The Temperature Relationship Between Insulator Thermal Stress And Life Degradation

The thermal load that high voltage transmission line insulators experiences during long-term current-carrying operation directly affects its aging process and service life. The thermal aging of overhead power line insulators follows a similar Arrhenius thermodynamic law; temperature changes significantly accelerate the internal chemical reaction rate, thereby exacerbating dielectric degradation.

When the operating ambient temperature of tension insulator rises by approximately 10°C, the thermal life of its internal insulation system decreases to roughly 50% of its original value, meaning that the aging rate of dead end insulators exposed to higher temperatures will increase exponentially. This law stems from the characteristic that the thermal reactivity rate of material molecules increases exponentially with temperature, belonging to the generally accepted engineering "thermal life curve" model.