Transformer testing is a vital practice in maintaining and ensuring the reliability of electrical power systems. Two fundamental tests, Transformer Turns Ratio (TTR) testing and winding resistance testing, provide essential data on the health and integrity of transformer windings, core condition, and overall functionality. In this article, we will explore the technical aspects of these tests, their importance, and the role advanced instruments like the Megger TTRU1 (fig 1), TTRU3 (fig 2), and TAU3 (fig 3) testers play in field applications.
