Running the generator with open terminals tracks the relationship between excitation current and output voltage. Short-circuit testing links field current directly to stator amperage, allowing engineers to map out core losses and calculation reactances. Transient Response Checks
: Because overheating significantly reduces insulation life—every 10°C increase beyond rated levels can cut insulation life by 50%—these parts define strict limits on temperature rise based on insulation class (e.g., Class B, F, or H).
