In any modern electrical system, the difference between peak performance and devastating failure often comes down to Power Quality. Unbalanced voltages are the silent, invisible threat—a persistent condition that causes overheating, massive efficiency drops, and premature failure in three-phase equipment (like motors and transformers). Most technicians detect the symptom; this document teaches you how to diagnose the root cause, understand the physics of Negative Sequence Currents, and implement data-driven solutions.