Hidayat, Arief Rahman, Agus Jamal, Anna Nur Nazilah Chamim, Ramadoni Syahputra, and Jeckson Jeckson. 2019. “Analysis of Power Transformer Insulation: A Case Study in 150 KV Bantul Substation”. Journal of Electrical Technology UMY 3 (2):50-60. https://doi.org/10.18196/jet.3254.