Analysis of Leakage Current Calculation Through Thermal Failure Voltage on 150/20 kV Transformers in GIS Simpang, Surabaya. elementer [Internet]. 30 November 2024 [dikutip 20 September 2026];10(2):97-104. Tersedia pada: http://ns1.pelatihan-osn.com/index.php/elementer/article/view/6366