Mikka Patri Hutauruk, Reza Juliangga, Hamdani. 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 . ICEEGLOF [Internet]. 2026 Feb. 13 [cited 2026 Sep. 23];:1600-13. Available from: https://proceeding.pancabudi.ac.id/index.php/ICEEGLOF/article/view/1742