk Tualang Cut,” J. Energi Elektr., vol. 11, no. 1, p. 17, 2022.

G. A. Ibrahmusa, Joko, T. Wrahatnolo, and A. I. Agung, “Analisis Koordinasi Setting Relay Proteksi Pada Jaringan Distribusi 20KV Penyulang Brenggolo Di PT.PLN UP3 Kediri Gardu Induk Pare,” J. Tek. Elektro, vol. 11, no. 03, pp. 507–515, 2022.

I. N. Sunaya and I. G. S. Widharma, “Analisis Koordinasi Over Current Relay Dan Ground Fault Relay Terhadap Keandalan Sistem,” J. Ilm. Vastuwidya, vol. 3, no. 1, pp. 30-40, 2020.

S. Thaha, A. W. Indrawan, and Y. J. Pongkiding, “Analisis Sistem Koordinasi Proteksi Over Current Relay (Ocr) Dan Ground Fault Relay (Gfr) Tegangan 20 Kv Bay Trafo Pada Gardu Induk Sanga-Sanga Kalimantan Timur,” J. Teknol. Elekterika, vol. 19, no. 2, pp. 116-122, 2022.

U. Djufri and F. E. Yandra, “The design programming simulation as a reference for the adjustment of the relay GFR on the protection of the airway medium voltage 20 KV,” IOP Conference Series: Materials Science and Engineering, vol. 807, no. 1, pp. 012040), 2020.

M. Madani, T. Suheta, and T. Odinanto, “Analisa Setting Over Current Relay (OCR) Dan Ground Fault Relay (GFR) Pada Trafo 60 MVA Di GIS 150 KV Simpang,” in Seminar Nasional Sains and Teknologi Terapan VII, 2019, pp. 683–690.

D. Oweka, “Optimal Generation Scheduling Approach Applied to the Transmission Grid of Uganda for Enhanced Performance and Cost Reduction,” in 2020 IEEE International Conference on Power Systems Technology (POWERCON) Optimal, 2020, pp. 1–6.

A. Hasibuan, S. Mahfudz, and M. Daud, “Network Reconfiguration of 20 kV Sample Connection Substance LG-04 Lhokseumawe City Using Digsilent Power Factory Software Simulation 15 . 1,” Int. J. Adv. Data Inf. Syst., vol. 3, no. 1, pp. 20–29, 2022.

IEEE 242, Protection and Coordination of Industrial and Commercial Power Systems, 2001st ed. New York: The Institute of Electrical and Electronics Engineers, Inc., 2001.

International Electrotechnical Commision, “Measuring relays and protection equipment-Part 1: Common requirements.,” in IEC 60255-1, International Electrotechnical Commision, 2009, pp. 1–21.