why are open-circuit tests in transformers done from the lv side?

Open-circuit tests in transformers are typically conducted from the low-voltage (LV) side to ensure safety and practicality. Testing at the LV side allows for easier handling and reduces the risk of high voltage exposure. Additionally, the LV side has lower impedance, which minimizes the impact of stray losses and ensures accurate measurement of core losses and magnetizing current, providing reliable data for transformer performance analysis.