Type and Service Conditions: One 3-ph, step-down transformer, with OLTC, 65°C average winding rise. Design, loading, construction, accessories & components in accordance with latest IEEE C57 Standards. Inert gas-pressure (N2) oil preservation system. Environmental Conditions: Elevation less than 1000 meters, Seismic Area: Low Design Loading Criteria: 24-hr average temperature = +30°C; peak ambient = +40°C. Ratings 12/16/20 MVA at 65°C rise, ONAN/ONAF/ONAF Connection: delta-wye; Dyn1 HV: 34,500 volts delta, 200 kV BIL LV: 12,470/7,200 volts grd-Y, 110 kV BIL Impedance (HV-LV): 7.5% at ONAN rating Tap Changers X0: 110 kV BIL winding terminal, solidly grounded De-energized Tap Changer (DETC): in HV winding, +/-2-1/2%, +/-2 steps On-load Tap Changer (OLTC), in LV winding neutral point, +/-10%, +/-16 steps; MR RMV-II-2000-15
