Mikka Patri Hutauruk, Reza Juliangga, and Hamdani. 2026. “Optimization of the Reliability Index of the 20 KV Distribution Network Through the Implementation of Routine Maintenance Without Outages Using Direct-Contact Substation PDKB at PT PLN (Persero) UP3 Pematang Siantar ”. International Conference Epicentrum of Economic Global Framework, February, 1600-1613. https://proceeding.pancabudi.ac.id/index.php/ICEEGLOF/article/view/1742.