Which outcome occurs when an oil-filled power transformer experiences prolonged overloading?

💡 Explanation

When a transformer is overloaded for extended periods, excessive heat generation leads to accelerated thermal degradation of the insulating oil, altering its chemical composition and reducing its capacity to withstand high voltage without breakdown. Therefore accelerated oil degradation occurs, rather than core saturation, insulation cracking or tank deformation, which each require different mechanisms.

• Which risk increases when excessive creep strain accumulates in post-tensioned concrete bridge girders?
• Which outcome occurs when dissolved gas content, exceeding the saturation point, accumulates within an ultrasonic transducer's hydraulic coupler?
• Which outcome occurs when a PID temperature controller experiences integral windup in a chemical reactor's heating system?
• Which outcome arises when excessive pre-ignition occurs within an internal combustion engine cylinder?
• Which outcome reduces volumetric efficiency from over-advanced fuel injection timing in a high-performance gasoline engine?
• Which outcome occurs when thermal strain exceeds valve clearance?