why open circuit test is performed on low voltage side of transformer?

The open circuit test on the low voltage side of a transformer is performed to determine its core losses, which include hysteresis and eddy current losses. By applying rated voltage to the low voltage side while keeping the high voltage side open, we can measure the no-load current and power. This test helps in assessing the transformer’s efficiency and performance characteristics without the influence of load conditions, providing essential data for design and operational analysis.