Abnormal noise during the operation of switching power transformers can arise from various factors. Understanding these causes is essential for diagnosing issues and ensuring efficient transformer performance. Here are the primary reasons for such noises: Common Causes of Abnormal Noise 1. Overload Conditions When a transformer operates under overload, internal copper and iron losses increase, resulting in higher temperatures and reduced heat dissipation. This can lead to a dull humming sound caused by core saturation and increased magnetic flux density 2. Poor Internal Contacts Localized discharges due to poor internal contacts can generate sharp, continuous sparking noises. This issue may arise from inadequate connections within the transformer 3. Loose Components Loose internal components, such as clamps or screws, can vibrate during operation, causing clanking or o...