1000 kVA, 11 kV/ 433V Copper Wound (OUTDOOR TYPE) Transformer as per IS 1180 (Part 1): 2014, Energy Efficiency Level-I (As per Amendment no. 4 ) With OLTC, The maximum losses (No load losses + Full load losses) at 50% loading in watts at 75 degree celsius - 1860W, The maximum losses (No load losses + Full load losses) at 100% loading in watts at 75 degree celsius - 5300 W, Impedance at 75 deg. C on principal tap - 4.5%