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  Why Measure Winding Resistance? Measuring winding resistance helps detect internal issues such as loose connections, damaged tap changers or shorted turns. A low or abnormal resistance signals possible problem. By testing the winding resistance you assess continuity and balance among phases. This step complements other tests such as turns-ratio checks. A transformer turns ratio tester checks ratio accuracy, and resistance measurement checks internal winding health. Understanding Transformer Windings A transformer contains primary and secondary windings wrapped on a magnetic core. Each winding is composed of many turns of conductor and has resistance. When current flows, the resistance causes voltage drop and heat. Over time connections, taps and lead wires may degrade. When you test transformer windings you evaluate this resistance under defined conditions to detect variation, imbalance or deterioration. Equipment Needed for Winding Resistance Testing Before you test transfo...