Mechanical Load And Internal Stress Accumulation Of Insulators Under High Load Operating Conditions

High-load conditions mean that dead end insulators bears greater mechanical stress. The weight of the conductor itself and the dynamic load generated by wind vibration both act on dead end suspension insulators. These external forces cause polymer deadend insulator to experience combined stresses such as tension, compression, and bending.

porcelain dead end insulators The neck is the area of ​​highest stress concentration, and its cross-sectional dimensions differ significantly from the upper and lower parts. Under repeated mechanical stress, tiny inherent defects can propagate. Sand holes, pores, or areas with excessively large grain sizes within the ceramic component become the initiation points of cracks. These defects induce microcracks at stress concentration points, which then gradually expand under continuous load.