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.

• In reinforced concrete columns under compression, which mechanism causes spalling of the concrete?
• Which aerodynamic effect compromises an aircraft's stability during icing?
• Which outcome occurs more readily when forging turbine blades made from nickel superalloys at excessively high temperatures?
• Which mechanism reduces chatter during interrupted cuts on a CNC lathe using a slender workpiece?
• Which risk increases when intake air is excessively compressed by a turbocharger?
• Which outcome occurs when the concrete of a post-tensioned beam shrinks excessively?