![]() To achieve this, transformer core saturation must be ensured and current must be stable. To remove the effect of inductance (L), the change in current needs to be zero. ![]() ![]() Once required current is established, the voltage should remain constant to maintain constant current. The larger the winding (inductance), the greater the difficulty in achieving current stabilization. This rate of increase depends on winding inductance and applied voltage. While applying DC voltage to transformer winding, the current increases slowly. In this technique, the idea is to inject DC current through the winding, and measure corresponding voltage drop across the windings of the same phase after stabilization of current. Principles of Winding Resistance Measurement To identify loose connection and broken strands of conductor The table below discusses the need for measuring winding resistance in the factory and on-site: Factory test benefitsĮvaluate possible winding damage, such as open turn and inter-turn short of windingĪs a base for assessing possible damage on-siteĬheck proper functioning of the tap changer ![]()
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