Day: دجنبر 25, 2025

Why is the Excitation Current Different Across Phases? Normal Asymmetry vs. Fault Detection

For twenty-five years, I’ve reviewed thousands of transformer excitation current test sheets. Without fail, a new engineer or technician will point to the results and ask with concern: “The middle phase reading is 30% lower than the outer two. Do we have a core fault?” My answer is almost always the same: “In a standard […]