Final answer:
The question is about the allowable hotspot temperature for transformer overloading considering the normal life loss, which is a physics concept related to electrical power and engineering.
Step-by-step explanation:
The student has asked about the hotspot temperature allowed for overloading a transformer, taking into account the normal one-day loss of life for the transformer. This question pertains to the thermal effects of electrical power and is deeply rooted in the concepts of physics, specifically electrical engineering. When a transformer operates at a load that causes a hotspot temperature to rise, the insulation's longevity is affected. To maintain a normal life expectancy for the transformer, the temperature must be managed so it does not exceed the threshold that causes accelerated aging of the insulation material.
Safety regulations typically limit the continuous current that a transformer can handle to prevent overheating. For instance, continuous use may be limited to 80% of a circuit breaker's capacity to prevent unsafe conditions. This also applies to the wiring within appliances and buildings, where excessive current can lead to overheating and potentially hazardous situations.
Therefore, the hotspot temperature corresponding to the allowed overloading during the remaining part of the day would need to be set at a level that does not cause additional degradation to the transformer's expected lifespan. Manufacturers of transformers normally provide these limits based on extensive testing and modeling of the heating effects and insulation material properties.