1) This document outlines procedures for experiments involving three-phase transformers to determine their equivalent circuit, voltage regulation, efficiency, and harmonic generation. Safety precautions for high voltages are provided. 2) Single-phase transformers will be tested under open circuit and short circuit conditions to calculate the equivalent circuit. Load tests will measure voltage regulation and efficiency. 3) Using three similar single-phase transformers, a three-phase connection with delta primary and wye secondary will be tested under varying loads to evaluate voltage regulation and efficiency.