During maintenance, if a transformer shows anomalous leakage current, it may indicate issues with which part?

Anomalous leakage current in a transformer is most often associated with issues related to insulation. The insulation in transformers serves the critical function of preventing electrical current from unintentionally flowing to areas where it could cause damage. If the insulation is compromised due to wear, damage, or degradation, it can result in increased leakage current, indicating a potential fault. This leakage poses a risk to both the transformer itself and the surrounding equipment, as it can lead to overheating and ultimately failure if not addressed promptly.

While other components like the core, radiator, or cooling system are essential for the overall function and efficiency of the transformer, they typically do not directly relate to leakage currents in the same manner as insulation does. Issues with these components might lead to different operational problems but not specifically the anomalous leakage current that signals insulation issues. Thus, recognizing this connection is vital for effective maintenance and ensuring the safety and reliability of the transformer.