Open and short circuit tests are performed on a transformer to determine the: Equivalent circuit of transformer Voltage regulation of transformer Efficiency of transformerOpen Circuit Test DefinitionThe open circuit test of a transformer checks the core losses and parameters of the shunt branch by connecting instruments to the LV side and keeping the HV side open.Open-circuit Test (No-load Test) Steps: Ensure that the transformer is disconnected from the power supply to ensure safety. Open the l