High-voltage line post insulator is a kind of steel insulator composed of one or more insulating parts permanently glued on the metal base, and sometimes a cap, and can be used on the metal base stud bolt or one or Several bolts are rigidly mounted on the support structure. For nominal voltage higher than 1000V, frequency not higher than 100Hz, altitude not higher than 1000m, used for insulation and supporting wires in AC power lines in ordinary areas and medium and heavy pollution areas, the ambient temperature of the installation site is -40℃~+ Between 40℃.
High-voltage line (solid) column insulators can replace pin insulators. Pin insulators are type B insulators, which are prone to breakdown and damage during operation. Tempered glass insulators will self-destruct at this time, while porcelain insulators will not. Therefore, the electrical industry department needs to spend a lot of manpower and material resources to conduct electrical testing and preventive tests on porcelain insulators, which has certain deficiencies in economic and safe power supply. Therefore, with the development of manufacturing technology, the emergence of line (solid) post insulators. These insulators all have solid insulators and are type A insulators, so there is no need to worry about breakdown along the inside of the insulator during operation, which is a major advantage.
High-voltage line column-type porcelain insulators are divided into eight grades of 95, 105, 125, 150, 170, 200, 250 and 325kV according to the rated lightning impulse withstand voltage value; they are divided into 3, 5, 8 and 12.5 according to the rated bending failure load value kN four grades; according to its installation method, it is divided into two types: vertical installation and horizontal installation; according to its connection with high-voltage conductors, it is divided into two types: top binding type and top wire clamp type; according to the connection method of steel feet and base Separate type (thread connection) and non-separable type.