What does resistance testing help identify in transformers?

Resistance testing in transformers is primarily used to identify the breakdown of insulators or conductors in the coils. When performing resistance tests, technicians measure the resistance across the windings of the transformer. If the resistance is significantly lower than expected, it can indicate a short circuit or deterioration of the insulation material that separates the windings, potentially leading to failures.

In transformers, the insulation between turns and layers of wire is critical to ensure that current flows in a controlled manner. Deterioration or damage to this insulation can result in short circuits, overheating, or even catastrophic failures. Therefore, resistance testing is an essential diagnostic tool in assessing the condition of transformers and ensuring operational integrity.

Other options relate to different aspects of transformer performance or alternate testing methods, but they do not directly focus on the role of resistance testing in identifying insulation or conductor issues.