MAINTENANCE AND OPERATION STUDY ON DISTRIBUTION SUBSTATION AT PT. PLN (Persero) ULP GUNUNGSITOLI. Jurnal Fisika dan Studi Pengetahuan Alam. 2026;1(1):1-10. Accessed July 31, 2026. https://ejournal.lppnusantara.com/index.php/jfsp/article/view/418