Long-Time Mechanical and Electrical Strength of Suspension Insulators

Different observers have established that conventional suspension-type insulators indicate a statistical loss of strength with time. The depreciation in insulator strength is greatest in the first few months then stabilizing at value above the normal recommended working load. Various factors contribute to this loss of strength. The author's investigations have established the deterioration of component hardware coatings as one of the principal reasons for the loss in strength.