Sianipar, N.A., Nurhayati, T. and Supari, S. 2025. Stability of Dielectric Insulation System in GSUT Transformer of Pertamina Geothermal Energy Lahendong: A Diagnostic Approach Based on DFR (Dielectric Frequency Response). INTERNATIONAL JOURNAL ON ADVANCED TECHNOLOGY, ENGINEERING, AND INFORMATION SYSTEM. 4, 2 (Apr. 2025), 257–266. DOI:https://doi.org/10.55047/ijateis.v4i2.1703.