Hidayat, A.R., Jamal, A., Chamim, A.N.N., Syahputra, R. and Jeckson, J. 2019. Analysis of Power Transformer Insulation: A Case Study in 150 kV Bantul Substation. Journal of Electrical Technology UMY. 3, 2 (Jun. 2019), 50–60. DOI:https://doi.org/10.18196/jet.3254.