how no load test of a transformer is conducted?

A no-load test of a transformer is conducted to determine its core losses and impedance. The primary winding is connected to the rated voltage supply while the secondary winding is left open. The input voltage, current, and power are measured. The test is typically performed at the transformer’s rated frequency. The power measured represents the core losses, primarily due to hysteresis and eddy currents, allowing engineers to assess the transformer’s efficiency under no-load conditions.