The Effect Of Thermal Stress On Insulator Performance Under High Load Conditions

When power equipment operates under long-term current-carrying or high-load conditions, the internal temperature rise of polymer suspension insulator brings about significant changes in the thermal stress field. The thermal gradient formed by local temperature differences intensifies the interaction between thermal expansion and contraction inside the material. This thermal behavior changes the internal stress distribution of suspension type insulator and becomes an important factor affecting its long-term operational stability. In practical applications, the cumulative heat load caused by high current density and ambient temperature variations leads to thermal reactions and physical stress accumulation within the insulation material, impacting structural integrity.

Under high load conditions, the temperature response of different parts around composite tension insulator is different, causing the internal thermal field to deviate from a uniform state. Localized heat cannot be quickly conducted to the surrounding medium, thus forming hot spots within high voltage transmission line insulators. These areas are often locations with high thermal stress values. temperature rise and differences in thermal expansion cause significantly higher thermal stress in some areas compared to surrounding areas, resulting in uneven internal stress distribution and localized mismatch. As operating time increases, the tendency for microcracks induced by thermal effects significantly increases, ultimately affecting the overall structural stability.