A Brief Introduction on the Causes of Overheating in Transformers
There are many reasons for excessively high transformer temperatures, which could be due to internal transformer malfunctions or external factors. One: Internal Transformer Malfunctions When a transformer operates, the temperature of each part tends to stabilize when heat generation and dissipation reach equilibrium. If, under the same conditions, the oil temperature is more than 10°C higher than usual, or the temperature continues to rise despite a constant load, it can be considered that an internal transformer malfunction has occurred. 1. Poor Tap Changer Contact During operation, insufficient contact pressure or contamination at the tap changer’s contact points can increase contact resistance. Increased contact resistance leads to increased contact temperature and overheating. This is especially true after tap changing and during transformer overload operation, where poor tap changer contact and overheating are more likely. Poor tap changer contact can be ide...