![]() ![]() Regardless of the configuration, the resistance measurements are normally made phase-to-phase and the readings are compared with each other to determine if they are acceptable. Winding resistance in transformers will change due to shorted turns, loose connections, or deteriorating contacts in tap changers. Measuring the resistance of transformer windings assures that each circuit is wired properly and that all connections are tight. The main purpose of this test is to check for gross differences between windings and for opens in the connections. Winding resistance measurements are an important diagnostic tool for assessing possible damage to transformers resulting from poor design, assembly, handling, unfavorable environments, overloading or poor maintenance. ![]() This guide provides an introduction to transformer winding resistance test methods and procedures. ![]()
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