Why Do These Oil-Filled Transformers Suddenly Explode? ⚡💥🔥 Oil-cooled power transformers can turn into fireballs when something goes wrong inside. A short circuit or internal fault creates extreme heat, causing the insulating oil to vaporize almost instantly. As pressure builds, the metal tank can’t hold it—resulting in a violent explosion that sends fire and debris flying in seconds. These blasts are rare but extremely dangerous. Poor maintenance, aging insulation, faulty breakers, or overhea