Overheating is one of the most common causes of power transformer fires, often occurring as a result of insulation failure or inadequate cooling systems. When transformers are pushed beyond their limits, the resulting increase in temperature can cause components to malfunction, leading to catastrophic failures that can result in fires.

Short-circuiting is another frequent cause of power transformer fires, as electrical current is allowed to flow unchecked through the transformer’s components. This can lead to an increase in temperature and a buildup of heat, which can ultimately result in the ignition of nearby combustible materials and the onset of a fire.

Oil leakage is a third major cause of power transformer fires, as the flammable properties of transformer oil can create a serious fire hazard if it leaks or spills from the transformer. If the oil comes into contact with a source of heat or flame, it can easily ignite, leading to a potentially catastrophic fire.

Lightning strikes are a less common but still significant cause of power transformer fires, as the massive electrical currents generated by lightning strikes can cause serious damage to transformers and other electrical equipment. The resulting electrical surges and heat can cause insulation failures or component damage, which can ultimately lead to a transformer fire.