what is the main purpose of doing open circuit and short circuit test of transformers?

The main purpose of conducting open circuit and short circuit tests on transformers is to determine their efficiency and performance characteristics. The open circuit test assesses the core losses and no-load current by measuring voltage, current, and power when the secondary winding is open. Conversely, the short circuit test evaluates copper losses and full-load current by shorting the secondary winding and measuring the input voltage, current, and power. Together, these tests provide essential data for transformer design and operation.