Power station transformers, especially generator step up units, are critical for converting generator output to the high voltages used on transmission lines. Their reliability directly affects the availability of generating units and thus grid stability. They must withstand thermal cycling, short circuit stresses and transient overvoltages for decades. High efficiency reduces station losses, and robust design ensures safe operation during faults and switching events. As a result, these transformers are engineered and maintained as key assets in any power plant.